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/*
* Copyright (c) 2016, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <asm.S>
#ifdef CFG_TA_GPROF_SUPPORT
/*
* Convert return address to call site address by subtracting the size of one
* instruction.
*/
.macro adjust_pc rd, rn
sub \rd, \rn, #4
.endm
/*
* void __utee_mcount(void *return_address)
* @return_address: return address to instrumented function
*
* With the -pg option, the compiler inserts a call to _mcount into
* every function prologue.
* x0 contains the value of lr (x30) before the call, that is the return
* address to the caller of the instrumented function. The callee, i.e. the
* instrumented function itself, is determined from the current value of x30.
* Then we call:
* void __mcount_internal(void *frompc, void *selfpc);
*
* _mcount is defined and set to the value of this function by the linker
* script if the TA is instrumented, i.e., if _mcount is referenced
*/
FUNC __utee_mcount, :
stp x29, x30, [sp, #-16]!
mov x29, sp
adjust_pc x0, x0
adjust_pc x1, x30
bl __mcount_internal
ldp x29, x30, [sp], #16
ret
END_FUNC __utee_mcount
#else /* !CFG_TA_GPROF_SUPPORT */
/*
* The TA linker script always references __utee_mcount so provide a version
* that does nothing
*/
.weak __utee_mcount
FUNC __utee_mcount, :
ret
END_FUNC __utee_mcount
#endif /* CFG_TA_GPROF_SUPPORT */
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