149232773SQing Zhang /* SPDX-License-Identifier: GPL-2.0 */ 249232773SQing Zhang /* 349232773SQing Zhang * Most of this ideas comes from x86. 449232773SQing Zhang * 549232773SQing Zhang * Copyright (C) 2022 Loongson Technology Corporation Limited 649232773SQing Zhang */ 749232773SQing Zhang #ifndef _ASM_UNWIND_H 849232773SQing Zhang #define _ASM_UNWIND_H 949232773SQing Zhang 1049232773SQing Zhang #include <linux/sched.h> 1149232773SQing Zhang 1249232773SQing Zhang #include <asm/stacktrace.h> 1349232773SQing Zhang 14*49aef111SQing Zhang enum unwinder_type { 15*49aef111SQing Zhang UNWINDER_GUESS, 16*49aef111SQing Zhang UNWINDER_PROLOGUE, 17*49aef111SQing Zhang }; 18*49aef111SQing Zhang 1949232773SQing Zhang struct unwind_state { 20*49aef111SQing Zhang char type; /* UNWINDER_XXX */ 2149232773SQing Zhang struct stack_info stack_info; 2249232773SQing Zhang struct task_struct *task; 2349232773SQing Zhang bool first, error; 24*49aef111SQing Zhang unsigned long sp, pc, ra; 2549232773SQing Zhang }; 2649232773SQing Zhang 2749232773SQing Zhang void unwind_start(struct unwind_state *state, 2849232773SQing Zhang struct task_struct *task, struct pt_regs *regs); 2949232773SQing Zhang bool unwind_next_frame(struct unwind_state *state); 3049232773SQing Zhang unsigned long unwind_get_return_address(struct unwind_state *state); 3149232773SQing Zhang 3249232773SQing Zhang static inline bool unwind_done(struct unwind_state *state) 3349232773SQing Zhang { 3449232773SQing Zhang return state->stack_info.type == STACK_TYPE_UNKNOWN; 3549232773SQing Zhang } 3649232773SQing Zhang 3749232773SQing Zhang static inline bool unwind_error(struct unwind_state *state) 3849232773SQing Zhang { 3949232773SQing Zhang return state->error; 4049232773SQing Zhang } 4149232773SQing Zhang 4249232773SQing Zhang #endif /* _ASM_UNWIND_H */ 43