arch/parisc/include/asm/unwind.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _UNWIND_H_
   3 #define _UNWIND_H_
   4
   5 #include <linux/list.h>
   6
   7 /* Max number of levels to backtrace */
   8 #define MAX_UNWIND_ENTRIES      30
   9
  10 /* From ABI specifications */
  11 struct unwind_table_entry {
  12         unsigned int region_start;
  13         unsigned int region_end;
  14         unsigned int Cannot_unwind:1; /* 0 */
  15         unsigned int Millicode:1;       /* 1 */
  16         unsigned int Millicode_save_sr0:1;      /* 2 */
  17         unsigned int Region_description:2;      /* 3..4 */
  18         unsigned int reserved1:1;       /* 5 */
  19         unsigned int Entry_SR:1;        /* 6 */
  20         unsigned int Entry_FR:4;        /* number saved *//* 7..10 */
  21         unsigned int Entry_GR:5;        /* number saved *//* 11..15 */
  22         unsigned int Args_stored:1;     /* 16 */
  23         unsigned int Variable_Frame:1;  /* 17 */
  24         unsigned int Separate_Package_Body:1;   /* 18 */
  25         unsigned int Frame_Extension_Millicode:1;       /* 19 */
  26         unsigned int Stack_Overflow_Check:1;    /* 20 */
  27         unsigned int Two_Instruction_SP_Increment:1;    /* 21 */
  28         unsigned int Ada_Region:1;      /* 22 */
  29         unsigned int cxx_info:1;        /* 23 */
  30         unsigned int cxx_try_catch:1;   /* 24 */
  31         unsigned int sched_entry_seq:1; /* 25 */
  32         unsigned int reserved2:1;       /* 26 */
  33         unsigned int Save_SP:1; /* 27 */
  34         unsigned int Save_RP:1; /* 28 */
  35         unsigned int Save_MRP_in_frame:1;       /* 29 */
  36         unsigned int extn_ptr_defined:1;        /* 30 */
  37         unsigned int Cleanup_defined:1; /* 31 */
  38
  39         unsigned int MPE_XL_interrupt_marker:1; /* 0 */
  40         unsigned int HP_UX_interrupt_marker:1;  /* 1 */
  41         unsigned int Large_frame:1;     /* 2 */
  42         unsigned int Pseudo_SP_Set:1;   /* 3 */
  43         unsigned int reserved4:1;       /* 4 */
  44         unsigned int Total_frame_size:27;       /* 5..31 */
  45 };
  46
  47 struct unwind_table {
  48         struct list_head list;
  49         const char *name;
  50         unsigned long gp;
  51         unsigned long base_addr;
  52         unsigned long start;
  53         unsigned long end;
  54         const struct unwind_table_entry *table;
  55         unsigned long length;
  56 };
  57
  58 struct unwind_frame_info {
  59         struct task_struct *t;
  60         /* Eventually we would like to be able to get at any of the registers
  61            available; but for now we only try to get the sp and ip for each
  62            frame */
  63         /* struct pt_regs regs; */
  64         unsigned long sp, ip, rp, r31;
  65         unsigned long prev_sp, prev_ip;
  66 };
  67
  68 struct unwind_table *
  69 unwind_table_add(const char *name, unsigned long base_addr,
  70                  unsigned long gp, void *start, void *end);
  71 void
  72 unwind_table_remove(struct unwind_table *table);
  73
  74 void unwind_frame_init(struct unwind_frame_info *info, struct task_struct *t,
  75                        struct pt_regs *regs);
  76 void unwind_frame_init_from_blocked_task(struct unwind_frame_info *info,
  77                         struct task_struct *t);
  78 void unwind_frame_init_task(struct unwind_frame_info *info,
  79                         struct task_struct *task, struct pt_regs *regs);
  80 int unwind_once(struct unwind_frame_info *info);
  81 int unwind_to_user(struct unwind_frame_info *info);
  82
  83 int unwind_init(void);
  84
  85 #endif