uclibc-ng/ldso/ldso/i386/elfinterp.c

/* vi: set sw=4 ts=4: */
/* i386 ELF shared library loader suppport
 *
 * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
 *                              David Engel, Hongjiu Lu and Mitch D'Souza
 * Copyright (C) 2001-2004 Erik Andersen
 *
 * 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.
 */

#include "ldso.h"

#if defined (__SUPPORT_LD_DEBUG__)
static const char *_dl_reltypes_tab[] = {
	[0] "R_386_NONE",     "R_386_32",     "R_386_PC32",     "R_386_GOT32",
	[4] "R_386_PLT32",    "R_386_COPY",   "R_386_GLOB_DAT", "R_386_JMP_SLOT",
	[8] "R_386_RELATIVE", "R_386_GOTOFF", "R_386_GOTPC",
};

static const char *
_dl_reltypes(int type)
{
	static char buf[22];
	const char *str;

	if (type >= (int)(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\n\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__ */

/* 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 long
_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;
	char *rel_addr;
	char *new_addr;
	char **got_addr;
	unsigned long instr_addr;
	char *symname;

	rel_addr = (char *)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_386_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 = ((unsigned long)this_reloc->r_offset +
		      (unsigned long)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 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))
{
	unsigned int i;
	char *strtab;
	Elf32_Sym *symtab;
	ELF_RELOC *rpnt;
	int symtab_index;

	/* Parse the relocation information. */
	rpnt = (ELF_RELOC *)(intptr_t)rel_addr;
	rel_size /= sizeof(ELF_RELOC);

	symtab = (Elf32_Sym *)(intptr_t)tpnt->dynamic_info[DT_SYMTAB];
	strtab = (char *)tpnt->dynamic_info[DT_STRTAB];

	for (i = 0; i < rel_size; i++, rpnt++) {
		int res;

		symtab_index = ELF32_R_SYM(rpnt->r_info);

#if defined (__SUPPORT_LD_DEBUG__)
		debug_sym(symtab, strtab, symtab_index);
		debug_reloc(symtab, strtab, rpnt);
#endif

		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 (unlikely(res < 0)) {
			int reloc_type = ELF32_R_TYPE(rpnt->r_info);

#if defined (__SUPPORT_LD_DEBUG__)
			_dl_dprintf(2, "can't handle reloc type %s\n",
				    _dl_reltypes(reloc_type));
#else
			_dl_dprintf(2, "can't handle reloc type %x\n",
				    reloc_type);
#endif
			_dl_exit(-res);
		} else if (unlikely(res > 0)) {
			_dl_dprintf(2, "can't resolve 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 long 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) {
		symbol_addr = (unsigned long)_dl_find_hash(symname, 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 (unlikely(!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK)) {
			_dl_dprintf(2, "%s: can't resolve symbol '%s'\n", _dl_progname, symname);
			_dl_exit(1);
		};
	}

#if defined (__SUPPORT_LD_DEBUG__)
	old_val = *reloc_addr;
#endif

	switch (reloc_type) {
		case R_386_NONE:
			break;
		case R_386_32:
			*reloc_addr += symbol_addr;
			break;
		case R_386_PC32:
			*reloc_addr += symbol_addr - (unsigned long)reloc_addr;
			break;
		case R_386_GLOB_DAT:
		case R_386_JMP_SLOT:
			*reloc_addr = symbol_addr;
			break;
		case R_386_RELATIVE:
			*reloc_addr += (unsigned long)tpnt->loadaddr;
			break;
		case R_386_COPY:
			if (symbol_addr) {
#if defined (__SUPPORT_LD_DEBUG__)
				if (_dl_debug_move)
					_dl_dprintf(_dl_debug_file,
						    "\n%s move %d bytes from %x to %x",
						    symname, symtab[symtab_index].st_size,
						    symbol_addr, reloc_addr);
#endif

				_dl_memcpy((char *)reloc_addr,
					   (char *)symbol_addr,
					   symtab[symtab_index].st_size);
			}
			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, "\n\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

	(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_386_NONE:
			break;
		case R_386_JMP_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, "\n\tpatched: %x ==> %x @ %x",
			    old_val, *reloc_addr, reloc_addr);
#endif

	return 0;
}

void
_dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
				      unsigned long rel_addr,
				      unsigned long rel_size)
{
	(void)_dl_parse(rpnt->dyn, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
}

int
_dl_parse_relocation_information(struct dyn_elf *rpnt,
				 unsigned long rel_addr,
				 unsigned long rel_size)
{
	return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
}