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2522fe45 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2f79e48a RM |
2 | /* |
3 | * 32-bit compatibility support for ELF format executables and core dumps. | |
4 | * | |
5 | * Copyright (C) 2007 Red Hat, Inc. All rights reserved. | |
6 | * | |
2f79e48a RM |
7 | * Red Hat Author: Roland McGrath. |
8 | * | |
9 | * This file is used in a 64-bit kernel that wants to support 32-bit ELF. | |
10 | * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros | |
11 | * used below, with definitions appropriate for 32-bit ABI compatibility. | |
12 | * | |
13 | * We use macros to rename the ABI types and machine-dependent | |
14 | * functions used in binfmt_elf.c to compat versions. | |
15 | */ | |
16 | ||
17 | #include <linux/elfcore-compat.h> | |
18 | #include <linux/time.h> | |
19 | ||
20 | /* | |
21 | * Rename the basic ELF layout types to refer to the 32-bit class of files. | |
22 | */ | |
23 | #undef ELF_CLASS | |
24 | #define ELF_CLASS ELFCLASS32 | |
25 | ||
26 | #undef elfhdr | |
27 | #undef elf_phdr | |
1fcccbac | 28 | #undef elf_shdr |
2f79e48a RM |
29 | #undef elf_note |
30 | #undef elf_addr_t | |
31 | #define elfhdr elf32_hdr | |
32 | #define elf_phdr elf32_phdr | |
1fcccbac | 33 | #define elf_shdr elf32_shdr |
2f79e48a RM |
34 | #define elf_note elf32_note |
35 | #define elf_addr_t Elf32_Addr | |
36 | ||
49ae4d4b DV |
37 | /* |
38 | * Some data types as stored in coredump. | |
39 | */ | |
2aa362c4 | 40 | #define user_long_t compat_long_t |
49ae4d4b DV |
41 | #define user_siginfo_t compat_siginfo_t |
42 | #define copy_siginfo_to_user copy_siginfo_to_user32 | |
43 | ||
2f79e48a RM |
44 | /* |
45 | * The machine-dependent core note format types are defined in elfcore-compat.h, | |
46 | * which requires asm/elf.h to define compat_elf_gregset_t et al. | |
47 | */ | |
48 | #define elf_prstatus compat_elf_prstatus | |
49 | #define elf_prpsinfo compat_elf_prpsinfo | |
50 | ||
cd19c364 | 51 | #undef ns_to_timeval |
9afc5eee | 52 | #define ns_to_timeval ns_to_old_timeval32 |
2f79e48a RM |
53 | |
54 | /* | |
55 | * To use this file, asm/elf.h must define compat_elf_check_arch. | |
56 | * The other following macros can be defined if the compat versions | |
57 | * differ from the native ones, or omitted when they match. | |
58 | */ | |
59 | ||
60 | #undef ELF_ARCH | |
61 | #undef elf_check_arch | |
62 | #define elf_check_arch compat_elf_check_arch | |
63 | ||
64 | #ifdef COMPAT_ELF_PLATFORM | |
65 | #undef ELF_PLATFORM | |
66 | #define ELF_PLATFORM COMPAT_ELF_PLATFORM | |
67 | #endif | |
68 | ||
69 | #ifdef COMPAT_ELF_HWCAP | |
70 | #undef ELF_HWCAP | |
71 | #define ELF_HWCAP COMPAT_ELF_HWCAP | |
72 | #endif | |
73 | ||
66d6e3b3 AB |
74 | #ifdef COMPAT_ELF_HWCAP2 |
75 | #undef ELF_HWCAP2 | |
76 | #define ELF_HWCAP2 COMPAT_ELF_HWCAP2 | |
77 | #endif | |
78 | ||
2f79e48a RM |
79 | #ifdef COMPAT_ARCH_DLINFO |
80 | #undef ARCH_DLINFO | |
81 | #define ARCH_DLINFO COMPAT_ARCH_DLINFO | |
82 | #endif | |
83 | ||
84 | #ifdef COMPAT_ELF_ET_DYN_BASE | |
85 | #undef ELF_ET_DYN_BASE | |
86 | #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE | |
87 | #endif | |
88 | ||
89 | #ifdef COMPAT_ELF_EXEC_PAGESIZE | |
90 | #undef ELF_EXEC_PAGESIZE | |
91 | #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE | |
92 | #endif | |
93 | ||
94 | #ifdef COMPAT_ELF_PLAT_INIT | |
95 | #undef ELF_PLAT_INIT | |
96 | #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT | |
97 | #endif | |
98 | ||
99 | #ifdef COMPAT_SET_PERSONALITY | |
100 | #undef SET_PERSONALITY | |
101 | #define SET_PERSONALITY COMPAT_SET_PERSONALITY | |
102 | #endif | |
103 | ||
104 | #ifdef compat_start_thread | |
105 | #undef start_thread | |
106 | #define start_thread compat_start_thread | |
107 | #endif | |
108 | ||
109 | #ifdef compat_arch_setup_additional_pages | |
110 | #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES | |
111 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 | |
112 | #undef arch_setup_additional_pages | |
113 | #define arch_setup_additional_pages compat_arch_setup_additional_pages | |
114 | #endif | |
115 | ||
116 | /* | |
117 | * Rename a few of the symbols that binfmt_elf.c will define. | |
118 | * These are all local so the names don't really matter, but it | |
119 | * might make some debugging less confusing not to duplicate them. | |
120 | */ | |
121 | #define elf_format compat_elf_format | |
122 | #define init_elf_binfmt init_compat_elf_binfmt | |
123 | #define exit_elf_binfmt exit_compat_elf_binfmt | |
124 | ||
125 | /* | |
126 | * We share all the actual code with the native (64-bit) version. | |
127 | */ | |
128 | #include "binfmt_elf.c" |