1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _UNWIND_H_ 3*4882a593Smuzhiyun #define _UNWIND_H_ 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/list.h> 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun /* Max number of levels to backtrace */ 8*4882a593Smuzhiyun #define MAX_UNWIND_ENTRIES 30 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun /* From ABI specifications */ 11*4882a593Smuzhiyun struct unwind_table_entry { 12*4882a593Smuzhiyun unsigned int region_start; 13*4882a593Smuzhiyun unsigned int region_end; 14*4882a593Smuzhiyun unsigned int Cannot_unwind:1; /* 0 */ 15*4882a593Smuzhiyun unsigned int Millicode:1; /* 1 */ 16*4882a593Smuzhiyun unsigned int Millicode_save_sr0:1; /* 2 */ 17*4882a593Smuzhiyun unsigned int Region_description:2; /* 3..4 */ 18*4882a593Smuzhiyun unsigned int reserved1:1; /* 5 */ 19*4882a593Smuzhiyun unsigned int Entry_SR:1; /* 6 */ 20*4882a593Smuzhiyun unsigned int Entry_FR:4; /* number saved *//* 7..10 */ 21*4882a593Smuzhiyun unsigned int Entry_GR:5; /* number saved *//* 11..15 */ 22*4882a593Smuzhiyun unsigned int Args_stored:1; /* 16 */ 23*4882a593Smuzhiyun unsigned int Variable_Frame:1; /* 17 */ 24*4882a593Smuzhiyun unsigned int Separate_Package_Body:1; /* 18 */ 25*4882a593Smuzhiyun unsigned int Frame_Extension_Millicode:1; /* 19 */ 26*4882a593Smuzhiyun unsigned int Stack_Overflow_Check:1; /* 20 */ 27*4882a593Smuzhiyun unsigned int Two_Instruction_SP_Increment:1; /* 21 */ 28*4882a593Smuzhiyun unsigned int Ada_Region:1; /* 22 */ 29*4882a593Smuzhiyun unsigned int cxx_info:1; /* 23 */ 30*4882a593Smuzhiyun unsigned int cxx_try_catch:1; /* 24 */ 31*4882a593Smuzhiyun unsigned int sched_entry_seq:1; /* 25 */ 32*4882a593Smuzhiyun unsigned int reserved2:1; /* 26 */ 33*4882a593Smuzhiyun unsigned int Save_SP:1; /* 27 */ 34*4882a593Smuzhiyun unsigned int Save_RP:1; /* 28 */ 35*4882a593Smuzhiyun unsigned int Save_MRP_in_frame:1; /* 29 */ 36*4882a593Smuzhiyun unsigned int extn_ptr_defined:1; /* 30 */ 37*4882a593Smuzhiyun unsigned int Cleanup_defined:1; /* 31 */ 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun unsigned int MPE_XL_interrupt_marker:1; /* 0 */ 40*4882a593Smuzhiyun unsigned int HP_UX_interrupt_marker:1; /* 1 */ 41*4882a593Smuzhiyun unsigned int Large_frame:1; /* 2 */ 42*4882a593Smuzhiyun unsigned int Pseudo_SP_Set:1; /* 3 */ 43*4882a593Smuzhiyun unsigned int reserved4:1; /* 4 */ 44*4882a593Smuzhiyun unsigned int Total_frame_size:27; /* 5..31 */ 45*4882a593Smuzhiyun }; 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun struct unwind_table { 48*4882a593Smuzhiyun struct list_head list; 49*4882a593Smuzhiyun const char *name; 50*4882a593Smuzhiyun unsigned long gp; 51*4882a593Smuzhiyun unsigned long base_addr; 52*4882a593Smuzhiyun unsigned long start; 53*4882a593Smuzhiyun unsigned long end; 54*4882a593Smuzhiyun const struct unwind_table_entry *table; 55*4882a593Smuzhiyun unsigned long length; 56*4882a593Smuzhiyun }; 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun struct unwind_frame_info { 59*4882a593Smuzhiyun struct task_struct *t; 60*4882a593Smuzhiyun /* Eventually we would like to be able to get at any of the registers 61*4882a593Smuzhiyun available; but for now we only try to get the sp and ip for each 62*4882a593Smuzhiyun frame */ 63*4882a593Smuzhiyun /* struct pt_regs regs; */ 64*4882a593Smuzhiyun unsigned long sp, ip, rp, r31; 65*4882a593Smuzhiyun unsigned long prev_sp, prev_ip; 66*4882a593Smuzhiyun }; 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun struct unwind_table * 69*4882a593Smuzhiyun unwind_table_add(const char *name, unsigned long base_addr, 70*4882a593Smuzhiyun unsigned long gp, void *start, void *end); 71*4882a593Smuzhiyun void 72*4882a593Smuzhiyun unwind_table_remove(struct unwind_table *table); 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun void unwind_frame_init(struct unwind_frame_info *info, struct task_struct *t, 75*4882a593Smuzhiyun struct pt_regs *regs); 76*4882a593Smuzhiyun void unwind_frame_init_from_blocked_task(struct unwind_frame_info *info, 77*4882a593Smuzhiyun struct task_struct *t); 78*4882a593Smuzhiyun void unwind_frame_init_task(struct unwind_frame_info *info, 79*4882a593Smuzhiyun struct task_struct *task, struct pt_regs *regs); 80*4882a593Smuzhiyun int unwind_once(struct unwind_frame_info *info); 81*4882a593Smuzhiyun int unwind_to_user(struct unwind_frame_info *info); 82*4882a593Smuzhiyun 83*4882a593Smuzhiyun int unwind_init(void); 84*4882a593Smuzhiyun 85*4882a593Smuzhiyun #endif 86