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LibELF: Add support for loading objects with multiple data and text segments

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This enables loading executables with multiple data and text segments. Also
it fixes loading executables where the text segment has a non-zero offset.

Example:

  $ echo "main () {}" > test.c
  $ gcc -Wl,-z,separate-code -o test test.c
  $ objdump -p test
  test:     file format elf32-i386

  Program Header:
      PHDR off    0x00000034 vaddr 0x00000034 paddr 0x00000034 align 2**2
           filesz 0x000000e0 memsz 0x000000e0 flags r--
    INTERP off    0x00000114 vaddr 0x00000114 paddr 0x00000114 align 2**0
           filesz 0x00000013 memsz 0x00000013 flags r--
      LOAD off    0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**12
           filesz 0x000003c4 memsz 0x000003c4 flags r--
      LOAD off    0x00001000 vaddr 0x00001000 paddr 0x00001000 align 2**12
           filesz 0x00000279 memsz 0x00000279 flags r-x
      LOAD off    0x00002000 vaddr 0x00002000 paddr 0x00002000 align 2**12
           filesz 0x00000004 memsz 0x00000004 flags r--
      LOAD off    0x00002004 vaddr 0x00003004 paddr 0x00003004 align 2**12
           filesz 0x00000100 memsz 0x00000124 flags rw-
   DYNAMIC off    0x00002014 vaddr 0x00003014 paddr 0x00003014 align 2**2
           filesz 0x000000c8 memsz 0x000000c8 flags rw-
This commit is contained in:
Gunnar Beutner 2021-04-13 19:31:34 +02:00 • committed by Andreas Kling
parent c3ee70591a
commit cd7512a2ad
4 changed files with 121 additions and 77 deletions
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4
Userland/Libraries/LibELF/DynamicObject.cpp
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@ -38,9 +38,9 @@ namespace ELF {
static const char* name_for_dtag(Elf32_Sword d_tag);
DynamicObject::DynamicObject(VirtualAddress base_address, VirtualAddress dynamic_section_addresss)
DynamicObject::DynamicObject(VirtualAddress base_address, VirtualAddress dynamic_section_address)
: m_base_address(base_address)
, m_dynamic_address(dynamic_section_addresss)
, m_dynamic_address(dynamic_section_address)
{
auto* header = (Elf32_Ehdr*)base_address.as_ptr();
auto* pheader = (Elf32_Phdr*)(base_address.as_ptr() + header->e_phoff);