29 lines
858 B
C
29 lines
858 B
C
#include <stdint.h>
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#include <features.h>
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hidden void *__fdpic_fixup(void *map, uintptr_t *a, uintptr_t *z)
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{
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/* If map is a null pointer, the program was loaded by a
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* non-FDPIC-aware ELF loader, and fixups are not needed,
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* but the value for the GOT pointer is. */
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if (!map) return (void *)z[-1];
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struct {
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unsigned short version, nsegs;
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struct fdpic_loadseg {
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uintptr_t addr, p_vaddr, p_memsz;
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} segs[];
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} *lm = map;
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int nsegs = lm->nsegs, rseg = 0, vseg = 0;
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for (;;) {
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while (*a-lm->segs[rseg].p_vaddr >= lm->segs[rseg].p_memsz)
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if (++rseg == nsegs) rseg = 0;
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uintptr_t *r = (uintptr_t *)
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(*a + lm->segs[rseg].addr - lm->segs[rseg].p_vaddr);
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if (++a == z) return r;
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while (*r-lm->segs[vseg].p_vaddr >= lm->segs[vseg].p_memsz)
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if (++vseg == nsegs) vseg = 0;
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*r += lm->segs[vseg].addr - lm->segs[vseg].p_vaddr;
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}
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}
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