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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _UNWIND_H_
#define _UNWIND_H_
#include <linux/list.h>
/* Max number of levels to backtrace */
#define MAX_UNWIND_ENTRIES 30
/* From ABI specifications */
struct unwind_table_entry {
unsigned int region_start;
unsigned int region_end;
unsigned int Cannot_unwind:1; /* 0 */
unsigned int Millicode:1; /* 1 */
unsigned int Millicode_save_sr0:1; /* 2 */
unsigned int Region_description:2; /* 3..4 */
unsigned int reserved1:1; /* 5 */
unsigned int Entry_SR:1; /* 6 */
unsigned int Entry_FR:4; /* number saved *//* 7..10 */
unsigned int Entry_GR:5; /* number saved *//* 11..15 */
unsigned int Args_stored:1; /* 16 */
unsigned int Variable_Frame:1; /* 17 */
unsigned int Separate_Package_Body:1; /* 18 */
unsigned int Frame_Extension_Millicode:1; /* 19 */
unsigned int Stack_Overflow_Check:1; /* 20 */
unsigned int Two_Instruction_SP_Increment:1; /* 21 */
unsigned int Ada_Region:1; /* 22 */
unsigned int cxx_info:1; /* 23 */
unsigned int cxx_try_catch:1; /* 24 */
unsigned int sched_entry_seq:1; /* 25 */
unsigned int reserved2:1; /* 26 */
unsigned int Save_SP:1; /* 27 */
unsigned int Save_RP:1; /* 28 */
unsigned int Save_MRP_in_frame:1; /* 29 */
unsigned int extn_ptr_defined:1; /* 30 */
unsigned int Cleanup_defined:1; /* 31 */
unsigned int MPE_XL_interrupt_marker:1; /* 0 */
unsigned int HP_UX_interrupt_marker:1; /* 1 */
unsigned int Large_frame:1; /* 2 */
unsigned int Pseudo_SP_Set:1; /* 3 */
unsigned int reserved4:1; /* 4 */
unsigned int Total_frame_size:27; /* 5..31 */
};
struct unwind_table {
struct list_head list;
const char *name;
unsigned long gp;
unsigned long base_addr;
unsigned long start;
unsigned long end;
const struct unwind_table_entry *table;
unsigned long length;
};
struct unwind_frame_info {
struct task_struct *t;
/* Eventually we would like to be able to get at any of the registers
available; but for now we only try to get the sp and ip for each
frame */
/* struct pt_regs regs; */
unsigned long sp, ip, rp, r31;
unsigned long prev_sp, prev_ip;
};
struct unwind_table *
unwind_table_add(const char *name, unsigned long base_addr,
unsigned long gp, void *start, void *end);
void
unwind_table_remove(struct unwind_table *table);
void unwind_frame_init(struct unwind_frame_info *info, struct task_struct *t,
struct pt_regs *regs);
void unwind_frame_init_from_blocked_task(struct unwind_frame_info *info,
struct task_struct *t);
void unwind_frame_init_task(struct unwind_frame_info *info,
struct task_struct *task, struct pt_regs *regs);
int unwind_once(struct unwind_frame_info *info);
int unwind_to_user(struct unwind_frame_info *info);
int unwind_init(void);
#endif