зеркало из https://github.com/mozilla/pjs.git
Bug 747033 - Implement dl_iterate_phdr in the custom linker. r=froydnj
--HG-- rename : mozglue/linker/CustomElf.h => mozglue/linker/Elfxx.h
This commit is contained in:
Mike Hommey
Родитель
554efdb251
Коммит
0f59bb65bb
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@ -291,6 +291,8 @@ CustomElf::GetSymbolPtrInDeps(const char *symbol) const
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return FunctionPtr(__wrap_dlsym);
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if (strcmp(symbol + 2, "addr") == 0)
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return FunctionPtr(__wrap_dladdr);
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if (strcmp(symbol + 2, "_iterate_phdr") == 0)
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return FunctionPtr(__wrap_dl_iterate_phdr);
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} else if (symbol[0] == '_' && symbol[1] == '_') {
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/* Resolve a few C++ ABI specific functions to point to ours */
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#ifdef __ARM_EABI__
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@ -5,234 +5,9 @@
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#ifndef CustomElf_h
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#define CustomElf_h
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/**
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* Android system headers have two different elf.h file. The one under linux/
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* is the most complete.
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*/
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#ifdef ANDROID
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#include <linux/elf.h>
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#else
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#include <elf.h>
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#endif
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#include <endian.h>
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#include "ElfLoader.h"
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#include "Logging.h"
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/**
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* Generic ELF macros for the target system
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*/
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#ifdef HAVE_64BIT_OS
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#define Elf_(type) Elf64_ ## type
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#define ELFCLASS ELFCLASS64
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#define ELF_R_TYPE ELF64_R_TYPE
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#define ELF_R_SYM ELF64_R_SYM
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#ifndef ELF_ST_BIND
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#define ELF_ST_BIND ELF64_ST_BIND
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#endif
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#define PRIxAddr "lx"
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#else
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#define Elf_(type) Elf32_ ## type
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#define ELFCLASS ELFCLASS32
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#define ELF_R_TYPE ELF32_R_TYPE
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#define ELF_R_SYM ELF32_R_SYM
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#ifndef ELF_ST_BIND
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#define ELF_ST_BIND ELF32_ST_BIND
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#endif
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#define PRIxAddr "x"
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#endif
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#ifndef __BYTE_ORDER
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#error Cannot find endianness
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#endif
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define ELFDATA ELFDATA2LSB
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#elif __BYTE_ORDER == __BIG_ENDIAN
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#define ELFDATA ELFDATA2MSB
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#endif
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#ifdef __linux__
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#define ELFOSABI ELFOSABI_LINUX
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#ifdef EI_ABIVERSION
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#define ELFABIVERSION 0
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#endif
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#else
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#error Unknown ELF OSABI
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#endif
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#if defined(__i386__)
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#define ELFMACHINE EM_386
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// Doing this way probably doesn't scale to other architectures
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#define R_ABS R_386_32
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#define R_GLOB_DAT R_386_GLOB_DAT
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#define R_JMP_SLOT R_386_JMP_SLOT
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#define R_RELATIVE R_386_RELATIVE
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#define RELOC(n) DT_REL ## n
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#define UNSUPPORTED_RELOC(n) DT_RELA ## n
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#define STR_RELOC(n) "DT_REL" # n
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#define Reloc Rel
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#elif defined(__x86_64__)
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#define ELFMACHINE EM_X86_64
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#define R_ABS R_X86_64_64
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#define R_GLOB_DAT R_X86_64_GLOB_DAT
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#define R_JMP_SLOT R_X86_64_JUMP_SLOT
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#define R_RELATIVE R_X86_64_RELATIVE
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#define RELOC(n) DT_RELA ## n
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#define UNSUPPORTED_RELOC(n) DT_REL ## n
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#define STR_RELOC(n) "DT_RELA" # n
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#define Reloc Rela
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#elif defined(__arm__)
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#define ELFMACHINE EM_ARM
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#ifndef R_ARM_ABS32
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#define R_ARM_ABS32 2
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#endif
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#ifndef R_ARM_GLOB_DAT
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#define R_ARM_GLOB_DAT 21
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#endif
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#ifndef R_ARM_JUMP_SLOT
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#define R_ARM_JUMP_SLOT 22
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#endif
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#ifndef R_ARM_RELATIVE
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#define R_ARM_RELATIVE 23
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#endif
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#define R_ABS R_ARM_ABS32
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#define R_GLOB_DAT R_ARM_GLOB_DAT
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#define R_JMP_SLOT R_ARM_JUMP_SLOT
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#define R_RELATIVE R_ARM_RELATIVE
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#define RELOC(n) DT_REL ## n
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#define UNSUPPORTED_RELOC(n) DT_RELA ## n
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#define STR_RELOC(n) "DT_REL" # n
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#define Reloc Rel
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#else
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#error Unknown ELF machine type
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#endif
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/**
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* Android system headers don't have all definitions
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*/
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#ifndef STN_UNDEF
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#define STN_UNDEF 0
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#endif
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#ifndef DT_INIT_ARRAY
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#define DT_INIT_ARRAY 25
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#endif
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#ifndef DT_FINI_ARRAY
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#define DT_FINI_ARRAY 26
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#endif
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#ifndef DT_INIT_ARRAYSZ
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#define DT_INIT_ARRAYSZ 27
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#endif
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#ifndef DT_FINI_ARRAYSZ
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#define DT_FINI_ARRAYSZ 28
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#endif
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#ifndef DT_RELACOUNT
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#define DT_RELACOUNT 0x6ffffff9
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#endif
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#ifndef DT_RELCOUNT
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#define DT_RELCOUNT 0x6ffffffa
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#endif
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#ifndef DT_VERSYM
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#define DT_VERSYM 0x6ffffff0
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#endif
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#ifndef DT_VERDEF
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#define DT_VERDEF 0x6ffffffc
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#endif
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#ifndef DT_VERDEFNUM
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#define DT_VERDEFNUM 0x6ffffffd
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#endif
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#ifndef DT_VERNEED
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#define DT_VERNEED 0x6ffffffe
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#endif
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#ifndef DT_VERNEEDNUM
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#define DT_VERNEEDNUM 0x6fffffff
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#endif
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#ifndef DT_FLAGS
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#define DT_FLAGS 30
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#endif
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#ifndef DF_SYMBOLIC
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#define DF_SYMBOLIC 0x00000002
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#endif
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#ifndef DF_TEXTREL
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#define DF_TEXTREL 0x00000004
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#endif
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namespace Elf {
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/**
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* Define a few basic Elf Types
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*/
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typedef Elf_(Phdr) Phdr;
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typedef Elf_(Dyn) Dyn;
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typedef Elf_(Sym) Sym;
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typedef Elf_(Addr) Addr;
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typedef Elf_(Word) Word;
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/**
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* Helper class around the standard Elf header struct
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*/
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struct Ehdr: public Elf_(Ehdr)
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{
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/**
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* Equivalent to reinterpret_cast<const Ehdr *>(buf), but additionally
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* checking that this is indeed an Elf header and that the Elf type
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* corresponds to that of the system
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*/
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static const Ehdr *validate(const void *buf);
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};
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/**
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* Elf String table
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*/
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class Strtab: public UnsizedArray<const char>
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{
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public:
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/**
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* Returns the string at the given index in the table
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*/
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const char *GetStringAt(off_t index) const
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{
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return &UnsizedArray<const char>::operator[](index);
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}
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};
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/**
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* Helper class around Elf relocation.
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*/
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struct Rel: public Elf_(Rel)
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{
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/**
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* Returns the addend for the relocation, which is the value stored
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* at r_offset.
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*/
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Addr GetAddend(void *base) const
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{
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return *(reinterpret_cast<const Addr *>(
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reinterpret_cast<const char *>(base) + r_offset));
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}
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};
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/**
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* Helper class around Elf relocation with addend.
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*/
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struct Rela: public Elf_(Rela)
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{
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/**
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* Returns the addend for the relocation.
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*/
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Addr GetAddend(void *base) const
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{
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return r_addend;
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}
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};
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} /* namespace Elf */
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#include "Elfxx.h"
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class Mappable;
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@ -92,6 +92,26 @@ __wrap_dladdr(void *addr, Dl_info *info)
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return 1;
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}
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int
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__wrap_dl_iterate_phdr(dl_phdr_cb callback, void *data)
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{
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if (ElfLoader::Singleton.dbg == NULL)
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return -1;
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for (ElfLoader::r_debug::iterator it = ElfLoader::Singleton.dbg->begin();
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it < ElfLoader::Singleton.dbg->end(); ++it) {
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dl_phdr_info info;
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info.dlpi_addr = reinterpret_cast<Elf::Addr>(it->l_addr);
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info.dlpi_name = it->l_name;
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info.dlpi_phdr = NULL;
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info.dlpi_phnum = 0;
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int ret = callback(&info, sizeof(dl_phdr_info), data);
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if (ret)
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return ret;
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}
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return 0;
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}
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namespace {
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/**
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@ -10,6 +10,7 @@
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#include <signal.h>
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#include "mozilla/RefPtr.h"
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#include "Zip.h"
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#include "Elfxx.h"
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/**
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* dlfcn.h replacement functions
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@ -33,6 +34,16 @@ extern "C" {
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sighandler_t __wrap_signal(int signum, sighandler_t handler);
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int __wrap_sigaction(int signum, const struct sigaction *act,
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struct sigaction *oldact);
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struct dl_phdr_info {
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Elf::Addr dlpi_addr;
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const char *dlpi_name;
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const Elf::Phdr *dlpi_phdr;
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Elf::Half dlpi_phnum;
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};
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typedef int (*dl_phdr_cb)(struct dl_phdr_info *, size_t, void *);
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int __wrap_dl_iterate_phdr(dl_phdr_cb callback, void *data);
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}
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/**
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@ -356,6 +367,8 @@ private:
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/* Keep track of Zips used for library loading */
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ZipCollection zips;
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/* Forward declaration, see further below */
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class r_debug;
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public:
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/* Loaded object descriptor for the debugger interface below*/
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struct link_map {
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@ -365,6 +378,9 @@ public:
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const char *l_name;
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/* Address of the PT_DYNAMIC segment. */
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const void *l_ld;
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private:
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friend class ElfLoader::r_debug;
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/* Double linked list of loaded objects. */
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link_map *l_next, *l_prev;
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};
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@ -381,6 +397,45 @@ private:
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/* Make the debugger aware of the unloading of an object */
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void Remove(link_map *map);
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/* Iterates over all link_maps */
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class iterator
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{
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public:
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const link_map *operator ->() const
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{
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return item;
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}
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const link_map &operator ++()
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{
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item = item->l_next;
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return *item;
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}
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bool operator<(const iterator &other) const
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{
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if (other.item == NULL)
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return item ? true : false;
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MOZ_NOT_REACHED("r_debug::iterator::operator< called with something else than r_debug::end()");
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}
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protected:
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friend class r_debug;
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iterator(const link_map *item): item(item) { }
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private:
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const link_map *item;
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};
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iterator begin() const
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{
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return iterator(r_map);
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}
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iterator end() const
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{
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return iterator(NULL);
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}
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private:
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/* Version number of the protocol. */
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int r_version;
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@ -401,6 +456,7 @@ private:
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RT_DELETE /* Beginning to remove an object */
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} r_state;
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};
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friend int __wrap_dl_iterate_phdr(dl_phdr_cb callback, void *data);
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r_debug *dbg;
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/**
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|
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@ -0,0 +1,236 @@
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/* This Source Code Form is subject to the terms of the Mozilla Public
|
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef Elfxx_h
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#define Elfxx_h
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/**
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* Android system headers have two different elf.h file. The one under linux/
|
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* is the most complete.
|
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*/
|
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#ifdef ANDROID
|
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#include <linux/elf.h>
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#else
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#include <elf.h>
|
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#endif
|
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#include <endian.h>
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/**
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* Generic ELF macros for the target system
|
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*/
|
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#ifdef HAVE_64BIT_OS
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#define Elf_(type) Elf64_ ## type
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#define ELFCLASS ELFCLASS64
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#define ELF_R_TYPE ELF64_R_TYPE
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#define ELF_R_SYM ELF64_R_SYM
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#ifndef ELF_ST_BIND
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#define ELF_ST_BIND ELF64_ST_BIND
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#endif
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#define PRIxAddr "lx"
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#else
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#define Elf_(type) Elf32_ ## type
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#define ELFCLASS ELFCLASS32
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#define ELF_R_TYPE ELF32_R_TYPE
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#define ELF_R_SYM ELF32_R_SYM
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#ifndef ELF_ST_BIND
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#define ELF_ST_BIND ELF32_ST_BIND
|
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#endif
|
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#define PRIxAddr "x"
|
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#endif
|
||||
|
||||
#ifndef __BYTE_ORDER
|
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#error Cannot find endianness
|
||||
#endif
|
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|
||||
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
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#define ELFDATA ELFDATA2LSB
|
||||
#elif __BYTE_ORDER == __BIG_ENDIAN
|
||||
#define ELFDATA ELFDATA2MSB
|
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#endif
|
||||
|
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#ifdef __linux__
|
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#define ELFOSABI ELFOSABI_LINUX
|
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#ifdef EI_ABIVERSION
|
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#define ELFABIVERSION 0
|
||||
#endif
|
||||
#else
|
||||
#error Unknown ELF OSABI
|
||||
#endif
|
||||
|
||||
#if defined(__i386__)
|
||||
#define ELFMACHINE EM_386
|
||||
|
||||
// Doing this way probably doesn't scale to other architectures
|
||||
#define R_ABS R_386_32
|
||||
#define R_GLOB_DAT R_386_GLOB_DAT
|
||||
#define R_JMP_SLOT R_386_JMP_SLOT
|
||||
#define R_RELATIVE R_386_RELATIVE
|
||||
#define RELOC(n) DT_REL ## n
|
||||
#define UNSUPPORTED_RELOC(n) DT_RELA ## n
|
||||
#define STR_RELOC(n) "DT_REL" # n
|
||||
#define Reloc Rel
|
||||
|
||||
#elif defined(__x86_64__)
|
||||
#define ELFMACHINE EM_X86_64
|
||||
|
||||
#define R_ABS R_X86_64_64
|
||||
#define R_GLOB_DAT R_X86_64_GLOB_DAT
|
||||
#define R_JMP_SLOT R_X86_64_JUMP_SLOT
|
||||
#define R_RELATIVE R_X86_64_RELATIVE
|
||||
#define RELOC(n) DT_RELA ## n
|
||||
#define UNSUPPORTED_RELOC(n) DT_REL ## n
|
||||
#define STR_RELOC(n) "DT_RELA" # n
|
||||
#define Reloc Rela
|
||||
|
||||
#elif defined(__arm__)
|
||||
#define ELFMACHINE EM_ARM
|
||||
|
||||
#ifndef R_ARM_ABS32
|
||||
#define R_ARM_ABS32 2
|
||||
#endif
|
||||
#ifndef R_ARM_GLOB_DAT
|
||||
#define R_ARM_GLOB_DAT 21
|
||||
#endif
|
||||
#ifndef R_ARM_JUMP_SLOT
|
||||
#define R_ARM_JUMP_SLOT 22
|
||||
#endif
|
||||
#ifndef R_ARM_RELATIVE
|
||||
#define R_ARM_RELATIVE 23
|
||||
#endif
|
||||
|
||||
#define R_ABS R_ARM_ABS32
|
||||
#define R_GLOB_DAT R_ARM_GLOB_DAT
|
||||
#define R_JMP_SLOT R_ARM_JUMP_SLOT
|
||||
#define R_RELATIVE R_ARM_RELATIVE
|
||||
#define RELOC(n) DT_REL ## n
|
||||
#define UNSUPPORTED_RELOC(n) DT_RELA ## n
|
||||
#define STR_RELOC(n) "DT_REL" # n
|
||||
#define Reloc Rel
|
||||
|
||||
#else
|
||||
#error Unknown ELF machine type
|
||||
#endif
|
||||
|
||||
/**
|
||||
* Android system headers don't have all definitions
|
||||
*/
|
||||
#ifndef STN_UNDEF
|
||||
#define STN_UNDEF 0
|
||||
#endif
|
||||
#ifndef DT_INIT_ARRAY
|
||||
#define DT_INIT_ARRAY 25
|
||||
#endif
|
||||
#ifndef DT_FINI_ARRAY
|
||||
#define DT_FINI_ARRAY 26
|
||||
#endif
|
||||
#ifndef DT_INIT_ARRAYSZ
|
||||
#define DT_INIT_ARRAYSZ 27
|
||||
#endif
|
||||
#ifndef DT_FINI_ARRAYSZ
|
||||
#define DT_FINI_ARRAYSZ 28
|
||||
#endif
|
||||
#ifndef DT_RELACOUNT
|
||||
#define DT_RELACOUNT 0x6ffffff9
|
||||
#endif
|
||||
#ifndef DT_RELCOUNT
|
||||
#define DT_RELCOUNT 0x6ffffffa
|
||||
#endif
|
||||
#ifndef DT_VERSYM
|
||||
#define DT_VERSYM 0x6ffffff0
|
||||
#endif
|
||||
#ifndef DT_VERDEF
|
||||
#define DT_VERDEF 0x6ffffffc
|
||||
#endif
|
||||
#ifndef DT_VERDEFNUM
|
||||
#define DT_VERDEFNUM 0x6ffffffd
|
||||
#endif
|
||||
#ifndef DT_VERNEED
|
||||
#define DT_VERNEED 0x6ffffffe
|
||||
#endif
|
||||
#ifndef DT_VERNEEDNUM
|
||||
#define DT_VERNEEDNUM 0x6fffffff
|
||||
#endif
|
||||
#ifndef DT_FLAGS
|
||||
#define DT_FLAGS 30
|
||||
#endif
|
||||
#ifndef DF_SYMBOLIC
|
||||
#define DF_SYMBOLIC 0x00000002
|
||||
#endif
|
||||
#ifndef DF_TEXTREL
|
||||
#define DF_TEXTREL 0x00000004
|
||||
#endif
|
||||
|
||||
namespace Elf {
|
||||
|
||||
/**
|
||||
* Define a few basic Elf Types
|
||||
*/
|
||||
typedef Elf_(Phdr) Phdr;
|
||||
typedef Elf_(Dyn) Dyn;
|
||||
typedef Elf_(Sym) Sym;
|
||||
typedef Elf_(Addr) Addr;
|
||||
typedef Elf_(Word) Word;
|
||||
typedef Elf_(Half) Half;
|
||||
|
||||
/**
|
||||
* Helper class around the standard Elf header struct
|
||||
*/
|
||||
struct Ehdr: public Elf_(Ehdr)
|
||||
{
|
||||
/**
|
||||
* Equivalent to reinterpret_cast<const Ehdr *>(buf), but additionally
|
||||
* checking that this is indeed an Elf header and that the Elf type
|
||||
* corresponds to that of the system
|
||||
*/
|
||||
static const Ehdr *validate(const void *buf);
|
||||
};
|
||||
|
||||
/**
|
||||
* Elf String table
|
||||
*/
|
||||
class Strtab: public UnsizedArray<const char>
|
||||
{
|
||||
public:
|
||||
/**
|
||||
* Returns the string at the given index in the table
|
||||
*/
|
||||
const char *GetStringAt(off_t index) const
|
||||
{
|
||||
return &UnsizedArray<const char>::operator[](index);
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Helper class around Elf relocation.
|
||||
*/
|
||||
struct Rel: public Elf_(Rel)
|
||||
{
|
||||
/**
|
||||
* Returns the addend for the relocation, which is the value stored
|
||||
* at r_offset.
|
||||
*/
|
||||
Addr GetAddend(void *base) const
|
||||
{
|
||||
return *(reinterpret_cast<const Addr *>(
|
||||
reinterpret_cast<const char *>(base) + r_offset));
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Helper class around Elf relocation with addend.
|
||||
*/
|
||||
struct Rela: public Elf_(Rela)
|
||||
{
|
||||
/**
|
||||
* Returns the addend for the relocation.
|
||||
*/
|
||||
Addr GetAddend(void *base) const
|
||||
{
|
||||
return r_addend;
|
||||
}
|
||||
};
|
||||
|
||||
} /* namespace Elf */
|
||||
|
||||
#endif /* Elfxx_h */
|
||||
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