include/linux/elfcore.h

   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         char    pr_fname[16];   /* filename of executable */
  69         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
  70 };
  71
  72 static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
  73 {
  74 #ifdef ELF_CORE_COPY_REGS
  75         ELF_CORE_COPY_REGS((*elfregs), regs)
  76 #else
  77         BUG_ON(sizeof(*elfregs) != sizeof(*regs));
  78         *(struct pt_regs *)elfregs = *regs;
  79 #endif
  80 }
  81
  82 static inline void elf_core_copy_kernel_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
  83 {
  84 #ifdef ELF_CORE_COPY_KERNEL_REGS
  85         ELF_CORE_COPY_KERNEL_REGS((*elfregs), regs);
  86 #else
  87         elf_core_copy_regs(elfregs, regs);
  88 #endif
  89 }
  90
  91 static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
  92 {
  93 #if defined (ELF_CORE_COPY_TASK_REGS)
  94         return ELF_CORE_COPY_TASK_REGS(t, elfregs);
  95 #elif defined (task_pt_regs)
  96         elf_core_copy_regs(elfregs, task_pt_regs(t));
  97 #endif
  98         return 0;
  99 }
 100
 101 extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
 102
 103 static inline int elf_core_copy_task_fpregs(struct task_struct *t, struct pt_regs *regs, elf_fpregset_t *fpu)
 104 {
 105 #ifdef ELF_CORE_COPY_FPREGS
 106         return ELF_CORE_COPY_FPREGS(t, fpu);
 107 #else
 108         return dump_fpu(regs, fpu);
 109 #endif
 110 }
 111
 112 #if defined(CONFIG_UM) || defined(CONFIG_IA64)
 113 /*
 114  * These functions parameterize elf_core_dump in fs/binfmt_elf.c to write out
 115  * extra segments containing the gate DSO contents.  Dumping its
 116  * contents makes post-mortem fully interpretable later without matching up
 117  * the same kernel and hardware config to see what PC values meant.
 118  * Dumping its extra ELF program headers includes all the other information
 119  * a debugger needs to easily find how the gate DSO was being used.
 120  */
 121 extern Elf_Half elf_core_extra_phdrs(void);
 122 extern int
 123 elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset);
 124 extern int
 125 elf_core_write_extra_data(struct coredump_params *cprm);
 126 extern size_t elf_core_extra_data_size(void);
 127 #else
 128 static inline Elf_Half elf_core_extra_phdrs(void)
 129 {
 130         return 0;
 131 }
 132
 133 static inline int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
 134 {
 135         return 1;
 136 }
 137
 138 static inline int elf_core_write_extra_data(struct coredump_params *cprm)
 139 {
 140         return 1;
 141 }
 142
 143 static inline size_t elf_core_extra_data_size(void)
 144 {
 145         return 0;
 146 }
 147 #endif
 148
 149 #endif /* _LINUX_ELFCORE_H */