arch/sh/lib/mcount.S

   1 /*
   2  * arch/sh/lib/mcount.S
   3  *
   4  *  Copyright (C) 2008  Paul Mundt
   5  *  Copyright (C) 2008  Matt Fleming
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11 #include <asm/ftrace.h>
  12
  13 #define MCOUNT_ENTER()          \
  14         mov.l   r4, @-r15;      \
  15         mov.l   r5, @-r15;      \
  16         mov.l   r6, @-r15;      \
  17         mov.l   r7, @-r15;      \
  18         sts.l   pr, @-r15;      \
  19                                 \
  20         mov.l   @(20,r15),r4;   \
  21         sts     pr, r5
  22
  23 #define MCOUNT_LEAVE()          \
  24         lds.l   @r15+, pr;      \
  25         mov.l   @r15+, r7;      \
  26         mov.l   @r15+, r6;      \
  27         mov.l   @r15+, r5;      \
  28         rts;                    \
  29          mov.l  @r15+, r4
  30
  31         .align 2
  32         .globl  _mcount
  33         .type   _mcount,@function
  34         .globl  mcount
  35         .type   mcount,@function
  36 _mcount:
  37 mcount:
  38         MCOUNT_ENTER()
  39
  40 #ifdef CONFIG_DYNAMIC_FTRACE
  41         .globl  mcount_call
  42 mcount_call:
  43         mov.l   .Lftrace_stub, r6
  44 #else
  45         mov.l   .Lftrace_trace_function, r6
  46         mov.l   ftrace_stub, r7
  47         cmp/eq  r6, r7
  48         bt      skip_trace
  49         mov.l   @r6, r6
  50 #endif
  51
  52         jsr     @r6
  53          nop
  54
  55 skip_trace:
  56         MCOUNT_LEAVE()
  57
  58         .align 2
  59 .Lftrace_trace_function:
  60         .long   ftrace_trace_function
  61
  62 #ifdef CONFIG_DYNAMIC_FTRACE
  63         .globl ftrace_caller
  64 ftrace_caller:
  65         MCOUNT_ENTER()
  66
  67         .globl ftrace_call
  68 ftrace_call:
  69         mov.l   .Lftrace_stub, r6
  70         jsr     @r6
  71          nop
  72
  73         MCOUNT_LEAVE()
  74 #endif /* CONFIG_DYNAMIC_FTRACE */
  75
  76 /*
  77  * NOTE: From here on the locations of the .Lftrace_stub label and
  78  * ftrace_stub itself are fixed. Adding additional data here will skew
  79  * the displacement for the memory table and break the block replacement.
  80  * Place new labels either after the ftrace_stub body, or before
  81  * ftrace_caller. You have been warned.
  82  */
  83         .align 2
  84 .Lftrace_stub:
  85         .long   ftrace_stub
  86
  87         .globl  ftrace_stub
  88 ftrace_stub:
  89         rts
  90          nop