92 lines
3.2 KiB
C
92 lines
3.2 KiB
C
/* $NetBSD: profile.h,v 1.1 2014/09/19 17:36:26 matt Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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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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* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RISCV_PROFILE_H_
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#define _RISCV_PROFILE_H_
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#define _MCOUNT_DECL void _mcount
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/*
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* Cannot implement mcount in C as GCC will trash the ip register when it
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* pushes a trapframe. Pity we cannot insert assembly before the function
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* prologue.
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*/
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#define MCOUNT_ASM_NAME "__mcount"
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#define PLTSYM
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#if 0
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#define MCOUNT \
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__asm(".text"); \
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__asm(".align 0"); \
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__asm(".type " MCOUNT_ASM_NAME ",@function"); \
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__asm(".global " MCOUNT_ASM_NAME); \
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__asm(MCOUNT_ASM_NAME ":"); \
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/* \
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* Preserve registers that are trashed during mcount \
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*/ \
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__asm("sub sp, sp, #80"); \
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__asm("stp x29, x30, [sp, #64]"); \
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__asm("add x29, sp, #64"); \
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__asm("stp x0, x1, [x29, #0]"); \
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__asm("stp x2, x3, [x29, #16]"); \
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__asm("stp x4, x5, [x29, #32]"); \
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__asm("stp x6, x7, [x29, #48]"); \
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/* \
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* find the return address for mcount, \
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* and the return address for mcount's caller. \
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* \
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* frompcindex = pc pushed by call into self. \
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*/ \
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__asm("mov x0, x19"); \
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/* \
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* selfpc = pc pushed by mcount call \
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*/ \
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__asm("mov x1, x30"); \
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/* \
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* Call the real mcount code \
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*/ \
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__asm("bl " ___STRING(_C_LABEL(_mcount))); \
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/* \
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* Restore registers that were trashed during mcount \
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*/ \
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__asm("ldp x0, x1, [x29, #0]"); \
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__asm("ldp x2, x3, [x29, #16]"); \
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__asm("ldp x4, x5, [x29, #32]"); \
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__asm("ldp x6, x7, [x29, #48]"); \
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__asm("ldp x29, x30, [x29, #64]"); \
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__asm("add sp, sp, #80"); \
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__asm("ret"); \
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__asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
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#endif
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#endif /* _RISCV_PROFILE_H_ */
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