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-rw-r--r--arch/x86/tools/.gitignore2
-rw-r--r--arch/x86/tools/Makefile46
-rw-r--r--arch/x86/tools/chkobjdump.awk34
-rw-r--r--arch/x86/tools/gen-insn-attr-x86.awk441
-rw-r--r--arch/x86/tools/insn_decoder_test.c174
-rw-r--r--arch/x86/tools/insn_sanity.c265
-rw-r--r--arch/x86/tools/objdump_reformat.awk48
-rw-r--r--arch/x86/tools/relocs.c1195
-rw-r--r--arch/x86/tools/relocs.h39
-rw-r--r--arch/x86/tools/relocs_32.c18
-rw-r--r--arch/x86/tools/relocs_64.c18
-rw-r--r--arch/x86/tools/relocs_common.c85
12 files changed, 2365 insertions, 0 deletions
diff --git a/arch/x86/tools/.gitignore b/arch/x86/tools/.gitignore
new file mode 100644
index 000000000..d36dc7cf9
--- /dev/null
+++ b/arch/x86/tools/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+relocs
diff --git a/arch/x86/tools/Makefile b/arch/x86/tools/Makefile
new file mode 100644
index 000000000..bddfc9a46
--- /dev/null
+++ b/arch/x86/tools/Makefile
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0
+PHONY += posttest
+
+ifeq ($(KBUILD_VERBOSE),1)
+ posttest_verbose = -v
+else
+ posttest_verbose =
+endif
+
+ifeq ($(CONFIG_64BIT),y)
+ posttest_64bit = -y
+else
+ posttest_64bit = -n
+endif
+
+reformatter = $(srctree)/arch/x86/tools/objdump_reformat.awk
+chkobjdump = $(srctree)/arch/x86/tools/chkobjdump.awk
+
+quiet_cmd_posttest = TEST $@
+ cmd_posttest = ($(OBJDUMP) -v | $(AWK) -f $(chkobjdump)) || $(OBJDUMP) -d -j .text $(objtree)/vmlinux | $(AWK) -f $(reformatter) | $(obj)/insn_decoder_test $(posttest_64bit) $(posttest_verbose)
+
+quiet_cmd_sanitytest = TEST $@
+ cmd_sanitytest = $(obj)/insn_sanity $(posttest_64bit) -m 1000000
+
+posttest: $(obj)/insn_decoder_test vmlinux $(obj)/insn_sanity
+ $(call cmd,posttest)
+ $(call cmd,sanitytest)
+
+hostprogs += insn_decoder_test insn_sanity
+
+# -I needed for generated C source and C source which in the kernel tree.
+HOSTCFLAGS_insn_decoder_test.o := -Wall -I$(srctree)/tools/arch/x86/lib/ -I$(srctree)/tools/arch/x86/include/ -I$(objtree)/arch/x86/lib/
+
+HOSTCFLAGS_insn_sanity.o := -Wall -I$(srctree)/tools/arch/x86/lib/ -I$(srctree)/tools/arch/x86/include/ -I$(objtree)/arch/x86/lib/
+
+# Dependencies are also needed.
+$(obj)/insn_decoder_test.o: $(srctree)/tools/arch/x86/lib/insn.c $(srctree)/tools/arch/x86/lib/inat.c $(srctree)/tools/arch/x86/include/asm/inat_types.h $(srctree)/tools/arch/x86/include/asm/inat.h $(srctree)/tools/arch/x86/include/asm/insn.h $(objtree)/arch/x86/lib/inat-tables.c
+
+$(obj)/insn_sanity.o: $(srctree)/tools/arch/x86/lib/insn.c $(srctree)/tools/arch/x86/lib/inat.c $(srctree)/tools/arch/x86/include/asm/inat_types.h $(srctree)/tools/arch/x86/include/asm/inat.h $(srctree)/tools/arch/x86/include/asm/insn.h $(objtree)/arch/x86/lib/inat-tables.c
+
+HOST_EXTRACFLAGS += -I$(srctree)/tools/include
+hostprogs += relocs
+relocs-objs := relocs_32.o relocs_64.o relocs_common.o
+PHONY += relocs
+relocs: $(obj)/relocs
+ @:
diff --git a/arch/x86/tools/chkobjdump.awk b/arch/x86/tools/chkobjdump.awk
new file mode 100644
index 000000000..a4cf678cf
--- /dev/null
+++ b/arch/x86/tools/chkobjdump.awk
@@ -0,0 +1,34 @@
+# GNU objdump version checker
+#
+# Usage:
+# objdump -v | awk -f chkobjdump.awk
+BEGIN {
+ # objdump version 2.19 or later is OK for the test.
+ od_ver = 2;
+ od_sver = 19;
+}
+
+/^GNU objdump/ {
+ verstr = ""
+ gsub(/\(.*\)/, "");
+ for (i = 3; i <= NF; i++)
+ if (match($(i), "^[0-9]")) {
+ verstr = $(i);
+ break;
+ }
+ if (verstr == "") {
+ printf("Warning: Failed to find objdump version number.\n");
+ exit 0;
+ }
+ split(verstr, ver, ".");
+ if (ver[1] > od_ver ||
+ (ver[1] == od_ver && ver[2] >= od_sver)) {
+ exit 1;
+ } else {
+ printf("Warning: objdump version %s is older than %d.%d\n",
+ verstr, od_ver, od_sver);
+ print("Warning: Skipping posttest.");
+ # Logic is inverted, because we just skip test without error.
+ exit 0;
+ }
+}
diff --git a/arch/x86/tools/gen-insn-attr-x86.awk b/arch/x86/tools/gen-insn-attr-x86.awk
new file mode 100644
index 000000000..af38469af
--- /dev/null
+++ b/arch/x86/tools/gen-insn-attr-x86.awk
@@ -0,0 +1,441 @@
+#!/bin/awk -f
+# SPDX-License-Identifier: GPL-2.0
+# gen-insn-attr-x86.awk: Instruction attribute table generator
+# Written by Masami Hiramatsu <mhiramat@redhat.com>
+#
+# Usage: awk -f gen-insn-attr-x86.awk x86-opcode-map.txt > inat-tables.c
+
+# Awk implementation sanity check
+function check_awk_implement() {
+ if (sprintf("%x", 0) != "0")
+ return "Your awk has a printf-format problem."
+ return ""
+}
+
+# Clear working vars
+function clear_vars() {
+ delete table
+ delete lptable2
+ delete lptable1
+ delete lptable3
+ eid = -1 # escape id
+ gid = -1 # group id
+ aid = -1 # AVX id
+ tname = ""
+}
+
+BEGIN {
+ # Implementation error checking
+ awkchecked = check_awk_implement()
+ if (awkchecked != "") {
+ print "Error: " awkchecked > "/dev/stderr"
+ print "Please try to use gawk." > "/dev/stderr"
+ exit 1
+ }
+
+ # Setup generating tables
+ print "/* x86 opcode map generated from x86-opcode-map.txt */"
+ print "/* Do not change this code. */\n"
+ ggid = 1
+ geid = 1
+ gaid = 0
+ delete etable
+ delete gtable
+ delete atable
+
+ opnd_expr = "^[A-Za-z/]"
+ ext_expr = "^\\("
+ sep_expr = "^\\|$"
+ group_expr = "^Grp[0-9A-Za-z]+"
+
+ imm_expr = "^[IJAOL][a-z]"
+ imm_flag["Ib"] = "INAT_MAKE_IMM(INAT_IMM_BYTE)"
+ imm_flag["Jb"] = "INAT_MAKE_IMM(INAT_IMM_BYTE)"
+ imm_flag["Iw"] = "INAT_MAKE_IMM(INAT_IMM_WORD)"
+ imm_flag["Id"] = "INAT_MAKE_IMM(INAT_IMM_DWORD)"
+ imm_flag["Iq"] = "INAT_MAKE_IMM(INAT_IMM_QWORD)"
+ imm_flag["Ap"] = "INAT_MAKE_IMM(INAT_IMM_PTR)"
+ imm_flag["Iz"] = "INAT_MAKE_IMM(INAT_IMM_VWORD32)"
+ imm_flag["Jz"] = "INAT_MAKE_IMM(INAT_IMM_VWORD32)"
+ imm_flag["Iv"] = "INAT_MAKE_IMM(INAT_IMM_VWORD)"
+ imm_flag["Ob"] = "INAT_MOFFSET"
+ imm_flag["Ov"] = "INAT_MOFFSET"
+ imm_flag["Lx"] = "INAT_MAKE_IMM(INAT_IMM_BYTE)"
+
+ modrm_expr = "^([CDEGMNPQRSUVW/][a-z]+|NTA|T[012])"
+ force64_expr = "\\([df]64\\)"
+ rex_expr = "^REX(\\.[XRWB]+)*"
+ fpu_expr = "^ESC" # TODO
+
+ lprefix1_expr = "\\((66|!F3)\\)"
+ lprefix2_expr = "\\(F3\\)"
+ lprefix3_expr = "\\((F2|!F3|66&F2)\\)"
+ lprefix_expr = "\\((66|F2|F3)\\)"
+ max_lprefix = 4
+
+ # All opcodes starting with lower-case 'v', 'k' or with (v1) superscript
+ # accepts VEX prefix
+ vexok_opcode_expr = "^[vk].*"
+ vexok_expr = "\\(v1\\)"
+ # All opcodes with (v) superscript supports *only* VEX prefix
+ vexonly_expr = "\\(v\\)"
+ # All opcodes with (ev) superscript supports *only* EVEX prefix
+ evexonly_expr = "\\(ev\\)"
+
+ prefix_expr = "\\(Prefix\\)"
+ prefix_num["Operand-Size"] = "INAT_PFX_OPNDSZ"
+ prefix_num["REPNE"] = "INAT_PFX_REPNE"
+ prefix_num["REP/REPE"] = "INAT_PFX_REPE"
+ prefix_num["XACQUIRE"] = "INAT_PFX_REPNE"
+ prefix_num["XRELEASE"] = "INAT_PFX_REPE"
+ prefix_num["LOCK"] = "INAT_PFX_LOCK"
+ prefix_num["SEG=CS"] = "INAT_PFX_CS"
+ prefix_num["SEG=DS"] = "INAT_PFX_DS"
+ prefix_num["SEG=ES"] = "INAT_PFX_ES"
+ prefix_num["SEG=FS"] = "INAT_PFX_FS"
+ prefix_num["SEG=GS"] = "INAT_PFX_GS"
+ prefix_num["SEG=SS"] = "INAT_PFX_SS"
+ prefix_num["Address-Size"] = "INAT_PFX_ADDRSZ"
+ prefix_num["VEX+1byte"] = "INAT_PFX_VEX2"
+ prefix_num["VEX+2byte"] = "INAT_PFX_VEX3"
+ prefix_num["EVEX"] = "INAT_PFX_EVEX"
+
+ clear_vars()
+}
+
+function semantic_error(msg) {
+ print "Semantic error at " NR ": " msg > "/dev/stderr"
+ exit 1
+}
+
+function debug(msg) {
+ print "DEBUG: " msg
+}
+
+function array_size(arr, i,c) {
+ c = 0
+ for (i in arr)
+ c++
+ return c
+}
+
+/^Table:/ {
+ print "/* " $0 " */"
+ if (tname != "")
+ semantic_error("Hit Table: before EndTable:.");
+}
+
+/^Referrer:/ {
+ if (NF != 1) {
+ # escape opcode table
+ ref = ""
+ for (i = 2; i <= NF; i++)
+ ref = ref $i
+ eid = escape[ref]
+ tname = sprintf("inat_escape_table_%d", eid)
+ }
+}
+
+/^AVXcode:/ {
+ if (NF != 1) {
+ # AVX/escape opcode table
+ aid = $2
+ if (gaid <= aid)
+ gaid = aid + 1
+ if (tname == "") # AVX only opcode table
+ tname = sprintf("inat_avx_table_%d", $2)
+ }
+ if (aid == -1 && eid == -1) # primary opcode table
+ tname = "inat_primary_table"
+}
+
+/^GrpTable:/ {
+ print "/* " $0 " */"
+ if (!($2 in group))
+ semantic_error("No group: " $2 )
+ gid = group[$2]
+ tname = "inat_group_table_" gid
+}
+
+function print_table(tbl,name,fmt,n)
+{
+ print "const insn_attr_t " name " = {"
+ for (i = 0; i < n; i++) {
+ id = sprintf(fmt, i)
+ if (tbl[id])
+ print " [" id "] = " tbl[id] ","
+ }
+ print "};"
+}
+
+/^EndTable/ {
+ if (gid != -1) {
+ # print group tables
+ if (array_size(table) != 0) {
+ print_table(table, tname "[INAT_GROUP_TABLE_SIZE]",
+ "0x%x", 8)
+ gtable[gid,0] = tname
+ }
+ if (array_size(lptable1) != 0) {
+ print_table(lptable1, tname "_1[INAT_GROUP_TABLE_SIZE]",
+ "0x%x", 8)
+ gtable[gid,1] = tname "_1"
+ }
+ if (array_size(lptable2) != 0) {
+ print_table(lptable2, tname "_2[INAT_GROUP_TABLE_SIZE]",
+ "0x%x", 8)
+ gtable[gid,2] = tname "_2"
+ }
+ if (array_size(lptable3) != 0) {
+ print_table(lptable3, tname "_3[INAT_GROUP_TABLE_SIZE]",
+ "0x%x", 8)
+ gtable[gid,3] = tname "_3"
+ }
+ } else {
+ # print primary/escaped tables
+ if (array_size(table) != 0) {
+ print_table(table, tname "[INAT_OPCODE_TABLE_SIZE]",
+ "0x%02x", 256)
+ etable[eid,0] = tname
+ if (aid >= 0)
+ atable[aid,0] = tname
+ }
+ if (array_size(lptable1) != 0) {
+ print_table(lptable1,tname "_1[INAT_OPCODE_TABLE_SIZE]",
+ "0x%02x", 256)
+ etable[eid,1] = tname "_1"
+ if (aid >= 0)
+ atable[aid,1] = tname "_1"
+ }
+ if (array_size(lptable2) != 0) {
+ print_table(lptable2,tname "_2[INAT_OPCODE_TABLE_SIZE]",
+ "0x%02x", 256)
+ etable[eid,2] = tname "_2"
+ if (aid >= 0)
+ atable[aid,2] = tname "_2"
+ }
+ if (array_size(lptable3) != 0) {
+ print_table(lptable3,tname "_3[INAT_OPCODE_TABLE_SIZE]",
+ "0x%02x", 256)
+ etable[eid,3] = tname "_3"
+ if (aid >= 0)
+ atable[aid,3] = tname "_3"
+ }
+ }
+ print ""
+ clear_vars()
+}
+
+function add_flags(old,new) {
+ if (old && new)
+ return old " | " new
+ else if (old)
+ return old
+ else
+ return new
+}
+
+# convert operands to flags.
+function convert_operands(count,opnd, i,j,imm,mod)
+{
+ imm = null
+ mod = null
+ for (j = 1; j <= count; j++) {
+ i = opnd[j]
+ if (match(i, imm_expr) == 1) {
+ if (!imm_flag[i])
+ semantic_error("Unknown imm opnd: " i)
+ if (imm) {
+ if (i != "Ib")
+ semantic_error("Second IMM error")
+ imm = add_flags(imm, "INAT_SCNDIMM")
+ } else
+ imm = imm_flag[i]
+ } else if (match(i, modrm_expr))
+ mod = "INAT_MODRM"
+ }
+ return add_flags(imm, mod)
+}
+
+/^[0-9a-f]+:/ {
+ if (NR == 1)
+ next
+ # get index
+ idx = "0x" substr($1, 1, index($1,":") - 1)
+ if (idx in table)
+ semantic_error("Redefine " idx " in " tname)
+
+ # check if escaped opcode
+ if ("escape" == $2) {
+ if ($3 != "#")
+ semantic_error("No escaped name")
+ ref = ""
+ for (i = 4; i <= NF; i++)
+ ref = ref $i
+ if (ref in escape)
+ semantic_error("Redefine escape (" ref ")")
+ escape[ref] = geid
+ geid++
+ table[idx] = "INAT_MAKE_ESCAPE(" escape[ref] ")"
+ next
+ }
+
+ variant = null
+ # converts
+ i = 2
+ while (i <= NF) {
+ opcode = $(i++)
+ delete opnds
+ ext = null
+ flags = null
+ opnd = null
+ # parse one opcode
+ if (match($i, opnd_expr)) {
+ opnd = $i
+ count = split($(i++), opnds, ",")
+ flags = convert_operands(count, opnds)
+ }
+ if (match($i, ext_expr))
+ ext = $(i++)
+ if (match($i, sep_expr))
+ i++
+ else if (i < NF)
+ semantic_error($i " is not a separator")
+
+ # check if group opcode
+ if (match(opcode, group_expr)) {
+ if (!(opcode in group)) {
+ group[opcode] = ggid
+ ggid++
+ }
+ flags = add_flags(flags, "INAT_MAKE_GROUP(" group[opcode] ")")
+ }
+ # check force(or default) 64bit
+ if (match(ext, force64_expr))
+ flags = add_flags(flags, "INAT_FORCE64")
+
+ # check REX prefix
+ if (match(opcode, rex_expr))
+ flags = add_flags(flags, "INAT_MAKE_PREFIX(INAT_PFX_REX)")
+
+ # check coprocessor escape : TODO
+ if (match(opcode, fpu_expr))
+ flags = add_flags(flags, "INAT_MODRM")
+
+ # check VEX codes
+ if (match(ext, evexonly_expr))
+ flags = add_flags(flags, "INAT_VEXOK | INAT_EVEXONLY")
+ else if (match(ext, vexonly_expr))
+ flags = add_flags(flags, "INAT_VEXOK | INAT_VEXONLY")
+ else if (match(ext, vexok_expr) || match(opcode, vexok_opcode_expr))
+ flags = add_flags(flags, "INAT_VEXOK")
+
+ # check prefixes
+ if (match(ext, prefix_expr)) {
+ if (!prefix_num[opcode])
+ semantic_error("Unknown prefix: " opcode)
+ flags = add_flags(flags, "INAT_MAKE_PREFIX(" prefix_num[opcode] ")")
+ }
+ if (length(flags) == 0)
+ continue
+ # check if last prefix
+ if (match(ext, lprefix1_expr)) {
+ lptable1[idx] = add_flags(lptable1[idx],flags)
+ variant = "INAT_VARIANT"
+ }
+ if (match(ext, lprefix2_expr)) {
+ lptable2[idx] = add_flags(lptable2[idx],flags)
+ variant = "INAT_VARIANT"
+ }
+ if (match(ext, lprefix3_expr)) {
+ lptable3[idx] = add_flags(lptable3[idx],flags)
+ variant = "INAT_VARIANT"
+ }
+ if (!match(ext, lprefix_expr)){
+ table[idx] = add_flags(table[idx],flags)
+ }
+ }
+ if (variant)
+ table[idx] = add_flags(table[idx],variant)
+}
+
+END {
+ if (awkchecked != "")
+ exit 1
+
+ print "#ifndef __BOOT_COMPRESSED\n"
+
+ # print escape opcode map's array
+ print "/* Escape opcode map array */"
+ print "const insn_attr_t * const inat_escape_tables[INAT_ESC_MAX + 1]" \
+ "[INAT_LSTPFX_MAX + 1] = {"
+ for (i = 0; i < geid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (etable[i,j])
+ print " ["i"]["j"] = "etable[i,j]","
+ print "};\n"
+ # print group opcode map's array
+ print "/* Group opcode map array */"
+ print "const insn_attr_t * const inat_group_tables[INAT_GRP_MAX + 1]"\
+ "[INAT_LSTPFX_MAX + 1] = {"
+ for (i = 0; i < ggid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (gtable[i,j])
+ print " ["i"]["j"] = "gtable[i,j]","
+ print "};\n"
+ # print AVX opcode map's array
+ print "/* AVX opcode map array */"
+ print "const insn_attr_t * const inat_avx_tables[X86_VEX_M_MAX + 1]"\
+ "[INAT_LSTPFX_MAX + 1] = {"
+ for (i = 0; i < gaid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (atable[i,j])
+ print " ["i"]["j"] = "atable[i,j]","
+ print "};\n"
+
+ print "#else /* !__BOOT_COMPRESSED */\n"
+
+ print "/* Escape opcode map array */"
+ print "static const insn_attr_t *inat_escape_tables[INAT_ESC_MAX + 1]" \
+ "[INAT_LSTPFX_MAX + 1];"
+ print ""
+
+ print "/* Group opcode map array */"
+ print "static const insn_attr_t *inat_group_tables[INAT_GRP_MAX + 1]"\
+ "[INAT_LSTPFX_MAX + 1];"
+ print ""
+
+ print "/* AVX opcode map array */"
+ print "static const insn_attr_t *inat_avx_tables[X86_VEX_M_MAX + 1]"\
+ "[INAT_LSTPFX_MAX + 1];"
+ print ""
+
+ print "static void inat_init_tables(void)"
+ print "{"
+
+ # print escape opcode map's array
+ print "\t/* Print Escape opcode map array */"
+ for (i = 0; i < geid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (etable[i,j])
+ print "\tinat_escape_tables["i"]["j"] = "etable[i,j]";"
+ print ""
+
+ # print group opcode map's array
+ print "\t/* Print Group opcode map array */"
+ for (i = 0; i < ggid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (gtable[i,j])
+ print "\tinat_group_tables["i"]["j"] = "gtable[i,j]";"
+ print ""
+ # print AVX opcode map's array
+ print "\t/* Print AVX opcode map array */"
+ for (i = 0; i < gaid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (atable[i,j])
+ print "\tinat_avx_tables["i"]["j"] = "atable[i,j]";"
+
+ print "}"
+ print "#endif"
+}
+
diff --git a/arch/x86/tools/insn_decoder_test.c b/arch/x86/tools/insn_decoder_test.c
new file mode 100644
index 000000000..472540aea
--- /dev/null
+++ b/arch/x86/tools/insn_decoder_test.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright (C) IBM Corporation, 2009
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+#include <stdarg.h>
+
+#define unlikely(cond) (cond)
+
+#include <asm/insn.h>
+#include <inat.c>
+#include <insn.c>
+
+/*
+ * Test of instruction analysis in general and insn_get_length() in
+ * particular. See if insn_get_length() and the disassembler agree
+ * on the length of each instruction in an elf disassembly.
+ *
+ * Usage: objdump -d a.out | awk -f objdump_reformat.awk | ./insn_decoder_test
+ */
+
+const char *prog;
+static int verbose;
+static int x86_64;
+
+static void usage(void)
+{
+ fprintf(stderr, "Usage: objdump -d a.out | awk -f objdump_reformat.awk"
+ " | %s [-y|-n] [-v]\n", prog);
+ fprintf(stderr, "\t-y 64bit mode\n");
+ fprintf(stderr, "\t-n 32bit mode\n");
+ fprintf(stderr, "\t-v verbose mode\n");
+ exit(1);
+}
+
+static void malformed_line(const char *line, int line_nr)
+{
+ fprintf(stderr, "%s: error: malformed line %d:\n%s",
+ prog, line_nr, line);
+ exit(3);
+}
+
+static void pr_warn(const char *fmt, ...)
+{
+ va_list ap;
+
+ fprintf(stderr, "%s: warning: ", prog);
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+}
+
+static void dump_field(FILE *fp, const char *name, const char *indent,
+ struct insn_field *field)
+{
+ fprintf(fp, "%s.%s = {\n", indent, name);
+ fprintf(fp, "%s\t.value = %d, bytes[] = {%x, %x, %x, %x},\n",
+ indent, field->value, field->bytes[0], field->bytes[1],
+ field->bytes[2], field->bytes[3]);
+ fprintf(fp, "%s\t.got = %d, .nbytes = %d},\n", indent,
+ field->got, field->nbytes);
+}
+
+static void dump_insn(FILE *fp, struct insn *insn)
+{
+ fprintf(fp, "Instruction = {\n");
+ dump_field(fp, "prefixes", "\t", &insn->prefixes);
+ dump_field(fp, "rex_prefix", "\t", &insn->rex_prefix);
+ dump_field(fp, "vex_prefix", "\t", &insn->vex_prefix);
+ dump_field(fp, "opcode", "\t", &insn->opcode);
+ dump_field(fp, "modrm", "\t", &insn->modrm);
+ dump_field(fp, "sib", "\t", &insn->sib);
+ dump_field(fp, "displacement", "\t", &insn->displacement);
+ dump_field(fp, "immediate1", "\t", &insn->immediate1);
+ dump_field(fp, "immediate2", "\t", &insn->immediate2);
+ fprintf(fp, "\t.attr = %x, .opnd_bytes = %d, .addr_bytes = %d,\n",
+ insn->attr, insn->opnd_bytes, insn->addr_bytes);
+ fprintf(fp, "\t.length = %d, .x86_64 = %d, .kaddr = %p}\n",
+ insn->length, insn->x86_64, insn->kaddr);
+}
+
+static void parse_args(int argc, char **argv)
+{
+ int c;
+ prog = argv[0];
+ while ((c = getopt(argc, argv, "ynv")) != -1) {
+ switch (c) {
+ case 'y':
+ x86_64 = 1;
+ break;
+ case 'n':
+ x86_64 = 0;
+ break;
+ case 'v':
+ verbose = 1;
+ break;
+ default:
+ usage();
+ }
+ }
+}
+
+#define BUFSIZE 256
+
+int main(int argc, char **argv)
+{
+ char line[BUFSIZE], sym[BUFSIZE] = "<unknown>";
+ unsigned char insn_buff[16];
+ struct insn insn;
+ int insns = 0;
+ int warnings = 0;
+
+ parse_args(argc, argv);
+
+ while (fgets(line, BUFSIZE, stdin)) {
+ char copy[BUFSIZE], *s, *tab1, *tab2;
+ int nb = 0, ret;
+ unsigned int b;
+
+ if (line[0] == '<') {
+ /* Symbol line */
+ strcpy(sym, line);
+ continue;
+ }
+
+ insns++;
+ memset(insn_buff, 0, 16);
+ strcpy(copy, line);
+ tab1 = strchr(copy, '\t');
+ if (!tab1)
+ malformed_line(line, insns);
+ s = tab1 + 1;
+ s += strspn(s, " ");
+ tab2 = strchr(s, '\t');
+ if (!tab2)
+ malformed_line(line, insns);
+ *tab2 = '\0'; /* Characters beyond tab2 aren't examined */
+ while (s < tab2) {
+ if (sscanf(s, "%x", &b) == 1) {
+ insn_buff[nb++] = (unsigned char) b;
+ s += 3;
+ } else
+ break;
+ }
+
+ /* Decode an instruction */
+ ret = insn_decode(&insn, insn_buff, sizeof(insn_buff),
+ x86_64 ? INSN_MODE_64 : INSN_MODE_32);
+
+ if (ret < 0 || insn.length != nb) {
+ warnings++;
+ pr_warn("Found an x86 instruction decoder bug, "
+ "please report this.\n", sym);
+ pr_warn("%s", line);
+ pr_warn("objdump says %d bytes, but insn_get_length() "
+ "says %d\n", nb, insn.length);
+ if (verbose)
+ dump_insn(stderr, &insn);
+ }
+ }
+ if (warnings)
+ pr_warn("Decoded and checked %d instructions with %d "
+ "failures\n", insns, warnings);
+ else
+ fprintf(stdout, "%s: success: Decoded and checked %d"
+ " instructions\n", prog, insns);
+ return 0;
+}
diff --git a/arch/x86/tools/insn_sanity.c b/arch/x86/tools/insn_sanity.c
new file mode 100644
index 000000000..213f35f94
--- /dev/null
+++ b/arch/x86/tools/insn_sanity.c
@@ -0,0 +1,265 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * x86 decoder sanity test - based on test_get_insn.c
+ *
+ * Copyright (C) IBM Corporation, 2009
+ * Copyright (C) Hitachi, Ltd., 2011
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <asm/insn.h>
+#include <inat.c>
+#include <insn.c>
+
+/*
+ * Test of instruction analysis against tampering.
+ * Feed random binary to instruction decoder and ensure not to
+ * access out-of-instruction-buffer.
+ */
+
+#define DEFAULT_MAX_ITER 10000
+#define INSN_NOP 0x90
+
+static const char *prog; /* Program name */
+static int verbose; /* Verbosity */
+static int x86_64; /* x86-64 bit mode flag */
+static unsigned int seed; /* Random seed */
+static unsigned long iter_start; /* Start of iteration number */
+static unsigned long iter_end = DEFAULT_MAX_ITER; /* End of iteration number */
+static FILE *input_file; /* Input file name */
+
+static void usage(const char *err)
+{
+ if (err)
+ fprintf(stderr, "%s: Error: %s\n\n", prog, err);
+ fprintf(stderr, "Usage: %s [-y|-n|-v] [-s seed[,no]] [-m max] [-i input]\n", prog);
+ fprintf(stderr, "\t-y 64bit mode\n");
+ fprintf(stderr, "\t-n 32bit mode\n");
+ fprintf(stderr, "\t-v Verbosity(-vv dumps any decoded result)\n");
+ fprintf(stderr, "\t-s Give a random seed (and iteration number)\n");
+ fprintf(stderr, "\t-m Give a maximum iteration number\n");
+ fprintf(stderr, "\t-i Give an input file with decoded binary\n");
+ exit(1);
+}
+
+static void dump_field(FILE *fp, const char *name, const char *indent,
+ struct insn_field *field)
+{
+ fprintf(fp, "%s.%s = {\n", indent, name);
+ fprintf(fp, "%s\t.value = %d, bytes[] = {%x, %x, %x, %x},\n",
+ indent, field->value, field->bytes[0], field->bytes[1],
+ field->bytes[2], field->bytes[3]);
+ fprintf(fp, "%s\t.got = %d, .nbytes = %d},\n", indent,
+ field->got, field->nbytes);
+}
+
+static void dump_insn(FILE *fp, struct insn *insn)
+{
+ fprintf(fp, "Instruction = {\n");
+ dump_field(fp, "prefixes", "\t", &insn->prefixes);
+ dump_field(fp, "rex_prefix", "\t", &insn->rex_prefix);
+ dump_field(fp, "vex_prefix", "\t", &insn->vex_prefix);
+ dump_field(fp, "opcode", "\t", &insn->opcode);
+ dump_field(fp, "modrm", "\t", &insn->modrm);
+ dump_field(fp, "sib", "\t", &insn->sib);
+ dump_field(fp, "displacement", "\t", &insn->displacement);
+ dump_field(fp, "immediate1", "\t", &insn->immediate1);
+ dump_field(fp, "immediate2", "\t", &insn->immediate2);
+ fprintf(fp, "\t.attr = %x, .opnd_bytes = %d, .addr_bytes = %d,\n",
+ insn->attr, insn->opnd_bytes, insn->addr_bytes);
+ fprintf(fp, "\t.length = %d, .x86_64 = %d, .kaddr = %p}\n",
+ insn->length, insn->x86_64, insn->kaddr);
+}
+
+static void dump_stream(FILE *fp, const char *msg, unsigned long nr_iter,
+ unsigned char *insn_buff, struct insn *insn)
+{
+ int i;
+
+ fprintf(fp, "%s:\n", msg);
+
+ dump_insn(fp, insn);
+
+ fprintf(fp, "You can reproduce this with below command(s);\n");
+
+ /* Input a decoded instruction sequence directly */
+ fprintf(fp, " $ echo ");
+ for (i = 0; i < MAX_INSN_SIZE; i++)
+ fprintf(fp, " %02x", insn_buff[i]);
+ fprintf(fp, " | %s -i -\n", prog);
+
+ if (!input_file) {
+ fprintf(fp, "Or \n");
+ /* Give a seed and iteration number */
+ fprintf(fp, " $ %s -s 0x%x,%lu\n", prog, seed, nr_iter);
+ }
+}
+
+static void init_random_seed(void)
+{
+ int fd;
+
+ fd = open("/dev/urandom", O_RDONLY);
+ if (fd < 0)
+ goto fail;
+
+ if (read(fd, &seed, sizeof(seed)) != sizeof(seed))
+ goto fail;
+
+ close(fd);
+ return;
+fail:
+ usage("Failed to open /dev/urandom");
+}
+
+/* Read given instruction sequence from the input file */
+static int read_next_insn(unsigned char *insn_buff)
+{
+ char buf[256] = "", *tmp;
+ int i;
+
+ tmp = fgets(buf, ARRAY_SIZE(buf), input_file);
+ if (tmp == NULL || feof(input_file))
+ return 0;
+
+ for (i = 0; i < MAX_INSN_SIZE; i++) {
+ insn_buff[i] = (unsigned char)strtoul(tmp, &tmp, 16);
+ if (*tmp != ' ')
+ break;
+ }
+
+ return i;
+}
+
+static int generate_insn(unsigned char *insn_buff)
+{
+ int i;
+
+ if (input_file)
+ return read_next_insn(insn_buff);
+
+ /* Fills buffer with random binary up to MAX_INSN_SIZE */
+ for (i = 0; i < MAX_INSN_SIZE - 1; i += 2)
+ *(unsigned short *)(&insn_buff[i]) = random() & 0xffff;
+
+ while (i < MAX_INSN_SIZE)
+ insn_buff[i++] = random() & 0xff;
+
+ return i;
+}
+
+static void parse_args(int argc, char **argv)
+{
+ int c;
+ char *tmp = NULL;
+ int set_seed = 0;
+
+ prog = argv[0];
+ while ((c = getopt(argc, argv, "ynvs:m:i:")) != -1) {
+ switch (c) {
+ case 'y':
+ x86_64 = 1;
+ break;
+ case 'n':
+ x86_64 = 0;
+ break;
+ case 'v':
+ verbose++;
+ break;
+ case 'i':
+ if (strcmp("-", optarg) == 0)
+ input_file = stdin;
+ else
+ input_file = fopen(optarg, "r");
+ if (!input_file)
+ usage("Failed to open input file");
+ break;
+ case 's':
+ seed = (unsigned int)strtoul(optarg, &tmp, 0);
+ if (*tmp == ',') {
+ optarg = tmp + 1;
+ iter_start = strtoul(optarg, &tmp, 0);
+ }
+ if (*tmp != '\0' || tmp == optarg)
+ usage("Failed to parse seed");
+ set_seed = 1;
+ break;
+ case 'm':
+ iter_end = strtoul(optarg, &tmp, 0);
+ if (*tmp != '\0' || tmp == optarg)
+ usage("Failed to parse max_iter");
+ break;
+ default:
+ usage(NULL);
+ }
+ }
+
+ /* Check errors */
+ if (iter_end < iter_start)
+ usage("Max iteration number must be bigger than iter-num");
+
+ if (set_seed && input_file)
+ usage("Don't use input file (-i) with random seed (-s)");
+
+ /* Initialize random seed */
+ if (!input_file) {
+ if (!set_seed) /* No seed is given */
+ init_random_seed();
+ srand(seed);
+ }
+}
+
+int main(int argc, char **argv)
+{
+ int insns = 0, ret;
+ struct insn insn;
+ int errors = 0;
+ unsigned long i;
+ unsigned char insn_buff[MAX_INSN_SIZE * 2];
+
+ parse_args(argc, argv);
+
+ /* Prepare stop bytes with NOPs */
+ memset(insn_buff + MAX_INSN_SIZE, INSN_NOP, MAX_INSN_SIZE);
+
+ for (i = 0; i < iter_end; i++) {
+ if (generate_insn(insn_buff) <= 0)
+ break;
+
+ if (i < iter_start) /* Skip to given iteration number */
+ continue;
+
+ /* Decode an instruction */
+ ret = insn_decode(&insn, insn_buff, sizeof(insn_buff),
+ x86_64 ? INSN_MODE_64 : INSN_MODE_32);
+
+ if (insn.next_byte <= insn.kaddr ||
+ insn.kaddr + MAX_INSN_SIZE < insn.next_byte) {
+ /* Access out-of-range memory */
+ dump_stream(stderr, "Error: Found an access violation", i, insn_buff, &insn);
+ errors++;
+ } else if (verbose && ret < 0)
+ dump_stream(stdout, "Info: Found an undecodable input", i, insn_buff, &insn);
+ else if (verbose >= 2)
+ dump_insn(stdout, &insn);
+ insns++;
+ }
+
+ fprintf((errors) ? stderr : stdout,
+ "%s: %s: decoded and checked %d %s instructions with %d errors (seed:0x%x)\n",
+ prog,
+ (errors) ? "Failure" : "Success",
+ insns,
+ (input_file) ? "given" : "random",
+ errors,
+ seed);
+
+ return errors ? 1 : 0;
+}
diff --git a/arch/x86/tools/objdump_reformat.awk b/arch/x86/tools/objdump_reformat.awk
new file mode 100644
index 000000000..f418c91b7
--- /dev/null
+++ b/arch/x86/tools/objdump_reformat.awk
@@ -0,0 +1,48 @@
+#!/bin/awk -f
+# SPDX-License-Identifier: GPL-2.0
+# Usage: objdump -d a.out | awk -f objdump_reformat.awk | ./insn_decoder_test
+# Reformats the disassembly as follows:
+# - Removes all lines except the disassembled instructions.
+# - For instructions that exceed 1 line (7 bytes), crams all the hex bytes
+# into a single line.
+# - Remove bad(or prefix only) instructions
+
+BEGIN {
+ prev_addr = ""
+ prev_hex = ""
+ prev_mnemonic = ""
+ bad_expr = "(\\(bad\\)|^rex|^.byte|^rep(z|nz)$|^lock$|^es$|^cs$|^ss$|^ds$|^fs$|^gs$|^data(16|32)$|^addr(16|32|64))"
+ fwait_expr = "^9b "
+ fwait_str="9b\tfwait"
+}
+
+/^ *[0-9a-f]+ <[^>]*>:/ {
+ # Symbol entry
+ printf("%s%s\n", $2, $1)
+}
+
+/^ *[0-9a-f]+:/ {
+ if (split($0, field, "\t") < 3) {
+ # This is a continuation of the same insn.
+ prev_hex = prev_hex field[2]
+ } else {
+ # Skip bad instructions
+ if (match(prev_mnemonic, bad_expr))
+ prev_addr = ""
+ # Split fwait from other f* instructions
+ if (match(prev_hex, fwait_expr) && prev_mnemonic != "fwait") {
+ printf "%s\t%s\n", prev_addr, fwait_str
+ sub(fwait_expr, "", prev_hex)
+ }
+ if (prev_addr != "")
+ printf "%s\t%s\t%s\n", prev_addr, prev_hex, prev_mnemonic
+ prev_addr = field[1]
+ prev_hex = field[2]
+ prev_mnemonic = field[3]
+ }
+}
+
+END {
+ if (prev_addr != "")
+ printf "%s\t%s\t%s\n", prev_addr, prev_hex, prev_mnemonic
+}
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
new file mode 100644
index 000000000..2925074b9
--- /dev/null
+++ b/arch/x86/tools/relocs.c
@@ -0,0 +1,1195 @@
+// SPDX-License-Identifier: GPL-2.0
+/* This is included from relocs_32/64.c */
+
+#define ElfW(type) _ElfW(ELF_BITS, type)
+#define _ElfW(bits, type) __ElfW(bits, type)
+#define __ElfW(bits, type) Elf##bits##_##type
+
+#define Elf_Addr ElfW(Addr)
+#define Elf_Ehdr ElfW(Ehdr)
+#define Elf_Phdr ElfW(Phdr)
+#define Elf_Shdr ElfW(Shdr)
+#define Elf_Sym ElfW(Sym)
+
+static Elf_Ehdr ehdr;
+static unsigned long shnum;
+static unsigned int shstrndx;
+static unsigned int shsymtabndx;
+static unsigned int shxsymtabndx;
+
+static int sym_index(Elf_Sym *sym);
+
+struct relocs {
+ uint32_t *offset;
+ unsigned long count;
+ unsigned long size;
+};
+
+static struct relocs relocs16;
+static struct relocs relocs32;
+#if ELF_BITS == 64
+static struct relocs relocs32neg;
+static struct relocs relocs64;
+#define FMT PRIu64
+#else
+#define FMT PRIu32
+#endif
+
+struct section {
+ Elf_Shdr shdr;
+ struct section *link;
+ Elf_Sym *symtab;
+ Elf32_Word *xsymtab;
+ Elf_Rel *reltab;
+ char *strtab;
+};
+static struct section *secs;
+
+static const char * const sym_regex_kernel[S_NSYMTYPES] = {
+/*
+ * Following symbols have been audited. There values are constant and do
+ * not change if bzImage is loaded at a different physical address than
+ * the address for which it has been compiled. Don't warn user about
+ * absolute relocations present w.r.t these symbols.
+ */
+ [S_ABS] =
+ "^(xen_irq_disable_direct_reloc$|"
+ "xen_save_fl_direct_reloc$|"
+ "VDSO|"
+ "__kcfi_typeid_|"
+ "__crc_)",
+
+/*
+ * These symbols are known to be relative, even if the linker marks them
+ * as absolute (typically defined outside any section in the linker script.)
+ */
+ [S_REL] =
+ "^(__init_(begin|end)|"
+ "__x86_cpu_dev_(start|end)|"
+ "(__parainstructions|__alt_instructions)(_end)?|"
+ "(__iommu_table|__apicdrivers|__smp_locks)(_end)?|"
+ "__(start|end)_pci_.*|"
+#if CONFIG_FW_LOADER
+ "__(start|end)_builtin_fw|"
+#endif
+ "__(start|stop)___ksymtab(_gpl)?|"
+ "__(start|stop)___kcrctab(_gpl)?|"
+ "__(start|stop)___param|"
+ "__(start|stop)___modver|"
+ "__(start|stop)___bug_table|"
+ "__tracedata_(start|end)|"
+ "__(start|stop)_notes|"
+ "__end_rodata|"
+ "__end_rodata_aligned|"
+ "__initramfs_start|"
+ "(jiffies|jiffies_64)|"
+#if ELF_BITS == 64
+ "__per_cpu_load|"
+ "init_per_cpu__.*|"
+ "__end_rodata_hpage_align|"
+#endif
+ "__vvar_page|"
+ "_end)$"
+};
+
+
+static const char * const sym_regex_realmode[S_NSYMTYPES] = {
+/*
+ * These symbols are known to be relative, even if the linker marks them
+ * as absolute (typically defined outside any section in the linker script.)
+ */
+ [S_REL] =
+ "^pa_",
+
+/*
+ * These are 16-bit segment symbols when compiling 16-bit code.
+ */
+ [S_SEG] =
+ "^real_mode_seg$",
+
+/*
+ * These are offsets belonging to segments, as opposed to linear addresses,
+ * when compiling 16-bit code.
+ */
+ [S_LIN] =
+ "^pa_",
+};
+
+static const char * const *sym_regex;
+
+static regex_t sym_regex_c[S_NSYMTYPES];
+static int is_reloc(enum symtype type, const char *sym_name)
+{
+ return sym_regex[type] &&
+ !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0);
+}
+
+static void regex_init(int use_real_mode)
+{
+ char errbuf[128];
+ int err;
+ int i;
+
+ if (use_real_mode)
+ sym_regex = sym_regex_realmode;
+ else
+ sym_regex = sym_regex_kernel;
+
+ for (i = 0; i < S_NSYMTYPES; i++) {
+ if (!sym_regex[i])
+ continue;
+
+ err = regcomp(&sym_regex_c[i], sym_regex[i],
+ REG_EXTENDED|REG_NOSUB);
+
+ if (err) {
+ regerror(err, &sym_regex_c[i], errbuf, sizeof(errbuf));
+ die("%s", errbuf);
+ }
+ }
+}
+
+static const char *sym_type(unsigned type)
+{
+ static const char *type_name[] = {
+#define SYM_TYPE(X) [X] = #X
+ SYM_TYPE(STT_NOTYPE),
+ SYM_TYPE(STT_OBJECT),
+ SYM_TYPE(STT_FUNC),
+ SYM_TYPE(STT_SECTION),
+ SYM_TYPE(STT_FILE),
+ SYM_TYPE(STT_COMMON),
+ SYM_TYPE(STT_TLS),
+#undef SYM_TYPE
+ };
+ const char *name = "unknown sym type name";
+ if (type < ARRAY_SIZE(type_name)) {
+ name = type_name[type];
+ }
+ return name;
+}
+
+static const char *sym_bind(unsigned bind)
+{
+ static const char *bind_name[] = {
+#define SYM_BIND(X) [X] = #X
+ SYM_BIND(STB_LOCAL),
+ SYM_BIND(STB_GLOBAL),
+ SYM_BIND(STB_WEAK),
+#undef SYM_BIND
+ };
+ const char *name = "unknown sym bind name";
+ if (bind < ARRAY_SIZE(bind_name)) {
+ name = bind_name[bind];
+ }
+ return name;
+}
+
+static const char *sym_visibility(unsigned visibility)
+{
+ static const char *visibility_name[] = {
+#define SYM_VISIBILITY(X) [X] = #X
+ SYM_VISIBILITY(STV_DEFAULT),
+ SYM_VISIBILITY(STV_INTERNAL),
+ SYM_VISIBILITY(STV_HIDDEN),
+ SYM_VISIBILITY(STV_PROTECTED),
+#undef SYM_VISIBILITY
+ };
+ const char *name = "unknown sym visibility name";
+ if (visibility < ARRAY_SIZE(visibility_name)) {
+ name = visibility_name[visibility];
+ }
+ return name;
+}
+
+static const char *rel_type(unsigned type)
+{
+ static const char *type_name[] = {
+#define REL_TYPE(X) [X] = #X
+#if ELF_BITS == 64
+ REL_TYPE(R_X86_64_NONE),
+ REL_TYPE(R_X86_64_64),
+ REL_TYPE(R_X86_64_PC64),
+ REL_TYPE(R_X86_64_PC32),
+ REL_TYPE(R_X86_64_GOT32),
+ REL_TYPE(R_X86_64_PLT32),
+ REL_TYPE(R_X86_64_COPY),
+ REL_TYPE(R_X86_64_GLOB_DAT),
+ REL_TYPE(R_X86_64_JUMP_SLOT),
+ REL_TYPE(R_X86_64_RELATIVE),
+ REL_TYPE(R_X86_64_GOTPCREL),
+ REL_TYPE(R_X86_64_32),
+ REL_TYPE(R_X86_64_32S),
+ REL_TYPE(R_X86_64_16),
+ REL_TYPE(R_X86_64_PC16),
+ REL_TYPE(R_X86_64_8),
+ REL_TYPE(R_X86_64_PC8),
+#else
+ REL_TYPE(R_386_NONE),
+ REL_TYPE(R_386_32),
+ REL_TYPE(R_386_PC32),
+ REL_TYPE(R_386_GOT32),
+ REL_TYPE(R_386_PLT32),
+ REL_TYPE(R_386_COPY),
+ REL_TYPE(R_386_GLOB_DAT),
+ REL_TYPE(R_386_JMP_SLOT),
+ REL_TYPE(R_386_RELATIVE),
+ REL_TYPE(R_386_GOTOFF),
+ REL_TYPE(R_386_GOTPC),
+ REL_TYPE(R_386_8),
+ REL_TYPE(R_386_PC8),
+ REL_TYPE(R_386_16),
+ REL_TYPE(R_386_PC16),
+#endif
+#undef REL_TYPE
+ };
+ const char *name = "unknown type rel type name";
+ if (type < ARRAY_SIZE(type_name) && type_name[type]) {
+ name = type_name[type];
+ }
+ return name;
+}
+
+static const char *sec_name(unsigned shndx)
+{
+ const char *sec_strtab;
+ const char *name;
+ sec_strtab = secs[shstrndx].strtab;
+ name = "<noname>";
+ if (shndx < shnum) {
+ name = sec_strtab + secs[shndx].shdr.sh_name;
+ }
+ else if (shndx == SHN_ABS) {
+ name = "ABSOLUTE";
+ }
+ else if (shndx == SHN_COMMON) {
+ name = "COMMON";
+ }
+ return name;
+}
+
+static const char *sym_name(const char *sym_strtab, Elf_Sym *sym)
+{
+ const char *name;
+ name = "<noname>";
+ if (sym->st_name) {
+ name = sym_strtab + sym->st_name;
+ }
+ else {
+ name = sec_name(sym_index(sym));
+ }
+ return name;
+}
+
+static Elf_Sym *sym_lookup(const char *symname)
+{
+ int i;
+ for (i = 0; i < shnum; i++) {
+ struct section *sec = &secs[i];
+ long nsyms;
+ char *strtab;
+ Elf_Sym *symtab;
+ Elf_Sym *sym;
+
+ if (sec->shdr.sh_type != SHT_SYMTAB)
+ continue;
+
+ nsyms = sec->shdr.sh_size/sizeof(Elf_Sym);
+ symtab = sec->symtab;
+ strtab = sec->link->strtab;
+
+ for (sym = symtab; --nsyms >= 0; sym++) {
+ if (!sym->st_name)
+ continue;
+ if (strcmp(symname, strtab + sym->st_name) == 0)
+ return sym;
+ }
+ }
+ return 0;
+}
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define le16_to_cpu(val) (val)
+#define le32_to_cpu(val) (val)
+#define le64_to_cpu(val) (val)
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+#define le16_to_cpu(val) bswap_16(val)
+#define le32_to_cpu(val) bswap_32(val)
+#define le64_to_cpu(val) bswap_64(val)
+#endif
+
+static uint16_t elf16_to_cpu(uint16_t val)
+{
+ return le16_to_cpu(val);
+}
+
+static uint32_t elf32_to_cpu(uint32_t val)
+{
+ return le32_to_cpu(val);
+}
+
+#define elf_half_to_cpu(x) elf16_to_cpu(x)
+#define elf_word_to_cpu(x) elf32_to_cpu(x)
+
+#if ELF_BITS == 64
+static uint64_t elf64_to_cpu(uint64_t val)
+{
+ return le64_to_cpu(val);
+}
+#define elf_addr_to_cpu(x) elf64_to_cpu(x)
+#define elf_off_to_cpu(x) elf64_to_cpu(x)
+#define elf_xword_to_cpu(x) elf64_to_cpu(x)
+#else
+#define elf_addr_to_cpu(x) elf32_to_cpu(x)
+#define elf_off_to_cpu(x) elf32_to_cpu(x)
+#define elf_xword_to_cpu(x) elf32_to_cpu(x)
+#endif
+
+static int sym_index(Elf_Sym *sym)
+{
+ Elf_Sym *symtab = secs[shsymtabndx].symtab;
+ Elf32_Word *xsymtab = secs[shxsymtabndx].xsymtab;
+ unsigned long offset;
+ int index;
+
+ if (sym->st_shndx != SHN_XINDEX)
+ return sym->st_shndx;
+
+ /* calculate offset of sym from head of table. */
+ offset = (unsigned long)sym - (unsigned long)symtab;
+ index = offset / sizeof(*sym);
+
+ return elf32_to_cpu(xsymtab[index]);
+}
+
+static void read_ehdr(FILE *fp)
+{
+ if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
+ die("Cannot read ELF header: %s\n",
+ strerror(errno));
+ }
+ if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
+ die("No ELF magic\n");
+ }
+ if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) {
+ die("Not a %d bit executable\n", ELF_BITS);
+ }
+ if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
+ die("Not a LSB ELF executable\n");
+ }
+ if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
+ die("Unknown ELF version\n");
+ }
+ /* Convert the fields to native endian */
+ ehdr.e_type = elf_half_to_cpu(ehdr.e_type);
+ ehdr.e_machine = elf_half_to_cpu(ehdr.e_machine);
+ ehdr.e_version = elf_word_to_cpu(ehdr.e_version);
+ ehdr.e_entry = elf_addr_to_cpu(ehdr.e_entry);
+ ehdr.e_phoff = elf_off_to_cpu(ehdr.e_phoff);
+ ehdr.e_shoff = elf_off_to_cpu(ehdr.e_shoff);
+ ehdr.e_flags = elf_word_to_cpu(ehdr.e_flags);
+ ehdr.e_ehsize = elf_half_to_cpu(ehdr.e_ehsize);
+ ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
+ ehdr.e_phnum = elf_half_to_cpu(ehdr.e_phnum);
+ ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
+ ehdr.e_shnum = elf_half_to_cpu(ehdr.e_shnum);
+ ehdr.e_shstrndx = elf_half_to_cpu(ehdr.e_shstrndx);
+
+ shnum = ehdr.e_shnum;
+ shstrndx = ehdr.e_shstrndx;
+
+ if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN))
+ die("Unsupported ELF header type\n");
+ if (ehdr.e_machine != ELF_MACHINE)
+ die("Not for %s\n", ELF_MACHINE_NAME);
+ if (ehdr.e_version != EV_CURRENT)
+ die("Unknown ELF version\n");
+ if (ehdr.e_ehsize != sizeof(Elf_Ehdr))
+ die("Bad Elf header size\n");
+ if (ehdr.e_phentsize != sizeof(Elf_Phdr))
+ die("Bad program header entry\n");
+ if (ehdr.e_shentsize != sizeof(Elf_Shdr))
+ die("Bad section header entry\n");
+
+
+ if (shnum == SHN_UNDEF || shstrndx == SHN_XINDEX) {
+ Elf_Shdr shdr;
+
+ if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0)
+ die("Seek to %" FMT " failed: %s\n", ehdr.e_shoff, strerror(errno));
+
+ if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
+ die("Cannot read initial ELF section header: %s\n", strerror(errno));
+
+ if (shnum == SHN_UNDEF)
+ shnum = elf_xword_to_cpu(shdr.sh_size);
+
+ if (shstrndx == SHN_XINDEX)
+ shstrndx = elf_word_to_cpu(shdr.sh_link);
+ }
+
+ if (shstrndx >= shnum)
+ die("String table index out of bounds\n");
+}
+
+static void read_shdrs(FILE *fp)
+{
+ int i;
+ Elf_Shdr shdr;
+
+ secs = calloc(shnum, sizeof(struct section));
+ if (!secs) {
+ die("Unable to allocate %ld section headers\n",
+ shnum);
+ }
+ if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
+ die("Seek to %" FMT " failed: %s\n",
+ ehdr.e_shoff, strerror(errno));
+ }
+ for (i = 0; i < shnum; i++) {
+ struct section *sec = &secs[i];
+ if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
+ die("Cannot read ELF section headers %d/%ld: %s\n",
+ i, shnum, strerror(errno));
+ sec->shdr.sh_name = elf_word_to_cpu(shdr.sh_name);
+ sec->shdr.sh_type = elf_word_to_cpu(shdr.sh_type);
+ sec->shdr.sh_flags = elf_xword_to_cpu(shdr.sh_flags);
+ sec->shdr.sh_addr = elf_addr_to_cpu(shdr.sh_addr);
+ sec->shdr.sh_offset = elf_off_to_cpu(shdr.sh_offset);
+ sec->shdr.sh_size = elf_xword_to_cpu(shdr.sh_size);
+ sec->shdr.sh_link = elf_word_to_cpu(shdr.sh_link);
+ sec->shdr.sh_info = elf_word_to_cpu(shdr.sh_info);
+ sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
+ sec->shdr.sh_entsize = elf_xword_to_cpu(shdr.sh_entsize);
+ if (sec->shdr.sh_link < shnum)
+ sec->link = &secs[sec->shdr.sh_link];
+ }
+
+}
+
+static void read_strtabs(FILE *fp)
+{
+ int i;
+ for (i = 0; i < shnum; i++) {
+ struct section *sec = &secs[i];
+ if (sec->shdr.sh_type != SHT_STRTAB) {
+ continue;
+ }
+ sec->strtab = malloc(sec->shdr.sh_size);
+ if (!sec->strtab) {
+ die("malloc of %" FMT " bytes for strtab failed\n",
+ sec->shdr.sh_size);
+ }
+ if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
+ die("Seek to %" FMT " failed: %s\n",
+ sec->shdr.sh_offset, strerror(errno));
+ }
+ if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
+ != sec->shdr.sh_size) {
+ die("Cannot read symbol table: %s\n",
+ strerror(errno));
+ }
+ }
+}
+
+static void read_symtabs(FILE *fp)
+{
+ int i,j;
+
+ for (i = 0; i < shnum; i++) {
+ struct section *sec = &secs[i];
+ int num_syms;
+
+ switch (sec->shdr.sh_type) {
+ case SHT_SYMTAB_SHNDX:
+ sec->xsymtab = malloc(sec->shdr.sh_size);
+ if (!sec->xsymtab) {
+ die("malloc of %" FMT " bytes for xsymtab failed\n",
+ sec->shdr.sh_size);
+ }
+ if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
+ die("Seek to %" FMT " failed: %s\n",
+ sec->shdr.sh_offset, strerror(errno));
+ }
+ if (fread(sec->xsymtab, 1, sec->shdr.sh_size, fp)
+ != sec->shdr.sh_size) {
+ die("Cannot read extended symbol table: %s\n",
+ strerror(errno));
+ }
+ shxsymtabndx = i;
+ continue;
+
+ case SHT_SYMTAB:
+ num_syms = sec->shdr.sh_size / sizeof(Elf_Sym);
+
+ sec->symtab = malloc(sec->shdr.sh_size);
+ if (!sec->symtab) {
+ die("malloc of %" FMT " bytes for symtab failed\n",
+ sec->shdr.sh_size);
+ }
+ if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
+ die("Seek to %" FMT " failed: %s\n",
+ sec->shdr.sh_offset, strerror(errno));
+ }
+ if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
+ != sec->shdr.sh_size) {
+ die("Cannot read symbol table: %s\n",
+ strerror(errno));
+ }
+ for (j = 0; j < num_syms; j++) {
+ Elf_Sym *sym = &sec->symtab[j];
+
+ sym->st_name = elf_word_to_cpu(sym->st_name);
+ sym->st_value = elf_addr_to_cpu(sym->st_value);
+ sym->st_size = elf_xword_to_cpu(sym->st_size);
+ sym->st_shndx = elf_half_to_cpu(sym->st_shndx);
+ }
+ shsymtabndx = i;
+ continue;
+
+ default:
+ continue;
+ }
+ }
+}
+
+
+static void read_relocs(FILE *fp)
+{
+ int i,j;
+ for (i = 0; i < shnum; i++) {
+ struct section *sec = &secs[i];
+ if (sec->shdr.sh_type != SHT_REL_TYPE) {
+ continue;
+ }
+ sec->reltab = malloc(sec->shdr.sh_size);
+ if (!sec->reltab) {
+ die("malloc of %" FMT " bytes for relocs failed\n",
+ sec->shdr.sh_size);
+ }
+ if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
+ die("Seek to %" FMT " failed: %s\n",
+ sec->shdr.sh_offset, strerror(errno));
+ }
+ if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
+ != sec->shdr.sh_size) {
+ die("Cannot read symbol table: %s\n",
+ strerror(errno));
+ }
+ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
+ Elf_Rel *rel = &sec->reltab[j];
+ rel->r_offset = elf_addr_to_cpu(rel->r_offset);
+ rel->r_info = elf_xword_to_cpu(rel->r_info);
+#if (SHT_REL_TYPE == SHT_RELA)
+ rel->r_addend = elf_xword_to_cpu(rel->r_addend);
+#endif
+ }
+ }
+}
+
+
+static void print_absolute_symbols(void)
+{
+ int i;
+ const char *format;
+
+ if (ELF_BITS == 64)
+ format = "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s\n";
+ else
+ format = "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n";
+
+ printf("Absolute symbols\n");
+ printf(" Num: Value Size Type Bind Visibility Name\n");
+ for (i = 0; i < shnum; i++) {
+ struct section *sec = &secs[i];
+ char *sym_strtab;
+ int j;
+
+ if (sec->shdr.sh_type != SHT_SYMTAB) {
+ continue;
+ }
+ sym_strtab = sec->link->strtab;
+ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
+ Elf_Sym *sym;
+ const char *name;
+ sym = &sec->symtab[j];
+ name = sym_name(sym_strtab, sym);
+ if (sym->st_shndx != SHN_ABS) {
+ continue;
+ }
+ printf(format,
+ j, sym->st_value, sym->st_size,
+ sym_type(ELF_ST_TYPE(sym->st_info)),
+ sym_bind(ELF_ST_BIND(sym->st_info)),
+ sym_visibility(ELF_ST_VISIBILITY(sym->st_other)),
+ name);
+ }
+ }
+ printf("\n");
+}
+
+static void print_absolute_relocs(void)
+{
+ int i, printed = 0;
+ const char *format;
+
+ if (ELF_BITS == 64)
+ format = "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64" %s\n";
+ else
+ format = "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n";
+
+ for (i = 0; i < shnum; i++) {
+ struct section *sec = &secs[i];
+ struct section *sec_applies, *sec_symtab;
+ char *sym_strtab;
+ Elf_Sym *sh_symtab;
+ int j;
+ if (sec->shdr.sh_type != SHT_REL_TYPE) {
+ continue;
+ }
+ sec_symtab = sec->link;
+ sec_applies = &secs[sec->shdr.sh_info];
+ if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
+ continue;
+ }
+ sh_symtab = sec_symtab->symtab;
+ sym_strtab = sec_symtab->link->strtab;
+ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
+ Elf_Rel *rel;
+ Elf_Sym *sym;
+ const char *name;
+ rel = &sec->reltab[j];
+ sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
+ name = sym_name(sym_strtab, sym);
+ if (sym->st_shndx != SHN_ABS) {
+ continue;
+ }
+
+ /* Absolute symbols are not relocated if bzImage is
+ * loaded at a non-compiled address. Display a warning
+ * to user at compile time about the absolute
+ * relocations present.
+ *
+ * User need to audit the code to make sure
+ * some symbols which should have been section
+ * relative have not become absolute because of some
+ * linker optimization or wrong programming usage.
+ *
+ * Before warning check if this absolute symbol
+ * relocation is harmless.
+ */
+ if (is_reloc(S_ABS, name) || is_reloc(S_REL, name))
+ continue;
+
+ if (!printed) {
+ printf("WARNING: Absolute relocations"
+ " present\n");
+ printf("Offset Info Type Sym.Value "
+ "Sym.Name\n");
+ printed = 1;
+ }
+
+ printf(format,
+ rel->r_offset,
+ rel->r_info,
+ rel_type(ELF_R_TYPE(rel->r_info)),
+ sym->st_value,
+ name);
+ }
+ }
+
+ if (printed)
+ printf("\n");
+}
+
+static void add_reloc(struct relocs *r, uint32_t offset)
+{
+ if (r->count == r->size) {
+ unsigned long newsize = r->size + 50000;
+ void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
+
+ if (!mem)
+ die("realloc of %ld entries for relocs failed\n",
+ newsize);
+ r->offset = mem;
+ r->size = newsize;
+ }
+ r->offset[r->count++] = offset;
+}
+
+static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
+ Elf_Sym *sym, const char *symname))
+{
+ int i;
+ /* Walk through the relocations */
+ for (i = 0; i < shnum; i++) {
+ char *sym_strtab;
+ Elf_Sym *sh_symtab;
+ struct section *sec_applies, *sec_symtab;
+ int j;
+ struct section *sec = &secs[i];
+
+ if (sec->shdr.sh_type != SHT_REL_TYPE) {
+ continue;
+ }
+ sec_symtab = sec->link;
+ sec_applies = &secs[sec->shdr.sh_info];
+ if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
+ continue;
+ }
+ sh_symtab = sec_symtab->symtab;
+ sym_strtab = sec_symtab->link->strtab;
+ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
+ Elf_Rel *rel = &sec->reltab[j];
+ Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
+ const char *symname = sym_name(sym_strtab, sym);
+
+ process(sec, rel, sym, symname);
+ }
+ }
+}
+
+/*
+ * The .data..percpu section is a special case for x86_64 SMP kernels.
+ * It is used to initialize the actual per_cpu areas and to provide
+ * definitions for the per_cpu variables that correspond to their offsets
+ * within the percpu area. Since the values of all of the symbols need
+ * to be offsets from the start of the per_cpu area the virtual address
+ * (sh_addr) of .data..percpu is 0 in SMP kernels.
+ *
+ * This means that:
+ *
+ * Relocations that reference symbols in the per_cpu area do not
+ * need further relocation (since the value is an offset relative
+ * to the start of the per_cpu area that does not change).
+ *
+ * Relocations that apply to the per_cpu area need to have their
+ * offset adjusted by by the value of __per_cpu_load to make them
+ * point to the correct place in the loaded image (because the
+ * virtual address of .data..percpu is 0).
+ *
+ * For non SMP kernels .data..percpu is linked as part of the normal
+ * kernel data and does not require special treatment.
+ *
+ */
+static int per_cpu_shndx = -1;
+static Elf_Addr per_cpu_load_addr;
+
+static void percpu_init(void)
+{
+ int i;
+ for (i = 0; i < shnum; i++) {
+ ElfW(Sym) *sym;
+ if (strcmp(sec_name(i), ".data..percpu"))
+ continue;
+
+ if (secs[i].shdr.sh_addr != 0) /* non SMP kernel */
+ return;
+
+ sym = sym_lookup("__per_cpu_load");
+ if (!sym)
+ die("can't find __per_cpu_load\n");
+
+ per_cpu_shndx = i;
+ per_cpu_load_addr = sym->st_value;
+ return;
+ }
+}
+
+#if ELF_BITS == 64
+
+/*
+ * Check to see if a symbol lies in the .data..percpu section.
+ *
+ * The linker incorrectly associates some symbols with the
+ * .data..percpu section so we also need to check the symbol
+ * name to make sure that we classify the symbol correctly.
+ *
+ * The GNU linker incorrectly associates:
+ * __init_begin
+ * __per_cpu_load
+ *
+ * The "gold" linker incorrectly associates:
+ * init_per_cpu__fixed_percpu_data
+ * init_per_cpu__gdt_page
+ */
+static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
+{
+ int shndx = sym_index(sym);
+
+ return (shndx == per_cpu_shndx) &&
+ strcmp(symname, "__init_begin") &&
+ strcmp(symname, "__per_cpu_load") &&
+ strncmp(symname, "init_per_cpu_", 13);
+}
+
+
+static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
+ const char *symname)
+{
+ unsigned r_type = ELF64_R_TYPE(rel->r_info);
+ ElfW(Addr) offset = rel->r_offset;
+ int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
+
+ if (sym->st_shndx == SHN_UNDEF)
+ return 0;
+
+ /*
+ * Adjust the offset if this reloc applies to the percpu section.
+ */
+ if (sec->shdr.sh_info == per_cpu_shndx)
+ offset += per_cpu_load_addr;
+
+ switch (r_type) {
+ case R_X86_64_NONE:
+ /* NONE can be ignored. */
+ break;
+
+ case R_X86_64_PC32:
+ case R_X86_64_PLT32:
+ /*
+ * PC relative relocations don't need to be adjusted unless
+ * referencing a percpu symbol.
+ *
+ * NB: R_X86_64_PLT32 can be treated as R_X86_64_PC32.
+ */
+ if (is_percpu_sym(sym, symname))
+ add_reloc(&relocs32neg, offset);
+ break;
+
+ case R_X86_64_PC64:
+ /*
+ * Only used by jump labels
+ */
+ if (is_percpu_sym(sym, symname))
+ die("Invalid R_X86_64_PC64 relocation against per-CPU symbol %s\n",
+ symname);
+ break;
+
+ case R_X86_64_32:
+ case R_X86_64_32S:
+ case R_X86_64_64:
+ /*
+ * References to the percpu area don't need to be adjusted.
+ */
+ if (is_percpu_sym(sym, symname))
+ break;
+
+ if (shn_abs) {
+ /*
+ * Whitelisted absolute symbols do not require
+ * relocation.
+ */
+ if (is_reloc(S_ABS, symname))
+ break;
+
+ die("Invalid absolute %s relocation: %s\n",
+ rel_type(r_type), symname);
+ break;
+ }
+
+ /*
+ * Relocation offsets for 64 bit kernels are output
+ * as 32 bits and sign extended back to 64 bits when
+ * the relocations are processed.
+ * Make sure that the offset will fit.
+ */
+ if ((int32_t)offset != (int64_t)offset)
+ die("Relocation offset doesn't fit in 32 bits\n");
+
+ if (r_type == R_X86_64_64)
+ add_reloc(&relocs64, offset);
+ else
+ add_reloc(&relocs32, offset);
+ break;
+
+ default:
+ die("Unsupported relocation type: %s (%d)\n",
+ rel_type(r_type), r_type);
+ break;
+ }
+
+ return 0;
+}
+
+#else
+
+static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
+ const char *symname)
+{
+ unsigned r_type = ELF32_R_TYPE(rel->r_info);
+ int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
+
+ switch (r_type) {
+ case R_386_NONE:
+ case R_386_PC32:
+ case R_386_PC16:
+ case R_386_PC8:
+ case R_386_PLT32:
+ /*
+ * NONE can be ignored and PC relative relocations don't need
+ * to be adjusted. Because sym must be defined, R_386_PLT32 can
+ * be treated the same way as R_386_PC32.
+ */
+ break;
+
+ case R_386_32:
+ if (shn_abs) {
+ /*
+ * Whitelisted absolute symbols do not require
+ * relocation.
+ */
+ if (is_reloc(S_ABS, symname))
+ break;
+
+ die("Invalid absolute %s relocation: %s\n",
+ rel_type(r_type), symname);
+ break;
+ }
+
+ add_reloc(&relocs32, rel->r_offset);
+ break;
+
+ default:
+ die("Unsupported relocation type: %s (%d)\n",
+ rel_type(r_type), r_type);
+ break;
+ }
+
+ return 0;
+}
+
+static int do_reloc_real(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
+ const char *symname)
+{
+ unsigned r_type = ELF32_R_TYPE(rel->r_info);
+ int shn_abs = (sym->st_shndx == SHN_ABS) && !is_reloc(S_REL, symname);
+
+ switch (r_type) {
+ case R_386_NONE:
+ case R_386_PC32:
+ case R_386_PC16:
+ case R_386_PC8:
+ case R_386_PLT32:
+ /*
+ * NONE can be ignored and PC relative relocations don't need
+ * to be adjusted. Because sym must be defined, R_386_PLT32 can
+ * be treated the same way as R_386_PC32.
+ */
+ break;
+
+ case R_386_16:
+ if (shn_abs) {
+ /*
+ * Whitelisted absolute symbols do not require
+ * relocation.
+ */
+ if (is_reloc(S_ABS, symname))
+ break;
+
+ if (is_reloc(S_SEG, symname)) {
+ add_reloc(&relocs16, rel->r_offset);
+ break;
+ }
+ } else {
+ if (!is_reloc(S_LIN, symname))
+ break;
+ }
+ die("Invalid %s %s relocation: %s\n",
+ shn_abs ? "absolute" : "relative",
+ rel_type(r_type), symname);
+ break;
+
+ case R_386_32:
+ if (shn_abs) {
+ /*
+ * Whitelisted absolute symbols do not require
+ * relocation.
+ */
+ if (is_reloc(S_ABS, symname))
+ break;
+
+ if (is_reloc(S_REL, symname)) {
+ add_reloc(&relocs32, rel->r_offset);
+ break;
+ }
+ } else {
+ if (is_reloc(S_LIN, symname))
+ add_reloc(&relocs32, rel->r_offset);
+ break;
+ }
+ die("Invalid %s %s relocation: %s\n",
+ shn_abs ? "absolute" : "relative",
+ rel_type(r_type), symname);
+ break;
+
+ default:
+ die("Unsupported relocation type: %s (%d)\n",
+ rel_type(r_type), r_type);
+ break;
+ }
+
+ return 0;
+}
+
+#endif
+
+static int cmp_relocs(const void *va, const void *vb)
+{
+ const uint32_t *a, *b;
+ a = va; b = vb;
+ return (*a == *b)? 0 : (*a > *b)? 1 : -1;
+}
+
+static void sort_relocs(struct relocs *r)
+{
+ qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
+}
+
+static int write32(uint32_t v, FILE *f)
+{
+ unsigned char buf[4];
+
+ put_unaligned_le32(v, buf);
+ return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
+}
+
+static int write32_as_text(uint32_t v, FILE *f)
+{
+ return fprintf(f, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0 : -1;
+}
+
+static void emit_relocs(int as_text, int use_real_mode)
+{
+ int i;
+ int (*write_reloc)(uint32_t, FILE *) = write32;
+ int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
+ const char *symname);
+
+#if ELF_BITS == 64
+ if (!use_real_mode)
+ do_reloc = do_reloc64;
+ else
+ die("--realmode not valid for a 64-bit ELF file");
+#else
+ if (!use_real_mode)
+ do_reloc = do_reloc32;
+ else
+ do_reloc = do_reloc_real;
+#endif
+
+ /* Collect up the relocations */
+ walk_relocs(do_reloc);
+
+ if (relocs16.count && !use_real_mode)
+ die("Segment relocations found but --realmode not specified\n");
+
+ /* Order the relocations for more efficient processing */
+ sort_relocs(&relocs32);
+#if ELF_BITS == 64
+ sort_relocs(&relocs32neg);
+ sort_relocs(&relocs64);
+#else
+ sort_relocs(&relocs16);
+#endif
+
+ /* Print the relocations */
+ if (as_text) {
+ /* Print the relocations in a form suitable that
+ * gas will like.
+ */
+ printf(".section \".data.reloc\",\"a\"\n");
+ printf(".balign 4\n");
+ write_reloc = write32_as_text;
+ }
+
+ if (use_real_mode) {
+ write_reloc(relocs16.count, stdout);
+ for (i = 0; i < relocs16.count; i++)
+ write_reloc(relocs16.offset[i], stdout);
+
+ write_reloc(relocs32.count, stdout);
+ for (i = 0; i < relocs32.count; i++)
+ write_reloc(relocs32.offset[i], stdout);
+ } else {
+#if ELF_BITS == 64
+ /* Print a stop */
+ write_reloc(0, stdout);
+
+ /* Now print each relocation */
+ for (i = 0; i < relocs64.count; i++)
+ write_reloc(relocs64.offset[i], stdout);
+
+ /* Print a stop */
+ write_reloc(0, stdout);
+
+ /* Now print each inverse 32-bit relocation */
+ for (i = 0; i < relocs32neg.count; i++)
+ write_reloc(relocs32neg.offset[i], stdout);
+#endif
+
+ /* Print a stop */
+ write_reloc(0, stdout);
+
+ /* Now print each relocation */
+ for (i = 0; i < relocs32.count; i++)
+ write_reloc(relocs32.offset[i], stdout);
+ }
+}
+
+/*
+ * As an aid to debugging problems with different linkers
+ * print summary information about the relocs.
+ * Since different linkers tend to emit the sections in
+ * different orders we use the section names in the output.
+ */
+static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
+ const char *symname)
+{
+ printf("%s\t%s\t%s\t%s\n",
+ sec_name(sec->shdr.sh_info),
+ rel_type(ELF_R_TYPE(rel->r_info)),
+ symname,
+ sec_name(sym_index(sym)));
+ return 0;
+}
+
+static void print_reloc_info(void)
+{
+ printf("reloc section\treloc type\tsymbol\tsymbol section\n");
+ walk_relocs(do_reloc_info);
+}
+
+#if ELF_BITS == 64
+# define process process_64
+#else
+# define process process_32
+#endif
+
+void process(FILE *fp, int use_real_mode, int as_text,
+ int show_absolute_syms, int show_absolute_relocs,
+ int show_reloc_info)
+{
+ regex_init(use_real_mode);
+ read_ehdr(fp);
+ read_shdrs(fp);
+ read_strtabs(fp);
+ read_symtabs(fp);
+ read_relocs(fp);
+ if (ELF_BITS == 64)
+ percpu_init();
+ if (show_absolute_syms) {
+ print_absolute_symbols();
+ return;
+ }
+ if (show_absolute_relocs) {
+ print_absolute_relocs();
+ return;
+ }
+ if (show_reloc_info) {
+ print_reloc_info();
+ return;
+ }
+ emit_relocs(as_text, use_real_mode);
+}
diff --git a/arch/x86/tools/relocs.h b/arch/x86/tools/relocs.h
new file mode 100644
index 000000000..4c49c8244
--- /dev/null
+++ b/arch/x86/tools/relocs.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef RELOCS_H
+#define RELOCS_H
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <elf.h>
+#include <byteswap.h>
+#define USE_BSD
+#include <endian.h>
+#include <regex.h>
+#include <tools/le_byteshift.h>
+
+__attribute__((__format__(printf, 1, 2)))
+void die(char *fmt, ...) __attribute__((noreturn));
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+enum symtype {
+ S_ABS,
+ S_REL,
+ S_SEG,
+ S_LIN,
+ S_NSYMTYPES
+};
+
+void process_32(FILE *fp, int use_real_mode, int as_text,
+ int show_absolute_syms, int show_absolute_relocs,
+ int show_reloc_info);
+void process_64(FILE *fp, int use_real_mode, int as_text,
+ int show_absolute_syms, int show_absolute_relocs,
+ int show_reloc_info);
+#endif /* RELOCS_H */
diff --git a/arch/x86/tools/relocs_32.c b/arch/x86/tools/relocs_32.c
new file mode 100644
index 000000000..9442ff78b
--- /dev/null
+++ b/arch/x86/tools/relocs_32.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "relocs.h"
+
+#define ELF_BITS 32
+
+#define ELF_MACHINE EM_386
+#define ELF_MACHINE_NAME "i386"
+#define SHT_REL_TYPE SHT_REL
+#define Elf_Rel ElfW(Rel)
+
+#define ELF_CLASS ELFCLASS32
+#define ELF_R_SYM(val) ELF32_R_SYM(val)
+#define ELF_R_TYPE(val) ELF32_R_TYPE(val)
+#define ELF_ST_TYPE(o) ELF32_ST_TYPE(o)
+#define ELF_ST_BIND(o) ELF32_ST_BIND(o)
+#define ELF_ST_VISIBILITY(o) ELF32_ST_VISIBILITY(o)
+
+#include "relocs.c"
diff --git a/arch/x86/tools/relocs_64.c b/arch/x86/tools/relocs_64.c
new file mode 100644
index 000000000..9029cb619
--- /dev/null
+++ b/arch/x86/tools/relocs_64.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "relocs.h"
+
+#define ELF_BITS 64
+
+#define ELF_MACHINE EM_X86_64
+#define ELF_MACHINE_NAME "x86_64"
+#define SHT_REL_TYPE SHT_RELA
+#define Elf_Rel Elf64_Rela
+
+#define ELF_CLASS ELFCLASS64
+#define ELF_R_SYM(val) ELF64_R_SYM(val)
+#define ELF_R_TYPE(val) ELF64_R_TYPE(val)
+#define ELF_ST_TYPE(o) ELF64_ST_TYPE(o)
+#define ELF_ST_BIND(o) ELF64_ST_BIND(o)
+#define ELF_ST_VISIBILITY(o) ELF64_ST_VISIBILITY(o)
+
+#include "relocs.c"
diff --git a/arch/x86/tools/relocs_common.c b/arch/x86/tools/relocs_common.c
new file mode 100644
index 000000000..6634352a2
--- /dev/null
+++ b/arch/x86/tools/relocs_common.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "relocs.h"
+
+void die(char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ exit(1);
+}
+
+static void usage(void)
+{
+ die("relocs [--abs-syms|--abs-relocs|--reloc-info|--text|--realmode]" \
+ " vmlinux\n");
+}
+
+int main(int argc, char **argv)
+{
+ int show_absolute_syms, show_absolute_relocs, show_reloc_info;
+ int as_text, use_real_mode;
+ const char *fname;
+ FILE *fp;
+ int i;
+ unsigned char e_ident[EI_NIDENT];
+
+ show_absolute_syms = 0;
+ show_absolute_relocs = 0;
+ show_reloc_info = 0;
+ as_text = 0;
+ use_real_mode = 0;
+ fname = NULL;
+ for (i = 1; i < argc; i++) {
+ char *arg = argv[i];
+ if (*arg == '-') {
+ if (strcmp(arg, "--abs-syms") == 0) {
+ show_absolute_syms = 1;
+ continue;
+ }
+ if (strcmp(arg, "--abs-relocs") == 0) {
+ show_absolute_relocs = 1;
+ continue;
+ }
+ if (strcmp(arg, "--reloc-info") == 0) {
+ show_reloc_info = 1;
+ continue;
+ }
+ if (strcmp(arg, "--text") == 0) {
+ as_text = 1;
+ continue;
+ }
+ if (strcmp(arg, "--realmode") == 0) {
+ use_real_mode = 1;
+ continue;
+ }
+ }
+ else if (!fname) {
+ fname = arg;
+ continue;
+ }
+ usage();
+ }
+ if (!fname) {
+ usage();
+ }
+ fp = fopen(fname, "r");
+ if (!fp) {
+ die("Cannot open %s: %s\n", fname, strerror(errno));
+ }
+ if (fread(&e_ident, 1, EI_NIDENT, fp) != EI_NIDENT) {
+ die("Cannot read %s: %s", fname, strerror(errno));
+ }
+ rewind(fp);
+ if (e_ident[EI_CLASS] == ELFCLASS64)
+ process_64(fp, use_real_mode, as_text,
+ show_absolute_syms, show_absolute_relocs,
+ show_reloc_info);
+ else
+ process_32(fp, use_real_mode, as_text,
+ show_absolute_syms, show_absolute_relocs,
+ show_reloc_info);
+ fclose(fp);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 20:45:28 +0000