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mcount.S

mcount.S 2.0 KB
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  1. /*
    2. 

  2.  * Copyright IBM Corp. 2008, 2009
    3. 

  3.  *
    4. 

  4.  *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
    5. 

  5.  *
    6. 

  6.  */
    7. 

  7. 

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

  9. #include <asm/asm-offsets.h>
    10. 

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

  11. #include <asm/nospec-insn.h>
    12. 

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

  13. 

  14. 	GEN_BR_THUNK %r1
    15. 

  15. 	GEN_BR_THUNK %r14
    16. 

  16. 

  17. 	.section .kprobes.text, "ax"
    18. 

  18. 

  19. ENTRY(ftrace_stub)
    20. 

  20. 	BR_EX	%r14
    21. 

  21. 

  22. #define STACK_FRAME_SIZE  (STACK_FRAME_OVERHEAD + __PT_SIZE)
    23. 

  23. #define STACK_PTREGS	  (STACK_FRAME_OVERHEAD)
    24. 

  24. #define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
    25. 

  25. #define STACK_PTREGS_PSW  (STACK_PTREGS + __PT_PSW)
    26. 

  26. 

  27. ENTRY(_mcount)
    28. 

  28. 	BR_EX	%r14
    29. 

  29. 

  30. ENTRY(ftrace_caller)
    31. 

  31. 	.globl	ftrace_regs_caller
    32. 

  32. 	.set	ftrace_regs_caller,ftrace_caller
    33. 

  33. 	lgr	%r1,%r15
    34. 

  34. #ifndef CC_USING_HOTPATCH
    35. 

  35. 	aghi	%r0,MCOUNT_RETURN_FIXUP
    36. 

  36. #endif
    37. 

  37. 	aghi	%r15,-STACK_FRAME_SIZE
    38. 

  38. 	stg	%r1,__SF_BACKCHAIN(%r15)
    39. 

  39. 	stg	%r1,(STACK_PTREGS_GPRS+15*8)(%r15)
    40. 

  40. 	stg	%r0,(STACK_PTREGS_PSW+8)(%r15)
    41. 

  41. 	stmg	%r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
    42. 

  42. #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
    43. 

  43. 	aghik	%r2,%r0,-MCOUNT_INSN_SIZE
    44. 

  44. 	lgrl	%r4,function_trace_op
    45. 

  45. 	lgrl	%r1,ftrace_trace_function
    46. 

  46. #else
    47. 

  47. 	lgr	%r2,%r0
    48. 

  48. 	aghi	%r2,-MCOUNT_INSN_SIZE
    49. 

  49. 	larl	%r4,function_trace_op
    50. 

  50. 	lg	%r4,0(%r4)
    51. 

  51. 	larl	%r1,ftrace_trace_function
    52. 

  52. 	lg	%r1,0(%r1)
    53. 

  53. #endif
    54. 

  54. 	lgr	%r3,%r14
    55. 

  55. 	la	%r5,STACK_PTREGS(%r15)
    56. 

  56. 	BASR_EX	%r14,%r1
    57. 

  57. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
    58. 

  58. # The j instruction gets runtime patched to a nop instruction.
    59. 

  59. # See ftrace_enable_ftrace_graph_caller.
    60. 

  60. ENTRY(ftrace_graph_caller)
    61. 

  61. 	j	ftrace_graph_caller_end
    62. 

  62. 	lg	%r2,(STACK_PTREGS_GPRS+14*8)(%r15)
    63. 

  63. 	lg	%r3,(STACK_PTREGS_PSW+8)(%r15)
    64. 

  64. 	brasl	%r14,prepare_ftrace_return
    65. 

  65. 	stg	%r2,(STACK_PTREGS_GPRS+14*8)(%r15)
    66. 

  66. ftrace_graph_caller_end:
    67. 

  67. 	.globl	ftrace_graph_caller_end
    68. 

  68. #endif
    69. 

  69. 	lg	%r1,(STACK_PTREGS_PSW+8)(%r15)
    70. 

  70. 	lmg	%r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
    71. 

  71. 	BR_EX	%r1
    72. 

  72. 

  73. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
    74. 

  74. 

  75. ENTRY(return_to_handler)
    76. 

  76. 	stmg	%r2,%r5,32(%r15)
    77. 

  77. 	lgr	%r1,%r15
    78. 

  78. 	aghi	%r15,-STACK_FRAME_OVERHEAD
    79. 

  79. 	stg	%r1,__SF_BACKCHAIN(%r15)
    80. 

  80. 	brasl	%r14,ftrace_return_to_handler
    81. 

  81. 	aghi	%r15,STACK_FRAME_OVERHEAD
    82. 

  82. 	lgr	%r14,%r2
    83. 

  83. 	lmg	%r2,%r5,32(%r15)
    84. 

  84. 	BR_EX	%r14
    85. 

  85. 

  86. #endif
    87.