| #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; |
| } |
| } |
