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