Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 6265 insertions, 0 deletions

diff --git a/src/VBox/Runtime/common/dbg/dbgmoddwarf.cpp b/src/VBox/Runtime/common/dbg/dbgmoddwarf.cpp
new file mode 100644
index 00000000..a147b719
--- /dev/null
+++ b/src/VBox/Runtime/common/dbg/dbgmoddwarf.cpp
@@ -0,0 +1,6265 @@
+/* $Id: dbgmoddwarf.cpp $ */
+/** @file
+ * IPRT - Debug Info Reader For DWARF.
+ */
+
+/*
+ * Copyright (C) 2011-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP   RTLOGGROUP_DBG_DWARF
+#include <iprt/dbg.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/ctype.h>
+#include <iprt/err.h>
+#include <iprt/list.h>
+#include <iprt/log.h>
+#include <iprt/mem.h>
+#define RTDBGMODDWARF_WITH_MEM_CACHE
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+# include <iprt/memcache.h>
+#endif
+#include <iprt/path.h>
+#include <iprt/string.h>
+#include <iprt/strcache.h>
+#include <iprt/x86.h>
+#include <iprt/formats/dwarf.h>
+#include "internal/dbgmod.h"
+
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/** Pointer to a DWARF section reader. */
+typedef struct RTDWARFCURSOR *PRTDWARFCURSOR;
+/** Pointer to an attribute descriptor. */
+typedef struct RTDWARFATTRDESC const *PCRTDWARFATTRDESC;
+/** Pointer to a DIE. */
+typedef struct RTDWARFDIE *PRTDWARFDIE;
+/** Pointer to a const DIE. */
+typedef struct RTDWARFDIE const *PCRTDWARFDIE;
+
+/**
+ * DWARF sections.
+ */
+typedef enum krtDbgModDwarfSect
+{
+    krtDbgModDwarfSect_abbrev = 0,
+    krtDbgModDwarfSect_aranges,
+    krtDbgModDwarfSect_frame,
+    krtDbgModDwarfSect_info,
+    krtDbgModDwarfSect_inlined,
+    krtDbgModDwarfSect_line,
+    krtDbgModDwarfSect_loc,
+    krtDbgModDwarfSect_macinfo,
+    krtDbgModDwarfSect_pubnames,
+    krtDbgModDwarfSect_pubtypes,
+    krtDbgModDwarfSect_ranges,
+    krtDbgModDwarfSect_str,
+    krtDbgModDwarfSect_types,
+    /** End of valid parts (exclusive). */
+    krtDbgModDwarfSect_End
+} krtDbgModDwarfSect;
+
+/**
+ * Abbreviation cache entry.
+ */
+typedef struct RTDWARFABBREV
+{
+    /** Whether there are children or not. */
+    bool                fChildren;
+#ifdef LOG_ENABLED
+    uint8_t             cbHdr; /**< For calcing ABGOFF matching dwarfdump. */
+#endif
+    /** The tag. */
+    uint16_t            uTag;
+    /** Offset into the abbrev section of the specification pairs. */
+    uint32_t            offSpec;
+    /** The abbreviation table offset this is entry is valid for.
+     * UINT32_MAX if not valid. */
+    uint32_t            offAbbrev;
+} RTDWARFABBREV;
+/** Pointer to an abbreviation cache entry. */
+typedef RTDWARFABBREV *PRTDWARFABBREV;
+/** Pointer to a const abbreviation cache entry. */
+typedef RTDWARFABBREV const *PCRTDWARFABBREV;
+
+/**
+ * Structure for gathering segment info.
+ */
+typedef struct RTDBGDWARFSEG
+{
+    /** The highest offset in the segment. */
+    uint64_t            offHighest;
+    /** Calculated base address. */
+    uint64_t            uBaseAddr;
+    /** Estimated The segment size. */
+    uint64_t            cbSegment;
+    /** Segment number (RTLDRSEG::Sel16bit). */
+    RTSEL               uSegment;
+} RTDBGDWARFSEG;
+/** Pointer to segment info. */
+typedef RTDBGDWARFSEG *PRTDBGDWARFSEG;
+
+
+/**
+ * The instance data of the DWARF reader.
+ */
+typedef struct RTDBGMODDWARF
+{
+    /** The debug container containing doing the real work. */
+    RTDBGMOD                hCnt;
+    /** The image module (no reference). */
+    PRTDBGMODINT            pImgMod;
+    /** The debug info module (no reference). */
+    PRTDBGMODINT            pDbgInfoMod;
+    /** Nested image module (with reference ofc). */
+    PRTDBGMODINT            pNestedMod;
+
+    /** DWARF debug info sections. */
+    struct
+    {
+        /** The file offset of the part. */
+        RTFOFF              offFile;
+        /** The size of the part. */
+        size_t              cb;
+        /** The memory mapping of the part. */
+        void const         *pv;
+        /** Set if present. */
+        bool                fPresent;
+        /** The debug info ordinal number in the image file. */
+        uint32_t            iDbgInfo;
+    } aSections[krtDbgModDwarfSect_End];
+
+    /** The offset into the abbreviation section of the current cache. */
+    uint32_t                offCachedAbbrev;
+    /** The number of cached abbreviations we've allocated space for. */
+    uint32_t                cCachedAbbrevsAlloced;
+    /** Array of cached abbreviations, indexed by code. */
+    PRTDWARFABBREV          paCachedAbbrevs;
+    /** Used by rtDwarfAbbrev_Lookup when the result is uncachable. */
+    RTDWARFABBREV           LookupAbbrev;
+
+    /** The list of compilation units (RTDWARFDIE). */
+    RTLISTANCHOR            CompileUnitList;
+
+    /** Set if we have to use link addresses because the module does not have
+     *  fixups (mach_kernel). */
+    bool                    fUseLinkAddress;
+    /** This is set to -1 if we're doing everything in one pass.
+     * Otherwise it's 1 or 2:
+     *      - In pass 1, we collect segment info.
+     *      - In pass 2, we add debug info to the container.
+     * The two pass parsing is necessary for watcom generated symbol files as
+     * these contains no information about the code and data segments in the
+     * image.  So we have to figure out some approximate stuff based on the
+     * segments and offsets we encounter in the debug info. */
+    int8_t                  iWatcomPass;
+    /** Segment index hint. */
+    uint16_t                iSegHint;
+    /** The number of segments in paSegs.
+     * (During segment copying, this is abused to count useful segments.) */
+    uint32_t                cSegs;
+    /** Pointer to segments if iWatcomPass isn't -1. */
+    PRTDBGDWARFSEG          paSegs;
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+    /** DIE allocators. */
+    struct
+    {
+        RTMEMCACHE          hMemCache;
+        uint32_t            cbMax;
+    } aDieAllocators[2];
+#endif
+} RTDBGMODDWARF;
+/** Pointer to instance data of the DWARF reader. */
+typedef RTDBGMODDWARF *PRTDBGMODDWARF;
+
+/**
+ * DWARF cursor for reading byte data.
+ */
+typedef struct RTDWARFCURSOR
+{
+    /** The current position. */
+    uint8_t const          *pb;
+    /** The number of bytes left to read. */
+    size_t                  cbLeft;
+    /** The number of bytes left to read in the current unit. */
+    size_t                  cbUnitLeft;
+    /** The DWARF debug info reader instance.  (Can be NULL for eh_frame.) */
+    PRTDBGMODDWARF          pDwarfMod;
+    /** Set if this is 64-bit DWARF, clear if 32-bit. */
+    bool                    f64bitDwarf;
+    /** Set if the format endian is native, clear if endian needs to be
+     * inverted. */
+    bool                    fNativEndian;
+    /** The size of a native address. */
+    uint8_t                 cbNativeAddr;
+    /** The cursor status code.  This is VINF_SUCCESS until some error
+     *  occurs. */
+    int                     rc;
+    /** The start of the area covered by the cursor.
+     * Used for repositioning the cursor relative to the start of a section. */
+    uint8_t const          *pbStart;
+    /** The section. */
+    krtDbgModDwarfSect      enmSect;
+} RTDWARFCURSOR;
+
+
+/**
+ * DWARF line number program state.
+ */
+typedef struct RTDWARFLINESTATE
+{
+    /** Virtual Line Number Machine Registers. */
+    struct
+    {
+        uint64_t        uAddress;
+        uint64_t        idxOp;
+        uint32_t        iFile;
+        uint32_t        uLine;
+        uint32_t        uColumn;
+        bool            fIsStatement;
+        bool            fBasicBlock;
+        bool            fEndSequence;
+        bool            fPrologueEnd;
+        bool            fEpilogueBegin;
+        uint32_t        uIsa;
+        uint32_t        uDiscriminator;
+        RTSEL           uSegment;
+    } Regs;
+    /** @} */
+
+    /** Header. */
+    struct
+    {
+        uint32_t        uVer;
+        uint64_t        offFirstOpcode;
+        uint8_t         cbMinInstr;
+        uint8_t         cMaxOpsPerInstr;
+        uint8_t         u8DefIsStmt;
+        int8_t          s8LineBase;
+        uint8_t         u8LineRange;
+        uint8_t         u8OpcodeBase;
+        uint8_t const  *pacStdOperands;
+    } Hdr;
+
+    /** @name Include Path Table (0-based)
+     * @{ */
+    const char    **papszIncPaths;
+    uint32_t        cIncPaths;
+    /** @} */
+
+    /** @name File Name Table (0-based, dummy zero entry)
+     * @{ */
+    char          **papszFileNames;
+    uint32_t        cFileNames;
+    /** @} */
+
+    /** The DWARF debug info reader instance. */
+    PRTDBGMODDWARF  pDwarfMod;
+} RTDWARFLINESTATE;
+/** Pointer to a DWARF line number program state. */
+typedef RTDWARFLINESTATE *PRTDWARFLINESTATE;
+
+
+/**
+ * Decodes an attribute and stores it in the specified DIE member field.
+ *
+ * @returns IPRT status code.
+ * @param   pDie            Pointer to the DIE structure.
+ * @param   pbMember        Pointer to the first byte in the member.
+ * @param   pDesc           The attribute descriptor.
+ * @param   uForm           The data form.
+ * @param   pCursor         The cursor to read data from.
+ */
+typedef DECLCALLBACK(int) FNRTDWARFATTRDECODER(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                               uint32_t uForm, PRTDWARFCURSOR pCursor);
+/** Pointer to an attribute decoder callback. */
+typedef FNRTDWARFATTRDECODER *PFNRTDWARFATTRDECODER;
+
+/**
+ * Attribute descriptor.
+ */
+typedef struct RTDWARFATTRDESC
+{
+    /** The attribute. */
+    uint16_t                uAttr;
+    /** The data member offset. */
+    uint16_t                off;
+    /** The data member size and initialization method. */
+    uint8_t                 cbInit;
+    uint8_t                 bPadding[3]; /**< Alignment padding. */
+    /** The decoder function. */
+    PFNRTDWARFATTRDECODER   pfnDecoder;
+} RTDWARFATTRDESC;
+
+/** Define a attribute entry. */
+#define ATTR_ENTRY(a_uAttr, a_Struct, a_Member, a_Init, a_pfnDecoder) \
+    { \
+        a_uAttr, \
+        (uint16_t)RT_OFFSETOF(a_Struct, a_Member), \
+        a_Init | ((uint8_t)RT_SIZEOFMEMB(a_Struct, a_Member) & ATTR_SIZE_MASK), \
+        { 0, 0, 0 }, \
+        a_pfnDecoder\
+    }
+
+/** @name Attribute size and init methods.
+ * @{ */
+#define ATTR_INIT_ZERO      UINT8_C(0x00)
+#define ATTR_INIT_FFFS      UINT8_C(0x80)
+#define ATTR_INIT_MASK      UINT8_C(0x80)
+#define ATTR_SIZE_MASK      UINT8_C(0x3f)
+#define ATTR_GET_SIZE(a_pAttrDesc)   ((a_pAttrDesc)->cbInit & ATTR_SIZE_MASK)
+/** @} */
+
+
+/**
+ * DIE descriptor.
+ */
+typedef struct RTDWARFDIEDESC
+{
+    /** The size of the DIE. */
+    size_t              cbDie;
+    /** The number of attributes. */
+    size_t              cAttributes;
+    /** Pointer to the array of attributes. */
+    PCRTDWARFATTRDESC   paAttributes;
+} RTDWARFDIEDESC;
+typedef struct RTDWARFDIEDESC const *PCRTDWARFDIEDESC;
+/** DIE descriptor initializer. */
+#define DIE_DESC_INIT(a_Type, a_aAttrs)  { sizeof(a_Type), RT_ELEMENTS(a_aAttrs), &a_aAttrs[0] }
+
+
+/**
+ * DIE core structure, all inherits (starts with) this.
+ */
+typedef struct RTDWARFDIE
+{
+    /** Pointer to the parent node. NULL if root unit. */
+    struct RTDWARFDIE  *pParent;
+    /** Our node in the sibling list. */
+    RTLISTNODE          SiblingNode;
+    /** List of children. */
+    RTLISTNODE          ChildList;
+    /** The number of attributes successfully decoded. */
+    uint8_t             cDecodedAttrs;
+    /** The number of unknown or otherwise unhandled attributes. */
+    uint8_t             cUnhandledAttrs;
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+    /** The allocator index. */
+    uint8_t             iAllocator;
+#endif
+    /** The die tag, indicating which union structure to use. */
+    uint16_t            uTag;
+    /** Offset of the abbreviation specification (within debug_abbrev). */
+    uint32_t            offSpec;
+} RTDWARFDIE;
+
+
+/**
+ * DWARF address structure.
+ */
+typedef struct RTDWARFADDR
+{
+    /** The address. */
+    uint64_t            uAddress;
+} RTDWARFADDR;
+typedef RTDWARFADDR *PRTDWARFADDR;
+typedef RTDWARFADDR const *PCRTDWARFADDR;
+
+
+/**
+ * DWARF address range.
+ */
+typedef struct RTDWARFADDRRANGE
+{
+    uint64_t            uLowAddress;
+    uint64_t            uHighAddress;
+    uint8_t const      *pbRanges; /* ?? */
+    uint8_t             cAttrs           : 2;
+    uint8_t             fHaveLowAddress  : 1;
+    uint8_t             fHaveHighAddress : 1;
+    uint8_t             fHaveHighIsAddress : 1;
+    uint8_t             fHaveRanges      : 1;
+} RTDWARFADDRRANGE;
+typedef RTDWARFADDRRANGE *PRTDWARFADDRRANGE;
+typedef RTDWARFADDRRANGE const *PCRTDWARFADDRRANGE;
+
+/** What a RTDWARFREF is relative to. */
+typedef enum krtDwarfRef
+{
+    krtDwarfRef_NotSet,
+    krtDwarfRef_LineSection,
+    krtDwarfRef_LocSection,
+    krtDwarfRef_RangesSection,
+    krtDwarfRef_InfoSection,
+    krtDwarfRef_SameUnit,
+    krtDwarfRef_TypeId64
+} krtDwarfRef;
+
+/**
+ * DWARF reference.
+ */
+typedef struct RTDWARFREF
+{
+    /** The offset. */
+    uint64_t        off;
+    /** What the offset is relative to. */
+    krtDwarfRef     enmWrt;
+} RTDWARFREF;
+typedef RTDWARFREF *PRTDWARFREF;
+typedef RTDWARFREF const *PCRTDWARFREF;
+
+
+/**
+ * DWARF Location state.
+ */
+typedef struct RTDWARFLOCST
+{
+    /** The input cursor. */
+    RTDWARFCURSOR   Cursor;
+    /** Points to the current top of the stack. Initial value -1. */
+    int32_t         iTop;
+    /** The value stack. */
+    uint64_t        auStack[64];
+} RTDWARFLOCST;
+/** Pointer to location state. */
+typedef RTDWARFLOCST *PRTDWARFLOCST;
+
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static FNRTDWARFATTRDECODER rtDwarfDecode_Address;
+static FNRTDWARFATTRDECODER rtDwarfDecode_Bool;
+static FNRTDWARFATTRDECODER rtDwarfDecode_LowHighPc;
+static FNRTDWARFATTRDECODER rtDwarfDecode_Ranges;
+static FNRTDWARFATTRDECODER rtDwarfDecode_Reference;
+static FNRTDWARFATTRDECODER rtDwarfDecode_SectOff;
+static FNRTDWARFATTRDECODER rtDwarfDecode_String;
+static FNRTDWARFATTRDECODER rtDwarfDecode_UnsignedInt;
+static FNRTDWARFATTRDECODER rtDwarfDecode_SegmentLoc;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** RTDWARFDIE description. */
+static const RTDWARFDIEDESC g_CoreDieDesc = { sizeof(RTDWARFDIE), 0, NULL };
+
+
+/**
+ * DW_TAG_compile_unit & DW_TAG_partial_unit.
+ */
+typedef struct RTDWARFDIECOMPILEUNIT
+{
+    /** The DIE core structure. */
+    RTDWARFDIE          Core;
+    /** The unit name. */
+    const char         *pszName;
+    /** The address range of the code belonging to this unit. */
+    RTDWARFADDRRANGE    PcRange;
+    /** The language name. */
+    uint16_t            uLanguage;
+    /** The identifier case. */
+    uint8_t             uIdentifierCase;
+    /** String are UTF-8 encoded.  If not set, the encoding is
+     * unknown. */
+    bool                fUseUtf8;
+    /** The unit contains main() or equivalent. */
+    bool                fMainFunction;
+    /** The line numbers for this unit. */
+    RTDWARFREF          StmtListRef;
+    /** The macro information for this unit. */
+    RTDWARFREF          MacroInfoRef;
+    /** Reference to the base types. */
+    RTDWARFREF          BaseTypesRef;
+    /** Working directory for the unit. */
+    const char         *pszCurDir;
+    /** The name of the compiler or whatever that produced this unit. */
+    const char         *pszProducer;
+
+    /** @name From the unit header.
+     * @{ */
+    /** The offset into debug_info of this unit (for references). */
+    uint64_t            offUnit;
+    /** The length of this unit. */
+    uint64_t            cbUnit;
+    /** The offset into debug_abbrev of the abbreviation for this unit. */
+    uint64_t            offAbbrev;
+    /** The native address size. */
+    uint8_t             cbNativeAddr;
+    /** The DWARF version. */
+    uint8_t             uDwarfVer;
+    /** @} */
+} RTDWARFDIECOMPILEUNIT;
+typedef RTDWARFDIECOMPILEUNIT *PRTDWARFDIECOMPILEUNIT;
+
+
+/** RTDWARFDIECOMPILEUNIT attributes. */
+static const RTDWARFATTRDESC g_aCompileUnitAttrs[] =
+{
+    ATTR_ENTRY(DW_AT_name,              RTDWARFDIECOMPILEUNIT, pszName,        ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_low_pc,            RTDWARFDIECOMPILEUNIT, PcRange,        ATTR_INIT_ZERO, rtDwarfDecode_LowHighPc),
+    ATTR_ENTRY(DW_AT_high_pc,           RTDWARFDIECOMPILEUNIT, PcRange,        ATTR_INIT_ZERO, rtDwarfDecode_LowHighPc),
+    ATTR_ENTRY(DW_AT_ranges,            RTDWARFDIECOMPILEUNIT, PcRange,        ATTR_INIT_ZERO, rtDwarfDecode_Ranges),
+    ATTR_ENTRY(DW_AT_language,          RTDWARFDIECOMPILEUNIT, uLanguage,      ATTR_INIT_ZERO, rtDwarfDecode_UnsignedInt),
+    ATTR_ENTRY(DW_AT_macro_info,        RTDWARFDIECOMPILEUNIT, MacroInfoRef,   ATTR_INIT_ZERO, rtDwarfDecode_SectOff),
+    ATTR_ENTRY(DW_AT_stmt_list,         RTDWARFDIECOMPILEUNIT, StmtListRef,    ATTR_INIT_ZERO, rtDwarfDecode_SectOff),
+    ATTR_ENTRY(DW_AT_comp_dir,          RTDWARFDIECOMPILEUNIT, pszCurDir,      ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_producer,          RTDWARFDIECOMPILEUNIT, pszProducer,    ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_identifier_case,   RTDWARFDIECOMPILEUNIT, uIdentifierCase,ATTR_INIT_ZERO, rtDwarfDecode_UnsignedInt),
+    ATTR_ENTRY(DW_AT_base_types,        RTDWARFDIECOMPILEUNIT, BaseTypesRef,   ATTR_INIT_ZERO, rtDwarfDecode_Reference),
+    ATTR_ENTRY(DW_AT_use_UTF8,          RTDWARFDIECOMPILEUNIT, fUseUtf8,       ATTR_INIT_ZERO, rtDwarfDecode_Bool),
+    ATTR_ENTRY(DW_AT_main_subprogram,   RTDWARFDIECOMPILEUNIT, fMainFunction,  ATTR_INIT_ZERO, rtDwarfDecode_Bool)
+};
+
+/** RTDWARFDIECOMPILEUNIT description. */
+static const RTDWARFDIEDESC g_CompileUnitDesc = DIE_DESC_INIT(RTDWARFDIECOMPILEUNIT, g_aCompileUnitAttrs);
+
+
+/**
+ * DW_TAG_subprogram.
+ */
+typedef struct RTDWARFDIESUBPROGRAM
+{
+    /** The DIE core structure. */
+    RTDWARFDIE          Core;
+    /** The name. */
+    const char         *pszName;
+    /** The linkage name. */
+    const char         *pszLinkageName;
+    /** The address range of the code belonging to this unit. */
+    RTDWARFADDRRANGE    PcRange;
+    /** The first instruction in the function. */
+    RTDWARFADDR         EntryPc;
+    /** Segment number (watcom). */
+    RTSEL               uSegment;
+    /** Reference to the specification. */
+    RTDWARFREF          SpecRef;
+} RTDWARFDIESUBPROGRAM;
+/** Pointer to a DW_TAG_subprogram DIE. */
+typedef RTDWARFDIESUBPROGRAM *PRTDWARFDIESUBPROGRAM;
+/** Pointer to a const DW_TAG_subprogram DIE. */
+typedef RTDWARFDIESUBPROGRAM const *PCRTDWARFDIESUBPROGRAM;
+
+
+/** RTDWARFDIESUBPROGRAM attributes. */
+static const RTDWARFATTRDESC g_aSubProgramAttrs[] =
+{
+    ATTR_ENTRY(DW_AT_name,              RTDWARFDIESUBPROGRAM, pszName,        ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_linkage_name,      RTDWARFDIESUBPROGRAM, pszLinkageName, ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_MIPS_linkage_name, RTDWARFDIESUBPROGRAM, pszLinkageName, ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_low_pc,            RTDWARFDIESUBPROGRAM, PcRange,        ATTR_INIT_ZERO, rtDwarfDecode_LowHighPc),
+    ATTR_ENTRY(DW_AT_high_pc,           RTDWARFDIESUBPROGRAM, PcRange,        ATTR_INIT_ZERO, rtDwarfDecode_LowHighPc),
+    ATTR_ENTRY(DW_AT_ranges,            RTDWARFDIESUBPROGRAM, PcRange,        ATTR_INIT_ZERO, rtDwarfDecode_Ranges),
+    ATTR_ENTRY(DW_AT_entry_pc,          RTDWARFDIESUBPROGRAM, EntryPc,        ATTR_INIT_ZERO, rtDwarfDecode_Address),
+    ATTR_ENTRY(DW_AT_segment,           RTDWARFDIESUBPROGRAM, uSegment,       ATTR_INIT_ZERO, rtDwarfDecode_SegmentLoc),
+    ATTR_ENTRY(DW_AT_specification,     RTDWARFDIESUBPROGRAM, SpecRef,        ATTR_INIT_ZERO, rtDwarfDecode_Reference)
+};
+
+/** RTDWARFDIESUBPROGRAM description. */
+static const RTDWARFDIEDESC g_SubProgramDesc = DIE_DESC_INIT(RTDWARFDIESUBPROGRAM, g_aSubProgramAttrs);
+
+
+/** RTDWARFDIESUBPROGRAM attributes for the specification hack. */
+static const RTDWARFATTRDESC g_aSubProgramSpecHackAttrs[] =
+{
+    ATTR_ENTRY(DW_AT_name,              RTDWARFDIESUBPROGRAM, pszName,        ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_linkage_name,      RTDWARFDIESUBPROGRAM, pszLinkageName, ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_MIPS_linkage_name, RTDWARFDIESUBPROGRAM, pszLinkageName, ATTR_INIT_ZERO, rtDwarfDecode_String),
+};
+
+/** RTDWARFDIESUBPROGRAM description for the specification hack. */
+static const RTDWARFDIEDESC g_SubProgramSpecHackDesc = DIE_DESC_INIT(RTDWARFDIESUBPROGRAM, g_aSubProgramSpecHackAttrs);
+
+
+/**
+ * DW_TAG_label.
+ */
+typedef struct RTDWARFDIELABEL
+{
+    /** The DIE core structure. */
+    RTDWARFDIE          Core;
+    /** The name. */
+    const char         *pszName;
+    /** The address of the first instruction. */
+    RTDWARFADDR         Address;
+    /** Segment number (watcom). */
+    RTSEL               uSegment;
+    /** Externally visible? */
+    bool                fExternal;
+} RTDWARFDIELABEL;
+/** Pointer to a DW_TAG_label DIE. */
+typedef RTDWARFDIELABEL *PRTDWARFDIELABEL;
+/** Pointer to a const DW_TAG_label DIE. */
+typedef RTDWARFDIELABEL const *PCRTDWARFDIELABEL;
+
+
+/** RTDWARFDIESUBPROGRAM attributes. */
+static const RTDWARFATTRDESC g_aLabelAttrs[] =
+{
+    ATTR_ENTRY(DW_AT_name,              RTDWARFDIELABEL, pszName,               ATTR_INIT_ZERO, rtDwarfDecode_String),
+    ATTR_ENTRY(DW_AT_low_pc,            RTDWARFDIELABEL, Address,               ATTR_INIT_ZERO, rtDwarfDecode_Address),
+    ATTR_ENTRY(DW_AT_segment,           RTDWARFDIELABEL, uSegment,              ATTR_INIT_ZERO, rtDwarfDecode_SegmentLoc),
+    ATTR_ENTRY(DW_AT_external,          RTDWARFDIELABEL, fExternal,             ATTR_INIT_ZERO, rtDwarfDecode_Bool)
+};
+
+/** RTDWARFDIESUBPROGRAM description. */
+static const RTDWARFDIEDESC g_LabelDesc = DIE_DESC_INIT(RTDWARFDIELABEL, g_aLabelAttrs);
+
+
+/**
+ * Tag names and descriptors.
+ */
+static const struct RTDWARFTAGDESC
+{
+    /** The tag value. */
+    uint16_t            uTag;
+    /** The tag name as string. */
+    const char         *pszName;
+    /** The DIE descriptor to use. */
+    PCRTDWARFDIEDESC    pDesc;
+}   g_aTagDescs[] =
+{
+#define TAGDESC(a_Name, a_pDesc)        { DW_ ## a_Name, #a_Name, a_pDesc }
+#define TAGDESC_EMPTY()                 { 0, NULL, NULL }
+#define TAGDESC_CORE(a_Name)            TAGDESC(a_Name, &g_CoreDieDesc)
+    TAGDESC_EMPTY(),                            /* 0x00 */
+    TAGDESC_CORE(TAG_array_type),
+    TAGDESC_CORE(TAG_class_type),
+    TAGDESC_CORE(TAG_entry_point),
+    TAGDESC_CORE(TAG_enumeration_type),         /* 0x04 */
+    TAGDESC_CORE(TAG_formal_parameter),
+    TAGDESC_EMPTY(),
+    TAGDESC_EMPTY(),
+    TAGDESC_CORE(TAG_imported_declaration),     /* 0x08 */
+    TAGDESC_EMPTY(),
+    TAGDESC(TAG_label, &g_LabelDesc),
+    TAGDESC_CORE(TAG_lexical_block),
+    TAGDESC_EMPTY(),                            /* 0x0c */
+    TAGDESC_CORE(TAG_member),
+    TAGDESC_EMPTY(),
+    TAGDESC_CORE(TAG_pointer_type),
+    TAGDESC_CORE(TAG_reference_type),           /* 0x10 */
+    TAGDESC_CORE(TAG_compile_unit),
+    TAGDESC_CORE(TAG_string_type),
+    TAGDESC_CORE(TAG_structure_type),
+    TAGDESC_EMPTY(),                            /* 0x14 */
+    TAGDESC_CORE(TAG_subroutine_type),
+    TAGDESC_CORE(TAG_typedef),
+    TAGDESC_CORE(TAG_union_type),
+    TAGDESC_CORE(TAG_unspecified_parameters),   /* 0x18 */
+    TAGDESC_CORE(TAG_variant),
+    TAGDESC_CORE(TAG_common_block),
+    TAGDESC_CORE(TAG_common_inclusion),
+    TAGDESC_CORE(TAG_inheritance),              /* 0x1c */
+    TAGDESC_CORE(TAG_inlined_subroutine),
+    TAGDESC_CORE(TAG_module),
+    TAGDESC_CORE(TAG_ptr_to_member_type),
+    TAGDESC_CORE(TAG_set_type),                 /* 0x20 */
+    TAGDESC_CORE(TAG_subrange_type),
+    TAGDESC_CORE(TAG_with_stmt),
+    TAGDESC_CORE(TAG_access_declaration),
+    TAGDESC_CORE(TAG_base_type),                /* 0x24 */
+    TAGDESC_CORE(TAG_catch_block),
+    TAGDESC_CORE(TAG_const_type),
+    TAGDESC_CORE(TAG_constant),
+    TAGDESC_CORE(TAG_enumerator),               /* 0x28 */
+    TAGDESC_CORE(TAG_file_type),
+    TAGDESC_CORE(TAG_friend),
+    TAGDESC_CORE(TAG_namelist),
+    TAGDESC_CORE(TAG_namelist_item),            /* 0x2c */
+    TAGDESC_CORE(TAG_packed_type),
+    TAGDESC(TAG_subprogram, &g_SubProgramDesc),
+    TAGDESC_CORE(TAG_template_type_parameter),
+    TAGDESC_CORE(TAG_template_value_parameter), /* 0x30 */
+    TAGDESC_CORE(TAG_thrown_type),
+    TAGDESC_CORE(TAG_try_block),
+    TAGDESC_CORE(TAG_variant_part),
+    TAGDESC_CORE(TAG_variable),                 /* 0x34 */
+    TAGDESC_CORE(TAG_volatile_type),
+    TAGDESC_CORE(TAG_dwarf_procedure),
+    TAGDESC_CORE(TAG_restrict_type),
+    TAGDESC_CORE(TAG_interface_type),           /* 0x38 */
+    TAGDESC_CORE(TAG_namespace),
+    TAGDESC_CORE(TAG_imported_module),
+    TAGDESC_CORE(TAG_unspecified_type),
+    TAGDESC_CORE(TAG_partial_unit),             /* 0x3c */
+    TAGDESC_CORE(TAG_imported_unit),
+    TAGDESC_EMPTY(),
+    TAGDESC_CORE(TAG_condition),
+    TAGDESC_CORE(TAG_shared_type),              /* 0x40 */
+    TAGDESC_CORE(TAG_type_unit),
+    TAGDESC_CORE(TAG_rvalue_reference_type),
+    TAGDESC_CORE(TAG_template_alias)
+#undef TAGDESC
+#undef TAGDESC_EMPTY
+#undef TAGDESC_CORE
+};
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static int rtDwarfInfo_ParseDie(PRTDBGMODDWARF pThis, PRTDWARFDIE pDie, PCRTDWARFDIEDESC pDieDesc,
+                                PRTDWARFCURSOR pCursor, PCRTDWARFABBREV pAbbrev, bool fInitDie);
+
+
+
+#if defined(LOG_ENABLED) || defined(RT_STRICT)
+
+# if 0 /* unused */
+/**
+ * Turns a tag value into a string for logging purposes.
+ *
+ * @returns String name.
+ * @param   uTag            The tag.
+ */
+static const char *rtDwarfLog_GetTagName(uint32_t uTag)
+{
+    if (uTag < RT_ELEMENTS(g_aTagDescs))
+    {
+        const char *pszTag = g_aTagDescs[uTag].pszName;
+        if (pszTag)
+            return pszTag;
+    }
+
+    static char s_szStatic[32];
+    RTStrPrintf(s_szStatic, sizeof(s_szStatic),"DW_TAG_%#x", uTag);
+    return s_szStatic;
+}
+# endif
+
+
+/**
+ * Turns an attributevalue into a string for logging purposes.
+ *
+ * @returns String name.
+ * @param   uAttr               The attribute.
+ */
+static const char *rtDwarfLog_AttrName(uint32_t uAttr)
+{
+    switch (uAttr)
+    {
+        RT_CASE_RET_STR(DW_AT_sibling);
+        RT_CASE_RET_STR(DW_AT_location);
+        RT_CASE_RET_STR(DW_AT_name);
+        RT_CASE_RET_STR(DW_AT_ordering);
+        RT_CASE_RET_STR(DW_AT_byte_size);
+        RT_CASE_RET_STR(DW_AT_bit_offset);
+        RT_CASE_RET_STR(DW_AT_bit_size);
+        RT_CASE_RET_STR(DW_AT_stmt_list);
+        RT_CASE_RET_STR(DW_AT_low_pc);
+        RT_CASE_RET_STR(DW_AT_high_pc);
+        RT_CASE_RET_STR(DW_AT_language);
+        RT_CASE_RET_STR(DW_AT_discr);
+        RT_CASE_RET_STR(DW_AT_discr_value);
+        RT_CASE_RET_STR(DW_AT_visibility);
+        RT_CASE_RET_STR(DW_AT_import);
+        RT_CASE_RET_STR(DW_AT_string_length);
+        RT_CASE_RET_STR(DW_AT_common_reference);
+        RT_CASE_RET_STR(DW_AT_comp_dir);
+        RT_CASE_RET_STR(DW_AT_const_value);
+        RT_CASE_RET_STR(DW_AT_containing_type);
+        RT_CASE_RET_STR(DW_AT_default_value);
+        RT_CASE_RET_STR(DW_AT_inline);
+        RT_CASE_RET_STR(DW_AT_is_optional);
+        RT_CASE_RET_STR(DW_AT_lower_bound);
+        RT_CASE_RET_STR(DW_AT_producer);
+        RT_CASE_RET_STR(DW_AT_prototyped);
+        RT_CASE_RET_STR(DW_AT_return_addr);
+        RT_CASE_RET_STR(DW_AT_start_scope);
+        RT_CASE_RET_STR(DW_AT_bit_stride);
+        RT_CASE_RET_STR(DW_AT_upper_bound);
+        RT_CASE_RET_STR(DW_AT_abstract_origin);
+        RT_CASE_RET_STR(DW_AT_accessibility);
+        RT_CASE_RET_STR(DW_AT_address_class);
+        RT_CASE_RET_STR(DW_AT_artificial);
+        RT_CASE_RET_STR(DW_AT_base_types);
+        RT_CASE_RET_STR(DW_AT_calling_convention);
+        RT_CASE_RET_STR(DW_AT_count);
+        RT_CASE_RET_STR(DW_AT_data_member_location);
+        RT_CASE_RET_STR(DW_AT_decl_column);
+        RT_CASE_RET_STR(DW_AT_decl_file);
+        RT_CASE_RET_STR(DW_AT_decl_line);
+        RT_CASE_RET_STR(DW_AT_declaration);
+        RT_CASE_RET_STR(DW_AT_discr_list);
+        RT_CASE_RET_STR(DW_AT_encoding);
+        RT_CASE_RET_STR(DW_AT_external);
+        RT_CASE_RET_STR(DW_AT_frame_base);
+        RT_CASE_RET_STR(DW_AT_friend);
+        RT_CASE_RET_STR(DW_AT_identifier_case);
+        RT_CASE_RET_STR(DW_AT_macro_info);
+        RT_CASE_RET_STR(DW_AT_namelist_item);
+        RT_CASE_RET_STR(DW_AT_priority);
+        RT_CASE_RET_STR(DW_AT_segment);
+        RT_CASE_RET_STR(DW_AT_specification);
+        RT_CASE_RET_STR(DW_AT_static_link);
+        RT_CASE_RET_STR(DW_AT_type);
+        RT_CASE_RET_STR(DW_AT_use_location);
+        RT_CASE_RET_STR(DW_AT_variable_parameter);
+        RT_CASE_RET_STR(DW_AT_virtuality);
+        RT_CASE_RET_STR(DW_AT_vtable_elem_location);
+        RT_CASE_RET_STR(DW_AT_allocated);
+        RT_CASE_RET_STR(DW_AT_associated);
+        RT_CASE_RET_STR(DW_AT_data_location);
+        RT_CASE_RET_STR(DW_AT_byte_stride);
+        RT_CASE_RET_STR(DW_AT_entry_pc);
+        RT_CASE_RET_STR(DW_AT_use_UTF8);
+        RT_CASE_RET_STR(DW_AT_extension);
+        RT_CASE_RET_STR(DW_AT_ranges);
+        RT_CASE_RET_STR(DW_AT_trampoline);
+        RT_CASE_RET_STR(DW_AT_call_column);
+        RT_CASE_RET_STR(DW_AT_call_file);
+        RT_CASE_RET_STR(DW_AT_call_line);
+        RT_CASE_RET_STR(DW_AT_description);
+        RT_CASE_RET_STR(DW_AT_binary_scale);
+        RT_CASE_RET_STR(DW_AT_decimal_scale);
+        RT_CASE_RET_STR(DW_AT_small);
+        RT_CASE_RET_STR(DW_AT_decimal_sign);
+        RT_CASE_RET_STR(DW_AT_digit_count);
+        RT_CASE_RET_STR(DW_AT_picture_string);
+        RT_CASE_RET_STR(DW_AT_mutable);
+        RT_CASE_RET_STR(DW_AT_threads_scaled);
+        RT_CASE_RET_STR(DW_AT_explicit);
+        RT_CASE_RET_STR(DW_AT_object_pointer);
+        RT_CASE_RET_STR(DW_AT_endianity);
+        RT_CASE_RET_STR(DW_AT_elemental);
+        RT_CASE_RET_STR(DW_AT_pure);
+        RT_CASE_RET_STR(DW_AT_recursive);
+        RT_CASE_RET_STR(DW_AT_signature);
+        RT_CASE_RET_STR(DW_AT_main_subprogram);
+        RT_CASE_RET_STR(DW_AT_data_bit_offset);
+        RT_CASE_RET_STR(DW_AT_const_expr);
+        RT_CASE_RET_STR(DW_AT_enum_class);
+        RT_CASE_RET_STR(DW_AT_linkage_name);
+        RT_CASE_RET_STR(DW_AT_MIPS_linkage_name);
+        RT_CASE_RET_STR(DW_AT_WATCOM_memory_model);
+        RT_CASE_RET_STR(DW_AT_WATCOM_references_start);
+        RT_CASE_RET_STR(DW_AT_WATCOM_parm_entry);
+    }
+    static char s_szStatic[32];
+    RTStrPrintf(s_szStatic, sizeof(s_szStatic),"DW_AT_%#x", uAttr);
+    return s_szStatic;
+}
+
+
+/**
+ * Turns a form value into a string for logging purposes.
+ *
+ * @returns String name.
+ * @param   uForm               The form.
+ */
+static const char *rtDwarfLog_FormName(uint32_t uForm)
+{
+    switch (uForm)
+    {
+        RT_CASE_RET_STR(DW_FORM_addr);
+        RT_CASE_RET_STR(DW_FORM_block2);
+        RT_CASE_RET_STR(DW_FORM_block4);
+        RT_CASE_RET_STR(DW_FORM_data2);
+        RT_CASE_RET_STR(DW_FORM_data4);
+        RT_CASE_RET_STR(DW_FORM_data8);
+        RT_CASE_RET_STR(DW_FORM_string);
+        RT_CASE_RET_STR(DW_FORM_block);
+        RT_CASE_RET_STR(DW_FORM_block1);
+        RT_CASE_RET_STR(DW_FORM_data1);
+        RT_CASE_RET_STR(DW_FORM_flag);
+        RT_CASE_RET_STR(DW_FORM_sdata);
+        RT_CASE_RET_STR(DW_FORM_strp);
+        RT_CASE_RET_STR(DW_FORM_udata);
+        RT_CASE_RET_STR(DW_FORM_ref_addr);
+        RT_CASE_RET_STR(DW_FORM_ref1);
+        RT_CASE_RET_STR(DW_FORM_ref2);
+        RT_CASE_RET_STR(DW_FORM_ref4);
+        RT_CASE_RET_STR(DW_FORM_ref8);
+        RT_CASE_RET_STR(DW_FORM_ref_udata);
+        RT_CASE_RET_STR(DW_FORM_indirect);
+        RT_CASE_RET_STR(DW_FORM_sec_offset);
+        RT_CASE_RET_STR(DW_FORM_exprloc);
+        RT_CASE_RET_STR(DW_FORM_flag_present);
+        RT_CASE_RET_STR(DW_FORM_ref_sig8);
+    }
+    static char s_szStatic[32];
+    RTStrPrintf(s_szStatic, sizeof(s_szStatic),"DW_FORM_%#x", uForm);
+    return s_szStatic;
+}
+
+#endif /* LOG_ENABLED || RT_STRICT */
+
+
+
+/** @callback_method_impl{FNRTLDRENUMSEGS} */
+static DECLCALLBACK(int) rtDbgModDwarfScanSegmentsCallback(RTLDRMOD hLdrMod, PCRTLDRSEG pSeg, void *pvUser)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pvUser;
+    Log(("Segment %.*s: LinkAddress=%#llx RVA=%#llx cb=%#llx\n",
+         pSeg->cchName, pSeg->pszName, (uint64_t)pSeg->LinkAddress, (uint64_t)pSeg->RVA, pSeg->cb));
+    NOREF(hLdrMod);
+
+    /* Count relevant segments. */
+    if (pSeg->RVA != NIL_RTLDRADDR)
+        pThis->cSegs++;
+
+    return VINF_SUCCESS;
+}
+
+
+/** @callback_method_impl{FNRTLDRENUMSEGS} */
+static DECLCALLBACK(int) rtDbgModDwarfAddSegmentsCallback(RTLDRMOD hLdrMod, PCRTLDRSEG pSeg, void *pvUser)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pvUser;
+    Log(("Segment %.*s: LinkAddress=%#llx RVA=%#llx cb=%#llx cbMapped=%#llx\n",
+         pSeg->cchName, pSeg->pszName, (uint64_t)pSeg->LinkAddress, (uint64_t)pSeg->RVA, pSeg->cb, pSeg->cbMapped));
+    NOREF(hLdrMod);
+    Assert(pSeg->cchName > 0);
+    Assert(!pSeg->pszName[pSeg->cchName]);
+
+    /* If the segment doesn't have a mapping, just add a dummy so the indexing
+       works out correctly (same as for the image). */
+    if (pSeg->RVA == NIL_RTLDRADDR)
+        return RTDbgModSegmentAdd(pThis->hCnt, 0, 0, pSeg->pszName, 0 /*fFlags*/, NULL);
+
+    /* The link address is 0 for all segments in a relocatable ELF image. */
+    RTLDRADDR cb = pSeg->cb;
+    if (   cb < pSeg->cbMapped
+        && RTLdrGetFormat(hLdrMod) != RTLDRFMT_LX /* for debugging our drivers; 64KB section align by linker, 4KB by loader. */
+       )
+        cb = pSeg->cbMapped;
+    return RTDbgModSegmentAdd(pThis->hCnt, pSeg->RVA, cb, pSeg->pszName, 0 /*fFlags*/, NULL);
+}
+
+
+/**
+ * Calls rtDbgModDwarfAddSegmentsCallback for each segment in the executable
+ * image.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ */
+static int rtDbgModDwarfAddSegmentsFromImage(PRTDBGMODDWARF pThis)
+{
+    AssertReturn(pThis->pImgMod && pThis->pImgMod->pImgVt, VERR_INTERNAL_ERROR_2);
+    Assert(!pThis->cSegs);
+    int rc = pThis->pImgMod->pImgVt->pfnEnumSegments(pThis->pImgMod, rtDbgModDwarfScanSegmentsCallback, pThis);
+    if (RT_SUCCESS(rc))
+    {
+        if (pThis->cSegs == 0)
+            pThis->iWatcomPass = 1;
+        else
+        {
+            pThis->cSegs = 0;
+            pThis->iWatcomPass = -1;
+            rc = pThis->pImgMod->pImgVt->pfnEnumSegments(pThis->pImgMod, rtDbgModDwarfAddSegmentsCallback, pThis);
+        }
+    }
+
+    return rc;
+}
+
+
+/**
+ * Looks up a segment.
+ *
+ * @returns Pointer to the segment on success, NULL if not found.
+ * @param   pThis               The DWARF instance.
+ * @param   uSeg                The segment number / selector.
+ */
+static PRTDBGDWARFSEG rtDbgModDwarfFindSegment(PRTDBGMODDWARF pThis, RTSEL uSeg)
+{
+    uint32_t        cSegs  = pThis->cSegs;
+    uint32_t        iSeg   = pThis->iSegHint;
+    PRTDBGDWARFSEG  paSegs = pThis->paSegs;
+    if (   iSeg < cSegs
+        && paSegs[iSeg].uSegment == uSeg)
+        return &paSegs[iSeg];
+
+    for (iSeg = 0; iSeg < cSegs; iSeg++)
+        if (uSeg == paSegs[iSeg].uSegment)
+        {
+            pThis->iSegHint = iSeg;
+            return &paSegs[iSeg];
+        }
+
+    AssertFailed();
+    return NULL;
+}
+
+
+/**
+ * Record a segment:offset during pass 1.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ * @param   uSeg                The segment number / selector.
+ * @param   offSeg              The segment offset.
+ */
+static int rtDbgModDwarfRecordSegOffset(PRTDBGMODDWARF pThis, RTSEL uSeg, uint64_t offSeg)
+{
+    /* Look up the segment. */
+    uint32_t        cSegs  = pThis->cSegs;
+    uint32_t        iSeg   = pThis->iSegHint;
+    PRTDBGDWARFSEG  paSegs = pThis->paSegs;
+    if (   iSeg >= cSegs
+        || paSegs[iSeg].uSegment != uSeg)
+    {
+        for (iSeg = 0; iSeg < cSegs; iSeg++)
+            if (uSeg <= paSegs[iSeg].uSegment)
+                break;
+        if (   iSeg >= cSegs
+            || paSegs[iSeg].uSegment != uSeg)
+        {
+            /* Add */
+            void *pvNew = RTMemRealloc(paSegs, (pThis->cSegs + 1) * sizeof(paSegs[0]));
+            if (!pvNew)
+                return VERR_NO_MEMORY;
+            pThis->paSegs = paSegs = (PRTDBGDWARFSEG)pvNew;
+            if (iSeg != cSegs)
+                memmove(&paSegs[iSeg + 1], &paSegs[iSeg], (cSegs - iSeg) * sizeof(paSegs[0]));
+            paSegs[iSeg].offHighest = offSeg;
+            paSegs[iSeg].uBaseAddr  = 0;
+            paSegs[iSeg].cbSegment  = 0;
+            paSegs[iSeg].uSegment   = uSeg;
+            pThis->cSegs++;
+        }
+
+        pThis->iSegHint = iSeg;
+    }
+
+    /* Increase it's range? */
+    if (paSegs[iSeg].offHighest < offSeg)
+    {
+        Log3(("rtDbgModDwarfRecordSegOffset: iSeg=%d uSeg=%#06x offSeg=%#llx\n", iSeg, uSeg, offSeg));
+        paSegs[iSeg].offHighest = offSeg;
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Calls pfnSegmentAdd for each segment in the executable image.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ */
+static int rtDbgModDwarfAddSegmentsFromPass1(PRTDBGMODDWARF pThis)
+{
+    AssertReturn(pThis->cSegs, VERR_DWARF_BAD_INFO);
+    uint32_t const  cSegs   = pThis->cSegs;
+    PRTDBGDWARFSEG  paSegs  = pThis->paSegs;
+
+    /*
+     * Are the segments assigned more or less in numerical order?
+     */
+    if (   paSegs[0].uSegment < 16U
+        && paSegs[cSegs - 1].uSegment - paSegs[0].uSegment + 1U <= cSegs + 16U)
+    {
+        /** @todo heuristics, plase. */
+        AssertFailedReturn(VERR_DWARF_TODO);
+
+    }
+    /*
+     * Assume DOS segmentation.
+     */
+    else
+    {
+        for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
+            paSegs[iSeg].uBaseAddr = (uint32_t)paSegs[iSeg].uSegment << 16;
+        for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
+            paSegs[iSeg].cbSegment = paSegs[iSeg].offHighest;
+    }
+
+    /*
+     * Add them.
+     */
+    for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
+    {
+        Log3(("rtDbgModDwarfAddSegmentsFromPass1: Seg#%u: %#010llx LB %#llx uSegment=%#x\n",
+              iSeg, paSegs[iSeg].uBaseAddr, paSegs[iSeg].cbSegment, paSegs[iSeg].uSegment));
+        char szName[32];
+        RTStrPrintf(szName, sizeof(szName), "seg-%#04xh", paSegs[iSeg].uSegment);
+        int rc = RTDbgModSegmentAdd(pThis->hCnt, paSegs[iSeg].uBaseAddr, paSegs[iSeg].cbSegment,
+                                    szName, 0 /*fFlags*/, NULL);
+        if (RT_FAILURE(rc))
+            return rc;
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Loads a DWARF section from the image file.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ * @param   enmSect             The section to load.
+ */
+static int rtDbgModDwarfLoadSection(PRTDBGMODDWARF pThis, krtDbgModDwarfSect enmSect)
+{
+    /*
+     * Don't load stuff twice.
+     */
+    if (pThis->aSections[enmSect].pv)
+        return VINF_SUCCESS;
+
+    /*
+     * Sections that are not present cannot be loaded, treat them like they
+     * are empty
+     */
+    if (!pThis->aSections[enmSect].fPresent)
+    {
+        Assert(pThis->aSections[enmSect].cb);
+        return VINF_SUCCESS;
+    }
+    if (!pThis->aSections[enmSect].cb)
+        return VINF_SUCCESS;
+
+    /*
+     * Sections must be readable with the current image interface.
+     */
+    if (pThis->aSections[enmSect].offFile < 0)
+        return VERR_OUT_OF_RANGE;
+
+    /*
+     * Do the job.
+     */
+    return pThis->pDbgInfoMod->pImgVt->pfnMapPart(pThis->pDbgInfoMod,
+                                                  pThis->aSections[enmSect].iDbgInfo,
+                                                  pThis->aSections[enmSect].offFile,
+                                                  pThis->aSections[enmSect].cb,
+                                                  &pThis->aSections[enmSect].pv);
+}
+
+
+#ifdef SOME_UNUSED_FUNCTION
+/**
+ * Unloads a DWARF section previously mapped by rtDbgModDwarfLoadSection.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ * @param   enmSect             The section to unload.
+ */
+static int rtDbgModDwarfUnloadSection(PRTDBGMODDWARF pThis, krtDbgModDwarfSect enmSect)
+{
+    if (!pThis->aSections[enmSect].pv)
+        return VINF_SUCCESS;
+
+    int rc = pThis->pDbgInfoMod->pImgVt->pfnUnmapPart(pThis->pDbgInfoMod, pThis->aSections[enmSect].cb, &pThis->aSections[enmSect].pv);
+    AssertRC(rc);
+    return rc;
+}
+#endif
+
+
+/**
+ * Converts to UTF-8 or otherwise makes sure it's valid UTF-8.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ * @param   ppsz                Pointer to the string pointer.  May be
+ *                              reallocated (RTStr*).
+ */
+static int rtDbgModDwarfStringToUtf8(PRTDBGMODDWARF pThis, char **ppsz)
+{
+    /** @todo DWARF & UTF-8. */
+    NOREF(pThis);
+    RTStrPurgeEncoding(*ppsz);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Convers a link address into a segment+offset or RVA.
+ *
+ * @returns IPRT status code.
+ * @param   pThis           The DWARF instance.
+ * @param   uSegment        The segment, 0 if not applicable.
+ * @param   LinkAddress     The address to convert..
+ * @param   piSeg           The segment index.
+ * @param   poffSeg         Where to return the segment offset.
+ */
+static int rtDbgModDwarfLinkAddressToSegOffset(PRTDBGMODDWARF pThis, RTSEL uSegment, uint64_t LinkAddress,
+                                               PRTDBGSEGIDX piSeg, PRTLDRADDR poffSeg)
+{
+    if (pThis->paSegs)
+    {
+        PRTDBGDWARFSEG pSeg = rtDbgModDwarfFindSegment(pThis, uSegment);
+        if (pSeg)
+        {
+            *piSeg   = pSeg - pThis->paSegs;
+            *poffSeg = LinkAddress;
+            return VINF_SUCCESS;
+        }
+    }
+
+    if (pThis->fUseLinkAddress)
+        return pThis->pImgMod->pImgVt->pfnLinkAddressToSegOffset(pThis->pImgMod, LinkAddress, piSeg, poffSeg);
+
+    /* If we have a non-zero segment number, assume it's correct for now.
+       This helps loading watcom linked LX drivers. */
+    if (uSegment > 0)
+    {
+        *piSeg   = uSegment - 1;
+        *poffSeg = LinkAddress;
+        return VINF_SUCCESS;
+    }
+
+    return pThis->pImgMod->pImgVt->pfnRvaToSegOffset(pThis->pImgMod, LinkAddress, piSeg, poffSeg);
+}
+
+
+/**
+ * Converts a segment+offset address into an RVA.
+ *
+ * @returns IPRT status code.
+ * @param   pThis           The DWARF instance.
+ * @param   idxSegment      The segment index.
+ * @param   offSegment      The segment offset.
+ * @param   puRva           Where to return the calculated RVA.
+ */
+static int rtDbgModDwarfSegOffsetToRva(PRTDBGMODDWARF pThis, RTDBGSEGIDX idxSegment, uint64_t offSegment, PRTUINTPTR puRva)
+{
+    if (pThis->paSegs)
+    {
+        PRTDBGDWARFSEG pSeg = rtDbgModDwarfFindSegment(pThis, idxSegment);
+        if (pSeg)
+        {
+            *puRva = pSeg->uBaseAddr + offSegment;
+            return VINF_SUCCESS;
+        }
+    }
+
+    RTUINTPTR uRva = RTDbgModSegmentRva(pThis->pImgMod, idxSegment);
+    if (uRva != RTUINTPTR_MAX)
+    {
+        *puRva = uRva + offSegment;
+        return VINF_SUCCESS;
+    }
+    return VERR_INVALID_POINTER;
+}
+
+/**
+ * Converts a segment+offset address into an RVA.
+ *
+ * @returns IPRT status code.
+ * @param   pThis           The DWARF instance.
+ * @param   uRva            The RVA to convert.
+ * @param   pidxSegment     Where to return the segment index.
+ * @param   poffSegment     Where to return the segment offset.
+ */
+static int rtDbgModDwarfRvaToSegOffset(PRTDBGMODDWARF pThis, RTUINTPTR uRva, RTDBGSEGIDX *pidxSegment, uint64_t *poffSegment)
+{
+    RTUINTPTR   offSeg = 0;
+    RTDBGSEGIDX idxSeg = RTDbgModRvaToSegOff(pThis->pImgMod, uRva, &offSeg);
+    if (idxSeg != NIL_RTDBGSEGIDX)
+    {
+        *pidxSegment = idxSeg;
+        *poffSegment = offSeg;
+        return VINF_SUCCESS;
+    }
+    return VERR_INVALID_POINTER;
+}
+
+
+
+/*
+ *
+ * DWARF Cursor.
+ * DWARF Cursor.
+ * DWARF Cursor.
+ *
+ */
+
+
+/**
+ * Reads a 8-bit unsigned integer and advances the cursor.
+ *
+ * @returns 8-bit unsigned integer. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           What to return on read error.
+ */
+static uint8_t rtDwarfCursor_GetU8(PRTDWARFCURSOR pCursor, uint8_t uErrValue)
+{
+    if (pCursor->cbUnitLeft < 1)
+    {
+        pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+        return uErrValue;
+    }
+
+    uint8_t u8 = pCursor->pb[0];
+    pCursor->pb         += 1;
+    pCursor->cbUnitLeft -= 1;
+    pCursor->cbLeft     -= 1;
+    return u8;
+}
+
+
+/**
+ * Reads a 16-bit unsigned integer and advances the cursor.
+ *
+ * @returns 16-bit unsigned integer. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           What to return on read error.
+ */
+static uint16_t rtDwarfCursor_GetU16(PRTDWARFCURSOR pCursor, uint16_t uErrValue)
+{
+    if (pCursor->cbUnitLeft < 2)
+    {
+        pCursor->pb         += pCursor->cbUnitLeft;
+        pCursor->cbLeft     -= pCursor->cbUnitLeft;
+        pCursor->cbUnitLeft  = 0;
+        pCursor->rc          = VERR_DWARF_UNEXPECTED_END;
+        return uErrValue;
+    }
+
+    uint16_t u16 = RT_MAKE_U16(pCursor->pb[0], pCursor->pb[1]);
+    pCursor->pb         += 2;
+    pCursor->cbUnitLeft -= 2;
+    pCursor->cbLeft     -= 2;
+    if (!pCursor->fNativEndian)
+        u16 = RT_BSWAP_U16(u16);
+    return u16;
+}
+
+
+/**
+ * Reads a 32-bit unsigned integer and advances the cursor.
+ *
+ * @returns 32-bit unsigned integer. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           What to return on read error.
+ */
+static uint32_t rtDwarfCursor_GetU32(PRTDWARFCURSOR pCursor, uint32_t uErrValue)
+{
+    if (pCursor->cbUnitLeft < 4)
+    {
+        pCursor->pb         += pCursor->cbUnitLeft;
+        pCursor->cbLeft     -= pCursor->cbUnitLeft;
+        pCursor->cbUnitLeft  = 0;
+        pCursor->rc          = VERR_DWARF_UNEXPECTED_END;
+        return uErrValue;
+    }
+
+    uint32_t u32 = RT_MAKE_U32_FROM_U8(pCursor->pb[0], pCursor->pb[1], pCursor->pb[2], pCursor->pb[3]);
+    pCursor->pb         += 4;
+    pCursor->cbUnitLeft -= 4;
+    pCursor->cbLeft     -= 4;
+    if (!pCursor->fNativEndian)
+        u32 = RT_BSWAP_U32(u32);
+    return u32;
+}
+
+
+/**
+ * Reads a 64-bit unsigned integer and advances the cursor.
+ *
+ * @returns 64-bit unsigned integer. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           What to return on read error.
+ */
+static uint64_t rtDwarfCursor_GetU64(PRTDWARFCURSOR pCursor, uint64_t uErrValue)
+{
+    if (pCursor->cbUnitLeft < 8)
+    {
+        pCursor->pb         += pCursor->cbUnitLeft;
+        pCursor->cbLeft     -= pCursor->cbUnitLeft;
+        pCursor->cbUnitLeft  = 0;
+        pCursor->rc          = VERR_DWARF_UNEXPECTED_END;
+        return uErrValue;
+    }
+
+    uint64_t u64 = RT_MAKE_U64_FROM_U8(pCursor->pb[0], pCursor->pb[1], pCursor->pb[2], pCursor->pb[3],
+                                       pCursor->pb[4], pCursor->pb[5], pCursor->pb[6], pCursor->pb[7]);
+    pCursor->pb         += 8;
+    pCursor->cbUnitLeft -= 8;
+    pCursor->cbLeft     -= 8;
+    if (!pCursor->fNativEndian)
+        u64 = RT_BSWAP_U64(u64);
+    return u64;
+}
+
+
+/**
+ * Reads an unsigned LEB128 encoded number.
+ *
+ * @returns unsigned 64-bit number. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           The value to return on error.
+ */
+static uint64_t rtDwarfCursor_GetULeb128(PRTDWARFCURSOR pCursor, uint64_t uErrValue)
+{
+    if (pCursor->cbUnitLeft < 1)
+    {
+        pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+        return uErrValue;
+    }
+
+    /*
+     * Special case - single byte.
+     */
+    uint8_t b = pCursor->pb[0];
+    if (!(b & 0x80))
+    {
+        pCursor->pb         += 1;
+        pCursor->cbUnitLeft -= 1;
+        pCursor->cbLeft     -= 1;
+        return b;
+    }
+
+    /*
+     * Generic case.
+     */
+    /* Decode. */
+    uint32_t off    = 1;
+    uint64_t u64Ret = b & 0x7f;
+    do
+    {
+        if (off == pCursor->cbUnitLeft)
+        {
+            pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+            u64Ret = uErrValue;
+            break;
+        }
+        b = pCursor->pb[off];
+        u64Ret |= (b & 0x7f) << off * 7;
+        off++;
+    } while (b & 0x80);
+
+    /* Update the cursor. */
+    pCursor->pb         += off;
+    pCursor->cbUnitLeft -= off;
+    pCursor->cbLeft     -= off;
+
+    /* Check the range. */
+    uint32_t cBits = off * 7;
+    if (cBits > 64)
+    {
+        pCursor->rc = VERR_DWARF_LEB_OVERFLOW;
+        u64Ret = uErrValue;
+    }
+
+    return u64Ret;
+}
+
+
+/**
+ * Reads a signed LEB128 encoded number.
+ *
+ * @returns signed 64-bit number. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   sErrValue           The value to return on error.
+ */
+static int64_t rtDwarfCursor_GetSLeb128(PRTDWARFCURSOR pCursor, int64_t sErrValue)
+{
+    if (pCursor->cbUnitLeft < 1)
+    {
+        pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+        return sErrValue;
+    }
+
+    /*
+     * Special case - single byte.
+     */
+    uint8_t b = pCursor->pb[0];
+    if (!(b & 0x80))
+    {
+        pCursor->pb         += 1;
+        pCursor->cbUnitLeft -= 1;
+        pCursor->cbLeft     -= 1;
+        if (b & 0x40)
+            b |= 0x80;
+        return (int8_t)b;
+    }
+
+    /*
+     * Generic case.
+     */
+    /* Decode it. */
+    uint32_t off    = 1;
+    uint64_t u64Ret = b & 0x7f;
+    do
+    {
+        if (off == pCursor->cbUnitLeft)
+        {
+            pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+            u64Ret = (uint64_t)sErrValue;
+            break;
+        }
+        b = pCursor->pb[off];
+        u64Ret |= (b & 0x7f) << off * 7;
+        off++;
+    } while (b & 0x80);
+
+    /* Update cursor. */
+    pCursor->pb         += off;
+    pCursor->cbUnitLeft -= off;
+    pCursor->cbLeft     -= off;
+
+    /* Check the range. */
+    uint32_t cBits = off * 7;
+    if (cBits > 64)
+    {
+        pCursor->rc = VERR_DWARF_LEB_OVERFLOW;
+        u64Ret = (uint64_t)sErrValue;
+    }
+    /* Sign extend the value. */
+    else if (u64Ret & RT_BIT_64(cBits - 1))
+        u64Ret |= ~(RT_BIT_64(cBits - 1) - 1);
+
+    return (int64_t)u64Ret;
+}
+
+
+/**
+ * Reads an unsigned LEB128 encoded number, max 32-bit width.
+ *
+ * @returns unsigned 32-bit number. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           The value to return on error.
+ */
+static uint32_t rtDwarfCursor_GetULeb128AsU32(PRTDWARFCURSOR pCursor, uint32_t uErrValue)
+{
+    uint64_t u64 = rtDwarfCursor_GetULeb128(pCursor, uErrValue);
+    if (u64 > UINT32_MAX)
+    {
+        pCursor->rc = VERR_DWARF_LEB_OVERFLOW;
+        return uErrValue;
+    }
+    return (uint32_t)u64;
+}
+
+
+/**
+ * Reads a signed LEB128 encoded number, max 32-bit width.
+ *
+ * @returns signed 32-bit number. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   sErrValue           The value to return on error.
+ */
+static int32_t rtDwarfCursor_GetSLeb128AsS32(PRTDWARFCURSOR pCursor, int32_t sErrValue)
+{
+    int64_t s64 = rtDwarfCursor_GetSLeb128(pCursor, sErrValue);
+    if (s64 > INT32_MAX || s64 < INT32_MIN)
+    {
+        pCursor->rc = VERR_DWARF_LEB_OVERFLOW;
+        return sErrValue;
+    }
+    return (int32_t)s64;
+}
+
+
+/**
+ * Skips a LEB128 encoded number.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor             The cursor.
+ */
+static int rtDwarfCursor_SkipLeb128(PRTDWARFCURSOR pCursor)
+{
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+
+    if (pCursor->cbUnitLeft < 1)
+        return pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+
+    uint32_t offSkip = 1;
+    if (pCursor->pb[0] & 0x80)
+        do
+        {
+            if (offSkip == pCursor->cbUnitLeft)
+            {
+                pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+                break;
+            }
+        } while (pCursor->pb[offSkip++] & 0x80);
+
+    pCursor->pb         += offSkip;
+    pCursor->cbUnitLeft -= offSkip;
+    pCursor->cbLeft     -= offSkip;
+    return pCursor->rc;
+}
+
+
+/**
+ * Advances the cursor a given number of bytes.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor             The cursor.
+ * @param   offSkip             The number of bytes to advance.
+ */
+static int rtDwarfCursor_SkipBytes(PRTDWARFCURSOR pCursor, uint64_t offSkip)
+{
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+    if (pCursor->cbUnitLeft < offSkip)
+        return pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+
+    size_t const offSkipSizeT = (size_t)offSkip;
+    pCursor->cbUnitLeft -= offSkipSizeT;
+    pCursor->cbLeft     -= offSkipSizeT;
+    pCursor->pb         += offSkipSizeT;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Reads a zero terminated string, advancing the cursor beyond the terminator.
+ *
+ * @returns Pointer to the string.
+ * @param   pCursor             The cursor.
+ * @param   pszErrValue         What to return if the string isn't terminated
+ *                              before the end of the unit.
+ */
+static const char *rtDwarfCursor_GetSZ(PRTDWARFCURSOR pCursor, const char *pszErrValue)
+{
+    const char *pszRet = (const char *)pCursor->pb;
+    for (;;)
+    {
+        if (!pCursor->cbUnitLeft)
+        {
+            pCursor->rc = VERR_DWARF_BAD_STRING;
+            return pszErrValue;
+        }
+        pCursor->cbUnitLeft--;
+        pCursor->cbLeft--;
+        if (!*pCursor->pb++)
+            break;
+    }
+    return pszRet;
+}
+
+
+/**
+ * Reads a 1, 2, 4 or 8 byte unsigned value.
+ *
+ * @returns 64-bit unsigned value.
+ * @param   pCursor             The cursor.
+ * @param   cbValue             The value size.
+ * @param   uErrValue           The error value.
+ */
+static uint64_t rtDwarfCursor_GetVarSizedU(PRTDWARFCURSOR pCursor, size_t cbValue, uint64_t uErrValue)
+{
+    uint64_t u64Ret;
+    switch (cbValue)
+    {
+        case 1: u64Ret = rtDwarfCursor_GetU8( pCursor, UINT8_MAX); break;
+        case 2: u64Ret = rtDwarfCursor_GetU16(pCursor, UINT16_MAX); break;
+        case 4: u64Ret = rtDwarfCursor_GetU32(pCursor, UINT32_MAX); break;
+        case 8: u64Ret = rtDwarfCursor_GetU64(pCursor, UINT64_MAX); break;
+        default:
+            pCursor->rc = VERR_DWARF_BAD_INFO;
+            return uErrValue;
+    }
+    if (RT_FAILURE(pCursor->rc))
+        return uErrValue;
+    return u64Ret;
+}
+
+
+#if 0 /* unused */
+/**
+ * Gets the pointer to a variable size block and advances the cursor.
+ *
+ * @returns Pointer to the block at the current cursor location. On error
+ *          RTDWARFCURSOR::rc is set and NULL returned.
+ * @param   pCursor             The cursor.
+ * @param   cbBlock             The block size.
+ */
+static const uint8_t *rtDwarfCursor_GetBlock(PRTDWARFCURSOR pCursor, uint32_t cbBlock)
+{
+    if (cbBlock > pCursor->cbUnitLeft)
+    {
+        pCursor->rc = VERR_DWARF_UNEXPECTED_END;
+        return NULL;
+    }
+
+    uint8_t const *pb = &pCursor->pb[0];
+    pCursor->pb         += cbBlock;
+    pCursor->cbUnitLeft -= cbBlock;
+    pCursor->cbLeft     -= cbBlock;
+    return pb;
+}
+#endif
+
+
+/**
+ * Reads an unsigned DWARF half number.
+ *
+ * @returns The number. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           What to return on error.
+ */
+static uint16_t rtDwarfCursor_GetUHalf(PRTDWARFCURSOR pCursor, uint16_t uErrValue)
+{
+    return rtDwarfCursor_GetU16(pCursor, uErrValue);
+}
+
+
+/**
+ * Reads an unsigned DWARF byte number.
+ *
+ * @returns The number. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           What to return on error.
+ */
+static uint8_t rtDwarfCursor_GetUByte(PRTDWARFCURSOR pCursor, uint8_t uErrValue)
+{
+    return rtDwarfCursor_GetU8(pCursor, uErrValue);
+}
+
+
+/**
+ * Reads a signed DWARF byte number.
+ *
+ * @returns The number. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   iErrValue           What to return on error.
+ */
+static int8_t rtDwarfCursor_GetSByte(PRTDWARFCURSOR pCursor, int8_t iErrValue)
+{
+    return (int8_t)rtDwarfCursor_GetU8(pCursor, (uint8_t)iErrValue);
+}
+
+
+/**
+ * Reads a unsigned DWARF offset value.
+ *
+ * @returns The value. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           What to return on error.
+ */
+static uint64_t rtDwarfCursor_GetUOff(PRTDWARFCURSOR pCursor, uint64_t uErrValue)
+{
+    if (pCursor->f64bitDwarf)
+        return rtDwarfCursor_GetU64(pCursor, uErrValue);
+    return rtDwarfCursor_GetU32(pCursor, (uint32_t)uErrValue);
+}
+
+
+/**
+ * Reads a unsigned DWARF native offset value.
+ *
+ * @returns The value. On error RTDWARFCURSOR::rc is set and @a
+ *          uErrValue is returned.
+ * @param   pCursor             The cursor.
+ * @param   uErrValue           What to return on error.
+ */
+static uint64_t rtDwarfCursor_GetNativeUOff(PRTDWARFCURSOR pCursor, uint64_t uErrValue)
+{
+    switch (pCursor->cbNativeAddr)
+    {
+        case 1: return rtDwarfCursor_GetU8(pCursor,  (uint8_t )uErrValue);
+        case 2: return rtDwarfCursor_GetU16(pCursor, (uint16_t)uErrValue);
+        case 4: return rtDwarfCursor_GetU32(pCursor, (uint32_t)uErrValue);
+        case 8: return rtDwarfCursor_GetU64(pCursor, uErrValue);
+        default:
+            pCursor->rc = VERR_INTERNAL_ERROR_2;
+            return uErrValue;
+    }
+}
+
+
+/**
+ * Reads a 1, 2, 4 or 8 byte unsigned value.
+ *
+ * @returns 64-bit unsigned value.
+ * @param   pCursor             The cursor.
+ * @param   bPtrEnc             The pointer encoding.
+ * @param   uErrValue           The error value.
+ */
+static uint64_t rtDwarfCursor_GetPtrEnc(PRTDWARFCURSOR pCursor, uint8_t bPtrEnc, uint64_t uErrValue)
+{
+    uint64_t u64Ret;
+    switch (bPtrEnc & DW_EH_PE_FORMAT_MASK)
+    {
+        case DW_EH_PE_ptr:
+            u64Ret = rtDwarfCursor_GetNativeUOff(pCursor, uErrValue);
+            break;
+        case DW_EH_PE_uleb128:
+            u64Ret = rtDwarfCursor_GetULeb128(pCursor, uErrValue);
+            break;
+        case DW_EH_PE_udata2:
+            u64Ret = rtDwarfCursor_GetU16(pCursor, UINT16_MAX);
+            break;
+        case DW_EH_PE_udata4:
+            u64Ret = rtDwarfCursor_GetU32(pCursor, UINT32_MAX);
+            break;
+        case DW_EH_PE_udata8:
+            u64Ret = rtDwarfCursor_GetU64(pCursor, UINT64_MAX);
+            break;
+        case DW_EH_PE_sleb128:
+            u64Ret = rtDwarfCursor_GetSLeb128(pCursor, uErrValue);
+            break;
+        case DW_EH_PE_sdata2:
+            u64Ret = (int64_t)(int16_t)rtDwarfCursor_GetU16(pCursor, UINT16_MAX);
+            break;
+        case DW_EH_PE_sdata4:
+            u64Ret = (int64_t)(int32_t)rtDwarfCursor_GetU32(pCursor, UINT32_MAX);
+            break;
+        case DW_EH_PE_sdata8:
+            u64Ret = rtDwarfCursor_GetU64(pCursor, UINT64_MAX);
+            break;
+        default:
+            pCursor->rc = VERR_DWARF_BAD_INFO;
+            return uErrValue;
+    }
+    if (RT_FAILURE(pCursor->rc))
+        return uErrValue;
+    return u64Ret;
+}
+
+
+/**
+ * Gets the unit length, updating the unit length member and DWARF bitness
+ * members of the cursor.
+ *
+ * @returns The unit length.
+ * @param   pCursor             The cursor.
+ */
+static uint64_t rtDwarfCursor_GetInitialLength(PRTDWARFCURSOR pCursor)
+{
+    /*
+     * Read the initial length.
+     */
+    pCursor->cbUnitLeft = pCursor->cbLeft;
+    uint64_t cbUnit = rtDwarfCursor_GetU32(pCursor, 0);
+    if (cbUnit != UINT32_C(0xffffffff))
+        pCursor->f64bitDwarf = false;
+    else
+    {
+        pCursor->f64bitDwarf = true;
+        cbUnit = rtDwarfCursor_GetU64(pCursor, 0);
+    }
+
+
+    /*
+     * Set the unit length, quitely fixing bad lengths.
+     */
+    pCursor->cbUnitLeft = (size_t)cbUnit;
+    if (   pCursor->cbUnitLeft > pCursor->cbLeft
+        || pCursor->cbUnitLeft != cbUnit)
+        pCursor->cbUnitLeft = pCursor->cbLeft;
+
+    return cbUnit;
+}
+
+
+/**
+ * Calculates the section offset corresponding to the current cursor position.
+ *
+ * @returns 32-bit section offset. If out of range, RTDWARFCURSOR::rc will be
+ *          set and UINT32_MAX returned.
+ * @param   pCursor             The cursor.
+ */
+static uint32_t rtDwarfCursor_CalcSectOffsetU32(PRTDWARFCURSOR pCursor)
+{
+    size_t off = pCursor->pb - pCursor->pbStart;
+    uint32_t offRet = (uint32_t)off;
+    if (offRet != off)
+    {
+        AssertFailed();
+        pCursor->rc = VERR_OUT_OF_RANGE;
+        offRet = UINT32_MAX;
+    }
+    return offRet;
+}
+
+
+/**
+ * Calculates an absolute cursor position from one relative to the current
+ * cursor position.
+ *
+ * @returns The absolute cursor position.
+ * @param   pCursor             The cursor.
+ * @param   offRelative         The relative position.  Must be a positive
+ *                              offset.
+ */
+static uint8_t const *rtDwarfCursor_CalcPos(PRTDWARFCURSOR pCursor, size_t offRelative)
+{
+    if (offRelative > pCursor->cbUnitLeft)
+    {
+        Log(("rtDwarfCursor_CalcPos: bad position %#zx, cbUnitLeft=%#zu\n", offRelative, pCursor->cbUnitLeft));
+        pCursor->rc = VERR_DWARF_BAD_POS;
+        return NULL;
+    }
+    return pCursor->pb + offRelative;
+}
+
+
+/**
+ * Advances the cursor to the given position.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor             The cursor.
+ * @param   pbNewPos            The new position - returned by
+ *                              rtDwarfCursor_CalcPos().
+ */
+static int rtDwarfCursor_AdvanceToPos(PRTDWARFCURSOR pCursor, uint8_t const *pbNewPos)
+{
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+    AssertPtr(pbNewPos);
+    if ((uintptr_t)pbNewPos < (uintptr_t)pCursor->pb)
+    {
+        Log(("rtDwarfCursor_AdvanceToPos: bad position %p, current %p\n", pbNewPos, pCursor->pb));
+        return pCursor->rc = VERR_DWARF_BAD_POS;
+    }
+
+    uintptr_t cbAdj = (uintptr_t)pbNewPos - (uintptr_t)pCursor->pb;
+    if (RT_UNLIKELY(cbAdj > pCursor->cbUnitLeft))
+    {
+        AssertFailed();
+        pCursor->rc = VERR_DWARF_BAD_POS;
+        cbAdj = pCursor->cbUnitLeft;
+    }
+
+    pCursor->cbUnitLeft -= cbAdj;
+    pCursor->cbLeft     -= cbAdj;
+    pCursor->pb         += cbAdj;
+    return pCursor->rc;
+}
+
+
+/**
+ * Check if the cursor is at the end of the current DWARF unit.
+ *
+ * @retval  true if at the end or a cursor error is pending.
+ * @retval  false if not.
+ * @param   pCursor             The cursor.
+ */
+static bool rtDwarfCursor_IsAtEndOfUnit(PRTDWARFCURSOR pCursor)
+{
+    return !pCursor->cbUnitLeft || RT_FAILURE(pCursor->rc);
+}
+
+
+/**
+ * Skips to the end of the current unit.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor             The cursor.
+ */
+static int rtDwarfCursor_SkipUnit(PRTDWARFCURSOR pCursor)
+{
+    pCursor->pb        += pCursor->cbUnitLeft;
+    pCursor->cbLeft    -= pCursor->cbUnitLeft;
+    pCursor->cbUnitLeft = 0;
+    return pCursor->rc;
+}
+
+
+/**
+ * Check if the cursor is at the end of the section (or whatever the cursor is
+ * processing).
+ *
+ * @retval  true if at the end or a cursor error is pending.
+ * @retval  false if not.
+ * @param   pCursor             The cursor.
+ */
+static bool rtDwarfCursor_IsAtEnd(PRTDWARFCURSOR pCursor)
+{
+    return !pCursor->cbLeft || RT_FAILURE(pCursor->rc);
+}
+
+
+/**
+ * Initialize a section reader cursor.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor             The cursor.
+ * @param   pThis               The dwarf module.
+ * @param   enmSect             The name of the section to read.
+ */
+static int rtDwarfCursor_Init(PRTDWARFCURSOR pCursor, PRTDBGMODDWARF pThis, krtDbgModDwarfSect enmSect)
+{
+    int rc = rtDbgModDwarfLoadSection(pThis, enmSect);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    pCursor->enmSect          = enmSect;
+    pCursor->pbStart          = (uint8_t const *)pThis->aSections[enmSect].pv;
+    pCursor->pb               = pCursor->pbStart;
+    pCursor->cbLeft           = pThis->aSections[enmSect].cb;
+    pCursor->cbUnitLeft       = pCursor->cbLeft;
+    pCursor->pDwarfMod        = pThis;
+    pCursor->f64bitDwarf      = false;
+    /** @todo ask the image about the endian used as well as the address
+     *        width. */
+    pCursor->fNativEndian     = true;
+    pCursor->cbNativeAddr     = 4;
+    pCursor->rc               = VINF_SUCCESS;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Initialize a section reader cursor with a skip offset.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor             The cursor.
+ * @param   pThis               The dwarf module.
+ * @param   enmSect             The name of the section to read.
+ * @param   offSect             The offset to skip into the section.
+ */
+static int rtDwarfCursor_InitWithOffset(PRTDWARFCURSOR pCursor, PRTDBGMODDWARF pThis,
+                                        krtDbgModDwarfSect enmSect, uint32_t offSect)
+{
+    if (offSect > pThis->aSections[enmSect].cb)
+    {
+        Log(("rtDwarfCursor_InitWithOffset: offSect=%#x cb=%#x enmSect=%d\n", offSect, pThis->aSections[enmSect].cb, enmSect));
+        return VERR_DWARF_BAD_POS;
+    }
+
+    int rc = rtDwarfCursor_Init(pCursor, pThis, enmSect);
+    if (RT_SUCCESS(rc))
+    {
+        /* pCursor->pbStart += offSect; - we're skipping, offsets are relative to start of section... */
+        pCursor->pb         += offSect;
+        pCursor->cbLeft     -= offSect;
+        pCursor->cbUnitLeft -= offSect;
+    }
+
+    return rc;
+}
+
+
+/**
+ * Initialize a cursor for a block (subsection) retrieved from the given cursor.
+ *
+ * The parent cursor will be advanced past the block.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor             The cursor.
+ * @param   pParent             The parent cursor. Will be moved by @a cbBlock.
+ * @param   cbBlock             The size of the block the new cursor should
+ *                              cover.
+ */
+static int rtDwarfCursor_InitForBlock(PRTDWARFCURSOR pCursor, PRTDWARFCURSOR pParent, uint32_t cbBlock)
+{
+    if (RT_FAILURE(pParent->rc))
+        return pParent->rc;
+    if (pParent->cbUnitLeft < cbBlock)
+    {
+        Log(("rtDwarfCursor_InitForBlock: cbUnitLeft=%#x < cbBlock=%#x \n", pParent->cbUnitLeft, cbBlock));
+        return VERR_DWARF_BAD_POS;
+    }
+
+    *pCursor = *pParent;
+    pCursor->cbLeft     = cbBlock;
+    pCursor->cbUnitLeft = cbBlock;
+
+    pParent->pb         += cbBlock;
+    pParent->cbLeft     -= cbBlock;
+    pParent->cbUnitLeft -= cbBlock;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Initialize a reader cursor for a memory block (eh_frame).
+ *
+ * @returns IPRT status code.
+ * @param   pCursor             The cursor.
+ * @param   pvMem               The memory block.
+ * @param   cbMem               The size of the memory block.
+ */
+static int rtDwarfCursor_InitForMem(PRTDWARFCURSOR pCursor, void const *pvMem, size_t cbMem)
+{
+    pCursor->enmSect          = krtDbgModDwarfSect_End;
+    pCursor->pbStart          = (uint8_t const *)pvMem;
+    pCursor->pb               = (uint8_t const *)pvMem;
+    pCursor->cbLeft           = cbMem;
+    pCursor->cbUnitLeft       = cbMem;
+    pCursor->pDwarfMod        = NULL;
+    pCursor->f64bitDwarf      = false;
+    /** @todo ask the image about the endian used as well as the address
+     *        width. */
+    pCursor->fNativEndian     = true;
+    pCursor->cbNativeAddr     = 4;
+    pCursor->rc               = VINF_SUCCESS;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Deletes a section reader initialized by rtDwarfCursor_Init.
+ *
+ * @returns @a rcOther or RTDWARCURSOR::rc.
+ * @param   pCursor             The section reader.
+ * @param   rcOther             Other error code to be returned if it indicates
+ *                              error or if the cursor status is OK.
+ */
+static int rtDwarfCursor_Delete(PRTDWARFCURSOR pCursor, int rcOther)
+{
+    /* ... and a drop of poison. */
+    pCursor->pb         = NULL;
+    pCursor->cbLeft     = ~(size_t)0;
+    pCursor->cbUnitLeft = ~(size_t)0;
+    pCursor->pDwarfMod  = NULL;
+    if (RT_FAILURE(pCursor->rc) && RT_SUCCESS(rcOther))
+        rcOther = pCursor->rc;
+    pCursor->rc         = VERR_INTERNAL_ERROR_4;
+    return rcOther;
+}
+
+
+/*
+ *
+ * DWARF Frame Unwind Information.
+ * DWARF Frame Unwind Information.
+ * DWARF Frame Unwind Information.
+ *
+ */
+
+/**
+ * Common information entry (CIE) information.
+ */
+typedef struct RTDWARFCIEINFO
+{
+    /** The segment location of the CIE. */
+    uint64_t        offCie;
+    /** The DWARF version. */
+    uint8_t         uDwarfVer;
+    /** The address pointer encoding. */
+    uint8_t         bAddressPtrEnc;
+    /** The segment size (v4). */
+    uint8_t         cbSegment;
+    /** The return register column.  UINT8_MAX if default register. */
+    uint8_t         bRetReg;
+    /** The LSDA pointer encoding. */
+    uint8_t         bLsdaPtrEnc;
+
+    /** Set if the EH data field is present ('eh'). */
+    bool            fHasEhData : 1;
+    /** Set if there is an augmentation data size ('z'). */
+    bool            fHasAugmentationSize : 1;
+    /** Set if the augmentation data contains a LSDA (pointer size byte in CIE,
+     * pointer in FDA) ('L'). */
+    bool            fHasLanguageSpecificDataArea : 1;
+    /** Set if the augmentation data contains a personality routine
+     * (pointer size + pointer) ('P'). */
+    bool            fHasPersonalityRoutine : 1;
+    /** Set if the augmentation data contains the address encoding . */
+    bool            fHasAddressEnc : 1;
+    /** Set if signal frame. */
+    bool            fIsSignalFrame : 1;
+    /** Set if we've encountered unknown augmentation data.  This
+     * means the CIE is incomplete and cannot be used. */
+    bool            fHasUnknowAugmentation : 1;
+
+    /** Copy of the augmentation string. */
+    const char     *pszAugmentation;
+
+    /** Code alignment factor for the instruction. */
+    uint64_t        uCodeAlignFactor;
+    /** Data alignment factor for the instructions. */
+    int64_t         iDataAlignFactor;
+
+    /** Pointer to the instruction sequence. */
+    uint8_t const  *pbInstructions;
+    /** The length of the instruction sequence. */
+    size_t          cbInstructions;
+} RTDWARFCIEINFO;
+/** Pointer to CIE info. */
+typedef RTDWARFCIEINFO *PRTDWARFCIEINFO;
+/** Pointer to const CIE info. */
+typedef RTDWARFCIEINFO const *PCRTDWARFCIEINFO;
+
+
+/** Number of registers we care about.
+ * @note We're currently not expecting to be decoding ppc, arm, ia64 or such,
+ *       only x86 and x86_64.  We can easily increase the column count. */
+#define RTDWARFCF_MAX_REGISTERS         96
+
+
+/**
+ * Call frame state row.
+ */
+typedef struct RTDWARFCFROW
+{
+    /** Stack worked by DW_CFA_remember_state and DW_CFA_restore_state. */
+    struct RTDWARFCFROW    *pNextOnStack;
+
+    /** @name CFA - Canonical frame address expression.
+     * Since there are partial CFA instructions, we cannot be lazy like with the
+     * register but keep register+offset around.  For DW_CFA_def_cfa_expression
+     * we just take down the program location, though.
+     * @{ */
+    /** Pointer to DW_CFA_def_cfa_expression instruction, NULL if reg+offset. */
+    uint8_t const          *pbCfaExprInstr;
+    /** The CFA register offset. */
+    int64_t                 offCfaReg;
+    /** The CFA base register number. */
+    uint16_t                uCfaBaseReg;
+    /** Set if we've got a valid CFA definition. */
+    bool                    fCfaDefined : 1;
+    /** @} */
+
+    /** Set if on the heap and needs freeing. */
+    bool                    fOnHeap : 1;
+    /** Pointer to the instructions bytes defining registers.
+     * NULL means  */
+    uint8_t const          *apbRegInstrs[RTDWARFCF_MAX_REGISTERS];
+} RTDWARFCFROW;
+typedef RTDWARFCFROW *PRTDWARFCFROW;
+typedef RTDWARFCFROW const *PCRTDWARFCFROW;
+
+/** Row program execution state. */
+typedef struct RTDWARFCFEXEC
+{
+    PRTDWARFCFROW       pRow;
+    /** Number of PC bytes left to advance before we get a hit. */
+    uint64_t            cbLeftToAdvance;
+    /** Number of pushed rows. */
+    uint32_t            cPushes;
+    /** Set if little endian, clear if big endian. */
+    bool                fLittleEndian;
+    /** The CIE.  */
+    PCRTDWARFCIEINFO    pCie;
+    /** The program counter value for the FDE.  Subjected to segment.
+     * Needed for DW_CFA_set_loc.  */
+    uint64_t            uPcBegin;
+    /** The offset relative to uPcBegin for which we're searching for a row.
+     * Needed for DW_CFA_set_loc.  */
+    uint64_t            offInRange;
+} RTDWARFCFEXEC;
+typedef RTDWARFCFEXEC *PRTDWARFCFEXEC;
+
+
+/* Set of macros for getting and skipping operands. */
+#define SKIP_ULEB128_OR_LEB128() \
+    do \
+    { \
+        AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO); \
+    } while (pbInstr[offInstr++] & 0x80)
+
+#define GET_ULEB128_AS_U14(a_uDst) \
+    do \
+    { \
+        AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO); \
+        uint8_t b = pbInstr[offInstr++]; \
+        (a_uDst) = b & 0x7f; \
+        if (b & 0x80) \
+        { \
+            AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO); \
+            b = pbInstr[offInstr++]; \
+            AssertReturn(!(b & 0x80), VERR_DBG_MALFORMED_UNWIND_INFO); \
+            (a_uDst) |= (uint16_t)b << 7; \
+        } \
+    } while (0)
+#define GET_ULEB128_AS_U63(a_uDst) \
+    do \
+    { \
+        AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO); \
+        uint8_t b = pbInstr[offInstr++]; \
+        (a_uDst) = b & 0x7f; \
+        if (b & 0x80) \
+        { \
+            unsigned cShift = 7; \
+            do \
+            { \
+                AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO); \
+                AssertReturn(cShift < 63, VERR_DWARF_LEB_OVERFLOW); \
+                b = pbInstr[offInstr++]; \
+                (a_uDst) |= (uint16_t)(b & 0x7f) << cShift; \
+                cShift += 7; \
+            } while (b & 0x80); \
+        } \
+    } while (0)
+#define GET_LEB128_AS_I63(a_uDst) \
+    do \
+    { \
+        AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO); \
+        uint8_t b = pbInstr[offInstr++]; \
+        if (!(b & 0x80)) \
+            (a_uDst) = !(b & 0x40) ? b : (int64_t)(int8_t)(b | 0x80); \
+        else \
+        { \
+            /* Read value into unsigned variable: */ \
+            unsigned cShift = 7; \
+            uint64_t uTmp   = b & 0x7f; \
+            do \
+            { \
+                AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO); \
+                AssertReturn(cShift < 63, VERR_DWARF_LEB_OVERFLOW); \
+                b = pbInstr[offInstr++]; \
+                uTmp |= (uint16_t)(b & 0x7f) << cShift; \
+                cShift += 7; \
+            } while (b & 0x80); \
+            /* Sign extend before setting the destination value: */ \
+            cShift -= 7 + 1; \
+            if (uTmp & RT_BIT_64(cShift)) \
+                uTmp |= ~(RT_BIT_64(cShift) - 1); \
+            (a_uDst) = (int64_t)uTmp; \
+        } \
+    } while (0)
+
+#define SKIP_BLOCK() \
+    do \
+    { \
+        uint16_t cbBlock; \
+        GET_ULEB128_AS_U14(cbBlock); \
+        AssertReturn(offInstr + cbBlock <= cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO); \
+        offInstr += cbBlock; \
+    } while (0)
+
+
+static int rtDwarfUnwind_Execute(PRTDWARFCFEXEC pExecState, uint8_t const *pbInstr, uint32_t cbInstr)
+{
+    PRTDWARFCFROW pRow = pExecState->pRow;
+    for (uint32_t offInstr = 0; offInstr < cbInstr;)
+    {
+        /*
+         * Instruction switches.
+         */
+        uint8_t const bInstr = pbInstr[offInstr++];
+        switch (bInstr & DW_CFA_high_bit_mask)
+        {
+            case DW_CFA_advance_loc:
+            {
+                uint8_t const cbAdvance = bInstr & ~DW_CFA_high_bit_mask;
+                if (cbAdvance > pExecState->cbLeftToAdvance)
+                    return VINF_SUCCESS;
+                pExecState->cbLeftToAdvance -= cbAdvance;
+                break;
+            }
+
+            case DW_CFA_offset:
+            {
+                uint8_t iReg = bInstr & ~DW_CFA_high_bit_mask;
+                if (iReg < RT_ELEMENTS(pRow->apbRegInstrs))
+                    pRow->apbRegInstrs[iReg] = &pbInstr[offInstr - 1];
+                SKIP_ULEB128_OR_LEB128();
+                break;
+            }
+
+            case 0:
+                switch (bInstr)
+                {
+                    case DW_CFA_nop:
+                        break;
+
+                    /*
+                     * Register instructions.
+                     */
+                    case DW_CFA_register:
+                    case DW_CFA_offset_extended:
+                    case DW_CFA_offset_extended_sf:
+                    case DW_CFA_val_offset:
+                    case DW_CFA_val_offset_sf:
+                    {
+                        uint8_t const * const pbCurInstr = &pbInstr[offInstr - 1];
+                        uint16_t              iReg;
+                        GET_ULEB128_AS_U14(iReg);
+                        if (iReg < RT_ELEMENTS(pRow->apbRegInstrs))
+                            pRow->apbRegInstrs[iReg] = pbCurInstr;
+                        SKIP_ULEB128_OR_LEB128();
+                        break;
+                    }
+
+                    case DW_CFA_expression:
+                    case DW_CFA_val_expression:
+                    {
+                        uint8_t const * const pbCurInstr = &pbInstr[offInstr - 1];
+                        uint16_t              iReg;
+                        GET_ULEB128_AS_U14(iReg);
+                        if (iReg < RT_ELEMENTS(pRow->apbRegInstrs))
+                            pRow->apbRegInstrs[iReg] = pbCurInstr;
+                        SKIP_BLOCK();
+                        break;
+                    }
+
+                    case DW_CFA_restore_extended:
+                    {
+                        uint8_t const * const pbCurInstr = &pbInstr[offInstr - 1];
+                        uint16_t              iReg;
+                        GET_ULEB128_AS_U14(iReg);
+                        if (iReg < RT_ELEMENTS(pRow->apbRegInstrs))
+                            pRow->apbRegInstrs[iReg] = pbCurInstr;
+                        break;
+                    }
+
+                    case DW_CFA_undefined:
+                    {
+                        uint16_t iReg;
+                        GET_ULEB128_AS_U14(iReg);
+                        if (iReg < RT_ELEMENTS(pRow->apbRegInstrs))
+                            pRow->apbRegInstrs[iReg] = NULL;
+                        break;
+                    }
+
+                    case DW_CFA_same_value:
+                    {
+                        uint8_t const * const pbCurInstr = &pbInstr[offInstr - 1];
+                        uint16_t              iReg;
+                        GET_ULEB128_AS_U14(iReg);
+                        if (iReg < RT_ELEMENTS(pRow->apbRegInstrs))
+                            pRow->apbRegInstrs[iReg] = pbCurInstr;
+                        break;
+                    }
+
+
+                    /*
+                     * CFA instructions.
+                     */
+                    case DW_CFA_def_cfa:
+                    {
+                        GET_ULEB128_AS_U14(pRow->uCfaBaseReg);
+                        uint64_t offCfaReg;
+                        GET_ULEB128_AS_U63(offCfaReg);
+                        pRow->offCfaReg        = offCfaReg;
+                        pRow->pbCfaExprInstr   = NULL;
+                        pRow->fCfaDefined      = true;
+                        break;
+                    }
+
+                    case DW_CFA_def_cfa_register:
+                    {
+                        GET_ULEB128_AS_U14(pRow->uCfaBaseReg);
+                        pRow->pbCfaExprInstr   = NULL;
+                        pRow->fCfaDefined      = true;
+                        /* Leaves offCfaReg as is. */
+                        break;
+                    }
+
+                    case DW_CFA_def_cfa_offset:
+                    {
+                        uint64_t offCfaReg;
+                        GET_ULEB128_AS_U63(offCfaReg);
+                        pRow->offCfaReg        = offCfaReg;
+                        pRow->pbCfaExprInstr   = NULL;
+                        pRow->fCfaDefined      = true;
+                        /* Leaves uCfaBaseReg as is. */
+                        break;
+                    }
+
+                    case DW_CFA_def_cfa_sf:
+                        GET_ULEB128_AS_U14(pRow->uCfaBaseReg);
+                        GET_LEB128_AS_I63(pRow->offCfaReg);
+                        pRow->pbCfaExprInstr   = NULL;
+                        pRow->fCfaDefined      = true;
+                        break;
+
+                    case DW_CFA_def_cfa_offset_sf:
+                        GET_LEB128_AS_I63(pRow->offCfaReg);
+                        pRow->pbCfaExprInstr   = NULL;
+                        pRow->fCfaDefined      = true;
+                        /* Leaves uCfaBaseReg as is. */
+                        break;
+
+                    case DW_CFA_def_cfa_expression:
+                        pRow->pbCfaExprInstr   = &pbInstr[offInstr - 1];
+                        pRow->fCfaDefined      = true;
+                        SKIP_BLOCK();
+                        break;
+
+                    /*
+                     * Less likely instructions:
+                     */
+                    case DW_CFA_advance_loc1:
+                    {
+                        AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                        uint8_t const cbAdvance = pbInstr[offInstr++];
+                        if (cbAdvance > pExecState->cbLeftToAdvance)
+                            return VINF_SUCCESS;
+                        pExecState->cbLeftToAdvance -= cbAdvance;
+                        break;
+                    }
+
+                    case DW_CFA_advance_loc2:
+                    {
+                        AssertReturn(offInstr + 1 < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                        uint16_t const cbAdvance = pExecState->fLittleEndian
+                                                 ? RT_MAKE_U16(pbInstr[offInstr], pbInstr[offInstr + 1])
+                                                 : RT_MAKE_U16(pbInstr[offInstr + 1], pbInstr[offInstr]);
+                        if (cbAdvance > pExecState->cbLeftToAdvance)
+                            return VINF_SUCCESS;
+                        pExecState->cbLeftToAdvance -= cbAdvance;
+                        offInstr += 2;
+                        break;
+                    }
+
+                    case DW_CFA_advance_loc4:
+                    {
+                        AssertReturn(offInstr + 3 < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                        uint32_t const cbAdvance = pExecState->fLittleEndian
+                                                 ? RT_MAKE_U32_FROM_U8(pbInstr[offInstr + 0], pbInstr[offInstr + 1],
+                                                                       pbInstr[offInstr + 2], pbInstr[offInstr + 3])
+                                                 : RT_MAKE_U32_FROM_U8(pbInstr[offInstr + 3], pbInstr[offInstr + 2],
+                                                                       pbInstr[offInstr + 1], pbInstr[offInstr + 0]);
+                        if (cbAdvance > pExecState->cbLeftToAdvance)
+                            return VINF_SUCCESS;
+                        pExecState->cbLeftToAdvance -= cbAdvance;
+                        offInstr += 4;
+                        break;
+                    }
+
+                    /*
+                     * This bugger is really annoying and probably never used.
+                     */
+                    case DW_CFA_set_loc:
+                    {
+                        /* Ignore the segment number. */
+                        if (pExecState->pCie->cbSegment)
+                        {
+                            offInstr += pExecState->pCie->cbSegment;
+                            AssertReturn(offInstr < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                        }
+
+                        /* Retrieve the address. sigh. */
+                        uint64_t uAddress;
+                        switch (pExecState->pCie->bAddressPtrEnc & (DW_EH_PE_FORMAT_MASK | DW_EH_PE_indirect))
+                        {
+                            case DW_EH_PE_udata2:
+                                AssertReturn(offInstr + 1 < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                                if (pExecState->fLittleEndian)
+                                    uAddress = RT_MAKE_U16(pbInstr[offInstr], pbInstr[offInstr + 1]);
+                                else
+                                    uAddress = RT_MAKE_U16(pbInstr[offInstr + 1], pbInstr[offInstr]);
+                                offInstr += 2;
+                                break;
+                            case DW_EH_PE_sdata2:
+                                AssertReturn(offInstr + 1 < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                                if (pExecState->fLittleEndian)
+                                    uAddress = (int64_t)(int16_t)RT_MAKE_U16(pbInstr[offInstr], pbInstr[offInstr + 1]);
+                                else
+                                    uAddress = (int64_t)(int16_t)RT_MAKE_U16(pbInstr[offInstr + 1], pbInstr[offInstr]);
+                                offInstr += 2;
+                                break;
+                            case DW_EH_PE_udata4:
+                                AssertReturn(offInstr + 3 < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                                if (pExecState->fLittleEndian)
+                                    uAddress = RT_MAKE_U32_FROM_U8(pbInstr[offInstr + 0], pbInstr[offInstr + 1],
+                                                                   pbInstr[offInstr + 2], pbInstr[offInstr + 3]);
+                                else
+                                    uAddress = RT_MAKE_U32_FROM_U8(pbInstr[offInstr + 3], pbInstr[offInstr + 2],
+                                                                   pbInstr[offInstr + 1], pbInstr[offInstr + 0]);
+
+                                offInstr += 4;
+                                break;
+                            case DW_EH_PE_sdata4:
+                                AssertReturn(offInstr + 3 < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                                if (pExecState->fLittleEndian)
+                                    uAddress = (int64_t)(int32_t)RT_MAKE_U32_FROM_U8(pbInstr[offInstr + 0], pbInstr[offInstr + 1],
+                                                                                     pbInstr[offInstr + 2], pbInstr[offInstr + 3]);
+                                else
+                                    uAddress = (int64_t)(int32_t)RT_MAKE_U32_FROM_U8(pbInstr[offInstr + 3], pbInstr[offInstr + 2],
+                                                                                     pbInstr[offInstr + 1], pbInstr[offInstr + 0]);
+                                offInstr += 4;
+                                break;
+                            case DW_EH_PE_udata8:
+                            case DW_EH_PE_sdata8:
+                                AssertReturn(offInstr + 7 < cbInstr, VERR_DBG_MALFORMED_UNWIND_INFO);
+                                if (pExecState->fLittleEndian)
+                                    uAddress = RT_MAKE_U64_FROM_U8(pbInstr[offInstr + 0], pbInstr[offInstr + 1],
+                                                                   pbInstr[offInstr + 2], pbInstr[offInstr + 3],
+                                                                   pbInstr[offInstr + 4], pbInstr[offInstr + 5],
+                                                                   pbInstr[offInstr + 6], pbInstr[offInstr + 7]);
+                                else
+                                    uAddress = RT_MAKE_U64_FROM_U8(pbInstr[offInstr + 7], pbInstr[offInstr + 6],
+                                                                   pbInstr[offInstr + 5], pbInstr[offInstr + 4],
+                                                                   pbInstr[offInstr + 3], pbInstr[offInstr + 2],
+                                                                   pbInstr[offInstr + 1], pbInstr[offInstr + 0]);
+                                offInstr += 8;
+                                break;
+                            case DW_EH_PE_sleb128:
+                            case DW_EH_PE_uleb128:
+                            default:
+                                AssertMsgFailedReturn(("%#x\n", pExecState->pCie->bAddressPtrEnc), VERR_DWARF_TODO);
+                        }
+                        AssertReturn(uAddress >= pExecState->uPcBegin, VERR_DBG_MALFORMED_UNWIND_INFO);
+
+                        /* Did we advance past the desire address already? */
+                        if (uAddress > pExecState->uPcBegin + pExecState->offInRange)
+                            return VINF_SUCCESS;
+                        pExecState->cbLeftToAdvance = pExecState->uPcBegin + pExecState->offInRange - uAddress;
+                        break;
+
+
+                        /*
+                         * Row state push/pop instructions.
+                         */
+
+                        case DW_CFA_remember_state:
+                        {
+                            AssertReturn(pExecState->cPushes < 10, VERR_DBG_MALFORMED_UNWIND_INFO);
+                            PRTDWARFCFROW pNewRow = (PRTDWARFCFROW)RTMemTmpAlloc(sizeof(*pNewRow));
+                            AssertReturn(pNewRow, VERR_NO_TMP_MEMORY);
+                            memcpy(pNewRow, pRow, sizeof(*pNewRow));
+                            pNewRow->pNextOnStack = pRow;
+                            pNewRow->fOnHeap      = true;
+                            pExecState->pRow      = pNewRow;
+                            pExecState->cPushes  += 1;
+                            pRow = pNewRow;
+                            break;
+                        }
+
+                        case DW_CFA_restore_state:
+                            AssertReturn(pRow->pNextOnStack, VERR_DBG_MALFORMED_UNWIND_INFO);
+                            Assert(pRow->fOnHeap);
+                            Assert(pExecState->cPushes > 0);
+                            pExecState->cPushes -= 1;
+                            pExecState->pRow     = pRow->pNextOnStack;
+                            RTMemTmpFree(pRow);
+                            pRow = pExecState->pRow;
+                            break;
+                    }
+                }
+                break;
+
+            case DW_CFA_restore:
+            {
+                uint8_t const * const pbCurInstr = &pbInstr[offInstr - 1];
+                uint8_t const         iReg       = bInstr & ~DW_CFA_high_bit_mask;
+                if (iReg < RT_ELEMENTS(pRow->apbRegInstrs))
+                    pRow->apbRegInstrs[iReg] = pbCurInstr;
+                break;
+            }
+        }
+    }
+    return VINF_TRY_AGAIN;
+}
+
+
+/**
+ * Register getter for AMD64.
+ *
+ * @returns true if found, false if not.
+ * @param   pState              The unwind state to get the register from.
+ * @param   iReg                The dwarf register number.
+ * @param   puValue             Where to store the register value.
+ */
+static bool rtDwarfUnwind_Amd64GetRegFromState(PCRTDBGUNWINDSTATE pState, uint16_t iReg, uint64_t *puValue)
+{
+    switch (iReg)
+    {
+        case DWREG_AMD64_RAX:       *puValue = pState->u.x86.auRegs[X86_GREG_xAX];  return true;
+        case DWREG_AMD64_RDX:       *puValue = pState->u.x86.auRegs[X86_GREG_xDX];  return true;
+        case DWREG_AMD64_RCX:       *puValue = pState->u.x86.auRegs[X86_GREG_xCX];  return true;
+        case DWREG_AMD64_RBX:       *puValue = pState->u.x86.auRegs[X86_GREG_xBX];  return true;
+        case DWREG_AMD64_RSI:       *puValue = pState->u.x86.auRegs[X86_GREG_xSI];  return true;
+        case DWREG_AMD64_RDI:       *puValue = pState->u.x86.auRegs[X86_GREG_xDI];  return true;
+        case DWREG_AMD64_RBP:       *puValue = pState->u.x86.auRegs[X86_GREG_xBP];  return true;
+        case DWREG_AMD64_RSP:       *puValue = pState->u.x86.auRegs[X86_GREG_xSP];  return true;
+        case DWREG_AMD64_R8:        *puValue = pState->u.x86.auRegs[X86_GREG_x8];   return true;
+        case DWREG_AMD64_R9:        *puValue = pState->u.x86.auRegs[X86_GREG_x9];   return true;
+        case DWREG_AMD64_R10:       *puValue = pState->u.x86.auRegs[X86_GREG_x10];  return true;
+        case DWREG_AMD64_R11:       *puValue = pState->u.x86.auRegs[X86_GREG_x11];  return true;
+        case DWREG_AMD64_R12:       *puValue = pState->u.x86.auRegs[X86_GREG_x12];  return true;
+        case DWREG_AMD64_R13:       *puValue = pState->u.x86.auRegs[X86_GREG_x13];  return true;
+        case DWREG_AMD64_R14:       *puValue = pState->u.x86.auRegs[X86_GREG_x14];  return true;
+        case DWREG_AMD64_R15:       *puValue = pState->u.x86.auRegs[X86_GREG_x15];  return true;
+        case DWREG_AMD64_RFLAGS:    *puValue = pState->u.x86.uRFlags;               return true;
+        case DWREG_AMD64_ES:        *puValue = pState->u.x86.auSegs[X86_SREG_ES];   return true;
+        case DWREG_AMD64_CS:        *puValue = pState->u.x86.auSegs[X86_SREG_CS];   return true;
+        case DWREG_AMD64_SS:        *puValue = pState->u.x86.auSegs[X86_SREG_SS];   return true;
+        case DWREG_AMD64_DS:        *puValue = pState->u.x86.auSegs[X86_SREG_DS];   return true;
+        case DWREG_AMD64_FS:        *puValue = pState->u.x86.auSegs[X86_SREG_FS];   return true;
+        case DWREG_AMD64_GS:        *puValue = pState->u.x86.auSegs[X86_SREG_GS];   return true;
+    }
+    return false;
+}
+
+
+/**
+ * Register getter for 386+.
+ *
+ * @returns true if found, false if not.
+ * @param   pState              The unwind state to get the register from.
+ * @param   iReg                The dwarf register number.
+ * @param   puValue             Where to store the register value.
+ */
+static bool rtDwarfUnwind_X86GetRegFromState(PCRTDBGUNWINDSTATE pState, uint16_t iReg, uint64_t *puValue)
+{
+    switch (iReg)
+    {
+        case DWREG_X86_EAX:         *puValue = pState->u.x86.auRegs[X86_GREG_xAX];  return true;
+        case DWREG_X86_ECX:         *puValue = pState->u.x86.auRegs[X86_GREG_xCX];  return true;
+        case DWREG_X86_EDX:         *puValue = pState->u.x86.auRegs[X86_GREG_xDX];  return true;
+        case DWREG_X86_EBX:         *puValue = pState->u.x86.auRegs[X86_GREG_xBX];  return true;
+        case DWREG_X86_ESP:         *puValue = pState->u.x86.auRegs[X86_GREG_xSP];  return true;
+        case DWREG_X86_EBP:         *puValue = pState->u.x86.auRegs[X86_GREG_xBP];  return true;
+        case DWREG_X86_ESI:         *puValue = pState->u.x86.auRegs[X86_GREG_xSI];  return true;
+        case DWREG_X86_EDI:         *puValue = pState->u.x86.auRegs[X86_GREG_xDI];  return true;
+        case DWREG_X86_EFLAGS:      *puValue = pState->u.x86.uRFlags;               return true;
+        case DWREG_X86_ES:          *puValue = pState->u.x86.auSegs[X86_SREG_ES];   return true;
+        case DWREG_X86_CS:          *puValue = pState->u.x86.auSegs[X86_SREG_CS];   return true;
+        case DWREG_X86_SS:          *puValue = pState->u.x86.auSegs[X86_SREG_SS];   return true;
+        case DWREG_X86_DS:          *puValue = pState->u.x86.auSegs[X86_SREG_DS];   return true;
+        case DWREG_X86_FS:          *puValue = pState->u.x86.auSegs[X86_SREG_FS];   return true;
+        case DWREG_X86_GS:          *puValue = pState->u.x86.auSegs[X86_SREG_GS];   return true;
+    }
+    return false;
+}
+
+/** Register getter. */
+typedef bool FNDWARFUNWINDGEREGFROMSTATE(PCRTDBGUNWINDSTATE pState, uint16_t iReg, uint64_t *puValue);
+/** Pointer to a register getter. */
+typedef FNDWARFUNWINDGEREGFROMSTATE *PFNDWARFUNWINDGEREGFROMSTATE;
+
+
+
+/**
+ * Does the heavy work for figuring out the return value of a register.
+ *
+ * @returns IPRT status code.
+ * @retval  VERR_NOT_FOUND if register is undefined.
+ *
+ * @param   pRow        The DWARF unwind table "row" to use.
+ * @param   uReg        The DWARF register number.
+ * @param   pCie        The corresponding CIE.
+ * @param   uCfa        The canonical frame address to use.
+ * @param   pState      The unwind to use when reading stack.
+ * @param   pOldState   The unwind state to get register values from.
+ * @param   pfnGetReg   The register value getter.
+ * @param   puValue     Where to store the return value.
+ * @param   cbValue     The size this register would have on the stack.
+ */
+static int rtDwarfUnwind_CalcRegisterValue(PRTDWARFCFROW pRow, unsigned uReg, PCRTDWARFCIEINFO pCie, uint64_t uCfa,
+                                           PRTDBGUNWINDSTATE pState, PCRTDBGUNWINDSTATE pOldState,
+                                           PFNDWARFUNWINDGEREGFROMSTATE pfnGetReg, uint64_t *puValue, uint8_t cbValue)
+{
+    Assert(uReg < RT_ELEMENTS(pRow->apbRegInstrs));
+    uint8_t const *pbInstr = pRow->apbRegInstrs[uReg];
+    if (!pbInstr)
+        return VERR_NOT_FOUND;
+
+    uint32_t      cbInstr  = UINT32_MAX / 2;
+    uint32_t      offInstr = 1;
+    uint8_t const bInstr   = *pbInstr;
+    switch (bInstr)
+    {
+        default:
+            if ((bInstr & DW_CFA_high_bit_mask) == DW_CFA_offset)
+            {
+                uint64_t offCfa;
+                GET_ULEB128_AS_U63(offCfa);
+                int rc = pState->pfnReadStack(pState, uCfa + (int64_t)offCfa * pCie->iDataAlignFactor, cbValue, puValue);
+                Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_offset %#RX64: %Rrc, %#RX64\n", uReg, uCfa + (int64_t)offCfa * pCie->iDataAlignFactor, rc, *puValue));
+                return rc;
+            }
+            AssertReturn((bInstr & DW_CFA_high_bit_mask) == DW_CFA_restore, VERR_INTERNAL_ERROR);
+            RT_FALL_THRU();
+        case DW_CFA_restore_extended:
+            /* Need to search the CIE for the rule. */
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_restore/extended:\n", uReg));
+            AssertFailedReturn(VERR_DWARF_TODO);
+
+        case DW_CFA_offset_extended:
+        {
+            SKIP_ULEB128_OR_LEB128();
+            uint64_t offCfa;
+            GET_ULEB128_AS_U63(offCfa);
+            int rc = pState->pfnReadStack(pState, uCfa + (int64_t)offCfa * pCie->iDataAlignFactor, cbValue, puValue);
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_offset_extended %#RX64: %Rrc, %#RX64\n", uReg, uCfa + (int64_t)offCfa * pCie->iDataAlignFactor, rc, *puValue));
+            return rc;
+        }
+
+        case DW_CFA_offset_extended_sf:
+        {
+            SKIP_ULEB128_OR_LEB128();
+            int64_t offCfa;
+            GET_LEB128_AS_I63(offCfa);
+            int rc = pState->pfnReadStack(pState, uCfa + offCfa * pCie->iDataAlignFactor, cbValue, puValue);
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_offset_extended_sf %#RX64: %Rrc, %#RX64\n", uReg, uCfa + offCfa * pCie->iDataAlignFactor, rc, *puValue));
+            return rc;
+        }
+
+        case DW_CFA_val_offset:
+        {
+            SKIP_ULEB128_OR_LEB128();
+            uint64_t offCfa;
+            GET_ULEB128_AS_U63(offCfa);
+            *puValue = uCfa + (int64_t)offCfa * pCie->iDataAlignFactor;
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_val_offset: %#RX64\n", uReg, *puValue));
+            return VINF_SUCCESS;
+        }
+
+        case DW_CFA_val_offset_sf:
+        {
+            SKIP_ULEB128_OR_LEB128();
+            int64_t offCfa;
+            GET_LEB128_AS_I63(offCfa);
+            *puValue = uCfa + offCfa * pCie->iDataAlignFactor;
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_val_offset_sf: %#RX64\n", uReg, *puValue));
+            return VINF_SUCCESS;
+        }
+
+        case DW_CFA_register:
+        {
+            SKIP_ULEB128_OR_LEB128();
+            uint16_t iSrcReg;
+            GET_ULEB128_AS_U14(iSrcReg);
+            if (pfnGetReg(pOldState, uReg, puValue))
+            {
+                Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_register: %#RX64\n", uReg, *puValue));
+                return VINF_SUCCESS;
+            }
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_register: VERR_NOT_FOUND\n", uReg));
+            return VERR_NOT_FOUND;
+        }
+
+        case DW_CFA_expression:
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_expression: TODO\n", uReg));
+            AssertFailedReturn(VERR_DWARF_TODO);
+
+        case DW_CFA_val_expression:
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_val_expression: TODO\n", uReg));
+            AssertFailedReturn(VERR_DWARF_TODO);
+
+        case DW_CFA_undefined:
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_undefined\n", uReg));
+            return VERR_NOT_FOUND;
+
+        case DW_CFA_same_value:
+            if (pfnGetReg(pOldState, uReg, puValue))
+            {
+                Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_same_value: %#RX64\n", uReg, *puValue));
+                return VINF_SUCCESS;
+            }
+            Log8(("rtDwarfUnwind_CalcRegisterValue(%#x): DW_CFA_same_value: VERR_NOT_FOUND\n", uReg));
+            return VERR_NOT_FOUND;
+    }
+}
+
+
+DECLINLINE(void) rtDwarfUnwind_UpdateX86GRegFromRow(PRTDBGUNWINDSTATE pState, PCRTDBGUNWINDSTATE pOldState, unsigned idxGReg,
+                                                    PRTDWARFCFROW pRow, unsigned idxDwReg, PCRTDWARFCIEINFO pCie,
+                                                    uint64_t uCfa, PFNDWARFUNWINDGEREGFROMSTATE pfnGetReg, uint8_t cbGReg)
+{
+    int rc = rtDwarfUnwind_CalcRegisterValue(pRow, idxDwReg, pCie, uCfa, pState, pOldState, pfnGetReg,
+                                             &pState->u.x86.auRegs[idxGReg], cbGReg);
+    if (RT_SUCCESS(rc))
+        pState->u.x86.Loaded.s.fRegs |= RT_BIT_32(idxGReg);
+}
+
+
+DECLINLINE(void) rtDwarfUnwind_UpdateX86SRegFromRow(PRTDBGUNWINDSTATE pState, PCRTDBGUNWINDSTATE pOldState, unsigned idxSReg,
+                                                    PRTDWARFCFROW pRow, unsigned idxDwReg, PCRTDWARFCIEINFO pCie,
+                                                    uint64_t uCfa, PFNDWARFUNWINDGEREGFROMSTATE pfnGetReg)
+{
+    uint64_t uValue = pState->u.x86.auSegs[idxSReg];
+    int rc = rtDwarfUnwind_CalcRegisterValue(pRow, idxDwReg, pCie, uCfa, pState, pOldState, pfnGetReg, &uValue, sizeof(uint16_t));
+    if (RT_SUCCESS(rc))
+    {
+        pState->u.x86.auSegs[idxSReg] = (uint16_t)uValue;
+        pState->u.x86.Loaded.s.fSegs |= RT_BIT_32(idxSReg);
+    }
+}
+
+
+DECLINLINE(void) rtDwarfUnwind_UpdateX86RFlagsFromRow(PRTDBGUNWINDSTATE pState, PCRTDBGUNWINDSTATE pOldState,
+                                                      PRTDWARFCFROW pRow, unsigned idxDwReg, PCRTDWARFCIEINFO pCie,
+                                                      uint64_t uCfa, PFNDWARFUNWINDGEREGFROMSTATE pfnGetReg)
+{
+    int rc = rtDwarfUnwind_CalcRegisterValue(pRow, idxDwReg, pCie, uCfa, pState, pOldState, pfnGetReg,
+                                             &pState->u.x86.uRFlags, sizeof(uint32_t));
+    if (RT_SUCCESS(rc))
+        pState->u.x86.Loaded.s.fRFlags = 1;
+}
+
+
+DECLINLINE(void) rtDwarfUnwind_UpdatePCFromRow(PRTDBGUNWINDSTATE pState, PCRTDBGUNWINDSTATE pOldState,
+                                               PRTDWARFCFROW pRow, unsigned idxDwReg, PCRTDWARFCIEINFO pCie,
+                                               uint64_t uCfa, PFNDWARFUNWINDGEREGFROMSTATE pfnGetReg, uint8_t cbPc)
+{
+    if (pCie->bRetReg != UINT8_MAX)
+        idxDwReg = pCie->bRetReg;
+    int rc = rtDwarfUnwind_CalcRegisterValue(pRow, idxDwReg, pCie, uCfa, pState, pOldState, pfnGetReg, &pState->uPc, cbPc);
+    if (RT_SUCCESS(rc))
+        pState->u.x86.Loaded.s.fPc = 1;
+    else
+    {
+        rc = pState->pfnReadStack(pState, uCfa - cbPc, cbPc, &pState->uPc);
+        if (RT_SUCCESS(rc))
+            pState->u.x86.Loaded.s.fPc = 1;
+    }
+}
+
+
+
+/**
+ * Updates @a pState with the rules found in @a pRow.
+ *
+ * @returns IPRT status code.
+ * @param   pState          The unwind state to update.
+ * @param   pRow            The "row" in the dwarf unwind table.
+ * @param   pCie            The CIE structure for the row.
+ * @param   enmImageArch    The image architecture.
+ */
+static int rtDwarfUnwind_UpdateStateFromRow(PRTDBGUNWINDSTATE pState, PRTDWARFCFROW pRow,
+                                            PCRTDWARFCIEINFO pCie, RTLDRARCH enmImageArch)
+{
+    /*
+     * We need to make a copy of the current state so we can get at the
+     * current register values while calculating the ones of the next frame.
+     */
+    RTDBGUNWINDSTATE const Old = *pState;
+
+    /*
+     * Get the register state getter.
+     */
+    PFNDWARFUNWINDGEREGFROMSTATE pfnGetReg;
+    switch (enmImageArch)
+    {
+        case RTLDRARCH_AMD64:
+            pfnGetReg = rtDwarfUnwind_Amd64GetRegFromState;
+            break;
+        case RTLDRARCH_X86_32:
+        case RTLDRARCH_X86_16:
+            pfnGetReg = rtDwarfUnwind_X86GetRegFromState;
+            break;
+        default:
+            return VERR_NOT_SUPPORTED;
+    }
+
+    /*
+     * Calc the canonical frame address for the current row.
+     */
+    AssertReturn(pRow->fCfaDefined, VERR_DBG_MALFORMED_UNWIND_INFO);
+    uint64_t uCfa = 0;
+    if (!pRow->pbCfaExprInstr)
+    {
+        pfnGetReg(&Old, pRow->uCfaBaseReg, &uCfa);
+        uCfa += pRow->offCfaReg;
+    }
+    else
+    {
+        AssertFailed();
+        return VERR_DWARF_TODO;
+    }
+    Log8(("rtDwarfUnwind_UpdateStateFromRow: uCfa=%RX64\n", uCfa));
+
+    /*
+     * Do the architecture specific register updating.
+     */
+    switch (enmImageArch)
+    {
+        case RTLDRARCH_AMD64:
+            pState->enmRetType = RTDBGRETURNTYPE_NEAR64;
+            pState->u.x86.FrameAddr.off       = uCfa - 8*2;
+            pState->u.x86.Loaded.fAll         = 0;
+            pState->u.x86.Loaded.s.fFrameAddr = 1;
+            rtDwarfUnwind_UpdatePCFromRow(pState, &Old,                    pRow, DWREG_AMD64_RA,  pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86RFlagsFromRow(pState, &Old,             pRow, DWREG_AMD64_RFLAGS, pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xAX, pRow, DWREG_AMD64_RAX, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xCX, pRow, DWREG_AMD64_RCX, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xDX, pRow, DWREG_AMD64_RDX, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xBX, pRow, DWREG_AMD64_RBX, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xSP, pRow, DWREG_AMD64_RSP, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xBP, pRow, DWREG_AMD64_RBP, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xSI, pRow, DWREG_AMD64_RSI, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xDI, pRow, DWREG_AMD64_RDI, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_x8,  pRow, DWREG_AMD64_R8,  pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_x9,  pRow, DWREG_AMD64_R9,  pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_x10, pRow, DWREG_AMD64_R10, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_x11, pRow, DWREG_AMD64_R11, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_x12, pRow, DWREG_AMD64_R12, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_x13, pRow, DWREG_AMD64_R13, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_x14, pRow, DWREG_AMD64_R14, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_x15, pRow, DWREG_AMD64_R15, pCie, uCfa, pfnGetReg, sizeof(uint64_t));
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_ES,  pRow, DWREG_AMD64_ES,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_CS,  pRow, DWREG_AMD64_CS,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_SS,  pRow, DWREG_AMD64_SS,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_DS,  pRow, DWREG_AMD64_DS,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_FS,  pRow, DWREG_AMD64_FS,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_GS,  pRow, DWREG_AMD64_GS,  pCie, uCfa, pfnGetReg);
+            break;
+
+        case RTLDRARCH_X86_32:
+        case RTLDRARCH_X86_16:
+            pState->enmRetType = RTDBGRETURNTYPE_NEAR32;
+            pState->u.x86.FrameAddr.off       = uCfa - 4*2;
+            pState->u.x86.Loaded.fAll         = 0;
+            pState->u.x86.Loaded.s.fFrameAddr = 1;
+            rtDwarfUnwind_UpdatePCFromRow(pState, &Old,                    pRow, DWREG_X86_RA,  pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86RFlagsFromRow(pState, &Old,             pRow, DWREG_X86_EFLAGS, pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xAX, pRow, DWREG_X86_EAX, pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xCX, pRow, DWREG_X86_ECX, pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xDX, pRow, DWREG_X86_EDX, pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xBX, pRow, DWREG_X86_EBX, pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xSP, pRow, DWREG_X86_ESP, pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xBP, pRow, DWREG_X86_EBP, pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xSI, pRow, DWREG_X86_ESI, pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86GRegFromRow(pState, &Old, X86_GREG_xDI, pRow, DWREG_X86_EDI, pCie, uCfa, pfnGetReg, sizeof(uint32_t));
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_ES,  pRow, DWREG_X86_ES,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_CS,  pRow, DWREG_X86_CS,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_SS,  pRow, DWREG_X86_SS,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_DS,  pRow, DWREG_X86_DS,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_FS,  pRow, DWREG_X86_FS,  pCie, uCfa, pfnGetReg);
+            rtDwarfUnwind_UpdateX86SRegFromRow(pState, &Old, X86_SREG_GS,  pRow, DWREG_X86_GS,  pCie, uCfa, pfnGetReg);
+            if (pState->u.x86.Loaded.s.fRegs & RT_BIT_32(X86_GREG_xSP))
+                pState->u.x86.FrameAddr.off = pState->u.x86.auRegs[X86_GREG_xSP] - 8;
+            else
+                pState->u.x86.FrameAddr.off = uCfa - 8;
+            pState->u.x86.FrameAddr.sel = pState->u.x86.auSegs[X86_SREG_SS];
+            if (pState->u.x86.Loaded.s.fSegs & RT_BIT_32(X86_SREG_CS))
+            {
+                if ((pState->uPc >> 16) == pState->u.x86.auSegs[X86_SREG_CS])
+                {
+                    pState->enmRetType = RTDBGRETURNTYPE_FAR16;
+                    pState->uPc &= UINT16_MAX;
+                    Log8(("rtDwarfUnwind_UpdateStateFromRow: Detected FAR16 return to %04x:%04RX64\n", pState->u.x86.auSegs[X86_SREG_CS], pState->uPc));
+                }
+                else
+                {
+                    pState->enmRetType = RTDBGRETURNTYPE_FAR32;
+                    Log8(("rtDwarfUnwind_UpdateStateFromRow: CS loaded, assume far return.\n"));
+                }
+            }
+            break;
+
+        default:
+            AssertFailedReturn(VERR_NOT_SUPPORTED);
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Processes a FDE, taking over after the PC range field.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor         The cursor.
+ * @param   pCie            Information about the corresponding CIE.
+ * @param   uPcBegin        The PC begin field value (sans segment).
+ * @param   cbPcRange       The PC range from @a uPcBegin.
+ * @param   offInRange      The offset into the range corresponding to
+ *                          pState->uPc.
+ * @param   enmImageArch    The image architecture.
+ * @param   pState          The unwind state to work.
+ */
+static int rtDwarfUnwind_ProcessFde(PRTDWARFCURSOR pCursor, PCRTDWARFCIEINFO pCie, uint64_t uPcBegin,
+                                    uint64_t cbPcRange, uint64_t offInRange, RTLDRARCH enmImageArch, PRTDBGUNWINDSTATE pState)
+{
+    /*
+     * Deal with augmented data fields.
+     */
+    /* The size. */
+    size_t cbInstr = ~(size_t)0;
+    if (pCie->fHasAugmentationSize)
+    {
+        uint64_t cbAugData = rtDwarfCursor_GetULeb128(pCursor, UINT64_MAX);
+        if (RT_FAILURE(pCursor->rc))
+            return pCursor->rc;
+        if (cbAugData > pCursor->cbUnitLeft)
+            return VERR_DBG_MALFORMED_UNWIND_INFO;
+        cbInstr = pCursor->cbUnitLeft - cbAugData;
+    }
+    else if (pCie->fHasUnknowAugmentation)
+        return VERR_DBG_MALFORMED_UNWIND_INFO;
+
+    /* Parse the string and fetch FDE fields. */
+    if (!pCie->fHasEhData)
+        for (const char *pszAug = pCie->pszAugmentation; *pszAug != '\0'; pszAug++)
+            switch (*pszAug)
+            {
+                case 'L':
+                    if (pCie->bLsdaPtrEnc != DW_EH_PE_omit)
+                        rtDwarfCursor_GetPtrEnc(pCursor, pCie->bLsdaPtrEnc, 0);
+                    break;
+            }
+
+    /* Skip unconsumed bytes. */
+    if (   cbInstr != ~(size_t)0
+        && pCursor->cbUnitLeft > cbInstr)
+        rtDwarfCursor_SkipBytes(pCursor, pCursor->cbUnitLeft - cbInstr);
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+
+    /*
+     * Now "execute" the programs till we've constructed the desired row.
+     */
+    RTDWARFCFROW            Row;
+    RTDWARFCFEXEC           ExecState = { &Row, offInRange, 0, true /** @todo byte-order*/, pCie, uPcBegin, offInRange };
+    RT_ZERO(Row);
+
+    int rc = rtDwarfUnwind_Execute(&ExecState, pCie->pbInstructions, (uint32_t)pCie->cbInstructions);
+    if (rc == VINF_TRY_AGAIN)
+        rc = rtDwarfUnwind_Execute(&ExecState, pCursor->pb, (uint32_t)pCursor->cbUnitLeft);
+
+    /* On success, extract whatever state we've got. */
+    if (RT_SUCCESS(rc))
+        rc = rtDwarfUnwind_UpdateStateFromRow(pState, &Row, pCie, enmImageArch);
+
+    /*
+     * Clean up allocations in case of pushes.
+     */
+    if (ExecState.pRow == &Row)
+        Assert(!ExecState.pRow->fOnHeap);
+    else
+        do
+        {
+            PRTDWARFCFROW pPopped = ExecState.pRow;
+            ExecState.pRow = ExecState.pRow->pNextOnStack;
+            Assert(pPopped->fOnHeap);
+            RTMemTmpFree(pPopped);
+        } while (ExecState.pRow && ExecState.pRow != &Row);
+
+    RT_NOREF(pState, uPcBegin, cbPcRange, offInRange);
+    return rc;
+}
+
+
+/**
+ * Load the information we need from a CIE.
+ *
+ * This starts after the initial length and CIE_pointer fields has
+ * been processed.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor         The cursor.
+ * @param   pNewCie         The structure to populate with parsed CIE info.
+ * @param   offUnit         The unit offset.
+ * @param   bDefaultPtrEnc  The default pointer encoding.
+ */
+static int rtDwarfUnwind_LoadCie(PRTDWARFCURSOR pCursor, PRTDWARFCIEINFO pNewCie, uint64_t offUnit, uint8_t bDefaultPtrEnc)
+{
+    /*
+     * Initialize the CIE record and get the version.
+     */
+    RT_ZERO(*pNewCie);
+    pNewCie->offCie         = offUnit;
+    pNewCie->bLsdaPtrEnc    = DW_EH_PE_omit;
+    pNewCie->bAddressPtrEnc = DW_EH_PE_omit; /* set later */
+    pNewCie->uDwarfVer      = rtDwarfCursor_GetUByte(pCursor, 0);
+    if (   pNewCie->uDwarfVer >= 1 /* Note! Some GCC versions may emit v1 here. */
+        && pNewCie->uDwarfVer <= 5)
+    { /* likely */ }
+    else
+    {
+        Log(("rtDwarfUnwind_LoadCie(%RX64): uDwarfVer=%u: VERR_VERSION_MISMATCH\n", offUnit, pNewCie->uDwarfVer));
+        return VERR_VERSION_MISMATCH;
+    }
+
+    /*
+     * The augmentation string.
+     *
+     * First deal with special "eh" string from oldish GCC (dwarf2out.c about 1997), specified in LSB:
+     *     https://refspecs.linuxfoundation.org/LSB_3.0.0/LSB-PDA/LSB-PDA/ehframechpt.html
+     */
+    pNewCie->pszAugmentation = rtDwarfCursor_GetSZ(pCursor, "");
+    if (   pNewCie->pszAugmentation[0] == 'e'
+        && pNewCie->pszAugmentation[1] == 'h'
+        && pNewCie->pszAugmentation[2] == '\0')
+    {
+        pNewCie->fHasEhData = true;
+        rtDwarfCursor_GetPtrEnc(pCursor, bDefaultPtrEnc, 0);
+    }
+    else
+    {
+        /* Regular augmentation string. */
+        for (const char *pszAug = pNewCie->pszAugmentation; *pszAug != '\0'; pszAug++)
+            switch (*pszAug)
+            {
+                case 'z':
+                    pNewCie->fHasAugmentationSize = true;
+                    break;
+                case 'L':
+                    pNewCie->fHasLanguageSpecificDataArea = true;
+                    break;
+                case 'P':
+                    pNewCie->fHasPersonalityRoutine = true;
+                    break;
+                case 'R':
+                    pNewCie->fHasAddressEnc = true;
+                    break;
+                case 'S':
+                    pNewCie->fIsSignalFrame = true;
+                    break;
+                default:
+                    pNewCie->fHasUnknowAugmentation = true;
+                    break;
+            }
+    }
+
+    /*
+     * More standard fields
+     */
+    uint8_t cbAddress = 0;
+    if (pNewCie->uDwarfVer >= 4)
+    {
+        cbAddress = rtDwarfCursor_GetU8(pCursor, bDefaultPtrEnc == DW_EH_PE_udata8 ? 8 : 4);
+        pNewCie->cbSegment = rtDwarfCursor_GetU8(pCursor, 0);
+    }
+    pNewCie->uCodeAlignFactor = rtDwarfCursor_GetULeb128(pCursor, 1);
+    pNewCie->iDataAlignFactor = rtDwarfCursor_GetSLeb128(pCursor, 1);
+    pNewCie->bRetReg          = rtDwarfCursor_GetU8(pCursor, UINT8_MAX);
+
+    /*
+     * Augmentation data.
+     */
+    if (!pNewCie->fHasEhData)
+    {
+        /* The size. */
+        size_t cbInstr = ~(size_t)0;
+        if (pNewCie->fHasAugmentationSize)
+        {
+            uint64_t cbAugData = rtDwarfCursor_GetULeb128(pCursor, UINT64_MAX);
+            if (RT_FAILURE(pCursor->rc))
+            {
+                Log(("rtDwarfUnwind_LoadCie(%#RX64): rtDwarfCursor_GetULeb128 -> %Rrc!\n", offUnit, pCursor->rc));
+                return pCursor->rc;
+            }
+            if (cbAugData > pCursor->cbUnitLeft)
+            {
+                Log(("rtDwarfUnwind_LoadCie(%#RX64): cbAugData=%#x pCursor->cbUnitLeft=%#x -> VERR_DBG_MALFORMED_UNWIND_INFO!\n", offUnit, cbAugData, pCursor->cbUnitLeft));
+                return VERR_DBG_MALFORMED_UNWIND_INFO;
+            }
+            cbInstr = pCursor->cbUnitLeft - cbAugData;
+        }
+        else if (pNewCie->fHasUnknowAugmentation)
+        {
+            Log(("rtDwarfUnwind_LoadCie(%#RX64): fHasUnknowAugmentation=1 -> VERR_DBG_MALFORMED_UNWIND_INFO!\n", offUnit));
+            return VERR_DBG_MALFORMED_UNWIND_INFO;
+        }
+
+        /* Parse the string. */
+        for (const char *pszAug = pNewCie->pszAugmentation; *pszAug != '\0'; pszAug++)
+            switch (*pszAug)
+            {
+                case 'L':
+                    pNewCie->bLsdaPtrEnc = rtDwarfCursor_GetU8(pCursor, DW_EH_PE_omit);
+                    break;
+                case 'P':
+                    rtDwarfCursor_GetPtrEnc(pCursor, rtDwarfCursor_GetU8(pCursor, DW_EH_PE_omit), 0);
+                    break;
+                case 'R':
+                    pNewCie->bAddressPtrEnc = rtDwarfCursor_GetU8(pCursor, DW_EH_PE_omit);
+                    break;
+            }
+
+        /* Skip unconsumed bytes. */
+        if (   cbInstr != ~(size_t)0
+            && pCursor->cbUnitLeft > cbInstr)
+            rtDwarfCursor_SkipBytes(pCursor, pCursor->cbUnitLeft - cbInstr);
+    }
+
+    /*
+     * Note down where the instructions are.
+     */
+    pNewCie->pbInstructions = pCursor->pb;
+    pNewCie->cbInstructions = pCursor->cbUnitLeft;
+
+    /*
+     * Determine the target address encoding.  Make sure we resolve DW_EH_PE_ptr.
+     */
+    if (pNewCie->bAddressPtrEnc == DW_EH_PE_omit)
+        switch (cbAddress)
+        {
+            case 2:     pNewCie->bAddressPtrEnc = DW_EH_PE_udata2; break;
+            case 4:     pNewCie->bAddressPtrEnc = DW_EH_PE_udata4; break;
+            case 8:     pNewCie->bAddressPtrEnc = DW_EH_PE_udata8; break;
+            default:    pNewCie->bAddressPtrEnc = bDefaultPtrEnc;  break;
+        }
+    else if ((pNewCie->bAddressPtrEnc & DW_EH_PE_FORMAT_MASK) == DW_EH_PE_ptr)
+        pNewCie->bAddressPtrEnc = bDefaultPtrEnc;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Does a slow unwind of a '.debug_frame' or '.eh_frame' section.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor         The cursor.
+ * @param   uRvaCursor      The RVA corrsponding to the cursor start location.
+ * @param   idxSeg          The segment of the PC location.
+ * @param   offSeg          The segment offset of the PC location.
+ * @param   uRva            The RVA of the PC location.
+ * @param   pState          The unwind state to work.
+ * @param   bDefaultPtrEnc  The default pointer encoding.
+ * @param   fIsEhFrame      Set if this is a '.eh_frame'.  GCC generate these
+ *                          with different CIE_pointer values.
+ * @param   enmImageArch    The image architecture.
+ */
+DECLHIDDEN(int) rtDwarfUnwind_Slow(PRTDWARFCURSOR pCursor, RTUINTPTR uRvaCursor,
+                                   RTDBGSEGIDX idxSeg, RTUINTPTR offSeg, RTUINTPTR uRva,
+                                   PRTDBGUNWINDSTATE pState, uint8_t bDefaultPtrEnc, bool fIsEhFrame, RTLDRARCH enmImageArch)
+{
+    Log8(("rtDwarfUnwind_Slow: idxSeg=%#x offSeg=%RTptr uRva=%RTptr enmArch=%d PC=%#RX64\n", idxSeg, offSeg, uRva, pState->enmArch, pState->uPc));
+
+    /*
+     * CIE info we collect.
+     */
+    PRTDWARFCIEINFO paCies   = NULL;
+    uint32_t        cCies    = 0;
+    PRTDWARFCIEINFO pCieHint = NULL;
+
+    /*
+     * Do the scanning.
+     */
+    uint64_t const offCieOffset = pCursor->f64bitDwarf ? UINT64_MAX : UINT32_MAX;
+    int rc = VERR_DBG_UNWIND_INFO_NOT_FOUND;
+    while (!rtDwarfCursor_IsAtEnd(pCursor))
+    {
+        uint64_t const offUnit = rtDwarfCursor_CalcSectOffsetU32(pCursor);
+        if (rtDwarfCursor_GetInitialLength(pCursor) == 0)
+            break;
+
+        uint64_t const offRelCie = rtDwarfCursor_GetUOff(pCursor, offCieOffset);
+        if (offRelCie != offCieOffset)
+        {
+            /*
+             * Frame descriptor entry (FDE).
+             */
+            /* Locate the corresponding CIE.  The CIE pointer is self relative
+               in .eh_frame and section relative in .debug_frame. */
+            PRTDWARFCIEINFO pCieForFde;
+            uint64_t offCie = fIsEhFrame ? offUnit + 4 - offRelCie : offRelCie;
+            if (pCieHint && pCieHint->offCie == offCie)
+                pCieForFde = pCieHint;
+            else
+            {
+                pCieForFde = NULL;
+                uint32_t i = cCies;
+                while (i-- > 0)
+                    if (paCies[i].offCie == offCie)
+                    {
+                        pCieHint = pCieForFde = &paCies[i];
+                        break;
+                    }
+            }
+            if (pCieForFde)
+            {
+                /* Read the PC range covered by this FDE (the fields are also known as initial_location). */
+                RTDBGSEGIDX idxFdeSeg = RTDBGSEGIDX_RVA;
+                if (pCieForFde->cbSegment)
+                    idxFdeSeg = rtDwarfCursor_GetVarSizedU(pCursor, pCieForFde->cbSegment, RTDBGSEGIDX_RVA);
+                uint64_t uPcBegin;
+                switch (pCieForFde->bAddressPtrEnc & DW_EH_PE_APPL_MASK)
+                {
+                    default: AssertFailed();
+                        RT_FALL_THRU();
+                    case DW_EH_PE_absptr:
+                        uPcBegin = rtDwarfCursor_GetPtrEnc(pCursor, pCieForFde->bAddressPtrEnc, 0);
+                        break;
+                    case DW_EH_PE_pcrel:
+                    {
+                        uPcBegin = rtDwarfCursor_CalcSectOffsetU32(pCursor) + uRvaCursor;
+                        uPcBegin += rtDwarfCursor_GetPtrEnc(pCursor, pCieForFde->bAddressPtrEnc, 0);
+                        break;
+                    }
+                }
+                uint64_t cbPcRange = rtDwarfCursor_GetPtrEnc(pCursor, pCieForFde->bAddressPtrEnc, 0);
+
+                /* Match it with what we're looking for. */
+                bool fMatch = idxFdeSeg == RTDBGSEGIDX_RVA
+                            ? uRva - uPcBegin < cbPcRange
+                            : idxSeg == idxFdeSeg && offSeg - uPcBegin < cbPcRange;
+                Log8(("%#08RX64: FDE pCie=%p idxFdeSeg=%#x uPcBegin=%#RX64 cbPcRange=%#x fMatch=%d\n",
+                      offUnit, pCieForFde, idxFdeSeg, uPcBegin, cbPcRange, fMatch));
+                if (fMatch)
+                {
+                    rc = rtDwarfUnwind_ProcessFde(pCursor, pCieForFde, uPcBegin, cbPcRange,
+                                                  idxFdeSeg == RTDBGSEGIDX_RVA ? uRva - uPcBegin : offSeg - uPcBegin,
+                                                  enmImageArch, pState);
+                    break;
+                }
+            }
+            else
+                Log8(("%#08RX64: FDE -  pCie=NULL!!  offCie=%#RX64 offRelCie=%#RX64 fIsEhFrame=%d\n", offUnit, offCie, offRelCie, fIsEhFrame));
+        }
+        else
+        {
+            /*
+             * Common information entry (CIE).  Record the info we need about it.
+             */
+            if ((cCies & 8) == 0)
+            {
+                void *pvNew = RTMemRealloc(paCies, sizeof(paCies[0]) * (cCies + 8));
+                if (pvNew)
+                    paCies = (PRTDWARFCIEINFO)pvNew;
+                else
+                {
+                    rc = VERR_NO_MEMORY;
+                    break;
+                }
+            }
+            Log8(("%#08RX64: CIE\n", offUnit));
+            int rc2 = rtDwarfUnwind_LoadCie(pCursor, &paCies[cCies], offUnit, bDefaultPtrEnc);
+            if (RT_SUCCESS(rc2))
+            {
+                Log8(("%#08RX64: CIE #%u: offCie=%#RX64\n", offUnit, cCies, paCies[cCies].offCie));
+                cCies++;
+            }
+        }
+        rtDwarfCursor_SkipUnit(pCursor);
+    }
+
+    /*
+     * Cleanup.
+     */
+    if (paCies)
+        RTMemFree(paCies);
+    Log8(("rtDwarfUnwind_Slow: returns %Rrc PC=%#RX64\n", rc, pState->uPc));
+    return rc;
+}
+
+
+/**
+ * Helper for translating a loader architecture value to a pointe encoding.
+ *
+ * @returns Pointer encoding.
+ * @param   enmLdrArch          The loader architecture value to convert.
+ */
+static uint8_t rtDwarfUnwind_ArchToPtrEnc(RTLDRARCH enmLdrArch)
+{
+    switch (enmLdrArch)
+    {
+        case RTLDRARCH_AMD64:
+        case RTLDRARCH_ARM64:
+            return DW_EH_PE_udata8;
+        case RTLDRARCH_X86_16:
+        case RTLDRARCH_X86_32:
+        case RTLDRARCH_ARM32:
+            return DW_EH_PE_udata4;
+        case RTLDRARCH_HOST:
+        case RTLDRARCH_WHATEVER:
+        case RTLDRARCH_INVALID:
+        case RTLDRARCH_END:
+        case RTLDRARCH_32BIT_HACK:
+            break;
+    }
+    AssertFailed();
+    return DW_EH_PE_udata4;
+}
+
+
+/**
+ * Interface for the loader code.
+ *
+ * @returns IPRT status.
+ * @param   pvSection       The '.eh_frame' section data.
+ * @param   cbSection       The size of the '.eh_frame' section data.
+ * @param   uRvaSection     The RVA of the '.eh_frame' section.
+ * @param   idxSeg          The segment of the PC location.
+ * @param   offSeg          The segment offset of the PC location.
+ * @param   uRva            The RVA of the PC location.
+ * @param   pState          The unwind state to work.
+ * @param   enmArch         The image architecture.
+ */
+DECLHIDDEN(int) rtDwarfUnwind_EhData(void const *pvSection, size_t cbSection, RTUINTPTR uRvaSection,
+                                     RTDBGSEGIDX idxSeg, RTUINTPTR offSeg, RTUINTPTR uRva,
+                                     PRTDBGUNWINDSTATE pState, RTLDRARCH enmArch)
+{
+    RTDWARFCURSOR Cursor;
+    rtDwarfCursor_InitForMem(&Cursor, pvSection, cbSection);
+    int rc = rtDwarfUnwind_Slow(&Cursor, uRvaSection, idxSeg, offSeg, uRva, pState,
+                                rtDwarfUnwind_ArchToPtrEnc(enmArch), true /*fIsEhFrame*/, enmArch);
+    LogFlow(("rtDwarfUnwind_EhData: rtDwarfUnwind_Slow -> %Rrc\n", rc));
+    rc = rtDwarfCursor_Delete(&Cursor, rc);
+    LogFlow(("rtDwarfUnwind_EhData: returns %Rrc\n", rc));
+    return rc;
+}
+
+
+/*
+ *
+ * DWARF Line Numbers.
+ * DWARF Line Numbers.
+ * DWARF Line Numbers.
+ *
+ */
+
+
+/**
+ * Defines a file name.
+ *
+ * @returns IPRT status code.
+ * @param   pLnState            The line number program state.
+ * @param   pszFilename         The name of the file.
+ * @param   idxInc              The include path index.
+ */
+static int rtDwarfLine_DefineFileName(PRTDWARFLINESTATE pLnState, const char *pszFilename, uint64_t idxInc)
+{
+    /*
+     * Resize the array if necessary.
+     */
+    uint32_t iFileName = pLnState->cFileNames;
+    if ((iFileName % 2) == 0)
+    {
+        void *pv = RTMemRealloc(pLnState->papszFileNames, sizeof(pLnState->papszFileNames[0]) * (iFileName + 2));
+        if (!pv)
+            return VERR_NO_MEMORY;
+        pLnState->papszFileNames = (char **)pv;
+    }
+
+    /*
+     * Add the file name.
+     */
+    if (   pszFilename[0] == '/'
+        || pszFilename[0] == '\\'
+        || (RT_C_IS_ALPHA(pszFilename[0]) && pszFilename[1] == ':') )
+        pLnState->papszFileNames[iFileName] = RTStrDup(pszFilename);
+    else if (idxInc < pLnState->cIncPaths)
+        pLnState->papszFileNames[iFileName] = RTPathJoinA(pLnState->papszIncPaths[idxInc], pszFilename);
+    else
+        return VERR_DWARF_BAD_LINE_NUMBER_HEADER;
+    if (!pLnState->papszFileNames[iFileName])
+        return VERR_NO_STR_MEMORY;
+    pLnState->cFileNames = iFileName + 1;
+
+    /*
+     * Sanitize the name.
+     */
+    int rc = rtDbgModDwarfStringToUtf8(pLnState->pDwarfMod, &pLnState->papszFileNames[iFileName]);
+    Log(("  File #%02u = '%s'\n", iFileName, pLnState->papszFileNames[iFileName]));
+    return rc;
+}
+
+
+/**
+ * Adds a line to the table and resets parts of the state (DW_LNS_copy).
+ *
+ * @returns IPRT status code
+ * @param   pLnState            The line number program state.
+ * @param   offOpCode           The opcode offset (for logging
+ *                              purposes).
+ */
+static int rtDwarfLine_AddLine(PRTDWARFLINESTATE pLnState, uint32_t offOpCode)
+{
+    PRTDBGMODDWARF  pThis = pLnState->pDwarfMod;
+    int             rc;
+    if (pThis->iWatcomPass == 1)
+        rc = rtDbgModDwarfRecordSegOffset(pThis, pLnState->Regs.uSegment, pLnState->Regs.uAddress + 1);
+    else
+    {
+        const char *pszFile = pLnState->Regs.iFile < pLnState->cFileNames
+                            ? pLnState->papszFileNames[pLnState->Regs.iFile]
+                            : "<bad file name index>";
+        NOREF(offOpCode);
+
+        RTDBGSEGIDX iSeg;
+        RTUINTPTR   offSeg;
+        rc = rtDbgModDwarfLinkAddressToSegOffset(pLnState->pDwarfMod, pLnState->Regs.uSegment, pLnState->Regs.uAddress,
+                                                 &iSeg, &offSeg); /*AssertRC(rc);*/
+        if (RT_SUCCESS(rc))
+        {
+            Log2(("rtDwarfLine_AddLine: %x:%08llx (%#llx) %s(%d) [offOpCode=%08x]\n", iSeg, offSeg, pLnState->Regs.uAddress, pszFile, pLnState->Regs.uLine, offOpCode));
+            rc = RTDbgModLineAdd(pLnState->pDwarfMod->hCnt, pszFile, pLnState->Regs.uLine, iSeg, offSeg, NULL);
+
+            /* Ignore address conflicts for now. */
+            if (rc == VERR_DBG_ADDRESS_CONFLICT)
+                rc = VINF_SUCCESS;
+        }
+        else
+            rc = VINF_SUCCESS; /* ignore failure */
+    }
+
+    pLnState->Regs.fBasicBlock    = false;
+    pLnState->Regs.fPrologueEnd   = false;
+    pLnState->Regs.fEpilogueBegin = false;
+    pLnState->Regs.uDiscriminator = 0;
+    return rc;
+}
+
+
+/**
+ * Reset the program to the start-of-sequence state.
+ *
+ * @param   pLnState            The line number program state.
+ */
+static void rtDwarfLine_ResetState(PRTDWARFLINESTATE pLnState)
+{
+    pLnState->Regs.uAddress         = 0;
+    pLnState->Regs.idxOp            = 0;
+    pLnState->Regs.iFile            = 1;
+    pLnState->Regs.uLine            = 1;
+    pLnState->Regs.uColumn          = 0;
+    pLnState->Regs.fIsStatement     = RT_BOOL(pLnState->Hdr.u8DefIsStmt);
+    pLnState->Regs.fBasicBlock      = false;
+    pLnState->Regs.fEndSequence     = false;
+    pLnState->Regs.fPrologueEnd     = false;
+    pLnState->Regs.fEpilogueBegin   = false;
+    pLnState->Regs.uIsa             = 0;
+    pLnState->Regs.uDiscriminator   = 0;
+    pLnState->Regs.uSegment         = 0;
+}
+
+
+/**
+ * Runs the line number program.
+ *
+ * @returns IPRT status code.
+ * @param   pLnState            The line number program state.
+ * @param   pCursor             The cursor.
+ */
+static int rtDwarfLine_RunProgram(PRTDWARFLINESTATE pLnState, PRTDWARFCURSOR pCursor)
+{
+    LogFlow(("rtDwarfLine_RunProgram: cbUnitLeft=%zu\n", pCursor->cbUnitLeft));
+
+    int rc = VINF_SUCCESS;
+    rtDwarfLine_ResetState(pLnState);
+
+    while (!rtDwarfCursor_IsAtEndOfUnit(pCursor))
+    {
+#ifdef LOG_ENABLED
+        uint32_t const offOpCode = rtDwarfCursor_CalcSectOffsetU32(pCursor);
+#else
+        uint32_t const offOpCode = 0;
+#endif
+        uint8_t        bOpCode   = rtDwarfCursor_GetUByte(pCursor, DW_LNS_extended);
+        if (bOpCode >= pLnState->Hdr.u8OpcodeBase)
+        {
+            /*
+             * Special opcode.
+             */
+            uint8_t const bLogOpCode = bOpCode; NOREF(bLogOpCode);
+            bOpCode -= pLnState->Hdr.u8OpcodeBase;
+
+            int32_t const cLineDelta = bOpCode % pLnState->Hdr.u8LineRange + (int32_t)pLnState->Hdr.s8LineBase;
+            bOpCode /= pLnState->Hdr.u8LineRange;
+
+            uint64_t uTmp = bOpCode + pLnState->Regs.idxOp;
+            uint64_t const cAddressDelta = uTmp / pLnState->Hdr.cMaxOpsPerInstr * pLnState->Hdr.cbMinInstr;
+            uint64_t const cOpIndexDelta = uTmp % pLnState->Hdr.cMaxOpsPerInstr;
+
+            pLnState->Regs.uLine    += cLineDelta;
+            pLnState->Regs.uAddress += cAddressDelta;
+            pLnState->Regs.idxOp    += cOpIndexDelta;
+            Log2(("%08x: DW Special Opcode %#04x: uLine + %d => %u; uAddress + %#llx => %#llx; idxOp + %#llx => %#llx\n",
+                  offOpCode, bLogOpCode, cLineDelta, pLnState->Regs.uLine, cAddressDelta, pLnState->Regs.uAddress,
+                  cOpIndexDelta, pLnState->Regs.idxOp));
+
+            /*
+             * LLVM emits debug info for global constructors (_GLOBAL__I_a) which are not part of source
+             * code but are inserted by the compiler: The resulting line number will be 0
+             * because they are not part of the source file obviously (see https://reviews.llvm.org/rL205999),
+             * so skip adding them when they are encountered.
+             */
+            if (pLnState->Regs.uLine)
+                rc = rtDwarfLine_AddLine(pLnState, offOpCode);
+        }
+        else
+        {
+            switch (bOpCode)
+            {
+                /*
+                 * Standard opcode.
+                 */
+                case DW_LNS_copy:
+                    Log2(("%08x: DW_LNS_copy\n", offOpCode));
+                    /* See the comment about LLVM above. */
+                    if (pLnState->Regs.uLine)
+                        rc = rtDwarfLine_AddLine(pLnState, offOpCode);
+                    break;
+
+                case DW_LNS_advance_pc:
+                {
+                    uint64_t u64Adv = rtDwarfCursor_GetULeb128(pCursor, 0);
+                    pLnState->Regs.uAddress += (pLnState->Regs.idxOp + u64Adv) / pLnState->Hdr.cMaxOpsPerInstr
+                                             * pLnState->Hdr.cbMinInstr;
+                    pLnState->Regs.idxOp    += (pLnState->Regs.idxOp + u64Adv) % pLnState->Hdr.cMaxOpsPerInstr;
+                    Log2(("%08x: DW_LNS_advance_pc: u64Adv=%#llx (%lld) )\n", offOpCode, u64Adv, u64Adv));
+                    break;
+                }
+
+                case DW_LNS_advance_line:
+                {
+                    int32_t cLineDelta = rtDwarfCursor_GetSLeb128AsS32(pCursor, 0);
+                    pLnState->Regs.uLine += cLineDelta;
+                    Log2(("%08x: DW_LNS_advance_line: uLine + %d => %u\n", offOpCode, cLineDelta, pLnState->Regs.uLine));
+                    break;
+                }
+
+                case DW_LNS_set_file:
+                    pLnState->Regs.iFile = rtDwarfCursor_GetULeb128AsU32(pCursor, 0);
+                    Log2(("%08x: DW_LNS_set_file: iFile=%u\n", offOpCode, pLnState->Regs.iFile));
+                    break;
+
+                case DW_LNS_set_column:
+                    pLnState->Regs.uColumn = rtDwarfCursor_GetULeb128AsU32(pCursor, 0);
+                    Log2(("%08x: DW_LNS_set_column\n", offOpCode));
+                    break;
+
+                case DW_LNS_negate_stmt:
+                    pLnState->Regs.fIsStatement = !pLnState->Regs.fIsStatement;
+                    Log2(("%08x: DW_LNS_negate_stmt\n", offOpCode));
+                    break;
+
+                case DW_LNS_set_basic_block:
+                    pLnState->Regs.fBasicBlock = true;
+                    Log2(("%08x: DW_LNS_set_basic_block\n", offOpCode));
+                    break;
+
+                case DW_LNS_const_add_pc:
+                {
+                    uint8_t u8Adv = (255 - pLnState->Hdr.u8OpcodeBase) / pLnState->Hdr.u8LineRange;
+                    if (pLnState->Hdr.cMaxOpsPerInstr <= 1)
+                        pLnState->Regs.uAddress += (uint32_t)pLnState->Hdr.cbMinInstr * u8Adv;
+                    else
+                    {
+                        pLnState->Regs.uAddress += (pLnState->Regs.idxOp + u8Adv) / pLnState->Hdr.cMaxOpsPerInstr
+                                                 * pLnState->Hdr.cbMinInstr;
+                        pLnState->Regs.idxOp     = (pLnState->Regs.idxOp + u8Adv) % pLnState->Hdr.cMaxOpsPerInstr;
+                    }
+                    Log2(("%08x: DW_LNS_const_add_pc\n", offOpCode));
+                    break;
+                }
+                case DW_LNS_fixed_advance_pc:
+                    pLnState->Regs.uAddress += rtDwarfCursor_GetUHalf(pCursor, 0);
+                    pLnState->Regs.idxOp     = 0;
+                    Log2(("%08x: DW_LNS_fixed_advance_pc\n", offOpCode));
+                    break;
+
+                case DW_LNS_set_prologue_end:
+                    pLnState->Regs.fPrologueEnd = true;
+                    Log2(("%08x: DW_LNS_set_prologue_end\n", offOpCode));
+                    break;
+
+                case DW_LNS_set_epilogue_begin:
+                    pLnState->Regs.fEpilogueBegin = true;
+                    Log2(("%08x: DW_LNS_set_epilogue_begin\n", offOpCode));
+                    break;
+
+                case DW_LNS_set_isa:
+                    pLnState->Regs.uIsa = rtDwarfCursor_GetULeb128AsU32(pCursor, 0);
+                    Log2(("%08x: DW_LNS_set_isa %#x\n", offOpCode, pLnState->Regs.uIsa));
+                    break;
+
+                default:
+                {
+                    unsigned cOpsToSkip = pLnState->Hdr.pacStdOperands[bOpCode - 1];
+                    Log(("rtDwarfLine_RunProgram: Unknown standard opcode %#x, %#x operands, at %08x.\n", bOpCode, cOpsToSkip, offOpCode));
+                    while (cOpsToSkip-- > 0)
+                        rc = rtDwarfCursor_SkipLeb128(pCursor);
+                    break;
+                }
+
+                /*
+                 * Extended opcode.
+                 */
+                case DW_LNS_extended:
+                {
+                    /* The instruction has a length prefix. */
+                    uint64_t cbInstr = rtDwarfCursor_GetULeb128(pCursor, UINT64_MAX);
+                    if (RT_FAILURE(pCursor->rc))
+                        return pCursor->rc;
+                    if (cbInstr > pCursor->cbUnitLeft)
+                        return VERR_DWARF_BAD_LNE;
+                    uint8_t const * const pbEndOfInstr = rtDwarfCursor_CalcPos(pCursor, cbInstr);
+
+                    /* Get the opcode and deal with it if we know it. */
+                    bOpCode = rtDwarfCursor_GetUByte(pCursor, 0);
+                    switch (bOpCode)
+                    {
+                        case DW_LNE_end_sequence:
+#if 0 /* No need for this, I think. */
+                            pLnState->Regs.fEndSequence = true;
+                            rc = rtDwarfLine_AddLine(pLnState, offOpCode);
+#endif
+                            rtDwarfLine_ResetState(pLnState);
+                            Log2(("%08x: DW_LNE_end_sequence\n", offOpCode));
+                            break;
+
+                        case DW_LNE_set_address:
+                            pLnState->Regs.uAddress = rtDwarfCursor_GetVarSizedU(pCursor, cbInstr - 1, UINT64_MAX);
+                            pLnState->Regs.idxOp    = 0;
+                            Log2(("%08x: DW_LNE_set_address: %#llx\n", offOpCode, pLnState->Regs.uAddress));
+                            break;
+
+                        case DW_LNE_define_file:
+                        {
+                            const char *pszFilename = rtDwarfCursor_GetSZ(pCursor, NULL);
+                            uint32_t    idxInc      = rtDwarfCursor_GetULeb128AsU32(pCursor, UINT32_MAX);
+                            rtDwarfCursor_SkipLeb128(pCursor); /* st_mtime */
+                            rtDwarfCursor_SkipLeb128(pCursor); /* st_size */
+                            Log2(("%08x: DW_LNE_define_file: {%d}/%s\n", offOpCode, idxInc, pszFilename));
+
+                            rc = rtDwarfCursor_AdvanceToPos(pCursor, pbEndOfInstr);
+                            if (RT_SUCCESS(rc))
+                                rc = rtDwarfLine_DefineFileName(pLnState, pszFilename, idxInc);
+                            break;
+                        }
+
+                        /*
+                         * Note! Was defined in DWARF 4.  But... Watcom used it
+                         *       for setting the segment in DWARF 2, creating
+                         *       an incompatibility with the newer standard.
+                         */
+                        case DW_LNE_set_descriminator:
+                            if (pLnState->Hdr.uVer != 2)
+                            {
+                                Assert(pLnState->Hdr.uVer >= 4);
+                                pLnState->Regs.uDiscriminator = rtDwarfCursor_GetULeb128AsU32(pCursor, UINT32_MAX);
+                                Log2(("%08x: DW_LNE_set_descriminator: %u\n", offOpCode, pLnState->Regs.uDiscriminator));
+                            }
+                            else
+                            {
+                                uint64_t uSeg = rtDwarfCursor_GetVarSizedU(pCursor, cbInstr - 1, UINT64_MAX);
+                                Log2(("%08x: DW_LNE_set_segment: %#llx, cbInstr=%#x - Watcom Extension\n", offOpCode, uSeg, cbInstr));
+                                pLnState->Regs.uSegment = (RTSEL)uSeg;
+                                AssertStmt(pLnState->Regs.uSegment == uSeg, rc = VERR_DWARF_BAD_INFO);
+                            }
+                            break;
+
+                        default:
+                            Log(("rtDwarfLine_RunProgram: Unknown extended opcode %#x, length %#x at %08x\n", bOpCode, cbInstr, offOpCode));
+                            break;
+                    }
+
+                    /* Advance the cursor to the end of the instruction . */
+                    rtDwarfCursor_AdvanceToPos(pCursor, pbEndOfInstr);
+                    break;
+                }
+            }
+        }
+
+        /*
+         * Check the status before looping.
+         */
+        if (RT_FAILURE(rc))
+            return rc;
+        if (RT_FAILURE(pCursor->rc))
+            return pCursor->rc;
+    }
+    return rc;
+}
+
+
+/**
+ * Reads the include directories for a line number unit.
+ *
+ * @returns IPRT status code
+ * @param   pLnState            The line number program state.
+ * @param   pCursor             The cursor.
+ */
+static int rtDwarfLine_ReadFileNames(PRTDWARFLINESTATE pLnState, PRTDWARFCURSOR pCursor)
+{
+    int rc = rtDwarfLine_DefineFileName(pLnState, "/<bad-zero-file-name-entry>", 0);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    for (;;)
+    {
+        const char *psz = rtDwarfCursor_GetSZ(pCursor, NULL);
+        if (!*psz)
+            break;
+
+        uint64_t idxInc = rtDwarfCursor_GetULeb128(pCursor, UINT64_MAX);
+        rtDwarfCursor_SkipLeb128(pCursor); /* st_mtime */
+        rtDwarfCursor_SkipLeb128(pCursor); /* st_size */
+
+        rc = rtDwarfLine_DefineFileName(pLnState, psz, idxInc);
+        if (RT_FAILURE(rc))
+            return rc;
+    }
+    return pCursor->rc;
+}
+
+
+/**
+ * Reads the include directories for a line number unit.
+ *
+ * @returns IPRT status code
+ * @param   pLnState            The line number program state.
+ * @param   pCursor             The cursor.
+ */
+static int rtDwarfLine_ReadIncludePaths(PRTDWARFLINESTATE pLnState, PRTDWARFCURSOR pCursor)
+{
+    const char *psz = "";   /* The zeroth is the unit dir. */
+    for (;;)
+    {
+        if ((pLnState->cIncPaths % 2) == 0)
+        {
+            void *pv = RTMemRealloc(pLnState->papszIncPaths, sizeof(pLnState->papszIncPaths[0]) * (pLnState->cIncPaths + 2));
+            if (!pv)
+                return VERR_NO_MEMORY;
+            pLnState->papszIncPaths = (const char **)pv;
+        }
+        Log(("  Path #%02u = '%s'\n", pLnState->cIncPaths, psz));
+        pLnState->papszIncPaths[pLnState->cIncPaths] = psz;
+        pLnState->cIncPaths++;
+
+        psz = rtDwarfCursor_GetSZ(pCursor, NULL);
+        if (!*psz)
+            break;
+    }
+
+    return pCursor->rc;
+}
+
+
+/**
+ * Explodes the line number table for a compilation unit.
+ *
+ * @returns IPRT status code
+ * @param   pThis               The DWARF instance.
+ * @param   pCursor             The cursor to read the line number information
+ *                              via.
+ */
+static int rtDwarfLine_ExplodeUnit(PRTDBGMODDWARF pThis, PRTDWARFCURSOR pCursor)
+{
+    RTDWARFLINESTATE LnState;
+    RT_ZERO(LnState);
+    LnState.pDwarfMod = pThis;
+
+    /*
+     * Parse the header.
+     */
+    rtDwarfCursor_GetInitialLength(pCursor);
+    LnState.Hdr.uVer           = rtDwarfCursor_GetUHalf(pCursor, 0);
+    if (   LnState.Hdr.uVer < 2
+        || LnState.Hdr.uVer > 4)
+        return rtDwarfCursor_SkipUnit(pCursor);
+
+    LnState.Hdr.offFirstOpcode = rtDwarfCursor_GetUOff(pCursor, 0);
+    uint8_t const * const pbFirstOpcode = rtDwarfCursor_CalcPos(pCursor, LnState.Hdr.offFirstOpcode);
+
+    LnState.Hdr.cbMinInstr     = rtDwarfCursor_GetUByte(pCursor, 0);
+    if (LnState.Hdr.uVer >= 4)
+        LnState.Hdr.cMaxOpsPerInstr = rtDwarfCursor_GetUByte(pCursor, 0);
+    else
+        LnState.Hdr.cMaxOpsPerInstr = 1;
+    LnState.Hdr.u8DefIsStmt    = rtDwarfCursor_GetUByte(pCursor, 0);
+    LnState.Hdr.s8LineBase     = rtDwarfCursor_GetSByte(pCursor, 0);
+    LnState.Hdr.u8LineRange    = rtDwarfCursor_GetUByte(pCursor, 0);
+    LnState.Hdr.u8OpcodeBase   = rtDwarfCursor_GetUByte(pCursor, 0);
+
+    if (   !LnState.Hdr.u8OpcodeBase
+        || !LnState.Hdr.cMaxOpsPerInstr
+        || !LnState.Hdr.u8LineRange
+        || LnState.Hdr.u8DefIsStmt > 1)
+        return VERR_DWARF_BAD_LINE_NUMBER_HEADER;
+    Log2(("DWARF Line number header:\n"
+          "    uVer             %d\n"
+          "    offFirstOpcode   %#llx\n"
+          "    cbMinInstr       %u\n"
+          "    cMaxOpsPerInstr  %u\n"
+          "    u8DefIsStmt      %u\n"
+          "    s8LineBase       %d\n"
+          "    u8LineRange      %u\n"
+          "    u8OpcodeBase     %u\n",
+          LnState.Hdr.uVer,    LnState.Hdr.offFirstOpcode, LnState.Hdr.cbMinInstr,  LnState.Hdr.cMaxOpsPerInstr,
+          LnState.Hdr.u8DefIsStmt, LnState.Hdr.s8LineBase, LnState.Hdr.u8LineRange, LnState.Hdr.u8OpcodeBase));
+
+    LnState.Hdr.pacStdOperands = pCursor->pb;
+    for (uint8_t iStdOpcode = 1; iStdOpcode < LnState.Hdr.u8OpcodeBase; iStdOpcode++)
+        rtDwarfCursor_GetUByte(pCursor, 0);
+
+    int rc = pCursor->rc;
+    if (RT_SUCCESS(rc))
+        rc = rtDwarfLine_ReadIncludePaths(&LnState, pCursor);
+    if (RT_SUCCESS(rc))
+        rc = rtDwarfLine_ReadFileNames(&LnState, pCursor);
+
+    /*
+     * Run the program....
+     */
+    if (RT_SUCCESS(rc))
+        rc = rtDwarfCursor_AdvanceToPos(pCursor, pbFirstOpcode);
+    if (RT_SUCCESS(rc))
+        rc = rtDwarfLine_RunProgram(&LnState, pCursor);
+
+    /*
+     * Clean up.
+     */
+    size_t i = LnState.cFileNames;
+    while (i-- > 0)
+        RTStrFree(LnState.papszFileNames[i]);
+    RTMemFree(LnState.papszFileNames);
+    RTMemFree(LnState.papszIncPaths);
+
+    Assert(rtDwarfCursor_IsAtEndOfUnit(pCursor) || RT_FAILURE(rc));
+    return rc;
+}
+
+
+/**
+ * Explodes the line number table.
+ *
+ * The line numbers are insered into the debug info container.
+ *
+ * @returns IPRT status code
+ * @param   pThis               The DWARF instance.
+ */
+static int rtDwarfLine_ExplodeAll(PRTDBGMODDWARF pThis)
+{
+    if (!pThis->aSections[krtDbgModDwarfSect_line].fPresent)
+        return VINF_SUCCESS;
+
+    RTDWARFCURSOR Cursor;
+    int rc = rtDwarfCursor_Init(&Cursor, pThis, krtDbgModDwarfSect_line);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    while (   !rtDwarfCursor_IsAtEnd(&Cursor)
+           && RT_SUCCESS(rc))
+        rc = rtDwarfLine_ExplodeUnit(pThis, &Cursor);
+
+    return rtDwarfCursor_Delete(&Cursor, rc);
+}
+
+
+/*
+ *
+ * DWARF Abbreviations.
+ * DWARF Abbreviations.
+ * DWARF Abbreviations.
+ *
+ */
+
+/**
+ * Deals with a cache miss in rtDwarfAbbrev_Lookup.
+ *
+ * @returns Pointer to abbreviation cache entry (read only).  May be rendered
+ *          invalid by subsequent calls to this function.
+ * @param   pThis               The DWARF instance.
+ * @param   uCode               The abbreviation code to lookup.
+ */
+static PCRTDWARFABBREV rtDwarfAbbrev_LookupMiss(PRTDBGMODDWARF pThis, uint32_t uCode)
+{
+    /*
+     * There is no entry with code zero.
+     */
+    if (!uCode)
+        return NULL;
+
+    /*
+     * Resize the cache array if the code is considered cachable.
+     */
+    bool fFillCache = true;
+    if (pThis->cCachedAbbrevsAlloced < uCode)
+    {
+        if (uCode >= _64K)
+            fFillCache = false;
+        else
+        {
+            uint32_t cNew = RT_ALIGN(uCode, 64);
+            void *pv = RTMemRealloc(pThis->paCachedAbbrevs, sizeof(pThis->paCachedAbbrevs[0]) * cNew);
+            if (!pv)
+                fFillCache = false;
+            else
+            {
+                Log(("rtDwarfAbbrev_LookupMiss: Growing from %u to %u...\n", pThis->cCachedAbbrevsAlloced, cNew));
+                pThis->paCachedAbbrevs       = (PRTDWARFABBREV)pv;
+                for (uint32_t i = pThis->cCachedAbbrevsAlloced; i < cNew; i++)
+                    pThis->paCachedAbbrevs[i].offAbbrev = UINT32_MAX;
+                pThis->cCachedAbbrevsAlloced = cNew;
+            }
+        }
+    }
+
+    /*
+     * Walk the abbreviations till we find the desired code.
+     */
+    RTDWARFCURSOR Cursor;
+    int rc = rtDwarfCursor_InitWithOffset(&Cursor, pThis, krtDbgModDwarfSect_abbrev, pThis->offCachedAbbrev);
+    if (RT_FAILURE(rc))
+        return NULL;
+
+    PRTDWARFABBREV pRet = NULL;
+    if (fFillCache)
+    {
+        /*
+         * Search for the entry and fill the cache while doing so.
+         * We assume that abbreviation codes for a unit will stop when we see
+         * zero code or when the code value drops.
+         */
+        uint32_t uPrevCode = 0;
+        for (;;)
+        {
+            /* Read the 'header'. Skipping zero code bytes. */
+#ifdef LOG_ENABLED
+            uint32_t const offStart = rtDwarfCursor_CalcSectOffsetU32(&Cursor);
+#endif
+            uint32_t const uCurCode = rtDwarfCursor_GetULeb128AsU32(&Cursor, 0);
+            if (pRet && (uCurCode == 0 || uCurCode < uPrevCode))
+                break; /* probably end of unit. */
+            if (uCurCode != 0)
+            {
+                uint32_t const uCurTag   = rtDwarfCursor_GetULeb128AsU32(&Cursor, 0);
+                uint8_t  const uChildren = rtDwarfCursor_GetU8(&Cursor, 0);
+                if (RT_FAILURE(Cursor.rc))
+                    break;
+                if (   uCurTag > 0xffff
+                    || uChildren > 1)
+                {
+                    Cursor.rc = VERR_DWARF_BAD_ABBREV;
+                    break;
+                }
+
+                /* Cache it? */
+                if (uCurCode <= pThis->cCachedAbbrevsAlloced)
+                {
+                    PRTDWARFABBREV pEntry = &pThis->paCachedAbbrevs[uCurCode - 1];
+                    if (pEntry->offAbbrev != pThis->offCachedAbbrev)
+                    {
+                        pEntry->offAbbrev = pThis->offCachedAbbrev;
+                        pEntry->fChildren = RT_BOOL(uChildren);
+                        pEntry->uTag      = uCurTag;
+                        pEntry->offSpec   = rtDwarfCursor_CalcSectOffsetU32(&Cursor);
+#ifdef LOG_ENABLED
+                        pEntry->cbHdr     = (uint8_t)(pEntry->offSpec - offStart);
+                        Log7(("rtDwarfAbbrev_LookupMiss(%#x): fill: %#x: uTag=%#x offAbbrev=%#x%s\n",
+                              uCode, offStart, pEntry->uTag, pEntry->offAbbrev, pEntry->fChildren ? " has-children" : ""));
+#endif
+                        if (uCurCode == uCode)
+                        {
+                            Assert(!pRet);
+                            pRet = pEntry;
+                            if (uCurCode == pThis->cCachedAbbrevsAlloced)
+                                break;
+                        }
+                    }
+                    else if (pRet)
+                        break; /* Next unit, don't cache more. */
+                    /* else: We're growing the cache and re-reading old data. */
+                }
+
+                /* Skip the specification. */
+                uint32_t uAttr, uForm;
+                do
+                {
+                    uAttr = rtDwarfCursor_GetULeb128AsU32(&Cursor, 0);
+                    uForm = rtDwarfCursor_GetULeb128AsU32(&Cursor, 0);
+                } while (uAttr != 0);
+            }
+            if (RT_FAILURE(Cursor.rc))
+                break;
+
+            /* Done? (Maximize cache filling.) */
+            if (   pRet != NULL
+                && uCurCode >= pThis->cCachedAbbrevsAlloced)
+                break;
+            uPrevCode = uCurCode;
+        }
+        if (pRet)
+            Log6(("rtDwarfAbbrev_LookupMiss(%#x): uTag=%#x offSpec=%#x offAbbrev=%#x [fill]\n",
+                  uCode, pRet->uTag, pRet->offSpec, pRet->offAbbrev));
+        else
+            Log6(("rtDwarfAbbrev_LookupMiss(%#x): failed [fill]\n", uCode));
+    }
+    else
+    {
+        /*
+         * Search for the entry with the desired code, no cache filling.
+         */
+        for (;;)
+        {
+            /* Read the 'header'. */
+#ifdef LOG_ENABLED
+            uint32_t const offStart  = rtDwarfCursor_CalcSectOffsetU32(&Cursor);
+#endif
+            uint32_t const uCurCode  = rtDwarfCursor_GetULeb128AsU32(&Cursor, 0);
+            uint32_t const uCurTag   = rtDwarfCursor_GetULeb128AsU32(&Cursor, 0);
+            uint8_t  const uChildren = rtDwarfCursor_GetU8(&Cursor, 0);
+            if (RT_FAILURE(Cursor.rc))
+                break;
+            if (   uCurTag > 0xffff
+                || uChildren > 1)
+            {
+                Cursor.rc = VERR_DWARF_BAD_ABBREV;
+                break;
+            }
+
+            /* Do we have a match? */
+            if (uCurCode == uCode)
+            {
+                pRet = &pThis->LookupAbbrev;
+                pRet->fChildren = RT_BOOL(uChildren);
+                pRet->uTag      = uCurTag;
+                pRet->offSpec   = rtDwarfCursor_CalcSectOffsetU32(&Cursor);
+                pRet->offAbbrev = pThis->offCachedAbbrev;
+#ifdef LOG_ENABLED
+                pRet->cbHdr     = (uint8_t)(pRet->offSpec - offStart);
+#endif
+                break;
+            }
+
+            /* Skip the specification. */
+            uint32_t uAttr, uForm;
+            do
+            {
+                uAttr = rtDwarfCursor_GetULeb128AsU32(&Cursor, 0);
+                uForm = rtDwarfCursor_GetULeb128AsU32(&Cursor, 0);
+            } while (uAttr != 0);
+            if (RT_FAILURE(Cursor.rc))
+                break;
+        }
+        if (pRet)
+            Log6(("rtDwarfAbbrev_LookupMiss(%#x): uTag=%#x offSpec=%#x offAbbrev=%#x [no-fill]\n",
+                  uCode, pRet->uTag, pRet->offSpec, pRet->offAbbrev));
+        else
+            Log6(("rtDwarfAbbrev_LookupMiss(%#x): failed [no-fill]\n", uCode));
+    }
+
+    rtDwarfCursor_Delete(&Cursor, VINF_SUCCESS);
+    return pRet;
+}
+
+
+/**
+ * Looks up an abbreviation.
+ *
+ * @returns Pointer to abbreviation cache entry (read only).  May be rendered
+ *          invalid by subsequent calls to this function.
+ * @param   pThis               The DWARF instance.
+ * @param   uCode               The abbreviation code to lookup.
+ */
+static PCRTDWARFABBREV rtDwarfAbbrev_Lookup(PRTDBGMODDWARF pThis, uint32_t uCode)
+{
+    uCode -= 1;
+    if (uCode < pThis->cCachedAbbrevsAlloced)
+    {
+        if (pThis->paCachedAbbrevs[uCode].offAbbrev == pThis->offCachedAbbrev)
+            return &pThis->paCachedAbbrevs[uCode];
+    }
+    return rtDwarfAbbrev_LookupMiss(pThis, uCode + 1);
+}
+
+
+/**
+ * Sets the abbreviation offset of the current unit.
+ *
+ * @param   pThis               The DWARF instance.
+ * @param   offAbbrev           The offset into the abbreviation section.
+ */
+static void rtDwarfAbbrev_SetUnitOffset(PRTDBGMODDWARF pThis, uint32_t offAbbrev)
+{
+    pThis->offCachedAbbrev = offAbbrev;
+}
+
+
+
+/*
+ *
+ * DIE Attribute Parsers.
+ * DIE Attribute Parsers.
+ * DIE Attribute Parsers.
+ *
+ */
+
+/**
+ * Gets the compilation unit a DIE belongs to.
+ *
+ * @returns The compilation unit DIE.
+ * @param   pDie                Some DIE in the unit.
+ */
+static PRTDWARFDIECOMPILEUNIT rtDwarfDie_GetCompileUnit(PRTDWARFDIE pDie)
+{
+    while (pDie->pParent)
+        pDie = pDie->pParent;
+    AssertReturn(   pDie->uTag == DW_TAG_compile_unit
+                 || pDie->uTag == DW_TAG_partial_unit,
+                 NULL);
+    return (PRTDWARFDIECOMPILEUNIT)pDie;
+}
+
+
+/**
+ * Resolves a string section (debug_str) reference.
+ *
+ * @returns Pointer to the string (inside the string section).
+ * @param   pThis               The DWARF instance.
+ * @param   pCursor             The cursor.
+ * @param   pszErrValue         What to return on failure (@a
+ *                              pCursor->rc is set).
+ */
+static const char *rtDwarfDecodeHlp_GetStrp(PRTDBGMODDWARF pThis, PRTDWARFCURSOR pCursor, const char *pszErrValue)
+{
+    uint64_t offDebugStr = rtDwarfCursor_GetUOff(pCursor, UINT64_MAX);
+    if (RT_FAILURE(pCursor->rc))
+        return pszErrValue;
+
+    if (offDebugStr >= pThis->aSections[krtDbgModDwarfSect_str].cb)
+    {
+        /* Ugly: Exploit the cursor status field for reporting errors. */
+        pCursor->rc = VERR_DWARF_BAD_INFO;
+        return pszErrValue;
+    }
+
+    if (!pThis->aSections[krtDbgModDwarfSect_str].pv)
+    {
+        int rc = rtDbgModDwarfLoadSection(pThis, krtDbgModDwarfSect_str);
+        if (RT_FAILURE(rc))
+        {
+            /* Ugly: Exploit the cursor status field for reporting errors. */
+            pCursor->rc = rc;
+            return pszErrValue;
+        }
+    }
+
+    return (const char *)pThis->aSections[krtDbgModDwarfSect_str].pv + (size_t)offDebugStr;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_Address(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                               uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    AssertReturn(ATTR_GET_SIZE(pDesc) == sizeof(RTDWARFADDR), VERR_INTERNAL_ERROR_3);
+    NOREF(pDie);
+
+    uint64_t uAddr;
+    switch (uForm)
+    {
+        case DW_FORM_addr:  uAddr = rtDwarfCursor_GetNativeUOff(pCursor, 0); break;
+        case DW_FORM_data1: uAddr = rtDwarfCursor_GetU8(pCursor, 0); break;
+        case DW_FORM_data2: uAddr = rtDwarfCursor_GetU16(pCursor, 0); break;
+        case DW_FORM_data4: uAddr = rtDwarfCursor_GetU32(pCursor, 0); break;
+        case DW_FORM_data8: uAddr = rtDwarfCursor_GetU64(pCursor, 0); break;
+        case DW_FORM_udata: uAddr = rtDwarfCursor_GetULeb128(pCursor, 0); break;
+        default:
+            AssertMsgFailedReturn(("%#x (%s)\n", uForm, rtDwarfLog_FormName(uForm)), VERR_DWARF_UNEXPECTED_FORM);
+    }
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+
+    PRTDWARFADDR pAddr = (PRTDWARFADDR)pbMember;
+    pAddr->uAddress = uAddr;
+
+    Log4(("          %-20s  %#010llx  [%s]\n", rtDwarfLog_AttrName(pDesc->uAttr), uAddr, rtDwarfLog_FormName(uForm)));
+    return VINF_SUCCESS;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_Bool(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                            uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    AssertReturn(ATTR_GET_SIZE(pDesc) == sizeof(bool), VERR_INTERNAL_ERROR_3);
+    NOREF(pDie);
+
+    bool *pfMember = (bool *)pbMember;
+    switch (uForm)
+    {
+        case DW_FORM_flag:
+        {
+            uint8_t b = rtDwarfCursor_GetU8(pCursor, UINT8_MAX);
+            if (b > 1)
+            {
+                Log(("Unexpected boolean value %#x\n", b));
+                return RT_FAILURE(pCursor->rc) ? pCursor->rc : pCursor->rc = VERR_DWARF_BAD_INFO;
+            }
+            *pfMember = RT_BOOL(b);
+            break;
+        }
+
+        case DW_FORM_flag_present:
+            *pfMember = true;
+            break;
+
+        default:
+            AssertMsgFailedReturn(("%#x\n", uForm), VERR_DWARF_UNEXPECTED_FORM);
+    }
+
+    Log4(("          %-20s  %RTbool  [%s]\n", rtDwarfLog_AttrName(pDesc->uAttr), *pfMember, rtDwarfLog_FormName(uForm)));
+    return VINF_SUCCESS;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_LowHighPc(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                                 uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    AssertReturn(ATTR_GET_SIZE(pDesc) == sizeof(RTDWARFADDRRANGE), VERR_INTERNAL_ERROR_3);
+    AssertReturn(pDesc->uAttr == DW_AT_low_pc || pDesc->uAttr == DW_AT_high_pc, VERR_INTERNAL_ERROR_3);
+    NOREF(pDie);
+
+    uint64_t uAddr;
+    switch (uForm)
+    {
+        case DW_FORM_addr:  uAddr = rtDwarfCursor_GetNativeUOff(pCursor, 0); break;
+        case DW_FORM_data1: uAddr = rtDwarfCursor_GetU8(pCursor, 0); break;
+        case DW_FORM_data2: uAddr = rtDwarfCursor_GetU16(pCursor, 0); break;
+        case DW_FORM_data4: uAddr = rtDwarfCursor_GetU32(pCursor, 0); break;
+        case DW_FORM_data8: uAddr = rtDwarfCursor_GetU64(pCursor, 0); break;
+        case DW_FORM_udata: uAddr = rtDwarfCursor_GetULeb128(pCursor, 0); break;
+        default:
+            AssertMsgFailedReturn(("%#x\n", uForm), VERR_DWARF_UNEXPECTED_FORM);
+    }
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+
+    PRTDWARFADDRRANGE pRange = (PRTDWARFADDRRANGE)pbMember;
+    if (pDesc->uAttr == DW_AT_low_pc)
+    {
+        if (pRange->fHaveLowAddress)
+        {
+            Log(("rtDwarfDecode_LowHighPc: Duplicate DW_AT_low_pc\n"));
+            return pCursor->rc = VERR_DWARF_BAD_INFO;
+        }
+        pRange->fHaveLowAddress  = true;
+        pRange->uLowAddress      = uAddr;
+    }
+    else
+    {
+        if (pRange->fHaveHighAddress)
+        {
+            Log(("rtDwarfDecode_LowHighPc: Duplicate DW_AT_high_pc\n"));
+            return pCursor->rc = VERR_DWARF_BAD_INFO;
+        }
+        pRange->fHaveHighAddress = true;
+        pRange->fHaveHighIsAddress = uForm == DW_FORM_addr;
+        if (!pRange->fHaveHighIsAddress && pRange->fHaveLowAddress)
+        {
+            pRange->fHaveHighIsAddress = true;
+            pRange->uHighAddress     = uAddr + pRange->uLowAddress;
+        }
+        else
+            pRange->uHighAddress     = uAddr;
+
+    }
+    pRange->cAttrs++;
+
+    Log4(("          %-20s  %#010llx  [%s]\n", rtDwarfLog_AttrName(pDesc->uAttr), uAddr, rtDwarfLog_FormName(uForm)));
+    return VINF_SUCCESS;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_Ranges(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                              uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    AssertReturn(ATTR_GET_SIZE(pDesc) == sizeof(RTDWARFADDRRANGE), VERR_INTERNAL_ERROR_3);
+    AssertReturn(pDesc->uAttr == DW_AT_ranges, VERR_INTERNAL_ERROR_3);
+    NOREF(pDie);
+
+    /* Decode it. */
+    uint64_t off;
+    switch (uForm)
+    {
+        case DW_FORM_addr:          off = rtDwarfCursor_GetNativeUOff(pCursor, 0); break;
+        case DW_FORM_data4:         off = rtDwarfCursor_GetU32(pCursor, 0); break;
+        case DW_FORM_data8:         off = rtDwarfCursor_GetU64(pCursor, 0); break;
+        case DW_FORM_sec_offset:    off = rtDwarfCursor_GetUOff(pCursor, 0); break;
+        default:
+            AssertMsgFailedReturn(("%#x\n", uForm), VERR_DWARF_UNEXPECTED_FORM);
+    }
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+
+    /* Validate the offset and load the ranges. */
+    PRTDBGMODDWARF pThis = pCursor->pDwarfMod;
+    if (off >= pThis->aSections[krtDbgModDwarfSect_ranges].cb)
+    {
+        Log(("rtDwarfDecode_Ranges: bad ranges off=%#llx\n", off));
+        return pCursor->rc = VERR_DWARF_BAD_POS;
+    }
+
+    if (!pThis->aSections[krtDbgModDwarfSect_ranges].pv)
+    {
+        int rc = rtDbgModDwarfLoadSection(pThis, krtDbgModDwarfSect_ranges);
+        if (RT_FAILURE(rc))
+            return pCursor->rc = rc;
+    }
+
+    /* Store the result. */
+    PRTDWARFADDRRANGE pRange = (PRTDWARFADDRRANGE)pbMember;
+    if (pRange->fHaveRanges)
+    {
+        Log(("rtDwarfDecode_Ranges: Duplicate DW_AT_ranges\n"));
+        return pCursor->rc = VERR_DWARF_BAD_INFO;
+    }
+    pRange->fHaveRanges = true;
+    pRange->cAttrs++;
+    pRange->pbRanges    = (uint8_t const *)pThis->aSections[krtDbgModDwarfSect_ranges].pv + (size_t)off;
+
+    Log4(("          %-20s  TODO  [%s]\n", rtDwarfLog_AttrName(pDesc->uAttr), rtDwarfLog_FormName(uForm)));
+    return VINF_SUCCESS;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_Reference(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                                 uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    AssertReturn(ATTR_GET_SIZE(pDesc) == sizeof(RTDWARFREF), VERR_INTERNAL_ERROR_3);
+
+    /* Decode it. */
+    uint64_t        off;
+    krtDwarfRef     enmWrt = krtDwarfRef_SameUnit;
+    switch (uForm)
+    {
+        case DW_FORM_ref1:          off = rtDwarfCursor_GetU8(pCursor, 0); break;
+        case DW_FORM_ref2:          off = rtDwarfCursor_GetU16(pCursor, 0); break;
+        case DW_FORM_ref4:          off = rtDwarfCursor_GetU32(pCursor, 0); break;
+        case DW_FORM_ref8:          off = rtDwarfCursor_GetU64(pCursor, 0); break;
+        case DW_FORM_ref_udata:     off = rtDwarfCursor_GetULeb128(pCursor, 0); break;
+
+        case DW_FORM_ref_addr:
+            enmWrt = krtDwarfRef_InfoSection;
+            off = rtDwarfCursor_GetUOff(pCursor, 0);
+            break;
+
+        case DW_FORM_ref_sig8:
+            enmWrt = krtDwarfRef_TypeId64;
+            off = rtDwarfCursor_GetU64(pCursor, 0);
+            break;
+
+        default:
+            AssertMsgFailedReturn(("%#x\n", uForm), VERR_DWARF_UNEXPECTED_FORM);
+    }
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+
+    /* Validate the offset and convert to debug_info relative offsets. */
+    if (enmWrt == krtDwarfRef_InfoSection)
+    {
+        if (off >= pCursor->pDwarfMod->aSections[krtDbgModDwarfSect_info].cb)
+        {
+            Log(("rtDwarfDecode_Reference: bad info off=%#llx\n", off));
+            return pCursor->rc = VERR_DWARF_BAD_POS;
+        }
+    }
+    else if (enmWrt == krtDwarfRef_SameUnit)
+    {
+        PRTDWARFDIECOMPILEUNIT pUnit = rtDwarfDie_GetCompileUnit(pDie);
+        if (off >= pUnit->cbUnit)
+        {
+            Log(("rtDwarfDecode_Reference: bad unit off=%#llx\n", off));
+            return pCursor->rc = VERR_DWARF_BAD_POS;
+        }
+        off += pUnit->offUnit;
+        enmWrt = krtDwarfRef_InfoSection;
+    }
+    /* else: not bother verifying/resolving the indirect type reference yet. */
+
+    /* Store it */
+    PRTDWARFREF pRef = (PRTDWARFREF)pbMember;
+    pRef->enmWrt = enmWrt;
+    pRef->off    = off;
+
+    Log4(("          %-20s  %d:%#010llx  [%s]\n", rtDwarfLog_AttrName(pDesc->uAttr), enmWrt, off, rtDwarfLog_FormName(uForm)));
+    return VINF_SUCCESS;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_SectOff(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                               uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    AssertReturn(ATTR_GET_SIZE(pDesc) == sizeof(RTDWARFREF), VERR_INTERNAL_ERROR_3);
+    NOREF(pDie);
+
+    uint64_t off;
+    switch (uForm)
+    {
+        case DW_FORM_data4:      off = rtDwarfCursor_GetU32(pCursor, 0);  break;
+        case DW_FORM_data8:      off = rtDwarfCursor_GetU64(pCursor, 0);  break;
+        case DW_FORM_sec_offset: off = rtDwarfCursor_GetUOff(pCursor, 0); break;
+        default:
+            AssertMsgFailedReturn(("%#x (%s)\n", uForm, rtDwarfLog_FormName(uForm)), VERR_DWARF_UNEXPECTED_FORM);
+    }
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+
+    krtDbgModDwarfSect  enmSect;
+    krtDwarfRef         enmWrt;
+    switch (pDesc->uAttr)
+    {
+        case DW_AT_stmt_list:   enmSect = krtDbgModDwarfSect_line;    enmWrt = krtDwarfRef_LineSection;    break;
+        case DW_AT_macro_info:  enmSect = krtDbgModDwarfSect_loc;     enmWrt = krtDwarfRef_LocSection;     break;
+        case DW_AT_ranges:      enmSect = krtDbgModDwarfSect_ranges;  enmWrt = krtDwarfRef_RangesSection;  break;
+        default:
+            AssertMsgFailedReturn(("%u (%s)\n", pDesc->uAttr, rtDwarfLog_AttrName(pDesc->uAttr)), VERR_INTERNAL_ERROR_4);
+    }
+    size_t cbSect = pCursor->pDwarfMod->aSections[enmSect].cb;
+    if (off >= cbSect)
+    {
+        /* Watcom generates offset past the end of the section, increasing the
+           offset by one for each compile unit. So, just fudge it. */
+        Log(("rtDwarfDecode_SectOff: bad off=%#llx, attr %#x (%s), enmSect=%d cb=%#llx; Assuming watcom/gcc.\n", off,
+             pDesc->uAttr, rtDwarfLog_AttrName(pDesc->uAttr), enmSect, cbSect));
+        off = cbSect;
+    }
+
+    PRTDWARFREF pRef = (PRTDWARFREF)pbMember;
+    pRef->enmWrt = enmWrt;
+    pRef->off    = off;
+
+    Log4(("          %-20s  %d:%#010llx  [%s]\n", rtDwarfLog_AttrName(pDesc->uAttr), enmWrt, off, rtDwarfLog_FormName(uForm)));
+    return VINF_SUCCESS;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_String(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                              uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    AssertReturn(ATTR_GET_SIZE(pDesc) == sizeof(const char *), VERR_INTERNAL_ERROR_3);
+    NOREF(pDie);
+
+    const char *psz;
+    switch (uForm)
+    {
+        case DW_FORM_string:
+            psz = rtDwarfCursor_GetSZ(pCursor, NULL);
+            break;
+
+        case DW_FORM_strp:
+            psz = rtDwarfDecodeHlp_GetStrp(pCursor->pDwarfMod, pCursor, NULL);
+            break;
+
+        default:
+            AssertMsgFailedReturn(("%#x\n", uForm), VERR_DWARF_UNEXPECTED_FORM);
+    }
+
+    *(const char **)pbMember = psz;
+    Log4(("          %-20s  '%s'  [%s]\n", rtDwarfLog_AttrName(pDesc->uAttr), psz, rtDwarfLog_FormName(uForm)));
+    return pCursor->rc;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_UnsignedInt(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                                   uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    NOREF(pDie);
+    uint64_t u64Val;
+    switch (uForm)
+    {
+        case DW_FORM_udata: u64Val = rtDwarfCursor_GetULeb128(pCursor, 0); break;
+        case DW_FORM_data1: u64Val = rtDwarfCursor_GetU8(pCursor, 0); break;
+        case DW_FORM_data2: u64Val = rtDwarfCursor_GetU16(pCursor, 0); break;
+        case DW_FORM_data4: u64Val = rtDwarfCursor_GetU32(pCursor, 0); break;
+        case DW_FORM_data8: u64Val = rtDwarfCursor_GetU64(pCursor, 0); break;
+        default:
+            AssertMsgFailedReturn(("%#x\n", uForm), VERR_DWARF_UNEXPECTED_FORM);
+    }
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+
+    switch (ATTR_GET_SIZE(pDesc))
+    {
+        case 1:
+            *pbMember = (uint8_t)u64Val;
+            if (*pbMember != u64Val)
+            {
+                AssertFailed();
+                return VERR_OUT_OF_RANGE;
+            }
+            break;
+
+        case 2:
+            *(uint16_t *)pbMember = (uint16_t)u64Val;
+            if (*(uint16_t *)pbMember != u64Val)
+            {
+                AssertFailed();
+                return VERR_OUT_OF_RANGE;
+            }
+            break;
+
+        case 4:
+            *(uint32_t *)pbMember = (uint32_t)u64Val;
+            if (*(uint32_t *)pbMember != u64Val)
+            {
+                AssertFailed();
+                return VERR_OUT_OF_RANGE;
+            }
+            break;
+
+        case 8:
+            *(uint64_t *)pbMember = (uint64_t)u64Val;
+            if (*(uint64_t *)pbMember != u64Val)
+            {
+                AssertFailed();
+                return VERR_OUT_OF_RANGE;
+            }
+            break;
+
+        default:
+            AssertMsgFailedReturn(("%#x\n", ATTR_GET_SIZE(pDesc)), VERR_INTERNAL_ERROR_2);
+    }
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Initialize location interpreter state from cursor & form.
+ *
+ * @returns IPRT status code.
+ * @retval  VERR_NOT_FOUND if no location information (i.e. there is source but
+ *          it resulted in no byte code).
+ * @param   pLoc                The location state structure to initialize.
+ * @param   pCursor             The cursor to read from.
+ * @param   uForm               The attribute form.
+ */
+static int rtDwarfLoc_Init(PRTDWARFLOCST pLoc, PRTDWARFCURSOR pCursor, uint32_t uForm)
+{
+    uint32_t cbBlock;
+    switch (uForm)
+    {
+        case DW_FORM_block1:
+            cbBlock = rtDwarfCursor_GetU8(pCursor, 0);
+            break;
+
+        case DW_FORM_block2:
+            cbBlock = rtDwarfCursor_GetU16(pCursor, 0);
+            break;
+
+        case DW_FORM_block4:
+            cbBlock = rtDwarfCursor_GetU32(pCursor, 0);
+            break;
+
+        case DW_FORM_block:
+            cbBlock = rtDwarfCursor_GetULeb128(pCursor, 0);
+            break;
+
+        default:
+            AssertMsgFailedReturn(("uForm=%#x\n", uForm), VERR_DWARF_UNEXPECTED_FORM);
+    }
+    if (!cbBlock)
+        return VERR_NOT_FOUND;
+
+    int rc = rtDwarfCursor_InitForBlock(&pLoc->Cursor, pCursor, cbBlock);
+    if (RT_FAILURE(rc))
+        return rc;
+    pLoc->iTop = -1;
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Pushes a value onto the stack.
+ *
+ * @returns VINF_SUCCESS or VERR_DWARF_STACK_OVERFLOW.
+ * @param   pLoc                The state.
+ * @param   uValue              The value to push.
+ */
+static int rtDwarfLoc_Push(PRTDWARFLOCST pLoc, uint64_t uValue)
+{
+    int iTop = pLoc->iTop + 1;
+    AssertReturn((unsigned)iTop < RT_ELEMENTS(pLoc->auStack), VERR_DWARF_STACK_OVERFLOW);
+    pLoc->auStack[iTop] = uValue;
+    pLoc->iTop = iTop;
+    return VINF_SUCCESS;
+}
+
+
+static int rtDwarfLoc_Evaluate(PRTDWARFLOCST pLoc, void *pvLater, void *pvUser)
+{
+    RT_NOREF_PV(pvLater); RT_NOREF_PV(pvUser);
+
+    while (!rtDwarfCursor_IsAtEndOfUnit(&pLoc->Cursor))
+    {
+        /* Read the next opcode.*/
+        uint8_t const bOpcode = rtDwarfCursor_GetU8(&pLoc->Cursor, 0);
+
+        /* Get its operands. */
+        uint64_t uOperand1 = 0;
+        uint64_t uOperand2 = 0;
+        switch (bOpcode)
+        {
+            case DW_OP_addr:
+                uOperand1 = rtDwarfCursor_GetNativeUOff(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_pick:
+            case DW_OP_const1u:
+            case DW_OP_deref_size:
+            case DW_OP_xderef_size:
+                uOperand1 = rtDwarfCursor_GetU8(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_const1s:
+                uOperand1 = (int8_t)rtDwarfCursor_GetU8(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_const2u:
+                uOperand1 = rtDwarfCursor_GetU16(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_skip:
+            case DW_OP_bra:
+            case DW_OP_const2s:
+                uOperand1 = (int16_t)rtDwarfCursor_GetU16(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_const4u:
+                uOperand1 = rtDwarfCursor_GetU32(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_const4s:
+                uOperand1 = (int32_t)rtDwarfCursor_GetU32(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_const8u:
+                uOperand1 = rtDwarfCursor_GetU64(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_const8s:
+                uOperand1 = rtDwarfCursor_GetU64(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_regx:
+            case DW_OP_piece:
+            case DW_OP_plus_uconst:
+            case DW_OP_constu:
+                uOperand1 = rtDwarfCursor_GetULeb128(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_consts:
+            case DW_OP_fbreg:
+            case DW_OP_breg0+0: case DW_OP_breg0+1: case DW_OP_breg0+2: case DW_OP_breg0+3:
+            case DW_OP_breg0+4: case DW_OP_breg0+5: case DW_OP_breg0+6: case DW_OP_breg0+7:
+            case DW_OP_breg0+8: case DW_OP_breg0+9: case DW_OP_breg0+10: case DW_OP_breg0+11:
+            case DW_OP_breg0+12: case DW_OP_breg0+13: case DW_OP_breg0+14: case DW_OP_breg0+15:
+            case DW_OP_breg0+16: case DW_OP_breg0+17: case DW_OP_breg0+18: case DW_OP_breg0+19:
+            case DW_OP_breg0+20: case DW_OP_breg0+21: case DW_OP_breg0+22: case DW_OP_breg0+23:
+            case DW_OP_breg0+24: case DW_OP_breg0+25: case DW_OP_breg0+26: case DW_OP_breg0+27:
+            case DW_OP_breg0+28: case DW_OP_breg0+29: case DW_OP_breg0+30: case DW_OP_breg0+31:
+                uOperand1 = rtDwarfCursor_GetSLeb128(&pLoc->Cursor, 0);
+                break;
+            case DW_OP_bregx:
+                uOperand1 = rtDwarfCursor_GetULeb128(&pLoc->Cursor, 0);
+                uOperand2 = rtDwarfCursor_GetSLeb128(&pLoc->Cursor, 0);
+                break;
+        }
+        if (RT_FAILURE(pLoc->Cursor.rc))
+            break;
+
+        /* Interpret the opcode. */
+        int rc;
+        switch (bOpcode)
+        {
+            case DW_OP_const1u:
+            case DW_OP_const1s:
+            case DW_OP_const2u:
+            case DW_OP_const2s:
+            case DW_OP_const4u:
+            case DW_OP_const4s:
+            case DW_OP_const8u:
+            case DW_OP_const8s:
+            case DW_OP_constu:
+            case DW_OP_consts:
+            case DW_OP_addr:
+                rc = rtDwarfLoc_Push(pLoc, uOperand1);
+                break;
+            case DW_OP_lit0 +  0: case DW_OP_lit0 +  1: case DW_OP_lit0 +  2: case DW_OP_lit0 +  3:
+            case DW_OP_lit0 +  4: case DW_OP_lit0 +  5: case DW_OP_lit0 +  6: case DW_OP_lit0 +  7:
+            case DW_OP_lit0 +  8: case DW_OP_lit0 +  9: case DW_OP_lit0 + 10: case DW_OP_lit0 + 11:
+            case DW_OP_lit0 + 12: case DW_OP_lit0 + 13: case DW_OP_lit0 + 14: case DW_OP_lit0 + 15:
+            case DW_OP_lit0 + 16: case DW_OP_lit0 + 17: case DW_OP_lit0 + 18: case DW_OP_lit0 + 19:
+            case DW_OP_lit0 + 20: case DW_OP_lit0 + 21: case DW_OP_lit0 + 22: case DW_OP_lit0 + 23:
+            case DW_OP_lit0 + 24: case DW_OP_lit0 + 25: case DW_OP_lit0 + 26: case DW_OP_lit0 + 27:
+            case DW_OP_lit0 + 28: case DW_OP_lit0 + 29: case DW_OP_lit0 + 30: case DW_OP_lit0 + 31:
+                rc = rtDwarfLoc_Push(pLoc, bOpcode - DW_OP_lit0);
+                break;
+            case DW_OP_nop:
+                break;
+            case DW_OP_dup:               /** @todo 0 operands. */
+            case DW_OP_drop:              /** @todo 0 operands. */
+            case DW_OP_over:              /** @todo 0 operands. */
+            case DW_OP_pick:              /** @todo 1 operands, a 1-byte stack index. */
+            case DW_OP_swap:              /** @todo 0 operands. */
+            case DW_OP_rot:               /** @todo 0 operands. */
+            case DW_OP_abs:               /** @todo 0 operands. */
+            case DW_OP_and:               /** @todo 0 operands. */
+            case DW_OP_div:               /** @todo 0 operands. */
+            case DW_OP_minus:             /** @todo 0 operands. */
+            case DW_OP_mod:               /** @todo 0 operands. */
+            case DW_OP_mul:               /** @todo 0 operands. */
+            case DW_OP_neg:               /** @todo 0 operands. */
+            case DW_OP_not:               /** @todo 0 operands. */
+            case DW_OP_or:                /** @todo 0 operands. */
+            case DW_OP_plus:              /** @todo 0 operands. */
+            case DW_OP_plus_uconst:       /** @todo 1 operands, a ULEB128 addend. */
+            case DW_OP_shl:               /** @todo 0 operands. */
+            case DW_OP_shr:               /** @todo 0 operands. */
+            case DW_OP_shra:              /** @todo 0 operands. */
+            case DW_OP_xor:               /** @todo 0 operands. */
+            case DW_OP_skip:              /** @todo 1 signed 2-byte constant. */
+            case DW_OP_bra:               /** @todo 1 signed 2-byte constant. */
+            case DW_OP_eq:                /** @todo 0 operands. */
+            case DW_OP_ge:                /** @todo 0 operands. */
+            case DW_OP_gt:                /** @todo 0 operands. */
+            case DW_OP_le:                /** @todo 0 operands. */
+            case DW_OP_lt:                /** @todo 0 operands. */
+            case DW_OP_ne:                /** @todo 0 operands. */
+            case DW_OP_reg0 +  0: case DW_OP_reg0 +  1: case DW_OP_reg0 +  2: case DW_OP_reg0 +  3: /** @todo 0 operands - reg 0..31. */
+            case DW_OP_reg0 +  4: case DW_OP_reg0 +  5: case DW_OP_reg0 +  6: case DW_OP_reg0 +  7:
+            case DW_OP_reg0 +  8: case DW_OP_reg0 +  9: case DW_OP_reg0 + 10: case DW_OP_reg0 + 11:
+            case DW_OP_reg0 + 12: case DW_OP_reg0 + 13: case DW_OP_reg0 + 14: case DW_OP_reg0 + 15:
+            case DW_OP_reg0 + 16: case DW_OP_reg0 + 17: case DW_OP_reg0 + 18: case DW_OP_reg0 + 19:
+            case DW_OP_reg0 + 20: case DW_OP_reg0 + 21: case DW_OP_reg0 + 22: case DW_OP_reg0 + 23:
+            case DW_OP_reg0 + 24: case DW_OP_reg0 + 25: case DW_OP_reg0 + 26: case DW_OP_reg0 + 27:
+            case DW_OP_reg0 + 28: case DW_OP_reg0 + 29: case DW_OP_reg0 + 30: case DW_OP_reg0 + 31:
+            case DW_OP_breg0+  0: case DW_OP_breg0+  1: case DW_OP_breg0+  2: case DW_OP_breg0+  3: /** @todo 1 operand, a SLEB128 offset. */
+            case DW_OP_breg0+  4: case DW_OP_breg0+  5: case DW_OP_breg0+  6: case DW_OP_breg0+  7:
+            case DW_OP_breg0+  8: case DW_OP_breg0+  9: case DW_OP_breg0+ 10: case DW_OP_breg0+ 11:
+            case DW_OP_breg0+ 12: case DW_OP_breg0+ 13: case DW_OP_breg0+ 14: case DW_OP_breg0+ 15:
+            case DW_OP_breg0+ 16: case DW_OP_breg0+ 17: case DW_OP_breg0+ 18: case DW_OP_breg0+ 19:
+            case DW_OP_breg0+ 20: case DW_OP_breg0+ 21: case DW_OP_breg0+ 22: case DW_OP_breg0+ 23:
+            case DW_OP_breg0+ 24: case DW_OP_breg0+ 25: case DW_OP_breg0+ 26: case DW_OP_breg0+ 27:
+            case DW_OP_breg0+ 28: case DW_OP_breg0+ 29: case DW_OP_breg0+ 30: case DW_OP_breg0+ 31:
+            case DW_OP_piece:             /** @todo 1 operand, a ULEB128 size of piece addressed. */
+            case DW_OP_regx:              /** @todo 1 operand, a ULEB128 register. */
+            case DW_OP_fbreg:             /** @todo 1 operand, a SLEB128 offset. */
+            case DW_OP_bregx:             /** @todo 2 operands, a ULEB128 register followed by a SLEB128 offset. */
+            case DW_OP_deref:             /** @todo 0 operands. */
+            case DW_OP_deref_size:        /** @todo 1 operand, a 1-byte size of data retrieved. */
+            case DW_OP_xderef:            /** @todo 0 operands. */
+            case DW_OP_xderef_size:        /** @todo 1 operand, a 1-byte size of data retrieved. */
+                AssertMsgFailedReturn(("bOpcode=%#x\n", bOpcode), VERR_DWARF_TODO);
+            default:
+                AssertMsgFailedReturn(("bOpcode=%#x\n", bOpcode), VERR_DWARF_UNKNOWN_LOC_OPCODE);
+        }
+    }
+
+    return pLoc->Cursor.rc;
+}
+
+
+/** @callback_method_impl{FNRTDWARFATTRDECODER} */
+static DECLCALLBACK(int) rtDwarfDecode_SegmentLoc(PRTDWARFDIE pDie, uint8_t *pbMember, PCRTDWARFATTRDESC pDesc,
+                                                  uint32_t uForm, PRTDWARFCURSOR pCursor)
+{
+    NOREF(pDie);
+    AssertReturn(ATTR_GET_SIZE(pDesc) == 2, VERR_DWARF_IPE);
+
+    int rc;
+    if (   uForm == DW_FORM_block
+        || uForm == DW_FORM_block1
+        || uForm == DW_FORM_block2
+        || uForm == DW_FORM_block4)
+    {
+        RTDWARFLOCST LocSt;
+        rc = rtDwarfLoc_Init(&LocSt, pCursor, uForm);
+        if (RT_SUCCESS(rc))
+        {
+            rc = rtDwarfLoc_Evaluate(&LocSt, NULL, NULL);
+            if (RT_SUCCESS(rc))
+            {
+                if (LocSt.iTop >= 0)
+                {
+                    *(uint16_t *)pbMember = LocSt.auStack[LocSt.iTop];
+                    Log4(("          %-20s  %#06llx  [%s]\n", rtDwarfLog_AttrName(pDesc->uAttr),
+                          LocSt.auStack[LocSt.iTop],  rtDwarfLog_FormName(uForm)));
+                    return VINF_SUCCESS;
+                }
+                rc = VERR_DWARF_STACK_UNDERFLOW;
+            }
+        }
+    }
+    else
+        rc = rtDwarfDecode_UnsignedInt(pDie, pbMember, pDesc, uForm, pCursor);
+    return rc;
+}
+
+/*
+ *
+ * DWARF debug_info parser
+ * DWARF debug_info parser
+ * DWARF debug_info parser
+ *
+ */
+
+
+/**
+ * Special hack to get the name and/or linkage name for a subprogram via a
+ * specification reference.
+ *
+ * Since this is a hack, we ignore failure.
+ *
+ * If we want to really make use of DWARF info, we'll have to create some kind
+ * of lookup tree for handling this. But currently we don't, so a hack will
+ * suffice.
+ *
+ * @param   pThis               The DWARF instance.
+ * @param   pSubProgram         The subprogram which is short on names.
+ */
+static void rtDwarfInfo_TryGetSubProgramNameFromSpecRef(PRTDBGMODDWARF pThis, PRTDWARFDIESUBPROGRAM pSubProgram)
+{
+    /*
+     * Must have a spec ref, and it must be in the info section.
+     */
+    if (pSubProgram->SpecRef.enmWrt != krtDwarfRef_InfoSection)
+        return;
+
+    /*
+     * Create a cursor for reading the info and then the abbrivation code
+     * starting the off the DIE.
+     */
+    RTDWARFCURSOR InfoCursor;
+    int rc = rtDwarfCursor_InitWithOffset(&InfoCursor, pThis, krtDbgModDwarfSect_info, pSubProgram->SpecRef.off);
+    if (RT_FAILURE(rc))
+        return;
+
+    uint32_t uAbbrCode = rtDwarfCursor_GetULeb128AsU32(&InfoCursor, UINT32_MAX);
+    if (uAbbrCode)
+    {
+        /* Only references to subprogram tags are interesting here. */
+        PCRTDWARFABBREV pAbbrev = rtDwarfAbbrev_Lookup(pThis, uAbbrCode);
+        if (   pAbbrev
+            && pAbbrev->uTag == DW_TAG_subprogram)
+        {
+            /*
+             * Use rtDwarfInfo_ParseDie to do the parsing, but with a different
+             * attribute spec than usual.
+             */
+            rtDwarfInfo_ParseDie(pThis, &pSubProgram->Core, &g_SubProgramSpecHackDesc, &InfoCursor,
+                                 pAbbrev, false /*fInitDie*/);
+        }
+    }
+
+    rtDwarfCursor_Delete(&InfoCursor, VINF_SUCCESS);
+}
+
+
+/**
+ * Select which name to use.
+ *
+ * @returns One of the names.
+ * @param   pszName             The DWARF name, may exclude namespace and class.
+ *                              Can also be NULL.
+ * @param   pszLinkageName      The linkage name. Can be NULL.
+ */
+static const char *rtDwarfInfo_SelectName(const char *pszName,  const char *pszLinkageName)
+{
+    if (!pszName || !pszLinkageName)
+        return pszName ? pszName : pszLinkageName;
+
+    /*
+     * Some heuristics for selecting the link name if the normal name is missing
+     * namespace or class prefixes.
+     */
+    size_t cchName = strlen(pszName);
+    size_t cchLinkageName = strlen(pszLinkageName);
+    if (cchLinkageName <= cchName + 1)
+        return pszName;
+
+    const char *psz = strstr(pszLinkageName, pszName);
+    if (!psz || psz - pszLinkageName < 4)
+        return pszName;
+
+    return pszLinkageName;
+}
+
+
+/**
+ * Parse the attributes of a DIE.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ * @param   pDie                The internal DIE structure to fill.
+ */
+static int rtDwarfInfo_SnoopSymbols(PRTDBGMODDWARF pThis, PRTDWARFDIE pDie)
+{
+    int rc = VINF_SUCCESS;
+    switch (pDie->uTag)
+    {
+        case DW_TAG_subprogram:
+        {
+            PRTDWARFDIESUBPROGRAM pSubProgram = (PRTDWARFDIESUBPROGRAM)pDie;
+
+            /* Obtain referenced specification there is only partial info. */
+            if (   pSubProgram->PcRange.cAttrs
+                && !pSubProgram->pszName)
+                rtDwarfInfo_TryGetSubProgramNameFromSpecRef(pThis, pSubProgram);
+
+            if (pSubProgram->PcRange.cAttrs)
+            {
+                if (pSubProgram->PcRange.fHaveRanges)
+                    Log5(("subprogram %s (%s) <implement ranges>\n", pSubProgram->pszName, pSubProgram->pszLinkageName));
+                else
+                {
+                    Log5(("subprogram %s (%s) %#llx-%#llx%s\n", pSubProgram->pszName, pSubProgram->pszLinkageName,
+                          pSubProgram->PcRange.uLowAddress, pSubProgram->PcRange.uHighAddress,
+                          pSubProgram->PcRange.cAttrs == 2 ? "" : " !bad!"));
+                    if (   ( pSubProgram->pszName || pSubProgram->pszLinkageName)
+                        && pSubProgram->PcRange.cAttrs == 2)
+                    {
+                        if (pThis->iWatcomPass == 1)
+                            rc = rtDbgModDwarfRecordSegOffset(pThis, pSubProgram->uSegment, pSubProgram->PcRange.uHighAddress);
+                        else
+                        {
+                            RTDBGSEGIDX iSeg;
+                            RTUINTPTR   offSeg;
+                            rc = rtDbgModDwarfLinkAddressToSegOffset(pThis, pSubProgram->uSegment,
+                                                                     pSubProgram->PcRange.uLowAddress,
+                                                                     &iSeg, &offSeg);
+                            if (RT_SUCCESS(rc))
+                            {
+                                uint64_t cb;
+                                if (pSubProgram->PcRange.uHighAddress >= pSubProgram->PcRange.uLowAddress)
+                                    cb = pSubProgram->PcRange.uHighAddress - pSubProgram->PcRange.uLowAddress;
+                               else
+                                    cb = 1;
+                                rc = RTDbgModSymbolAdd(pThis->hCnt,
+                                                       rtDwarfInfo_SelectName(pSubProgram->pszName, pSubProgram->pszLinkageName),
+                                                       iSeg, offSeg, cb, 0 /*fFlags*/, NULL /*piOrdinal*/);
+                                if (RT_FAILURE(rc))
+                                {
+                                    if (   rc == VERR_DBG_DUPLICATE_SYMBOL
+                                        || rc == VERR_DBG_ADDRESS_CONFLICT /** @todo figure why this happens with 10.6.8 mach_kernel, 32-bit. */
+                                        )
+                                        rc = VINF_SUCCESS;
+                                    else
+                                        AssertMsgFailed(("%Rrc\n", rc));
+                                }
+                            }
+                            else if (   pSubProgram->PcRange.uLowAddress  == 0 /* see with vmlinux */
+                                     && pSubProgram->PcRange.uHighAddress == 0)
+                            {
+                                Log5(("rtDbgModDwarfLinkAddressToSegOffset: Ignoring empty range.\n"));
+                                rc = VINF_SUCCESS; /* ignore */
+                            }
+                            else
+                            {
+                                AssertRC(rc);
+                                Log5(("rtDbgModDwarfLinkAddressToSegOffset failed: %Rrc\n", rc));
+                            }
+                        }
+                    }
+                }
+            }
+            else
+                Log5(("subprogram %s (%s) external\n", pSubProgram->pszName, pSubProgram->pszLinkageName));
+            break;
+        }
+
+        case DW_TAG_label:
+        {
+            PCRTDWARFDIELABEL pLabel = (PCRTDWARFDIELABEL)pDie;
+            //if (pLabel->fExternal)
+            {
+                Log5(("label %s %#x:%#llx\n", pLabel->pszName, pLabel->uSegment, pLabel->Address.uAddress));
+                if (pThis->iWatcomPass == 1)
+                    rc = rtDbgModDwarfRecordSegOffset(pThis, pLabel->uSegment, pLabel->Address.uAddress);
+                else
+                {
+                    RTDBGSEGIDX iSeg;
+                    RTUINTPTR   offSeg;
+                    rc = rtDbgModDwarfLinkAddressToSegOffset(pThis, pLabel->uSegment, pLabel->Address.uAddress,
+                                                             &iSeg, &offSeg);
+                    AssertRC(rc);
+                    if (RT_SUCCESS(rc))
+                    {
+                        rc = RTDbgModSymbolAdd(pThis->hCnt, pLabel->pszName, iSeg, offSeg, 0 /*cb*/,
+                                               0 /*fFlags*/, NULL /*piOrdinal*/);
+                        AssertMsg(RT_SUCCESS(rc) || rc == VERR_DBG_ADDRESS_CONFLICT,
+                                  ("%Rrc %s %x:%x\n", rc, pLabel->pszName, iSeg, offSeg));
+                    }
+                    else
+                        Log5(("rtDbgModDwarfLinkAddressToSegOffset failed: %Rrc\n", rc));
+
+                    /* Ignore errors regarding local labels. */
+                    if (RT_FAILURE(rc) && !pLabel->fExternal)
+                        rc = -rc;
+                }
+
+            }
+            break;
+        }
+
+    }
+    return rc;
+}
+
+
+/**
+ * Initializes the non-core fields of an internal  DIE structure.
+ *
+ * @param   pDie                The DIE structure.
+ * @param   pDieDesc            The DIE descriptor.
+ */
+static void rtDwarfInfo_InitDie(PRTDWARFDIE pDie, PCRTDWARFDIEDESC pDieDesc)
+{
+    size_t i = pDieDesc->cAttributes;
+    while (i-- > 0)
+    {
+        switch (pDieDesc->paAttributes[i].cbInit & ATTR_INIT_MASK)
+        {
+            case ATTR_INIT_ZERO:
+                /* Nothing to do (RTMemAllocZ). */
+                break;
+
+            case ATTR_INIT_FFFS:
+                switch (pDieDesc->paAttributes[i].cbInit & ATTR_SIZE_MASK)
+                {
+                    case 1:
+                        *(uint8_t *)((uintptr_t)pDie + pDieDesc->paAttributes[i].off)  = UINT8_MAX;
+                        break;
+                    case 2:
+                        *(uint16_t *)((uintptr_t)pDie + pDieDesc->paAttributes[i].off) = UINT16_MAX;
+                        break;
+                    case 4:
+                        *(uint32_t *)((uintptr_t)pDie + pDieDesc->paAttributes[i].off) = UINT32_MAX;
+                        break;
+                    case 8:
+                        *(uint64_t *)((uintptr_t)pDie + pDieDesc->paAttributes[i].off) = UINT64_MAX;
+                        break;
+                    default:
+                        AssertFailed();
+                        memset((uint8_t *)pDie + pDieDesc->paAttributes[i].off, 0xff,
+                               pDieDesc->paAttributes[i].cbInit & ATTR_SIZE_MASK);
+                        break;
+                }
+                break;
+
+            default:
+                AssertFailed();
+        }
+    }
+}
+
+
+/**
+ * Creates a new internal DIE structure and links it up.
+ *
+ * @returns Pointer to the new DIE structure.
+ * @param   pThis               The DWARF instance.
+ * @param   pDieDesc            The DIE descriptor (for size and init).
+ * @param   pAbbrev             The abbreviation cache entry.
+ * @param   pParent             The parent DIE (NULL if unit).
+ */
+static PRTDWARFDIE rtDwarfInfo_NewDie(PRTDBGMODDWARF pThis, PCRTDWARFDIEDESC pDieDesc,
+                                      PCRTDWARFABBREV pAbbrev, PRTDWARFDIE pParent)
+{
+    NOREF(pThis);
+    Assert(pDieDesc->cbDie >= sizeof(RTDWARFDIE));
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+    uint32_t iAllocator = pDieDesc->cbDie > pThis->aDieAllocators[0].cbMax;
+    Assert(pDieDesc->cbDie <= pThis->aDieAllocators[iAllocator].cbMax);
+    PRTDWARFDIE pDie = (PRTDWARFDIE)RTMemCacheAlloc(pThis->aDieAllocators[iAllocator].hMemCache);
+#else
+    PRTDWARFDIE pDie = (PRTDWARFDIE)RTMemAllocZ(pDieDesc->cbDie);
+#endif
+    if (pDie)
+    {
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+        RT_BZERO(pDie, pDieDesc->cbDie);
+        pDie->iAllocator   = iAllocator;
+#endif
+        rtDwarfInfo_InitDie(pDie, pDieDesc);
+
+        pDie->uTag         = pAbbrev->uTag;
+        pDie->offSpec      = pAbbrev->offSpec;
+        pDie->pParent      = pParent;
+        if (pParent)
+            RTListAppend(&pParent->ChildList, &pDie->SiblingNode);
+        else
+            RTListInit(&pDie->SiblingNode);
+        RTListInit(&pDie->ChildList);
+
+    }
+    return pDie;
+}
+
+
+/**
+ * Free all children of a DIE.
+ *
+ * @param   pThis               The DWARF instance.
+ * @param   pParentDie          The parent DIE.
+ */
+static void rtDwarfInfo_FreeChildren(PRTDBGMODDWARF pThis, PRTDWARFDIE pParentDie)
+{
+    PRTDWARFDIE pChild, pNextChild;
+    RTListForEachSafe(&pParentDie->ChildList, pChild, pNextChild, RTDWARFDIE, SiblingNode)
+    {
+        if (!RTListIsEmpty(&pChild->ChildList))
+            rtDwarfInfo_FreeChildren(pThis, pChild);
+        RTListNodeRemove(&pChild->SiblingNode);
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+        RTMemCacheFree(pThis->aDieAllocators[pChild->iAllocator].hMemCache, pChild);
+#else
+        RTMemFree(pChild);
+#endif
+    }
+}
+
+
+/**
+ * Free a DIE an all its children.
+ *
+ * @param   pThis               The DWARF instance.
+ * @param   pDie                The DIE to free.
+ */
+static void rtDwarfInfo_FreeDie(PRTDBGMODDWARF pThis, PRTDWARFDIE pDie)
+{
+    rtDwarfInfo_FreeChildren(pThis, pDie);
+    RTListNodeRemove(&pDie->SiblingNode);
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+    RTMemCacheFree(pThis->aDieAllocators[pDie->iAllocator].hMemCache, pDie);
+#else
+    RTMemFree(pChild);
+#endif
+}
+
+
+/**
+ * Skips a form.
+ * @returns IPRT status code
+ * @param   pCursor             The cursor.
+ * @param   uForm               The form to skip.
+ */
+static int rtDwarfInfo_SkipForm(PRTDWARFCURSOR pCursor, uint32_t uForm)
+{
+    switch (uForm)
+    {
+        case DW_FORM_addr:
+            return rtDwarfCursor_SkipBytes(pCursor, pCursor->cbNativeAddr);
+
+        case DW_FORM_block:
+        case DW_FORM_exprloc:
+            return rtDwarfCursor_SkipBytes(pCursor, rtDwarfCursor_GetULeb128(pCursor, 0));
+
+        case DW_FORM_block1:
+            return rtDwarfCursor_SkipBytes(pCursor, rtDwarfCursor_GetU8(pCursor, 0));
+
+        case DW_FORM_block2:
+            return rtDwarfCursor_SkipBytes(pCursor, rtDwarfCursor_GetU16(pCursor, 0));
+
+        case DW_FORM_block4:
+            return rtDwarfCursor_SkipBytes(pCursor, rtDwarfCursor_GetU32(pCursor, 0));
+
+        case DW_FORM_data1:
+        case DW_FORM_ref1:
+        case DW_FORM_flag:
+            return rtDwarfCursor_SkipBytes(pCursor, 1);
+
+        case DW_FORM_data2:
+        case DW_FORM_ref2:
+            return rtDwarfCursor_SkipBytes(pCursor, 2);
+
+        case DW_FORM_data4:
+        case DW_FORM_ref4:
+            return rtDwarfCursor_SkipBytes(pCursor, 4);
+
+        case DW_FORM_data8:
+        case DW_FORM_ref8:
+        case DW_FORM_ref_sig8:
+            return rtDwarfCursor_SkipBytes(pCursor, 8);
+
+        case DW_FORM_udata:
+        case DW_FORM_sdata:
+        case DW_FORM_ref_udata:
+            return rtDwarfCursor_SkipLeb128(pCursor);
+
+        case DW_FORM_string:
+            rtDwarfCursor_GetSZ(pCursor, NULL);
+            return pCursor->rc;
+
+        case DW_FORM_indirect:
+            return rtDwarfInfo_SkipForm(pCursor, rtDwarfCursor_GetULeb128AsU32(pCursor, UINT32_MAX));
+
+        case DW_FORM_strp:
+        case DW_FORM_ref_addr:
+        case DW_FORM_sec_offset:
+            return rtDwarfCursor_SkipBytes(pCursor, pCursor->f64bitDwarf ? 8 : 4);
+
+        case DW_FORM_flag_present:
+            return pCursor->rc; /* no data */
+
+        default:
+            Log(("rtDwarfInfo_SkipForm: Unknown form %#x\n", uForm));
+            return VERR_DWARF_UNKNOWN_FORM;
+    }
+}
+
+
+
+#ifdef SOME_UNUSED_FUNCTION
+/**
+ * Skips a DIE.
+ *
+ * @returns IPRT status code.
+ * @param   pCursor         The cursor.
+ * @param   pAbbrevCursor   The abbreviation cursor.
+ */
+static int rtDwarfInfo_SkipDie(PRTDWARFCURSOR pCursor, PRTDWARFCURSOR pAbbrevCursor)
+{
+    for (;;)
+    {
+        uint32_t uAttr = rtDwarfCursor_GetULeb128AsU32(pAbbrevCursor, 0);
+        uint32_t uForm = rtDwarfCursor_GetULeb128AsU32(pAbbrevCursor, 0);
+        if (uAttr == 0 && uForm == 0)
+            break;
+
+        int rc = rtDwarfInfo_SkipForm(pCursor, uForm);
+        if (RT_FAILURE(rc))
+            return rc;
+    }
+    return RT_FAILURE(pCursor->rc) ? pCursor->rc : pAbbrevCursor->rc;
+}
+#endif
+
+
+/**
+ * Parse the attributes of a DIE.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ * @param   pDie                The internal DIE structure to fill.
+ * @param   pDieDesc            The DIE descriptor.
+ * @param   pCursor             The debug_info cursor.
+ * @param   pAbbrev             The abbreviation cache entry.
+ * @param   fInitDie            Whether to initialize the DIE first.  If not (@c
+ *                              false) it's safe to assume we're following a
+ *                              DW_AT_specification or DW_AT_abstract_origin,
+ *                              and that we shouldn't be snooping any symbols.
+ */
+static int rtDwarfInfo_ParseDie(PRTDBGMODDWARF pThis, PRTDWARFDIE pDie, PCRTDWARFDIEDESC pDieDesc,
+                                PRTDWARFCURSOR pCursor, PCRTDWARFABBREV pAbbrev, bool fInitDie)
+{
+    RTDWARFCURSOR AbbrevCursor;
+    int rc = rtDwarfCursor_InitWithOffset(&AbbrevCursor, pThis, krtDbgModDwarfSect_abbrev, pAbbrev->offSpec);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    if (fInitDie)
+        rtDwarfInfo_InitDie(pDie, pDieDesc);
+    for (;;)
+    {
+#ifdef LOG_ENABLED
+        uint32_t const off = (uint32_t)(AbbrevCursor.pb - AbbrevCursor.pbStart);
+#endif
+        uint32_t uAttr = rtDwarfCursor_GetULeb128AsU32(&AbbrevCursor, 0);
+        uint32_t uForm = rtDwarfCursor_GetULeb128AsU32(&AbbrevCursor, 0);
+        Log4(("    %04x: %-23s [%s]\n", off, rtDwarfLog_AttrName(uAttr), rtDwarfLog_FormName(uForm)));
+        if (uAttr == 0)
+            break;
+        if (uForm == DW_FORM_indirect)
+            uForm = rtDwarfCursor_GetULeb128AsU32(pCursor, 0);
+
+        /* Look up the attribute in the descriptor and invoke the decoder. */
+        PCRTDWARFATTRDESC pAttr = NULL;
+        size_t i = pDieDesc->cAttributes;
+        while (i-- > 0)
+            if (pDieDesc->paAttributes[i].uAttr == uAttr)
+            {
+                pAttr = &pDieDesc->paAttributes[i];
+                rc = pAttr->pfnDecoder(pDie, (uint8_t *)pDie + pAttr->off, pAttr, uForm, pCursor);
+                break;
+            }
+
+        /* Some house keeping. */
+        if (pAttr)
+            pDie->cDecodedAttrs++;
+        else
+        {
+            pDie->cUnhandledAttrs++;
+            rc = rtDwarfInfo_SkipForm(pCursor, uForm);
+        }
+        if (RT_FAILURE(rc))
+            break;
+    }
+
+    rc = rtDwarfCursor_Delete(&AbbrevCursor, rc);
+    if (RT_SUCCESS(rc))
+        rc = pCursor->rc;
+
+    /*
+     * Snoop up symbols on the way out.
+     */
+    if (RT_SUCCESS(rc) && fInitDie)
+    {
+        rc = rtDwarfInfo_SnoopSymbols(pThis, pDie);
+        /* Ignore duplicates, get work done instead. */
+        /** @todo clean up global/static symbol mess. */
+        if (rc == VERR_DBG_DUPLICATE_SYMBOL || rc == VERR_DBG_ADDRESS_CONFLICT)
+            rc = VINF_SUCCESS;
+    }
+
+    return rc;
+}
+
+
+/**
+ * Load the debug information of a unit.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The DWARF instance.
+ * @param   pCursor             The debug_info cursor.
+ * @param   fKeepDies           Whether to keep the DIEs or discard them as soon
+ *                              as possible.
+ */
+static int rtDwarfInfo_LoadUnit(PRTDBGMODDWARF pThis, PRTDWARFCURSOR pCursor, bool fKeepDies)
+{
+    Log(("rtDwarfInfo_LoadUnit: %#x\n", rtDwarfCursor_CalcSectOffsetU32(pCursor)));
+
+    /*
+     * Read the compilation unit header.
+     */
+    uint64_t offUnit = rtDwarfCursor_CalcSectOffsetU32(pCursor);
+    uint64_t cbUnit  = rtDwarfCursor_GetInitialLength(pCursor);
+    cbUnit += rtDwarfCursor_CalcSectOffsetU32(pCursor) - offUnit;
+    uint16_t const uVer = rtDwarfCursor_GetUHalf(pCursor, 0);
+    if (   uVer < 2
+        || uVer > 4)
+        return rtDwarfCursor_SkipUnit(pCursor);
+    uint64_t const offAbbrev    = rtDwarfCursor_GetUOff(pCursor, UINT64_MAX);
+    uint8_t  const cbNativeAddr = rtDwarfCursor_GetU8(pCursor, UINT8_MAX);
+    if (RT_FAILURE(pCursor->rc))
+        return pCursor->rc;
+    Log(("   uVer=%d  offAbbrev=%#llx cbNativeAddr=%d\n", uVer, offAbbrev, cbNativeAddr));
+
+    /*
+     * Set up the abbreviation cache and store the native address size in the cursor.
+     */
+    if (offAbbrev > UINT32_MAX)
+    {
+        Log(("Unexpected abbrviation code offset of %#llx\n", offAbbrev));
+        return VERR_DWARF_BAD_INFO;
+    }
+    rtDwarfAbbrev_SetUnitOffset(pThis, (uint32_t)offAbbrev);
+    pCursor->cbNativeAddr = cbNativeAddr;
+
+    /*
+     * The first DIE is a compile or partial unit, parse it here.
+     */
+    uint32_t uAbbrCode = rtDwarfCursor_GetULeb128AsU32(pCursor, UINT32_MAX);
+    if (!uAbbrCode)
+    {
+        Log(("Unexpected abbrviation code of zero\n"));
+        return VERR_DWARF_BAD_INFO;
+    }
+    PCRTDWARFABBREV pAbbrev = rtDwarfAbbrev_Lookup(pThis, uAbbrCode);
+    if (!pAbbrev)
+        return VERR_DWARF_ABBREV_NOT_FOUND;
+    if (   pAbbrev->uTag != DW_TAG_compile_unit
+        && pAbbrev->uTag != DW_TAG_partial_unit)
+    {
+        Log(("Unexpected compile/partial unit tag %#x\n", pAbbrev->uTag));
+        return VERR_DWARF_BAD_INFO;
+    }
+
+    PRTDWARFDIECOMPILEUNIT pUnit;
+    pUnit = (PRTDWARFDIECOMPILEUNIT)rtDwarfInfo_NewDie(pThis, &g_CompileUnitDesc, pAbbrev, NULL /*pParent*/);
+    if (!pUnit)
+        return VERR_NO_MEMORY;
+    pUnit->offUnit      = offUnit;
+    pUnit->cbUnit       = cbUnit;
+    pUnit->offAbbrev    = offAbbrev;
+    pUnit->cbNativeAddr = cbNativeAddr;
+    pUnit->uDwarfVer    = (uint8_t)uVer;
+    RTListAppend(&pThis->CompileUnitList, &pUnit->Core.SiblingNode);
+
+    int rc = rtDwarfInfo_ParseDie(pThis, &pUnit->Core, &g_CompileUnitDesc, pCursor, pAbbrev, true /*fInitDie*/);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * Parse DIEs.
+     */
+    uint32_t    cDepth     = 0;
+    PRTDWARFDIE pParentDie = &pUnit->Core;
+    while (!rtDwarfCursor_IsAtEndOfUnit(pCursor))
+    {
+#ifdef LOG_ENABLED
+        uint32_t offLog = rtDwarfCursor_CalcSectOffsetU32(pCursor);
+#endif
+        uAbbrCode = rtDwarfCursor_GetULeb128AsU32(pCursor, UINT32_MAX);
+        if (!uAbbrCode)
+        {
+            /* End of siblings, up one level. (Is this correct?) */
+            if (pParentDie->pParent)
+            {
+                pParentDie = pParentDie->pParent;
+                cDepth--;
+                if (!fKeepDies && pParentDie->pParent)
+                    rtDwarfInfo_FreeChildren(pThis, pParentDie);
+            }
+        }
+        else
+        {
+            /*
+             * Look up the abbreviation and match the tag up with a descriptor.
+             */
+            pAbbrev = rtDwarfAbbrev_Lookup(pThis, uAbbrCode);
+            if (!pAbbrev)
+                return VERR_DWARF_ABBREV_NOT_FOUND;
+
+            PCRTDWARFDIEDESC pDieDesc;
+            const char      *pszName;
+            if (pAbbrev->uTag < RT_ELEMENTS(g_aTagDescs))
+            {
+                Assert(g_aTagDescs[pAbbrev->uTag].uTag == pAbbrev->uTag || g_aTagDescs[pAbbrev->uTag].uTag == 0);
+                pszName  = g_aTagDescs[pAbbrev->uTag].pszName;
+                pDieDesc = g_aTagDescs[pAbbrev->uTag].pDesc;
+            }
+            else
+            {
+                pszName  = "<unknown>";
+                pDieDesc = &g_CoreDieDesc;
+            }
+            Log4(("%08x: %*stag=%s (%#x, abbrev %u @ %#x)%s\n", offLog, cDepth * 2, "", pszName,
+                  pAbbrev->uTag, uAbbrCode, pAbbrev->offSpec - pAbbrev->cbHdr, pAbbrev->fChildren ? " has children" : ""));
+
+            /*
+             * Create a new internal DIE structure and parse the
+             * attributes.
+             */
+            PRTDWARFDIE pNewDie = rtDwarfInfo_NewDie(pThis, pDieDesc, pAbbrev, pParentDie);
+            if (!pNewDie)
+                return VERR_NO_MEMORY;
+
+            if (pAbbrev->fChildren)
+            {
+                pParentDie = pNewDie;
+                cDepth++;
+            }
+
+            rc = rtDwarfInfo_ParseDie(pThis, pNewDie, pDieDesc, pCursor, pAbbrev, true /*fInitDie*/);
+            if (RT_FAILURE(rc))
+                return rc;
+
+            if (!fKeepDies && !pAbbrev->fChildren)
+                rtDwarfInfo_FreeDie(pThis, pNewDie);
+        }
+    } /* while more DIEs */
+
+
+    /* Unlink and free child DIEs if told to do so. */
+    if (!fKeepDies)
+        rtDwarfInfo_FreeChildren(pThis, &pUnit->Core);
+
+    return RT_SUCCESS(rc) ? pCursor->rc : rc;
+}
+
+
+/**
+ * Extracts the symbols.
+ *
+ * The symbols are insered into the debug info container.
+ *
+ * @returns IPRT status code
+ * @param   pThis               The DWARF instance.
+ */
+static int rtDwarfInfo_LoadAll(PRTDBGMODDWARF pThis)
+{
+    RTDWARFCURSOR Cursor;
+    int rc = rtDwarfCursor_Init(&Cursor, pThis, krtDbgModDwarfSect_info);
+    if (RT_SUCCESS(rc))
+    {
+        while (   !rtDwarfCursor_IsAtEnd(&Cursor)
+               && RT_SUCCESS(rc))
+            rc = rtDwarfInfo_LoadUnit(pThis, &Cursor, false /* fKeepDies */);
+
+        rc = rtDwarfCursor_Delete(&Cursor, rc);
+    }
+    return rc;
+}
+
+
+
+/*
+ *
+ * Public and image level symbol handling.
+ * Public and image level symbol handling.
+ * Public and image level symbol handling.
+ * Public and image level symbol handling.
+ *
+ *
+ */
+
+#define RTDBGDWARF_SYM_ENUM_BASE_ADDRESS  UINT32_C(0x200000)
+
+/** @callback_method_impl{FNRTLDRENUMSYMS,
+ *  Adds missing symbols from the image symbol table.} */
+static DECLCALLBACK(int) rtDwarfSyms_EnumSymbolsCallback(RTLDRMOD hLdrMod, const char *pszSymbol, unsigned uSymbol,
+                                                         RTLDRADDR Value, void *pvUser)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pvUser;
+    RT_NOREF_PV(hLdrMod); RT_NOREF_PV(uSymbol);
+    Assert(pThis->iWatcomPass != 1);
+
+    RTLDRADDR uRva = Value - RTDBGDWARF_SYM_ENUM_BASE_ADDRESS;
+    if (   Value >= RTDBGDWARF_SYM_ENUM_BASE_ADDRESS
+        && uRva  <  _1G)
+    {
+        RTDBGSYMBOL SymInfo;
+        RTINTPTR    offDisp;
+        int rc = RTDbgModSymbolByAddr(pThis->hCnt, RTDBGSEGIDX_RVA, uRva, RTDBGSYMADDR_FLAGS_LESS_OR_EQUAL, &offDisp, &SymInfo);
+        if (   RT_FAILURE(rc)
+            || offDisp != 0)
+        {
+            rc = RTDbgModSymbolAdd(pThis->hCnt, pszSymbol, RTDBGSEGIDX_RVA, uRva, 1, 0 /*fFlags*/, NULL /*piOrdinal*/);
+            Log(("Dwarf: Symbol #%05u %#018RTptr %s [%Rrc]\n", uSymbol, Value, pszSymbol, rc)); NOREF(rc);
+        }
+    }
+    else
+        Log(("Dwarf: Symbol #%05u %#018RTptr '%s' [SKIPPED - INVALID ADDRESS]\n", uSymbol, Value, pszSymbol));
+    return VINF_SUCCESS;
+}
+
+
+
+/**
+ * Loads additional symbols from the pubnames section and the executable image.
+ *
+ * The symbols are insered into the debug info container.
+ *
+ * @returns IPRT status code
+ * @param   pThis               The DWARF instance.
+ */
+static int rtDwarfSyms_LoadAll(PRTDBGMODDWARF pThis)
+{
+    /*
+     * pubnames.
+     */
+    int rc = VINF_SUCCESS;
+    if (pThis->aSections[krtDbgModDwarfSect_pubnames].fPresent)
+    {
+//        RTDWARFCURSOR Cursor;
+//        int rc = rtDwarfCursor_Init(&Cursor, pThis, krtDbgModDwarfSect_info);
+//        if (RT_SUCCESS(rc))
+//        {
+//            while (   !rtDwarfCursor_IsAtEnd(&Cursor)
+//                   && RT_SUCCESS(rc))
+//                rc = rtDwarfInfo_LoadUnit(pThis, &Cursor, false /* fKeepDies */);
+//
+//            rc = rtDwarfCursor_Delete(&Cursor, rc);
+//        }
+//        return rc;
+    }
+
+    /*
+     * The executable image.
+     */
+    if (   pThis->pImgMod
+        && pThis->pImgMod->pImgVt->pfnEnumSymbols
+        && pThis->iWatcomPass != 1
+        && RT_SUCCESS(rc))
+    {
+        rc = pThis->pImgMod->pImgVt->pfnEnumSymbols(pThis->pImgMod,
+                                                    RTLDR_ENUM_SYMBOL_FLAGS_ALL | RTLDR_ENUM_SYMBOL_FLAGS_NO_FWD,
+                                                    RTDBGDWARF_SYM_ENUM_BASE_ADDRESS,
+                                                    rtDwarfSyms_EnumSymbolsCallback,
+                                                    pThis);
+    }
+
+    return rc;
+}
+
+
+
+
+/*
+ *
+ * DWARF Debug module implementation.
+ * DWARF Debug module implementation.
+ * DWARF Debug module implementation.
+ *
+ */
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnUnwindFrame} */
+static DECLCALLBACK(int) rtDbgModDwarf_UnwindFrame(PRTDBGMODINT pMod, RTDBGSEGIDX iSeg, RTUINTPTR off, PRTDBGUNWINDSTATE pState)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+
+    /*
+     * Unwinding info is stored in the '.debug_frame' section, or altertively
+     * in the '.eh_frame' one in the image.  In the latter case the dbgmodldr.cpp
+     * part of the operation will take care of it.  Since the sections contain the
+     * same data, we just create a cursor and call a common function to do the job.
+     */
+    if (pThis->aSections[krtDbgModDwarfSect_frame].fPresent)
+    {
+        RTDWARFCURSOR Cursor;
+        int rc = rtDwarfCursor_Init(&Cursor, pThis, krtDbgModDwarfSect_frame);
+        if (RT_SUCCESS(rc))
+        {
+            /* Figure default pointer encoding from image arch. */
+            uint8_t bPtrEnc = rtDwarfUnwind_ArchToPtrEnc(pMod->pImgVt->pfnGetArch(pMod));
+
+            /* Make sure we've got both seg:off and rva for the input address. */
+            RTUINTPTR uRva = off;
+            if (iSeg == RTDBGSEGIDX_RVA)
+                rtDbgModDwarfRvaToSegOffset(pThis, uRva, &iSeg, &off);
+            else
+                rtDbgModDwarfSegOffsetToRva(pThis, iSeg, off, &uRva);
+
+            /* Do the work */
+            rc = rtDwarfUnwind_Slow(&Cursor, 0 /** @todo .debug_frame RVA*/, iSeg, off, uRva,
+                                    pState, bPtrEnc, false /*fIsEhFrame*/, pMod->pImgVt->pfnGetArch(pMod));
+
+            rc = rtDwarfCursor_Delete(&Cursor, rc);
+        }
+        return rc;
+    }
+    return VERR_DBG_NO_UNWIND_INFO;
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnLineByAddr} */
+static DECLCALLBACK(int) rtDbgModDwarf_LineByAddr(PRTDBGMODINT pMod, RTDBGSEGIDX iSeg, RTUINTPTR off,
+                                                  PRTINTPTR poffDisp, PRTDBGLINE pLineInfo)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModLineByAddr(pThis->hCnt, iSeg, off, poffDisp, pLineInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnLineByOrdinal} */
+static DECLCALLBACK(int) rtDbgModDwarf_LineByOrdinal(PRTDBGMODINT pMod, uint32_t iOrdinal, PRTDBGLINE pLineInfo)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModLineByOrdinal(pThis->hCnt, iOrdinal, pLineInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnLineCount} */
+static DECLCALLBACK(uint32_t) rtDbgModDwarf_LineCount(PRTDBGMODINT pMod)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModLineCount(pThis->hCnt);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnLineAdd} */
+static DECLCALLBACK(int) rtDbgModDwarf_LineAdd(PRTDBGMODINT pMod, const char *pszFile, size_t cchFile, uint32_t uLineNo,
+                                               uint32_t iSeg, RTUINTPTR off, uint32_t *piOrdinal)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    Assert(!pszFile[cchFile]); NOREF(cchFile);
+    return RTDbgModLineAdd(pThis->hCnt, pszFile, uLineNo, iSeg, off, piOrdinal);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolByAddr} */
+static DECLCALLBACK(int) rtDbgModDwarf_SymbolByAddr(PRTDBGMODINT pMod, RTDBGSEGIDX iSeg, RTUINTPTR off, uint32_t fFlags,
+                                                    PRTINTPTR poffDisp, PRTDBGSYMBOL pSymInfo)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModSymbolByAddr(pThis->hCnt, iSeg, off, fFlags, poffDisp, pSymInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolByName} */
+static DECLCALLBACK(int) rtDbgModDwarf_SymbolByName(PRTDBGMODINT pMod, const char *pszSymbol, size_t cchSymbol,
+                                                    PRTDBGSYMBOL pSymInfo)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    Assert(!pszSymbol[cchSymbol]); RT_NOREF_PV(cchSymbol);
+    return RTDbgModSymbolByName(pThis->hCnt, pszSymbol/*, cchSymbol*/, pSymInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolByOrdinal} */
+static DECLCALLBACK(int) rtDbgModDwarf_SymbolByOrdinal(PRTDBGMODINT pMod, uint32_t iOrdinal, PRTDBGSYMBOL pSymInfo)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModSymbolByOrdinal(pThis->hCnt, iOrdinal, pSymInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolCount} */
+static DECLCALLBACK(uint32_t) rtDbgModDwarf_SymbolCount(PRTDBGMODINT pMod)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModSymbolCount(pThis->hCnt);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolAdd} */
+static DECLCALLBACK(int) rtDbgModDwarf_SymbolAdd(PRTDBGMODINT pMod, const char *pszSymbol, size_t cchSymbol,
+                                                 RTDBGSEGIDX iSeg, RTUINTPTR off, RTUINTPTR cb, uint32_t fFlags,
+                                                 uint32_t *piOrdinal)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    Assert(!pszSymbol[cchSymbol]); NOREF(cchSymbol);
+    return RTDbgModSymbolAdd(pThis->hCnt, pszSymbol, iSeg, off, cb, fFlags, piOrdinal);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSegmentByIndex} */
+static DECLCALLBACK(int) rtDbgModDwarf_SegmentByIndex(PRTDBGMODINT pMod, RTDBGSEGIDX iSeg, PRTDBGSEGMENT pSegInfo)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModSegmentByIndex(pThis->hCnt, iSeg, pSegInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSegmentCount} */
+static DECLCALLBACK(RTDBGSEGIDX) rtDbgModDwarf_SegmentCount(PRTDBGMODINT pMod)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModSegmentCount(pThis->hCnt);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSegmentAdd} */
+static DECLCALLBACK(int) rtDbgModDwarf_SegmentAdd(PRTDBGMODINT pMod, RTUINTPTR uRva, RTUINTPTR cb, const char *pszName, size_t cchName,
+                                                  uint32_t fFlags, PRTDBGSEGIDX piSeg)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    Assert(!pszName[cchName]); NOREF(cchName);
+    return RTDbgModSegmentAdd(pThis->hCnt, uRva, cb, pszName, fFlags, piSeg);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnImageSize} */
+static DECLCALLBACK(RTUINTPTR) rtDbgModDwarf_ImageSize(PRTDBGMODINT pMod)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    RTUINTPTR cb1 = RTDbgModImageSize(pThis->hCnt);
+    RTUINTPTR cb2 = pThis->pImgMod->pImgVt->pfnImageSize(pMod);
+    return RT_MAX(cb1, cb2);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnRvaToSegOff} */
+static DECLCALLBACK(RTDBGSEGIDX) rtDbgModDwarf_RvaToSegOff(PRTDBGMODINT pMod, RTUINTPTR uRva, PRTUINTPTR poffSeg)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+    return RTDbgModRvaToSegOff(pThis->hCnt, uRva, poffSeg);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnClose} */
+static DECLCALLBACK(int) rtDbgModDwarf_Close(PRTDBGMODINT pMod)
+{
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pMod->pvDbgPriv;
+
+    for (unsigned iSect = 0; iSect < RT_ELEMENTS(pThis->aSections); iSect++)
+        if (pThis->aSections[iSect].pv)
+            pThis->pDbgInfoMod->pImgVt->pfnUnmapPart(pThis->pDbgInfoMod, pThis->aSections[iSect].cb, &pThis->aSections[iSect].pv);
+
+    RTDbgModRelease(pThis->hCnt);
+    RTMemFree(pThis->paCachedAbbrevs);
+    if (pThis->pNestedMod)
+    {
+        pThis->pNestedMod->pImgVt->pfnClose(pThis->pNestedMod);
+        RTStrCacheRelease(g_hDbgModStrCache, pThis->pNestedMod->pszName);
+        RTStrCacheRelease(g_hDbgModStrCache, pThis->pNestedMod->pszDbgFile);
+        RTMemFree(pThis->pNestedMod);
+        pThis->pNestedMod = NULL;
+    }
+
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+    uint32_t i = RT_ELEMENTS(pThis->aDieAllocators);
+    while (i-- > 0)
+    {
+        RTMemCacheDestroy(pThis->aDieAllocators[i].hMemCache);
+        pThis->aDieAllocators[i].hMemCache = NIL_RTMEMCACHE;
+    }
+#endif
+
+    RTMemFree(pThis);
+
+    return VINF_SUCCESS;
+}
+
+
+/** @callback_method_impl{FNRTLDRENUMDBG} */
+static DECLCALLBACK(int) rtDbgModDwarfEnumCallback(RTLDRMOD hLdrMod, PCRTLDRDBGINFO pDbgInfo, void *pvUser)
+{
+    RT_NOREF_PV(hLdrMod);
+
+    /*
+     * Skip stuff we can't handle.
+     */
+    if (pDbgInfo->enmType != RTLDRDBGINFOTYPE_DWARF)
+        return VINF_SUCCESS;
+    const char *pszSection = pDbgInfo->u.Dwarf.pszSection;
+    if (!pszSection || !*pszSection)
+        return VINF_SUCCESS;
+    Assert(!pDbgInfo->pszExtFile);
+
+    /*
+     * Must have a part name starting with debug_ and possibly prefixed by dots
+     * or underscores.
+     */
+    if (!strncmp(pszSection, RT_STR_TUPLE(".debug_")))       /* ELF */
+        pszSection += sizeof(".debug_") - 1;
+    else if (!strncmp(pszSection, RT_STR_TUPLE("__debug_"))) /* Mach-O */
+        pszSection += sizeof("__debug_") - 1;
+    else if (!strcmp(pszSection, ".WATCOM_references"))
+        return VINF_SUCCESS; /* Ignore special watcom section for now.*/
+    else if (   !strcmp(pszSection, "__apple_types")
+             || !strcmp(pszSection, "__apple_namespac")
+             || !strcmp(pszSection, "__apple_objc")
+             || !strcmp(pszSection, "__apple_names"))
+        return VINF_SUCCESS; /* Ignore special apple sections for now. */
+    else
+        AssertMsgFailedReturn(("%s\n", pszSection), VINF_SUCCESS /*ignore*/);
+
+    /*
+     * Figure out which part we're talking about.
+     */
+    krtDbgModDwarfSect enmSect;
+    if (0) { /* dummy */ }
+#define ELSE_IF_STRCMP_SET(a_Name) else if (!strcmp(pszSection, #a_Name))  enmSect = krtDbgModDwarfSect_ ## a_Name
+    ELSE_IF_STRCMP_SET(abbrev);
+    ELSE_IF_STRCMP_SET(aranges);
+    ELSE_IF_STRCMP_SET(frame);
+    ELSE_IF_STRCMP_SET(info);
+    ELSE_IF_STRCMP_SET(inlined);
+    ELSE_IF_STRCMP_SET(line);
+    ELSE_IF_STRCMP_SET(loc);
+    ELSE_IF_STRCMP_SET(macinfo);
+    ELSE_IF_STRCMP_SET(pubnames);
+    ELSE_IF_STRCMP_SET(pubtypes);
+    ELSE_IF_STRCMP_SET(ranges);
+    ELSE_IF_STRCMP_SET(str);
+    ELSE_IF_STRCMP_SET(types);
+#undef ELSE_IF_STRCMP_SET
+    else
+    {
+        AssertMsgFailed(("%s\n", pszSection));
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Record the section.
+     */
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)pvUser;
+    AssertMsgReturn(!pThis->aSections[enmSect].fPresent, ("duplicate %s\n", pszSection), VINF_SUCCESS /*ignore*/);
+
+    pThis->aSections[enmSect].fPresent  = true;
+    pThis->aSections[enmSect].offFile   = pDbgInfo->offFile;
+    pThis->aSections[enmSect].pv        = NULL;
+    pThis->aSections[enmSect].cb        = (size_t)pDbgInfo->cb;
+    pThis->aSections[enmSect].iDbgInfo  = pDbgInfo->iDbgInfo;
+    if (pThis->aSections[enmSect].cb != pDbgInfo->cb)
+        pThis->aSections[enmSect].cb    = ~(size_t)0;
+
+    return VINF_SUCCESS;
+}
+
+
+static int rtDbgModDwarfTryOpenDbgFile(PRTDBGMODINT pDbgMod, PRTDBGMODDWARF pThis, RTLDRARCH enmArch)
+{
+    if (   !pDbgMod->pszDbgFile
+        || RTPathIsSame(pDbgMod->pszDbgFile, pDbgMod->pszImgFile) == (int)true /* returns VERR too */)
+        return VERR_DBG_NO_MATCHING_INTERPRETER;
+
+    /*
+     * Only open the image.
+     */
+    PRTDBGMODINT pDbgInfoMod = (PRTDBGMODINT)RTMemAllocZ(sizeof(*pDbgInfoMod));
+    if (!pDbgInfoMod)
+        return VERR_NO_MEMORY;
+
+    int rc;
+    pDbgInfoMod->u32Magic     = RTDBGMOD_MAGIC;
+    pDbgInfoMod->cRefs        = 1;
+    if (RTStrCacheRetain(pDbgMod->pszDbgFile) != UINT32_MAX)
+    {
+        pDbgInfoMod->pszImgFile = pDbgMod->pszDbgFile;
+        if (RTStrCacheRetain(pDbgMod->pszName) != UINT32_MAX)
+        {
+            pDbgInfoMod->pszName = pDbgMod->pszName;
+            pDbgInfoMod->pImgVt  = &g_rtDbgModVtImgLdr;
+            rc = pDbgInfoMod->pImgVt->pfnTryOpen(pDbgInfoMod, enmArch);
+            if (RT_SUCCESS(rc))
+            {
+                pThis->pDbgInfoMod = pDbgInfoMod;
+                pThis->pNestedMod  = pDbgInfoMod;
+                return VINF_SUCCESS;
+            }
+
+            RTStrCacheRelease(g_hDbgModStrCache, pDbgInfoMod->pszName);
+        }
+        else
+            rc = VERR_NO_STR_MEMORY;
+        RTStrCacheRelease(g_hDbgModStrCache,  pDbgInfoMod->pszImgFile);
+    }
+    else
+        rc = VERR_NO_STR_MEMORY;
+    RTMemFree(pDbgInfoMod);
+    return rc;
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnTryOpen} */
+static DECLCALLBACK(int) rtDbgModDwarf_TryOpen(PRTDBGMODINT pMod, RTLDRARCH enmArch)
+{
+    /*
+     * DWARF is only supported when part of an image.
+     */
+    if (!pMod->pImgVt)
+        return VERR_DBG_NO_MATCHING_INTERPRETER;
+
+    /*
+     * Create the module instance data.
+     */
+    PRTDBGMODDWARF pThis = (PRTDBGMODDWARF)RTMemAllocZ(sizeof(*pThis));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+    pThis->pDbgInfoMod = pMod;
+    pThis->pImgMod     = pMod;
+    RTListInit(&pThis->CompileUnitList);
+
+    /** @todo better fUseLinkAddress heuristics! */
+    /* mach_kernel: */
+    if (   (pMod->pszDbgFile          && strstr(pMod->pszDbgFile,          "mach_kernel"))
+        || (pMod->pszImgFile          && strstr(pMod->pszImgFile,          "mach_kernel"))
+        || (pMod->pszImgFileSpecified && strstr(pMod->pszImgFileSpecified, "mach_kernel")) )
+        pThis->fUseLinkAddress = true;
+
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+    AssertCompile(RT_ELEMENTS(pThis->aDieAllocators) == 2);
+    pThis->aDieAllocators[0].cbMax = sizeof(RTDWARFDIE);
+    pThis->aDieAllocators[1].cbMax = sizeof(RTDWARFDIECOMPILEUNIT);
+    for (uint32_t i = 0; i < RT_ELEMENTS(g_aTagDescs); i++)
+        if (g_aTagDescs[i].pDesc && g_aTagDescs[i].pDesc->cbDie > pThis->aDieAllocators[1].cbMax)
+            pThis->aDieAllocators[1].cbMax = (uint32_t)g_aTagDescs[i].pDesc->cbDie;
+    pThis->aDieAllocators[1].cbMax = RT_ALIGN_32(pThis->aDieAllocators[1].cbMax, sizeof(uint64_t));
+
+    for (uint32_t i = 0; i < RT_ELEMENTS(pThis->aDieAllocators); i++)
+    {
+        int rc = RTMemCacheCreate(&pThis->aDieAllocators[i].hMemCache, pThis->aDieAllocators[i].cbMax, sizeof(uint64_t),
+                                  UINT32_MAX, NULL /*pfnCtor*/, NULL /*pfnDtor*/, NULL /*pvUser*/, 0 /*fFlags*/);
+        if (RT_FAILURE(rc))
+        {
+            while (i-- > 0)
+                RTMemCacheDestroy(pThis->aDieAllocators[i].hMemCache);
+            RTMemFree(pThis);
+            return rc;
+        }
+    }
+#endif
+
+    /*
+     * If the debug file name is set, let's see if it's an ELF image with DWARF
+     * inside it. In that case we'll have to deal with two image modules, one
+     * for segments and address translation and one for the debug information.
+     */
+    if (pMod->pszDbgFile != NULL)
+        rtDbgModDwarfTryOpenDbgFile(pMod, pThis, enmArch);
+
+    /*
+     * Enumerate the debug info in the module, looking for DWARF bits.
+     */
+    int rc = pThis->pDbgInfoMod->pImgVt->pfnEnumDbgInfo(pThis->pDbgInfoMod, rtDbgModDwarfEnumCallback, pThis);
+    if (RT_SUCCESS(rc))
+    {
+        if (pThis->aSections[krtDbgModDwarfSect_info].fPresent)
+        {
+            /*
+             * Extract / explode the data we want (symbols and line numbers)
+             * storing them in a container module.
+             */
+            rc = RTDbgModCreate(&pThis->hCnt, pMod->pszName, 0 /*cbSeg*/, 0 /*fFlags*/);
+            if (RT_SUCCESS(rc))
+            {
+                pMod->pvDbgPriv = pThis;
+
+                rc = rtDbgModDwarfAddSegmentsFromImage(pThis);
+                if (RT_SUCCESS(rc))
+                    rc = rtDwarfInfo_LoadAll(pThis);
+                if (RT_SUCCESS(rc))
+                    rc = rtDwarfSyms_LoadAll(pThis);
+                if (RT_SUCCESS(rc))
+                    rc = rtDwarfLine_ExplodeAll(pThis);
+                if (RT_SUCCESS(rc) && pThis->iWatcomPass == 1)
+                {
+                    rc = rtDbgModDwarfAddSegmentsFromPass1(pThis);
+                    pThis->iWatcomPass = 2;
+                    if (RT_SUCCESS(rc))
+                        rc = rtDwarfInfo_LoadAll(pThis);
+                    if (RT_SUCCESS(rc))
+                        rc = rtDwarfSyms_LoadAll(pThis);
+                    if (RT_SUCCESS(rc))
+                        rc = rtDwarfLine_ExplodeAll(pThis);
+                }
+                if (RT_SUCCESS(rc))
+                {
+                    /*
+                     * Free the cached abbreviations and unload all sections.
+                     */
+                    pThis->cCachedAbbrevsAlloced = 0;
+                    RTMemFree(pThis->paCachedAbbrevs);
+                    pThis->paCachedAbbrevs = NULL;
+
+                    for (unsigned iSect = 0; iSect < RT_ELEMENTS(pThis->aSections); iSect++)
+                        if (pThis->aSections[iSect].pv)
+                            pThis->pDbgInfoMod->pImgVt->pfnUnmapPart(pThis->pDbgInfoMod, pThis->aSections[iSect].cb,
+                                                                     &pThis->aSections[iSect].pv);
+
+                    /** @todo Kill pThis->CompileUnitList and the alloc caches. */
+                    return VINF_SUCCESS;
+                }
+
+                /* bail out. */
+                RTDbgModRelease(pThis->hCnt);
+                pMod->pvDbgPriv = NULL;
+            }
+        }
+        else
+            rc = VERR_DBG_NO_MATCHING_INTERPRETER;
+    }
+
+    RTMemFree(pThis->paCachedAbbrevs);
+
+#ifdef RTDBGMODDWARF_WITH_MEM_CACHE
+    uint32_t i = RT_ELEMENTS(pThis->aDieAllocators);
+    while (i-- > 0)
+    {
+        RTMemCacheDestroy(pThis->aDieAllocators[i].hMemCache);
+        pThis->aDieAllocators[i].hMemCache = NIL_RTMEMCACHE;
+    }
+#endif
+
+    RTMemFree(pThis);
+
+    return rc;
+}
+
+
+
+/** Virtual function table for the DWARF debug info reader. */
+DECL_HIDDEN_CONST(RTDBGMODVTDBG) const g_rtDbgModVtDbgDwarf =
+{
+    /*.u32Magic = */            RTDBGMODVTDBG_MAGIC,
+    /*.fSupports = */           RT_DBGTYPE_DWARF,
+    /*.pszName = */             "dwarf",
+    /*.pfnTryOpen = */          rtDbgModDwarf_TryOpen,
+    /*.pfnClose = */            rtDbgModDwarf_Close,
+
+    /*.pfnRvaToSegOff = */      rtDbgModDwarf_RvaToSegOff,
+    /*.pfnImageSize = */        rtDbgModDwarf_ImageSize,
+
+    /*.pfnSegmentAdd = */       rtDbgModDwarf_SegmentAdd,
+    /*.pfnSegmentCount = */     rtDbgModDwarf_SegmentCount,
+    /*.pfnSegmentByIndex = */   rtDbgModDwarf_SegmentByIndex,
+
+    /*.pfnSymbolAdd = */        rtDbgModDwarf_SymbolAdd,
+    /*.pfnSymbolCount = */      rtDbgModDwarf_SymbolCount,
+    /*.pfnSymbolByOrdinal = */  rtDbgModDwarf_SymbolByOrdinal,
+    /*.pfnSymbolByName = */     rtDbgModDwarf_SymbolByName,
+    /*.pfnSymbolByAddr = */     rtDbgModDwarf_SymbolByAddr,
+
+    /*.pfnLineAdd = */          rtDbgModDwarf_LineAdd,
+    /*.pfnLineCount = */        rtDbgModDwarf_LineCount,
+    /*.pfnLineByOrdinal = */    rtDbgModDwarf_LineByOrdinal,
+    /*.pfnLineByAddr = */       rtDbgModDwarf_LineByAddr,
+
+    /*.pfnUnwindFrame = */      rtDbgModDwarf_UnwindFrame,
+
+    /*.u32EndMagic = */         RTDBGMODVTDBG_MAGIC
+};
+