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- /* vi: set sw=4 ts=4: */
- /* m68k ELF shared library loader suppport
- *
- * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
- * David Engel, Hongjiu Lu and Mitch D'Souza
- * Adapted to ELF/68k by Andreas Schwab.
- *
- * 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. */
- #include "ldso.h"
- extern int _dl_linux_resolve(void);
- unsigned int
- _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
- {
- int reloc_type;
- ELF_RELOC *this_reloc;
- char *strtab;
- Elf32_Sym *symtab;
- int symtab_index;
- ELF_RELOC *rel_addr;
- char *new_addr;
- char **got_addr;
- unsigned int instr_addr;
- char *symname;
- rel_addr = (ELF_RELOC *)tpnt->dynamic_info[DT_JMPREL];
- 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];
- strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
- symname = strtab + symtab[symtab_index].st_name;
- if (unlikely(reloc_type != R_68K_JMP_SLOT)) {
- _dl_dprintf(2, "%s: Incorrect relocation type in jump relocations\n",
- _dl_progname);
- _dl_exit(1);
- }
- /* Address of the jump instruction to fix up. */
- instr_addr = ((int)this_reloc->r_offset + (int)tpnt->loadaddr);
- got_addr = (char **)instr_addr;
- /* Get the address of the GOT entry. */
- new_addr = _dl_find_hash(symname, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
- if (unlikely(!new_addr)) {
- _dl_dprintf(2, "%s: Can't resolve symbol '%s'\n", _dl_progname, symname);
- _dl_exit(1);
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- if ((unsigned long)got_addr < 0x40000000) {
- if (_dl_debug_bindings) {
- _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
- if (_dl_debug_detail)
- _dl_dprintf(_dl_debug_file,
- "\n\tpatched: %x ==> %x @ %x",
- *got_addr, new_addr, got_addr);
- }
- }
- if (!_dl_debug_nofixups) {
- *got_addr = new_addr;
- }
- #else
- *got_addr = new_addr;
- #endif
- 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;
- rel_size = rel_size / sizeof (Elf32_Rela);
- symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
- for (i = 0; i < rel_size; i++, 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_68K_NONE:
- break;
- case R_68K_JMP_SLOT:
- *reloc_addr += (unsigned int) tpnt->loadaddr;
- 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'", strtab + symtab[symtab_index].st_name);
- _dl_dprintf (2, "\n");
- _dl_exit (1);
- }
- }
- }
- 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;
- rel_size = rel_size / sizeof (Elf32_Rela);
- symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
- for (i = 0; i < rel_size; i++, 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));
- /* We want to allow undefined references to weak symbols -
- this might have been intentional. We should not be
- linking local symbols here, so all bases should be
- covered. */
- 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_68K_NONE:
- break;
- case R_68K_8:
- *(char *) reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_68K_16:
- *(short *) reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_68K_32:
- *reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_68K_PC8:
- *(char *) reloc_addr = (symbol_addr + rpnt->r_addend
- - (unsigned int) reloc_addr);
- break;
- case R_68K_PC16:
- *(short *) reloc_addr = (symbol_addr + rpnt->r_addend
- - (unsigned int) reloc_addr);
- break;
- case R_68K_PC32:
- *reloc_addr = (symbol_addr + rpnt->r_addend
- - (unsigned int) reloc_addr);
- break;
- case R_68K_GLOB_DAT:
- case R_68K_JMP_SLOT:
- *reloc_addr = symbol_addr;
- break;
- case R_68K_RELATIVE:
- *reloc_addr = ((unsigned int) tpnt->loadaddr
- /* Compatibility kludge. */
- + (rpnt->r_addend ? : *reloc_addr));
- break;
- case R_68K_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'", strtab + symtab[symtab_index].st_name);
- _dl_dprintf (2, "\n");
- _dl_exit (1);
- }
- }
- return goof;
- }
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