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experimental dynamic linker!

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some notes:
- library search path is hard coded
- x86_64 code is untested and may not work
- dlopen/dlsym is not yet implemented
- relocations in read-only memory won't work
This commit is contained in:
Rich Felker 2011-06-18 19:48:42 -04:00
commit 51e2d83102
5 changed files with 466 additions and 0 deletions
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26
arch/i386/reloc.h Normal file
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#include <string.h>
#include <elf.h>
#define IS_COPY(x) ((x)==R_386_COPY)
static inline void do_single_reloc(size_t *reloc_addr, int type, size_t sym_val, size_t sym_size, unsigned char *base_addr, size_t addend)
{
switch(type) {
case R_386_32:
*reloc_addr += sym_val;
break;
case R_386_PC32:
*reloc_addr += sym_val - (size_t)reloc_addr;
break;
case R_386_GLOB_DAT:
case R_386_JMP_SLOT:
*reloc_addr = sym_val;
break;
case R_386_RELATIVE:
*reloc_addr += (size_t)base_addr;
break;
case R_386_COPY:
memcpy(reloc_addr, (void *)sym_val, sym_size);
break;
}
}

28
arch/x86_64/reloc.h Normal file
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#include <stdint.h>
#include <string.h>
#include <elf.h>
#define IS_COPY(x) ((x)==R_X86_64_COPY)
static inline void do_single_reloc(size_t *reloc_addr, int type, size_t sym_val, size_t sym_size, unsigned char *base_addr, size_t addend)
{
switch(type) {
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
case R_X86_64_64:
*reloc_addr = sym_val + addend;
break;
case R_X86_64_32:
*(uint32_t *)reloc_addr = sym_val + addend;
break;
case R_X86_64_PC32:
*reloc_addr = sym_val + addend - (size_t)reloc_addr + (size_t)base_addr;
break;
case R_X86_64_RELATIVE:
*reloc_addr = (size_t)base_addr + addend;
break;
case R_X86_64_COPY:
memcpy(reloc_addr, (void *)sym_val, sym_size);
break;
}
}