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1325 |
phoenix |
/* vi: set sw=4 ts=4: */
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/* mips/mipsel ELF shared library loader suppport
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*
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Copyright (C) 2002, Steven J. Hill (sjhill@realitydiluted.com)
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the above contributors may not be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined (__SUPPORT_LD_DEBUG__)
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static const char *_dl_reltypes_tab[] =
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{
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[0] "R_MIPS_NONE", "R_MIPS_16", "R_MIPS_32",
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[3] "R_MIPS_REL32", "R_MIPS_26", "R_MIPS_HI16",
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[6] "R_MIPS_LO16", "R_MIPS_GPREL16", "R_MIPS_LITERAL",
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[9] "R_MIPS_GOT16", "R_MIPS_PC16", "R_MIPS_CALL16",
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[12] "R_MIPS_GPREL32",
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[16] "R_MIPS_SHIFT5", "R_MIPS_SHIFT6", "R_MIPS_64",
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[19] "R_MIPS_GOT_DISP", "R_MIPS_GOT_PAGE", "R_MIPS_GOT_OFST",
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[22] "R_MIPS_GOT_HI16", "R_MIPS_GOT_LO16", "R_MIPS_SUB",
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[25] "R_MIPS_INSERT_A", "R_MIPS_INSERT_B", "R_MIPS_DELETE",
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[28] "R_MIPS_HIGHER", "R_MIPS_HIGHEST", "R_MIPS_CALL_HI16",
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[31] "R_MIPS_CALL_LO16", "R_MIPS_SCN_DISP", "R_MIPS_REL16",
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[34] "R_MIPS_ADD_IMMEDIATE", "R_MIPS_PJUMP", "R_MIPS_RELGOT",
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[37] "R_MIPS_JALR",
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};
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static const char *
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_dl_reltypes(int type)
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{
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static char buf[22];
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const char *str;
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if (type >= (int)(sizeof (_dl_reltypes_tab)/sizeof(_dl_reltypes_tab[0])) ||
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NULL == (str = _dl_reltypes_tab[type]))
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{
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str =_dl_simple_ltoa( buf, (unsigned long)(type));
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}
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return str;
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}
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static
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void debug_sym(Elf32_Sym *symtab,char *strtab,int symtab_index)
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{
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if(_dl_debug_symbols)
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{
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if(symtab_index){
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_dl_dprintf(_dl_debug_file, "\n%s\n\tvalue=%x\tsize=%x\tinfo=%x\tother=%x\tshndx=%x",
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strtab + symtab[symtab_index].st_name,
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symtab[symtab_index].st_value,
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symtab[symtab_index].st_size,
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symtab[symtab_index].st_info,
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symtab[symtab_index].st_other,
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symtab[symtab_index].st_shndx);
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}
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}
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}
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static void debug_reloc(Elf32_Sym *symtab,char *strtab, ELF_RELOC *rpnt)
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{
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if(_dl_debug_reloc)
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{
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int symtab_index;
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const char *sym;
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symtab_index = ELF32_R_SYM(rpnt->r_info);
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sym = symtab_index ? strtab + symtab[symtab_index].st_name : "sym=0x0";
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if(_dl_debug_symbols)
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_dl_dprintf(_dl_debug_file, "\n\t");
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else
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_dl_dprintf(_dl_debug_file, "\n%s\n\t", sym);
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#ifdef ELF_USES_RELOCA
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_dl_dprintf(_dl_debug_file, "%s\toffset=%x\taddend=%x",
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_dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
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rpnt->r_offset,
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rpnt->r_addend);
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#else
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_dl_dprintf(_dl_debug_file, "%s\toffset=%x\n",
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_dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
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rpnt->r_offset);
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#endif
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}
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}
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#endif
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extern int _dl_linux_resolve(void);
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#define OFFSET_GP_GOT 0x7ff0
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unsigned long _dl_linux_resolver(unsigned long sym_index,
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unsigned long old_gpreg)
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{
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unsigned long *got = (unsigned long *) (old_gpreg - OFFSET_GP_GOT);
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struct elf_resolve *tpnt = (struct elf_resolve *) got[1];
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Elf32_Sym *sym;
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char *strtab;
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unsigned long local_gotno;
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unsigned long gotsym;
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unsigned long new_addr;
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unsigned long instr_addr;
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char **got_addr;
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char *symname;
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gotsym = tpnt->mips_gotsym;
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local_gotno = tpnt->mips_local_gotno;
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sym = ((Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr)) + sym_index;
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strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
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symname = strtab + sym->st_name;
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new_addr = (unsigned long) _dl_find_hash(strtab + sym->st_name,
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tpnt->symbol_scope, tpnt, resolver);
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/* Address of jump instruction to fix up */
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instr_addr = (unsigned long) (got + local_gotno + sym_index - gotsym);
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got_addr = (char **) instr_addr;
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#if defined (__SUPPORT_LD_DEBUG__)
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if (_dl_debug_bindings)
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{
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_dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
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if(_dl_debug_detail) _dl_dprintf(_dl_debug_file,
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"\n\tpatched %x ==> %x @ %x\n", *got_addr, new_addr, got_addr);
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}
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if (!_dl_debug_nofixups) {
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*got_addr = (char*)new_addr;
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}
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#else
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*got_addr = (char*)new_addr;
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#endif
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return new_addr;
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}
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void _dl_parse_lazy_relocation_information(struct elf_resolve *tpnt,
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unsigned long rel_addr, unsigned long rel_size, int type)
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{
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/* Nothing to do */
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return;
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}
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int _dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr,
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unsigned long rel_size, int type)
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{
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/* Nothing to do */
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return 0;
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}
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int _dl_parse_relocation_information(struct elf_resolve *tpnt,
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unsigned long rel_addr, unsigned long rel_size, int type)
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{
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Elf32_Sym *symtab;
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Elf32_Rel *rpnt;
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char *strtab;
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unsigned long *got;
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unsigned long *reloc_addr=NULL, old_val=0;
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unsigned long symbol_addr;
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int i, reloc_type, symtab_index;
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/* Now parse the relocation information */
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rel_size = rel_size / sizeof(Elf32_Rel);
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rpnt = (Elf32_Rel *) (rel_addr + tpnt->loadaddr);
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symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
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strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
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got = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT] + tpnt->loadaddr);
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for (i = 0; i < rel_size; i++, rpnt++) {
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reloc_addr = (unsigned long *) (tpnt->loadaddr +
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(unsigned long) rpnt->r_offset);
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reloc_type = ELF32_R_TYPE(rpnt->r_info);
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symtab_index = ELF32_R_SYM(rpnt->r_info);
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symbol_addr = 0;
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if (!symtab_index && tpnt->libtype == program_interpreter)
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continue;
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#if defined (__SUPPORT_LD_DEBUG__)
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debug_sym(symtab,strtab,symtab_index);
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debug_reloc(symtab,strtab,rpnt);
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old_val = *reloc_addr;
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#endif
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switch (reloc_type) {
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case R_MIPS_REL32:
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if (symtab_index) {
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if (symtab_index < tpnt->mips_gotsym)
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*reloc_addr +=
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symtab[symtab_index].st_value +
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(unsigned long) tpnt->loadaddr;
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else {
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*reloc_addr += got[symtab_index + tpnt->mips_local_gotno -
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tpnt->mips_gotsym];
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}
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}
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else {
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*reloc_addr += (unsigned long) tpnt->loadaddr;
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}
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break;
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case R_MIPS_NONE:
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break;
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default:
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{
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int reloc_type = ELF32_R_TYPE(rpnt->r_info);
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_dl_dprintf(2, "\n%s: ",_dl_progname);
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if (symtab_index)
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_dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
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#if defined (__SUPPORT_LD_DEBUG__)
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_dl_dprintf(2, "can't handle reloc type %s\n ", _dl_reltypes(reloc_type));
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#else
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_dl_dprintf(2, "can't handle reloc type %x\n", reloc_type);
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#endif
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_dl_exit(1);
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}
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};
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};
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#if defined (__SUPPORT_LD_DEBUG__)
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if(_dl_debug_reloc && _dl_debug_detail)
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_dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", old_val, *reloc_addr, reloc_addr);
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#endif
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return 0;
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}
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void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt)
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{
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Elf32_Sym *sym;
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char *strtab;
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unsigned long i;
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unsigned long *got_entry;
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for (; tpnt ; tpnt = tpnt->next) {
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/* We don't touch the dynamic linker */
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if (tpnt->libtype == program_interpreter)
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continue;
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/* Setup the loop variables */
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got_entry = (unsigned long *) (tpnt->loadaddr +
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tpnt->dynamic_info[DT_PLTGOT]) + tpnt->mips_local_gotno;
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sym = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] +
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(unsigned long) tpnt->loadaddr) + tpnt->mips_gotsym;
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strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] +
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(unsigned long) tpnt->loadaddr);
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i = tpnt->mips_symtabno - tpnt->mips_gotsym;
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/* Relocate the global GOT entries for the object */
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while(i--) {
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if (sym->st_shndx == SHN_UNDEF) {
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if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC && sym->st_value)
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*got_entry = sym->st_value + (unsigned long) tpnt->loadaddr;
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else {
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*got_entry = (unsigned long) _dl_find_hash(strtab +
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sym->st_name, tpnt->symbol_scope, NULL, copyrel);
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}
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}
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else if (sym->st_shndx == SHN_COMMON) {
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*got_entry = (unsigned long) _dl_find_hash(strtab +
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sym->st_name, tpnt->symbol_scope, NULL, copyrel);
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}
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285 |
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else if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
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*got_entry != sym->st_value)
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*got_entry += (unsigned long) tpnt->loadaddr;
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288 |
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else if (ELF32_ST_TYPE(sym->st_info) == STT_SECTION) {
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289 |
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if (sym->st_other == 0)
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*got_entry += (unsigned long) tpnt->loadaddr;
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291 |
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}
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292 |
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else {
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293 |
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*got_entry = (unsigned long) _dl_find_hash(strtab +
|
294 |
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sym->st_name, tpnt->symbol_scope, NULL, copyrel);
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}
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296 |
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297 |
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got_entry++;
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sym++;
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}
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300 |
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}
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301 |
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}
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