1 #include <linux/sched.h> 2 #include <linux/ftrace.h> 3 #include <asm/ptrace.h> 4 #include <asm/bitops.h> 5 #include <asm/stacktrace.h> 6 #include <asm/unwind.h> 7 8 bool unwind_next_frame(struct unwind_state *state) 9 { 10 struct stack_info *info = &state->stack_info; 11 12 if (unwind_done(state)) 13 return false; 14 15 do { 16 for (state->sp++; state->sp < info->end; state->sp++) 17 if (__kernel_text_address(*state->sp)) 18 return true; 19 20 state->sp = info->next_sp; 21 22 } while (!get_stack_info(state->sp, state->task, info, 23 &state->stack_mask)); 24 25 return false; 26 } 27 EXPORT_SYMBOL_GPL(unwind_next_frame); 28 29 void __unwind_start(struct unwind_state *state, struct task_struct *task, 30 struct pt_regs *regs, unsigned long *first_frame) 31 { 32 memset(state, 0, sizeof(*state)); 33 34 state->task = task; 35 state->sp = first_frame; 36 37 get_stack_info(first_frame, state->task, &state->stack_info, 38 &state->stack_mask); 39 40 if (!__kernel_text_address(*first_frame)) 41 unwind_next_frame(state); 42 } 43 EXPORT_SYMBOL_GPL(__unwind_start); 44