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f0556e70bb
_mcount() stub when profiling is enabled. Emit this code sequence for assembly routines as welli (MCOUNT definition in <machine/asm.h>. We do not pass the GOT entry however as the 4th argument, because it's not used. The _mcount() stub calls __mcount(), which does the actual work. Define _MCOUNT_DECL to define __mcount. We do not have an implementation of mcount(), so we define MCOUNT as empty, but have a weak alias to _mcount() in _mcount.S. Note that the _mcount() stub in the kernel is slightly different from the stub in userland. This is because we do not have to worry about nested routines in the kernel.
75 lines
2 KiB
ArmAsm
75 lines
2 KiB
ArmAsm
/*
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* Copyright (c) 2004 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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.text
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/*
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* Important registers:
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* r8 structure return address
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* r15 static link (nested routines)
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* rp our return address
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* in0 caller's ar.pfs
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* in1 caller's gp
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* in2 caller's rp
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* in3 GOT entry
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* ar.pfs our pfs
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*/
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ENTRY_NOPROFILE(_mcount, 4)
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alloc loc0 = ar.pfs, 4, 4, 2, 0
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mov loc1 = r8
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mov loc2 = rp
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mov loc3 = r15
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;;
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mov out0 = in2
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mov out1 = rp
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br.call.sptk rp = __mcount
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;;
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1:
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mov gp = in1
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mov r14 = ip
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mov b7 = loc2
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;;
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add r14 = 2f - 1b, r14
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mov ar.pfs = loc0
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mov rp = in2
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;;
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mov r15 = loc3
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mov b7 = r14
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mov b6 = loc2
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mov r8 = loc1
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mov r14 = in0
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br.ret.sptk b7
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;;
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2:
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mov ar.pfs = r14
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br.sptk b6
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;;
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END(_mcount)
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WEAK_ALIAS(mcount, _mcount)
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