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- /* vi: set sw=4 ts=4: */
- /* m68k ELF shared library loader suppport
- *
- * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
- * David Engel, Hongjiu Lu and Mitch D'Souza
- * Adapted to ELF/68k by Andreas Schwab.
- *
- * 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.
- */
- #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. */
- /* 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. */
- unsigned int _dl_linux_resolver (int dummy1, int dummy2,
- 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
- /* 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 (!_dl_debug_nofixups) {
- *got_addr = new_addr;
- }
- #else
- *got_addr = new_addr;
- #endif
- 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)
- {
- 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);
- 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);
- #if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf (2, "%s ", _dl_reltypes[reloc_type]);
- #endif
- if (symtab_index)
- _dl_dprintf (2, "'%s'", strtab + symtab[symtab_index].st_name);
- _dl_dprintf (2, "\n");
- _dl_exit (1);
- }
- }
- }
- int _dl_parse_relocation_information(struct dyn_elf *rpnt,
- 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;
- 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 (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++;
- }
- }
- 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);
- #endif
- break;
- default:
- _dl_dprintf (2, "%s: can't handle reloc type ", _dl_progname);
- #if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf (2, "%s ", _dl_reltypes[reloc_type]);
- #endif
- if (symtab_index)
- _dl_dprintf (2, "'%s'", strtab + symtab[symtab_index].st_name);
- _dl_dprintf (2, "\n");
- _dl_exit (1);
- }
- }
- return goof;
- }
- /* 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. */
- 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 (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++;
- }
- }
- if (!goof)
- _dl_memcpy ((void *) symtab[symtab_index].st_value, (void *) symbol_addr,
- symtab[symtab_index].st_size);
- }
- return goof;
- }
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