1#include <stdint.h> 2 3__attribute__((__visibility__("hidden"))) 4void *__fdpic_fixup(void *map, uintptr_t *a, uintptr_t *z) 5{ 6 /* If map is a null pointer, the program was loaded by a 7 * non-FDPIC-aware ELF loader, and fixups are not needed, 8 * but the value for the GOT pointer is. */ 9 if (!map) return (void *)z[-1]; 10 11 struct { 12 unsigned short version, nsegs; 13 struct fdpic_loadseg { 14 uintptr_t addr, p_vaddr, p_memsz; 15 } segs[]; 16 } *lm = map; 17 int nsegs = lm->nsegs, rseg = 0, vseg = 0; 18 for (;;) { 19 while (*a-lm->segs[rseg].p_vaddr >= lm->segs[rseg].p_memsz) 20 if (++rseg == nsegs) rseg = 0; 21 uintptr_t *r = (uintptr_t *) 22 (*a + lm->segs[rseg].addr - lm->segs[rseg].p_vaddr); 23 if (++a == z) return r; 24 while (*r-lm->segs[vseg].p_vaddr >= lm->segs[vseg].p_memsz) 25 if (++vseg == nsegs) vseg = 0; 26 *r += lm->segs[vseg].addr - lm->segs[vseg].p_vaddr; 27 } 28} 29