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zydis/VerteronDisassemblerEngine/VXInstructionFormatter.c

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/**************************************************************************************************
Verteron Disassembler Engine
Version 1.0
Remarks : Freeware, Copyright must be included
Original Author : Florian Bernd
Modifications : athre0z
Last change : 19. March 2014
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
**************************************************************************************************/
#include "VXInstructionFormatter.h"
#include "VXDisassemblerUtils.h"
#include "VXInternalHelpers.h"
#include "VXOpcodeTableInternal.h"
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <stdio.h>
/* Interface =================================================================================== */
/* VXBaseSymbolResolver ------------------------------------------------------------------------ */
typedef void (*VXBaseSymbolResolver_DestructionCallback)(
VXBaseSymbolResolverContext *ctx);
typedef const char* (*VXBaseSymbolResolver_ResolveSymbolCallback)(
VXBaseSymbolResolverContext *ctx,
const VXInstructionInfo *info,
uint64_t address,
uint64_t *offset);
typedef struct _VXBaseSymbolResolver
{
VXBaseSymbolResolver_DestructionCallback destruct; // may be NULL
VXBaseSymbolResolver_ResolveSymbolCallback resolveCallback;
} VXBaseSymbolResolver;
/**
* @brief Constructor.
* @param ctx The context.
*/
static void VXBaseSymbolResolver_Construct(VXBaseSymbolResolverContext *ctx);
/**
* @brief Destructor.
* @param ctx The context.
*/
static void VXBaseSymbolResolver_Destruct(VXBaseSymbolResolverContext *ctx);
/* VXBaseInstructionFormatter ------------------------------------------------------------------ */
typedef void(*VXBaseInstructionFormatter_DestructionCallback)(
VXBaseInstructionFormatterContext *ctx);
typedef void(*VXBaseInstructionFormatter_InternalFormatInstructionCallback)(
VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info);
typedef struct _VXBaseInstructionFormatter
{
VXBaseInstructionFormatter_DestructionCallback destruct; // may be NULL
VXBaseInstructionFormatter_InternalFormatInstructionCallback internalFormat;
VXBaseSymbolResolverContext *symbolResolver;
char *outputBuffer;
size_t outputBufferCapacity;
size_t outputStringLen;
bool outputUppercase;
} VXBaseInstructionFormatter;
/**
* @brief Constructor.
* @param ctx The context.
* @param symbolResolver The symbol resolver to use when formatting addresses.
*/
static void VXBaseInstructionFormatter_Construct(VXBaseInstructionFormatterContext *ctx,
VXBaseSymbolResolverContext *symbolResolver);
/**
* @brief Destructor.
* @param ctx The context.
*/
static void VXBaseInstructionFormatter_Destruct(VXBaseInstructionFormatterContext *ctx);
/*static void VXBaseInstructionFormatter_OutputSetUppercase(
VXBaseInstructionFormatterContext *ctx, bool uppercase);*/
/**
* @brief Returns the string representation of a given register.
* @param ctx The context.
* @param reg The register.
* @return The string representation of the given register.
*/
static char const* VXBaseInstructionFormatter_RegisterToString(
const VXBaseInstructionFormatterContext *ctx, VXRegister reg);
/**
* @brief Resolves a symbol.
* @param ctx The context.
* @param info The instruction info.
* @param address The address.
* @param offset Reference to an unsigned 64 bit integer that receives an offset relative
* to the base address of the symbol.
* @return The name of the symbol, if the symbol was found, @c NULL if not.
*/
static char const* VXBaseInstructionFormatter_ResolveSymbol(
const VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info, uint64_t address,
uint64_t *offset);
/**
* @brief Clears the output string buffer.
* @param ctx The context.
*/
static void VXBaseInstructionFormatter_OutputClear(VXBaseInstructionFormatterContext *ctx);
/**
* @brief Returns the content of the output string buffer.
* @param ctx The context.
* @return Pointer to the content of the ouput string buffer.
*/
static char const* VXBaseInstructionFormatter_OutputString(VXBaseInstructionFormatterContext *ctx);
/**
* @brief Appends text to the ouput string buffer.
* @param ctx The context.
* @param text The text.
*/
static void VXBaseInstructionFormatter_OutputAppend(VXBaseInstructionFormatterContext *ctx,
char const *text);
/**
* @brief Appends formatted text to the output string buffer.
* @param ctx The context.
* @param format The format string.
*/
static void VXBaseInstructionFormatter_OutputAppendFormatted(
VXBaseInstructionFormatterContext *ctx, char const *format, ...);
/**
* @brief Appends a formatted address to the output string buffer.
* @param ctx The context.
* @param info The instruction info.
* @param address The address.
* @param resolveSymbols If this parameter is true, the function will try to display a
* smybol name instead of the numeric value.
*/
static void VXBaseInstructionFormatter_OutputAppendAddress(VXBaseInstructionFormatterContext *ctx,
const VXInstructionInfo *info, uint64_t address, bool resolveSymbols);
/**
* @brief Appends a formatted immediate value to the output string buffer.
* @param ctx The context.
* @param info The instruction info.
* @param operand The immediate operand.
* @param resolveSymbols If this parameter is true, the function will try to display a
* smybol name instead of the numeric value.
*/
static void VXBaseInstructionFormatter_OutputAppendImmediate(
VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info,
const VXOperandInfo *operand, bool resolveSymbols);
/**
* @brief Appends a formatted memory displacement value to the output string buffer.
* @param ctx The context.
* @param operand The memory operand.
*/
static void VXBaseInstructionFormatter_OutputAppendDisplacement(
VXBaseInstructionFormatterContext *ctx, const VXOperandInfo *operand);
/* VXCustomSymbolResolver ---------------------------------------------------------------------- */
typedef struct _VXCustomSymbolResolver
{
VXBaseSymbolResolver super;
VXCustomSymbolResolver_ResolveSymbolCallback resolve;
void *userData;
} VXCustomSymbolResolver;
/**
* @brief Constructor.
* @param ctx The context.
* @param resolverCb The resolver callback.
* @param userData User defined data passed to the resolver callback.
*/
static void VXCustomSymbolResolver_Construct(VXBaseSymbolResolverContext *ctx,
VXCustomSymbolResolver_ResolveSymbolCallback resolverCb, void *userData);
/**
* @brief Destructor.
* @param ctx The context.
*/
static void VXCustomSymbolResolver_Destruct(VXBaseSymbolResolverContext *ctx);
/**
* @copydoc VXBaseSymbolResolver_Resolve
*/
static const char* VXCustomSymbolResolver_Resolve(VXBaseSymbolResolverContext *ctx,
const VXInstructionInfo *info, uint64_t address, uint64_t *offset);
/* VXIntelInstructionFormatter ----------------------------------------------------------------- */
typedef struct _VXIntelInstructionFormatter
{
VXBaseInstructionFormatter super;
} VXIntelInstructionFormatter;
/**
* @brief Constructor.
* @param ctx The context.
* @param symbolResolver The symbol resolver used to resolve addresses.
* @param userData User defined data passed to the resolver callback.
*/
static void VXIntelInstructionFormatter_Construct(VXBaseInstructionFormatterContext *ctx,
VXBaseSymbolResolverContext *symbolResolver);
/**
* @brief Destructor.
* @param ctx The context.
*/
static void VXIntelInstructionFormatter_Destruct(VXBaseInstructionFormatterContext *ctx);
/**
* @brief Appends an operand cast to the output string buffer.
* @param ctx The context.
* @param operand The operand.
*/
static void VXIntelInstructionFormatter_OutputAppendOperandCast(
VXBaseInstructionFormatterContext *ctx, const VXOperandInfo *operand);
/**
* @brief Formats the specified operand and appends it to the output buffer.
* @param ctx The context.
* @param info The instruction info.
* @param operand The operand.
*/
static void VXIntelInstructionFormatter_FormatOperand(VXBaseInstructionFormatterContext *ctx,
const VXInstructionInfo *info, const VXOperandInfo *operand);
/**
* @coypdoc VXBaseInstructionFormatter_InternalFormatInstruction
*/
static void VXIntelInstructionFormatter_InternalFormatInstruction(
VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info);
/* Implementation ============================================================================== */
/* VXBaseSymbolResolver ------------------------------------------------------------------------ */
void VXBaseSymbolResolver_Construct(VXBaseSymbolResolverContext *ctx)
{
memset(VXBaseSymbolResolver_thiz(ctx), 0, sizeof(VXBaseSymbolResolver));
}
void VXBaseSymbolResolver_Destruct(VXBaseSymbolResolverContext *ctx)
{
VX_UNUSED(ctx);
}
void VXBaseSymbolResolver_Release(VXBaseSymbolResolverContext *ctx)
{
VXBaseSymbolResolver *thiz = VXBaseSymbolResolver_thiz(ctx);
if (thiz->destruct)
{
thiz->destruct(ctx);
}
free(thiz);
free(ctx);
}
const char* VXBaseSymbolResolver_ResolveSymbol(VXBaseSymbolResolverContext *ctx,
const VXInstructionInfo *info, uint64_t address, uint64_t *offset)
{
assert(VXBaseSymbolResolver_thiz(ctx)->resolveCallback);
return VXBaseSymbolResolver_thiz(ctx)->resolveCallback(ctx, info, address, offset);
}
/* VXCustomSymbolResolver ---------------------------------------------------------------------- */
static void VXCustomSymbolResolver_Construct(VXBaseSymbolResolverContext *ctx,
VXCustomSymbolResolver_ResolveSymbolCallback resolverCb, void *userData)
{
VXBaseSymbolResolver_Construct(ctx);
VXCustomSymbolResolver *thiz = VXCustomSymbolResolver_thiz(ctx);
thiz->super.destruct = &VXCustomSymbolResolver_Destruct;
thiz->super.resolveCallback = &VXCustomSymbolResolver_Resolve;
thiz->resolve = resolverCb;
thiz->userData = userData;
}
static void VXCustomSymbolResolver_Destruct(VXBaseSymbolResolverContext *ctx)
{
VXBaseSymbolResolver_Destruct(ctx);
}
VXBaseSymbolResolverContext* VXCustomSymbolResolver_Create(
VXCustomSymbolResolver_ResolveSymbolCallback resolverCb, void *userData)
{
VXCustomSymbolResolver *thiz = malloc(sizeof(VXCustomSymbolResolver));
VXBaseSymbolResolverContext *ctx = malloc(sizeof(VXBaseSymbolResolverContext));
if (!thiz || !ctx)
{
if (thiz)
{
free(thiz);
}
if (ctx)
{
free(ctx);
}
return NULL;
}
ctx->d.type = TYPE_CUSTOMSYMBOLRESOLVER;
ctx->d.ptr = thiz;
VXCustomSymbolResolver_Construct(ctx, resolverCb, userData);
return ctx;
}
static const char* VXCustomSymbolResolver_Resolve(VXBaseSymbolResolverContext *ctx,
const VXInstructionInfo *info, uint64_t address, uint64_t *offset)
{
VXCustomSymbolResolver *thiz = VXCustomSymbolResolver_thiz(ctx);
return thiz->resolve(info, address, offset, thiz->userData);
}
/* VXBaseInstructionFormatter ------------------------------------------------------------------ */
static const char* VXBaseInstructionFormatter_registerStrings[] =
{
/* 8 bit general purpose registers */
"al", "cl", "dl", "bl",
"ah", "ch", "dh", "bh",
"spl", "bpl", "sil", "dil",
"r8b", "r9b", "r10b", "r11b",
"r12b", "r13b", "r14b", "r15b",
/* 16 bit general purpose registers */
"ax", "cx", "dx", "bx",
"sp", "bp", "si", "di",
"r8w", "r9w", "r10w", "r11w",
"r12w", "r13w", "r14w", "r15w",
/* 32 bit general purpose registers */
"eax", "ecx", "edx", "ebx",
"esp", "ebp", "esi", "edi",
"r8d", "r9d", "r10d", "r11d",
"r12d", "r13d", "r14d", "r15d",
/* 64 bit general purpose registers */
"rax", "rcx", "rdx", "rbx",
"rsp", "rbp", "rsi", "rdi",
"r8", "r9", "r10", "r11",
"r12", "r13", "r14", "r15",
/* segment registers */
"es", "cs", "ss",
"ds", "fs", "gs",
/* control registers */
"cr0", "cr1", "cr2", "cr3",
"cr4", "cr5", "cr6", "cr7",
"cr8", "cr9", "cr10", "cr11",
"cr12", "cr13", "cr14", "cr15",
/* debug registers */
"dr0", "dr1", "dr2", "dr3",
"dr4", "dr5", "dr6", "dr7",
"dr8", "dr9", "dr10", "dr11",
"dr12", "dr13", "dr14", "dr15",
/* mmx registers */
"mm0", "mm1", "mm2", "mm3",
"mm4", "mm5", "mm6", "mm7",
/* x87 registers */
"st0", "st1", "st2", "st3",
"st4", "st5", "st6", "st7",
/* extended multimedia registers */
"xmm0", "xmm1", "xmm2", "xmm3",
"xmm4", "xmm5", "xmm6", "xmm7",
"xmm8", "xmm9", "xmm10", "xmm11",
"xmm12", "xmm13", "xmm14", "xmm15",
/* 256 bit multimedia registers */
"ymm0", "ymm1", "ymm2", "ymm3",
"ymm4", "ymm5", "ymm6", "ymm7",
"ymm8", "ymm9", "ymm10", "ymm11",
"ymm12", "ymm13", "ymm14", "ymm15",
/* instruction pointer register */
"rip"
};
static void VXBaseInstructionFormatter_Construct(VXBaseInstructionFormatterContext *ctx,
VXBaseSymbolResolverContext *symbolResolver)
{
VXBaseInstructionFormatter *thiz = VXBaseInstructionFormatter_thiz(ctx);
thiz->destruct = &VXBaseInstructionFormatter_Destruct;
thiz->internalFormat = NULL;
thiz->symbolResolver = symbolResolver;
thiz->outputStringLen = 0;
thiz->outputUppercase = false;
thiz->outputBufferCapacity = 256;
thiz->outputBuffer = malloc(thiz->outputBufferCapacity);
}
static void VXBaseInstructionFormatter_Destruct(VXBaseInstructionFormatterContext *ctx)
{
VXBaseInstructionFormatter *thiz = VXBaseInstructionFormatter_thiz(ctx);
if (thiz->outputBuffer)
{
free(thiz->outputBuffer);
thiz->outputBuffer = NULL;
}
}
void VXBaseInstructionFormatter_Release(VXBaseInstructionFormatterContext *ctx)
{
VXBaseInstructionFormatter *thiz = VXBaseInstructionFormatter_thiz(ctx);
if (thiz->destruct)
{
thiz->destruct(ctx);
}
free(thiz);
free(ctx);
}
/*
static void VXBaseInstructionFormatter_OutputSetUppercase(VXBaseInstructionFormatterContext *ctx,
bool uppercase)
{
VXBaseInstructionFormatter_thiz(ctx)->outputUppercase = uppercase;
}
*/
static char const* VXBaseInstructionFormatter_RegisterToString(
const VXBaseInstructionFormatterContext *ctx, VXRegister reg)
{
VX_UNUSED(ctx);
if (reg == REG_NONE)
{
return "error";
}
return VXBaseInstructionFormatter_registerStrings[reg - 1];
}
static char const* VXBaseInstructionFormatter_ResolveSymbol(
const VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info,
uint64_t address, uint64_t *offset)
{
const VXBaseInstructionFormatter *thiz = VXBaseInstructionFormatter_cthiz(ctx);
if (thiz->symbolResolver)
{
return VXBaseSymbolResolver_ResolveSymbol(
thiz->symbolResolver, info, address, offset);
}
return NULL;
}
VXBaseSymbolResolverContext* VXBaseInstructionFormatter_GetSymbolResolver(
const VXBaseInstructionFormatterContext *ctx)
{
return VXBaseInstructionFormatter_cthiz(ctx)->symbolResolver;
}
void VXBaseInstructionFormatter_SetSymbolResolver(
VXBaseInstructionFormatterContext *ctx, VXBaseSymbolResolverContext *symbolResolver)
{
VXBaseInstructionFormatter_thiz(ctx)->symbolResolver = symbolResolver;
}
const char* VXBaseInstructionFormatter_FormatInstruction(
VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info)
{
VXBaseInstructionFormatter *thiz = VXBaseInstructionFormatter_thiz(ctx);
// Clears the internal string buffer
VXBaseInstructionFormatter_OutputClear(ctx);
// Calls the virtual format method that actually formats the instruction
thiz->internalFormat(ctx, info);
if (thiz->outputBufferCapacity == 0)
{
// The basic instruction formatter only returns the instruction menmonic.
return VXGetInstructionMnemonicString(info->mnemonic);
}
// Return the formatted instruction string
return VXBaseInstructionFormatter_OutputString(ctx);
}
static void VXBaseInstructionFormatter_OutputClear(VXBaseInstructionFormatterContext *ctx)
{
VXBaseInstructionFormatter_thiz(ctx)->outputStringLen = 0;
}
static char const* VXBaseInstructionFormatter_OutputString(VXBaseInstructionFormatterContext *ctx)
{
return &VXBaseInstructionFormatter_thiz(ctx)->outputBuffer[0];
}
static void VXBaseInstructionFormatter_OutputAppend(
VXBaseInstructionFormatterContext *ctx, char const *text)
{
VXBaseInstructionFormatter *thiz = VXBaseInstructionFormatter_thiz(ctx);
// Get the string length including the null-terminator char
size_t strLen = strlen(text) + 1;
// Get the buffer size
size_t bufLen = thiz->outputBufferCapacity;
// Decrease the offset by one, to exclude already existing null-terminator chars in the
// output buffer
size_t offset = (thiz->outputStringLen) ? thiz->outputStringLen - 1 : 0;
// Resize capacity of the output buffer on demand and add some extra space to improve the
// performance
if (bufLen <= (thiz->outputStringLen + strLen))
{
thiz->outputBufferCapacity = bufLen + strLen + 512;
thiz->outputBuffer = realloc(thiz->outputBuffer, thiz->outputBufferCapacity);
}
// Write the text to the output buffer
memcpy(&thiz->outputBuffer[offset], text, strLen);
// Increase the string length
thiz->outputStringLen = offset + strLen;
// Convert to uppercase
if (thiz->outputUppercase)
{
for (size_t i = offset; i < thiz->outputStringLen - 1; ++i)
{
thiz->outputBuffer[i] = (char)toupper(thiz->outputBuffer[i]);
}
}
}
static void VXBaseInstructionFormatter_OutputAppendFormatted(
VXBaseInstructionFormatterContext *ctx, char const *format, ...)
{
VXBaseInstructionFormatter *thiz = VXBaseInstructionFormatter_thiz(ctx);
va_list arguments;
va_start(arguments, format);
// Get the buffer size
size_t bufLen = thiz->outputBufferCapacity;
// Decrease the offset by one, to exclude already existing null-terminator chars in the
// output buffer
size_t offset = (thiz->outputStringLen) ? thiz->outputStringLen - 1 : 0;
// Resize the output buffer on demand and add some extra space to improve the performance
if ((bufLen - thiz->outputStringLen) < 256)
{
bufLen = bufLen + 512;
thiz->outputBuffer = realloc(thiz->outputBuffer, bufLen);
thiz->outputBufferCapacity = bufLen;
}
int strLen = 0;
do
{
// If the formatted text did not fit in the output buffer, resize it, and try again
if (strLen < 0)
{
thiz->outputBufferCapacity = bufLen + 512;
thiz->outputBuffer = realloc(thiz->outputBuffer, thiz->outputBufferCapacity);
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, format, arguments);
return;
}
// Write the formatted text to the output buffer
assert((bufLen - offset) > 0);
strLen = vsnprintf(&thiz->outputBuffer[offset], bufLen - offset, format, arguments);
} while (strLen < 0);
// Increase the string length
thiz->outputStringLen = offset + strLen + 1;
// Convert to uppercase
if (thiz->outputUppercase)
{
for (size_t i = offset; i < thiz->outputStringLen - 1; ++i)
{
thiz->outputBuffer[i] = (char)toupper(thiz->outputBuffer[i]);
}
}
va_end(arguments);
}
static void VXBaseInstructionFormatter_OutputAppendAddress(
VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info, uint64_t address,
bool resolveSymbols)
{
uint64_t offset = 0;
const char* name = NULL;
if (resolveSymbols)
{
name = VXBaseInstructionFormatter_ResolveSymbol(ctx, info, address, &offset);
}
if (name)
{
if (offset)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%s+%.2llX", name, offset);
}
else
{
VXBaseInstructionFormatter_OutputAppend(ctx, name);
}
}
else
{
if (info->flags & IF_DISASSEMBLER_MODE_16)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%.4X", address);
}
else if (info->flags & IF_DISASSEMBLER_MODE_32)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%.8lX", address);
}
else if (info->flags & IF_DISASSEMBLER_MODE_64)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%.16llX", address);
}
else
{
assert(0);
}
}
}
static void VXBaseInstructionFormatter_OutputAppendImmediate(
VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info,
const VXOperandInfo *operand, bool resolveSymbols)
{
assert(operand->type == OPTYPE_IMMEDIATE);
uint64_t value = 0;
if (operand->signed_lval && (operand->size != info->operand_mode))
{
if (operand->size == 8)
{
value = (int64_t)operand->lval.sbyte;
}
else
{
assert(operand->size == 32);
value = (int64_t)operand->lval.sdword;
}
if (info->operand_mode < 64)
{
value = value & ((1ull << info->operand_mode) - 1ull);
}
}
else
{
switch (operand->size)
{
case 8:
value = operand->lval.ubyte;
break;
case 16:
value = operand->lval.uword;
break;
case 32:
value = operand->lval.udword;
break;
case 64:
value = operand->lval.uqword;
break;
default:
assert(0);
}
}
uint64_t offset = 0;
const char* name = NULL;
if (resolveSymbols)
{
name = VXBaseInstructionFormatter_ResolveSymbol(ctx, info, value, &offset);
}
if (name)
{
if (offset)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%s+%.2llX", name, offset);
}
else
{
VXBaseInstructionFormatter_OutputAppend(ctx, name);
}
}
else
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%.2llX", value);
}
}
static void VXBaseInstructionFormatter_OutputAppendDisplacement(
VXBaseInstructionFormatterContext *ctx, const VXOperandInfo *operand)
{
assert(operand->offset > 0);
if ((operand->base == REG_NONE) && (operand->index == REG_NONE))
{
// Assume the displacement value is unsigned
assert(operand->scale == 0);
assert(operand->offset != 8);
uint64_t value = 0;
switch (operand->offset)
{
case 16:
value = operand->lval.uword;
break;
case 32:
value = operand->lval.udword;
break;
case 64:
value = operand->lval.uqword;
break;
default:
assert(0);
}
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%.2llX", value);
}
else
{
// The displacement value might be negative
assert(operand->offset != 64);
int64_t value = 0;
switch (operand->offset)
{
case 8:
value = operand->lval.sbyte;
break;
case 16:
value = operand->lval.sword;
break;
case 32:
value = operand->lval.sdword;
break;
default:
assert(0);
}
if (value < 0)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "-%.2lX", -value);
} else
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%s%.2lX",
(operand->base != REG_NONE || operand->index != REG_NONE) ? "+" : "", value);
}
}
}
/* VXIntelInstructionFormatter ----------------------------------------------------------------- */
static void VXIntelInstructionFormatter_Construct(VXBaseInstructionFormatterContext *ctx,
VXBaseSymbolResolverContext* symbolResolver)
{
VXBaseInstructionFormatter_Construct(ctx, symbolResolver);
VXIntelInstructionFormatter *thiz = VXIntelInstructionFormatter_thiz(ctx);
thiz->super.destruct = &VXIntelInstructionFormatter_Destruct;
thiz->super.internalFormat = &VXIntelInstructionFormatter_InternalFormatInstruction;
}
static void VXIntelInstructionFormatter_Destruct(VXBaseInstructionFormatterContext *ctx)
{
VXBaseInstructionFormatter_Destruct(ctx);
}
VXBaseInstructionFormatterContext* VXIntelInstructionFormatter_Create(void)
{
return VXIntelInstructionFormatter_CreateEx(NULL);
}
VXBaseInstructionFormatterContext* VXIntelInstructionFormatter_CreateEx(
VXBaseSymbolResolverContext *resolver)
{
VXIntelInstructionFormatter *thiz = malloc(sizeof(VXIntelInstructionFormatter));
VXBaseInstructionFormatterContext *ctx = malloc(sizeof(VXBaseInstructionFormatterContext));
if (!thiz || !ctx)
{
if (thiz)
{
free(thiz);
}
if (ctx)
{
free(ctx);
}
return NULL;
}
ctx->d.type = TYPE_INTELINSTRUCTIONFORMATTER;
ctx->d.ptr = thiz;
VXIntelInstructionFormatter_Construct(ctx, resolver);
return ctx;
}
static void VXIntelInstructionFormatter_OutputAppendOperandCast(
VXBaseInstructionFormatterContext *ctx, const VXOperandInfo *operand)
{
switch(operand->size)
{
case 8:
VXBaseInstructionFormatter_OutputAppend(ctx, "byte ptr " );
break;
case 16:
VXBaseInstructionFormatter_OutputAppend(ctx, "word ptr " );
break;
case 32:
VXBaseInstructionFormatter_OutputAppend(ctx, "dword ptr ");
break;
case 64:
VXBaseInstructionFormatter_OutputAppend(ctx, "qword ptr ");
break;
case 80:
VXBaseInstructionFormatter_OutputAppend(ctx, "tword ptr ");
break;
case 128:
VXBaseInstructionFormatter_OutputAppend(ctx, "oword ptr ");
break;
case 256:
VXBaseInstructionFormatter_OutputAppend(ctx, "yword ptr ");
break;
default:
break;
}
}
static void VXIntelInstructionFormatter_FormatOperand(VXBaseInstructionFormatterContext *ctx,
const VXInstructionInfo *info, const VXOperandInfo *operand)
{
switch (operand->type)
{
case OPTYPE_REGISTER:
VXBaseInstructionFormatter_OutputAppend(ctx,
VXBaseInstructionFormatter_RegisterToString(ctx, operand->base));
break;
case OPTYPE_MEMORY:
if (info->flags & IF_PREFIX_SEGMENT)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx,
"%s:", VXBaseInstructionFormatter_RegisterToString(ctx, info->segment));
}
VXBaseInstructionFormatter_OutputAppend(ctx, "[");
if (operand->base == REG_RIP)
{
// TODO: Add option
VXBaseInstructionFormatter_OutputAppendAddress(
ctx, info, VXCalcAbsoluteTarget(info, operand), true);
}
else
{
if (operand->base != REG_NONE)
{
VXBaseInstructionFormatter_OutputAppend(ctx,
VXBaseInstructionFormatter_RegisterToString(ctx, operand->base));
}
if (operand->index != REG_NONE)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%s%s",
operand->base != REG_NONE ? "+" : "",
VXBaseInstructionFormatter_RegisterToString(ctx, operand->index));
if (operand->scale)
{
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "*%d", operand->scale);
}
}
if (operand->offset)
{
VXBaseInstructionFormatter_OutputAppendDisplacement(ctx, operand);
}
}
VXBaseInstructionFormatter_OutputAppend(ctx, "]");
break;
case OPTYPE_POINTER:
// TODO: resolve symbols
switch (operand->size)
{
case 32:
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "word %.4X:%.4X",
operand->lval.ptr.seg, operand->lval.ptr.off & 0xFFFF);
break;
case 48:
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "dword %.4X:%.8lX",
operand->lval.ptr.seg, operand->lval.ptr.off);
break;
default:
assert(0);
}
break;
case OPTYPE_IMMEDIATE:
{
VXBaseInstructionFormatter_OutputAppendImmediate(ctx, info, operand, true);
}
break;
case OPTYPE_REL_IMMEDIATE:
{
if (operand->size == 8)
{
VXBaseInstructionFormatter_OutputAppend(ctx, "short ");
}
VXBaseInstructionFormatter_OutputAppendAddress(ctx, info,
VXCalcAbsoluteTarget(info, operand), true);
}
break;
case OPTYPE_CONSTANT:
VXBaseInstructionFormatter_OutputAppendFormatted(ctx, "%.2X", operand->lval.udword);
break;
default:
assert(0);
break;
}
}
static void VXIntelInstructionFormatter_InternalFormatInstruction(
VXBaseInstructionFormatterContext *ctx, const VXInstructionInfo *info)
{
// Append string prefixes
if (info->flags & IF_PREFIX_LOCK)
{
VXBaseInstructionFormatter_OutputAppend(ctx, "lock ");
}
if (info->flags & IF_PREFIX_REP)
{
VXBaseInstructionFormatter_OutputAppend(ctx, "rep ");
}
else if (info->flags & IF_PREFIX_REPNE)
{
VXBaseInstructionFormatter_OutputAppend(ctx, "repne ");
}
// Append the instruction mnemonic
VXBaseInstructionFormatter_OutputAppend(ctx, VXGetInstructionMnemonicString(info->mnemonic));
// Append the first operand
if (info->operand[0].type != OPTYPE_NONE)
{
VXBaseInstructionFormatter_OutputAppend(ctx, " ");
bool cast = false;
if (info->operand[0].type == OPTYPE_MEMORY)
{
if (info->operand[1].type == OPTYPE_IMMEDIATE ||
info->operand[1].type == OPTYPE_CONSTANT ||
info->operand[1].type == OPTYPE_NONE ||
(info->operand[0].size != info->operand[1].size))
{
cast = true;
}
else if (info->operand[1].type == OPTYPE_REGISTER && info->operand[1].base == REG_CL)
{
switch (info->mnemonic)
{
case MNEM_RCL:
case MNEM_ROL:
case MNEM_ROR:
case MNEM_RCR:
case MNEM_SHL:
case MNEM_SHR:
case MNEM_SAR:
cast = true;
break;
default:
break;
}
}
}
if (cast)
{
VXIntelInstructionFormatter_OutputAppendOperandCast(ctx, &info->operand[0]);
}
VXIntelInstructionFormatter_FormatOperand(ctx, info, &info->operand[0]);
}
// Append the second operand
if (info->operand[1].type != OPTYPE_NONE)
{
VXBaseInstructionFormatter_OutputAppend(ctx, ", ");
bool cast = false;
if (info->operand[1].type == OPTYPE_MEMORY &&
info->operand[0].size != info->operand[1].size &&
((info->operand[0].type != OPTYPE_REGISTER) ||
((info->operand[0].base != REG_ES) &&
(info->operand[0].base != REG_CS) &&
(info->operand[0].base != REG_SS) &&
(info->operand[0].base != REG_DS) &&
(info->operand[0].base != REG_FS) &&
(info->operand[0].base != REG_GS))))
{
cast = true;
}
if (cast)
{
VXIntelInstructionFormatter_OutputAppendOperandCast(ctx, &info->operand[1]);
}
VXIntelInstructionFormatter_FormatOperand(ctx, info, &info->operand[1]);
}
// Append the third operand
if (info->operand[2].type != OPTYPE_NONE)
{
VXBaseInstructionFormatter_OutputAppend(ctx, ", ");
bool cast = false;
if (info->operand[2].type == OPTYPE_MEMORY &&
(info->operand[2].size != info->operand[1].size))
{
cast = true;
}
if (cast)
{
VXIntelInstructionFormatter_OutputAppendOperandCast(ctx, &info->operand[2]);
}
VXIntelInstructionFormatter_FormatOperand(ctx, info, &info->operand[2]);
}
// Append the fourth operand
if (info->operand[3].type != OPTYPE_NONE)
{
VXBaseInstructionFormatter_OutputAppend(ctx, ", ");
VXIntelInstructionFormatter_FormatOperand(ctx, info, &info->operand[3]);
}
}
/* --------------------------------------------------------------------------------------------- */
/* ============================================================================================= */
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