arch/loongarch/kernel/stacktrace.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Stack trace management functions
   4  *
   5  * Copyright (C) 2022 Loongson Technology Corporation Limited
   6  */
   7 #include <linux/sched.h>
   8 #include <linux/stacktrace.h>
   9
  10 #include <asm/stacktrace.h>
  11 #include <asm/unwind.h>
  12
  13 void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
  14                      struct task_struct *task, struct pt_regs *regs)
  15 {
  16         unsigned long addr;
  17         struct pt_regs dummyregs;
  18         struct unwind_state state;
  19
  20         regs = &dummyregs;
  21
  22         if (task == current) {
  23                 regs->regs[3] = (unsigned long)__builtin_frame_address(0);
  24                 regs->csr_era = (unsigned long)__builtin_return_address(0);
  25         } else {
  26                 regs->regs[3] = thread_saved_fp(task);
  27                 regs->csr_era = thread_saved_ra(task);
  28         }
  29
  30         regs->regs[1] = 0;
  31         for (unwind_start(&state, task, regs);
  32               !unwind_done(&state); unwind_next_frame(&state)) {
  33                 addr = unwind_get_return_address(&state);
  34                 if (!addr || !consume_entry(cookie, addr))
  35                         break;
  36         }
  37 }