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[/] [or1k/] [trunk/] [linux/] [uClibc/] [ldso/] [ldso/] [cris/] [elfinterp.c] - Rev 1765
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/* * CRIS ELF shared library loader support. * * Program to load an elf binary on a linux system, and run it. * References to symbols in sharable libraries can be resolved * by either an ELF sharable library or a linux style of shared * library. * * Copyright (C) 2002, Axis Communications AB * All rights reserved * * Author: Tobias Anderberg, <tobiasa@axis.com> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. The name of the above contributors may not be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* Support for the LD_DEBUG variable. */ #if defined (__SUPPORT_LD_DEBUG__) static const char *_dl_reltypes_tab[] = { [0] "R_CRIS_NONE", "R_CRIS_8", "R_CRIS_16", "R_CRIS_32", [4] "R_CRIS_8_PCREL", "R_CRIS_16_PCREL", "R_CRIS_32_PCREL", "R_CRIS_GNU_VTINHERIT", [8] "R_CRIS_GNU_VTENTRY", "R_CRIS_COPY", "R_CRIS_GLOB_DAT", "R_CRIS_JUMP_SLOT", [16] "R_CRIS_RELATIVE", "R_CRIS_16_GOT", "R_CRIS_32_GOT", "R_CRIS_16_GOTPLT", [32] "R_CRIS_32_GOTPLT", "R_CRIS_32_GOTREL", "R_CRIS_32_PLT_GOTREL", "R_CRIS_32_PLT_PCREL", }; static const char * _dl_reltypes(int type) { const char *str; static char buf[22]; if (type >= (sizeof(_dl_reltypes_tab)/sizeof(_dl_reltypes_tab[0])) || NULL == (str = _dl_reltypes_tab[type])) str = _dl_simple_ltoa(buf, (unsigned long) (type)); return str; } static void debug_sym(Elf32_Sym *symtab, char *strtab, int symtab_index) { if (_dl_debug_symbols) { if (symtab_index) { _dl_dprintf(_dl_debug_file, "\n%s\tvalue=%x\tsize=%x\tinfo=%x\tother=%x\tshndx=%x", strtab + symtab[symtab_index].st_name, symtab[symtab_index].st_value, symtab[symtab_index].st_size, symtab[symtab_index].st_info, symtab[symtab_index].st_other, symtab[symtab_index].st_shndx); } } } static void debug_reloc(Elf32_Sym *symtab, char *strtab, ELF_RELOC *rpnt) { if (_dl_debug_reloc) { int symtab_index; const char *sym; symtab_index = ELF32_R_SYM(rpnt->r_info); sym = symtab_index ? strtab + symtab[symtab_index].st_name : "sym=0x0"; if (_dl_debug_symbols) _dl_dprintf(_dl_debug_file, "\n\t"); else _dl_dprintf(_dl_debug_file, "\n%s\n\t", sym); #ifdef ELF_USES_RELOCA _dl_dprintf(_dl_debug_file, "%s\toffset=%x\taddend=%x", _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)), rpnt->r_offset, rpnt->r_addend); #else _dl_dprintf(_dl_debug_file, "%s\toffset%x\n", _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)), rpnt->r_offset); #endif } } #endif /* __SUPPORT_LD_DEBUG__ */ /* Defined in resolve.S. */ extern int _dl_linux_resolv(void); unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry) { int reloc_type; int symtab_index; char *strtab; char *symname; char *new_addr; char *rel_addr; char **got_addr; Elf32_Sym *symtab; ELF_RELOC *this_reloc; unsigned long instr_addr; rel_addr = (char *) (tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr); this_reloc = (ELF_RELOC *) (intptr_t)(rel_addr + reloc_entry); reloc_type = ELF32_R_TYPE(this_reloc->r_info); symtab_index = ELF32_R_SYM(this_reloc->r_info); symtab = (Elf32_Sym *) (intptr_t)(tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr); strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr); symname = strtab + symtab[symtab_index].st_name; if (reloc_type != R_CRIS_JUMP_SLOT) { _dl_dprintf(2, "%s: Incorrect relocation type for jump relocations.\n", _dl_progname); _dl_exit(1); } /* Fetch the address of the jump instruction to fix up. */ instr_addr = ((unsigned long) this_reloc->r_offset + (unsigned long) tpnt->loadaddr); got_addr = (char **) instr_addr; /* Fetch the address of the GOT entry. */ new_addr = _dl_find_hash(symname, tpnt->symbol_scope, tpnt, resolver); if (!new_addr) { new_addr = _dl_find_hash(symname, NULL, NULL, resolver); if (new_addr) return (unsigned long) new_addr; _dl_dprintf(2, "%s: Can't resolv symbol '%s'\n", _dl_progname, symname); _dl_exit(1); } #if defined (__SUPPORT_LD_DEBUG__) if (_dl_debug_bindings) { _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname); if (_dl_debug_detail) _dl_dprintf(_dl_debug_file, "\tpatch %x ==> %x @ %x", *got_addr, new_addr, got_addr); } #endif *got_addr = new_addr; return (unsigned long) new_addr; } static int _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope, unsigned long rel_addr, unsigned long rel_size, int (*reloc_fnc)(struct elf_resolve *tpnt, struct dyn_elf *scope, ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)) { int symtab_index; int res; unsigned int i; char *strtab; Elf32_Sym *symtab; ELF_RELOC *rpnt; /* Parse the relocation information. */ rpnt = (ELF_RELOC *) (intptr_t) (rel_addr + tpnt->loadaddr); rel_size /= sizeof(ELF_RELOC); symtab = (Elf32_Sym *) (intptr_t) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr); strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr); for (i = 0; i < rel_size; i++, rpnt++) { symtab_index = ELF32_R_SYM(rpnt->r_info); /* * Make sure the same symbols that the linker resolved when it * bootstapped itself isn't resolved again. */ if (!symtab_index && tpnt->libtype == program_interpreter) continue; if (symtab_index && tpnt->libtype == program_interpreter && _dl_symbol(strtab + symtab[symtab_index].st_name)) continue; #if defined (__SUPPORT_LD_DEBUG__) debug_sym(symtab, strtab, symtab_index); debug_reloc(symtab, strtab, rpnt); #endif /* Pass over to actual relocation function. */ res = reloc_fnc(tpnt, scope, rpnt, symtab, strtab); if (res == 0) continue; _dl_dprintf(2, "\n%s: ", _dl_progname); if (symtab_index) _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name); if (res < 0) { int reloc_type = ELF32_R_TYPE(rpnt->r_info); #if defined (__SUPPORT_LD_DEBUG__) _dl_dprintf(2, "can't handle relocation type '%s'\n", _dl_reltypes(reloc_type)); #else _dl_dprintf(2, "can't handle relocation type %x\n", reloc_type); #endif _dl_exit(-res); } else if (res > 0) { _dl_dprintf(2, "can't resolv symbol\n"); return res; } } return 0; } static int _dl_do_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope, ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab) { int reloc_type; int symtab_index; char *symname; unsigned long *reloc_addr; unsigned symbol_addr; #if defined (__SUPPORT_LD_DEBUG__) unsigned long old_val; #endif reloc_addr = (unsigned long *)(intptr_t)(tpnt->loadaddr + (unsigned long) rpnt->r_offset); reloc_type = ELF32_R_TYPE(rpnt->r_info); symtab_index = ELF32_R_SYM(rpnt->r_info); symbol_addr = 0; symname = strtab + symtab[symtab_index].st_name; if (symtab_index) { if (symtab[symtab_index].st_shndx != SHN_UNDEF && ELF32_ST_BIND(symtab[symtab_index].st_info) == STB_LOCAL) { symbol_addr = (unsigned long) tpnt->loadaddr; } else { symbol_addr = (unsigned long) _dl_find_hash(symname, scope, (reloc_type == R_CRIS_JUMP_SLOT ? tpnt : NULL), symbolrel); } if (!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) == STB_GLOBAL) { #if defined (__SUPPORT_LD_DEBUG__) _dl_dprintf(2, "\tglobal symbol '%s' already defined in '%s'\n", symname, tpnt->libname); #endif return 0; } symbol_addr += rpnt->r_addend; } #if defined (__SUPPORT_LD_DEBUG__) old_val = *reloc_addr; #endif switch (reloc_type) { case R_CRIS_NONE: break; case R_CRIS_GLOB_DAT: case R_CRIS_JUMP_SLOT: case R_CRIS_32: case R_CRIS_COPY: *reloc_addr = symbol_addr; break; case R_CRIS_RELATIVE: *reloc_addr = (unsigned long) tpnt->loadaddr + rpnt->r_addend; break; default: return -1; /* Call _dl_exit(1). */ } #if defined (__SUPPORT_LD_DEBUG__) if (_dl_debug_reloc && _dl_debug_detail) _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr); #endif return 0; } static int _dl_do_lazy_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope, ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab) { int reloc_type; unsigned long *reloc_addr; #if defined (__SUPPORT_LD_DEBUG__) unsigned long old_val; #endif /* Don't care about these, just keep the compiler happy. */ (void) scope; (void) symtab; (void) strtab; reloc_addr = (unsigned long *)(intptr_t)(tpnt->loadaddr + (unsigned long) rpnt->r_offset); reloc_type = ELF32_R_TYPE(rpnt->r_info); #if defined (__SUPPORT_LD_DEBUG__) old_val = *reloc_addr; #endif switch (reloc_type) { case R_CRIS_NONE: break; case R_CRIS_JUMP_SLOT: *reloc_addr += (unsigned long) tpnt->loadaddr; break; default: return -1; /* Calls _dl_exit(1). */ } #if defined (__SUPPORT_LD_DEBUG__) if (_dl_debug_reloc && _dl_debug_detail) _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr); #endif return 0; } static int _dl_do_copy_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope, ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab) { int goof; int reloc_type; int symtab_index; char *symname; unsigned long *reloc_addr; unsigned long symbol_addr; reloc_addr = (unsigned long *)(intptr_t) (tpnt->loadaddr + (unsigned long) rpnt->r_offset); reloc_type = ELF32_R_TYPE(rpnt->r_info); if (reloc_type != R_CRIS_COPY) return 0; symtab_index = ELF32_R_SYM(rpnt->r_info); symbol_addr = 0; symname = strtab + symtab[symtab_index].st_name; goof = 0; if (symtab_index) { symbol_addr = (unsigned long) _dl_find_hash(symname, scope, NULL, copyrel); if (!symbol_addr) goof++; } if (!goof) { #if defined (__SUPPORT_LD_DEBUG__) if (_dl_debug_move) _dl_dprintf(_dl_debug_file, "\n%s move %x bytes from %x to %x", symname, symtab[symtab_index].st_size, symbol_addr, symtab[symtab_index].st_value); #endif _dl_memcpy((char *) symtab[symtab_index].st_value, (char *) symbol_addr, symtab[symtab_index].st_size); } return goof; } /* External interface to the generic part of the dynamic linker. */ int _dl_parse_relocation_information(struct elf_resolve *tpnt, unsigned long rel_addr, unsigned long rel_size, int type) { /* Keep the compiler happy. */ (void) type; return _dl_parse(tpnt, tpnt->symbol_scope, rel_addr, rel_size, _dl_do_reloc); } void _dl_parse_lazy_relocation_information(struct elf_resolve *tpnt, unsigned long rel_addr, unsigned long rel_size, int type) { /* Keep the compiler happy. */ (void) type; _dl_parse(tpnt, NULL, rel_addr, rel_size, _dl_do_lazy_reloc); } int _dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr, unsigned long rel_size, int type) { /* Keep the compiler happy. */ (void) type; return _dl_parse(xpnt->dyn, xpnt->next, rel_addr, rel_size, _dl_do_copy_reloc); }