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stacktrace.h

stacktrace.h 2.1 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. #ifndef _ASM_STACKTRACE_H
    3. 

  3. #define _ASM_STACKTRACE_H
    4. 

  4. 

  5. #include <asm/ptrace.h>
    6. 

  6. #include <asm/asm.h>
    7. 

  7. #include <linux/stringify.h>
    8. 

  8. 

  9. #ifdef CONFIG_KALLSYMS
    10. 

  10. extern int raw_show_trace;
    11. 

  11. extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
    12. 

  12. 				  unsigned long pc, unsigned long *ra);
    13. 

  13. extern unsigned long unwind_stack_by_address(unsigned long stack_page,
    14. 

  14. 					     unsigned long *sp,
    15. 

  15. 					     unsigned long pc,
    16. 

  16. 					     unsigned long *ra);
    17. 

  17. #else
    18. 

  18. #define raw_show_trace 1
    19. 

  19. static inline unsigned long unwind_stack(struct task_struct *task,
    20. 

  20. 	unsigned long *sp, unsigned long pc, unsigned long *ra)
    21. 

  21. {
    22. 

  22. 	return 0;
    23. 

  23. }
    24. 

  24. #endif
    25. 

  25. 

  26. #define STR_PTR_LA    __stringify(PTR_LA)
    27. 

  27. #define STR_LONG_S    __stringify(LONG_S)
    28. 

  28. #define STR_LONG_L    __stringify(LONG_L)
    29. 

  29. #define STR_LONGSIZE  __stringify(LONGSIZE)
    30. 

  30. 

  31. #define STORE_ONE_REG(r) \
    32. 

  32.     STR_LONG_S   " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t"
    33. 

  33. 

  34. static __always_inline void prepare_frametrace(struct pt_regs *regs)
    35. 

  35. {
    36. 

  36. #ifndef CONFIG_KALLSYMS
    37. 

  37. 	/*
    38. 

  38. 	 * Remove any garbage that may be in regs (specially func
    39. 

  39. 	 * addresses) to avoid show_raw_backtrace() to report them
    40. 

  40. 	 */
    41. 

  41. 	memset(regs, 0, sizeof(*regs));
    42. 

  42. #endif
    43. 

  43. 	__asm__ __volatile__(
    44. 

  44. 		".set push\n\t"
    45. 

  45. 		".set noat\n\t"
    46. 

  46. 		/* Store $1 so we can use it */
    47. 

  47. 		STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t"
    48. 

  48. 		/* Store the PC */
    49. 

  49. 		"1: " STR_PTR_LA " $1, 1b\n\t"
    50. 

  50. 		STR_LONG_S " $1,%0\n\t"
    51. 

  51. 		STORE_ONE_REG(2)
    52. 

  52. 		STORE_ONE_REG(3)
    53. 

  53. 		STORE_ONE_REG(4)
    54. 

  54. 		STORE_ONE_REG(5)
    55. 

  55. 		STORE_ONE_REG(6)
    56. 

  56. 		STORE_ONE_REG(7)
    57. 

  57. 		STORE_ONE_REG(8)
    58. 

  58. 		STORE_ONE_REG(9)
    59. 

  59. 		STORE_ONE_REG(10)
    60. 

  60. 		STORE_ONE_REG(11)
    61. 

  61. 		STORE_ONE_REG(12)
    62. 

  62. 		STORE_ONE_REG(13)
    63. 

  63. 		STORE_ONE_REG(14)
    64. 

  64. 		STORE_ONE_REG(15)
    65. 

  65. 		STORE_ONE_REG(16)
    66. 

  66. 		STORE_ONE_REG(17)
    67. 

  67. 		STORE_ONE_REG(18)
    68. 

  68. 		STORE_ONE_REG(19)
    69. 

  69. 		STORE_ONE_REG(20)
    70. 

  70. 		STORE_ONE_REG(21)
    71. 

  71. 		STORE_ONE_REG(22)
    72. 

  72. 		STORE_ONE_REG(23)
    73. 

  73. 		STORE_ONE_REG(24)
    74. 

  74. 		STORE_ONE_REG(25)
    75. 

  75. 		STORE_ONE_REG(26)
    76. 

  76. 		STORE_ONE_REG(27)
    77. 

  77. 		STORE_ONE_REG(28)
    78. 

  78. 		STORE_ONE_REG(29)
    79. 

  79. 		STORE_ONE_REG(30)
    80. 

  80. 		STORE_ONE_REG(31)
    81. 

  81. 		/* Restore $1 */
    82. 

  82. 		STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t"
    83. 

  83. 		".set pop\n\t"
    84. 

  84. 		: "=m" (regs->cp0_epc)
    85. 

  85. 		: "r" (regs->regs)
    86. 

  86. 		: "memory");
    87. 

  87. }
    88. 

  88. 

  89. #endif /* _ASM_STACKTRACE_H */
    90.