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(function_trace_stop), %g1
  28         lduw            [%g1 + %lo(function_trace_stop)], %g2
  29         brnz,pn         %g2, 2f
  30          sethi          %hi(ftrace_trace_function), %g1
  31         sethi           %hi(ftrace_stub), %g2
  32         ldx             [%g1 + %lo(ftrace_trace_function)], %g1
  33         or              %g2, %lo(ftrace_stub), %g2
  34         cmp             %g1, %g2
  35         be,pn           %icc, 1f
  36          mov            %i7, %g3
  37         save            %sp, -176, %sp
  38         mov             %g3, %o1
  39         jmpl            %g1, %o7
  40          mov            %i7, %o0
  41         ret
  42          restore
  43         /* not reached */
  44 1:
  45 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  46         sethi           %hi(ftrace_graph_return), %g1
  47         ldx             [%g1 + %lo(ftrace_graph_return)], %g3
  48         cmp             %g2, %g3
  49         bne,pn          %xcc, 5f
  50          sethi          %hi(ftrace_graph_entry_stub), %g2
  51         sethi           %hi(ftrace_graph_entry), %g1
  52         or              %g2, %lo(ftrace_graph_entry_stub), %g2
  53         ldx             [%g1 + %lo(ftrace_graph_entry)], %g1
  54         cmp             %g1, %g2
  55         be,pt           %xcc, 2f
  56          nop
  57 5:      mov             %i7, %g2
  58         mov             %fp, %g3
  59         save            %sp, -176, %sp
  60         mov             %g2, %l0
  61         ba,pt           %xcc, ftrace_graph_caller
  62          mov            %g3, %l1
  63 #endif
  64 2:
  65 #endif
  66 #endif
  67         retl
  68          nop
  69         .size           _mcount,.-_mcount
  70         .size           mcount,.-mcount
  71
  72 #ifdef CONFIG_FUNCTION_TRACER
  73         .globl          ftrace_stub
  74         .type           ftrace_stub,#function
  75 ftrace_stub:
  76         retl
  77          nop
  78         .size           ftrace_stub,.-ftrace_stub
  79 #ifdef CONFIG_DYNAMIC_FTRACE
  80         .globl          ftrace_caller
  81         .type           ftrace_caller,#function
  82 ftrace_caller:
  83         sethi           %hi(function_trace_stop), %g1
  84         mov             %i7, %g2
  85         lduw            [%g1 + %lo(function_trace_stop)], %g1
  86         brnz,pn         %g1, ftrace_stub
  87          mov            %fp, %g3
  88         save            %sp, -176, %sp
  89         mov             %g2, %o1
  90         mov             %g2, %l0
  91         mov             %g3, %l1
  92         .globl          ftrace_call
  93 ftrace_call:
  94         call            ftrace_stub
  95          mov            %i7, %o0
  96 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  97         .globl          ftrace_graph_call
  98 ftrace_graph_call:
  99         call            ftrace_stub
 100          nop
 101 #endif
 102         ret
 103          restore
 104 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 105         .size           ftrace_graph_call,.-ftrace_graph_call
 106 #endif
 107         .size           ftrace_call,.-ftrace_call
 108         .size           ftrace_caller,.-ftrace_caller
 109 #endif
 110 #endif
 111
 112 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 113 ENTRY(ftrace_graph_caller)
 114         mov             %l0, %o0
 115         mov             %i7, %o1
 116         call            prepare_ftrace_return
 117          mov            %l1, %o2
 118         ret
 119          restore        %o0, -8, %i7
 120 END(ftrace_graph_caller)
 121
 122 ENTRY(return_to_handler)
 123         save            %sp, -176, %sp
 124         call            ftrace_return_to_handler
 125          mov            %fp, %o0
 126         jmpl            %o0 + 8, %g0
 127          restore
 128 END(return_to_handler)
 129 #endif