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Functions to calculate the size for the disassembly buffer

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This commit is contained in:
angie 2022-06-04 02:42:17 -04:00
parent cedf56ca36
commit 7411aadae3
3 changed files with 73 additions and 2 deletions
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6
include/instructions/RabbitizerInstr.h
View File

@ -65,8 +65,14 @@ bool RabbitizerInstr_IsNop(const RabbitizerInstr *self);
uint32_t RabbitizerInstr_GetBranchOffset(const RabbitizerInstr *self);
size_t RabbitizerInstr_GetSizeForBufferInstrDisasm(const RabbitizerInstr *self, size_t immOverrideLength);
size_t RabbitizerInstr_DisassembleInstruction(const RabbitizerInstr *self, char *dst, const char *immOverride, size_t immOverrideLength);
size_t RabbitizerInstr_GetSizeForBufferDataDisasm(const RabbitizerInstr *self);
size_t RabbitizerInstr_DisassembleAsData(const RabbitizerInstr *self, char *dst);
size_t RabbitizerInstr_GetSizeForBuffer(const RabbitizerInstr *self, size_t immOverrideLength);
size_t RabbitizerInstr_Disassemble(const RabbitizerInstr *self, char *dst, const char *immOverride, size_t immOverrideLength);
#endif

60
src/instructions/RabbitizerInstr_Disassemble.c
View File

@ -228,6 +228,36 @@ const OperandCallback instrOpercandCallbacks[] = {
};
size_t RabbitizerInstr_GetSizeForBufferInstrDisasm(const RabbitizerInstr *self, size_t immOverrideLength) {
size_t totalSize = 0;
size_t opcodeNameLength;
opcodeNameLength = strlen(RabbitizerInstr_GetOpcodeName(self));
totalSize += opcodeNameLength;
if (self->descriptor->operands[0] == RABBITIZER_REGISTER_TYPE_INVALID) {
// There are no operands
return totalSize;
}
totalSize += self->extraLjustWidthOpcode;
totalSize++;
for (size_t i = 0; i < ARRAY_COUNT(self->descriptor->operands) && self->descriptor->operands[i] != RABBITIZER_REGISTER_TYPE_INVALID; i++) {
if (i != 0) {
totalSize += 2;
}
// A bit arbitrary, but no operand should be longer than 25 characters
totalSize += 25;
totalSize += immOverrideLength;
}
return totalSize;
}
size_t RabbitizerInstr_DisassembleInstruction(const RabbitizerInstr *self, char *dst, const char *immOverride, size_t immOverrideLength) {
size_t totalSize = 0;
const char *opcodeName;
@ -288,6 +318,17 @@ size_t RabbitizerInstr_DisassembleInstruction(const RabbitizerInstr *self, char
}
size_t RabbitizerInstr_GetSizeForBufferDataDisasm(const RabbitizerInstr *self) {
size_t totalSize = 0;
totalSize += strlen(".word");
totalSize += /*InstructionConfig.OPCODE_LJUST +*/ self->extraLjustWidthOpcode;
totalSize += 11;
return totalSize;
}
size_t RabbitizerInstr_DisassembleAsData(const RabbitizerInstr *self, char *dst) {
size_t totalSize = 0;
size_t tempSize;
@ -361,6 +402,25 @@ bool RabbitizerInstr_MustDisasmAsData(const RabbitizerInstr *self) {
size_t RabbitizerInstr_GetSizeForBuffer(const RabbitizerInstr *self, size_t immOverrideLength) {
if (!RabbitizerInstr_IsImplemented(self) || RabbitizerInstr_MustDisasmAsData(self)) {
size_t totalSize = 0;
totalSize += RabbitizerInstr_GetSizeForBufferDataDisasm(self);
/* if (InstructionConfig.UNKNOWN_INSTR_COMMENT) */ {
totalSize += 40;
totalSize += 3;
totalSize += RabbitizerInstr_GetSizeForBufferInstrDisasm(self, immOverrideLength);
}
return totalSize;
}
return RabbitizerInstr_GetSizeForBufferInstrDisasm(self,immOverrideLength);
}
size_t RabbitizerInstr_Disassemble(const RabbitizerInstr *self, char *dst, const char *immOverride, size_t immOverrideLength) {
if (!RabbitizerInstr_IsImplemented(self) || RabbitizerInstr_MustDisasmAsData(self)) {
size_t totalSize = 0;

9
test.c
View File

@ -3,12 +3,13 @@
#include "instructions/RabbitizerInstr.h"
#include "stdio.h"
#include <stdio.h>
#include <stdlib.h>
int main() {
uint32_t word = 0x8D4A7E18;
RabbitizerInstr instr;
char buffer[0x1000]; // huge buffer for testing purposes
char *buffer;
RabbitizerInstr_Init(&instr, word);
@ -16,10 +17,14 @@ int main() {
instr.extraLjustWidthOpcode += 10;
buffer = malloc(RabbitizerInstr_GetSizeForBuffer(&instr, 0) + 1);
RabbitizerInstr_Disassemble(&instr, buffer, NULL, 0);
printf("%08X: %s\n", word, buffer);
free(buffer);
RabbitizerInstr_Destroy(&instr);
return 0;