/* $Id: DisasmReg.cpp 97211 2022-10-18 14:43:03Z vboxsync $ */ /** @file * VBox disassembler- Register Info Helpers. */ /* * Copyright (C) 2006-2022 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 . * * SPDX-License-Identifier: GPL-3.0-only */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_DIS #include #include #include #include #include #include #include #include #include "DisasmInternal.h" /********************************************************************************************************************************* * Global Variables * *********************************************************************************************************************************/ /** * Array for accessing 64-bit general registers in VMMREGFRAME structure * by register's index from disasm. */ static const unsigned g_aReg64Index[] = { RT_OFFSETOF(CPUMCTXCORE, rax), /* DISGREG_RAX */ RT_OFFSETOF(CPUMCTXCORE, rcx), /* DISGREG_RCX */ RT_OFFSETOF(CPUMCTXCORE, rdx), /* DISGREG_RDX */ RT_OFFSETOF(CPUMCTXCORE, rbx), /* DISGREG_RBX */ RT_OFFSETOF(CPUMCTXCORE, rsp), /* DISGREG_RSP */ RT_OFFSETOF(CPUMCTXCORE, rbp), /* DISGREG_RBP */ RT_OFFSETOF(CPUMCTXCORE, rsi), /* DISGREG_RSI */ RT_OFFSETOF(CPUMCTXCORE, rdi), /* DISGREG_RDI */ RT_OFFSETOF(CPUMCTXCORE, r8), /* DISGREG_R8 */ RT_OFFSETOF(CPUMCTXCORE, r9), /* DISGREG_R9 */ RT_OFFSETOF(CPUMCTXCORE, r10), /* DISGREG_R10 */ RT_OFFSETOF(CPUMCTXCORE, r11), /* DISGREG_R11 */ RT_OFFSETOF(CPUMCTXCORE, r12), /* DISGREG_R12 */ RT_OFFSETOF(CPUMCTXCORE, r13), /* DISGREG_R13 */ RT_OFFSETOF(CPUMCTXCORE, r14), /* DISGREG_R14 */ RT_OFFSETOF(CPUMCTXCORE, r15) /* DISGREG_R15 */ }; /** * Macro for accessing 64-bit general purpose registers in CPUMCTXCORE structure. */ #define DIS_READ_REG64(p, idx) (*(uint64_t *)((char *)(p) + g_aReg64Index[idx])) #define DIS_WRITE_REG64(p, idx, val) (*(uint64_t *)((char *)(p) + g_aReg64Index[idx]) = val) #define DIS_PTR_REG64(p, idx) ( (uint64_t *)((char *)(p) + g_aReg64Index[idx])) /** * Array for accessing 32-bit general registers in VMMREGFRAME structure * by register's index from disasm. */ static const unsigned g_aReg32Index[] = { RT_OFFSETOF(CPUMCTXCORE, eax), /* DISGREG_EAX */ RT_OFFSETOF(CPUMCTXCORE, ecx), /* DISGREG_ECX */ RT_OFFSETOF(CPUMCTXCORE, edx), /* DISGREG_EDX */ RT_OFFSETOF(CPUMCTXCORE, ebx), /* DISGREG_EBX */ RT_OFFSETOF(CPUMCTXCORE, esp), /* DISGREG_ESP */ RT_OFFSETOF(CPUMCTXCORE, ebp), /* DISGREG_EBP */ RT_OFFSETOF(CPUMCTXCORE, esi), /* DISGREG_ESI */ RT_OFFSETOF(CPUMCTXCORE, edi), /* DISGREG_EDI */ RT_OFFSETOF(CPUMCTXCORE, r8), /* DISGREG_R8D */ RT_OFFSETOF(CPUMCTXCORE, r9), /* DISGREG_R9D */ RT_OFFSETOF(CPUMCTXCORE, r10), /* DISGREG_R1D */ RT_OFFSETOF(CPUMCTXCORE, r11), /* DISGREG_R11D */ RT_OFFSETOF(CPUMCTXCORE, r12), /* DISGREG_R12D */ RT_OFFSETOF(CPUMCTXCORE, r13), /* DISGREG_R13D */ RT_OFFSETOF(CPUMCTXCORE, r14), /* DISGREG_R14D */ RT_OFFSETOF(CPUMCTXCORE, r15) /* DISGREG_R15D */ }; /** * Macro for accessing 32-bit general purpose registers in CPUMCTXCORE structure. */ #define DIS_READ_REG32(p, idx) (*(uint32_t *)((char *)(p) + g_aReg32Index[idx])) /* From http://www.cs.cmu.edu/~fp/courses/15213-s06/misc/asm64-handout.pdf: * ``Perhaps unexpectedly, instructions that move or generate 32-bit register * values also set the upper 32 bits of the register to zero. Consequently * there is no need for an instruction movzlq.'' */ #define DIS_WRITE_REG32(p, idx, val) (*(uint64_t *)((char *)(p) + g_aReg32Index[idx]) = (uint32_t)val) #define DIS_PTR_REG32(p, idx) ( (uint32_t *)((char *)(p) + g_aReg32Index[idx])) /** * Array for accessing 16-bit general registers in CPUMCTXCORE structure * by register's index from disasm. */ static const unsigned g_aReg16Index[] = { RT_OFFSETOF(CPUMCTXCORE, eax), /* DISGREG_AX */ RT_OFFSETOF(CPUMCTXCORE, ecx), /* DISGREG_CX */ RT_OFFSETOF(CPUMCTXCORE, edx), /* DISGREG_DX */ RT_OFFSETOF(CPUMCTXCORE, ebx), /* DISGREG_BX */ RT_OFFSETOF(CPUMCTXCORE, esp), /* DISGREG_SP */ RT_OFFSETOF(CPUMCTXCORE, ebp), /* DISGREG_BP */ RT_OFFSETOF(CPUMCTXCORE, esi), /* DISGREG_SI */ RT_OFFSETOF(CPUMCTXCORE, edi), /* DISGREG_DI */ RT_OFFSETOF(CPUMCTXCORE, r8), /* DISGREG_R8W */ RT_OFFSETOF(CPUMCTXCORE, r9), /* DISGREG_R9W */ RT_OFFSETOF(CPUMCTXCORE, r10), /* DISGREG_R10W */ RT_OFFSETOF(CPUMCTXCORE, r11), /* DISGREG_R11W */ RT_OFFSETOF(CPUMCTXCORE, r12), /* DISGREG_R12W */ RT_OFFSETOF(CPUMCTXCORE, r13), /* DISGREG_R13W */ RT_OFFSETOF(CPUMCTXCORE, r14), /* DISGREG_R14W */ RT_OFFSETOF(CPUMCTXCORE, r15) /* DISGREG_R15W */ }; /** * Macro for accessing 16-bit general purpose registers in CPUMCTXCORE structure. */ #define DIS_READ_REG16(p, idx) (*(uint16_t *)((char *)(p) + g_aReg16Index[idx])) #define DIS_WRITE_REG16(p, idx, val) (*(uint16_t *)((char *)(p) + g_aReg16Index[idx]) = val) #define DIS_PTR_REG16(p, idx) ( (uint16_t *)((char *)(p) + g_aReg16Index[idx])) /** * Array for accessing 8-bit general registers in CPUMCTXCORE structure * by register's index from disasm. */ static const unsigned g_aReg8Index[] = { RT_OFFSETOF(CPUMCTXCORE, eax), /* DISGREG_AL */ RT_OFFSETOF(CPUMCTXCORE, ecx), /* DISGREG_CL */ RT_OFFSETOF(CPUMCTXCORE, edx), /* DISGREG_DL */ RT_OFFSETOF(CPUMCTXCORE, ebx), /* DISGREG_BL */ RT_OFFSETOF_ADD(CPUMCTXCORE, eax, 1), /* DISGREG_AH */ RT_OFFSETOF_ADD(CPUMCTXCORE, ecx, 1), /* DISGREG_CH */ RT_OFFSETOF_ADD(CPUMCTXCORE, edx, 1), /* DISGREG_DH */ RT_OFFSETOF_ADD(CPUMCTXCORE, ebx, 1), /* DISGREG_BH */ RT_OFFSETOF(CPUMCTXCORE, r8), /* DISGREG_R8B */ RT_OFFSETOF(CPUMCTXCORE, r9), /* DISGREG_R9B */ RT_OFFSETOF(CPUMCTXCORE, r10), /* DISGREG_R10B*/ RT_OFFSETOF(CPUMCTXCORE, r11), /* DISGREG_R11B */ RT_OFFSETOF(CPUMCTXCORE, r12), /* DISGREG_R12B */ RT_OFFSETOF(CPUMCTXCORE, r13), /* DISGREG_R13B */ RT_OFFSETOF(CPUMCTXCORE, r14), /* DISGREG_R14B */ RT_OFFSETOF(CPUMCTXCORE, r15), /* DISGREG_R15B */ RT_OFFSETOF(CPUMCTXCORE, esp), /* DISGREG_SPL; with REX prefix only */ RT_OFFSETOF(CPUMCTXCORE, ebp), /* DISGREG_BPL; with REX prefix only */ RT_OFFSETOF(CPUMCTXCORE, esi), /* DISGREG_SIL; with REX prefix only */ RT_OFFSETOF(CPUMCTXCORE, edi) /* DISGREG_DIL; with REX prefix only */ }; /** * Macro for accessing 8-bit general purpose registers in CPUMCTXCORE structure. */ #define DIS_READ_REG8(p, idx) (*(uint8_t *)((char *)(p) + g_aReg8Index[idx])) #define DIS_WRITE_REG8(p, idx, val) (*(uint8_t *)((char *)(p) + g_aReg8Index[idx]) = val) #define DIS_PTR_REG8(p, idx) ( (uint8_t *)((char *)(p) + g_aReg8Index[idx])) /** * Array for accessing segment registers in CPUMCTXCORE structure * by register's index from disasm. */ static const unsigned g_aRegSegIndex[] = { RT_OFFSETOF(CPUMCTXCORE, es), /* DISSELREG_ES */ RT_OFFSETOF(CPUMCTXCORE, cs), /* DISSELREG_CS */ RT_OFFSETOF(CPUMCTXCORE, ss), /* DISSELREG_SS */ RT_OFFSETOF(CPUMCTXCORE, ds), /* DISSELREG_DS */ RT_OFFSETOF(CPUMCTXCORE, fs), /* DISSELREG_FS */ RT_OFFSETOF(CPUMCTXCORE, gs) /* DISSELREG_GS */ }; /** * Macro for accessing segment registers in CPUMCTXCORE structure. */ #define DIS_READ_REGSEG(p, idx) (*((uint16_t *)((char *)(p) + g_aRegSegIndex[idx]))) #define DIS_WRITE_REGSEG(p, idx, val) (*((uint16_t *)((char *)(p) + g_aRegSegIndex[idx])) = val) /** * Returns the value of the specified 8 bits general purpose register * */ DISDECL(int) DISFetchReg8(PCCPUMCTXCORE pCtx, unsigned reg8, uint8_t *pVal) { AssertReturnStmt(reg8 < RT_ELEMENTS(g_aReg8Index), *pVal = 0, VERR_INVALID_PARAMETER); *pVal = DIS_READ_REG8(pCtx, reg8); return VINF_SUCCESS; } /** * Returns the value of the specified 16 bits general purpose register * */ DISDECL(int) DISFetchReg16(PCCPUMCTXCORE pCtx, unsigned reg16, uint16_t *pVal) { AssertReturnStmt(reg16 < RT_ELEMENTS(g_aReg16Index), *pVal = 0, VERR_INVALID_PARAMETER); *pVal = DIS_READ_REG16(pCtx, reg16); return VINF_SUCCESS; } /** * Returns the value of the specified 32 bits general purpose register * */ DISDECL(int) DISFetchReg32(PCCPUMCTXCORE pCtx, unsigned reg32, uint32_t *pVal) { AssertReturnStmt(reg32 < RT_ELEMENTS(g_aReg32Index), *pVal = 0, VERR_INVALID_PARAMETER); *pVal = DIS_READ_REG32(pCtx, reg32); return VINF_SUCCESS; } /** * Returns the value of the specified 64 bits general purpose register * */ DISDECL(int) DISFetchReg64(PCCPUMCTXCORE pCtx, unsigned reg64, uint64_t *pVal) { AssertReturnStmt(reg64 < RT_ELEMENTS(g_aReg64Index), *pVal = 0, VERR_INVALID_PARAMETER); *pVal = DIS_READ_REG64(pCtx, reg64); return VINF_SUCCESS; } /** * Returns the pointer to the specified 8 bits general purpose register * */ DISDECL(int) DISPtrReg8(PCPUMCTXCORE pCtx, unsigned reg8, uint8_t **ppReg) { AssertReturnStmt(reg8 < RT_ELEMENTS(g_aReg8Index), *ppReg = NULL, VERR_INVALID_PARAMETER); *ppReg = DIS_PTR_REG8(pCtx, reg8); return VINF_SUCCESS; } /** * Returns the pointer to the specified 16 bits general purpose register * */ DISDECL(int) DISPtrReg16(PCPUMCTXCORE pCtx, unsigned reg16, uint16_t **ppReg) { AssertReturnStmt(reg16 < RT_ELEMENTS(g_aReg16Index), *ppReg = NULL, VERR_INVALID_PARAMETER); *ppReg = DIS_PTR_REG16(pCtx, reg16); return VINF_SUCCESS; } /** * Returns the pointer to the specified 32 bits general purpose register */ DISDECL(int) DISPtrReg32(PCPUMCTXCORE pCtx, unsigned reg32, uint32_t **ppReg) { AssertReturnStmt(reg32 < RT_ELEMENTS(g_aReg32Index), *ppReg = NULL, VERR_INVALID_PARAMETER); *ppReg = DIS_PTR_REG32(pCtx, reg32); return VINF_SUCCESS; } /** * Returns the pointer to the specified 64 bits general purpose register */ DISDECL(int) DISPtrReg64(PCPUMCTXCORE pCtx, unsigned reg64, uint64_t **ppReg) { AssertReturnStmt(reg64 < RT_ELEMENTS(g_aReg64Index), *ppReg = NULL, VERR_INVALID_PARAMETER); *ppReg = DIS_PTR_REG64(pCtx, reg64); return VINF_SUCCESS; } /** * Returns the value of the specified segment register */ DISDECL(int) DISFetchRegSeg(PCCPUMCTXCORE pCtx, DISSELREG sel, RTSEL *pVal) { AssertReturn((unsigned)sel < RT_ELEMENTS(g_aRegSegIndex), VERR_INVALID_PARAMETER); AssertCompile(sizeof(uint16_t) == sizeof(RTSEL)); *pVal = DIS_READ_REGSEG(pCtx, sel); return VINF_SUCCESS; } /** * Updates the value of the specified 64 bits general purpose register * */ DISDECL(int) DISWriteReg64(PCPUMCTXCORE pRegFrame, unsigned reg64, uint64_t val64) { AssertReturn(reg64 < RT_ELEMENTS(g_aReg64Index), VERR_INVALID_PARAMETER); DIS_WRITE_REG64(pRegFrame, reg64, val64); return VINF_SUCCESS; } /** * Updates the value of the specified 32 bits general purpose register * */ DISDECL(int) DISWriteReg32(PCPUMCTXCORE pRegFrame, unsigned reg32, uint32_t val32) { AssertReturn(reg32 < RT_ELEMENTS(g_aReg32Index), VERR_INVALID_PARAMETER); DIS_WRITE_REG32(pRegFrame, reg32, val32); return VINF_SUCCESS; } /** * Updates the value of the specified 16 bits general purpose register * */ DISDECL(int) DISWriteReg16(PCPUMCTXCORE pRegFrame, unsigned reg16, uint16_t val16) { AssertReturn(reg16 < RT_ELEMENTS(g_aReg16Index), VERR_INVALID_PARAMETER); DIS_WRITE_REG16(pRegFrame, reg16, val16); return VINF_SUCCESS; } /** * Updates the specified 8 bits general purpose register * */ DISDECL(int) DISWriteReg8(PCPUMCTXCORE pRegFrame, unsigned reg8, uint8_t val8) { AssertReturn(reg8 < RT_ELEMENTS(g_aReg8Index), VERR_INVALID_PARAMETER); DIS_WRITE_REG8(pRegFrame, reg8, val8); return VINF_SUCCESS; } /** * Updates the specified segment register * */ DISDECL(int) DISWriteRegSeg(PCPUMCTXCORE pCtx, DISSELREG sel, RTSEL val) { AssertReturn((unsigned)sel < RT_ELEMENTS(g_aRegSegIndex), VERR_INVALID_PARAMETER); AssertCompile(sizeof(uint16_t) == sizeof(RTSEL)); DIS_WRITE_REGSEG(pCtx, sel, val); return VINF_SUCCESS; } /** * Returns the value of the parameter in pParam * * @returns VBox error code * @param pCtx CPU context structure pointer * @param pDis Pointer to the disassembler state. * @param pParam Pointer to the parameter to parse * @param pParamVal Pointer to parameter value (OUT) * @param parmtype Parameter type * * @note Currently doesn't handle FPU/XMM/MMX/3DNow! parameters correctly!! * */ DISDECL(int) DISQueryParamVal(PCPUMCTXCORE pCtx, PCDISSTATE pDis, PCDISOPPARAM pParam, PDISQPVPARAMVAL pParamVal, DISQPVWHICH parmtype) { memset(pParamVal, 0, sizeof(*pParamVal)); if (DISUSE_IS_EFFECTIVE_ADDR(pParam->fUse)) { // Effective address pParamVal->type = DISQPV_TYPE_ADDRESS; pParamVal->size = pParam->cb; if (pParam->fUse & DISUSE_BASE) { if (pParam->fUse & DISUSE_REG_GEN8) { pParamVal->flags |= DISQPV_FLAG_8; if (RT_FAILURE(DISFetchReg8(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val8))) return VERR_INVALID_PARAMETER; } else if (pParam->fUse & DISUSE_REG_GEN16) { pParamVal->flags |= DISQPV_FLAG_16; if (RT_FAILURE(DISFetchReg16(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val16))) return VERR_INVALID_PARAMETER; } else if (pParam->fUse & DISUSE_REG_GEN32) { pParamVal->flags |= DISQPV_FLAG_32; if (RT_FAILURE(DISFetchReg32(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val32))) return VERR_INVALID_PARAMETER; } else if (pParam->fUse & DISUSE_REG_GEN64) { pParamVal->flags |= DISQPV_FLAG_64; if (RT_FAILURE(DISFetchReg64(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val64))) return VERR_INVALID_PARAMETER; } else { AssertFailed(); return VERR_INVALID_PARAMETER; } } // Note that scale implies index (SIB byte) if (pParam->fUse & DISUSE_INDEX) { if (pParam->fUse & DISUSE_REG_GEN16) { uint16_t val16; pParamVal->flags |= DISQPV_FLAG_16; if (RT_FAILURE(DISFetchReg16(pCtx, pParam->Index.idxGenReg, &val16))) return VERR_INVALID_PARAMETER; Assert(!(pParam->fUse & DISUSE_SCALE)); /* shouldn't be possible in 16 bits mode */ pParamVal->val.val16 += val16; } else if (pParam->fUse & DISUSE_REG_GEN32) { uint32_t val32; pParamVal->flags |= DISQPV_FLAG_32; if (RT_FAILURE(DISFetchReg32(pCtx, pParam->Index.idxGenReg, &val32))) return VERR_INVALID_PARAMETER; if (pParam->fUse & DISUSE_SCALE) val32 *= pParam->uScale; pParamVal->val.val32 += val32; } else if (pParam->fUse & DISUSE_REG_GEN64) { uint64_t val64; pParamVal->flags |= DISQPV_FLAG_64; if (RT_FAILURE(DISFetchReg64(pCtx, pParam->Index.idxGenReg, &val64))) return VERR_INVALID_PARAMETER; if (pParam->fUse & DISUSE_SCALE) val64 *= pParam->uScale; pParamVal->val.val64 += val64; } else AssertFailed(); } if (pParam->fUse & DISUSE_DISPLACEMENT8) { if (pDis->uCpuMode == DISCPUMODE_32BIT) pParamVal->val.i32 += (int32_t)pParam->uDisp.i8; else if (pDis->uCpuMode == DISCPUMODE_64BIT) pParamVal->val.i64 += (int64_t)pParam->uDisp.i8; else pParamVal->val.i16 += (int16_t)pParam->uDisp.i8; } else if (pParam->fUse & DISUSE_DISPLACEMENT16) { if (pDis->uCpuMode == DISCPUMODE_32BIT) pParamVal->val.i32 += (int32_t)pParam->uDisp.i16; else if (pDis->uCpuMode == DISCPUMODE_64BIT) pParamVal->val.i64 += (int64_t)pParam->uDisp.i16; else pParamVal->val.i16 += pParam->uDisp.i16; } else if (pParam->fUse & DISUSE_DISPLACEMENT32) { if (pDis->uCpuMode == DISCPUMODE_32BIT) pParamVal->val.i32 += pParam->uDisp.i32; else pParamVal->val.i64 += pParam->uDisp.i32; } else if (pParam->fUse & DISUSE_DISPLACEMENT64) { Assert(pDis->uCpuMode == DISCPUMODE_64BIT); pParamVal->val.i64 += pParam->uDisp.i64; } else if (pParam->fUse & DISUSE_RIPDISPLACEMENT32) { Assert(pDis->uCpuMode == DISCPUMODE_64BIT); /* Relative to the RIP of the next instruction. */ pParamVal->val.i64 += pParam->uDisp.i32 + pCtx->rip + pDis->cbInstr; } return VINF_SUCCESS; } if (pParam->fUse & (DISUSE_REG_GEN8|DISUSE_REG_GEN16|DISUSE_REG_GEN32|DISUSE_REG_GEN64|DISUSE_REG_FP|DISUSE_REG_MMX|DISUSE_REG_XMM|DISUSE_REG_CR|DISUSE_REG_DBG|DISUSE_REG_SEG|DISUSE_REG_TEST)) { if (parmtype == DISQPVWHICH_DST) { // Caller needs to interpret the register according to the instruction (source/target, special value etc) pParamVal->type = DISQPV_TYPE_REGISTER; pParamVal->size = pParam->cb; return VINF_SUCCESS; } //else DISQPVWHICH_SRC pParamVal->type = DISQPV_TYPE_IMMEDIATE; if (pParam->fUse & DISUSE_REG_GEN8) { pParamVal->flags |= DISQPV_FLAG_8; pParamVal->size = sizeof(uint8_t); if (RT_FAILURE(DISFetchReg8(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val8))) return VERR_INVALID_PARAMETER; } else if (pParam->fUse & DISUSE_REG_GEN16) { pParamVal->flags |= DISQPV_FLAG_16; pParamVal->size = sizeof(uint16_t); if (RT_FAILURE(DISFetchReg16(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val16))) return VERR_INVALID_PARAMETER; } else if (pParam->fUse & DISUSE_REG_GEN32) { pParamVal->flags |= DISQPV_FLAG_32; pParamVal->size = sizeof(uint32_t); if (RT_FAILURE(DISFetchReg32(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val32))) return VERR_INVALID_PARAMETER; } else if (pParam->fUse & DISUSE_REG_GEN64) { pParamVal->flags |= DISQPV_FLAG_64; pParamVal->size = sizeof(uint64_t); if (RT_FAILURE(DISFetchReg64(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val64))) return VERR_INVALID_PARAMETER; } else { // Caller needs to interpret the register according to the instruction (source/target, special value etc) pParamVal->type = DISQPV_TYPE_REGISTER; } Assert(!(pParam->fUse & DISUSE_IMMEDIATE)); return VINF_SUCCESS; } if (pParam->fUse & DISUSE_IMMEDIATE) { pParamVal->type = DISQPV_TYPE_IMMEDIATE; if (pParam->fUse & (DISUSE_IMMEDIATE8|DISUSE_IMMEDIATE8_REL)) { pParamVal->flags |= DISQPV_FLAG_8; if (pParam->cb == 2) { pParamVal->size = sizeof(uint16_t); pParamVal->val.val16 = (uint8_t)pParam->uValue; } else { pParamVal->size = sizeof(uint8_t); pParamVal->val.val8 = (uint8_t)pParam->uValue; } } else if (pParam->fUse & (DISUSE_IMMEDIATE16|DISUSE_IMMEDIATE16_REL|DISUSE_IMMEDIATE_ADDR_0_16|DISUSE_IMMEDIATE16_SX8)) { pParamVal->flags |= DISQPV_FLAG_16; pParamVal->size = sizeof(uint16_t); pParamVal->val.val16 = (uint16_t)pParam->uValue; AssertMsg(pParamVal->size == pParam->cb || ((pParam->cb == 1) && (pParam->fUse & DISUSE_IMMEDIATE16_SX8)), ("pParamVal->size %d vs %d EIP=%RX32\n", pParamVal->size, pParam->cb, pCtx->eip) ); } else if (pParam->fUse & (DISUSE_IMMEDIATE32|DISUSE_IMMEDIATE32_REL|DISUSE_IMMEDIATE_ADDR_0_32|DISUSE_IMMEDIATE32_SX8)) { pParamVal->flags |= DISQPV_FLAG_32; pParamVal->size = sizeof(uint32_t); pParamVal->val.val32 = (uint32_t)pParam->uValue; Assert(pParamVal->size == pParam->cb || ((pParam->cb == 1) && (pParam->fUse & DISUSE_IMMEDIATE32_SX8)) ); } else if (pParam->fUse & (DISUSE_IMMEDIATE64 | DISUSE_IMMEDIATE64_REL | DISUSE_IMMEDIATE64_SX8)) { pParamVal->flags |= DISQPV_FLAG_64; pParamVal->size = sizeof(uint64_t); pParamVal->val.val64 = pParam->uValue; Assert(pParamVal->size == pParam->cb || ((pParam->cb == 1) && (pParam->fUse & DISUSE_IMMEDIATE64_SX8)) ); } else if (pParam->fUse & (DISUSE_IMMEDIATE_ADDR_16_16)) { pParamVal->flags |= DISQPV_FLAG_FARPTR16; pParamVal->size = sizeof(uint16_t)*2; pParamVal->val.farptr.sel = (uint16_t)RT_LOWORD(pParam->uValue >> 16); pParamVal->val.farptr.offset = (uint32_t)RT_LOWORD(pParam->uValue); Assert(pParamVal->size == pParam->cb); } else if (pParam->fUse & (DISUSE_IMMEDIATE_ADDR_16_32)) { pParamVal->flags |= DISQPV_FLAG_FARPTR32; pParamVal->size = sizeof(uint16_t) + sizeof(uint32_t); pParamVal->val.farptr.sel = (uint16_t)RT_LOWORD(pParam->uValue >> 32); pParamVal->val.farptr.offset = (uint32_t)(pParam->uValue & 0xFFFFFFFF); Assert(pParam->cb == 8); } } return VINF_SUCCESS; } /** * Returns the pointer to a register of the parameter in pParam. We need this * pointer when an interpreted instruction updates a register as a side effect. * In CMPXCHG we know that only [r/e]ax is updated, but with XADD this could * be every register. * * @returns VBox error code * @param pCtx CPU context structure pointer * @param pDis Pointer to the disassembler state. * @param pParam Pointer to the parameter to parse * @param pReg Pointer to parameter value (OUT) * @param cbsize Parameter size (OUT) * * @note Currently doesn't handle FPU/XMM/MMX/3DNow! parameters correctly!! * */ DISDECL(int) DISQueryParamRegPtr(PCPUMCTXCORE pCtx, PCDISSTATE pDis, PCDISOPPARAM pParam, void **ppReg, size_t *pcbSize) { NOREF(pDis); if (pParam->fUse & (DISUSE_REG_GEN8|DISUSE_REG_GEN16|DISUSE_REG_GEN32|DISUSE_REG_FP|DISUSE_REG_MMX|DISUSE_REG_XMM|DISUSE_REG_CR|DISUSE_REG_DBG|DISUSE_REG_SEG|DISUSE_REG_TEST)) { if (pParam->fUse & DISUSE_REG_GEN8) { uint8_t *pu8Reg; if (RT_SUCCESS(DISPtrReg8(pCtx, pParam->Base.idxGenReg, &pu8Reg))) { *pcbSize = sizeof(uint8_t); *ppReg = (void *)pu8Reg; return VINF_SUCCESS; } } else if (pParam->fUse & DISUSE_REG_GEN16) { uint16_t *pu16Reg; if (RT_SUCCESS(DISPtrReg16(pCtx, pParam->Base.idxGenReg, &pu16Reg))) { *pcbSize = sizeof(uint16_t); *ppReg = (void *)pu16Reg; return VINF_SUCCESS; } } else if (pParam->fUse & DISUSE_REG_GEN32) { uint32_t *pu32Reg; if (RT_SUCCESS(DISPtrReg32(pCtx, pParam->Base.idxGenReg, &pu32Reg))) { *pcbSize = sizeof(uint32_t); *ppReg = (void *)pu32Reg; return VINF_SUCCESS; } } else if (pParam->fUse & DISUSE_REG_GEN64) { uint64_t *pu64Reg; if (RT_SUCCESS(DISPtrReg64(pCtx, pParam->Base.idxGenReg, &pu64Reg))) { *pcbSize = sizeof(uint64_t); *ppReg = (void *)pu64Reg; return VINF_SUCCESS; } } } return VERR_INVALID_PARAMETER; }