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