1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2022-2023 Loongson Technology Corporation Limited 4 */ 5 #include <linux/kernel.h> 6 #include <linux/ftrace.h> 7 8 #include <asm/unwind.h> 9 10 bool default_next_frame(struct unwind_state *state) 11 { 12 struct stack_info *info = &state->stack_info; 13 unsigned long addr; 14 15 if (unwind_done(state)) 16 return false; 17 18 do { 19 for (state->sp += sizeof(unsigned long); 20 state->sp < info->end; state->sp += sizeof(unsigned long)) { 21 addr = *(unsigned long *)(state->sp); 22 state->pc = unwind_graph_addr(state, addr, state->sp + 8); 23 if (__kernel_text_address(state->pc)) 24 return true; 25 } 26 27 state->sp = info->next_sp; 28 29 } while (!get_stack_info(state->sp, state->task, info)); 30 31 return false; 32 } 33