diff options
Diffstat (limited to 'ldso/ldso/m68k/elfinterp.c')
-rw-r--r-- | ldso/ldso/m68k/elfinterp.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/ldso/ldso/m68k/elfinterp.c b/ldso/ldso/m68k/elfinterp.c new file mode 100644 index 000000000..9b73efd3f --- /dev/null +++ b/ldso/ldso/m68k/elfinterp.c @@ -0,0 +1,358 @@ +/* Run an ELF binary on a linux system. + + Copyright (C) 1993, Eric Youngdale. + Copyright (C) 1995, Andreas Schwab. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Adapted to ELF/68k by Andreas Schwab. */ + +#ifndef VERBOSE_DLINKER +#define VERBOSE_DLINKER +#endif +#ifdef VERBOSE_DLINKER +static 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. */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/unistd.h> +/*#include <stdlib.h>*/ +#include "string.h" +#include <linux/unistd.h> +#include <linux/fcntl.h> +#include <linux/elf.h> + +#include "hash.h" +#include "linuxelf.h" +#include "sysdep.h" +#include "../syscall.h" +#include "../string.h" + +extern char *_dl_progname; + +unsigned int +_dl_linux_resolver (int dummy1, int dummy2, + struct elf_resolve *tpnt, int reloc_entry) +{ + int reloc_type; + struct elf32_rela *this_reloc; + char *strtab; + struct 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 = (struct 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 = (struct elf32_sym *) (tpnt->dynamic_info[DT_SYMTAB] + + tpnt->loadaddr); + strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr); + + + if (reloc_type != R_68K_JMP_SLOT) + { + _dl_fdprintf (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 DEBUG + _dl_fdprintf (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, (int) got_addr, tpnt, 0); + if (!new_addr) + { + _dl_fdprintf (2, "%s: can't resolve symbol '%s'\n", + _dl_progname, strtab + symtab[symtab_index].st_name); + _dl_exit (1); + } +/* #define DEBUG_LIBRARY */ +#ifdef DEBUG_LIBRARY + if ((unsigned int) got_addr < 0x40000000) + _dl_fdprintf (2, "Calling library function: %s\n", + strtab + symtab[symtab_index].st_name); + else +#endif + *got_addr = new_addr; + return (unsigned int) new_addr; +} + +void +_dl_parse_lazy_relocation_information (struct elf_resolve *tpnt, int rel_addr, + int rel_size, int type) +{ + int i; + char *strtab; + int reloc_type; + int symtab_index; + struct elf32_sym *symtab; + struct elf32_rela *rpnt; + unsigned int *reloc_addr; + + /* Now parse the relocation information. */ + rpnt = (struct elf32_rela *) (rel_addr + tpnt->loadaddr); + rel_size = rel_size / sizeof (struct elf32_rela); + + symtab = (struct 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_fdprintf (2, "%s: (LAZY) can't handle reloc type ", _dl_progname); +#ifdef VERBOSE_DLINKER + _dl_fdprintf (2, "%s ", _dl_reltypes[reloc_type]); +#endif + if (symtab_index) + _dl_fdprintf (2, "'%s'", strtab + symtab[symtab_index].st_name); + _dl_fdprintf (2, "\n"); + _dl_exit (1); + } + } +} + +int +_dl_parse_relocation_information (struct elf_resolve *tpnt, int rel_addr, + int rel_size, int type) +{ + int i; + char *strtab; + int reloc_type; + int goof = 0; + struct elf32_sym *symtab; + struct elf32_rela *rpnt; + unsigned int *reloc_addr; + unsigned int symbol_addr; + int symtab_index; + /* Now parse the relocation information */ + + rpnt = (struct elf32_rela *) (rel_addr + tpnt->loadaddr); + rel_size = rel_size / sizeof (struct elf32_rela); + + symtab = (struct 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, (int) reloc_addr, + reloc_type == R_68K_JMP_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_fdprintf (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_fdprintf (2, "Doing copy"); + if (symtab_index) + _dl_fdprintf (2, " for symbol %s", + strtab + symtab[symtab_index].st_name); + _dl_fdprintf (2, "\n"); + _dl_memcpy ((void *) symtab[symtab_index].st_value, + (void *) symbol_addr, + symtab[symtab_index].st_size); +#endif + break; + default: + _dl_fdprintf (2, "%s: can't handle reloc type ", _dl_progname); +#ifdef VERBOSE_DLINKER + _dl_fdprintf (2, "%s ", _dl_reltypes[reloc_type]); +#endif + if (symtab_index) + _dl_fdprintf (2, "'%s'", strtab + symtab[symtab_index].st_name); + _dl_fdprintf (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, int rel_addr, + int rel_size, int type) +{ + int i; + char *strtab; + int reloc_type; + int goof = 0; + struct elf32_sym *symtab; + struct 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 = (struct elf32_rela *) (rel_addr + tpnt->loadaddr); + rel_size = rel_size / sizeof (struct elf32_rela); + + symtab = (struct 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, (int) reloc_addr, NULL, 1); + if (!symbol_addr) + { + _dl_fdprintf (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; +} |