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thunk.S

thunk.S 1.6 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.  */
    7. 

  7. 

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

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

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

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

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

  13. 		
    14. 

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

  15. 	.macro thunk name,func
    16. 

  16. 	.globl \name
    17. 

  17. \name:	
    18. 

  18. 	CFI_STARTPROC
    19. 

  19. 	SAVE_ARGS
    20. 

  20. 	call \func
    21. 

  21. 	jmp  restore
    22. 

  22. 	CFI_ENDPROC
    23. 

  23. 	.endm
    24. 

  24. 

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

  26. 	.macro thunk_retrax name,func
    27. 

  27. 	.globl \name
    28. 

  28. \name:	
    29. 

  29. 	CFI_STARTPROC
    30. 

  30. 	SAVE_ARGS
    31. 

  31. 	call \func
    32. 

  32. 	jmp  restore_norax
    33. 

  33. 	CFI_ENDPROC
    34. 

  34. 	.endm
    35. 

  35. 	
    36. 

  36. 

  37. 	.section .sched.text
    38. 

  38. #ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
    39. 

  39. 	thunk rwsem_down_read_failed_thunk,rwsem_down_read_failed
    40. 

  40. 	thunk rwsem_down_write_failed_thunk,rwsem_down_write_failed
    41. 

  41. 	thunk rwsem_wake_thunk,rwsem_wake
    42. 

  42. 	thunk rwsem_downgrade_thunk,rwsem_downgrade_wake
    43. 

  43. #endif	
    44. 

  44. 	
    45. 

  45. 	thunk __down_failed,__down
    46. 

  46. 	thunk_retrax __down_failed_interruptible,__down_interruptible
    47. 

  47. 	thunk_retrax __down_failed_trylock,__down_trylock
    48. 

  48. 	thunk __up_wakeup,__up
    49. 

  49. 

  50. #ifdef CONFIG_TRACE_IRQFLAGS
    51. 

  51. 	thunk trace_hardirqs_on_thunk,trace_hardirqs_on
    52. 

  52. 	thunk trace_hardirqs_off_thunk,trace_hardirqs_off
    53. 

  53. #endif
    54. 

  54. 	
    55. 

  55. 	/* SAVE_ARGS below is used only for the .cfi directives it contains. */
    56. 

  56. 	CFI_STARTPROC
    57. 

  57. 	SAVE_ARGS
    58. 

  58. restore:
    59. 

  59. 	RESTORE_ARGS
    60. 

  60. 	ret	
    61. 

  61. 	CFI_ENDPROC
    62. 

  62. 	
    63. 

  63. 	CFI_STARTPROC
    64. 

  64. 	SAVE_ARGS
    65. 

  65. restore_norax:	
    66. 

  66. 	RESTORE_ARGS 1
    67. 

  67. 	ret
    68. 

  68. 	CFI_ENDPROC
    69.