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
30 #if defined (__SUPPORT_LD_DEBUG__)
31 static const char *_dl_reltypes_tab[] =
33 [0] "R_MIPS_NONE", "R_MIPS_16", "R_MIPS_32",
34 [3] "R_MIPS_REL32", "R_MIPS_26", "R_MIPS_HI16",
35 [6] "R_MIPS_LO16", "R_MIPS_GPREL16", "R_MIPS_LITERAL",
36 [9] "R_MIPS_GOT16", "R_MIPS_PC16", "R_MIPS_CALL16",
37 [12] "R_MIPS_GPREL32",
38 [16] "R_MIPS_SHIFT5", "R_MIPS_SHIFT6", "R_MIPS_64",
39 [19] "R_MIPS_GOT_DISP", "R_MIPS_GOT_PAGE", "R_MIPS_GOT_OFST",
40 [22] "R_MIPS_GOT_HI16", "R_MIPS_GOT_LO16", "R_MIPS_SUB",
41 [25] "R_MIPS_INSERT_A", "R_MIPS_INSERT_B", "R_MIPS_DELETE",
42 [28] "R_MIPS_HIGHER", "R_MIPS_HIGHEST", "R_MIPS_CALL_HI16",
43 [31] "R_MIPS_CALL_LO16", "R_MIPS_SCN_DISP", "R_MIPS_REL16",
44 [34] "R_MIPS_ADD_IMMEDIATE", "R_MIPS_PJUMP", "R_MIPS_RELGOT",
49 _dl_reltypes(int type)
54 if (type >= (int)(sizeof (_dl_reltypes_tab)/sizeof(_dl_reltypes_tab[0])) ||
55 NULL == (str = _dl_reltypes_tab[type]))
57 str =_dl_simple_ltoa( buf, (unsigned long)(type));
63 void debug_sym(Elf32_Sym *symtab,char *strtab,int symtab_index)
68 _dl_dprintf(_dl_debug_file, "\n%s\n\tvalue=%x\tsize=%x\tinfo=%x\tother=%x\tshndx=%x",
69 strtab + symtab[symtab_index].st_name,
70 symtab[symtab_index].st_value,
71 symtab[symtab_index].st_size,
72 symtab[symtab_index].st_info,
73 symtab[symtab_index].st_other,
74 symtab[symtab_index].st_shndx);
79 static void debug_reloc(Elf32_Sym *symtab,char *strtab, ELF_RELOC *rpnt)
85 symtab_index = ELF32_R_SYM(rpnt->r_info);
86 sym = symtab_index ? strtab + symtab[symtab_index].st_name : "sym=0x0";
89 _dl_dprintf(_dl_debug_file, "\n\t");
91 _dl_dprintf(_dl_debug_file, "\n%s\n\t", sym);
92 #ifdef ELF_USES_RELOCA
93 _dl_dprintf(_dl_debug_file, "%s\toffset=%x\taddend=%x",
94 _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
98 _dl_dprintf(_dl_debug_file, "%s\toffset=%x\n",
99 _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
106 extern int _dl_linux_resolve(void);
108 #define OFFSET_GP_GOT 0x7ff0
110 unsigned long _dl_linux_resolver(unsigned long sym_index,
111 unsigned long old_gpreg)
113 unsigned long *got = (unsigned long *) (old_gpreg - OFFSET_GP_GOT);
114 struct elf_resolve *tpnt = (struct elf_resolve *) got[1];
117 unsigned long local_gotno;
118 unsigned long gotsym;
119 unsigned long new_addr;
120 unsigned long instr_addr;
124 gotsym = tpnt->mips_gotsym;
125 local_gotno = tpnt->mips_local_gotno;
127 sym = ((Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr)) + sym_index;
128 strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
129 symname = strtab + sym->st_name;
131 new_addr = (unsigned long) _dl_find_hash(symname,
132 tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
133 if (unlikely(!new_addr)) {
134 _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
135 _dl_progname, symname);
139 /* Address of jump instruction to fix up */
140 instr_addr = (unsigned long) (got + local_gotno + sym_index - gotsym);
141 got_addr = (char **) instr_addr;
143 #if defined (__SUPPORT_LD_DEBUG__)
144 if (_dl_debug_bindings)
146 _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
147 if(_dl_debug_detail) _dl_dprintf(_dl_debug_file,
148 "\n\tpatched %x ==> %x @ %x\n", *got_addr, new_addr, got_addr);
150 if (!_dl_debug_nofixups) {
151 *got_addr = (char*)new_addr;
154 *got_addr = (char*)new_addr;
160 void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
161 unsigned long rel_addr, unsigned long rel_size)
167 int _dl_parse_copy_information(struct dyn_elf *rpnt,
168 unsigned long rel_addr, unsigned long rel_size)
175 int _dl_parse_relocation_information(struct dyn_elf *xpnt,
176 unsigned long rel_addr, unsigned long rel_size)
182 unsigned long *reloc_addr=NULL;
183 unsigned long symbol_addr;
184 int i, reloc_type, symtab_index;
185 struct elf_resolve *tpnt = xpnt->dyn;
186 #if defined (__SUPPORT_LD_DEBUG__)
187 unsigned long old_val=0;
189 /* Now parse the relocation information */
190 rel_size = rel_size / sizeof(Elf32_Rel);
191 rpnt = (Elf32_Rel *) (rel_addr + tpnt->loadaddr);
193 symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
194 strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
195 got = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT] + tpnt->loadaddr);
197 for (i = 0; i < rel_size; i++, rpnt++) {
198 reloc_addr = (unsigned long *) (tpnt->loadaddr +
199 (unsigned long) rpnt->r_offset);
200 reloc_type = ELF32_R_TYPE(rpnt->r_info);
201 symtab_index = ELF32_R_SYM(rpnt->r_info);
204 #if defined (__SUPPORT_LD_DEBUG__)
205 debug_sym(symtab,strtab,symtab_index);
206 debug_reloc(symtab,strtab,rpnt);
208 old_val = *reloc_addr;
211 switch (reloc_type) {
214 if (symtab_index < tpnt->mips_gotsym)
216 symtab[symtab_index].st_value +
217 (unsigned long) tpnt->loadaddr;
219 *reloc_addr += got[symtab_index + tpnt->mips_local_gotno -
224 *reloc_addr += (unsigned long) tpnt->loadaddr;
231 int reloc_type = ELF32_R_TYPE(rpnt->r_info);
232 _dl_dprintf(2, "\n%s: ",_dl_progname);
235 _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
237 #if defined (__SUPPORT_LD_DEBUG__)
238 _dl_dprintf(2, "can't handle reloc type %s\n ", _dl_reltypes(reloc_type));
240 _dl_dprintf(2, "can't handle reloc type %x\n", reloc_type);
247 #if defined (__SUPPORT_LD_DEBUG__)
248 if(_dl_debug_reloc && _dl_debug_detail && reloc_addr)
249 _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", old_val, *reloc_addr, reloc_addr);
255 void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt)
260 unsigned long *got_entry;
262 for (; tpnt ; tpnt = tpnt->next) {
263 /* Setup the loop variables */
264 got_entry = (unsigned long *) (tpnt->loadaddr +
265 tpnt->dynamic_info[DT_PLTGOT]) + tpnt->mips_local_gotno;
266 sym = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] +
267 (unsigned long) tpnt->loadaddr) + tpnt->mips_gotsym;
268 strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] +
269 (unsigned long) tpnt->loadaddr);
270 i = tpnt->mips_symtabno - tpnt->mips_gotsym;
272 /* Relocate the global GOT entries for the object */
274 if (sym->st_shndx == SHN_UNDEF) {
275 if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC && sym->st_value)
276 *got_entry = sym->st_value + (unsigned long) tpnt->loadaddr;
278 *got_entry = (unsigned long) _dl_find_hash(strtab +
279 sym->st_name, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
282 else if (sym->st_shndx == SHN_COMMON) {
283 *got_entry = (unsigned long) _dl_find_hash(strtab +
284 sym->st_name, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
286 else if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
287 *got_entry != sym->st_value)
288 *got_entry += (unsigned long) tpnt->loadaddr;
289 else if (ELF32_ST_TYPE(sym->st_info) == STT_SECTION) {
290 if (sym->st_other == 0)
291 *got_entry += (unsigned long) tpnt->loadaddr;
294 *got_entry = (unsigned long) _dl_find_hash(strtab +
295 sym->st_name, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);