1/* $NetBSD: _setjmp.S,v 1.1 2014/08/10 05:47:36 matt 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#include <machine/asm.h> 33#include "assym.h" 34 35/* 36 * C library -- _setjmp, _longjmp 37 * 38 * _longjmp(a, v) 39 * will generate a "return v;" from the last call to 40 * _setjmp(a) 41 * by restoring registers from the stack. 42 * The previous signal state is NOT restored. 43 * 44 * Note: x0 is the return value 45 */ 46 .section .rodata.cst8,"aM",@progbits,8 47 .align 3 48.L_MAGIC: 49 .xword _JB_MAGIC_AARCH64__SETJMP 50 51ENTRY(_setjmp) 52 adrp x7, .L_MAGIC 53 ldr x7, [x7, #:lo12:.L_MAGIC] 54 55 mov x3, sp 56 57 stp x7, x3, [x0, #_JB_MAGIC] 58 59 stp x19, x20, [x0, #_JB_X19] 60 stp x21, x22, [x0, #_JB_X21] 61 stp x23, x24, [x0, #_JB_X23] 62 stp x25, x26, [x0, #_JB_X25] 63 stp x27, x28, [x0, #_JB_X27] 64 stp x29, x30, [x0, #_JB_X29] 65 66 mrs x5, tpidr_el0 67 str x5, [x0, #_JB_TPIDR] 68 69 stp d8, d9, [x0, #_JB_D8] 70 stp d10, d11, [x0, #_JB_D10] 71 stp d12, d13, [x0, #_JB_D12] 72 stp d14, d15, [x0, #_JB_D14] 73 74 mov x0, xzr 75 ret 76END(_setjmp) 77 78ENTRY(_longjmp) 79 adrp x7, .L_MAGIC 80 ldr x7, [x7, #:lo12:.L_MAGIC] 81 82 ldp x2, x3, [x0, #_JB_MAGIC] 83 ldp x4, x5, [x0, #_JB_X29] 84 85 cbz x3, .Lbotch 86 cbz x4, .Lbotch 87 cbz x5, .Lbotch 88 cmp x2, x7 89 b.ne .Lbotch 90 91 ldp x19, x20, [x0, #_JB_X19] 92 ldp x21, x22, [x0, #_JB_X21] 93 ldp x23, x24, [x0, #_JB_X23] 94 ldp x25, x26, [x0, #_JB_X25] 95 ldp x27, x28, [x0, #_JB_X27] 96 97 ldr x5, [x0, #_JB_TPIDR] 98 msr tpidr_el0, x5 99 100 ldp d8, d9, [x0, #_JB_D8] 101 ldp d10, d11, [x0, #_JB_D10] 102 ldp d12, d13, [x0, #_JB_D12] 103 ldp d14, d15, [x0, #_JB_D14] 104 105 mov sp, x3 106 mov x29, x4 107 mov x30, x5 108 109 mov x0, x1 110 ret 111 112 /* validation failed, die die die. */ 113.Lbotch: 114 bl _C_LABEL(longjmperror) 115 bl _C_LABEL(abort) 1161: b 1b /* Cannot get here */ 117END(_longjmp) 118