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thunk_64.S

thunk_64.S 1.7 KB
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  1. /*
    2. 

  2.  * Save registers before calling assembly functions. This avoids
    3. 

  3.  * disturbance of register allocation in some inline assembly constructs.
    4. 

  4.  * Copyright 2001,2002 by Andi Kleen, SuSE Labs.
    5. 

  5.  * Added trace_hardirqs callers - Copyright 2007 Steven Rostedt, Red Hat, Inc.
    6. 

  6.  * Subject to the GNU public license, v.2. No warranty of any kind.
    7. 

  7.  */
    8. 

  8. #include <linux/linkage.h>
    9. 

  9. #include <asm/dwarf2.h>
    10. 

  10. #include <asm/calling.h>
    11. 

  11. #include <asm/asm.h>
    12. 

  12. 

  13. 	/* rdi:	arg1 ... normal C conventions. rax is saved/restored. */
    14. 

  14. 	.macro THUNK name, func, put_ret_addr_in_rdi=0
    15. 

  15. 	.globl \name
    16. 

  16. \name:
    17. 

  17. 	CFI_STARTPROC
    18. 

  18. 

  19. 	/* this one pushes 9 elems, the next one would be %rIP */
    20. 

  20. 	pushq_cfi_reg rdi
    21. 

  21. 	pushq_cfi_reg rsi
    22. 

  22. 	pushq_cfi_reg rdx
    23. 

  23. 	pushq_cfi_reg rcx
    24. 

  24. 	pushq_cfi_reg rax
    25. 

  25. 	pushq_cfi_reg r8
    26. 

  26. 	pushq_cfi_reg r9
    27. 

  27. 	pushq_cfi_reg r10
    28. 

  28. 	pushq_cfi_reg r11
    29. 

  29. 

  30. 	.if \put_ret_addr_in_rdi
    31. 

  31. 	/* 9*8(%rsp) is return addr on stack */
    32. 

  32. 	movq_cfi_restore 9*8, rdi
    33. 

  33. 	.endif
    34. 

  34. 

  35. 	call \func
    36. 

  36. 	jmp  restore
    37. 

  37. 	CFI_ENDPROC
    38. 

  38. 	_ASM_NOKPROBE(\name)
    39. 

  39. 	.endm
    40. 

  40. 

  41. #ifdef CONFIG_TRACE_IRQFLAGS
    42. 

  42. 	THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1
    43. 

  43. 	THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
    44. 

  44. #endif
    45. 

  45. 

  46. #ifdef CONFIG_DEBUG_LOCK_ALLOC
    47. 

  47. 	THUNK lockdep_sys_exit_thunk,lockdep_sys_exit
    48. 

  48. #endif
    49. 

  49. 

  50. #ifdef CONFIG_PREEMPT
    51. 

  51. 	THUNK ___preempt_schedule, preempt_schedule
    52. 

  52. #ifdef CONFIG_CONTEXT_TRACKING
    53. 

  53. 	THUNK ___preempt_schedule_context, preempt_schedule_context
    54. 

  54. #endif
    55. 

  55. #endif
    56. 

  56. 

  57. #if defined(CONFIG_TRACE_IRQFLAGS) \
    58. 

  58.  || defined(CONFIG_DEBUG_LOCK_ALLOC) \
    59. 

  59.  || defined(CONFIG_PREEMPT)
    60. 

  60. 	CFI_STARTPROC
    61. 

  61. 	CFI_ADJUST_CFA_OFFSET 9*8
    62. 

  62. restore:
    63. 

  63. 	popq_cfi_reg r11
    64. 

  64. 	popq_cfi_reg r10
    65. 

  65. 	popq_cfi_reg r9
    66. 

  66. 	popq_cfi_reg r8
    67. 

  67. 	popq_cfi_reg rax
    68. 

  68. 	popq_cfi_reg rcx
    69. 

  69. 	popq_cfi_reg rdx
    70. 

  70. 	popq_cfi_reg rsi
    71. 

  71. 	popq_cfi_reg rdi
    72. 

  72. 	ret
    73. 

  73. 	CFI_ENDPROC
    74. 

  74. 	_ASM_NOKPROBE(restore)
    75. 

  75. #endif
    76.