1 /* $NetBSD: profile.h,v 1.2 2020/04/23 23:22:41 jakllsch Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifdef __aarch64__ 33 34 #define _MCOUNT_DECL void _mcount 35 36 /* 37 * Cannot implement mcount in C as GCC will trash the ip register when it 38 * pushes a trapframe. Pity we cannot insert assembly before the function 39 * prologue. 40 */ 41 42 #define MCOUNT_ASM_NAME "__mcount" 43 #define PLTSYM 44 45 #define MCOUNT \ 46 __asm(".text"); \ 47 __asm(".align 0"); \ 48 __asm(".type " MCOUNT_ASM_NAME ",@function"); \ 49 __asm(".global " MCOUNT_ASM_NAME); \ 50 __asm(MCOUNT_ASM_NAME ":"); \ 51 /* \ 52 * Preserve registers that are trashed during mcount \ 53 */ \ 54 __asm("stp x29, x30, [sp, #-80]!"); \ 55 __asm("stp x0, x1, [sp, #16]"); \ 56 __asm("stp x2, x3, [sp, #32]"); \ 57 __asm("stp x4, x5, [sp, #48]"); \ 58 __asm("stp x6, x7, [sp, #64]"); \ 59 /* \ 60 * find the return address for mcount, \ 61 * and the return address for mcount's caller. \ 62 * \ 63 * frompcindex = pc pushed by call into self. \ 64 */ \ 65 __asm("ldr x0, [x29, #8]"); \ 66 /* \ 67 * selfpc = pc pushed by mcount call \ 68 */ \ 69 __asm("mov x1, x30"); \ 70 /* \ 71 * Call the real mcount code \ 72 */ \ 73 __asm("bl " ___STRING(_C_LABEL(_mcount))); \ 74 /* \ 75 * Restore registers that were trashed during mcount \ 76 */ \ 77 __asm("ldp x0, x1, [sp, #16]"); \ 78 __asm("ldp x2, x3, [sp, #32]"); \ 79 __asm("ldp x4, x5, [sp, #48]"); \ 80 __asm("ldp x6, x7, [sp, #64]"); \ 81 __asm("ldp x29, x30, [sp], #80"); \ 82 __asm("ret"); \ 83 __asm(".size " MCOUNT_ASM_NAME ", .-" MCOUNT_ASM_NAME); 84 85 #elif defined(__arm__) 86 87 #include <arm/profile.h> 88 89 #endif 90 91