when compiling a program with gcc or any other compiler, can I somehow make the compiler generate a map of instructions in memory ??
something like:
0000: First Instruction
0001: Second Instruction
1000: Third Instruction (after a jump for example)
I would like to use these addresses as a pattern to test a design of an instruction cache. I don't care what instructions are compiled or anything like that, just the addresses of these instruction. is this possible?
The easiest way has to be to use objdump on your compiled output. For instance:
$ objdump -d /tmp/test
/tmp/test: file format elf64-x86-64
Disassembly of section .text:
0000000000400410 <_start>:
400410: 31 ed xor %ebp,%ebp
400412: 49 89 d1 mov %rdx,%r9
400415: 5e pop %rsi
400416: 48 89 e2 mov %rsp,%rdx
400419: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp
40041d: 50 push %rax
40041e: 54 push %rsp
40041f: 49 c7 c0 b0 05 40 00 mov $0x4005b0,%r8
400426: 48 c7 c1 20 05 40 00 mov $0x400520,%rcx
40042d: 48 c7 c7 fa 04 40 00 mov $0x4004fa,%rdi
400434: e8 b7 ff ff ff callq 4003f0 <__libc_start_main@plt>
400439: f4 hlt
40043a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
And so on. If you want to only have the addresses, just filter them out with sed or something.