7 #define START "_dlstart"
12 __attribute__((__visibility__("hidden")))
13 void _dlstart_c(size_t *sp, size_t *dynv)
15 size_t i, aux[AUX_CNT], dyn[DYN_CNT];
18 char **argv = (void *)(sp+1);
20 for (i=argc+1; argv[i]; i++);
21 size_t *auxv = (void *)(argv+i+1);
23 for (i=0; i<AUX_CNT; i++) aux[i] = 0;
24 for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT)
25 aux[auxv[i]] = auxv[i+1];
27 for (i=0; i<DYN_CNT; i++) dyn[i] = 0;
28 for (i=0; dynv[i]; i+=2) if (dynv[i]<DYN_CNT)
29 dyn[dynv[i]] = dynv[i+1];
31 /* If the dynamic linker is invoked as a command, its load
32 * address is not available in the aux vector. Instead, compute
33 * the load address as the difference between &_DYNAMIC and the
34 * virtual address in the PT_DYNAMIC program header. */
35 unsigned char *base = (void *)aux[AT_BASE];
37 size_t phnum = aux[AT_PHNUM];
38 size_t phentsize = aux[AT_PHENT];
39 Phdr *ph = (void *)aux[AT_PHDR];
40 for (i=phnum; i--; ph = (void *)((char *)ph + phentsize)) {
41 if (ph->p_type == PT_DYNAMIC) {
42 base = (void *)((size_t)dynv - ph->p_vaddr);
48 /* MIPS uses an ugly packed form for GOT relocations. Since we
49 * can't make function calls yet and the code is tiny anyway,
50 * it's simply inlined here. */
51 if (NEED_MIPS_GOT_RELOCS) {
53 size_t *got = (void *)(base + dyn[DT_PLTGOT]);
54 for (i=0; dynv[i]; i+=2) if (dynv[i]==DT_MIPS_LOCAL_GOTNO)
55 local_cnt = dynv[i+1];
56 for (i=0; i<local_cnt; i++) got[i] += (size_t)base;
59 /* The use of the reloc_info structure and nested loops is a trick
60 * to work around the fact that we can't necessarily make function
61 * calls yet. Each struct in the array serves like the arguments
62 * to a function call. */
68 { base+dyn[DT_JMPREL], dyn[DT_PLTRELSZ], 2+(dyn[DT_PLTREL]==DT_RELA) },
69 { base+dyn[DT_REL], dyn[DT_RELSZ], 2 },
70 { base+dyn[DT_RELA], dyn[DT_RELASZ], 3 },
74 for (i=0; reloc_info[i].stride; i++) {
75 size_t *rel = reloc_info[i].rel;
76 size_t rel_size = reloc_info[i].size;
77 size_t stride = reloc_info[i].stride;
78 for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
79 if (!IS_RELATIVE(rel[1])) continue;
80 size_t *rel_addr = (void *)(base + rel[0]);
81 size_t addend = stride==3 ? rel[2] : *rel_addr;
82 *rel_addr = (size_t)base + addend;
86 const char *strings = (void *)(base + dyn[DT_STRTAB]);
87 const Sym *syms = (void *)(base + dyn[DT_SYMTAB]);
89 /* Call dynamic linker stage-2, __dls2 */
91 const char *s = strings + syms[i].st_name;
92 if (s[0]=='_' && s[1]=='_' && s[2]=='d'
93 && s[3]=='l' && s[4]=='s' && s[5]=='2' && !s[6])
96 ((stage2_func)(base + syms[i].st_value))(base);
98 /* Call dynamic linker stage-3, __dls3 */
100 const char *s = strings + syms[i].st_name;
101 if (s[0]=='_' && s[1]=='_' && s[2]=='d'
102 && s[3]=='l' && s[4]=='s' && s[5]=='3' && !s[6])
105 ((stage3_func)(base + syms[i].st_value))(sp);