2f79e48ae2
This adds fs/compat_binfmt_elf.c, a wrapper around fs/binfmt_elf.c for 32-bit ELF support on 64-bit kernels. It can replace all the hand-rolled versions of this that each 32/64 arch has, which are all about the same. To use this, an arch's asm/elf.h has to define at least a few compat_* macros that parallel the various macros that fs/binfmt_elf.c uses for native support. There is no attempt to deal with compat macros for the core dump format support. To use this file, the arch has to define compat_gregset_t for linux/elfcore-compat.h and #define CORE_DUMP_USE_REGSET. The 32-bit compatible formats should come automatically from task_user_regset_view called on a 32-bit task. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
|
|
* 32-bit compatibility support for ELF format executables and core dumps.
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License v.2.
|
|
*
|
|
* Red Hat Author: Roland McGrath.
|
|
*
|
|
* This file is used in a 64-bit kernel that wants to support 32-bit ELF.
|
|
* asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
|
|
* used below, with definitions appropriate for 32-bit ABI compatibility.
|
|
*
|
|
* We use macros to rename the ABI types and machine-dependent
|
|
* functions used in binfmt_elf.c to compat versions.
|
|
*/
|
|
|
|
#include <linux/elfcore-compat.h>
|
|
#include <linux/time.h>
|
|
|
|
/*
|
|
* Rename the basic ELF layout types to refer to the 32-bit class of files.
|
|
*/
|
|
#undef ELF_CLASS
|
|
#define ELF_CLASS ELFCLASS32
|
|
|
|
#undef elfhdr
|
|
#undef elf_phdr
|
|
#undef elf_note
|
|
#undef elf_addr_t
|
|
#define elfhdr elf32_hdr
|
|
#define elf_phdr elf32_phdr
|
|
#define elf_note elf32_note
|
|
#define elf_addr_t Elf32_Addr
|
|
|
|
/*
|
|
* The machine-dependent core note format types are defined in elfcore-compat.h,
|
|
* which requires asm/elf.h to define compat_elf_gregset_t et al.
|
|
*/
|
|
#define elf_prstatus compat_elf_prstatus
|
|
#define elf_prpsinfo compat_elf_prpsinfo
|
|
|
|
/*
|
|
* Compat version of cputime_to_compat_timeval, perhaps this
|
|
* should be an inline in <linux/compat.h>.
|
|
*/
|
|
static void cputime_to_compat_timeval(const cputime_t cputime,
|
|
struct compat_timeval *value)
|
|
{
|
|
struct timeval tv;
|
|
cputime_to_timeval(cputime, &tv);
|
|
value->tv_sec = tv.tv_sec;
|
|
value->tv_usec = tv.tv_usec;
|
|
}
|
|
|
|
#undef cputime_to_timeval
|
|
#define cputime_to_timeval cputime_to_compat_timeval
|
|
|
|
|
|
/*
|
|
* To use this file, asm/elf.h must define compat_elf_check_arch.
|
|
* The other following macros can be defined if the compat versions
|
|
* differ from the native ones, or omitted when they match.
|
|
*/
|
|
|
|
#undef ELF_ARCH
|
|
#undef elf_check_arch
|
|
#define elf_check_arch compat_elf_check_arch
|
|
|
|
#ifdef COMPAT_ELF_PLATFORM
|
|
#undef ELF_PLATFORM
|
|
#define ELF_PLATFORM COMPAT_ELF_PLATFORM
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_HWCAP
|
|
#undef ELF_HWCAP
|
|
#define ELF_HWCAP COMPAT_ELF_HWCAP
|
|
#endif
|
|
|
|
#ifdef COMPAT_ARCH_DLINFO
|
|
#undef ARCH_DLINFO
|
|
#define ARCH_DLINFO COMPAT_ARCH_DLINFO
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_ET_DYN_BASE
|
|
#undef ELF_ET_DYN_BASE
|
|
#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_EXEC_PAGESIZE
|
|
#undef ELF_EXEC_PAGESIZE
|
|
#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_PLAT_INIT
|
|
#undef ELF_PLAT_INIT
|
|
#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
|
|
#endif
|
|
|
|
#ifdef COMPAT_SET_PERSONALITY
|
|
#undef SET_PERSONALITY
|
|
#define SET_PERSONALITY COMPAT_SET_PERSONALITY
|
|
#endif
|
|
|
|
#ifdef compat_start_thread
|
|
#undef start_thread
|
|
#define start_thread compat_start_thread
|
|
#endif
|
|
|
|
#ifdef compat_arch_setup_additional_pages
|
|
#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
|
|
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
|
|
#undef arch_setup_additional_pages
|
|
#define arch_setup_additional_pages compat_arch_setup_additional_pages
|
|
#endif
|
|
|
|
/*
|
|
* Rename a few of the symbols that binfmt_elf.c will define.
|
|
* These are all local so the names don't really matter, but it
|
|
* might make some debugging less confusing not to duplicate them.
|
|
*/
|
|
#define elf_format compat_elf_format
|
|
#define init_elf_binfmt init_compat_elf_binfmt
|
|
#define exit_elf_binfmt exit_compat_elf_binfmt
|
|
|
|
/*
|
|
* We share all the actual code with the native (64-bit) version.
|
|
*/
|
|
#include "binfmt_elf.c"
|