kernel/arch/metag/kernel/ftrace_stub.S

   1 /*
   2  * Copyright (C) 2008 Imagination Technologies Ltd.
   3  * Licensed under the GPL
   4  *
   5  */
   6
   7 #include <asm/ftrace.h>
   8
   9         .text
  10 #ifdef CONFIG_DYNAMIC_FTRACE
  11         .global _mcount_wrapper
  12         .type   _mcount_wrapper,function
  13 _mcount_wrapper:
  14         MOV     PC,D0.4
  15
  16         .global _ftrace_caller
  17         .type   _ftrace_caller,function
  18 _ftrace_caller:
  19         MSETL   [A0StP], D0Ar6, D0Ar4, D0Ar2, D0.4
  20         MOV     D1Ar1, D0.4
  21         MOV     D0Ar2, D1RtP
  22         SUB     D1Ar1,D1Ar1,#MCOUNT_INSN_SIZE
  23
  24         .global _ftrace_call
  25 _ftrace_call:
  26         MOVT    D1RtP,#HI(_ftrace_stub)
  27         CALL    D1RtP,#LO(_ftrace_stub)
  28         GETL    D0.4,  D1RtP, [A0StP++#(-8)]
  29         GETL    D0Ar2, D1Ar1, [A0StP++#(-8)]
  30         GETL    D0Ar4, D1Ar3, [A0StP++#(-8)]
  31         GETL    D0Ar6, D1Ar5, [A0StP++#(-8)]
  32         MOV     PC, D0.4
  33 #else
  34
  35         .global _mcount_wrapper
  36         .type   _mcount_wrapper,function
  37 _mcount_wrapper:
  38         MSETL   [A0StP], D0Ar6, D0Ar4, D0Ar2, D0.4
  39         MOV     D1Ar1, D0.4
  40         MOV     D0Ar2, D1RtP
  41         MOVT    D0Re0,#HI(_ftrace_trace_function)
  42         ADD     D0Re0,D0Re0,#LO(_ftrace_trace_function)
  43         GET     D1Ar3,[D0Re0]
  44         MOVT    D1Re0,#HI(_ftrace_stub)
  45         ADD     D1Re0,D1Re0,#LO(_ftrace_stub)
  46         CMP     D1Ar3,D1Re0
  47         BEQ     $Ltrace_exit
  48         MOV     D1RtP,D1Ar3
  49         SUB     D1Ar1,D1Ar1,#MCOUNT_INSN_SIZE
  50         SWAP    PC,D1RtP
  51 $Ltrace_exit:
  52         GETL    D0.4,  D1RtP, [A0StP++#(-8)]
  53         GETL    D0Ar2, D1Ar1, [A0StP++#(-8)]
  54         GETL    D0Ar4, D1Ar3, [A0StP++#(-8)]
  55         GETL    D0Ar6, D1Ar5, [A0StP++#(-8)]
  56         MOV     PC, D0.4
  57
  58 #endif  /* CONFIG_DYNAMIC_FTRACE */
  59
  60         .global _ftrace_stub
  61 _ftrace_stub:
  62         MOV     PC,D1RtP