$ cat docker-compose.yml
services:
app:
image: amd64/gcc:13.1.0
working_dir: /usr/src/myapp
volumes:
- $PWD:/usr/src/myapp
$ cat main.c
int main() {
return 1;
}
$ cat Makefile
SRC = main.c
EXE = a.out
PREFIX = docker compose run --rm app
default: run
clean:
$(RM) $(RMF) $(EXE)
run: build
$(PREFIX) ./$(EXE)
build: $(EXE)
$(EXE): $(SRC)
$(PREFIX) gcc -g $< -o $@
disassemble: $(EXE)
$(PREFIX) objdump --disassemble=main $(EXE)
objdump: $(EXE)
$(PREFIX) od --endian=big -x $(EXE)
$ make disassemble
docker compose run --rm app objdump --disassemble=main a.out
[+] Building 0.0s (0/0)
[+] Building 0.0s (0/0)
a.out: file format elf64-x86-64
Disassembly of section .init:
Disassembly of section .text:
0000000000401106 <main>:
401106: 55 push %rbp
401107: 48 89 e5 mov %rsp,%rbp
40110a: b8 01 00 00 00 mov $0x1,%eax
40110f: 5d pop %rbp
401110: c3 ret
Disassembly of section .fini:
$ make objdump|grep -A1 -E '55.?48.?89'
0010320 f30f 1efa 803d 352f 0000 0075 1355 4889
0010340 e5e8 7aff ffff c605 232f 0000 015d c390
--
0010400 f30f 1efa eb8a 5548 89e5 b801 0000 005d
0010420 c300 0000 4883 ec08 4883 c408 c300 0000
$ cat hello.c
int main() {
printf("Hello, world!\n");
}
$ cat Makefile.hello
SRC = rodata_str.c
EXE = rodata_str
PREFIX = docker compose run --rm app
default: run
clean:
$(RM) $(RMF) $(EXE)
run: build
$(PREFIX) ./$(EXE)
build: $(EXE)
rodata_str: rodata_str.c
$(PREFIX) gcc -g $< -o $@
disassemble: $(EXE)
$(PREFIX) objdump --disassemble=main $(EXE)
rodata: $(EXE)
$(PREFIX) objdump -s -j .rodata $(EXE)
objdump: $(EXE)
$(PREFIX) od --endian=big -x -c $(EXE) | grep -A3 -E '6c.?6c'
$ make -f Makefile.hello disassemble
docker compose run --rm app objdump --disassemble=main rodata_str
[+] Building 0.0s (0/0)
[+] Building 0.0s (0/0)
rodata_str: file format elf64-x86-64
Disassembly of section .init:
Disassembly of section .plt:
Disassembly of section .text:
0000000000401126 <main>:
401126: 55 push %rbp
401127: 48 89 e5 mov %rsp,%rbp
40112a: bf 04 20 40 00 mov $0x402004,%edi
40112f: e8 fc fe ff ff call 401030 <puts@plt>
401134: b8 00 00 00 00 mov $0x0,%eax
401139: 5d pop %rbp
40113a: c3 ret
Disassembly of section .fini:
$ make -f Makefile.hello rodata
docker compose run --rm app objdump -s -j .rodata rodata_str
[+] Building 0.0s (0/0)
[+] Building 0.0s (0/0)
rodata_str: file format elf64-x86-64
Contents of section .rodata:
402000 01000200 48656c6c 6f2c2077 6f726c64 ....Hello, world
402010 2100 !. !.
$ make -f Makefile.hello objdump
docker compose run --rm app od --endian=big -x -c rodata_str | grep -A3 -E '6c.?6c'
0020000 0100 0200 4865 6c6c 6f2c 2077 6f72 6c64
001 \0 002 \0 H e l l o , w o r l d
0020020 2100 0000 011b 033b 2800 0000 0400 0000
! \0 \0 \0 001 033 003 ; ( \0 \0 \0 004 \0 \0 \0
