| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * 32-bit compatibility support for ELF format executables and core dumps. |
| * |
| * Copyright (C) 2007 Red Hat, Inc. All rights reserved. |
| * |
| * 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> |
| |
| #define ELF_COMPAT 1 |
| |
| /* |
| * 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_shdr |
| #undef elf_note |
| #undef elf_addr_t |
| #undef ELF_GNU_PROPERTY_ALIGN |
| #define elfhdr elf32_hdr |
| #define elf_phdr elf32_phdr |
| #define elf_shdr elf32_shdr |
| #define elf_note elf32_note |
| #define elf_addr_t Elf32_Addr |
| #define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN |
| |
| /* |
| * Some data types as stored in coredump. |
| */ |
| #define user_long_t compat_long_t |
| #define user_siginfo_t compat_siginfo_t |
| #define copy_siginfo_to_external copy_siginfo_to_external32 |
| |
| /* |
| * 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_prstatus_common compat_elf_prstatus_common |
| #define elf_prpsinfo compat_elf_prpsinfo |
| |
| #undef ns_to_kernel_old_timeval |
| #define ns_to_kernel_old_timeval ns_to_old_timeval32 |
| |
| /* |
| * 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_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_ELF_HWCAP2 |
| #undef ELF_HWCAP2 |
| #define ELF_HWCAP2 COMPAT_ELF_HWCAP2 |
| #endif |
| |
| #ifdef COMPAT_ELF_HWCAP3 |
| #undef ELF_HWCAP3 |
| #define ELF_HWCAP3 COMPAT_ELF_HWCAP3 |
| #endif |
| |
| #ifdef COMPAT_ELF_HWCAP4 |
| #undef ELF_HWCAP4 |
| #define ELF_HWCAP4 COMPAT_ELF_HWCAP4 |
| #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_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 |
| #define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ |
| compat_start_thread(regs, new_ip, new_sp) |
| #endif |
| |
| #ifdef COMPAT_START_THREAD |
| #undef START_THREAD |
| #define START_THREAD COMPAT_START_THREAD |
| #endif |
| |
| #ifdef compat_arch_setup_additional_pages |
| #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ |
| compat_arch_setup_additional_pages(bprm, interpreter) |
| #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 |
| |
| #ifdef compat_elf_read_implies_exec |
| #undef elf_read_implies_exec |
| #define elf_read_implies_exec compat_elf_read_implies_exec |
| #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 |
| #define binfmt_elf_test_cases compat_binfmt_elf_test_cases |
| #define binfmt_elf_test_suite compat_binfmt_elf_test_suite |
| |
| /* |
| * We share all the actual code with the native (64-bit) version. |
| */ |
| #include "binfmt_elf.c" |
