diff options
Diffstat (limited to 'libcorkscrew/arch-x86/ptrace-x86.c')
| -rwxr-xr-x[-rw-r--r--] | libcorkscrew/arch-x86/ptrace-x86.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/libcorkscrew/arch-x86/ptrace-x86.c b/libcorkscrew/arch-x86/ptrace-x86.c index 07cfd3a..9c49b93 100644..100755 --- a/libcorkscrew/arch-x86/ptrace-x86.c +++ b/libcorkscrew/arch-x86/ptrace-x86.c @@ -19,11 +19,44 @@ #include "../ptrace-arch.h" +#include <stddef.h> +#include <elf.h> #include <cutils/log.h> -void load_ptrace_map_info_data_arch(pid_t pid __attribute__((unused)), - map_info_t* mi __attribute__((unused)), - map_info_data_t* data __attribute__((unused))) { +static void load_eh_frame_hdr(pid_t pid, map_info_t* mi, uintptr_t *eh_frame_hdr) { + uint32_t elf_phoff; + uint32_t elf_phentsize_ehsize; + uint32_t elf_shentsize_phnum; + if (try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_phoff), &elf_phoff) + && try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_ehsize), + &elf_phentsize_ehsize) + && try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_phnum), + &elf_shentsize_phnum)) { + uint32_t elf_phentsize = elf_phentsize_ehsize >> 16; + uint32_t elf_phnum = elf_shentsize_phnum & 0xffff; + for (uint32_t i = 0; i < elf_phnum; i++) { + uintptr_t elf_phdr = mi->start + elf_phoff + i * elf_phentsize; + uint32_t elf_phdr_type; + if (!try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_type), &elf_phdr_type)) { + break; + } + if (elf_phdr_type == PT_GNU_EH_FRAME) { + uint32_t elf_phdr_offset; + if (!try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_offset), + &elf_phdr_offset)) { + break; + } + *eh_frame_hdr = mi->start + elf_phdr_offset; + ALOGV("Parsed .eh_frame_hdr info for %s: start=0x%08x", mi->name, *eh_frame_hdr); + return; + } + } + } + *eh_frame_hdr = 0; +} + +void load_ptrace_map_info_data_arch(pid_t pid, map_info_t* mi, map_info_data_t* data) { + load_eh_frame_hdr(pid, mi, &data->eh_frame_hdr); } void free_ptrace_map_info_data_arch(map_info_t* mi __attribute__((unused)), |