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thunk_64.S

thunk_64.S 1.5 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/linkage.h>
    9. 

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

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

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

  12. 		
    13. 

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

  14. 	.macro thunk name,func
    15. 

  15. 	.globl \name
    16. 

  16. \name:	
    17. 

  17. 	CFI_STARTPROC
    18. 

  18. 	SAVE_ARGS
    19. 

  19. 	call \func
    20. 

  20. 	jmp  restore
    21. 

  21. 	CFI_ENDPROC
    22. 

  22. 	.endm
    23. 

  23. 

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

  25. 	.macro thunk_retrax name,func
    26. 

  26. 	.globl \name
    27. 

  27. \name:	
    28. 

  28. 	CFI_STARTPROC
    29. 

  29. 	SAVE_ARGS
    30. 

  30. 	call \func
    31. 

  31. 	jmp  restore_norax
    32. 

  32. 	CFI_ENDPROC
    33. 

  33. 	.endm
    34. 

  34. 	
    35. 

  35. 

  36. 	.section .sched.text, "ax"
    37. 

  37. #ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
    38. 

  38. 	thunk rwsem_down_read_failed_thunk,rwsem_down_read_failed
    39. 

  39. 	thunk rwsem_down_write_failed_thunk,rwsem_down_write_failed
    40. 

  40. 	thunk rwsem_wake_thunk,rwsem_wake
    41. 

  41. 	thunk rwsem_downgrade_thunk,rwsem_downgrade_wake
    42. 

  42. #endif	
    43. 

  43. 	
    44. 

  44. #ifdef CONFIG_TRACE_IRQFLAGS
    45. 

  45. 	thunk trace_hardirqs_on_thunk,trace_hardirqs_on
    46. 

  46. 	thunk trace_hardirqs_off_thunk,trace_hardirqs_off
    47. 

  47. #endif
    48. 

  48. 

  49. #ifdef CONFIG_DEBUG_LOCK_ALLOC
    50. 

  50. 	thunk lockdep_sys_exit_thunk,lockdep_sys_exit
    51. 

  51. #endif
    52. 

  52. 	
    53. 

  53. 	/* SAVE_ARGS below is used only for the .cfi directives it contains. */
    54. 

  54. 	CFI_STARTPROC
    55. 

  55. 	SAVE_ARGS
    56. 

  56. restore:
    57. 

  57. 	RESTORE_ARGS
    58. 

  58. 	ret	
    59. 

  59. 	CFI_ENDPROC
    60. 

  60. 	
    61. 

  61. 	CFI_STARTPROC
    62. 

  62. 	SAVE_ARGS
    63. 

  63. restore_norax:	
    64. 

  64. 	RESTORE_ARGS 1
    65. 

  65. 	ret
    66. 

  66. 	CFI_ENDPROC
    67.