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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);
- }
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