diff options
Diffstat (limited to 'kc/dynamic_x86_64.c')
| -rw-r--r-- | kc/dynamic_x86_64.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/kc/dynamic_x86_64.c b/kc/dynamic_x86_64.c new file mode 100644 index 0000000..22300d6 --- /dev/null +++ b/kc/dynamic_x86_64.c @@ -0,0 +1,53 @@ +#include <kc.h> + +void kc_dynamic_init(void *base, Elf64_Dyn *dyn) +{ + struct rela + { + Elf64_Rela *entries; + size_t size; + size_t entsize; + }; + + struct rela reladyn = {NULL,}; + struct rela relaplt = {NULL,}; + + Elf64_Addr *gotplt; + + while (dyn && dyn->d_tag != DT_NULL) + { + switch(dyn->d_tag) + { + // check for basic relocations first + case DT_RELA: + reladyn.entries = (Elf64_Rela *)(dyn->d_ptr + (uintptr_t)base); + break; + case DT_RELASZ: + reladyn.size = dyn->d_val; + break; + // might be combined with JMPRELs so check those too + case DT_JMPREL: + relaplt.entries = (Elf64_Rela *)(dyn->d_ptr + (uintptr_t)base); + break; + case DT_PLTRELSZ: + relaplt.size = dyn->d_val; + break; + case DT_RELAENT: + reladyn.entsize = dyn->d_val; + relaplt.entsize = dyn->d_val; + break; + case DT_PLTGOT: + gotplt = (uintptr_t *)(dyn->d_ptr + (uintptr_t)base); + break; + } + dyn++; + } + + // peform relocations + // + gotplt[1] = (uintptr_t)NULL; + gotplt[2] = (uintptr_t)kc_resolve_symbol; + kc_reloc(base, relaplt.entries, relaplt.size, relaplt.entsize); + kc_reloc(base, reladyn.entries, reladyn.size, reladyn.entsize); +} + |