/* m68k ELF shared library loader suppport
*
* Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
- * David Engel, Hongjiu Lu and Mitch D'Souza
+ * David Engel, Hongjiu Lu and Mitch D'Souza
* Adapted to ELF/68k by Andreas Schwab.
*
* All rights reserved.
* SUCH DAMAGE.
*/
-#if defined (__SUPPORT_LD_DEBUG__)
-static const char *_dl_reltypes[] =
-{
- "R_68K_NONE",
- "R_68K_32", "R_68K_16", "R_68K_8",
- "R_68K_PC32", "R_68K_PC16", "R_68K_PC8",
- "R_68K_GOT32", "R_68K_GOT16", "R_68K_GOT8",
- "R_68K_GOT32O", "R_68K_GOT16O", "R_68K_GOT8O",
- "R_68K_PLT32", "R_68K_PLT16", "R_68K_PLT8",
- "R_68K_PLT32O", "R_68K_PLT16O", "R_68K_PLT8O",
- "R_68K_COPY", "R_68K_GLOB_DAT", "R_68K_JMP_SLOT", "R_68K_RELATIVE",
- "R_68K_NUM"
-};
-#endif
-
/* 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. */
a more than adequate job of explaining everything required to get this
working. */
+#include "ldso.h"
-unsigned int _dl_linux_resolver (int dummy1, int dummy2,
- struct elf_resolve *tpnt, int reloc_entry)
+extern int _dl_linux_resolve(void);
+
+unsigned long
+_dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
{
- int reloc_type;
- Elf32_Rela *this_reloc;
- char *strtab;
- Elf32_Sym *symtab;
- char *rel_addr;
- int symtab_index;
- char *new_addr;
- char **got_addr;
- unsigned int instr_addr;
-
- rel_addr = tpnt->loadaddr + tpnt->dynamic_info[DT_JMPREL];
- this_reloc = (Elf32_Rela *) (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 *) (tpnt->dynamic_info[DT_SYMTAB]
- + tpnt->loadaddr);
- strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
-
-
- 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 jump instruction to fix up. */
- instr_addr = (int) this_reloc->r_offset + (int) tpnt->loadaddr;
- got_addr = (char **) instr_addr;
-
-#ifdef __SUPPORT_LD_DEBUG__
- if (_dl_debug_symbols) {
- _dl_dprintf (2, "Resolving symbol %s\n", strtab + symtab[symtab_index].st_name);
- }
-#endif
+ ELF_RELOC *this_reloc;
+ char *strtab;
+ ElfW(Sym) *symtab;
+ int symtab_index;
+ char *rel_addr;
+ char *new_addr;
+ char **got_addr;
+ ElfW(Addr) instr_addr;
+ char *symname;
+
+ rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
+ this_reloc = (ELF_RELOC *)(rel_addr + reloc_entry);
+ symtab_index = ELF_R_SYM(this_reloc->r_info);
+
+ symtab = (ElfW(Sym) *)tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
+ symname = strtab + symtab[symtab_index].st_name;
+
+ /* Address of the jump instruction to fix up. */
+ instr_addr = (this_reloc->r_offset + 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);
+ }
- /* Get the address of the GOT entry. */
- new_addr = _dl_find_hash (strtab + symtab[symtab_index].st_name,
- tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
- if (unlikely(!new_addr))
- {
- _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- _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",
- 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);
+ 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,
+ "\tpatched: %x ==> %x @ %x\n",
+ *got_addr, new_addr, got_addr);
}
}
- if (!_dl_debug_nofixups) {
- *got_addr = new_addr;
- }
-#else
- *got_addr = new_addr;
+ if (!_dl_debug_nofixups)
#endif
+ *got_addr = new_addr;
- return (unsigned int) new_addr;
+ return (unsigned int)new_addr;
}
-void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
+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, ElfW(Sym) *symtab, char *strtab))
{
- int i;
- char *strtab;
- int reloc_type;
- int symtab_index;
- Elf32_Sym *symtab;
- Elf32_Rela *rpnt;
- unsigned int *reloc_addr;
- struct elf_resolve *tpnt = rpnt->dyn;
-
- /* Now parse the relocation information. */
- rpnt = (Elf32_Rela *) (rel_addr + tpnt->loadaddr);
- rel_size = rel_size / sizeof (Elf32_Rela);
-
- 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 = (int *) (tpnt->loadaddr + (int) rpnt->r_offset);
- reloc_type = ELF32_R_TYPE (rpnt->r_info);
- 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 (tpnt->libtype == program_interpreter
- && (!symtab_index
- || _dl_symbol (strtab + symtab[symtab_index].st_name)))
- continue;
-
- 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);
+ unsigned int i;
+ char *strtab;
+ ElfW(Sym) *symtab;
+ ELF_RELOC *rpnt;
+ int symtab_index;
+
+ /* Parse the relocation information. */
+ rpnt = (ELF_RELOC *)rel_addr;
+ rel_size /= sizeof(ELF_RELOC);
+
+ symtab = (ElfW(Sym) *)tpnt->dynamic_info[DT_SYMTAB];
+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
+
+ for (i = 0; i < rel_size; i++, rpnt++) {
+ int res;
+
+ symtab_index = ELF_R_SYM(rpnt->r_info);
+
+ debug_sym(symtab, strtab, symtab_index);
+ debug_reloc(symtab, strtab, rpnt);
+
+ 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 = ELF_R_TYPE(rpnt->r_info);
+
+ _dl_dprintf(2, "can't handle reloc type "
#if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf (2, "%s ", _dl_reltypes[reloc_type]);
+ "%s\n", _dl_reltypes(reloc_type));
+#else
+ "%x\n", reloc_type);
#endif
- if (symtab_index)
- _dl_dprintf (2, "'%s'", strtab + symtab[symtab_index].st_name);
- _dl_dprintf (2, "\n");
- _dl_exit (1);
+ _dl_exit(-res);
+ } else if (unlikely(res > 0)) {
+ _dl_dprintf(2, "can't resolve symbol\n");
+ return res;
+ }
}
- }
+
+ return 0;
}
-int _dl_parse_relocation_information(struct dyn_elf *rpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
+static int
+_dl_do_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope,
+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
{
- 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 = rpnt->dyn;
- /* Now parse the relocation information */
-
- rpnt = (Elf32_Rela *) (rel_addr + tpnt->loadaddr);
- rel_size = rel_size / sizeof (Elf32_Rela);
-
- 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 = (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 (tpnt->libtype == program_interpreter
- && (!symtab_index
- || _dl_symbol (strtab + symtab[symtab_index].st_name)))
- continue;
-
- if (symtab_index)
- {
- symbol_addr = (unsigned int)
- _dl_find_hash (strtab + symtab[symtab_index].st_name,
- tpnt->symbol_scope,
- 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_GLOBAL)
- {
- _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- goof++;
- }
+ int reloc_type;
+ int symtab_index;
+ char *symname;
+ ElfW(Sym) *sym;
+ ElfW(Addr) *reloc_addr;
+ ElfW(Addr) symbol_addr;
+#if defined (__SUPPORT_LD_DEBUG__)
+ ElfW(Addr) old_val;
+#endif
+
+ reloc_addr = (ElfW(Addr)*)(tpnt->loadaddr + (unsigned long)rpnt->r_offset);
+ reloc_type = ELF_R_TYPE(rpnt->r_info);
+ symtab_index = ELF_R_SYM(rpnt->r_info);
+ sym = &symtab[symtab_index];
+ symbol_addr = 0;
+ symname = strtab + sym->st_name;
+
+ if (symtab_index) {
+ symbol_addr = (ElfW(Addr))_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 && ELF_ST_BIND(sym->st_info) != STB_WEAK)) {
+ _dl_dprintf(2, "%s: can't resolve symbol '%s'\n", _dl_progname, symname);
+ _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:
-#if 0 /* Do this later. */
- _dl_dprintf (2, "Doing copy");
- if (symtab_index)
- _dl_dprintf (2, " for symbol %s",
- strtab + symtab[symtab_index].st_name);
- _dl_dprintf (2, "\n");
- _dl_memcpy ((void *) symtab[symtab_index].st_value,
- (void *) symbol_addr,
- symtab[symtab_index].st_size);
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ old_val = *reloc_addr;
#endif
- break;
- default:
- _dl_dprintf (2, "%s: can't handle reloc type ", _dl_progname);
+
+ 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 + rpnt->r_addend;
+ break;
+ /* handled by elf_machine_relative()
+ case R_68K_RELATIVE:
+ *reloc_addr = ((unsigned int) tpnt->loadaddr
+ / * Compatibility kludge. * /
+ + (rpnt->r_addend ? : *reloc_addr));
+ */
+ break;
+ case R_68K_COPY:
+ if (symbol_addr) {
#if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf (2, "%s ", _dl_reltypes[reloc_type]);
+ if (_dl_debug_move)
+ _dl_dprintf(_dl_debug_file,
+ "\t%s move %d bytes from %x to %x\n",
+ symname, sym->st_size,
+ symbol_addr, reloc_addr);
#endif
- if (symtab_index)
- _dl_dprintf (2, "'%s'", strtab + symtab[symtab_index].st_name);
- _dl_dprintf (2, "\n");
- _dl_exit (1);
+ _dl_memcpy ((void *) reloc_addr,
+ (void *) symbol_addr,
+ sym->st_size);
+ } else
+ _dl_dprintf(_dl_debug_file, "no symbol_addr to copy !?\n");
+ break;
+
+ default:
+ return -1; /* Calls _dl_exit(1). */
}
- }
- return goof;
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n",
+ 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. */
+#undef LAZY_RELOC_WORKS
+#ifdef LAZY_RELOC_WORKS
+static int
+_dl_do_lazy_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope,
+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
+{
+ int reloc_type;
+ int symtab_index;
+ ElfW(Addr) *reloc_addr;
+#if defined (__SUPPORT_LD_DEBUG__)
+ ElfW(Addr) old_val;
+#endif
-/* No, there are cases where the SVr4 linker fails to emit COPY relocs
- at all. */
+ (void)scope;
+ symtab_index = ELF_R_SYM(rpnt->r_info);
+ (void)strtab;
-int _dl_parse_copy_information(struct dyn_elf *xpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
-{
- int i;
- char *strtab;
- int reloc_type;
- int goof = 0;
- Elf32_Sym *symtab;
- Elf32_Rela *rpnt;
- unsigned int *reloc_addr;
- unsigned int symbol_addr;
- struct elf_resolve *tpnt;
- int symtab_index;
- /* Now parse the relocation information */
-
- tpnt = xpnt->dyn;
-
- rpnt = (Elf32_Rela *) (rel_addr + tpnt->loadaddr);
- rel_size = rel_size / sizeof (Elf32_Rela);
-
- 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 = (int *) (tpnt->loadaddr + (int) rpnt->r_offset);
- reloc_type = ELF32_R_TYPE (rpnt->r_info);
- if (reloc_type != R_68K_COPY)
- continue;
- symtab_index = ELF32_R_SYM (rpnt->r_info);
- symbol_addr = 0;
- if (tpnt->libtype == program_interpreter
- && (!symtab_index
- || _dl_symbol (strtab + symtab[symtab_index].st_name)))
- continue;
- if (symtab_index)
- {
- symbol_addr = (unsigned int)
- _dl_find_hash (strtab + symtab[symtab_index].st_name,
- xpnt->next, ELF_RTYPE_CLASS_COPY);
- if (!symbol_addr)
- {
- _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
- _dl_progname, strtab + symtab[symtab_index].st_name);
- goof++;
- }
+ reloc_addr = (ElfW(Addr)*)(tpnt->loadaddr + rpnt->r_offset);
+ reloc_type = ELF_R_TYPE(rpnt->r_info);
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ old_val = *reloc_addr;
+#endif
+
+ switch (reloc_type) {
+ case R_68K_NONE:
+ break;
+ case R_68K_JMP_SLOT:
+ *reloc_addr += (unsigned int) tpnt->loadaddr;
+ break;
+ default:
+ _dl_exit(1);
}
- if (!goof)
- _dl_memcpy ((void *) symtab[symtab_index].st_value, (void *) symbol_addr,
- symtab[symtab_index].st_size);
- }
- return goof;
+
+#if defined (__SUPPORT_LD_DEBUG__)
+ if (_dl_debug_reloc && _dl_debug_detail)
+ _dl_dprintf(_dl_debug_file, "\tpatched_lazy: %x ==> %x @ %x\n",
+ old_val, *reloc_addr, reloc_addr);
+#endif
+
+ return 0;
+}
+#endif
+
+void
+_dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
+ unsigned long rel_addr,
+ unsigned long rel_size)
+{
+#ifdef LAZY_RELOC_WORKS
+ (void)_dl_parse(rpnt->dyn, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
+#else
+ _dl_parse_relocation_information(rpnt, rel_addr, rel_size);
+#endif
+}
+
+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);
}
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