1#include <stdint.h> 2 3__attribute__((__visibility__("hidden"))) void* __fdpic_fixup(void* map, uintptr_t* a, 4 uintptr_t* z) { 5 /* If map is a null pointer, the program was loaded by a 6 * non-FDPIC-aware ELF loader, and fixups are not needed, 7 * but the value for the GOT pointer is. */ 8 if (!map) 9 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) 21 rseg = 0; 22 uintptr_t* r = (uintptr_t*)(*a + lm->segs[rseg].addr - lm->segs[rseg].p_vaddr); 23 if (++a == z) 24 return r; 25 while (*r - lm->segs[vseg].p_vaddr >= lm->segs[vseg].p_memsz) 26 if (++vseg == nsegs) 27 vseg = 0; 28 *r += lm->segs[vseg].addr - lm->segs[vseg].p_vaddr; 29 } 30} 31