yuzu/breakpad
1
0
Fork 0
mirror of https://github.com/yuzu-emu/breakpad.git synced 2025-03-06 18:29:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

Simplify ELF parser code.

Browse source 
The layout of Elf32_Nhdr and Elf64_Nhdr is the same, so remove
templating and code that extracts the elfclass from the ELF file.

Testing: "make check" and breakpad_unittests when patched into
chromium.

Bug: chromium:716484
Change-Id: I41442cfff48afc6ae1a5b604d22b67550a910376
Reviewed-on: https://chromium-review.googlesource.com/514450
Reviewed-by: Mike Frysinger <vapier@chromium.org>
This commit is contained in:
Peter Collingbourne 2017-05-24 16:25:09 -07:00 committed by Mike Frysinger
parent 77305c3ae6
commit fbfd41af5f
4 changed files with 17 additions and 40 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
src/client/linux/minidump_writer/linux_dumper.cc
View file

@ -352,17 +352,16 @@ bool ElfFileSoNameFromMappedFile(
const void* segment_start;
size_t segment_size;
int elf_class;
if (!FindElfSection(elf_base, ".dynamic", SHT_DYNAMIC,
&segment_start, &segment_size, &elf_class)) {
if (!FindElfSection(elf_base, ".dynamic", SHT_DYNAMIC, &segment_start,
&segment_size)) {
// No dynamic section
return false;
}
const void* dynstr_start;
size_t dynstr_size;
if (!FindElfSection(elf_base, ".dynstr", SHT_STRTAB,
&dynstr_start, &dynstr_size, &elf_class)) {
if (!FindElfSection(elf_base, ".dynstr", SHT_STRTAB, &dynstr_start,
&dynstr_size)) {
// No dynstr section
return false;
}

14
src/common/linux/elfutils.cc
View file

@ -122,8 +122,7 @@ bool FindElfSection(const void *elf_mapped_base,
const char *section_name,
uint32_t section_type,
const void **section_start,
size_t *section_size,
int *elfclass) {
size_t *section_size) {
assert(elf_mapped_base);
assert(section_start);
assert(section_size);
@ -135,10 +134,6 @@ bool FindElfSection(const void *elf_mapped_base,
return false;
int cls = ElfClass(elf_mapped_base);
if (elfclass) {
*elfclass = cls;
}
const char* elf_base =
static_cast<const char*>(elf_mapped_base);
@ -158,8 +153,7 @@ bool FindElfSection(const void *elf_mapped_base,
bool FindElfSegment(const void *elf_mapped_base,
uint32_t segment_type,
const void **segment_start,
size_t *segment_size,
int *elfclass) {
size_t *segment_size) {
assert(elf_mapped_base);
assert(segment_start);
assert(segment_size);
@ -171,10 +165,6 @@ bool FindElfSegment(const void *elf_mapped_base,
return false;
int cls = ElfClass(elf_mapped_base);
if (elfclass) {
*elfclass = cls;
}
const char* elf_base =
static_cast<const char*>(elf_mapped_base);

12
src/common/linux/elfutils.h
View file

@ -81,14 +81,12 @@ int ElfClass(const void* elf_base);
// Attempt to find a section named |section_name| of type |section_type|
// in the ELF binary data at |elf_mapped_base|. On success, returns true
// and sets |*section_start| to point to the start of the section data,
// and |*section_size| to the size of the section's data. If |elfclass|
// is not NULL, set |*elfclass| to the ELF file class.
// and |*section_size| to the size of the section's data.
bool FindElfSection(const void *elf_mapped_base,
const char *section_name,
uint32_t section_type,
const void **section_start,
size_t *section_size,
int *elfclass);
size_t *section_size);
// Internal helper method, exposed for convenience for callers
// that already have more info.
@ -104,13 +102,11 @@ FindElfSectionByName(const char* name,
// Attempt to find the first segment of type |segment_type| in the ELF
// binary data at |elf_mapped_base|. On success, returns true and sets
// |*segment_start| to point to the start of the segment data, and
// and |*segment_size| to the size of the segment's data. If |elfclass|
// is not NULL, set |*elfclass| to the ELF file class.
// and |*segment_size| to the size of the segment's data.
bool FindElfSegment(const void *elf_mapped_base,
uint32_t segment_type,
const void **segment_start,
size_t *segment_size,
int *elfclass);
size_t *segment_size);
// Convert an offset from an Elf header into a pointer to the mapped
// address in the current process. Takes an extra template parameter

22
src/common/linux/file_id.cc
View file

@ -61,10 +61,11 @@ FileID::FileID(const char* path) : path_(path) {}
// These functions are also used inside the crashed process, so be safe
// and use the syscall/libc wrappers instead of direct syscalls or libc.
template<typename ElfClass>
static bool ElfClassBuildIDNoteIdentifier(const void *section, size_t length,
wasteful_vector<uint8_t>& identifier) {
typedef typename ElfClass::Nhdr Nhdr;
static_assert(sizeof(ElfClass32::Nhdr) == sizeof(ElfClass64::Nhdr),
"Elf32_Nhdr and Elf64_Nhdr should be the same");
typedef typename ElfClass32::Nhdr Nhdr;
const void* section_end = reinterpret_cast<const char*>(section) + length;
const Nhdr* note_header = reinterpret_cast<const Nhdr*>(section);
@ -96,25 +97,16 @@ static bool FindElfBuildIDNote(const void* elf_mapped_base,
wasteful_vector<uint8_t>& identifier) {
void* note_section;
size_t note_size;
int elfclass;
if ((!FindElfSegment(elf_mapped_base, PT_NOTE,
(const void**)&note_section, &note_size, &elfclass) ||
(const void**)&note_section, &note_size) ||
note_size == 0) &&
(!FindElfSection(elf_mapped_base, ".note.gnu.build-id", SHT_NOTE,
(const void**)&note_section, &note_size, &elfclass) ||
(const void**)&note_section, &note_size) ||
note_size == 0)) {
return false;
}
if (elfclass == ELFCLASS32) {
return ElfClassBuildIDNoteIdentifier<ElfClass32>(note_section, note_size,
identifier);
} else if (elfclass == ELFCLASS64) {
return ElfClassBuildIDNoteIdentifier<ElfClass64>(note_section, note_size,
identifier);
}
return false;
return ElfClassBuildIDNoteIdentifier(note_section, note_size, identifier);
}
// Attempt to locate the .text section of an ELF binary and generate
@ -126,7 +118,7 @@ static bool HashElfTextSection(const void* elf_mapped_base,
void* text_section;
size_t text_size;
if (!FindElfSection(elf_mapped_base, ".text", SHT_PROGBITS,
(const void**)&text_section, &text_size, NULL) ||
(const void**)&text_section, &text_size) ||
text_size == 0) {
return false;
}