1 | // SPDX-License-Identifier: GPL-2.0-only |
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 | * |
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 | #define ELF_COMPAT 1 |
21 | |
22 | /* |
23 | * Rename the basic ELF layout types to refer to the 32-bit class of files. |
24 | */ |
25 | #undef ELF_CLASS |
26 | #define ELF_CLASS ELFCLASS32 |
27 | |
28 | #undef elfhdr |
29 | #undef elf_phdr |
30 | #undef elf_shdr |
31 | #undef elf_note |
32 | #undef elf_addr_t |
33 | #undef ELF_GNU_PROPERTY_ALIGN |
34 | #define elfhdr elf32_hdr |
35 | #define elf_phdr elf32_phdr |
36 | #define elf_shdr elf32_shdr |
37 | #define elf_note elf32_note |
38 | #define elf_addr_t Elf32_Addr |
39 | #define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN |
40 | |
41 | /* |
42 | * Some data types as stored in coredump. |
43 | */ |
44 | #define user_long_t compat_long_t |
45 | #define user_siginfo_t compat_siginfo_t |
46 | #define copy_siginfo_to_external copy_siginfo_to_external32 |
47 | |
48 | /* |
49 | * The machine-dependent core note format types are defined in elfcore-compat.h, |
50 | * which requires asm/elf.h to define compat_elf_gregset_t et al. |
51 | */ |
52 | #define elf_prstatus compat_elf_prstatus |
53 | #define elf_prstatus_common compat_elf_prstatus_common |
54 | #define elf_prpsinfo compat_elf_prpsinfo |
55 | |
56 | #undef ns_to_kernel_old_timeval |
57 | #define ns_to_kernel_old_timeval ns_to_old_timeval32 |
58 | |
59 | /* |
60 | * To use this file, asm/elf.h must define compat_elf_check_arch. |
61 | * The other following macros can be defined if the compat versions |
62 | * differ from the native ones, or omitted when they match. |
63 | */ |
64 | |
65 | #undef elf_check_arch |
66 | #define elf_check_arch compat_elf_check_arch |
67 | |
68 | #ifdef COMPAT_ELF_PLATFORM |
69 | #undef ELF_PLATFORM |
70 | #define ELF_PLATFORM COMPAT_ELF_PLATFORM |
71 | #endif |
72 | |
73 | #ifdef COMPAT_ELF_HWCAP |
74 | #undef ELF_HWCAP |
75 | #define ELF_HWCAP COMPAT_ELF_HWCAP |
76 | #endif |
77 | |
78 | #ifdef COMPAT_ELF_HWCAP2 |
79 | #undef ELF_HWCAP2 |
80 | #define ELF_HWCAP2 COMPAT_ELF_HWCAP2 |
81 | #endif |
82 | |
83 | #ifdef COMPAT_ARCH_DLINFO |
84 | #undef ARCH_DLINFO |
85 | #define ARCH_DLINFO COMPAT_ARCH_DLINFO |
86 | #endif |
87 | |
88 | #ifdef COMPAT_ELF_ET_DYN_BASE |
89 | #undef ELF_ET_DYN_BASE |
90 | #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE |
91 | #endif |
92 | |
93 | #ifdef COMPAT_ELF_PLAT_INIT |
94 | #undef ELF_PLAT_INIT |
95 | #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT |
96 | #endif |
97 | |
98 | #ifdef COMPAT_SET_PERSONALITY |
99 | #undef SET_PERSONALITY |
100 | #define SET_PERSONALITY COMPAT_SET_PERSONALITY |
101 | #endif |
102 | |
103 | #ifdef compat_start_thread |
104 | #define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ |
105 | compat_start_thread(regs, new_ip, new_sp) |
106 | #endif |
107 | |
108 | #ifdef COMPAT_START_THREAD |
109 | #undef START_THREAD |
110 | #define START_THREAD COMPAT_START_THREAD |
111 | #endif |
112 | |
113 | #ifdef compat_arch_setup_additional_pages |
114 | #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ |
115 | compat_arch_setup_additional_pages(bprm, interpreter) |
116 | #endif |
117 | |
118 | #ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES |
119 | #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
120 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 |
121 | #undef ARCH_SETUP_ADDITIONAL_PAGES |
122 | #define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES |
123 | #endif |
124 | |
125 | #ifdef compat_elf_read_implies_exec |
126 | #undef elf_read_implies_exec |
127 | #define elf_read_implies_exec compat_elf_read_implies_exec |
128 | #endif |
129 | |
130 | /* |
131 | * Rename a few of the symbols that binfmt_elf.c will define. |
132 | * These are all local so the names don't really matter, but it |
133 | * might make some debugging less confusing not to duplicate them. |
134 | */ |
135 | #define elf_format compat_elf_format |
136 | #define init_elf_binfmt init_compat_elf_binfmt |
137 | #define exit_elf_binfmt exit_compat_elf_binfmt |
138 | #define binfmt_elf_test_cases compat_binfmt_elf_test_cases |
139 | #define binfmt_elf_test_suite compat_binfmt_elf_test_suite |
140 | |
141 | /* |
142 | * We share all the actual code with the native (64-bit) version. |
143 | */ |
144 | #include "binfmt_elf.c" |
145 | |