1 /* vi: set sw=4 ts=4: */
2 /* mips/mipsel ELF shared library loader suppport
4 Copyright (C) 2002, Steven J. Hill (sjhill@realitydiluted.com)
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. The name of the above contributors may not be
14 * used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 extern int _dl_runtime_resolve(void);
33 extern int _dl_runtime_pltresolve(void);
35 #define OFFSET_GP_GOT 0x7ff0
37 unsigned long __dl_runtime_resolve(unsigned long sym_index,
38 unsigned long old_gpreg)
40 unsigned long *got = (unsigned long *) (old_gpreg - OFFSET_GP_GOT);
41 struct elf_resolve *tpnt = (struct elf_resolve *) got[1];
44 unsigned long local_gotno;
46 unsigned long new_addr;
47 unsigned long instr_addr;
51 gotsym = tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
52 local_gotno = tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX];
54 sym = ((ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB]) + sym_index;
55 strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
56 symname = strtab + sym->st_name;
58 new_addr = (unsigned long) _dl_find_hash(symname,
59 &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
60 if (unlikely(!new_addr)) {
61 _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
62 _dl_progname, symname);
66 /* Address of jump instruction to fix up */
67 instr_addr = (unsigned long) (got + local_gotno + sym_index - gotsym);
68 got_addr = (char **) instr_addr;
70 #if defined (__SUPPORT_LD_DEBUG__)
71 if (_dl_debug_bindings)
73 _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
74 if (_dl_debug_detail) _dl_dprintf(_dl_debug_file,
75 "\n\tpatched %x ==> %x @ %x\n", *got_addr, new_addr, got_addr);
77 if (!_dl_debug_nofixups) {
78 *got_addr = (char*)new_addr;
81 *got_addr = (char*)new_addr;
88 __dl_runtime_pltresolve(struct elf_resolve *tpnt, int reloc_entry)
90 ELF_RELOC *this_reloc;
97 unsigned long instr_addr;
100 rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
101 this_reloc = (ELF_RELOC *)(intptr_t)(rel_addr + reloc_entry);
102 symtab_index = ELF_R_SYM(this_reloc->r_info);
104 symtab = (ElfW(Sym) *)(intptr_t)tpnt->dynamic_info[DT_SYMTAB];
105 strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
106 symname = strtab + symtab[symtab_index].st_name;
108 /* Address of the jump instruction to fix up. */
109 instr_addr = ((unsigned long)this_reloc->r_offset +
110 (unsigned long)tpnt->loadaddr);
111 got_addr = (char **)instr_addr;
113 /* Get the address of the GOT entry. */
114 new_addr = _dl_find_hash(symname, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
115 if (unlikely(!new_addr)) {
116 _dl_dprintf(2, "%s: can't resolve symbol '%s' in lib '%s'.\n", _dl_progname, symname, tpnt->libname);
120 #if defined (__SUPPORT_LD_DEBUG__)
121 if ((unsigned long)got_addr < 0x40000000) {
122 if (_dl_debug_bindings) {
123 _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
124 if (_dl_debug_detail)
125 _dl_dprintf(_dl_debug_file,
126 "\n\tpatched: %x ==> %x @ %x",
127 *got_addr, new_addr, got_addr);
130 if (!_dl_debug_nofixups) {
131 *got_addr = new_addr;
134 *got_addr = new_addr;
137 return (unsigned long)new_addr;
140 void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
141 unsigned long rel_addr, unsigned long rel_size)
147 int _dl_parse_relocation_information(struct dyn_elf *xpnt,
148 struct r_scope_elem *scope, unsigned long rel_addr, unsigned long rel_size)
155 unsigned long *reloc_addr=NULL;
156 unsigned long symbol_addr;
157 int reloc_type, symtab_index;
158 struct elf_resolve *tpnt = xpnt->dyn;
159 char *symname = NULL;
160 #if defined (__SUPPORT_LD_DEBUG__)
161 unsigned long old_val=0;
164 struct symbol_ref sym_ref;
165 /* Now parse the relocation information */
166 rel_size = rel_size / sizeof(ElfW(Rel));
167 rpnt = (ELF_RELOC *) rel_addr;
169 symtab = (ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB];
170 strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
171 got = (unsigned long *) tpnt->dynamic_info[DT_PLTGOT];
174 for (i = 0; i < rel_size; i++, rpnt++) {
175 reloc_addr = (unsigned long *) (tpnt->loadaddr +
176 (unsigned long) rpnt->r_offset);
177 reloc_type = ELF_R_TYPE(rpnt->r_info);
178 symtab_index = ELF_R_SYM(rpnt->r_info);
181 debug_sym(symtab,strtab,symtab_index);
182 debug_reloc(symtab,strtab,rpnt);
183 symname = strtab + symtab[symtab_index].st_name;
184 #if defined (__SUPPORT_LD_DEBUG__)
186 old_val = *reloc_addr;
189 if (reloc_type == R_MIPS_JUMP_SLOT || reloc_type == R_MIPS_COPY) {
191 sym_ref.sym = &symtab[symtab_index];
192 symbol_addr = (unsigned long)_dl_find_hash(symname,
195 elf_machine_type_class(reloc_type), &sym_ref);
196 if (unlikely(!symbol_addr && ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK))
198 if (_dl_trace_prelink) {
199 _dl_debug_lookup (symname, tpnt, &symtab[symtab_index],
200 &sym_ref, elf_machine_type_class(reloc_type));
204 /* Relocs against STN_UNDEF are usually treated as using a
205 * symbol value of zero, and using the module containing the
208 symbol_addr = symtab[symtab_index].st_value;
211 switch (reloc_type) {
212 #if defined USE_TLS && USE_TLS
213 # if _MIPS_SIM == _MIPS_SIM_ABI64
214 case R_MIPS_TLS_DTPMOD64:
215 case R_MIPS_TLS_DTPREL64:
216 case R_MIPS_TLS_TPREL64:
218 case R_MIPS_TLS_DTPMOD32:
219 case R_MIPS_TLS_DTPREL32:
220 case R_MIPS_TLS_TPREL32:
223 struct elf_resolve *tls_tpnt = NULL;
224 sym_ref.sym = &symtab[symtab_index];
227 if (ELF_ST_BIND(symtab[symtab_index].st_info) != STB_LOCAL) {
228 symbol_addr = (unsigned long) _dl_find_hash(symname, scope,
229 tpnt, elf_machine_type_class(reloc_type), &sym_ref);
230 tls_tpnt = sym_ref.tpnt;
232 /* In case of a TLS reloc, tls_tpnt NULL means we have an 'anonymous'
233 symbol. This is the case for a static tls variable, so the lookup
234 module is just that one is referencing the tls variable. */
238 switch (reloc_type) {
239 case R_MIPS_TLS_DTPMOD64:
240 case R_MIPS_TLS_DTPMOD32:
242 *(ElfW(Word) *)reloc_addr = tls_tpnt->l_tls_modid;
245 case R_MIPS_TLS_DTPREL64:
246 case R_MIPS_TLS_DTPREL32:
247 *(ElfW(Word) *)reloc_addr +=
248 TLS_DTPREL_VALUE (symbol_addr);
251 case R_MIPS_TLS_TPREL32:
252 case R_MIPS_TLS_TPREL64:
253 CHECK_STATIC_TLS((struct link_map *)tls_tpnt);
254 *(ElfW(Addr) *)reloc_addr +=
255 TLS_TPREL_VALUE (tls_tpnt, symbol_addr);
262 #if _MIPS_SIM == _MIPS_SIM_ABI64
263 case (R_MIPS_64 << 8) | R_MIPS_REL32:
264 #else /* O32 || N32 */
266 #endif /* O32 || N32 */
268 if (symtab_index < tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX])
270 symtab[symtab_index].st_value +
271 (unsigned long) tpnt->loadaddr;
273 *reloc_addr += got[symtab_index + tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX] -
274 tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX]];
278 *reloc_addr += (unsigned long) tpnt->loadaddr;
281 case R_MIPS_JUMP_SLOT:
282 *reloc_addr = symbol_addr;
286 #if defined (__SUPPORT_LD_DEBUG__)
288 _dl_dprintf(_dl_debug_file,
289 "\n%s move %d bytes from %x to %x",
290 symname, symtab[symtab_index].st_size,
291 symbol_addr, reloc_addr);
294 _dl_memcpy((char *)reloc_addr,
296 symtab[symtab_index].st_size);
303 _dl_dprintf(2, "\n%s: ",_dl_progname);
306 _dl_dprintf(2, "symbol '%s': ", symname);
308 #if defined (__SUPPORT_LD_DEBUG__)
309 _dl_dprintf(2, "can't handle reloc type '%s' in lib '%s'\n", _dl_reltypes(reloc_type), tpnt->libname);
311 _dl_dprintf(2, "can't handle reloc type %x in lib '%s'\n", reloc_type, tpnt->libname);
316 #if defined (__SUPPORT_LD_DEBUG__)
317 if (_dl_debug_reloc && _dl_debug_detail && reloc_addr)
318 _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", old_val, *reloc_addr, reloc_addr);
325 /* Relocate the global GOT entries for the object */
326 void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt, int lazy)
330 unsigned long i, tmp_lazy;
331 unsigned long *got_entry;
333 for (; tpnt ; tpnt = tpnt->next) {
335 /* We don't touch the dynamic linker */
336 if (tpnt->libtype == program_interpreter)
339 /* Setup the loop variables */
340 got_entry = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT])
341 + tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX];
342 sym = (ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB] + tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
343 strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
344 i = tpnt->dynamic_info[DT_MIPS_SYMTABNO_IDX] - tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
346 #if defined (__SUPPORT_LD_DEBUG__)
348 _dl_dprintf(2, "_dl_perform_mips_global_got_relocations for '%s'\n", tpnt->libname);
350 tmp_lazy = lazy && !tpnt->dynamic_info[DT_BIND_NOW];
351 /* Relocate the global GOT entries for the object */
353 if (sym->st_shndx == SHN_UNDEF) {
354 if (ELF_ST_TYPE(sym->st_info) == STT_FUNC && sym->st_value && tmp_lazy) {
355 *got_entry = sym->st_value + (unsigned long) tpnt->loadaddr;
358 *got_entry = (unsigned long) _dl_find_hash(strtab +
359 sym->st_name, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
362 else if (sym->st_shndx == SHN_COMMON) {
363 *got_entry = (unsigned long) _dl_find_hash(strtab +
364 sym->st_name, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
366 else if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
367 *got_entry != sym->st_value && tmp_lazy) {
368 *got_entry += (unsigned long) tpnt->loadaddr;
370 else if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) {
371 if (sym->st_other == 0)
372 *got_entry += (unsigned long) tpnt->loadaddr;
375 struct symbol_ref sym_ref;
378 *got_entry = (unsigned long) _dl_find_hash(strtab +
379 sym->st_name, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, &sym_ref);