| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini insmod implementation for busybox |
| * |
| * Copyright (C) 1999,2000,2001 by Lineo, inc. |
| * Written by Erik Andersen <andersen@lineo.com> |
| * and Ron Alder <alder@lineo.com> |
| * |
| * Modified by Bryan Rittmeyer <bryan@ixiacom.com> to support SH4 |
| * and (theoretically) SH3. I have only tested SH4 in little endian mode. |
| * |
| * Modified by Alcove, Julien Gaulmin <julien.gaulmin@alcove.fr> and |
| * Nicolas Ferre <nicolas.ferre@alcove.fr> to support ARM7TDMI. Only |
| * very minor changes required to also work with StrongArm and presumably |
| * all ARM based systems. |
| * |
| * Magnus Damm <damm@opensource.se> added PowerPC support 20-Feb-2001. |
| * PowerPC specific code stolen from modutils-2.3.16, |
| * written by Paul Mackerras, Copyright 1996, 1997 Linux International. |
| * I've only tested the code on mpc8xx platforms in big-endian mode. |
| * Did some cleanup and added BB_USE_xxx_ENTRIES... |
| * |
| * Quinn Jensen <jensenq@lineo.com> added MIPS support 23-Feb-2001. |
| * based on modutils-2.4.2 |
| * MIPS specific support for Elf loading and relocation. |
| * Copyright 1996, 1997 Linux International. |
| * Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu> |
| * |
| * Based almost entirely on the Linux modutils-2.3.11 implementation. |
| * Copyright 1996, 1997 Linux International. |
| * New implementation contributed by Richard Henderson <rth@tamu.edu> |
| * Based on original work by Bjorn Ekwall <bj0rn@blox.se> |
| * Restructured (and partly rewritten) by: |
| * Björn Ekwall <bj0rn@blox.se> February 1999 |
| * |
| * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <stddef.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <dirent.h> |
| #include <ctype.h> |
| #include <assert.h> |
| #include <string.h> |
| #include <getopt.h> |
| #include <sys/utsname.h> |
| #include "busybox.h" |
| |
| #ifdef BB_FEATURE_NEW_MODULE_INTERFACE |
| # define new_sys_init_module init_module |
| #else |
| # define old_sys_init_module init_module |
| #endif |
| |
| #if defined(__powerpc__) |
| #define BB_USE_PLT_ENTRIES |
| #define BB_PLT_ENTRY_SIZE 16 |
| #endif |
| |
| #if defined(__arm__) |
| #define BB_USE_PLT_ENTRIES |
| #define BB_PLT_ENTRY_SIZE 8 |
| #define BB_USE_GOT_ENTRIES |
| #define BB_GOT_ENTRY_SIZE 8 |
| #endif |
| |
| #if defined(__sh__) |
| #define BB_USE_GOT_ENTRIES |
| #define BB_GOT_ENTRY_SIZE 4 |
| #endif |
| |
| #if defined(__i386__) |
| #define BB_USE_GOT_ENTRIES |
| #define BB_GOT_ENTRY_SIZE 4 |
| #endif |
| |
| #if defined(__mips__) |
| // neither used |
| #endif |
| |
| //---------------------------------------------------------------------------- |
| //--------modutils module.h, lines 45-242 |
| //---------------------------------------------------------------------------- |
| |
| /* Definitions for the Linux module syscall interface. |
| Copyright 1996, 1997 Linux International. |
| |
| Contributed by Richard Henderson <rth@tamu.edu> |
| |
| This file is part of the Linux modutils. |
| |
| 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 of the License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| |
| #ifndef MODUTILS_MODULE_H |
| static const int MODUTILS_MODULE_H = 1; |
| |
| #ident "$Id: insmod.c,v 1.57 2001/04/05 07:33:10 andersen Exp $" |
| |
| /* This file contains the structures used by the 2.0 and 2.1 kernels. |
| We do not use the kernel headers directly because we do not wish |
| to be dependant on a particular kernel version to compile insmod. */ |
| |
| |
| /*======================================================================*/ |
| /* The structures used by Linux 2.0. */ |
| |
| /* The symbol format used by get_kernel_syms(2). */ |
| struct old_kernel_sym |
| { |
| unsigned long value; |
| char name[60]; |
| }; |
| |
| struct old_module_ref |
| { |
| unsigned long module; /* kernel addresses */ |
| unsigned long next; |
| }; |
| |
| struct old_module_symbol |
| { |
| unsigned long addr; |
| unsigned long name; |
| }; |
| |
| struct old_symbol_table |
| { |
| int size; /* total, including string table!!! */ |
| int n_symbols; |
| int n_refs; |
| struct old_module_symbol symbol[0]; /* actual size defined by n_symbols */ |
| struct old_module_ref ref[0]; /* actual size defined by n_refs */ |
| }; |
| |
| struct old_mod_routines |
| { |
| unsigned long init; |
| unsigned long cleanup; |
| }; |
| |
| struct old_module |
| { |
| unsigned long next; |
| unsigned long ref; /* the list of modules that refer to me */ |
| unsigned long symtab; |
| unsigned long name; |
| int size; /* size of module in pages */ |
| unsigned long addr; /* address of module */ |
| int state; |
| unsigned long cleanup; /* cleanup routine */ |
| }; |
| |
| /* Sent to init_module(2) or'ed into the code size parameter. */ |
| static const int OLD_MOD_AUTOCLEAN = 0x40000000; /* big enough, but no sign problems... */ |
| |
| int get_kernel_syms(struct old_kernel_sym *); |
| int old_sys_init_module(const char *name, char *code, unsigned codesize, |
| struct old_mod_routines *, struct old_symbol_table *); |
| |
| /*======================================================================*/ |
| /* For sizeof() which are related to the module platform and not to the |
| environment isnmod is running in, use sizeof_xx instead of sizeof(xx). */ |
| |
| #define tgt_sizeof_char sizeof(char) |
| #define tgt_sizeof_short sizeof(short) |
| #define tgt_sizeof_int sizeof(int) |
| #define tgt_sizeof_long sizeof(long) |
| #define tgt_sizeof_char_p sizeof(char *) |
| #define tgt_sizeof_void_p sizeof(void *) |
| #define tgt_long long |
| |
| #if defined(__sparc__) && !defined(__sparc_v9__) && defined(ARCH_sparc64) |
| #undef tgt_sizeof_long |
| #undef tgt_sizeof_char_p |
| #undef tgt_sizeof_void_p |
| #undef tgt_long |
| static const int tgt_sizeof_long = 8; |
| static const int tgt_sizeof_char_p = 8; |
| static const int tgt_sizeof_void_p = 8; |
| #define tgt_long long long |
| #endif |
| |
| /*======================================================================*/ |
| /* The structures used in Linux 2.1. */ |
| |
| /* Note: new_module_symbol does not use tgt_long intentionally */ |
| struct new_module_symbol |
| { |
| unsigned long value; |
| unsigned long name; |
| }; |
| |
| struct new_module_persist; |
| |
| struct new_module_ref |
| { |
| unsigned tgt_long dep; /* kernel addresses */ |
| unsigned tgt_long ref; |
| unsigned tgt_long next_ref; |
| }; |
| |
| struct new_module |
| { |
| unsigned tgt_long size_of_struct; /* == sizeof(module) */ |
| unsigned tgt_long next; |
| unsigned tgt_long name; |
| unsigned tgt_long size; |
| |
| tgt_long usecount; |
| unsigned tgt_long flags; /* AUTOCLEAN et al */ |
| |
| unsigned nsyms; |
| unsigned ndeps; |
| |
| unsigned tgt_long syms; |
| unsigned tgt_long deps; |
| unsigned tgt_long refs; |
| unsigned tgt_long init; |
| unsigned tgt_long cleanup; |
| unsigned tgt_long ex_table_start; |
| unsigned tgt_long ex_table_end; |
| #ifdef __alpha__ |
| unsigned tgt_long gp; |
| #endif |
| /* Everything after here is extension. */ |
| unsigned tgt_long persist_start; |
| unsigned tgt_long persist_end; |
| unsigned tgt_long can_unload; |
| unsigned tgt_long runsize; |
| }; |
| |
| struct new_module_info |
| { |
| unsigned long addr; |
| unsigned long size; |
| unsigned long flags; |
| long usecount; |
| }; |
| |
| /* Bits of module.flags. */ |
| static const int NEW_MOD_RUNNING = 1; |
| static const int NEW_MOD_DELETED = 2; |
| static const int NEW_MOD_AUTOCLEAN = 4; |
| static const int NEW_MOD_VISITED = 8; |
| static const int NEW_MOD_USED_ONCE = 16; |
| |
| int new_sys_init_module(const char *name, const struct new_module *); |
| int query_module(const char *name, int which, void *buf, size_t bufsize, |
| size_t *ret); |
| |
| /* Values for query_module's which. */ |
| |
| static const int QM_MODULES = 1; |
| static const int QM_DEPS = 2; |
| static const int QM_REFS = 3; |
| static const int QM_SYMBOLS = 4; |
| static const int QM_INFO = 5; |
| |
| /*======================================================================*/ |
| /* The system calls unchanged between 2.0 and 2.1. */ |
| |
| unsigned long create_module(const char *, size_t); |
| int delete_module(const char *); |
| |
| |
| #endif /* module.h */ |
| |
| //---------------------------------------------------------------------------- |
| //--------end of modutils module.h |
| //---------------------------------------------------------------------------- |
| |
| |
| |
| //---------------------------------------------------------------------------- |
| //--------modutils obj.h, lines 253-462 |
| //---------------------------------------------------------------------------- |
| |
| /* Elf object file loading and relocation routines. |
| Copyright 1996, 1997 Linux International. |
| |
| Contributed by Richard Henderson <rth@tamu.edu> |
| |
| This file is part of the Linux modutils. |
| |
| 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 of the License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| |
| #ifndef MODUTILS_OBJ_H |
| static const int MODUTILS_OBJ_H = 1; |
| |
| #ident "$Id: insmod.c,v 1.57 2001/04/05 07:33:10 andersen Exp $" |
| |
| /* The relocatable object is manipulated using elfin types. */ |
| |
| #include <stdio.h> |
| #include <elf.h> |
| |
| |
| /* Machine-specific elf macros for i386 et al. */ |
| |
| /* the SH changes have only been tested on the SH4 in =little endian= mode */ |
| /* I'm not sure about big endian, so let's warn: */ |
| |
| #if (defined(__SH4__) || defined(__SH3__)) && defined(__BIG_ENDIAN__) |
| #error insmod.c may require changes for use on big endian SH4/SH3 |
| #endif |
| |
| /* it may or may not work on the SH1/SH2... So let's error on those |
| also */ |
| #if (defined(__sh__) && (!(defined(__SH3__) || defined(__SH4__)))) |
| #error insmod.c may require changes for non-SH3/SH4 use |
| #endif |
| |
| #define ELFCLASSM ELFCLASS32 |
| |
| #if defined(__sh__) |
| |
| #define MATCH_MACHINE(x) (x == EM_SH) |
| #define SHT_RELM SHT_RELA |
| #define Elf32_RelM Elf32_Rela |
| #define ELFDATAM ELFDATA2LSB |
| |
| #elif defined(__arm__) |
| |
| #define MATCH_MACHINE(x) (x == EM_ARM) |
| #define SHT_RELM SHT_REL |
| #define Elf32_RelM Elf32_Rel |
| #define ELFDATAM ELFDATA2LSB |
| |
| #elif defined(__powerpc__) |
| |
| #define MATCH_MACHINE(x) (x == EM_PPC) |
| #define SHT_RELM SHT_RELA |
| #define Elf32_RelM Elf32_Rela |
| #define ELFDATAM ELFDATA2MSB |
| |
| #elif defined(__mips__) |
| |
| /* Account for ELF spec changes. */ |
| #ifndef EM_MIPS_RS3_LE |
| #ifdef EM_MIPS_RS4_BE |
| #define EM_MIPS_RS3_LE EM_MIPS_RS4_BE |
| #else |
| #define EM_MIPS_RS3_LE 10 |
| #endif |
| #endif /* !EM_MIPS_RS3_LE */ |
| |
| #define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE) |
| #define SHT_RELM SHT_REL |
| #define Elf32_RelM Elf32_Rel |
| #ifdef __MIPSEB__ |
| #define ELFDATAM ELFDATA2MSB |
| #endif |
| #ifdef __MIPSEL__ |
| #define ELFDATAM ELFDATA2LSB |
| #endif |
| |
| #elif defined(__i386__) |
| |
| /* presumably we can use these for anything but the SH and ARM*/ |
| /* this is the previous behavior, but it does result in |
| insmod.c being broken on anything except i386 */ |
| #ifndef EM_486 |
| #define MATCH_MACHINE(x) (x == EM_386) |
| #else |
| #define MATCH_MACHINE(x) (x == EM_386 || x == EM_486) |
| #endif |
| |
| #define SHT_RELM SHT_REL |
| #define Elf32_RelM Elf32_Rel |
| #define ELFDATAM ELFDATA2LSB |
| |
| #else |
| #error Sorry, but insmod.c does not yet support this architecture... |
| #endif |
| |
| #ifndef ElfW |
| # if ELFCLASSM == ELFCLASS32 |
| # define ElfW(x) Elf32_ ## x |
| # define ELFW(x) ELF32_ ## x |
| # else |
| # define ElfW(x) Elf64_ ## x |
| # define ELFW(x) ELF64_ ## x |
| # endif |
| #endif |
| |
| /* For some reason this is missing from libc5. */ |
| #ifndef ELF32_ST_INFO |
| # define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) |
| #endif |
| |
| #ifndef ELF64_ST_INFO |
| # define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) |
| #endif |
| |
| struct obj_string_patch; |
| struct obj_symbol_patch; |
| |
| struct obj_section |
| { |
| ElfW(Shdr) header; |
| const char *name; |
| char *contents; |
| struct obj_section *load_next; |
| int idx; |
| }; |
| |
| struct obj_symbol |
| { |
| struct obj_symbol *next; /* hash table link */ |
| const char *name; |
| unsigned long value; |
| unsigned long size; |
| int secidx; /* the defining section index/module */ |
| int info; |
| int ksymidx; /* for export to the kernel symtab */ |
| int referenced; /* actually used in the link */ |
| }; |
| |
| /* Hardcode the hash table size. We shouldn't be needing so many |
| symbols that we begin to degrade performance, and we get a big win |
| by giving the compiler a constant divisor. */ |
| |
| #define HASH_BUCKETS 521 |
| |
| struct obj_file |
| { |
| ElfW(Ehdr) header; |
| ElfW(Addr) baseaddr; |
| struct obj_section **sections; |
| struct obj_section *load_order; |
| struct obj_section **load_order_search_start; |
| struct obj_string_patch *string_patches; |
| struct obj_symbol_patch *symbol_patches; |
| int (*symbol_cmp)(const char *, const char *); |
| unsigned long (*symbol_hash)(const char *); |
| unsigned long local_symtab_size; |
| struct obj_symbol **local_symtab; |
| struct obj_symbol *symtab[HASH_BUCKETS]; |
| }; |
| |
| enum obj_reloc |
| { |
| obj_reloc_ok, |
| obj_reloc_overflow, |
| obj_reloc_dangerous, |
| obj_reloc_unhandled |
| }; |
| |
| struct obj_string_patch |
| { |
| struct obj_string_patch *next; |
| int reloc_secidx; |
| ElfW(Addr) reloc_offset; |
| ElfW(Addr) string_offset; |
| }; |
| |
| struct obj_symbol_patch |
| { |
| struct obj_symbol_patch *next; |
| int reloc_secidx; |
| ElfW(Addr) reloc_offset; |
| struct obj_symbol *sym; |
| }; |
| |
| |
| /* Generic object manipulation routines. */ |
| |
| unsigned long obj_elf_hash(const char *); |
| |
| unsigned long obj_elf_hash_n(const char *, unsigned long len); |
| |
| struct obj_symbol *obj_add_symbol (struct obj_file *f, const char *name, |
| unsigned long symidx, int info, int secidx, |
| ElfW(Addr) value, unsigned long size); |
| |
| struct obj_symbol *obj_find_symbol (struct obj_file *f, |
| const char *name); |
| |
| ElfW(Addr) obj_symbol_final_value(struct obj_file *f, |
| struct obj_symbol *sym); |
| |
| void obj_set_symbol_compare(struct obj_file *f, |
| int (*cmp)(const char *, const char *), |
| unsigned long (*hash)(const char *)); |
| |
| struct obj_section *obj_find_section (struct obj_file *f, |
| const char *name); |
| |
| void obj_insert_section_load_order (struct obj_file *f, |
| struct obj_section *sec); |
| |
| struct obj_section *obj_create_alloced_section (struct obj_file *f, |
| const char *name, |
| unsigned long align, |
| unsigned long size); |
| |
| struct obj_section *obj_create_alloced_section_first (struct obj_file *f, |
| const char *name, |
| unsigned long align, |
| unsigned long size); |
| |
| void *obj_extend_section (struct obj_section *sec, unsigned long more); |
| |
| int obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, |
| const char *string); |
| |
| int obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, |
| struct obj_symbol *sym); |
| |
| int obj_check_undefineds(struct obj_file *f); |
| |
| void obj_allocate_commons(struct obj_file *f); |
| |
| unsigned long obj_load_size (struct obj_file *f); |
| |
| int obj_relocate (struct obj_file *f, ElfW(Addr) base); |
| |
| struct obj_file *obj_load(FILE *f); |
| |
| int obj_create_image (struct obj_file *f, char *image); |
| |
| /* Architecture specific manipulation routines. */ |
| |
| struct obj_file *arch_new_file (void); |
| |
| struct obj_section *arch_new_section (void); |
| |
| struct obj_symbol *arch_new_symbol (void); |
| |
| enum obj_reloc arch_apply_relocation (struct obj_file *f, |
| struct obj_section *targsec, |
| struct obj_section *symsec, |
| struct obj_symbol *sym, |
| ElfW(RelM) *rel, ElfW(Addr) value); |
| |
| int arch_create_got (struct obj_file *f); |
| |
| struct new_module; |
| int arch_init_module (struct obj_file *f, struct new_module *); |
| |
| #endif /* obj.h */ |
| //---------------------------------------------------------------------------- |
| //--------end of modutils obj.h |
| //---------------------------------------------------------------------------- |
| |
| |
| |
| |
| |
| #define _PATH_MODULES "/lib/modules" |
| static const int STRVERSIONLEN = 32; |
| |
| /*======================================================================*/ |
| |
| int flag_force_load = 0; |
| int flag_autoclean = 0; |
| int flag_verbose = 0; |
| int flag_export = 1; |
| |
| |
| /*======================================================================*/ |
| |
| /* previously, these were named i386_* but since we could be |
| compiling for the sh, I've renamed them to the more general |
| arch_* These structures are the same between the x86 and SH, |
| and we can't support anything else right now anyway. In the |
| future maybe they should be #if defined'd */ |
| |
| /* Done ;-) */ |
| |
| |
| |
| #if defined(BB_USE_PLT_ENTRIES) |
| struct arch_plt_entry |
| { |
| int offset; |
| int allocated:1; |
| int inited:1; /* has been set up */ |
| }; |
| #endif |
| |
| #if defined(BB_USE_GOT_ENTRIES) |
| struct arch_got_entry { |
| int offset; |
| unsigned offset_done:1; |
| unsigned reloc_done:1; |
| }; |
| #endif |
| |
| #if defined(__mips__) |
| struct mips_hi16 |
| { |
| struct mips_hi16 *next; |
| Elf32_Addr *addr; |
| Elf32_Addr value; |
| }; |
| #endif |
| |
| struct arch_file { |
| struct obj_file root; |
| #if defined(BB_USE_PLT_ENTRIES) |
| struct obj_section *plt; |
| #endif |
| #if defined(BB_USE_GOT_ENTRIES) |
| struct obj_section *got; |
| #endif |
| #if defined(__mips__) |
| struct mips_hi16 *mips_hi16_list; |
| #endif |
| }; |
| |
| struct arch_symbol { |
| struct obj_symbol root; |
| #if defined(BB_USE_PLT_ENTRIES) |
| struct arch_plt_entry pltent; |
| #endif |
| #if defined(BB_USE_GOT_ENTRIES) |
| struct arch_got_entry gotent; |
| #endif |
| }; |
| |
| |
| struct external_module { |
| const char *name; |
| ElfW(Addr) addr; |
| int used; |
| size_t nsyms; |
| struct new_module_symbol *syms; |
| }; |
| |
| struct new_module_symbol *ksyms; |
| size_t nksyms; |
| |
| struct external_module *ext_modules; |
| int n_ext_modules; |
| int n_ext_modules_used; |
| |
| |
| extern int delete_module(const char *); |
| |
| |
| /* This is kind of troublesome. See, we don't actually support |
| the m68k or the arm the same way we support i386 and (now) |
| sh. In doing my SH patch, I just assumed that whatever works |
| for i386 also works for m68k and arm since currently insmod.c |
| does nothing special for them. If this isn't true, the below |
| line is rather misleading IMHO, and someone should either |
| change it or add more proper architecture-dependent support |
| for these boys. |
| |
| -- Bryan Rittmeyer <bryan@ixiacom.com> */ |
| |
| static char m_filename[BUFSIZ + 1]; |
| static char m_fullName[BUFSIZ + 1]; |
| |
| /*======================================================================*/ |
| |
| |
| static int findNamedModule(const char *fileName, struct stat *statbuf, |
| void *userDate) |
| { |
| char *fullName = (char *) userDate; |
| |
| |
| if (fullName[0] == '\0') |
| return (FALSE); |
| else { |
| char *tmp = strrchr((char *) fileName, '/'); |
| |
| if (tmp == NULL) |
| tmp = (char *) fileName; |
| else |
| tmp++; |
| if (check_wildcard_match(tmp, fullName) == TRUE) { |
| /* Stop searching if we find a match */ |
| memcpy(m_filename, fileName, strlen(fileName)+1); |
| return (FALSE); |
| } |
| } |
| return (TRUE); |
| } |
| |
| |
| /*======================================================================*/ |
| |
| struct obj_file *arch_new_file(void) |
| { |
| struct arch_file *f; |
| f = xmalloc(sizeof(*f)); |
| |
| #if defined(BB_USE_PLT_ENTRIES) |
| f->plt = NULL; |
| #endif |
| #if defined(BB_USE_GOT_ENTRIES) |
| f->got = NULL; |
| #endif |
| #if defined(__mips__) |
| f->mips_hi16_list = NULL; |
| #endif |
| |
| return &f->root; |
| } |
| |
| struct obj_section *arch_new_section(void) |
| { |
| return xmalloc(sizeof(struct obj_section)); |
| } |
| |
| struct obj_symbol *arch_new_symbol(void) |
| { |
| struct arch_symbol *sym; |
| sym = xmalloc(sizeof(*sym)); |
| |
| #if defined(BB_USE_PLT_ENTRIES) |
| memset(&sym->pltent, 0, sizeof(sym->pltent)); |
| #endif |
| #if defined(BB_USE_GOT_ENTRIES) |
| memset(&sym->gotent, 0, sizeof(sym->gotent)); |
| #endif |
| |
| return &sym->root; |
| } |
| |
| enum obj_reloc |
| arch_apply_relocation(struct obj_file *f, |
| struct obj_section *targsec, |
| struct obj_section *symsec, |
| struct obj_symbol *sym, |
| ElfW(RelM) *rel, ElfW(Addr) v) |
| { |
| struct arch_file *ifile = (struct arch_file *) f; |
| #if !(defined(__mips__)) |
| struct arch_symbol *isym = (struct arch_symbol *) sym; |
| #endif |
| |
| ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset); |
| ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset; |
| #if defined(BB_USE_GOT_ENTRIES) |
| ElfW(Addr) got = ifile->got ? ifile->got->header.sh_addr : 0; |
| #endif |
| #if defined(BB_USE_PLT_ENTRIES) |
| ElfW(Addr) plt = ifile->plt ? ifile->plt->header.sh_addr : 0; |
| struct arch_plt_entry *pe; |
| unsigned long *ip; |
| #endif |
| enum obj_reloc ret = obj_reloc_ok; |
| |
| switch (ELF32_R_TYPE(rel->r_info)) { |
| |
| /* even though these constants seem to be the same for |
| the i386 and the sh, we "#if define" them for clarity |
| and in case that ever changes */ |
| #if defined(__sh__) |
| case R_SH_NONE: |
| #elif defined(__arm__) |
| case R_ARM_NONE: |
| #elif defined(__i386__) |
| case R_386_NONE: |
| #elif defined(__powerpc__) |
| case R_PPC_NONE: |
| #elif defined(__mips__) |
| case R_MIPS_NONE: |
| #endif |
| break; |
| |
| #if defined(__sh__) |
| case R_SH_DIR32: |
| #elif defined(__arm__) |
| case R_ARM_ABS32: |
| #elif defined(__i386__) |
| case R_386_32: |
| #elif defined(__powerpc__) |
| case R_PPC_ADDR32: |
| #elif defined(__mips__) |
| case R_MIPS_32: |
| #endif |
| *loc += v; |
| break; |
| |
| #if defined(__powerpc__) |
| case R_PPC_ADDR16_HA: |
| *(unsigned short *)loc = (v + 0x8000) >> 16; |
| break; |
| |
| case R_PPC_ADDR16_HI: |
| *(unsigned short *)loc = v >> 16; |
| break; |
| |
| case R_PPC_ADDR16_LO: |
| *(unsigned short *)loc = v; |
| break; |
| #endif |
| |
| #if defined(__mips__) |
| case R_MIPS_26: |
| if (v % 4) |
| ret = obj_reloc_dangerous; |
| if ((v & 0xf0000000) != ((dot + 4) & 0xf0000000)) |
| ret = obj_reloc_overflow; |
| *loc = |
| (*loc & ~0x03ffffff) | ((*loc + (v >> 2)) & |
| 0x03ffffff); |
| break; |
| |
| case R_MIPS_HI16: |
| { |
| struct mips_hi16 *n; |
| |
| /* We cannot relocate this one now because we don't know the value |
| of the carry we need to add. Save the information, and let LO16 |
| do the actual relocation. */ |
| n = (struct mips_hi16 *) xmalloc(sizeof *n); |
| n->addr = loc; |
| n->value = v; |
| n->next = ifile->mips_hi16_list; |
| ifile->mips_hi16_list = n; |
| break; |
| } |
| |
| case R_MIPS_LO16: |
| { |
| unsigned long insnlo = *loc; |
| Elf32_Addr val, vallo; |
| |
| /* Sign extend the addend we extract from the lo insn. */ |
| vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; |
| |
| if (ifile->mips_hi16_list != NULL) { |
| struct mips_hi16 *l; |
| |
| l = ifile->mips_hi16_list; |
| while (l != NULL) { |
| struct mips_hi16 *next; |
| unsigned long insn; |
| |
| /* The value for the HI16 had best be the same. */ |
| assert(v == l->value); |
| |
| /* Do the HI16 relocation. Note that we actually don't |
| need to know anything about the LO16 itself, except where |
| to find the low 16 bits of the addend needed by the LO16. */ |
| insn = *l->addr; |
| val = |
| ((insn & 0xffff) << 16) + |
| vallo; |
| val += v; |
| |
| /* Account for the sign extension that will happen in the |
| low bits. */ |
| val = |
| ((val >> 16) + |
| ((val & 0x8000) != |
| 0)) & 0xffff; |
| |
| insn = (insn & ~0xffff) | val; |
| *l->addr = insn; |
| |
| next = l->next; |
| free(l); |
| l = next; |
| } |
| |
| ifile->mips_hi16_list = NULL; |
| } |
| |
| /* Ok, we're done with the HI16 relocs. Now deal with the LO16. */ |
| val = v + vallo; |
| insnlo = (insnlo & ~0xffff) | (val & 0xffff); |
| *loc = insnlo; |
| break; |
| } |
| #endif |
| |
| #if defined(__arm__) |
| #elif defined(__sh__) |
| case R_SH_REL32: |
| *loc += v - dot; |
| break; |
| #elif defined(__i386__) |
| case R_386_PLT32: |
| case R_386_PC32: |
| *loc += v - dot; |
| break; |
| #elif defined(__powerpc__) |
| case R_PPC_REL32: |
| *loc = v - dot; |
| break; |
| #endif |
| |
| #if defined(__sh__) |
| case R_SH_PLT32: |
| *loc = v - dot; |
| break; |
| #elif defined(__i386__) |
| #endif |
| |
| #if defined(BB_USE_PLT_ENTRIES) |
| |
| #if defined(__arm__) |
| case R_ARM_PC24: |
| case R_ARM_PLT32: |
| #endif |
| #if defined(__powerpc__) |
| case R_PPC_REL24: |
| #endif |
| /* find the plt entry and initialize it if necessary */ |
| assert(isym != NULL); |
| |
| pe = (struct arch_plt_entry*) &isym->pltent; |
| |
| if (! pe->inited) { |
| ip = (unsigned long *) (ifile->plt->contents + pe->offset); |
| |
| /* generate some machine code */ |
| |
| #if defined(__arm__) |
| ip[0] = 0xe51ff004; /* ldr pc,[pc,#-4] */ |
| ip[1] = v; /* sym@ */ |
| #endif |
| #if defined(__powerpc__) |
| ip[0] = 0x3d600000 + ((v + 0x8000) >> 16); /* lis r11,sym@ha */ |
| ip[1] = 0x396b0000 + (v & 0xffff); /* addi r11,r11,sym@l */ |
| ip[2] = 0x7d6903a6; /* mtctr r11 */ |
| ip[3] = 0x4e800420; /* bctr */ |
| #endif |
| pe->inited = 1; |
| } |
| |
| /* relative distance to target */ |
| v -= dot; |
| /* if the target is too far away.... */ |
| if ((int)v < -0x02000000 || (int)v >= 0x02000000) { |
| /* go via the plt */ |
| v = plt + pe->offset - dot; |
| } |
| if (v & 3) |
| ret = obj_reloc_dangerous; |
| |
| /* merge the offset into the instruction. */ |
| #if defined(__arm__) |
| /* Convert to words. */ |
| v >>= 2; |
| |
| *loc = (*loc & ~0x00ffffff) | ((v + *loc) & 0x00ffffff); |
| #endif |
| #if defined(__powerpc__) |
| *loc = (*loc & ~0x03fffffc) | (v & 0x03fffffc); |
| #endif |
| break; |
| #endif /* BB_USE_PLT_ENTRIES */ |
| |
| #if defined(__arm__) |
| #elif defined(__sh__) |
| case R_SH_GLOB_DAT: |
| case R_SH_JMP_SLOT: |
| *loc = v; |
| break; |
| #elif defined(__i386__) |
| case R_386_GLOB_DAT: |
| case R_386_JMP_SLOT: |
| *loc = v; |
| break; |
| #endif |
| |
| #if defined(__arm__) |
| #elif defined(__sh__) |
| case R_SH_RELATIVE: |
| *loc += f->baseaddr + rel->r_addend; |
| break; |
| #elif defined(__i386__) |
| case R_386_RELATIVE: |
| *loc += f->baseaddr; |
| break; |
| #endif |
| |
| #if defined(BB_USE_GOT_ENTRIES) |
| |
| #if defined(__sh__) |
| case R_SH_GOTPC: |
| #elif defined(__arm__) |
| case R_ARM_GOTPC: |
| #elif defined(__i386__) |
| case R_386_GOTPC: |
| #endif |
| assert(got != 0); |
| #if defined(__sh__) |
| *loc += got - dot + rel->r_addend;; |
| #elif defined(__i386__) || defined(__arm__) |
| *loc += got - dot; |
| #endif |
| break; |
| |
| #if defined(__sh__) |
| case R_SH_GOT32: |
| #elif defined(__arm__) |
| case R_ARM_GOT32: |
| #elif defined(__i386__) |
| case R_386_GOT32: |
| #endif |
| assert(isym != NULL); |
| /* needs an entry in the .got: set it, once */ |
| if (!isym->gotent.reloc_done) { |
| isym->gotent.reloc_done = 1; |
| *(ElfW(Addr) *) (ifile->got->contents + isym->gotent.offset) = v; |
| } |
| /* make the reloc with_respect_to_.got */ |
| #if defined(__sh__) |
| *loc += isym->gotent.offset + rel->r_addend; |
| #elif defined(__i386__) || defined(__arm__) |
| *loc += isym->gotent.offset; |
| #endif |
| break; |
| |
| /* address relative to the got */ |
| #if defined(__sh__) |
| case R_SH_GOTOFF: |
| #elif defined(__arm__) |
| case R_ARM_GOTOFF: |
| #elif defined(__i386__) |
| case R_386_GOTOFF: |
| #endif |
| assert(got != 0); |
| *loc += v - got; |
| break; |
| |
| #endif /* BB_USE_GOT_ENTRIES */ |
| |
| default: |
| printf("Warning: unhandled reloc %d\n",(int)ELF32_R_TYPE(rel->r_info)); |
| ret = obj_reloc_unhandled; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| int arch_create_got(struct obj_file *f) |
| { |
| #if defined(BB_USE_GOT_ENTRIES) || defined(BB_USE_PLT_ENTRIES) |
| struct arch_file *ifile = (struct arch_file *) f; |
| int i; |
| #if defined(BB_USE_GOT_ENTRIES) |
| int got_offset = 0, gotneeded = 0; |
| #endif |
| #if defined(BB_USE_PLT_ENTRIES) |
| int plt_offset = 0, pltneeded = 0; |
| #endif |
| struct obj_section *relsec, *symsec, *strsec; |
| ElfW(RelM) *rel, *relend; |
| ElfW(Sym) *symtab, *extsym; |
| const char *strtab, *name; |
| struct arch_symbol *intsym; |
| |
| for (i = 0; i < f->header.e_shnum; ++i) { |
| relsec = f->sections[i]; |
| if (relsec->header.sh_type != SHT_RELM) |
| continue; |
| |
| symsec = f->sections[relsec->header.sh_link]; |
| strsec = f->sections[symsec->header.sh_link]; |
| |
| rel = (ElfW(RelM) *) relsec->contents; |
| relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM))); |
| symtab = (ElfW(Sym) *) symsec->contents; |
| strtab = (const char *) strsec->contents; |
| |
| for (; rel < relend; ++rel) { |
| extsym = &symtab[ELF32_R_SYM(rel->r_info)]; |
| |
| switch (ELF32_R_TYPE(rel->r_info)) { |
| #if defined(__arm__) |
| case R_ARM_GOT32: |
| break; |
| #elif defined(__sh__) |
| case R_SH_GOT32: |
| break; |
| #elif defined(__i386__) |
| case R_386_GOT32: |
| break; |
| #endif |
| |
| #if defined(__powerpc__) |
| case R_PPC_REL24: |
| pltneeded = 1; |
| break; |
| #endif |
| |
| #if defined(__arm__) |
| case R_ARM_PC24: |
| case R_ARM_PLT32: |
| pltneeded = 1; |
| break; |
| |
| case R_ARM_GOTPC: |
| case R_ARM_GOTOFF: |
| gotneeded = 1; |
| if (got_offset == 0) |
| got_offset = 4; |
| #elif defined(__sh__) |
| case R_SH_GOTPC: |
| case R_SH_GOTOFF: |
| gotneeded = 1; |
| #elif defined(__i386__) |
| case R_386_GOTPC: |
| case R_386_GOTOFF: |
| gotneeded = 1; |
| #endif |
| |
| default: |
| continue; |
| } |
| |
| if (extsym->st_name != 0) { |
| name = strtab + extsym->st_name; |
| } else { |
| name = f->sections[extsym->st_shndx]->name; |
| } |
| intsym = (struct arch_symbol *) obj_find_symbol(f, name); |
| #if defined(BB_USE_GOT_ENTRIES) |
| if (!intsym->gotent.offset_done) { |
| intsym->gotent.offset_done = 1; |
| intsym->gotent.offset = got_offset; |
| got_offset += BB_GOT_ENTRY_SIZE; |
| } |
| #endif |
| #if defined(BB_USE_PLT_ENTRIES) |
| if (pltneeded && intsym->pltent.allocated == 0) { |
| intsym->pltent.allocated = 1; |
| intsym->pltent.offset = plt_offset; |
| plt_offset += BB_PLT_ENTRY_SIZE; |
| intsym->pltent.inited = 0; |
| pltneeded = 0; |
| } |
| #endif |
| } |
| } |
| |
| #if defined(BB_USE_GOT_ENTRIES) |
| if (got_offset) { |
| struct obj_section* myrelsec = obj_find_section(f, ".got"); |
| |
| if (myrelsec) { |
| obj_extend_section(myrelsec, got_offset); |
| } else { |
| myrelsec = obj_create_alloced_section(f, ".got", |
| BB_GOT_ENTRY_SIZE, |
| got_offset); |
| assert(myrelsec); |
| } |
| |
| ifile->got = myrelsec; |
| } |
| #endif |
| |
| #if defined(BB_USE_PLT_ENTRIES) |
| if (plt_offset) |
| ifile->plt = obj_create_alloced_section(f, ".plt", |
| BB_PLT_ENTRY_SIZE, |
| plt_offset); |
| #endif |
| #endif |
| return 1; |
| } |
| |
| int arch_init_module(struct obj_file *f, struct new_module *mod) |
| { |
| return 1; |
| } |
| |
| |
| /*======================================================================*/ |
| |
| /* Standard ELF hash function. */ |
| inline unsigned long obj_elf_hash_n(const char *name, unsigned long n) |
| { |
| unsigned long h = 0; |
| unsigned long g; |
| unsigned char ch; |
| |
| while (n > 0) { |
| ch = *name++; |
| h = (h << 4) + ch; |
| if ((g = (h & 0xf0000000)) != 0) { |
| h ^= g >> 24; |
| h &= ~g; |
| } |
| n--; |
| } |
| return h; |
| } |
| |
| unsigned long obj_elf_hash(const char *name) |
| { |
| return obj_elf_hash_n(name, strlen(name)); |
| } |
| |
| #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING |
| /* Get the kernel version in the canonical integer form. */ |
| |
| static int get_kernel_version(char str[STRVERSIONLEN]) |
| { |
| struct utsname uts_info; |
| char *p, *q; |
| int a, b, c; |
| |
| if (uname(&uts_info) < 0) |
| return -1; |
| strncpy(str, uts_info.release, STRVERSIONLEN); |
| p = uts_info.release; |
| |
| a = strtoul(p, &p, 10); |
| if (*p != '.') |
| return -1; |
| b = strtoul(p + 1, &p, 10); |
| if (*p != '.') |
| return -1; |
| c = strtoul(p + 1, &q, 10); |
| if (p + 1 == q) |
| return -1; |
| |
| return a << 16 | b << 8 | c; |
| } |
| |
| /* String comparison for non-co-versioned kernel and module. */ |
| |
| static int ncv_strcmp(const char *a, const char *b) |
| { |
| size_t alen = strlen(a), blen = strlen(b); |
| |
| if (blen == alen + 10 && b[alen] == '_' && b[alen + 1] == 'R') |
| return strncmp(a, b, alen); |
| else if (alen == blen + 10 && a[blen] == '_' && a[blen + 1] == 'R') |
| return strncmp(a, b, blen); |
| else |
| return strcmp(a, b); |
| } |
| |
| /* String hashing for non-co-versioned kernel and module. Here |
| we are simply forced to drop the crc from the hash. */ |
| |
| static unsigned long ncv_symbol_hash(const char *str) |
| { |
| size_t len = strlen(str); |
| if (len > 10 && str[len - 10] == '_' && str[len - 9] == 'R') |
| len -= 10; |
| return obj_elf_hash_n(str, len); |
| } |
| |
| void |
| obj_set_symbol_compare(struct obj_file *f, |
| int (*cmp) (const char *, const char *), |
| unsigned long (*hash) (const char *)) |
| { |
| if (cmp) |
| f->symbol_cmp = cmp; |
| if (hash) { |
| struct obj_symbol *tmptab[HASH_BUCKETS], *sym, *next; |
| int i; |
| |
| f->symbol_hash = hash; |
| |
| memcpy(tmptab, f->symtab, sizeof(tmptab)); |
| memset(f->symtab, 0, sizeof(f->symtab)); |
| |
| for (i = 0; i < HASH_BUCKETS; ++i) |
| for (sym = tmptab[i]; sym; sym = next) { |
| unsigned long h = hash(sym->name) % HASH_BUCKETS; |
| next = sym->next; |
| sym->next = f->symtab[h]; |
| f->symtab[h] = sym; |
| } |
| } |
| } |
| |
| #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */ |
| |
| |
| struct obj_symbol *obj_add_symbol(struct obj_file *f, const char *name, |
| unsigned long symidx, int info, |
| int secidx, ElfW(Addr) value, |
| unsigned long size) |
| { |
| struct obj_symbol *sym; |
| unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS; |
| int n_type = ELFW(ST_TYPE) (info); |
| int n_binding = ELFW(ST_BIND) (info); |
| |
| for (sym = f->symtab[hash]; sym; sym = sym->next) |
| if (f->symbol_cmp(sym->name, name) == 0) { |
| int o_secidx = sym->secidx; |
| int o_info = sym->info; |
| int o_type = ELFW(ST_TYPE) (o_info); |
| int o_binding = ELFW(ST_BIND) (o_info); |
| |
| /* A redefinition! Is it legal? */ |
| |
| if (secidx == SHN_UNDEF) |
| return sym; |
| else if (o_secidx == SHN_UNDEF) |
| goto found; |
| else if (n_binding == STB_GLOBAL && o_binding == STB_LOCAL) { |
| /* Cope with local and global symbols of the same name |
| in the same object file, as might have been created |
| by ld -r. The only reason locals are now seen at this |
| level at all is so that we can do semi-sensible things |
| with parameters. */ |
| |
| struct obj_symbol *nsym, **p; |
| |
| nsym = arch_new_symbol(); |
| nsym->next = sym->next; |
| nsym->ksymidx = -1; |
| |
| /* Excise the old (local) symbol from the hash chain. */ |
| for (p = &f->symtab[hash]; *p != sym; p = &(*p)->next) |
| continue; |
| *p = sym = nsym; |
| goto found; |
| } else if (n_binding == STB_LOCAL) { |
| /* Another symbol of the same name has already been defined. |
| Just add this to the local table. */ |
| sym = arch_new_symbol(); |
| sym->next = NULL; |
| sym->ksymidx = -1; |
| f->local_symtab[symidx] = sym; |
| goto found; |
| } else if (n_binding == STB_WEAK) |
| return sym; |
| else if (o_binding == STB_WEAK) |
| goto found; |
| /* Don't unify COMMON symbols with object types the programmer |
| doesn't expect. */ |
| else if (secidx == SHN_COMMON |
| && (o_type == STT_NOTYPE || o_type == STT_OBJECT)) |
| return sym; |
| else if (o_secidx == SHN_COMMON |
| && (n_type == STT_NOTYPE || n_type == STT_OBJECT)) |
| goto found; |
| else { |
| /* Don't report an error if the symbol is coming from |
| the kernel or some external module. */ |
| if (secidx <= SHN_HIRESERVE) |
| error_msg("%s multiply defined", name); |
| return sym; |
| } |
| } |
| |
| /* Completely new symbol. */ |
| sym = arch_new_symbol(); |
| sym->next = f->symtab[hash]; |
| f->symtab[hash] = sym; |
| sym->ksymidx = -1; |
| |
| if (ELFW(ST_BIND) (info) == STB_LOCAL) |
| f->local_symtab[symidx] = sym; |
| |
| found: |
| sym->name = name; |
| sym->value = value; |
| sym->size = size; |
| sym->secidx = secidx; |
| sym->info = info; |
| |
| return sym; |
| } |
| |
| struct obj_symbol *obj_find_symbol(struct obj_file *f, const char *name) |
| { |
| struct obj_symbol *sym; |
| unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS; |
| |
| for (sym = f->symtab[hash]; sym; sym = sym->next) |
| if (f->symbol_cmp(sym->name, name) == 0) |
| return sym; |
| |
| return NULL; |
| } |
| |
| ElfW(Addr) |
| obj_symbol_final_value(struct obj_file * f, struct obj_symbol * sym) |
| { |
| if (sym) { |
| if (sym->secidx >= SHN_LORESERVE) |
| return sym->value; |
| |
| return sym->value + f->sections[sym->secidx]->header.sh_addr; |
| } else { |
| /* As a special case, a NULL sym has value zero. */ |
| return 0; |
| } |
| } |
| |
| struct obj_section *obj_find_section(struct obj_file *f, const char *name) |
| { |
| int i, n = f->header.e_shnum; |
| |
| for (i = 0; i < n; ++i) |
| if (strcmp(f->sections[i]->name, name) == 0) |
| return f->sections[i]; |
| |
| return NULL; |
| } |
| |
| static int obj_load_order_prio(struct obj_section *a) |
| { |
| unsigned long af, ac; |
| |
| af = a->header.sh_flags; |
| |
| ac = 0; |
| if (a->name[0] != '.' || strlen(a->name) != 10 || |
| strcmp(a->name + 5, ".init")) |
| ac |= 32; |
| if (af & SHF_ALLOC) |
| ac |= 16; |
| if (!(af & SHF_WRITE)) |
| ac |= 8; |
| if (af & SHF_EXECINSTR) |
| ac |= 4; |
| if (a->header.sh_type != SHT_NOBITS) |
| ac |= 2; |
| |
| return ac; |
| } |
| |
| void |
| obj_insert_section_load_order(struct obj_file *f, struct obj_section *sec) |
| { |
| struct obj_section **p; |
| int prio = obj_load_order_prio(sec); |
| for (p = f->load_order_search_start; *p; p = &(*p)->load_next) |
| if (obj_load_order_prio(*p) < prio) |
| break; |
| sec->load_next = *p; |
| *p = sec; |
| } |
| |
| struct obj_section *obj_create_alloced_section(struct obj_file *f, |
| const char *name, |
| unsigned long align, |
| unsigned long size) |
| { |
| int newidx = f->header.e_shnum++; |
| struct obj_section *sec; |
| |
| f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec)); |
| f->sections[newidx] = sec = arch_new_section(); |
| |
| memset(sec, 0, sizeof(*sec)); |
| sec->header.sh_type = SHT_PROGBITS; |
| sec->header.sh_flags = SHF_WRITE | SHF_ALLOC; |
| sec->header.sh_size = size; |
| sec->header.sh_addralign = align; |
| sec->name = name; |
| sec->idx = newidx; |
| if (size) |
| sec->contents = xmalloc(size); |
| |
| obj_insert_section_load_order(f, sec); |
| |
| return sec; |
| } |
| |
| struct obj_section *obj_create_alloced_section_first(struct obj_file *f, |
| const char *name, |
| unsigned long align, |
| unsigned long size) |
| { |
| int newidx = f->header.e_shnum++; |
| struct obj_section *sec; |
| |
| f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec)); |
| f->sections[newidx] = sec = arch_new_section(); |
| |
| memset(sec, 0, sizeof(*sec)); |
| sec->header.sh_type = SHT_PROGBITS; |
| sec->header.sh_flags = SHF_WRITE | SHF_ALLOC; |
| sec->header.sh_size = size; |
| sec->header.sh_addralign = align; |
| sec->name = name; |
| sec->idx = newidx; |
| if (size) |
| sec->contents = xmalloc(size); |
| |
| sec->load_next = f->load_order; |
| f->load_order = sec; |
| if (f->load_order_search_start == &f->load_order) |
| f->load_order_search_start = &sec->load_next; |
| |
| return sec; |
| } |
| |
| void *obj_extend_section(struct obj_section *sec, unsigned long more) |
| { |
| unsigned long oldsize = sec->header.sh_size; |
| sec->contents = xrealloc(sec->contents, sec->header.sh_size += more); |
| return sec->contents + oldsize; |
| } |
| |
| |
| |
| /* Conditionally add the symbols from the given symbol set to the |
| new module. */ |
| |
| static int |
| add_symbols_from( |
| struct obj_file *f, |
| int idx, struct new_module_symbol *syms, size_t nsyms) |
| { |
| struct new_module_symbol *s; |
| size_t i; |
| int used = 0; |
| |
| for (i = 0, s = syms; i < nsyms; ++i, ++s) { |
| |
| /* Only add symbols that are already marked external. If we |
| override locals we may cause problems for argument initialization. |
| We will also create a false dependency on the module. */ |
| struct obj_symbol *sym; |
| |
| sym = obj_find_symbol(f, (char *) s->name); |
| if (sym && !ELFW(ST_BIND) (sym->info) == STB_LOCAL) { |
| sym = obj_add_symbol(f, (char *) s->name, -1, |
| ELFW(ST_INFO) (STB_GLOBAL, STT_NOTYPE), |
| idx, s->value, 0); |
| /* Did our symbol just get installed? If so, mark the |
| module as "used". */ |
| if (sym->secidx == idx) |
| used = 1; |
| } |
| } |
| |
| return used; |
| } |
| |
| static void add_kernel_symbols(struct obj_file *f) |
| { |
| struct external_module *m; |
| int i, nused = 0; |
| |
| /* Add module symbols first. */ |
| |
| for (i = 0, m = ext_modules; i < n_ext_modules; ++i, ++m) |
| if (m->nsyms |
| && add_symbols_from(f, SHN_HIRESERVE + 2 + i, m->syms, |
| m->nsyms)) m->used = 1, ++nused; |
| |
| n_ext_modules_used = nused; |
| |
| /* And finally the symbols from the kernel proper. */ |
| |
| if (nksyms) |
| add_symbols_from(f, SHN_HIRESERVE + 1, ksyms, nksyms); |
| } |
| |
| static char *get_modinfo_value(struct obj_file *f, const char *key) |
| { |
| struct obj_section *sec; |
| char *p, *v, *n, *ep; |
| size_t klen = strlen(key); |
| |
| sec = obj_find_section(f, ".modinfo"); |
| if (sec == NULL) |
| return NULL; |
| p = sec->contents; |
| ep = p + sec->header.sh_size; |
| while (p < ep) { |
| v = strchr(p, '='); |
| n = strchr(p, '\0'); |
| if (v) { |
| if (p + klen == v && strncmp(p, key, klen) == 0) |
| return v + 1; |
| } else { |
| if (p + klen == n && strcmp(p, key) == 0) |
| return n; |
| } |
| p = n + 1; |
| } |
| |
| return NULL; |
| } |
| |
| |
| /*======================================================================*/ |
| /* Functions relating to module loading in pre 2.1 kernels. */ |
| |
| static int |
| old_process_module_arguments(struct obj_file *f, int argc, char **argv) |
| { |
| while (argc > 0) { |
| char *p, *q; |
| struct obj_symbol *sym; |
| int *loc; |
| |
| p = *argv; |
| if ((q = strchr(p, '=')) == NULL) { |
| argc--; |
| continue; |
| } |
| *q++ = '\0'; |
| |
| sym = obj_find_symbol(f, p); |
| |
| /* Also check that the parameter was not resolved from the kernel. */ |
| if (sym == NULL || sym->secidx > SHN_HIRESERVE) { |
| error_msg("symbol for parameter %s not found", p); |
| return 0; |
| } |
| |
| loc = (int *) (f->sections[sym->secidx]->contents + sym->value); |
| |
| /* Do C quoting if we begin with a ". */ |
| if (*q == '"') { |
| char *r, *str; |
| |
| str = alloca(strlen(q)); |
| for (r = str, q++; *q != '"'; ++q, ++r) { |
| if (*q == '\0') { |
| error_msg("improperly terminated string argument for %s", p); |
| return 0; |
| } else if (*q == '\\') |
| switch (*++q) { |
| case 'a': |
| *r = '\a'; |
| break; |
| case 'b': |
| *r = '\b'; |
| break; |
| case 'e': |
| *r = '\033'; |
| break; |
| case 'f': |
| *r = '\f'; |
| break; |
| case 'n': |
| *r = '\n'; |
| break; |
| case 'r': |
| *r = '\r'; |
| break; |
| case 't': |
| *r = '\t'; |
| break; |
| |
| case '0': |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| { |
| int c = *q - '0'; |
| if (q[1] >= '0' && q[1] <= '7') { |
| c = (c * 8) + *++q - '0'; |
| if (q[1] >= '0' && q[1] <= '7') |
| c = (c * 8) + *++q - '0'; |
| } |
| *r = c; |
| } |
| break; |
| |
| default: |
| *r = *q; |
| break; |
| } else |
| *r = *q; |
| } |
| *r = '\0'; |
| obj_string_patch(f, sym->secidx, sym->value, str); |
| } else if (*q >= '0' && *q <= '9') { |
| do |
| *loc++ = strtoul(q, &q, 0); |
| while (*q++ == ','); |
| } else { |
| char *contents = f->sections[sym->secidx]->contents; |
| char *myloc = contents + sym->value; |
| char *r; /* To search for commas */ |
| |
| /* Break the string with comas */ |
| while ((r = strchr(q, ',')) != (char *) NULL) { |
| *r++ = '\0'; |
| obj_string_patch(f, sym->secidx, myloc - contents, q); |
| myloc += sizeof(char *); |
| q = r; |
| } |
| |
| /* last part */ |
| obj_string_patch(f, sym->secidx, myloc - contents, q); |
| } |
| |
| argc--, argv++; |
| } |
| |
| return 1; |
| } |
| |
| #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING |
| static int old_is_module_checksummed(struct obj_file *f) |
| { |
| return obj_find_symbol(f, "Using_Versions") != NULL; |
| } |
| /* Get the module's kernel version in the canonical integer form. */ |
| |
| static int |
| old_get_module_version(struct obj_file *f, char str[STRVERSIONLEN]) |
| { |
| struct obj_symbol *sym; |
| char *p, *q; |
| int a, b, c; |
| |
| sym = obj_find_symbol(f, "kernel_version"); |
| if (sym == NULL) |
| return -1; |
| |
| p = f->sections[sym->secidx]->contents + sym->value; |
| strncpy(str, p, STRVERSIONLEN); |
| |
| a = strtoul(p, &p, 10); |
| if (*p != '.') |
| return -1; |
| b = strtoul(p + 1, &p, 10); |
| if (*p != '.') |
| return -1; |
| c = strtoul(p + 1, &q, 10); |
| if (p + 1 == q) |
| return -1; |
| |
| return a << 16 | b << 8 | c; |
| } |
| |
| #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */ |
| |
| #ifdef BB_FEATURE_OLD_MODULE_INTERFACE |
| |
| /* Fetch all the symbols and divvy them up as appropriate for the modules. */ |
| |
| static int old_get_kernel_symbols(const char *m_name) |
| { |
| struct old_kernel_sym *ks, *k; |
| struct new_module_symbol *s; |
| struct external_module *mod; |
| int nks, nms, nmod, i; |
| |
| nks = get_kernel_syms(NULL); |
| if (nks < 0) { |
| perror_msg("get_kernel_syms: %s", m_name); |
| return 0; |
| } |
| |
| ks = k = xmalloc(nks * sizeof(*ks)); |
| |
| if (get_kernel_syms(ks) != nks) { |
| perror("inconsistency with get_kernel_syms -- is someone else " |
| "playing with modules?"); |
| free(ks); |
| return 0; |
| } |
| |
| /* Collect the module information. */ |
| |
| mod = NULL; |
| nmod = -1; |
| |
| while (k->name[0] == '#' && k->name[1]) { |
| struct old_kernel_sym *k2; |
| struct new_module_symbol *s; |
| |
| /* Find out how many symbols this module has. */ |
| for (k2 = k + 1; k2->name[0] != '#'; ++k2) |
| continue; |
| nms = k2 - k - 1; |
| |
| mod = xrealloc(mod, (++nmod + 1) * sizeof(*mod)); |
| mod[nmod].name = k->name + 1; |
| mod[nmod].addr = k->value; |
| mod[nmod].used = 0; |
| mod[nmod].nsyms = nms; |
| mod[nmod].syms = s = (nms ? xmalloc(nms * sizeof(*s)) : NULL); |
| |
| for (i = 0, ++k; i < nms; ++i, ++s, ++k) { |
| s->name = (unsigned long) k->name; |
| s->value = k->value; |
| } |
| |
| k = k2; |
| } |
| |
| ext_modules = mod; |
| n_ext_modules = nmod + 1; |
| |
| /* Now collect the symbols for the kernel proper. */ |
| |
| if (k->name[0] == '#') |
| ++k; |
| |
| nksyms = nms = nks - (k - ks); |
| ksyms = s = (nms ? xmalloc(nms * sizeof(*s)) : NULL); |
| |
| for (i = 0; i < nms; ++i, ++s, ++k) { |
| s->name = (unsigned long) k->name; |
| s->value = k->value; |
| } |
| |
| return 1; |
| } |
| |
| /* Return the kernel symbol checksum version, or zero if not used. */ |
| |
| static int old_is_kernel_checksummed(void) |
| { |
| /* Using_Versions is the first symbol. */ |
| if (nksyms > 0 |
| && strcmp((char *) ksyms[0].name, |
| "Using_Versions") == 0) return ksyms[0].value; |
| else |
| return 0; |
| } |
| |
| |
| static int old_create_mod_use_count(struct obj_file *f) |
| { |
| struct obj_section *sec; |
| |
| sec = obj_create_alloced_section_first(f, ".moduse", sizeof(long), |
| sizeof(long)); |
| |
| obj_add_symbol(f, "mod_use_count_", -1, |
| ELFW(ST_INFO) (STB_LOCAL, STT_OBJECT), sec->idx, 0, |
| sizeof(long)); |
| |
| return 1; |
| } |
| |
| static int |
| old_init_module(const char *m_name, struct obj_file *f, |
| unsigned long m_size) |
| { |
| char *image; |
| struct old_mod_routines routines; |
| struct old_symbol_table *symtab; |
| int ret; |
| |
| /* Create the symbol table */ |
| { |
| int nsyms = 0, strsize = 0, total; |
| |
| /* Size things first... */ |
| if (flag_export) { |
| int i; |
| for (i = 0; i < HASH_BUCKETS; ++i) { |
| struct obj_symbol *sym; |
| for (sym = f->symtab[i]; sym; sym = sym->next) |
| if (ELFW(ST_BIND) (sym->info) != STB_LOCAL |
| && sym->secidx <= SHN_HIRESERVE) |
| { |
| sym->ksymidx = nsyms++; |
| strsize += strlen(sym->name) + 1; |
| } |
| } |
| } |
| |
| total = (sizeof(struct old_symbol_table) |
| + nsyms * sizeof(struct old_module_symbol) |
| + n_ext_modules_used * sizeof(struct old_module_ref) |
| + strsize); |
| symtab = xmalloc(total); |
| symtab->size = total; |
| symtab->n_symbols = nsyms; |
| symtab->n_refs = n_ext_modules_used; |
| |
| if (flag_export && nsyms) { |
| struct old_module_symbol *ksym; |
| char *str; |
| int i; |
| |
| ksym = symtab->symbol; |
| str = ((char *) ksym + nsyms * sizeof(struct old_module_symbol) |
| + n_ext_modules_used * sizeof(struct old_module_ref)); |
| |
| for (i = 0; i < HASH_BUCKETS; ++i) { |
| struct obj_symbol *sym; |
| for (sym = f->symtab[i]; sym; sym = sym->next) |
| if (sym->ksymidx >= 0) { |
| ksym->addr = obj_symbol_final_value(f, sym); |
| ksym->name = |
| (unsigned long) str - (unsigned long) symtab; |
| |
| strcpy(str, sym->name); |
| str += strlen(sym->name) + 1; |
| ksym++; |
| } |
| } |
| } |
| |
| if (n_ext_modules_used) { |
| struct old_module_ref *ref; |
| int i; |
| |
| ref = (struct old_module_ref *) |
| ((char *) symtab->symbol + nsyms * sizeof(struct old_module_symbol)); |
| |
| for (i = 0; i < n_ext_modules; ++i) |
| if (ext_modules[i].used) |
| ref++->module = ext_modules[i].addr; |
| } |
| } |
| |
| /* Fill in routines. */ |
| |
| routines.init = |
| obj_symbol_final_value(f, obj_find_symbol(f, "init_module")); |
| routines.cleanup = |
| obj_symbol_final_value(f, obj_find_symbol(f, "cleanup_module")); |
| |
| /* Whew! All of the initialization is complete. Collect the final |
| module image and give it to the kernel. */ |
| |
| image = xmalloc(m_size); |
| obj_create_image(f, image); |
| |
| /* image holds the complete relocated module, accounting correctly for |
| mod_use_count. However the old module kernel support assume that |
| it is receiving something which does not contain mod_use_count. */ |
| ret = old_sys_init_module(m_name, image + sizeof(long), |
| m_size | (flag_autoclean ? OLD_MOD_AUTOCLEAN |
| : 0), &routines, symtab); |
| if (ret) |
| perror_msg("init_module: %s", m_name); |
| |
| free(image); |
| free(symtab); |
| |
| return ret == 0; |
| } |
| |
| #else |
| |
| #define old_create_mod_use_count(x) TRUE |
| #define old_init_module(x, y, z) TRUE |
| |
| #endif /* BB_FEATURE_OLD_MODULE_INTERFACE */ |
| |
| |
| |
| /*======================================================================*/ |
| /* Functions relating to module loading after 2.1.18. */ |
| |
| static int |
| new_process_module_arguments(struct obj_file *f, int argc, char **argv) |
| { |
| while (argc > 0) { |
| char *p, *q, *key; |
| struct obj_symbol *sym; |
| char *contents, *loc; |
| int min, max, n; |
| |
| p = *argv; |
| if ((q = strchr(p, '=')) == NULL) { |
| argc--; |
| continue; |
| } |
| |
| key = alloca(q - p + 6); |
| memcpy(key, "parm_", 5); |
| memcpy(key + 5, p, q - p); |
| key[q - p + 5] = 0; |
| |
| p = get_modinfo_value(f, key); |
| key += 5; |
| if (p == NULL) { |
| error_msg("invalid parameter %s", key); |
| return 0; |
| } |
| |
| sym = obj_find_symbol(f, key); |
| |
| /* Also check that the parameter was not resolved from the kernel. */ |
| if (sym == NULL || sym->secidx > SHN_HIRESERVE) { |
| error_msg("symbol for parameter %s not found", key); |
| return 0; |
| } |
| |
| if (isdigit(*p)) { |
| min = strtoul(p, &p, 10); |
| if (*p == '-') |
| max = strtoul(p + 1, &p, 10); |
| else |
| max = min; |
| } else |
| min = max = 1; |
| |
| contents = f->sections[sym->secidx]->contents; |
| loc = contents + sym->value; |
| n = (*++q != '\0'); |
| |
| while (1) { |
| if ((*p == 's') || (*p == 'c')) { |
| char *str; |
| |
| /* Do C quoting if we begin with a ", else slurp the lot. */ |
| if (*q == '"') { |
| char *r; |
| |
| str = alloca(strlen(q)); |
| for (r = str, q++; *q != '"'; ++q, ++r) { |
| if (*q == '\0') { |
| error_msg("improperly terminated string argument for %s", |
| key); |
| return 0; |
| } else if (*q == '\\') |
| switch (*++q) { |
| case 'a': |
| *r = '\a'; |
| break; |
| case 'b': |
| *r = '\b'; |
| break; |
| case 'e': |
| *r = '\033'; |
| break; |
| case 'f': |
| *r = '\f'; |
| break; |
| case 'n': |
| *r = '\n'; |
| break; |
| case 'r': |
| *r = '\r'; |
| break; |
| case 't': |
| *r = '\t'; |
| break; |
| |
| case '0': |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| { |
| int c = *q - '0'; |
| if (q[1] >= '0' && q[1] <= '7') { |
| c = (c * 8) + *++q - '0'; |
| if (q[1] >= '0' && q[1] <= '7') |
| c = (c * 8) + *++q - '0'; |
| } |
| *r = c; |
| } |
| break; |
| |
| default: |
| *r = *q; |
| break; |
| } else |
| *r = *q; |
| } |
| *r = '\0'; |
| ++q; |
| } else { |
| char *r; |
| |
| /* In this case, the string is not quoted. We will break |
| it using the coma (like for ints). If the user wants to |
| include comas in a string, he just has to quote it */ |
| |
| /* Search the next coma */ |
| r = strchr(q, ','); |
| |
| /* Found ? */ |
| if (r != (char *) NULL) { |
| /* Recopy the current field */ |
| str = alloca(r - q + 1); |
| memcpy(str, q, r - q); |
| |
| /* I don't know if it is usefull, as the previous case |
| doesn't null terminate the string ??? */ |
| str[r - q] = '\0'; |
| |
| /* Keep next fields */ |
| q = r; |
| } else { |
| /* last string */ |
| str = q; |
| q = ""; |
| } |
| } |
| |
| if (*p == 's') { |
| /* Normal string */ |
| obj_string_patch(f, sym->secidx, loc - contents, str); |
| loc += tgt_sizeof_char_p; |
| } else { |
| /* Array of chars (in fact, matrix !) */ |
| unsigned long charssize; /* size of each member */ |
| |
| /* Get the size of each member */ |
| /* Probably we should do that outside the loop ? */ |
| if (!isdigit(*(p + 1))) { |
| error_msg("parameter type 'c' for %s must be followed by" |
| " the maximum size", key); |
| return 0; |
| } |
| charssize = strtoul(p + 1, (char **) NULL, 10); |
| |
| /* Check length */ |
| if (strlen(str) >= charssize) { |
| error_msg("string too long for %s (max %ld)", key, |
| charssize - 1); |
| return 0; |
| } |
| |
| /* Copy to location */ |
| strcpy((char *) loc, str); |
| loc += charssize; |
| } |
| } else { |
| long v = strtoul(q, &q, 0); |
| switch (*p) { |
| case 'b': |
| *loc++ = v; |
| break; |
| case 'h': |
| *(short *) loc = v; |
| loc += tgt_sizeof_short; |
| break; |
| case 'i': |
| *(int *) loc = v; |
| loc += tgt_sizeof_int; |
| break; |
| case 'l': |
| *(long *) loc = v; |
| loc += tgt_sizeof_long; |
| break; |
| |
| default: |
| error_msg("unknown parameter type '%c' for %s", *p, key); |
| return 0; |
| } |
| } |
| |
| retry_end_of_value: |
| switch (*q) { |
| case '\0': |
| goto end_of_arg; |
| |
| case ' ': |
| case '\t': |
| case '\n': |
| case '\r': |
| ++q; |
| goto retry_end_of_value; |
| |
| case ',': |
| if (++n > max) { |
| error_msg("too many values for %s (max %d)", key, max); |
| return 0; |
| } |
| ++q; |
| break; |
| |
| default: |
| error_msg("invalid argument syntax for %s", key); |
| return 0; |
| } |
| } |
| |
| end_of_arg: |
| if (n < min) { |
| error_msg("too few values for %s (min %d)", key, min); |
| return 0; |
| } |
| |
| argc--, argv++; |
| } |
| |
| return 1; |
| } |
| |
| #ifdef BB_FEATURE_INSMOD_VERSION_CHECKING |
| static int new_is_module_checksummed(struct obj_file *f) |
| { |
| const char *p = get_modinfo_value(f, "using_checksums"); |
| if (p) |
| return atoi(p); |
| else |
| return 0; |
| } |
| |
| /* Get the module's kernel version in the canonical integer form. */ |
| |
| static int |
| new_get_module_version(struct obj_file *f, char str[STRVERSIONLEN]) |
| { |
| char *p, *q; |
| int a, b, c; |
| |
| p = get_modinfo_value(f, "kernel_version"); |
| if (p == NULL) |
| return -1; |
| strncpy(str, p, STRVERSIONLEN); |
| |
| a = strtoul(p, &p, 10); |
| if (*p != '.') |
| return -1; |
| b = strtoul(p + 1, &p, 10); |
| if (*p != '.') |
| return -1; |
| c = strtoul(p + 1, &q, 10); |
| if (p + 1 == q) |
| return -1; |
| |
| return a << 16 | b << 8 | c; |
| } |
| |
| #endif /* BB_FEATURE_INSMOD_VERSION_CHECKING */ |
| |
| |
| #ifdef BB_FEATURE_NEW_MODULE_INTERFACE |
| |
| /* Fetch the loaded modules, and all currently exported symbols. */ |
| |
| static int new_get_kernel_symbols(void) |
| { |
| char *module_names, *mn; |
| struct external_module *modules, *m; |
| struct new_module_symbol *syms, *s; |
| size_t ret, bufsize, nmod, nsyms, i, j; |
| |
| /* Collect the loaded modules. */ |
| |
| module_names = xmalloc(bufsize = 256); |
| retry_modules_load: |
| if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) { |
| if (errno == ENOSPC) { |
| module_names = xrealloc(module_names, bufsize = ret); |
| goto retry_modules_load; |
| } |
| perror_msg("QM_MODULES"); |
| return 0; |
| } |
| |
| n_ext_modules = nmod = ret; |
| |
| /* Collect the modules' symbols. */ |
| |
| if (nmod){ |
| ext_modules = modules = xmalloc(nmod * sizeof(*modules)); |
| memset(modules, 0, nmod * sizeof(*modules)); |
| for (i = 0, mn = module_names, m = modules; |
| i < nmod; ++i, ++m, mn += strlen(mn) + 1) { |
| struct new_module_info info; |
| |
| if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) { |
| if (errno == ENOENT) { |
| /* The module was removed out from underneath us. */ |
| continue; |
| } |
| perror_msg("query_module: QM_INFO: %s", mn); |
| return 0; |
| } |
| |
| syms = xmalloc(bufsize = 1024); |
| retry_mod_sym_load: |
| if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) { |
| switch (errno) { |
| case ENOSPC: |
| syms = xrealloc(syms, bufsize = ret); |
| goto retry_mod_sym_load; |
| case ENOENT: |
| /* The module was removed out from underneath us. */ |
| continue; |
| default: |
| perror_msg("query_module: QM_SYMBOLS: %s", mn); |
| return 0; |
| } |
| } |
| nsyms = ret; |
| |
| m->name = mn; |
| m->addr = info.addr; |
| m->nsyms = nsyms; |
| m->syms = syms; |
| |
| for (j = 0, s = syms; j < nsyms; ++j, ++s) { |
| s->name += (unsigned long) syms; |
| } |
| } |
| } |
| |
| /* Collect the kernel's symbols. */ |
| |
| syms = xmalloc(bufsize = 16 * 1024); |
| retry_kern_sym_load: |
| if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) { |
| if (errno == ENOSPC) { |
| syms = xrealloc(syms, bufsize = ret); |
| goto retry_kern_sym_load; |
| } |
| perror_msg("kernel: QM_SYMBOLS"); |
| return 0; |
| } |
| nksyms = nsyms = ret; |
| ksyms = syms; |
| |
| for (j = 0, s = syms; j < nsyms; ++j, ++s) { |
| s->name += (unsigned long) syms; |
| } |
| return 1; |
| } |
| |
| |
| /* Return the kernel symbol checksum version, or zero if not used. */ |
| |
| static int new_is_kernel_checksummed(void) |
| { |
| struct new_module_symbol *s; |
| size_t i; |
| |
| /* Using_Versions is not the first symbol, but it should be in there. */ |
| |
| for (i = 0, s = ksyms; i < nksyms; ++i, ++s) |
| if (strcmp((char *) s->name, "Using_Versions") == 0) |
| return s->value; |
| |
| return 0; |
| } |
| |
| |
| static int new_create_this_module(struct obj_file *f, const char *m_name) |
| { |
| struct obj_section *sec; |
| |
| sec = obj_create_alloced_section_first(f, ".this", tgt_sizeof_long, |
| sizeof(struct new_module)); |
| memset(sec->contents, 0, sizeof(struct new_module)); |
| |
| obj_add_symbol(f, "__this_module", -1, |
| ELFW(ST_INFO) (STB_LOCAL, STT_OBJECT), sec->idx, 0, |
| sizeof(struct new_module)); |
| |
| obj_string_patch(f, sec->idx, offsetof(struct new_module, name), |
| m_name); |
| |
| return 1; |
| } |
| |
| |
| static int new_create_module_ksymtab(struct obj_file *f) |
| { |
| struct obj_section *sec; |
| int i; |
| |
| /* We must always add the module references. */ |
| |
| if (n_ext_modules_used) { |
| struct new_module_ref *dep; |
| struct obj_symbol *tm; |
| |
| sec = obj_create_alloced_section(f, ".kmodtab", tgt_sizeof_void_p, |
| (sizeof(struct new_module_ref) |
| * n_ext_modules_used)); |
| if (!sec) |
| return 0; |
| |
| tm = obj_find_symbol(f, "__this_module"); |
| dep = (struct new_module_ref *) sec->contents; |
| for (i = 0; i < n_ext_modules; ++i) |
| if (ext_modules[i].used) { |
| dep->dep = ext_modules[i].addr; |
| obj_symbol_patch(f, sec->idx, |
| (char *) &dep->ref - sec->contents, tm); |
| dep->next_ref = 0; |
| ++dep; |
| } |
| } |
| |
| if (flag_export && !obj_find_section(f, "__ksymtab")) { |
| size_t nsyms; |
| int *loaded; |
| |
| sec = |
| obj_create_alloced_section(f, "__ksymtab", tgt_sizeof_void_p, |
| 0); |
| |
| /* We don't want to export symbols residing in sections that |
| aren't loaded. There are a number of these created so that |
| we make sure certain module options don't appear twice. */ |
| |
| loaded = alloca(sizeof(int) * (i = f->header.e_shnum)); |
| while (--i >= 0) |
| loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0; |
| |
| for (nsyms = i = 0; i < HASH_BUCKETS; ++i) { |
| struct obj_symbol *sym; |
| for (sym = f->symtab[i]; sym; sym = sym->next) |
| if (ELFW(ST_BIND) (sym->info) != STB_LOCAL |
| && sym->secidx <= SHN_HIRESERVE |
| && (sym->secidx >= SHN_LORESERVE |
| || loaded[sym->secidx])) { |
| ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p; |
| |
| obj_symbol_patch(f, sec->idx, ofs, sym); |
| obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p, |
| sym->name); |
| |
| nsyms++; |
| } |
| } |
| |
| obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p); |
| } |
| |
| return 1; |
| } |
| |
| |
| static int |
| new_init_module(const char *m_name, struct obj_file *f, |
| unsigned long m_size) |
| { |
| struct new_module *module; |
| struct obj_section *sec; |
| void *image; |
| int ret; |
| tgt_long m_addr; |
| |
| sec = obj_find_section(f, ".this"); |
| module = (struct new_module *) sec->contents; |
| m_addr = sec->header.sh_addr; |
| |
| module->size_of_struct = sizeof(*module); |
| module->size = m_size; |
| module->flags = flag_autoclean ? NEW_MOD_AUTOCLEAN : 0; |
| |
| sec = obj_find_section(f, "__ksymtab"); |
| if (sec && sec->header.sh_size) { |
| module->syms = sec->header.sh_addr; |
| module->nsyms = sec->header.sh_size / (2 * tgt_sizeof_char_p); |
| } |
| |
| if (n_ext_modules_used) { |
| sec = obj_find_section(f, ".kmodtab"); |
| module->deps = sec->header.sh_addr; |
| module->ndeps = n_ext_modules_used; |
| } |
| |
| module->init = |
| obj_symbol_final_value(f, obj_find_symbol(f, "init_module")); |
| module->cleanup = |
| obj_symbol_final_value(f, obj_find_symbol(f, "cleanup_module")); |
| |
| sec = obj_find_section(f, "__ex_table"); |
| if (sec) { |
| module->ex_table_start = sec->header.sh_addr; |
| module->ex_table_end = sec->header.sh_addr + sec->header.sh_size; |
| } |
| |
| sec = obj_find_section(f, ".text.init"); |
| if (sec) { |
| module->runsize = sec->header.sh_addr - m_addr; |
| } |
| sec = obj_find_section(f, ".data.init"); |
| if (sec) { |
| if (!module->runsize || |
| module->runsize > sec->header.sh_addr - m_addr) |
| module->runsize = sec->header.sh_addr - m_addr; |
| } |
| |
| if (!arch_init_module(f, module)) |
| return 0; |
| |
| /* Whew! All of the initialization is complete. Collect the final |
| module image and give it to the kernel. */ |
| |
| image = xmalloc(m_size); |
| obj_create_image(f, image); |
| |
| ret = new_sys_init_module(m_name, (struct new_module *) image); |
| if (ret) |
| perror_msg("init_module: %s", m_name); |
| |
| free(image); |
| |
| return ret == 0; |
| } |
| |
| #else |
| |
| #define new_init_module(x, y, z) TRUE |
| #define new_create_this_module(x, y) 0 |
| #define new_create_module_ksymtab(x) |
| #define query_module(v, w, x, y, z) -1 |
| |
| #endif /* BB_FEATURE_NEW_MODULE_INTERFACE */ |
| |
| |
| /*======================================================================*/ |
| |
| int |
| obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, |
| const char *string) |
| { |
| struct obj_string_patch *p; |
| struct obj_section *strsec; |
| size_t len = strlen(string) + 1; |
| char *loc; |
| |
| p = xmalloc(sizeof(*p)); |
| p->next = f->string_patches; |
| p->reloc_secidx = secidx; |
| p->reloc_offset = offset; |
| f->string_patches = p; |
| |
| strsec = obj_find_section(f, ".kstrtab"); |
| if (strsec == NULL) { |
| strsec = obj_create_alloced_section(f, ".kstrtab", 1, len); |
| p->string_offset = 0; |
| loc = strsec->contents; |
| } else { |
| p->string_offset = strsec->header.sh_size; |
| loc = obj_extend_section(strsec, len); |
| } |
| memcpy(loc, string, len); |
| |
| return 1; |
| } |
| |
| int |
| obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, |
| struct obj_symbol *sym) |
| { |
| struct obj_symbol_patch *p; |
| |
| p = xmalloc(sizeof(*p)); |
| p->next = f->symbol_patches; |
| p->reloc_secidx = secidx; |
| p->reloc_offset = offset; |
| p->sym = sym; |
| f->symbol_patches = p; |
| |
| return 1; |
| } |
| |
| int obj_check_undefineds(struct obj_file *f) |
| { |
| unsigned long i; |
| int ret = 1; |
| |
| for (i = 0; i < HASH_BUCKETS; ++i) { |
| struct obj_symbol *sym; |
| for (sym = f->symtab[i]; sym; sym = sym->next) |
| if (sym->secidx == SHN_UNDEF) { |
| if (ELFW(ST_BIND) (sym->info) == STB_WEAK) { |
| sym->secidx = SHN_ABS; |
| sym->value = 0; |
| } else { |
| error_msg("unresolved symbol %s", sym->name); |
| ret = 0; |
| } |
| } |
| } |
| |
| return ret; |
| } |
| |
| void obj_allocate_commons(struct obj_file *f) |
| { |
| struct common_entry { |
| struct common_entry *next; |
| struct obj_symbol *sym; |
| } *common_head = NULL; |
| |
| unsigned long i; |
| |
| for (i = 0; i < HASH_BUCKETS; ++i) { |
| struct obj_symbol *sym; |
| for (sym = f->symtab[i]; sym; sym = sym->next) |
| if (sym->secidx == SHN_COMMON) { |
| /* Collect all COMMON symbols and sort them by size so as to |
| minimize space wasted by alignment requirements. */ |
| { |
| struct common_entry **p, *n; |
| for (p = &common_head; *p; p = &(*p)->next) |
| if (sym->size <= (*p)->sym->size) |
| break; |
| |
| n = alloca(sizeof(*n)); |
| n->next = *p; |
| n->sym = sym; |
| *p = n; |
| } |
| } |
| } |
| |
| for (i = 1; i < f->local_symtab_size; ++i) { |
| struct obj_symbol *sym = f->local_symtab[i]; |
| if (sym && sym->secidx == SHN_COMMON) { |
| struct common_entry **p, *n; |
| for (p = &common_head; *p; p = &(*p)->next) |
| if (sym == (*p)->sym) |
| break; |
| else if (sym->size < (*p)->sym->size) { |
| n = alloca(sizeof(*n)); |
| n->next = *p; |
| n->sym = sym; |
| *p = n; |
| break; |
| } |
| } |
| } |
| |
| if (common_head) { |
| /* Find the bss section. */ |
| for (i = 0; i < f->header.e_shnum; ++i) |
| if (f->sections[i]->header.sh_type == SHT_NOBITS) |
| break; |
| |
| /* If for some reason there hadn't been one, create one. */ |
| if (i == f->header.e_shnum) { |
| struct obj_section *sec; |
| |
| f->sections = xrealloc(f->sections, (i + 1) * sizeof(sec)); |
| f->sections[i] = sec = arch_new_section(); |
| f->header.e_shnum = i + 1; |
| |
| memset(sec, 0, sizeof(*sec)); |
| sec->header.sh_type = SHT_PROGBITS; |
| sec->header.sh_flags = SHF_WRITE | SHF_ALLOC; |
| sec->name = ".bss"; |
| sec->idx = i; |
| } |
| |
| /* Allocate the COMMONS. */ |
| { |
| ElfW(Addr) bss_size = f->sections[i]->header.sh_size; |
| ElfW(Addr) max_align = f->sections[i]->header.sh_addralign; |
| struct common_entry *c; |
| |
| for (c = common_head; c; c = c->next) { |
| ElfW(Addr) align = c->sym->value; |
| |
| if (align > max_align) |
| max_align = align; |
| if (bss_size & (align - 1)) |
| bss_size = (bss_size | (align - 1)) + 1; |
| |
| c->sym->secidx = i; |
| c->sym->value = bss_size; |
| |
| bss_size += c->sym->size; |
| } |
| |
| f->sections[i]->header.sh_size = bss_size; |
| f->sections[i]->header.sh_addralign = max_align; |
| } |
| } |
| |
| /* For the sake of patch relocation and parameter initialization, |
| allocate zeroed data for NOBITS sections now. Note that after |
| this we cannot assume NOBITS are really empty. */ |
| for (i = 0; i < f->header.e_shnum; ++i) { |
| struct obj_section *s = f->sections[i]; |
| if (s->header.sh_type == SHT_NOBITS) { |
| if (s->header.sh_size != 0) |
| s->contents = memset(xmalloc(s->header.sh_size), |
| 0, s->header.sh_size); |
| else |
| s->contents = NULL; |
| |
| s->header.sh_type = SHT_PROGBITS; |
| } |
| } |
| } |
| |
| unsigned long obj_load_size(struct obj_file *f) |
| { |
| unsigned long dot = 0; |
| struct obj_section *sec; |
| |
| /* Finalize the positions of the sections relative to one another. */ |
| |
| for (sec = f->load_order; sec; sec = sec->load_next) { |
| ElfW(Addr) align; |
| |
| align = sec->header.sh_addralign; |
| if (align && (dot & (align - 1))) |
| dot = (dot | (align - 1)) + 1; |
| |
| sec->header.sh_addr = dot; |
| dot += sec->header.sh_size; |
| } |
| |
| return dot; |
| } |
| |
| int obj_relocate(struct obj_file *f, ElfW(Addr) base) |
| { |
| int i, n = f->header.e_shnum; |
| int ret = 1; |
| |
| /* Finalize the addresses of the sections. */ |
| |
| f->baseaddr = base; |
| for (i = 0; i < n; ++i) |
| f->sections[i]->header.sh_addr += base; |
| |
| /* And iterate over all of the relocations. */ |
| |
| for (i = 0; i < n; ++i) { |
| struct obj_section *relsec, *symsec, *targsec, *strsec; |
| ElfW(RelM) * rel, *relend; |
| ElfW(Sym) * symtab; |
| const char *strtab; |
| |
| relsec = f->sections[i]; |
| if (relsec->header.sh_type != SHT_RELM) |
| continue; |
| |
| symsec = f->sections[relsec->header.sh_link]; |
| targsec = f->sections[relsec->header.sh_info]; |
| strsec = f->sections[symsec->header.sh_link]; |
| |
| rel = (ElfW(RelM) *) relsec->contents; |
| relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM))); |
| symtab = (ElfW(Sym) *) symsec->contents; |
| strtab = (const char *) strsec->contents; |
| |
| for (; rel < relend; ++rel) { |
| ElfW(Addr) value = 0; |
| struct obj_symbol *intsym = NULL; |
| unsigned long symndx; |
| ElfW(Sym) * extsym = 0; |
| const char *errmsg; |
| |
| /* Attempt to find a value to use for this relocation. */ |
| |
| symndx = ELFW(R_SYM) (rel->r_info); |
| if (symndx) { |
| /* Note we've already checked for undefined symbols. */ |
| |
| extsym = &symtab[symndx]; |
| if (ELFW(ST_BIND) (extsym->st_info) == STB_LOCAL) { |
| /* Local symbols we look up in the local table to be sure |
| we get the one that is really intended. */ |
| intsym = f->local_symtab[symndx]; |
| } else { |
| /* Others we look up in the hash table. */ |
| const char *name; |
| if (extsym->st_name) |
| name = strtab + extsym->st_name; |
| else |
| name = f->sections[extsym->st_shndx]->name; |
| intsym = obj_find_symbol(f, name); |
| } |
| |
| value = obj_symbol_final_value(f, intsym); |
| intsym->referenced = 1; |
| } |
| #if SHT_RELM == SHT_RELA |
| #if defined(__alpha__) && defined(AXP_BROKEN_GAS) |
| /* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */ |
| if (!extsym || !extsym->st_name || |
| ELFW(ST_BIND) (extsym->st_info) != STB_LOCAL) |
| #endif |
| value += rel->r_addend; |
| #endif |
| |
| /* Do it! */ |
| switch (arch_apply_relocation |
| (f, targsec, symsec, intsym, rel, value)) { |
| case obj_reloc_ok: |
| break; |
| |
| case obj_reloc_overflow: |
| errmsg = "Relocation overflow"; |
| goto bad_reloc; |
| case obj_reloc_dangerous: |
| errmsg = "Dangerous relocation"; |
| goto bad_reloc; |
| case obj_reloc_unhandled: |
| errmsg = "Unhandled relocation"; |
| bad_reloc: |
| if (extsym) { |
| error_msg("%s of type %ld for %s", errmsg, |
| (long) ELFW(R_TYPE) (rel->r_info), |
| strtab + extsym->st_name); |
| } else { |
| error_msg("%s of type %ld", errmsg, |
| (long) ELFW(R_TYPE) (rel->r_info)); |
| } |
| ret = 0; |
| break; |
| } |
| } |
| } |
| |
| /* Finally, take care of the patches. */ |
| |
| if (f->string_patches) { |
| struct obj_string_patch *p; |
| struct obj_section *strsec; |
| ElfW(Addr) strsec_base; |
| strsec = obj_find_section(f, ".kstrtab"); |
| strsec_base = strsec->header.sh_addr; |
| |
| for (p = f->string_patches; p; p = p->next) { |
| struct obj_section *targsec = f->sections[p->reloc_secidx]; |
| *(ElfW(Addr) *) (targsec->contents + p->reloc_offset) |
| = strsec_base + p->string_offset; |
| } |
| } |
| |
| if (f->symbol_patches) { |
| struct obj_symbol_patch *p; |
| |
| for (p = f->symbol_patches; p; p = p->next) { |
| struct obj_section *targsec = f->sections[p->reloc_secidx]; |
| *(ElfW(Addr) *) (targsec->contents + p->reloc_offset) |
| = obj_symbol_final_value(f, p->sym); |
| } |
| } |
| |
| return ret; |
| } |
| |
| int obj_create_image(struct obj_file *f, char *image) |
| { |
| struct obj_section *sec; |
| ElfW(Addr) base = f->baseaddr; |
| |
| for (sec = f->load_order; sec; sec = sec->load_next) { |
| char *secimg; |
| |
| if (sec->contents == 0 || sec->header.sh_size == 0) |
| continue; |
| |
| secimg = image + (sec->header.sh_addr - base); |
| |
| /* Note that we allocated data for NOBITS sections earlier. */ |
| memcpy(secimg, sec->contents, sec->header.sh_size); |
| } |
| |
| return 1; |
| } |
| |
| /*======================================================================*/ |
| |
| struct obj_file *obj_load(FILE * fp) |
| { |
| struct obj_file *f; |
| ElfW(Shdr) * section_headers; |
| int shnum, i; |
| char *shstrtab; |
| |
| /* Read the file header. */ |
| |
| f = arch_new_file(); |
| memset(f, 0, sizeof(*f)); |
| f->symbol_cmp = strcmp; |
| f->symbol_hash = obj_elf_hash; |
| f->load_order_search_start = &f->load_order; |
| |
| fseek(fp, 0, SEEK_SET); |
| if (fread(&f->header, sizeof(f->header), 1, fp) != 1) { |
| perror_msg("error reading ELF header"); |
| return NULL; |
| } |
| |
| if (f->header.e_ident[EI_MAG0] != ELFMAG0 |
| || f->header.e_ident[EI_MAG1] != ELFMAG1 |
| || f->header.e_ident[EI_MAG2] != ELFMAG2 |
| || f->header.e_ident[EI_MAG3] != ELFMAG3) { |
| error_msg("not an ELF file"); |
| return NULL; |
| } |
| if (f->header.e_ident[EI_CLASS] != ELFCLASSM |
| || f->header.e_ident[EI_DATA] != ELFDATAM |
| || f->header.e_ident[EI_VERSION] != EV_CURRENT |
| || !MATCH_MACHINE(f->header.e_machine)) { |
| error_msg("ELF file not for this architecture"); |
| return NULL; |
| } |
| if (f->header.e_type != ET_REL) { |
| error_msg("ELF file not a relocatable object"); |
| return NULL; |
| } |
| |
| /* Read the section headers. */ |
| |
| if (f->header.e_shentsize != sizeof(ElfW(Shdr))) { |
| error_msg("section header size mismatch: %lu != %lu", |
| (unsigned long) f->header.e_shentsize, |
| (unsigned long) sizeof(ElfW(Shdr))); |
| return NULL; |
| } |
| |
| shnum = f->header.e_shnum; |
| f->sections = xmalloc(sizeof(struct obj_section *) * shnum); |
| memset(f->sections, 0, sizeof(struct obj_section *) * shnum); |
| |
| section_headers = alloca(sizeof(ElfW(Shdr)) * shnum); |
| fseek(fp, f->header.e_shoff, SEEK_SET); |
| if (fread(section_headers, sizeof(ElfW(Shdr)), shnum, fp) != shnum) { |
| perror_msg("error reading ELF section headers"); |
| return NULL; |
| } |
| |
| /* Read the section data. */ |
| |
| for (i = 0; i < shnum; ++i) { |
| struct obj_section *sec; |
| |
| f->sections[i] = sec = arch_new_section(); |
| memset(sec, 0, sizeof(*sec)); |
| |
| sec->header = section_headers[i]; |
| sec->idx = i; |
| |
| if(sec->header.sh_size) switch (sec->header.sh_type) { |
| case SHT_NULL: |
| case SHT_NOTE: |
| case SHT_NOBITS: |
| /* ignore */ |
| break; |
| |
| case SHT_PROGBITS: |
| case SHT_SYMTAB: |
| case SHT_STRTAB: |
| case SHT_RELM: |
| if (sec->header.sh_size > 0) { |
| sec->contents = xmalloc(sec->header.sh_size); |
| fseek(fp, sec->header.sh_offset, SEEK_SET); |
| if (fread(sec->contents, sec->header.sh_size, 1, fp) != 1) { |
| perror_msg("error reading ELF section data"); |
| return NULL; |
| } |
| } else { |
| sec->contents = NULL; |
| } |
| break; |
| |
| #if SHT_RELM == SHT_REL |
| case SHT_RELA: |
| error_msg("RELA relocations not supported on this architecture"); |
| return NULL; |
| #else |
| case SHT_REL: |
| error_msg("REL relocations not supported on this architecture"); |
| return NULL; |
| #endif |
| |
| default: |
| if (sec->header.sh_type >= SHT_LOPROC) { |
| /* Assume processor specific section types are debug |
| info and can safely be ignored. If this is ever not |
| the case (Hello MIPS?), don't put ifdefs here but |
| create an arch_load_proc_section(). */ |
| break; |
| } |
| |
| error_msg("can't handle sections of type %ld", |
| (long) sec->header.sh_type); |
| return NULL; |
| } |
| } |
| |
| /* Do what sort of interpretation as needed by each section. */ |
| |
| shstrtab = f->sections[f->header.e_shstrndx]->contents; |
| |
| for (i = 0; i < shnum; ++i) { |
| struct obj_section *sec = f->sections[i]; |
| sec->name = shstrtab + sec->header.sh_name; |
| } |
| |
| for (i = 0; i < shnum; ++i) { |
| struct obj_section *sec = f->sections[i]; |
| |
| if (sec->header.sh_flags & SHF_ALLOC) |
| obj_insert_section_load_order(f, sec); |
| |
| switch (sec->header.sh_type) { |
| case SHT_SYMTAB: |
| { |
| unsigned long nsym, j; |
| char *strtab; |
| ElfW(Sym) * sym; |
| |
| if (sec->header.sh_entsize != sizeof(ElfW(Sym))) { |
| error_msg("symbol size mismatch: %lu != %lu", |
| (unsigned long) sec->header.sh_entsize, |
| (unsigned long) sizeof(ElfW(Sym))); |
| return NULL; |
| } |
| |
| nsym = sec->header.sh_size / sizeof(ElfW(Sym)); |
| strtab = f->sections[sec->header.sh_link]->contents; |
| sym = (ElfW(Sym) *) sec->contents; |
| |
| /* Allocate space for a table of local symbols. */ |
| j = f->local_symtab_size = sec->header.sh_info; |
| f->local_symtab = xmalloc(j *= |
| sizeof(struct obj_symbol *)); |
| memset(f->local_symtab, 0, j); |
| |
| /* Insert all symbols into the hash table. */ |
| for (j = 1, ++sym; j < nsym; |