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disassemble: approximate output formatting of objdump #59

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Jun 12, 2024
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disassemble: approximate output formatting of objdump #59

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43 changes: 33 additions & 10 deletions disassemble/disassemble.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,11 +13,17 @@
#include "InstructionDecoder.h"

#include <iostream>
#include <iomanip>
using namespace std;
using namespace Dyninst;
using namespace ParseAPI;
using namespace InstructionAPI;

// How many bytes of the instruction hex dump should be printed
// on the first line. The remaining will go to the second line
// on the assumption that an instruction is at most 15 bytes long.
static const int l1_width = 7;
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int main(int argc, char** argv) {
if(argc != 2) {
printf("Usage: %s <binary path>\n", argv[0]);
Expand Down Expand Up @@ -48,30 +54,47 @@ int main(int argc, char** argv) {
cout << error;
return -1;
}
auto fit = all.begin();
Function* f = *fit;
// create an Instruction decoder which will convert the binary opcodes to strings
InstructionDecoder decoder(f->isrc()->getPtrToInstruction(f->addr()),
InstructionDecoder::maxInstructionLength, f->region()->getArch());
for(; fit != all.end(); ++fit) {
InstructionDecoder decoder((const void *)nullptr, 1, sts->getArch());
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for(auto fit = all.begin(); fit != all.end(); ++fit) {
Function* f = *fit;
// get address of entry point for current function
Address crtAddr = f->addr();
int instr_count = 0;
instr = decoder.decode((unsigned char*)f->isrc()->getPtrToInstruction(crtAddr));
auto fbl = f->blocks().end();
fbl--;
Block* b = *fbl;
Address lastAddr = b->end();
// if current function has zero instructions, d o n t output it
if(crtAddr == lastAddr)
continue;
cout << "\n\n\"" << f->name() << "\" :";
cout << "\n\n" << hex << setfill('0') << setw(2 * sts->getAddressWidth()) << f->addr() << " <" << f->name() << ">:\n";
while(crtAddr < lastAddr) {
// decode current instruction
instr = decoder.decode((unsigned char*)f->isrc()->getPtrToInstruction(crtAddr));
cout << "\n" << hex << crtAddr;
cout << ": \"" << instr.format() << "\"";
const unsigned char *instr_ptr = (const unsigned char *)f->isrc()->getPtrToInstruction(crtAddr);
instr = decoder.decode(instr_ptr);

// failed to decode the instruction
if (instr.size() == 0)
break;

// pretty print it
cout << hex << setfill(' ') << setw(8) << crtAddr << ": ";
for (size_t i = 0; i < instr.size() && i < l1_width; i++) {
cout << hex << setfill('0') << setw(2) << (unsigned)instr_ptr[i] << " ";
}
for (size_t i = min(instr.size(), (size_t)l1_width); i < 8; i++) {
cout << " ";
}
cout << instr.format() << "\n";
if (instr.size() > l1_width) {
cout << hex << setfill(' ') << setw(8) << crtAddr + l1_width << ": ";
for (size_t i = l1_width; i < instr.size(); i++) {
cout << hex << setfill('0') << setw(2) << (unsigned)instr_ptr[i] << " ";
}
cout << "\n";
}

// go to the address of the next instruction
crtAddr += instr.size();
instr_count++;
Expand Down
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