diff options
| -rw-r--r-- | miasm2/os_dep/linux_stdlib.py | 47 | ||||
| -rwxr-xr-x | test/test_all.py | 2 |
2 files changed, 40 insertions, 9 deletions
diff --git a/miasm2/os_dep/linux_stdlib.py b/miasm2/os_dep/linux_stdlib.py index d0e281a1..9e1cc9db 100644 --- a/miasm2/os_dep/linux_stdlib.py +++ b/miasm2/os_dep/linux_stdlib.py @@ -1,5 +1,6 @@ #-*- coding:utf-8 -*- +import struct from sys import stdout from string import printable @@ -31,21 +32,51 @@ def xxx___libc_start_main(jitter): Note: - init, fini, rtld_fini are ignored - return address is forced to ABORT_ADDR, to avoid calling abort/hlt/... + - in powerpc, signature is: + + int __libc_start_main (int argc, char **argv, char **ev, ElfW (auxv_t) * + auxvec, void (*rtld_fini) (void), struct startup_info + *stinfo, char **stack_on_entry) """ global ABORT_ADDR - ret_ad, args = jitter.func_args_systemv(["main", "argc", "ubp_av", "init", - "fini", "rtld_fini", "stack_end"]) + if jitter.arch.name == "ppc32": + ret_ad, args = jitter.func_args_systemv( + ["argc", "argv", "ev", "aux_vec", "rtld_fini", "st_info", + "stack_on_entry"] + ) + + # Mimic glibc implementation + if args.stack_on_entry != 0: + argc = struct.unpack(">I", + jitter.vm.get_mem(args.stack_on_entry, 4))[0] + argv = args.stack_on_entry + 4 + envp = argv + ((argc + 1) * 4) + else: + argc = args.argc + argv = args.argv + envp = args.ev + # sda_base, main, init, fini + _, main, _, _ = struct.unpack(">IIII", + jitter.vm.get_mem(args.st_info, 4 * 4)) + + else: + ret_ad, args = jitter.func_args_systemv( + ["main", "argc", "ubp_av", "init", "fini", "rtld_fini", "stack_end"] + ) + + main = args.main + # done by __libc_init_first + size = jitter.ir_arch.pc.size / 8 + argc = args.argc + argv = args.ubp_av + envp = argv + (args.argc + 1) * size - # done by __libc_init_first - size = jitter.ir_arch.pc.size / 8 - argv = args.ubp_av - envp = argv + (args.argc + 1) * size # Call int main(int argc, char** argv, char** envp) - jitter.func_ret_systemv(args.main) + jitter.func_ret_systemv(main) ret_ad = ABORT_ADDR - jitter.func_prepare_systemv(ret_ad, args.argc, argv, envp) + jitter.func_prepare_systemv(ret_ad, argc, argv, envp) return True diff --git a/test/test_all.py b/test/test_all.py index 259a1eaa..fa27b787 100755 --- a/test/test_all.py +++ b/test/test_all.py @@ -686,7 +686,7 @@ for script, dep in [(["x86_32.py", Example.get_sample("x86_32_sc.bin")], []), Example.get_sample("md5_aarch64l"), "--mimic-env"], []), (["sandbox_elf_ppc32.py", - Example.get_sample("md5_ppc32b"), "-a", "0x1000087C"], + Example.get_sample("md5_ppc32b"), "--mimic-env"], []), (["msp430.py", Example.get_sample("msp430_sc.bin"), "0"], [test_msp430]), |