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