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- /* vi: set sw=4 ts=4: */
- /* sparc ELF shared library loader suppport
- *
- * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
- * David Engel, Hongjiu Lu and Mitch D'Souza
- *
- * All rights reserved.
- *
- * 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.
- */
- /* 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. */
- /* Disclaimer: I have never seen any AT&T source code for SVr4, nor have
- I ever taken any courses on internals. This program was developed using
- information available through the book "UNIX SYSTEM V RELEASE 4,
- Programmers guide: Ansi C and Programming Support Tools", which did
- a more than adequate job of explaining everything required to get this
- working. */
- extern int _dl_linux_resolve(void);
- unsigned int _dl_linux_resolver(unsigned int reloc_entry, unsigned int * plt)
- {
- int reloc_type;
- Elf32_Rela * this_reloc;
- char * strtab;
- Elf32_Sym * symtab;
- Elf32_Rela * rel_addr;
- struct elf_resolve * tpnt;
- int symtab_index;
- char * new_addr;
- char ** got_addr;
- unsigned int instr_addr;
- tpnt = (struct elf_resolve *) plt[2];
- rel_addr = (Elf32_Rela *)tpnt->dynamic_info[DT_JMPREL];
- /*
- * Generate the correct relocation index into the .rela.plt section.
- */
- reloc_entry = (reloc_entry >> 10) - 0xc;
- this_reloc = (Elf32_Rela *) ((char *) 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 *)tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
- #ifdef __SUPPORT_LD_DEBUG__
- if (_dl_debug_symbols) {
- _dl_dprintf(2, "tpnt = %x\n", tpnt);
- _dl_dprintf(2, "reloc = %x\n", this_reloc);
- _dl_dprintf(2, "symtab = %x\n", symtab);
- _dl_dprintf(2, "strtab = %x\n", strtab);
- }
- #endif
- if (unlikely(reloc_type != R_SPARC_JMP_SLOT)) {
- _dl_dprintf(2, "%s: incorrect relocation type in jump relocations (%d)\n",
- _dl_progname, reloc_type);
- _dl_exit(30);
- };
- /* Address of jump instruction to fix up */
- instr_addr = ((int)this_reloc->r_offset + (int)tpnt->loadaddr);
- got_addr = (char **) instr_addr;
- #ifdef __SUPPORT_LD_DEBUG__
- if (_dl_debug_symbols) {
- _dl_dprintf(2, "symtab_index %x\n", symtab_index);
- _dl_dprintf(2, "Resolving symbol %s\n",
- strtab + symtab[symtab_index].st_name);
- }
- #endif
- /* Get the address of the GOT entry */
- new_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name,
- tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
- if(unlikely(!new_addr)) {
- _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- _dl_exit(31);
- };
- #if defined (__SUPPORT_LD_DEBUG__)
- if ((unsigned long) got_addr < 0x40000000)
- {
- if (_dl_debug_bindings)
- {
- _dl_dprintf(_dl_debug_file, "\nresolve function: %s",
- strtab + symtab[symtab_index].st_name);
- if(_dl_debug_detail) _dl_dprintf(_dl_debug_file,
- "\tpatch %x ==> %x @ %x", *got_addr, new_addr, got_addr);
- }
- }
- if (!_dl_debug_nofixups) {
- got_addr[1] = (char *) (0x03000000 | (((unsigned int) new_addr >> 10) & 0x3fffff));
- got_addr[2] = (char *) (0x81c06000 | ((unsigned int) new_addr & 0x3ff));
- }
- #else
- got_addr[1] = (char *) (0x03000000 | (((unsigned int) new_addr >> 10) & 0x3fffff));
- got_addr[2] = (char *) (0x81c06000 | ((unsigned int) new_addr & 0x3ff));
- #endif
- _dl_dprintf(2, "Address = %x\n",new_addr);
- _dl_exit(32);
- return (unsigned int) new_addr;
- }
- void _dl_parse_lazy_relocation_information(struct dyn_elf *arg_rpnt,
- unsigned long rel_addr, unsigned long rel_size)
- {
- int i;
- char * strtab;
- int reloc_type;
- int symtab_index;
- Elf32_Sym * symtab;
- Elf32_Rela * rpnt;
- unsigned int * reloc_addr;
- struct elf_resolve * tpnt = arg_rpnt->dyn;
- /* Now parse the relocation information */
- rpnt = (Elf32_Rela *)rel_addr;
- symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
- strtab = ( char *)tpnt->dynamic_info[DT_STRTAB];
- for(i=0; i< rel_size; i += sizeof(Elf32_Rela), rpnt++){
- reloc_addr = (int *) (tpnt->loadaddr + (int)rpnt->r_offset);
- reloc_type = ELF32_R_TYPE(rpnt->r_info);
- symtab_index = ELF32_R_SYM(rpnt->r_info);
- switch(reloc_type){
- case R_SPARC_NONE:
- break;
- case R_SPARC_JMP_SLOT:
- break;
- default:
- _dl_dprintf(2, "%s: (LAZY) can't handle reloc type ", _dl_progname);
- #if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2, "%s ", _dl_reltypes_tab[reloc_type]);
- #endif
- if(symtab_index) _dl_dprintf(2, "'%s'\n",
- strtab + symtab[symtab_index].st_name);
- _dl_exit(33);
- };
- };
- }
- int _dl_parse_relocation_information(struct dyn_elf *arg_rpnt,
- unsigned long rel_addr, unsigned long rel_size)
- {
- int i;
- char * strtab;
- int reloc_type;
- int goof = 0;
- Elf32_Sym * symtab;
- Elf32_Rela * rpnt;
- unsigned int * reloc_addr;
- unsigned int symbol_addr;
- int symtab_index;
- struct elf_resolve * tpnt = arg_rpnt->dyn;
- /* Now parse the relocation information */
- rpnt = (Elf32_Rela *)rel_addr;
- symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
- strtab = ( char *)tpnt->dynamic_info[DT_STRTAB];
- for(i=0; i< rel_size; i+= sizeof(Elf32_Rela), rpnt++){
- reloc_addr = (int *) (tpnt->loadaddr + (int)rpnt->r_offset);
- reloc_type = ELF32_R_TYPE(rpnt->r_info);
- symtab_index = ELF32_R_SYM(rpnt->r_info);
- symbol_addr = 0;
- if(symtab_index) {
- symbol_addr = (unsigned int)
- _dl_find_hash(strtab + symtab[symtab_index].st_name,
- tpnt->symbol_scope, tpnt, elf_machine_type_class(reloc_type));
- if(!symbol_addr &&
- ELF32_ST_BIND(symtab [symtab_index].st_info) != STB_WEAK) {
- _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- _dl_exit (1);
- };
- };
- switch(reloc_type){
- case R_SPARC_NONE:
- break;
- case R_SPARC_32:
- *reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_SPARC_DISP32:
- *reloc_addr = symbol_addr + rpnt->r_addend - (unsigned int) reloc_addr;
- break;
- case R_SPARC_GLOB_DAT:
- *reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_SPARC_JMP_SLOT:
- reloc_addr[1] = 0x03000000 | ((symbol_addr >> 10) & 0x3fffff);
- reloc_addr[2] = 0x81c06000 | (symbol_addr & 0x3ff);
- break;
- case R_SPARC_RELATIVE:
- *reloc_addr += (unsigned int) tpnt->loadaddr + rpnt->r_addend;
- break;
- case R_SPARC_HI22:
- if (!symbol_addr)
- symbol_addr = tpnt->loadaddr + rpnt->r_addend;
- else
- symbol_addr += rpnt->r_addend;
- *reloc_addr = (*reloc_addr & 0xffc00000)|(symbol_addr >> 10);
- break;
- case R_SPARC_LO10:
- if (!symbol_addr)
- symbol_addr = tpnt->loadaddr + rpnt->r_addend;
- else
- symbol_addr += rpnt->r_addend;
- *reloc_addr = (*reloc_addr & ~0x3ff)|(symbol_addr & 0x3ff);
- break;
- case R_SPARC_WDISP30:
- *reloc_addr = (*reloc_addr & 0xc0000000)|
- ((symbol_addr - (unsigned int) reloc_addr) >> 2);
- break;
- case R_SPARC_COPY:
- _dl_memcpy((void *) reloc_addr, (void *) symbol_addr, symtab[symtab_index].st_size);
- break;
- default:
- _dl_dprintf(2, "%s: can't handle reloc type ", _dl_progname);
- #if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2, "%s ", _dl_reltypes_tab[reloc_type]);
- #endif
- if (symtab_index)
- _dl_dprintf(2, "'%s'\n", strtab + symtab[symtab_index].st_name);
- _dl_exit(34);
- };
- };
- return goof;
- }
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