/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1992, 1993 * The Regents of the University of California. 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 __i386__ #include <i386/profile.h> #else /* !__i386__ */ #ifndef _MACHINE_PROFILE_H_ #define _MACHINE_PROFILE_H_ #ifndef _KERNEL #include <sys/cdefs.h> #define FUNCTION_ALIGNMENT 4 #define _MCOUNT_DECL \ static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \ static void _mcount #define MCOUNT __asm(" \n\ .text \n\ .p2align 4,0x90 \n\ .globl .mcount \n\ .type .mcount,@function \n\ .mcount: \n\ pushq %rdi \n\ pushq %rsi \n\ pushq %rdx \n\ pushq %rcx \n\ pushq %r8 \n\ pushq %r9 \n\ pushq %rax \n\ movq 8(%rbp),%rdi \n\ movq 7*8(%rsp),%rsi \n\ call _mcount \n\ popq %rax \n\ popq %r9 \n\ popq %r8 \n\ popq %rcx \n\ popq %rdx \n\ popq %rsi \n\ popq %rdi \n\ ret \n\ .size .mcount, . - .mcount"); #if 0 /* * We could use this, except it doesn't preserve the registers that were * being passed with arguments to the function that we were inserted * into. I've left it here as documentation of what the code above is * supposed to do. */ #define MCOUNT \ void \ mcount() \ { \ uintfptr_t selfpc, frompc; \ /* \ * Find the return address for mcount, \ * and the return address for mcount's caller. \ * \ * selfpc = pc pushed by call to mcount \ */ \ __asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \ /* \ * frompc = pc pushed by call to mcount's caller. \ * The caller's stack frame has already been built, so %rbp is \ * the caller's frame pointer. The caller's raddr is in the \ * caller's frame following the caller's caller's frame pointer.\ */ \ __asm("movq (%%rbp),%0" : "=r" (frompc)); \ frompc = ((uintfptr_t *)frompc)[1]; \ _mcount(frompc, selfpc); \ } #endif typedef u_long uintfptr_t; /* * An unsigned integral type that can hold non-negative difference between * function pointers. */ typedef u_long fptrdiff_t; __BEGIN_DECLS void mcount(void) __asm(".mcount"); __END_DECLS #endif /* !_KERNEL */ #endif /* !_MACHINE_PROFILE_H_ */ #endif /* __i386__ */
