/* 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) 2001-2002, Erik Andersen
+ * 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.
*
* SUCH DAMAGE.
*/
-#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
+#include "ldso.h"
/* Program to load an ELF binary on a linux system, and run it.
References to symbols in sharable libraries can be resolved by either
extern int _dl_linux_resolve(void);
-unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
+unsigned long
+_dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
{
int reloc_type;
ELF_RELOC *this_reloc;
unsigned long instr_addr;
char *symname;
- rel_addr = (char *) (tpnt->dynamic_info[DT_JMPREL] + tpnt->loadaddr);
-
+ 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] + tpnt->loadaddr);
- strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
- symname= strtab + symtab[symtab_index].st_name;
+ 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 (reloc_type != R_386_JMP_SLOT) {
- _dl_dprintf(2, "%s: Incorrect relocation type in jump relocations\n",
- _dl_progname);
+ 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 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, 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 resolve symbol '%s'\n", _dl_progname, symname);
+ /* 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' in lib '%s'.\n", _dl_progname, symname, tpnt->libname);
_dl_exit(1);
}
#if defined (__SUPPORT_LD_DEBUG__)
- if ((unsigned long) got_addr < 0x40000000)
- {
- if (_dl_debug_bindings)
- {
+ 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\n", *got_addr, new_addr, got_addr);
+ 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;
#endif
- return (unsigned long) 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 (*reloc_fnc)(struct elf_resolve *tpnt, struct dyn_elf *scope,
+ ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab))
{
unsigned int i;
char *strtab;
ELF_RELOC *rpnt;
int symtab_index;
- /* Now parse the relocation information */
- rpnt = (ELF_RELOC *)(intptr_t) (rel_addr + tpnt->loadaddr);
- rel_size = rel_size / sizeof(ELF_RELOC);
+ /* 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] + tpnt->loadaddr);
- strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
+ 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;
- for (i = 0; i < rel_size; i++, rpnt++) {
- int res;
-
symtab_index = ELF32_R_SYM(rpnt->r_info);
-
- /* When the dynamic linker bootstrapped itself, it resolved some symbols.
- Make sure we do not do them 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
+ debug_sym(symtab, strtab, symtab_index);
+ debug_reloc(symtab, strtab, rpnt);
- res = reloc_fnc (tpnt, scope, rpnt, symtab, strtab);
+ res = reloc_fnc(tpnt, scope, rpnt, symtab, strtab);
+
+ if (res == 0)
+ continue;
- if (res==0) continue;
+ _dl_dprintf(2, "\n%s: ", _dl_progname);
- _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);
+ _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));
+ _dl_dprintf(2, "can't handle reloc type '%s' in lib '%s'\n",
+ _dl_reltypes(reloc_type), tpnt->libname);
#else
- _dl_dprintf(2, "can't handle reloc type %x\n", reloc_type);
-#endif
- _dl_exit(-res);
- }
- else if (res >0)
- {
- _dl_dprintf(2, "can't resolve symbol\n");
+ _dl_dprintf(2, "can't handle reloc type %x in lib '%s'\n",
+ reloc_type, tpnt->libname);
+#endif
+ return res;
+ } else if (unlikely(res > 0)) {
+ _dl_dprintf(2, "can't resolve symbol in lib '%s'.\n", tpnt->libname);
return res;
}
- }
- return 0;
-}
+ }
+ return 0;
+}
static int
-_dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
- ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
+_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;
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);
+ 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;
+ symbol_addr = 0;
+ symname = strtab + symtab[symtab_index].st_name;
if (symtab_index) {
-
- symbol_addr = (unsigned long) _dl_find_hash(symname, scope,
- (reloc_type == R_386_JMP_SLOT ? tpnt : NULL), symbolrel);
+ 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.
+ * 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))
+ return 1;
+ }
- 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);
+ old_val = *reloc_addr;
#endif
- return 0;
- }
- }
+ 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__)
- old_val = *reloc_addr;
+ 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
- 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:
- /* handled later on */
- break;
- default:
- return -1; /*call _dl_exit(1) */
- }
+
+ _dl_memcpy((char *)reloc_addr,
+ (char *)symbol_addr,
+ symtab[symtab_index].st_size);
+ }
+ break;
+ default:
+ return -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);
+ 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)
+_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_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; /*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;
-}
-
-/* This is done as a separate step, because there are cases where
- information is first copied and later initialized. This results in
- the wrong information being copied. Someone at Sun was complaining about
- a bug in the handling of _COPY by SVr4, and this may in fact be what he
- was talking about. Sigh. */
-
-/* No, there are cases where the SVr4 linker fails to emit COPY relocs
- at all */
-static int
-_dl_do_copy (struct elf_resolve *tpnt, struct dyn_elf *scope,
- ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
-{
- int reloc_type;
- int symtab_index;
- unsigned long *reloc_addr;
- unsigned long symbol_addr;
- int goof = 0;
- char *symname;
-
- 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_386_COPY)
- return 0;
- 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, NULL, copyrel);
- if (!symbol_addr) goof++;
+ switch (reloc_type) {
+ case R_386_NONE:
+ break;
+ case R_386_JMP_SLOT:
+ *reloc_addr += (unsigned long)tpnt->loadaddr;
+ break;
+ default:
+ return -1;
}
- 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);
+ if (_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\n\tpatched: %x ==> %x @ %x",
+ old_val, *reloc_addr, reloc_addr);
#endif
- _dl_memcpy((char *) symtab[symtab_index].st_value,
- (char *) symbol_addr, symtab[symtab_index].st_size);
- }
- return goof;
-}
-
-void _dl_parse_lazy_relocation_information(struct elf_resolve *tpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
-{
- (void) type;
- (void)_dl_parse(tpnt, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
+ return 0;
}
-int _dl_parse_relocation_information(struct elf_resolve *tpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
+void
+_dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
+ unsigned long rel_addr,
+ unsigned long rel_size)
{
- (void) type;
- return _dl_parse(tpnt, tpnt->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
+ (void)_dl_parse(rpnt->dyn, 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)
+int
+_dl_parse_relocation_information(struct dyn_elf *rpnt,
+ unsigned long rel_addr,
+ unsigned long rel_size)
{
- (void) type;
- return _dl_parse(xpnt->dyn, xpnt->next, rel_addr, rel_size, _dl_do_copy);
+ return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size, _dl_do_reloc);
}
-
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