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