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/* $NetBSD: profile.h,v 1.4 2021/02/10 12:31:34 ryo Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#ifdef __aarch64__
#define _MCOUNT_DECL void mcount
/*
* Cannot implement mcount in C as GCC will trash the ip register when it
* pushes a trapframe. Pity we cannot insert assembly before the function
* prologue.
*/
#define MCOUNT_ASM_NAME "_mcount" /* gcc */
#define MCOUNT_ASM_NAME_ALIAS "__mcount" /* llvm */
#define PLTSYM
#define MCOUNT \
__asm(".text"); \
__asm(".align 6"); \
__asm(".type " MCOUNT_ASM_NAME ",@function"); \
__asm(".global " MCOUNT_ASM_NAME); \
__asm(".global " MCOUNT_ASM_NAME_ALIAS); \
__asm(MCOUNT_ASM_NAME ":"); \
__asm(MCOUNT_ASM_NAME_ALIAS ":"); \
/* \
* Preserve registers that are trashed during mcount \
*/ \
__asm("stp x29, x30, [sp, #-80]!"); \
__asm("stp x0, x1, [sp, #16]"); \
__asm("stp x2, x3, [sp, #32]"); \
__asm("stp x4, x5, [sp, #48]"); \
__asm("stp x6, x7, [sp, #64]"); \
/* \
* find the return address for mcount, \
* and the return address for mcount's caller. \
* \
* frompcindex = pc pushed by call into self. \
*/ \
__asm("ldr x0, [x29, #8]"); \
/* \
* selfpc = pc pushed by mcount call \
*/ \
__asm("mov x1, x30"); \
/* \
* Call the real mcount code \
*/ \
__asm("bl " ___STRING(_C_LABEL(mcount))); \
/* \
* Restore registers that were trashed during mcount \
*/ \
__asm("ldp x0, x1, [sp, #16]"); \
__asm("ldp x2, x3, [sp, #32]"); \
__asm("ldp x4, x5, [sp, #48]"); \
__asm("ldp x6, x7, [sp, #64]"); \
__asm("ldp x29, x30, [sp], #80"); \
__asm("ret"); \
__asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME);
#ifdef _KERNEL
#define MCOUNT_ENTER \
__asm __volatile ("mrs %x0, daif; msr daifset, #3": "=r"(s):: "memory")
#define MCOUNT_EXIT \
__asm __volatile ("msr daif, %x0":: "r"(s): "memory")
#endif /* _KERNEL */
#elif defined(__arm__)
#include <arm/profile.h>
#endif
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