arch/sparc/lib/mcount.S

   1 /*
   2  * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com)
   3  *
   4  * This file implements mcount(), which is used to collect profiling data.
   5  * This can also be tweaked for kernel stack overflow detection.
   6  */
   7
   8 #include <linux/linkage.h>
   9
  10 /*
  11  * This is the main variant and is called by C code.  GCC's -pg option
  12  * automatically instruments every C function with a call to this.
  13  */
  14
  15         .text
  16         .align          32
  17         .globl          _mcount
  18         .type           _mcount,#function
  19         .globl          mcount
  20         .type           mcount,#function
  21 _mcount:
  22 mcount:
  23 #ifdef CONFIG_FUNCTION_TRACER
  24 #ifdef CONFIG_DYNAMIC_FTRACE
  25         /* Do nothing, the retl/nop below is all we need.  */
  26 #else
  27         sethi           %hi(ftrace_trace_function), %g1
  28         sethi           %hi(ftrace_stub), %g2
  29         ldx             [%g1 + %lo(ftrace_trace_function)], %g1
  30         or              %g2, %lo(ftrace_stub), %g2
  31         cmp             %g1, %g2
  32         be,pn           %icc, 1f
  33          mov            %i7, %g3
  34         save            %sp, -176, %sp
  35         mov             %g3, %o1
  36         jmpl            %g1, %o7
  37          mov            %i7, %o0
  38         ret
  39          restore
  40         /* not reached */
  41 1:
  42 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  43         sethi           %hi(ftrace_graph_return), %g1
  44         ldx             [%g1 + %lo(ftrace_graph_return)], %g3
  45         cmp             %g2, %g3
  46         bne,pn          %xcc, 5f
  47          sethi          %hi(ftrace_graph_entry_stub), %g2
  48         sethi           %hi(ftrace_graph_entry), %g1
  49         or              %g2, %lo(ftrace_graph_entry_stub), %g2
  50         ldx             [%g1 + %lo(ftrace_graph_entry)], %g1
  51         cmp             %g1, %g2
  52         be,pt           %xcc, 2f
  53          nop
  54 5:      mov             %i7, %g2
  55         mov             %fp, %g3
  56         save            %sp, -176, %sp
  57         mov             %g2, %l0
  58         ba,pt           %xcc, ftrace_graph_caller
  59          mov            %g3, %l1
  60 #endif
  61 2:
  62 #endif
  63 #endif
  64         retl
  65          nop
  66         .size           _mcount,.-_mcount
  67         .size           mcount,.-mcount
  68
  69 #ifdef CONFIG_FUNCTION_TRACER
  70         .globl          ftrace_stub
  71         .type           ftrace_stub,#function
  72 ftrace_stub:
  73         retl
  74          nop
  75         .size           ftrace_stub,.-ftrace_stub
  76 #ifdef CONFIG_DYNAMIC_FTRACE
  77         .globl          ftrace_caller
  78         .type           ftrace_caller,#function
  79 ftrace_caller:
  80         mov             %i7, %g2
  81         mov             %fp, %g3
  82         save            %sp, -176, %sp
  83         mov             %g2, %o1
  84         mov             %g2, %l0
  85         mov             %g3, %l1
  86         .globl          ftrace_call
  87 ftrace_call:
  88         call            ftrace_stub
  89          mov            %i7, %o0
  90 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  91         .globl          ftrace_graph_call
  92 ftrace_graph_call:
  93         call            ftrace_stub
  94          nop
  95 #endif
  96         ret
  97          restore
  98 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  99         .size           ftrace_graph_call,.-ftrace_graph_call
 100 #endif
 101         .size           ftrace_call,.-ftrace_call
 102         .size           ftrace_caller,.-ftrace_caller
 103 #endif
 104 #endif
 105
 106 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 107 ENTRY(ftrace_graph_caller)
 108         mov             %l0, %o0
 109         mov             %i7, %o1
 110         call            prepare_ftrace_return
 111          mov            %l1, %o2
 112         ret
 113          restore        %o0, -8, %i7
 114 END(ftrace_graph_caller)
 115
 116 ENTRY(return_to_handler)
 117         save            %sp, -176, %sp
 118         call            ftrace_return_to_handler
 119          mov            %fp, %o0
 120         jmpl            %o0 + 8, %g0
 121          restore
 122 END(return_to_handler)
 123 #endif