diff options
Diffstat (limited to 'src/VBox/Disassembler/DisasmMisc.cpp')
| -rw-r--r-- | src/VBox/Disassembler/DisasmMisc.cpp | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/src/VBox/Disassembler/DisasmMisc.cpp b/src/VBox/Disassembler/DisasmMisc.cpp new file mode 100644 index 00000000..16d90e8d --- /dev/null +++ b/src/VBox/Disassembler/DisasmMisc.cpp @@ -0,0 +1,175 @@ +/* $Id: DisasmMisc.cpp $ */ +/** @file + * VBox disassembler- Misc Helpers. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP LOG_GROUP_DIS +#include <VBox/dis.h> +#include <VBox/disopcode.h> +#include <iprt/errcore.h> +#include <VBox/log.h> +#include <VBox/vmm/cpum.h> +#include <iprt/assert.h> +#include <iprt/string.h> +#include <iprt/stdarg.h> +#include "DisasmInternal.h" + + +DISDECL(uint8_t) DISGetParamSize(PCDISSTATE pDis, PCDISOPPARAM pParam) +{ + unsigned subtype = OP_PARM_VSUBTYPE(pParam->fParam); + switch (subtype) + { + case OP_PARM_v: + switch (pDis->uOpMode) + { + case DISCPUMODE_32BIT: + return 4; + case DISCPUMODE_64BIT: + return 8; + case DISCPUMODE_16BIT: + return 2; + default: AssertFailed(); /* make gcc happy */ return 4; + } + break; + + case OP_PARM_b: + return 1; + + case OP_PARM_w: + return 2; + + case OP_PARM_d: + return 4; + + case OP_PARM_q: + return 8; + + case OP_PARM_dq: + return 16; + + case OP_PARM_qq: + return 32; + + case 0: /* nop, pause, lea, wrmsr, rdmsr, etc. Most of these due to DISOPPARAM::cb being initialized in the wrong place + (disParseInstruction) where it will be called on intermediate stuff like IDX_ParseTwoByteEsc. The parameter + parsers should do it instead, though I see the potential filtering issue. */ + //Assert( pDis->pCurInstr + // && ( pDis->pCurInstr->uOpcode == OP_NOP + // || pDis->pCurInstr->uOpcode == OP_LEA )); + return 0; + + case OP_PARM_p: /* far pointer */ + if (pDis->uAddrMode == DISCPUMODE_32BIT) + return 6; /* 16:32 */ + if (pDis->uAddrMode == DISCPUMODE_64BIT) + return 12; /* 16:64 */ + return 4; /* 16:16 */ + + case OP_PARM_s: /* lgdt, sgdt, lidt, sidt */ + return pDis->uCpuMode == DISCPUMODE_64BIT ? 2 + 8 : 2 + 4; + + case OP_PARM_a: + return pDis->uOpMode == DISCPUMODE_16BIT ? 2 + 2 : 4 + 4; + + case OP_PARM_pi: + return 8; + + case OP_PARM_sd: + case OP_PARM_ss: + return 16; + + case OP_PARM_x: + case OP_PARM_pd: + case OP_PARM_ps: + return VEXREG_IS256B(pDis->bVexDestReg) ? 32 : 16; //?? + + case OP_PARM_y: + return pDis->uOpMode == DISCPUMODE_64BIT ? 4 : 8; //?? + + case OP_PARM_z: + if (pParam->cb) + return pParam->cb; + return pDis->uOpMode == DISCPUMODE_16BIT ? 2 : 4; //?? + + default: + if (pParam->cb) + return pParam->cb; + /// @todo dangerous!!! + AssertMsgFailed(("subtype=%#x fParam=%#x fUse=%#RX64 op=%#x\n", subtype, pParam->fParam, pParam->fUse, + pDis->pCurInstr ? pDis->pCurInstr->uOpcode : 0)); + return 4; + } +} + +#if 0 /* currently unused */ +DISDECL(DISSELREG) DISDetectSegReg(PCDISSTATE pDis, PCDISOPPARAM pParam) +{ + if (pDis->fPrefix & DISPREFIX_SEG) + /* Use specified SEG: prefix. */ + return (DISSELREG)pDis->idxSegPrefix; + + /* Guess segment register by parameter type. */ + if (pParam->fUse & (DISUSE_REG_GEN32|DISUSE_REG_GEN64|DISUSE_REG_GEN16)) + { + AssertCompile(DISGREG_ESP == DISGREG_RSP); + AssertCompile(DISGREG_EBP == DISGREG_RBP); + AssertCompile(DISGREG_ESP == DISGREG_SP); + AssertCompile(DISGREG_EBP == DISGREG_BP); + if (pParam->Base.idxGenReg == DISGREG_ESP || pParam->Base.idxGenReg == DISGREG_EBP) + return DISSELREG_SS; + } + /* Default is use DS: for data access. */ + return DISSELREG_DS; +} + + +DISDECL(uint8_t) DISQuerySegPrefixByte(PCDISSTATE pDis) +{ + Assert(pDis->fPrefix & DISPREFIX_SEG); + switch (pDis->idxSegPrefix) + { + case DISSELREG_ES: + return 0x26; + case DISSELREG_CS: + return 0x2E; + case DISSELREG_SS: + return 0x36; + case DISSELREG_DS: + return 0x3E; + case DISSELREG_FS: + return 0x64; + case DISSELREG_GS: + return 0x65; + default: + AssertFailed(); + return 0; + } +} +#endif |