1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_ELFCORE_H
3#define _LINUX_ELFCORE_H
4
5#include <linux/user.h>
6#include <linux/bug.h>
7#include <linux/sched/task_stack.h>
8
9#include <asm/elf.h>
10#include <uapi/linux/elfcore.h>
11
12struct coredump_params;
13
14static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
15{
16#ifdef ELF_CORE_COPY_REGS
17 ELF_CORE_COPY_REGS((*elfregs), regs)
18#else
19 BUG_ON(sizeof(*elfregs) != sizeof(*regs));
20 *(struct pt_regs *)elfregs = *regs;
21#endif
22}
23
24static inline void elf_core_copy_kernel_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
25{
26#ifdef ELF_CORE_COPY_KERNEL_REGS
27 ELF_CORE_COPY_KERNEL_REGS((*elfregs), regs);
28#else
29 elf_core_copy_regs(elfregs, regs);
30#endif
31}
32
33static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
34{
35#if defined (ELF_CORE_COPY_TASK_REGS)
36 return ELF_CORE_COPY_TASK_REGS(t, elfregs);
37#elif defined (task_pt_regs)
38 elf_core_copy_regs(elfregs, task_pt_regs(t));
39#endif
40 return 0;
41}
42
43extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
44
45static inline int elf_core_copy_task_fpregs(struct task_struct *t, struct pt_regs *regs, elf_fpregset_t *fpu)
46{
47#ifdef ELF_CORE_COPY_FPREGS
48 return ELF_CORE_COPY_FPREGS(t, fpu);
49#else
50 return dump_fpu(regs, fpu);
51#endif
52}
53
54#ifdef ELF_CORE_COPY_XFPREGS
55static inline int elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)
56{
57 return ELF_CORE_COPY_XFPREGS(t, xfpu);
58}
59#endif
60
61/*
62 * These functions parameterize elf_core_dump in fs/binfmt_elf.c to write out
63 * extra segments containing the gate DSO contents. Dumping its
64 * contents makes post-mortem fully interpretable later without matching up
65 * the same kernel and hardware config to see what PC values meant.
66 * Dumping its extra ELF program headers includes all the other information
67 * a debugger needs to easily find how the gate DSO was being used.
68 */
69extern Elf_Half elf_core_extra_phdrs(void);
70extern int
71elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset);
72extern int
73elf_core_write_extra_data(struct coredump_params *cprm);
74extern size_t elf_core_extra_data_size(void);
75
76#endif /* _LINUX_ELFCORE_H */
77