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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.
*/
#ifndef VERBOSE_DLINKER
#define VERBOSE_DLINKER
#endif
/* Support for the LD_DEBUG variable. */
#if defined (SUPPORT_LD_DEBUG) || defined (LD_DEBUG_SYMBOLS)
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)
{
static char buf[22];
const char *str;
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";
#ifdef ELF_USES_RELOCA
_dl_dprintf(_dl_debug_file, "\n%s\toffset=%x\taddend=%x %s",
_dl_reltypes(ELF32_R_TYPE(rpnt->r_info)), rpnt->r_offset, rpnt->r_addend, sym);
#else
_dl_dprintf(_dl_debug_file, "\n%s\toffset=%x %s", _dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
rpnt->r_offset, sym);
#endif
}
}
#endif
/* Defined in resolve.S */
extern int _dl_linux_resolve(void);
unsigned long
_dl_linux_resolver(struct elf_resolve *tpnt, int reloc_offset)
{
int reloc_type;
int symtab_index;
char *strtab;
char *new_addr;
char **got_addr;
ELF_RELOC *reloc;
Elf32_Sym *symtab;
Elf32_Addr instr_addr;
reloc = (ELF_RELOC *) (tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr) + (reloc_offset >> 3);
reloc_type = ELF32_R_TYPE(reloc->r_info);
symtab_index = ELF32_R_SYM(reloc->r_info);
symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
if (reloc_type != R_CRIS_JUMP_SLOT) {
_dl_dprintf(_dl_debug_file, "%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 = ((Elf32_Addr) reloc->r_offset + (Elf32_Addr) tpnt->loadaddr);
got_addr = (char **) instr_addr;
#ifdef DL_DEBUG_SYMBOLS
_dl_dprintf(_dl_debug_file, "Resolving symbol: %s\n", strtab + symtab[symtab_index].st_name);
#endif
/* Fetch the address of the GOT entry. */
new_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name, tpnt->symbol_scope, tpnt, 0);
if (!new_addr) {
_dl_dprintf(_dl_debug_file, "%s: Can't resolv symbol '%s'\n", _dl_progname, strtab + symtab[symtab_index].st_name);
_dl_exit(1);
}
#if defined (SUPPORT_LD_DEBUG)
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);
}
#endif
*got_addr = new_addr;
return (unsigned long) new_addr;
}
void
_dl_parse_lazy_relocation_information(struct elf_resolve *tpnt, unsigned long rel_addr, unsigned long rel_size, int type)
{
int i;
int reloc_type;
int symtab_index;
char *strtab;
Elf32_Sym *symtab;
ELF_RELOC *rpnt;
Elf32_Addr *reloc_addr;
/* Parse relocation information. */
rpnt = (ELF_RELOC *) (rel_addr + tpnt->loadaddr);
rel_size = rel_size / sizeof(ELF_RELOC);
symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
for (i = 0; i < rel_size; i++, rpnt++) {
reloc_addr = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) rpnt->r_offset);
reloc_type = ELF32_R_TYPE(rpnt->r_info);
symtab_index = ELF32_R_SYM(rpnt->r_info);
/*
* Make sure we don't resolv the same symbols as we did
* when ld.so bootstrapped itself.
*/
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) || defined (LD_DEBUG_SYMBOLS)
{
unsigned long old_val = *reloc_addr;
#endif
switch (reloc_type) {
case R_CRIS_NONE:
break;
case R_CRIS_JUMP_SLOT:
*reloc_addr += (Elf32_Addr) tpnt->loadaddr;
break;
default:
_dl_dprintf(_dl_debug_file, "%s: Can't handle relocation type (lazy).\n",
_dl_progname);
#ifdef SUPPORT_LD_DEBUG
_dl_dprintf(_dl_debug_file, "%s ", _dl_reltypes(reloc_type));
#endif
if (symtab_index)
_dl_dprintf(_dl_debug_file, "'%s'\n", strtab + symtab[symtab_index].st_name);
_dl_exit(1);
}
#if defined(SUPPORT_LD_DEBUG)
if (_dl_debug_reloc && _dl_debug_detail)
_dl_dprintf(_dl_debug_file, "\tpatch: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr);
}
#endif
}
}
int
_dl_parse_relocation_information(struct elf_resolve *tpnt, unsigned long rel_addr, unsigned long rel_size, int type)
{
int i;
int goof;
int reloc_type;
int symtab_index;
char *strtab;
Elf32_Sym *symtab;
ELF_RELOC *rpnt;
Elf32_Addr *reloc_addr;
Elf32_Addr symbol_addr;
goof = 0;
rpnt = (ELF_RELOC *) (rel_addr + tpnt->loadaddr);
rel_size = rel_size / sizeof(ELF_RELOC);
symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
for (i = 0; i < rel_size; i++, rpnt++) {
reloc_addr = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) 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 && tpnt->libtype == program_interpreter)
continue;
if (symtab_index) {
if (tpnt->libtype == program_interpreter &&
_dl_symbol(strtab + symtab[symtab_index].st_name))
continue;
if (symtab[symtab_index].st_shndx != SHN_UNDEF && ELF32_ST_BIND(symtab[symtab_index].st_info) == STB_LOCAL)
symbol_addr = (Elf32_Addr) tpnt->loadaddr;
else
symbol_addr = (Elf32_Addr) _dl_find_hash(strtab + symtab[symtab_index].st_name,
tpnt->symbol_scope, (reloc_type == R_CRIS_JUMP_SLOT ? tpnt : NULL), 0);
/*
* 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_GLOBAL) {
_dl_dprintf(_dl_debug_file, "%s: Can't resolve '%s'\n",
_dl_progname, strtab + symtab[symtab_index].st_name);
goof++;
}
symbol_addr += rpnt->r_addend;
}
#if defined(SUPPORT_LD_DEBUG)
{
unsigned long old_val = *reloc_addr;
debug_sym(symtab,strtab,symtab_index);
debug_reloc(symtab,strtab,rpnt);
#endif
switch (reloc_type) {
case R_CRIS_GLOB_DAT:
case R_CRIS_JUMP_SLOT:
case R_CRIS_32:
*reloc_addr = symbol_addr;
break;
case R_CRIS_RELATIVE:
*reloc_addr = (Elf32_Addr) tpnt->loadaddr + rpnt->r_addend;
break;
case R_CRIS_COPY:
*reloc_addr = symbol_addr;
break;
case R_CRIS_8:
*(char *) reloc_addr = symbol_addr;
break;
case R_CRIS_16:
*(short *) reloc_addr = symbol_addr;
break;
case R_CRIS_8_PCREL:
*(char *) reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 1;
break;
case R_CRIS_16_PCREL:
*(short *) reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 2;
break;
case R_CRIS_32_PCREL:
*reloc_addr = symbol_addr + rpnt->r_addend - (Elf32_Addr) reloc_addr - 4;
break;
case R_CRIS_NONE:
break;
default:
_dl_dprintf(_dl_debug_file, "%s: Can't handle relocation type ", _dl_progname);
#ifdef SUPPORT_LD_DEBUG
_dl_dprintf(_dl_debug_file, "%s\n", _dl_reltypes(reloc_type));
#endif
if (symtab_index) {
_dl_dprintf(_dl_debug_file, "'%s'\n", strtab + symtab[symtab_index].st_name);
return -1;
}
}
#if defined(SUPPORT_LD_DEBUG)
if (_dl_debug_reloc && _dl_debug_detail)
_dl_dprintf(_dl_debug_file, "\tpatch: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr);
}
#endif
}
return goof;
}
/*
* This is done as a seperate step, because there are cases where
* information is first copied and later initialized. This results
* in the wrong information being copied.
*/
int
_dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr, unsigned long rel_size, int type)
{
int i;
int reloc_type;
int goof;
int symtab_index;
char *strtab;
struct elf_resolve *tpnt;
Elf32_Sym *symtab;
ELF_RELOC *rpnt;
Elf32_Addr *reloc_addr;
Elf32_Addr symbol_addr;
goof = 0;
tpnt = xpnt->dyn;
rpnt = (ELF_RELOC *) (rel_addr + tpnt->loadaddr);
rel_size = rel_size / sizeof(ELF_RELOC);
symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
for (i = 0; i < rel_size; i++, rpnt++) {
reloc_addr = (Elf32_Addr *) (tpnt->loadaddr + (Elf32_Addr) rpnt->r_offset);
reloc_type = ELF32_R_TYPE(rpnt->r_info);
if (reloc_type != R_CRIS_COPY)
continue;
symtab_index = ELF32_R_SYM(rpnt->r_info);
symbol_addr = 0;
if (!symtab_index && tpnt->libtype == program_interpreter)
continue;
if (symtab_index) {
if (tpnt->libtype == program_interpreter &&
_dl_symbol(strtab + symtab[symtab_index].st_name))
continue;
symbol_addr = (Elf32_Addr) _dl_find_hash(strtab +
symtab[symtab_index].st_name, xpnt->next, NULL, 1);
if (!symbol_addr) {
_dl_dprintf(_dl_debug_file, "%s: Can't resolv symbol '%s'\n",
_dl_progname, strtab + symtab[symtab_index].st_name);
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",
strtab + symtab[symtab_index].st_name,
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;
}
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