1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_ELF_H
3 #define _LINUX_ELF_H
4
5 #include <linux/types.h>
6 #include <asm/elf.h>
7 #include <uapi/linux/elf.h>
8
9 #ifndef elf_read_implies_exec
10 /* Executables for which elf_read_implies_exec() returns TRUE will
11 have the READ_IMPLIES_EXEC personality flag set automatically.
12 Override in asm/elf.h as needed. */
13 # define elf_read_implies_exec(ex, have_pt_gnu_stack) 0
14 #endif
15 #ifndef SET_PERSONALITY
16 #define SET_PERSONALITY(ex) \
17 set_personality(PER_LINUX | (current->personality & (~PER_MASK)))
18 #endif
19
20 #ifndef SET_PERSONALITY2
21 #define SET_PERSONALITY2(ex, state) \
22 SET_PERSONALITY(ex)
23 #endif
24
25 #ifndef START_THREAD
26 #define START_THREAD(elf_ex, regs, elf_entry, start_stack) \
27 start_thread(regs, elf_entry, start_stack)
28 #endif
29
30 #if defined(ARCH_HAS_SETUP_ADDITIONAL_PAGES) && !defined(ARCH_SETUP_ADDITIONAL_PAGES)
31 #define ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
32 arch_setup_additional_pages(bprm, interpreter)
33 #endif
34
35 #define ELF32_GNU_PROPERTY_ALIGN 4
36 #define ELF64_GNU_PROPERTY_ALIGN 8
37
38 #if ELF_CLASS == ELFCLASS32
39
40 extern Elf32_Dyn _DYNAMIC [];
41 #define elfhdr elf32_hdr
42 #define elf_phdr elf32_phdr
43 #define elf_shdr elf32_shdr
44 #define elf_note elf32_note
45 #define elf_addr_t Elf32_Off
46 #define Elf_Half Elf32_Half
47 #define Elf_Word Elf32_Word
48 #define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN
49
50 #else
51
52 extern Elf64_Dyn _DYNAMIC [];
53 #define elfhdr elf64_hdr
54 #define elf_phdr elf64_phdr
55 #define elf_shdr elf64_shdr
56 #define elf_note elf64_note
57 #define elf_addr_t Elf64_Off
58 #define Elf_Half Elf64_Half
59 #define Elf_Word Elf64_Word
60 #define ELF_GNU_PROPERTY_ALIGN ELF64_GNU_PROPERTY_ALIGN
61
62 #endif
63
64 /* Optional callbacks to write extra ELF notes. */
65 struct file;
66 struct coredump_params;
67
68 #ifndef CONFIG_ARCH_HAVE_EXTRA_ELF_NOTES
69 static inline int elf_coredump_extra_notes_size(void) { return 0; }
70 static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) { return 0; }
71 #else
72 extern int elf_coredump_extra_notes_size(void);
73 extern int elf_coredump_extra_notes_write(struct coredump_params *cprm);
74 #endif
75
76 /*
77 * NT_GNU_PROPERTY_TYPE_0 header:
78 * Keep this internal until/unless there is an agreed UAPI definition.
79 * pr_type values (GNU_PROPERTY_*) are public and defined in the UAPI header.
80 */
81 struct gnu_property {
82 u32 pr_type;
83 u32 pr_datasz;
84 };
85
86 struct arch_elf_state;
87
88 #ifndef CONFIG_ARCH_USE_GNU_PROPERTY
89 static inline int arch_parse_elf_property(u32 type, const void *data,
90 size_t datasz, bool compat,
91 struct arch_elf_state *arch)
92 {
93 return 0;
94 }
95 #else
96 extern int arch_parse_elf_property(u32 type, const void *data, size_t datasz,
97 bool compat, struct arch_elf_state *arch);
98 #endif
99
100 #ifdef CONFIG_ARCH_HAVE_ELF_PROT
101 int arch_elf_adjust_prot(int prot, const struct arch_elf_state *state,
102 bool has_interp, bool is_interp);
103 #else
104 static inline int arch_elf_adjust_prot(int prot,
105 const struct arch_elf_state *state,
106 bool has_interp, bool is_interp)
107 {
108 return prot;
109 }
110 #endif
111
112 #endif /* _LINUX_ELF_H */
113
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