source:
EcnlProtoTool/trunk/musl-1.1.18/src/internal/fdpic_crt.h
Last change on this file was 444, checked in by , 4 years ago | |
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File size: 871 bytes |
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1 | #include <stdint.h> |
2 | |
3 | __attribute__((__visibility__("hidden"))) |
4 | void *__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 | } |
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