1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_UNWIND_H 3 #define _ASM_X86_UNWIND_H 4 5 #include <linux/sched.h> 6 #include <linux/ftrace.h> 7 #include <asm/ptrace.h> 8 #include <asm/stacktrace.h> 9 10 struct unwind_state { 11 struct stack_info stack_info; 12 unsigned long stack_mask; 13 struct task_struct *task; 14 int graph_idx; 15 bool error; 16 #if defined(CONFIG_UNWINDER_ORC) 17 bool signal, full_regs; 18 unsigned long sp, bp, ip; 19 struct pt_regs *regs; 20 #elif defined(CONFIG_UNWINDER_FRAME_POINTER) 21 bool got_irq; 22 unsigned long *bp, *orig_sp, ip; 23 struct pt_regs *regs; 24 #else 25 unsigned long *sp; 26 #endif 27 }; 28 29 void __unwind_start(struct unwind_state *state, struct task_struct *task, 30 struct pt_regs *regs, unsigned long *first_frame); 31 bool unwind_next_frame(struct unwind_state *state); 32 unsigned long unwind_get_return_address(struct unwind_state *state); 33 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state); 34 35 static inline bool unwind_done(struct unwind_state *state) 36 { 37 return state->stack_info.type == STACK_TYPE_UNKNOWN; 38 } 39 40 static inline bool unwind_error(struct unwind_state *state) 41 { 42 return state->error; 43 } 44 45 static inline 46 void unwind_start(struct unwind_state *state, struct task_struct *task, 47 struct pt_regs *regs, unsigned long *first_frame) 48 { 49 first_frame = first_frame ? : get_stack_pointer(task, regs); 50 51 __unwind_start(state, task, regs, first_frame); 52 } 53 54 #if defined(CONFIG_UNWINDER_ORC) || defined(CONFIG_UNWINDER_FRAME_POINTER) 55 static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state) 56 { 57 if (unwind_done(state)) 58 return NULL; 59 60 return state->regs; 61 } 62 #else 63 static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state) 64 { 65 return NULL; 66 } 67 #endif 68 69 #ifdef CONFIG_UNWINDER_ORC 70 void unwind_init(void); 71 void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, 72 void *orc, size_t orc_size); 73 #else 74 static inline void unwind_init(void) {} 75 static inline 76 void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, 77 void *orc, size_t orc_size) {} 78 #endif 79 80 /* 81 * This disables KASAN checking when reading a value from another task's stack, 82 * since the other task could be running on another CPU and could have poisoned 83 * the stack in the meantime. 84 */ 85 #define READ_ONCE_TASK_STACK(task, x) \ 86 ({ \ 87 unsigned long val; \ 88 if (task == current) \ 89 val = READ_ONCE(x); \ 90 else \ 91 val = READ_ONCE_NOCHECK(x); \ 92 val; \ 93 }) 94 95 static inline bool task_on_another_cpu(struct task_struct *task) 96 { 97 #ifdef CONFIG_SMP 98 return task != current && task->on_cpu; 99 #else 100 return false; 101 #endif 102 } 103 104 #endif /* _ASM_X86_UNWIND_H */ 105