7 #define START "_dlstart"
13 #define GETFUNCSYM(fp, sym, got) do { \
14 __attribute__((__visibility__("hidden"))) void sym(); \
15 static void (*static_func_ptr)() = sym; \
16 __asm__ __volatile__ ( "" : "+m"(static_func_ptr) : : "memory"); \
17 *(fp) = static_func_ptr; } while(0)
20 __attribute__((__visibility__("hidden")))
21 void _dlstart_c(size_t *sp, size_t *dynv)
23 size_t i, aux[AUX_CNT], dyn[DYN_CNT];
26 char **argv = (void *)(sp+1);
28 for (i=argc+1; argv[i]; i++);
29 size_t *auxv = (void *)(argv+i+1);
31 for (i=0; i<AUX_CNT; i++) aux[i] = 0;
32 for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT)
33 aux[auxv[i]] = auxv[i+1];
35 for (i=0; i<DYN_CNT; i++) dyn[i] = 0;
36 for (i=0; dynv[i]; i+=2) if (dynv[i]<DYN_CNT)
37 dyn[dynv[i]] = dynv[i+1];
39 /* If the dynamic linker is invoked as a command, its load
40 * address is not available in the aux vector. Instead, compute
41 * the load address as the difference between &_DYNAMIC and the
42 * virtual address in the PT_DYNAMIC program header. */
43 unsigned char *base = (void *)aux[AT_BASE];
45 size_t phnum = aux[AT_PHNUM];
46 size_t phentsize = aux[AT_PHENT];
47 Phdr *ph = (void *)aux[AT_PHDR];
48 for (i=phnum; i--; ph = (void *)((char *)ph + phentsize)) {
49 if (ph->p_type == PT_DYNAMIC) {
50 base = (void *)((size_t)dynv - ph->p_vaddr);
56 /* MIPS uses an ugly packed form for GOT relocations. Since we
57 * can't make function calls yet and the code is tiny anyway,
58 * it's simply inlined here. */
59 if (NEED_MIPS_GOT_RELOCS) {
61 size_t *got = (void *)(base + dyn[DT_PLTGOT]);
62 for (i=0; dynv[i]; i+=2) if (dynv[i]==DT_MIPS_LOCAL_GOTNO)
63 local_cnt = dynv[i+1];
64 for (i=0; i<local_cnt; i++) got[i] += (size_t)base;
67 size_t *rel, rel_size;
69 rel = (void *)(base+dyn[DT_REL]);
70 rel_size = dyn[DT_RELSZ];
71 for (; rel_size; rel+=2, rel_size-=2*sizeof(size_t)) {
72 if (!IS_RELATIVE(rel[1])) continue;
73 size_t *rel_addr = (void *)(base + rel[0]);
74 *rel_addr += (size_t)base;
77 rel = (void *)(base+dyn[DT_RELA]);
78 rel_size = dyn[DT_RELASZ];
79 for (; rel_size; rel+=3, rel_size-=3*sizeof(size_t)) {
80 if (!IS_RELATIVE(rel[1])) continue;
81 size_t *rel_addr = (void *)(base + rel[0]);
82 *rel_addr = (size_t)base + rel[2];
86 GETFUNCSYM(&dls2, __dls2, base+dyn[DT_PLTGOT]);