Annotation of src/libexec/ld.elf_so/arch/sh3/mdreloc.c, Revision 1.16
1.16 ! marcus 1: /* $NetBSD: mdreloc.c,v 1.15 2003/06/30 00:50:46 marcus Exp $ */
1.10 junyoung 2:
1.1 mycroft 3: #include <sys/types.h>
4: #include <sys/stat.h>
5:
6: #include "debug.h"
7: #include "rtld.h"
1.11 mycroft 8:
9: void _rtld_bind_start(void);
1.1 mycroft 10:
11: void
12: _rtld_setup_pltgot(const Obj_Entry *obj)
13: {
14: obj->pltgot[1] = (Elf_Addr) obj;
15: obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
16: }
1.2 mycroft 17:
1.15 marcus 18: void
19: _rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
20: {
21: const Elf_Rela *rela = 0, *relalim;
22: Elf_Addr relasz = 0;
23: Elf_Addr *where;
24:
25: for (; dynp->d_tag != DT_NULL; dynp++) {
26: switch (dynp->d_tag) {
27: case DT_RELA:
28: rela = (const Elf_Rela *)(relocbase + dynp->d_un.d_ptr);
29: break;
30: case DT_RELASZ:
31: relasz = dynp->d_un.d_val;
32: break;
33: }
34: }
35: relalim = (const Elf_Rela *)((caddr_t)rela + relasz);
36: for (; rela < relalim; rela++) {
37: where = (Elf_Addr *)(relocbase + rela->r_offset);
38: *where = (Elf_Addr)(relocbase + rela->r_addend);
39: }
40: }
41:
1.2 mycroft 42: int
1.13 mycroft 43: _rtld_relocate_nonplt_objects(obj)
1.7 mycroft 44: const Obj_Entry *obj;
1.2 mycroft 45: {
1.3 mycroft 46: const Elf_Rela *rela;
1.2 mycroft 47:
1.3 mycroft 48: for (rela = obj->rela; rela < obj->relalim; rela++) {
49: Elf_Addr *where;
50: const Elf_Sym *def;
51: const Obj_Entry *defobj;
52: Elf_Addr tmp;
1.4 mycroft 53: unsigned long symnum;
1.3 mycroft 54:
55: where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
1.4 mycroft 56: symnum = ELF_R_SYM(rela->r_info);
1.3 mycroft 57:
58: switch (ELF_R_TYPE(rela->r_info)) {
59: case R_TYPE(NONE):
60: break;
1.2 mycroft 61:
62: #if 1 /* XXX should not occur */
1.3 mycroft 63: case R_TYPE(GOT32):
1.4 mycroft 64: def = _rtld_find_symdef(symnum, obj, &defobj, false);
1.3 mycroft 65: if (def == NULL)
66: return -1;
67:
68: tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
69: rela->r_addend);
70: if (*where != tmp)
71: *where = tmp;
1.12 mycroft 72: rdbg(("GOT32 %s in %s --> %p in %s",
1.5 mycroft 73: obj->strtab + obj->symtab[symnum].st_name,
74: obj->path, (void *)*where, defobj->path));
1.3 mycroft 75: break;
76:
77: case R_TYPE(REL32):
1.4 mycroft 78: def = _rtld_find_symdef(symnum, obj, &defobj, false);
1.3 mycroft 79: if (def == NULL)
80: return -1;
81:
1.16 ! marcus 82: tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
1.3 mycroft 83: rela->r_addend) - (Elf_Addr)where;
1.16 ! marcus 84: if (*where != tmp)
! 85: *where = tmp;
1.12 mycroft 86: rdbg(("PC32 %s in %s --> %p in %s",
1.5 mycroft 87: obj->strtab + obj->symtab[symnum].st_name,
88: obj->path, (void *)*where, defobj->path));
1.3 mycroft 89: break;
1.2 mycroft 90: #endif
91:
1.3 mycroft 92: case R_TYPE(DIR32):
1.4 mycroft 93: def = _rtld_find_symdef(symnum, obj, &defobj, false);
1.3 mycroft 94: if (def == NULL)
95: return -1;
96:
1.16 ! marcus 97: tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
1.3 mycroft 98: rela->r_addend);
1.16 ! marcus 99: if (*where != tmp)
! 100: *where = tmp;
1.12 mycroft 101: rdbg(("32 %s in %s --> %p in %s",
1.5 mycroft 102: obj->strtab + obj->symtab[symnum].st_name,
103: obj->path, (void *)*where, defobj->path));
1.3 mycroft 104: break;
105:
106: case R_TYPE(GLOB_DAT):
1.4 mycroft 107: def = _rtld_find_symdef(symnum, obj, &defobj, false);
1.3 mycroft 108: if (def == NULL)
109: return -1;
110:
111: tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
112: rela->r_addend;
113: if (*where != tmp)
114: *where = tmp;
1.12 mycroft 115: rdbg(("GLOB_DAT %s in %s --> %p in %s",
1.5 mycroft 116: obj->strtab + obj->symtab[symnum].st_name,
117: obj->path, (void *)*where, defobj->path));
1.3 mycroft 118: break;
119:
120: case R_TYPE(RELATIVE):
121: if (rela->r_addend)
122: *where = (Elf_Addr)obj->relocbase + rela->r_addend;
123: else
124: *where += (Elf_Addr)obj->relocbase;
1.12 mycroft 125: rdbg(("RELATIVE in %s --> %p", obj->path,
1.3 mycroft 126: (void *)*where));
127: break;
128:
129: case R_TYPE(COPY):
130: /*
131: * These are deferred until all other relocations have
132: * been done. All we do here is make sure that the
133: * COPY relocation is not in a shared library. They
134: * are allowed only in executable files.
135: */
1.8 mycroft 136: if (obj->isdynamic) {
1.3 mycroft 137: _rtld_error(
1.2 mycroft 138: "%s: Unexpected R_COPY relocation in shared library",
1.3 mycroft 139: obj->path);
140: return -1;
141: }
1.12 mycroft 142: rdbg(("COPY (avoid in main)"));
1.3 mycroft 143: break;
144:
145: default:
1.12 mycroft 146: rdbg(("sym = %lu, type = %lu, offset = %p, "
1.3 mycroft 147: "addend = %p, contents = %p, symbol = %s",
1.4 mycroft 148: symnum, (u_long)ELF_R_TYPE(rela->r_info),
1.3 mycroft 149: (void *)rela->r_offset, (void *)rela->r_addend,
150: (void *)*where,
1.4 mycroft 151: obj->strtab + obj->symtab[symnum].st_name));
1.3 mycroft 152: _rtld_error("%s: Unsupported relocation type %ld "
153: "in non-PLT relocations\n",
154: obj->path, (u_long) ELF_R_TYPE(rela->r_info));
1.2 mycroft 155: return -1;
156: }
157: }
158: return 0;
159: }
1.6 mycroft 160:
161: int
1.12 mycroft 162: _rtld_relocate_plt_lazy(obj)
1.7 mycroft 163: const Obj_Entry *obj;
1.6 mycroft 164: {
165: const Elf_Rela *rela;
166:
1.14 mycroft 167: if (!obj->relocbase)
1.6 mycroft 168: return 0;
169:
170: for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
171: Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
172:
173: assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
174:
175: /* Just relocate the GOT slots pointing into the PLT */
176: *where += (Elf_Addr)obj->relocbase;
1.12 mycroft 177: rdbg(("fixup !main in %s --> %p", obj->path, (void *)*where));
1.6 mycroft 178: }
179:
180: return 0;
1.15 marcus 181: }
182:
183: caddr_t
184: _rtld_bind(obj, reloff)
185: const Obj_Entry *obj;
186: Elf_Word reloff;
187: {
188: const Elf_Rela *rela = (const Elf_Rela *)((caddr_t)obj->pltrela + reloff);
189: Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
190: Elf_Addr new_value;
191: const Elf_Sym *def;
192: const Obj_Entry *defobj;
193:
194: assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
195:
196: def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
197: if (def == NULL)
198: _rtld_die();
199:
200: new_value = (Elf_Addr)(defobj->relocbase + def->st_value);
201: rdbg(("bind now/fixup in %s --> old=%p new=%p",
202: defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
203: if (*where != new_value)
204: *where = new_value;
205:
206: return (caddr_t)new_value;
1.6 mycroft 207: }
208:
209: int
1.12 mycroft 210: _rtld_relocate_plt_object(obj, rela, addrp)
1.7 mycroft 211: const Obj_Entry *obj;
1.6 mycroft 212: const Elf_Rela *rela;
213: caddr_t *addrp;
214: {
215: Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
216: Elf_Addr new_value;
217: const Elf_Sym *def;
218: const Obj_Entry *defobj;
219:
220: assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
221:
222: def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
223: if (def == NULL)
224: return -1;
225:
226: new_value = (Elf_Addr)(defobj->relocbase + def->st_value +
227: rela->r_addend);
1.12 mycroft 228: rdbg(("bind now/fixup in %s --> old=%p new=%p",
1.6 mycroft 229: defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
230: if (*where != new_value)
231: *where = new_value;
232:
233: *addrp = (caddr_t)new_value;
234: return 0;
235: }
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