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1 #include <stdint.h> | 1 #include <stdint.h> |
2 | 2 |
3 __attribute__((__visibility__("hidden"))) | 3 __attribute__((__visibility__("hidden"))) void* __fdpic_fixup(void* map, |
4 void *__fdpic_fixup(void *map, uintptr_t *a, uintptr_t *z) | 4 uintptr_t* a, |
5 { | 5 uintptr_t* z) { |
6 » /* If map is a null pointer, the program was loaded by a | 6 /* If map is a null pointer, the program was loaded by a |
7 » * non-FDPIC-aware ELF loader, and fixups are not needed, | 7 * non-FDPIC-aware ELF loader, and fixups are not needed, |
8 » * but the value for the GOT pointer is. */ | 8 * but the value for the GOT pointer is. */ |
9 » if (!map) return (void *)z[-1]; | 9 if (!map) |
| 10 return (void*)z[-1]; |
10 | 11 |
11 » struct { | 12 struct { |
12 » » unsigned short version, nsegs; | 13 unsigned short version, nsegs; |
13 » » struct fdpic_loadseg { | 14 struct fdpic_loadseg { |
14 » » » uintptr_t addr, p_vaddr, p_memsz; | 15 uintptr_t addr, p_vaddr, p_memsz; |
15 » » } segs[]; | 16 } segs[]; |
16 » } *lm = map; | 17 }* lm = map; |
17 » int nsegs = lm->nsegs, rseg = 0, vseg = 0; | 18 int nsegs = lm->nsegs, rseg = 0, vseg = 0; |
18 » for (;;) { | 19 for (;;) { |
19 » » while (*a-lm->segs[rseg].p_vaddr >= lm->segs[rseg].p_memsz) | 20 while (*a - lm->segs[rseg].p_vaddr >= lm->segs[rseg].p_memsz) |
20 » » » if (++rseg == nsegs) rseg = 0; | 21 if (++rseg == nsegs) |
21 » » uintptr_t *r = (uintptr_t *) | 22 rseg = 0; |
22 » » » (*a + lm->segs[rseg].addr - lm->segs[rseg].p_vaddr); | 23 uintptr_t* r = |
23 » » if (++a == z) return r; | 24 (uintptr_t*)(*a + lm->segs[rseg].addr - lm->segs[rseg].p_vaddr); |
24 » » while (*r-lm->segs[vseg].p_vaddr >= lm->segs[vseg].p_memsz) | 25 if (++a == z) |
25 » » » if (++vseg == nsegs) vseg = 0; | 26 return r; |
26 » » *r += lm->segs[vseg].addr - lm->segs[vseg].p_vaddr; | 27 while (*r - lm->segs[vseg].p_vaddr >= lm->segs[vseg].p_memsz) |
27 » } | 28 if (++vseg == nsegs) |
| 29 vseg = 0; |
| 30 *r += lm->segs[vseg].addr - lm->segs[vseg].p_vaddr; |
| 31 } |
28 } | 32 } |
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