stacktrace.c 1.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  4. * Copyright (C) 2013 Richard Weinberger <richard@nod.at>
  5. * Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com>
  6. */
  7. #include <linux/kallsyms.h>
  8. #include <linux/kernel.h>
  9. #include <linux/sched.h>
  10. #include <linux/stacktrace.h>
  11. #include <linux/module.h>
  12. #include <linux/uaccess.h>
  13. #include <asm/stacktrace.h>
  14. void dump_trace(struct task_struct *tsk,
  15. const struct stacktrace_ops *ops,
  16. void *data)
  17. {
  18. int reliable = 0;
  19. unsigned long *sp, bp, addr;
  20. struct pt_regs *segv_regs = tsk->thread.segv_regs;
  21. struct stack_frame *frame;
  22. bp = get_frame_pointer(tsk, segv_regs);
  23. sp = get_stack_pointer(tsk, segv_regs);
  24. frame = (struct stack_frame *)bp;
  25. while (((long) sp & (THREAD_SIZE-1)) != 0) {
  26. addr = *sp;
  27. if (__kernel_text_address(addr)) {
  28. reliable = 0;
  29. if ((unsigned long) sp == bp + sizeof(long)) {
  30. frame = frame ? frame->next_frame : NULL;
  31. bp = (unsigned long)frame;
  32. reliable = 1;
  33. }
  34. ops->address(data, addr, reliable);
  35. }
  36. sp++;
  37. }
  38. }
  39. static void save_addr(void *data, unsigned long address, int reliable)
  40. {
  41. struct stack_trace *trace = data;
  42. if (!reliable)
  43. return;
  44. if (trace->nr_entries >= trace->max_entries)
  45. return;
  46. trace->entries[trace->nr_entries++] = address;
  47. }
  48. static const struct stacktrace_ops dump_ops = {
  49. .address = save_addr
  50. };
  51. static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)
  52. {
  53. dump_trace(tsk, &dump_ops, trace);
  54. }
  55. void save_stack_trace(struct stack_trace *trace)
  56. {
  57. __save_stack_trace(current, trace);
  58. }
  59. EXPORT_SYMBOL_GPL(save_stack_trace);
  60. void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  61. {
  62. __save_stack_trace(tsk, trace);
  63. }
  64. EXPORT_SYMBOL_GPL(save_stack_trace_tsk);