elf.h

  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
 40extern 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
 52extern 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. */
 65struct file;
 66struct coredump_params;
 67
 68#ifndef CONFIG_ARCH_HAVE_EXTRA_ELF_NOTES
 69static inline int elf_coredump_extra_notes_size(void) { return 0; }
 70static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) { return 0; }
 71#else
 72extern int elf_coredump_extra_notes_size(void);
 73extern 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 */
 81struct gnu_property {
 82	u32 pr_type;
 83	u32 pr_datasz;
 84};
 85
 86struct arch_elf_state;
 87
 88#ifndef CONFIG_ARCH_USE_GNU_PROPERTY
 89static 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
 96extern 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
101int arch_elf_adjust_prot(int prot, const struct arch_elf_state *state,
102			 bool has_interp, bool is_interp);
103#else
104static 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 */