1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2deae26bfSKyle McMartin #ifndef _UNWIND_H_ 3deae26bfSKyle McMartin #define _UNWIND_H_ 4deae26bfSKyle McMartin 5deae26bfSKyle McMartin #include <linux/list.h> 6deae26bfSKyle McMartin 7c8921d72SHelge Deller /* Max number of levels to backtrace */ 8c8921d72SHelge Deller #define MAX_UNWIND_ENTRIES 30 9c8921d72SHelge Deller 10deae26bfSKyle McMartin /* From ABI specifications */ 11deae26bfSKyle McMartin struct unwind_table_entry { 12deae26bfSKyle McMartin unsigned int region_start; 13deae26bfSKyle McMartin unsigned int region_end; 14deae26bfSKyle McMartin unsigned int Cannot_unwind:1; /* 0 */ 15deae26bfSKyle McMartin unsigned int Millicode:1; /* 1 */ 16deae26bfSKyle McMartin unsigned int Millicode_save_sr0:1; /* 2 */ 17deae26bfSKyle McMartin unsigned int Region_description:2; /* 3..4 */ 18deae26bfSKyle McMartin unsigned int reserved1:1; /* 5 */ 19deae26bfSKyle McMartin unsigned int Entry_SR:1; /* 6 */ 20deae26bfSKyle McMartin unsigned int Entry_FR:4; /* number saved *//* 7..10 */ 21deae26bfSKyle McMartin unsigned int Entry_GR:5; /* number saved *//* 11..15 */ 22deae26bfSKyle McMartin unsigned int Args_stored:1; /* 16 */ 23deae26bfSKyle McMartin unsigned int Variable_Frame:1; /* 17 */ 24deae26bfSKyle McMartin unsigned int Separate_Package_Body:1; /* 18 */ 25deae26bfSKyle McMartin unsigned int Frame_Extension_Millicode:1; /* 19 */ 26deae26bfSKyle McMartin unsigned int Stack_Overflow_Check:1; /* 20 */ 27deae26bfSKyle McMartin unsigned int Two_Instruction_SP_Increment:1; /* 21 */ 28deae26bfSKyle McMartin unsigned int Ada_Region:1; /* 22 */ 29deae26bfSKyle McMartin unsigned int cxx_info:1; /* 23 */ 30deae26bfSKyle McMartin unsigned int cxx_try_catch:1; /* 24 */ 31deae26bfSKyle McMartin unsigned int sched_entry_seq:1; /* 25 */ 32deae26bfSKyle McMartin unsigned int reserved2:1; /* 26 */ 33deae26bfSKyle McMartin unsigned int Save_SP:1; /* 27 */ 34deae26bfSKyle McMartin unsigned int Save_RP:1; /* 28 */ 35deae26bfSKyle McMartin unsigned int Save_MRP_in_frame:1; /* 29 */ 36deae26bfSKyle McMartin unsigned int extn_ptr_defined:1; /* 30 */ 37deae26bfSKyle McMartin unsigned int Cleanup_defined:1; /* 31 */ 38deae26bfSKyle McMartin 39deae26bfSKyle McMartin unsigned int MPE_XL_interrupt_marker:1; /* 0 */ 40deae26bfSKyle McMartin unsigned int HP_UX_interrupt_marker:1; /* 1 */ 41deae26bfSKyle McMartin unsigned int Large_frame:1; /* 2 */ 42deae26bfSKyle McMartin unsigned int Pseudo_SP_Set:1; /* 3 */ 43deae26bfSKyle McMartin unsigned int reserved4:1; /* 4 */ 44deae26bfSKyle McMartin unsigned int Total_frame_size:27; /* 5..31 */ 45deae26bfSKyle McMartin }; 46deae26bfSKyle McMartin 47deae26bfSKyle McMartin struct unwind_table { 48deae26bfSKyle McMartin struct list_head list; 49deae26bfSKyle McMartin const char *name; 50deae26bfSKyle McMartin unsigned long gp; 51deae26bfSKyle McMartin unsigned long base_addr; 52deae26bfSKyle McMartin unsigned long start; 53deae26bfSKyle McMartin unsigned long end; 54deae26bfSKyle McMartin const struct unwind_table_entry *table; 55deae26bfSKyle McMartin unsigned long length; 56deae26bfSKyle McMartin }; 57deae26bfSKyle McMartin 58deae26bfSKyle McMartin struct unwind_frame_info { 59deae26bfSKyle McMartin struct task_struct *t; 60deae26bfSKyle McMartin /* Eventually we would like to be able to get at any of the registers 61deae26bfSKyle McMartin available; but for now we only try to get the sp and ip for each 62deae26bfSKyle McMartin frame */ 63deae26bfSKyle McMartin /* struct pt_regs regs; */ 64deae26bfSKyle McMartin unsigned long sp, ip, rp, r31; 65deae26bfSKyle McMartin unsigned long prev_sp, prev_ip; 66deae26bfSKyle McMartin }; 67deae26bfSKyle McMartin 68deae26bfSKyle McMartin struct unwind_table * 69deae26bfSKyle McMartin unwind_table_add(const char *name, unsigned long base_addr, 70deae26bfSKyle McMartin unsigned long gp, void *start, void *end); 71deae26bfSKyle McMartin void 72deae26bfSKyle McMartin unwind_table_remove(struct unwind_table *table); 73deae26bfSKyle McMartin 74deae26bfSKyle McMartin void unwind_frame_init(struct unwind_frame_info *info, struct task_struct *t, 75deae26bfSKyle McMartin struct pt_regs *regs); 76*9e0d5c45SHelge Deller void unwind_frame_init_from_blocked_task(struct unwind_frame_info *info, 77*9e0d5c45SHelge Deller struct task_struct *t); 78*9e0d5c45SHelge Deller void unwind_frame_init_task(struct unwind_frame_info *info, 79*9e0d5c45SHelge Deller struct task_struct *task, struct pt_regs *regs); 80deae26bfSKyle McMartin int unwind_once(struct unwind_frame_info *info); 81deae26bfSKyle McMartin int unwind_to_user(struct unwind_frame_info *info); 82deae26bfSKyle McMartin 83f0514ae3SJames Bottomley int unwind_init(void); 84f0514ae3SJames Bottomley 85deae26bfSKyle McMartin #endif 86