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 #include <linux/types.h>
9 #include <linux/signal.h>
10 #include <linux/time.h>
11 #include <linux/ptrace.h>
12 #include <linux/fs.h>
13 #include <linux/elf.h>
14 
15 struct coredump_params;
16 
17 struct elf_siginfo
18 {
19 	int	si_signo;			/* signal number */
20 	int	si_code;			/* extra code */
21 	int	si_errno;			/* errno */
22 };
23 
24 /*
25  * Definitions to generate Intel SVR4-like core files.
26  * These mostly have the same names as the SVR4 types with "elf_"
27  * tacked on the front to prevent clashes with linux definitions,
28  * and the typedef forms have been avoided.  This is mostly like
29  * the SVR4 structure, but more Linuxy, with things that Linux does
30  * not support and which gdb doesn't really use excluded.
31  */
32 struct elf_prstatus_common
33 {
34 	struct elf_siginfo pr_info;	/* Info associated with signal */
35 	short	pr_cursig;		/* Current signal */
36 	unsigned long pr_sigpend;	/* Set of pending signals */
37 	unsigned long pr_sighold;	/* Set of held signals */
38 	pid_t	pr_pid;
39 	pid_t	pr_ppid;
40 	pid_t	pr_pgrp;
41 	pid_t	pr_sid;
42 	struct __kernel_old_timeval pr_utime;	/* User time */
43 	struct __kernel_old_timeval pr_stime;	/* System time */
44 	struct __kernel_old_timeval pr_cutime;	/* Cumulative user time */
45 	struct __kernel_old_timeval pr_cstime;	/* Cumulative system time */
46 };
47 
48 struct elf_prstatus
49 {
50 	struct elf_prstatus_common common;
51 	elf_gregset_t pr_reg;	/* GP registers */
52 	int pr_fpvalid;		/* True if math co-processor being used.  */
53 };
54 
55 #define ELF_PRARGSZ	(80)	/* Number of chars for args */
56 
57 struct elf_prpsinfo
58 {
59 	char	pr_state;	/* numeric process state */
60 	char	pr_sname;	/* char for pr_state */
61 	char	pr_zomb;	/* zombie */
62 	char	pr_nice;	/* nice val */
63 	unsigned long pr_flag;	/* flags */
64 	__kernel_uid_t	pr_uid;
65 	__kernel_gid_t	pr_gid;
66 	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
67 	/* Lots missing */
68 	/*
69 	 * The hard-coded 16 is derived from TASK_COMM_LEN, but it can't be
70 	 * changed as it is exposed to userspace. We'd better make it hard-coded
71 	 * here.
72 	 */
73 	char	pr_fname[16];	/* filename of executable */
74 	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
75 };
76 
elf_core_copy_regs(elf_gregset_t * elfregs,struct pt_regs * regs)77 static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
78 {
79 #ifdef ELF_CORE_COPY_REGS
80 	ELF_CORE_COPY_REGS((*elfregs), regs)
81 #else
82 	BUG_ON(sizeof(*elfregs) != sizeof(*regs));
83 	*(struct pt_regs *)elfregs = *regs;
84 #endif
85 }
86 
elf_core_copy_task_regs(struct task_struct * t,elf_gregset_t * elfregs)87 static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
88 {
89 #if defined (ELF_CORE_COPY_TASK_REGS)
90 	return ELF_CORE_COPY_TASK_REGS(t, elfregs);
91 #elif defined (task_pt_regs)
92 	elf_core_copy_regs(elfregs, task_pt_regs(t));
93 #endif
94 	return 0;
95 }
96 
97 extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
98 
elf_core_copy_task_fpregs(struct task_struct * t,struct pt_regs * regs,elf_fpregset_t * fpu)99 static inline int elf_core_copy_task_fpregs(struct task_struct *t, struct pt_regs *regs, elf_fpregset_t *fpu)
100 {
101 #ifdef ELF_CORE_COPY_FPREGS
102 	return ELF_CORE_COPY_FPREGS(t, fpu);
103 #else
104 	return dump_fpu(regs, fpu);
105 #endif
106 }
107 
108 #ifdef CONFIG_ARCH_BINFMT_ELF_EXTRA_PHDRS
109 /*
110  * These functions parameterize elf_core_dump in fs/binfmt_elf.c to write out
111  * extra segments containing the gate DSO contents.  Dumping its
112  * contents makes post-mortem fully interpretable later without matching up
113  * the same kernel and hardware config to see what PC values meant.
114  * Dumping its extra ELF program headers includes all the other information
115  * a debugger needs to easily find how the gate DSO was being used.
116  */
117 extern Elf_Half elf_core_extra_phdrs(struct coredump_params *cprm);
118 extern int
119 elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset);
120 extern int
121 elf_core_write_extra_data(struct coredump_params *cprm);
122 extern size_t elf_core_extra_data_size(struct coredump_params *cprm);
123 #else
elf_core_extra_phdrs(struct coredump_params * cprm)124 static inline Elf_Half elf_core_extra_phdrs(struct coredump_params *cprm)
125 {
126 	return 0;
127 }
128 
elf_core_write_extra_phdrs(struct coredump_params * cprm,loff_t offset)129 static inline int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
130 {
131 	return 1;
132 }
133 
elf_core_write_extra_data(struct coredump_params * cprm)134 static inline int elf_core_write_extra_data(struct coredump_params *cprm)
135 {
136 	return 1;
137 }
138 
elf_core_extra_data_size(struct coredump_params * cprm)139 static inline size_t elf_core_extra_data_size(struct coredump_params *cprm)
140 {
141 	return 0;
142 }
143 #endif /* CONFIG_ARCH_BINFMT_ELF_EXTRA_PHDRS */
144 
145 #endif /* _LINUX_ELFCORE_H */
146