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9afc5eee65
Christoph Hellwig suggested a slightly different path for handling backwards compatibility with the 32-bit time_t based system calls: Rather than simply reusing the compat_sys_* entry points on 32-bit architectures unchanged, we get rid of those entry points and the compat_time types by renaming them to something that makes more sense on 32-bit architectures (which don't have a compat mode otherwise), and then share the entry points under the new name with the 64-bit architectures that use them for implementing the compatibility. The following types and interfaces are renamed here, and moved from linux/compat_time.h to linux/time32.h: old new --- --- compat_time_t old_time32_t struct compat_timeval struct old_timeval32 struct compat_timespec struct old_timespec32 struct compat_itimerspec struct old_itimerspec32 ns_to_compat_timeval() ns_to_old_timeval32() get_compat_itimerspec64() get_old_itimerspec32() put_compat_itimerspec64() put_old_itimerspec32() compat_get_timespec64() get_old_timespec32() compat_put_timespec64() put_old_timespec32() As we already have aliases in place, this patch addresses only the instances that are relevant to the system call interface in particular, not those that occur in device drivers and other modules. Those will get handled separately, while providing the 64-bit version of the respective interfaces. I'm not renaming the timex, rusage and itimerval structures, as we are still debating what the new interface will look like, and whether we will need a replacement at all. This also doesn't change the names of the syscall entry points, which can be done more easily when we actually switch over the 32-bit architectures to use them, at that point we need to change COMPAT_SYSCALL_DEFINEx to SYSCALL_DEFINEx with a new name, e.g. with a _time32 suffix. Suggested-by: Christoph Hellwig <hch@infradead.org> Link: https://lore.kernel.org/lkml/20180705222110.GA5698@infradead.org/ Signed-off-by: Arnd Bergmann <arnd@arndb.de>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* 32-bit compatibility support for ELF format executables and core dumps.
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*
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* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* Red Hat Author: Roland McGrath.
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*
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* This file is used in a 64-bit kernel that wants to support 32-bit ELF.
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* asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
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* used below, with definitions appropriate for 32-bit ABI compatibility.
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*
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* We use macros to rename the ABI types and machine-dependent
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* functions used in binfmt_elf.c to compat versions.
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*/
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#include <linux/elfcore-compat.h>
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#include <linux/time.h>
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/*
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* Rename the basic ELF layout types to refer to the 32-bit class of files.
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*/
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#undef ELF_CLASS
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#define ELF_CLASS ELFCLASS32
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#undef elfhdr
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#undef elf_phdr
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#undef elf_shdr
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#undef elf_note
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#undef elf_addr_t
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#define elfhdr elf32_hdr
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#define elf_phdr elf32_phdr
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#define elf_shdr elf32_shdr
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#define elf_note elf32_note
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#define elf_addr_t Elf32_Addr
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/*
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* Some data types as stored in coredump.
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*/
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#define user_long_t compat_long_t
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#define user_siginfo_t compat_siginfo_t
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#define copy_siginfo_to_user copy_siginfo_to_user32
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/*
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* The machine-dependent core note format types are defined in elfcore-compat.h,
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* which requires asm/elf.h to define compat_elf_gregset_t et al.
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*/
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#define elf_prstatus compat_elf_prstatus
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#define elf_prpsinfo compat_elf_prpsinfo
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#undef ns_to_timeval
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#define ns_to_timeval ns_to_old_timeval32
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/*
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* To use this file, asm/elf.h must define compat_elf_check_arch.
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* The other following macros can be defined if the compat versions
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* differ from the native ones, or omitted when they match.
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*/
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#undef ELF_ARCH
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#undef elf_check_arch
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#define elf_check_arch compat_elf_check_arch
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#ifdef COMPAT_ELF_PLATFORM
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#undef ELF_PLATFORM
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#define ELF_PLATFORM COMPAT_ELF_PLATFORM
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#endif
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#ifdef COMPAT_ELF_HWCAP
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#undef ELF_HWCAP
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#define ELF_HWCAP COMPAT_ELF_HWCAP
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#endif
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#ifdef COMPAT_ELF_HWCAP2
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#undef ELF_HWCAP2
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#define ELF_HWCAP2 COMPAT_ELF_HWCAP2
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#endif
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#ifdef COMPAT_ARCH_DLINFO
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#undef ARCH_DLINFO
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#define ARCH_DLINFO COMPAT_ARCH_DLINFO
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#endif
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#ifdef COMPAT_ELF_ET_DYN_BASE
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#undef ELF_ET_DYN_BASE
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#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
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#endif
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#ifdef COMPAT_ELF_EXEC_PAGESIZE
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#undef ELF_EXEC_PAGESIZE
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#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
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#endif
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#ifdef COMPAT_ELF_PLAT_INIT
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#undef ELF_PLAT_INIT
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#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
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#endif
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#ifdef COMPAT_SET_PERSONALITY
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#undef SET_PERSONALITY
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#define SET_PERSONALITY COMPAT_SET_PERSONALITY
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#endif
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#ifdef compat_start_thread
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#undef start_thread
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#define start_thread compat_start_thread
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#endif
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#ifdef compat_arch_setup_additional_pages
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#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
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#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
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#undef arch_setup_additional_pages
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#define arch_setup_additional_pages compat_arch_setup_additional_pages
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#endif
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/*
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* Rename a few of the symbols that binfmt_elf.c will define.
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* These are all local so the names don't really matter, but it
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* might make some debugging less confusing not to duplicate them.
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*/
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#define elf_format compat_elf_format
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#define init_elf_binfmt init_compat_elf_binfmt
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#define exit_elf_binfmt exit_compat_elf_binfmt
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/*
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* We share all the actual code with the native (64-bit) version.
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*/
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#include "binfmt_elf.c"
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