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 86