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thunk.S

thunk.S 1.9 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. 	 * Subject to the GNU public license, v.2. No warranty of any kind.
    6. 

  6. 	 * $Id: thunk.S,v 1.2 2002/03/13 20:06:58 ak Exp $
    7. 

  7. 	 */
    8. 

  8. 

  9. 	#include <linux/config.h>
    10. 

  10. 	#include <linux/linkage.h>
    11. 

  11. 	#include <asm/dwarf2.h>
    12. 

  12. 	#include <asm/calling.h>			
    13. 

  13. 	#include <asm/rwlock.h>
    14. 

  14. 		
    15. 

  15. 	/* rdi:	arg1 ... normal C conventions. rax is saved/restored. */ 	
    16. 

  16. 	.macro thunk name,func
    17. 

  17. 	.globl \name
    18. 

  18. \name:	
    19. 

  19. 	CFI_STARTPROC
    20. 

  20. 	SAVE_ARGS
    21. 

  21. 	call \func
    22. 

  22. 	jmp  restore
    23. 

  23. 	CFI_ENDPROC
    24. 

  24. 	.endm
    25. 

  25. 

  26. 	/* rdi:	arg1 ... normal C conventions. rax is passed from C. */ 	
    27. 

  27. 	.macro thunk_retrax name,func
    28. 

  28. 	.globl \name
    29. 

  29. \name:	
    30. 

  30. 	CFI_STARTPROC
    31. 

  31. 	SAVE_ARGS
    32. 

  32. 	call \func
    33. 

  33. 	jmp  restore_norax
    34. 

  34. 	CFI_ENDPROC
    35. 

  35. 	.endm
    36. 

  36. 	
    37. 

  37. 

  38. 	.section .sched.text
    39. 

  39. #ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
    40. 

  40. 	thunk rwsem_down_read_failed_thunk,rwsem_down_read_failed
    41. 

  41. 	thunk rwsem_down_write_failed_thunk,rwsem_down_write_failed
    42. 

  42. 	thunk rwsem_wake_thunk,rwsem_wake
    43. 

  43. 	thunk rwsem_downgrade_thunk,rwsem_downgrade_wake
    44. 

  44. #endif	
    45. 

  45. 	
    46. 

  46. 	thunk __down_failed,__down
    47. 

  47. 	thunk_retrax __down_failed_interruptible,__down_interruptible
    48. 

  48. 	thunk_retrax __down_failed_trylock,__down_trylock
    49. 

  49. 	thunk __up_wakeup,__up
    50. 

  50. 	
    51. 

  51. 	/* SAVE_ARGS below is used only for the .cfi directives it contains. */
    52. 

  52. 	CFI_STARTPROC
    53. 

  53. 	SAVE_ARGS
    54. 

  54. restore:
    55. 

  55. 	RESTORE_ARGS
    56. 

  56. 	ret	
    57. 

  57. 	CFI_ENDPROC
    58. 

  58. 	
    59. 

  59. 	CFI_STARTPROC
    60. 

  60. 	SAVE_ARGS
    61. 

  61. restore_norax:	
    62. 

  62. 	RESTORE_ARGS 1
    63. 

  63. 	ret
    64. 

  64. 	CFI_ENDPROC
    65. 

  65. 

  66. #ifdef CONFIG_SMP
    67. 

  67. /* Support for read/write spinlocks. */
    68. 

  68. 	.text
    69. 

  69. /* rax:	pointer to rwlock_t */	
    70. 

  70. ENTRY(__write_lock_failed)
    71. 

  71. 	lock
    72. 

  72. 	addl $RW_LOCK_BIAS,(%rax)
    73. 

  73. 1:	rep
    74. 

  74. 	nop
    75. 

  75. 	cmpl $RW_LOCK_BIAS,(%rax)
    76. 

  76. 	jne 1b
    77. 

  77. 	lock 
    78. 

  78. 	subl $RW_LOCK_BIAS,(%rax)
    79. 

  79. 	jnz  __write_lock_failed
    80. 

  80. 	ret
    81. 

  81. 

  82. /* rax:	pointer to rwlock_t */	
    83. 

  83. ENTRY(__read_lock_failed)
    84. 

  84. 	lock
    85. 

  85. 	incl (%rax)
    86. 

  86. 1:	rep
    87. 

  87. 	nop
    88. 

  88. 	cmpl $1,(%rax)
    89. 

  89. 	js 1b
    90. 

  90. 	lock
    91. 

  91. 	decl (%rax)
    92. 

  92. 	js __read_lock_failed
    93. 

  93. 	ret
    94. 

  94. #endif
    95.