18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Most of this ideas comes from x86. 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Copyright (C) 2020 Loongson Technology Corporation Limited 68c2ecf20Sopenharmony_ci */ 78c2ecf20Sopenharmony_ci#ifndef _ASM_UNWIND_H 88c2ecf20Sopenharmony_ci#define _ASM_UNWIND_H 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci#include <linux/module.h> 118c2ecf20Sopenharmony_ci#include <linux/ftrace.h> 128c2ecf20Sopenharmony_ci#include <linux/sched.h> 138c2ecf20Sopenharmony_ci 148c2ecf20Sopenharmony_ci#include <asm/ptrace.h> 158c2ecf20Sopenharmony_ci#include <asm/stacktrace.h> 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_cistruct unwind_state { 188c2ecf20Sopenharmony_ci struct stack_info stack_info; 198c2ecf20Sopenharmony_ci struct task_struct *task; 208c2ecf20Sopenharmony_ci int graph_idx; 218c2ecf20Sopenharmony_ci#if defined(CONFIG_UNWINDER_PROLOGUE) 228c2ecf20Sopenharmony_ci unsigned long sp, pc, ra; 238c2ecf20Sopenharmony_ci bool enable; 248c2ecf20Sopenharmony_ci bool first; 258c2ecf20Sopenharmony_ci#elif defined(CONFIG_UNWINDER_ORC) 268c2ecf20Sopenharmony_ci unsigned long sp, pc, fp, ra; 278c2ecf20Sopenharmony_ci#else /* CONFIG_UNWINDER_GUESS */ 288c2ecf20Sopenharmony_ci unsigned long sp, pc; 298c2ecf20Sopenharmony_ci bool first; 308c2ecf20Sopenharmony_ci#endif 318c2ecf20Sopenharmony_ci bool error, is_ftrace; 328c2ecf20Sopenharmony_ci}; 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_civoid unwind_start(struct unwind_state *state, struct task_struct *task, 358c2ecf20Sopenharmony_ci struct pt_regs *regs); 368c2ecf20Sopenharmony_cibool unwind_next_frame(struct unwind_state *state); 378c2ecf20Sopenharmony_ciunsigned long unwind_get_return_address(struct unwind_state *state); 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_cistatic inline bool unwind_done(struct unwind_state *state) 408c2ecf20Sopenharmony_ci{ 418c2ecf20Sopenharmony_ci return state->stack_info.type == STACK_TYPE_UNKNOWN; 428c2ecf20Sopenharmony_ci} 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_cistatic inline bool unwind_error(struct unwind_state *state) 458c2ecf20Sopenharmony_ci{ 468c2ecf20Sopenharmony_ci return state->error; 478c2ecf20Sopenharmony_ci} 488c2ecf20Sopenharmony_ci 498c2ecf20Sopenharmony_ci#ifdef CONFIG_UNWINDER_ORC 508c2ecf20Sopenharmony_civoid unwind_init(void); 518c2ecf20Sopenharmony_civoid unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size); 528c2ecf20Sopenharmony_ci#else 538c2ecf20Sopenharmony_cistatic inline void unwind_init(void) {} 548c2ecf20Sopenharmony_cistatic inline void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size) {} 558c2ecf20Sopenharmony_ci#endif /* CONFIG_UNWINDER_ORC */ 568c2ecf20Sopenharmony_ci 578c2ecf20Sopenharmony_ci#define GRAPH_FAKE_OFFSET (sizeof(struct pt_regs) - offsetof(struct pt_regs, regs[1])) 588c2ecf20Sopenharmony_ci 598c2ecf20Sopenharmony_cistatic inline unsigned long unwind_graph_addr(struct unwind_state *state, 608c2ecf20Sopenharmony_ci unsigned long pc, unsigned long cfa) 618c2ecf20Sopenharmony_ci{ 628c2ecf20Sopenharmony_ci return ftrace_graph_ret_addr(state->task, &state->graph_idx, 638c2ecf20Sopenharmony_ci pc, (unsigned long *)(cfa - GRAPH_FAKE_OFFSET)); 648c2ecf20Sopenharmony_ci} 658c2ecf20Sopenharmony_ci#endif /* _ASM_UNWIND_H */ 66