diff options
| -rw-r--r-- | src/internal/fdpic_crt.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/internal/fdpic_crt.h b/src/internal/fdpic_crt.h new file mode 100644 index 00000000..7eb50c6b --- /dev/null +++ b/src/internal/fdpic_crt.h @@ -0,0 +1,28 @@ +#include <stdint.h> + +__attribute__((__visibility__("hidden"))) +void *__fdpic_fixup(void *map, uintptr_t *a, uintptr_t *z) +{ + /* If map is a null pointer, the program was loaded by a + * non-FDPIC-aware ELF loader, and fixups are not needed, + * but the value for the GOT pointer is. */ + if (!map) return (void *)z[-1]; + + struct { + unsigned short version, nsegs; + struct fdpic_loadseg { + uintptr_t addr, p_vaddr, p_memsz; + } segs[]; + } *lm = map; + int nsegs = lm->nsegs, rseg = 0, vseg = 0; + for (;;) { + while (*a-lm->segs[rseg].p_vaddr >= lm->segs[rseg].p_memsz) + if (++rseg == nsegs) rseg = 0; + uintptr_t *r = (uintptr_t *) + (*a + lm->segs[rseg].addr - lm->segs[rseg].p_vaddr); + if (++a == z) return r; + while (*r-lm->segs[vseg].p_vaddr >= lm->segs[vseg].p_memsz) + if (++vseg == nsegs) vseg = 0; + *r += lm->segs[vseg].addr - lm->segs[vseg].p_vaddr; + } +} |