/* $NetBSD: _setjmp.S,v 1.3.6.2 2021/10/13 16:03:07 martin 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. */ #include #include "assym.h" /* * C library -- _setjmp, _longjmp * * _longjmp(a, v) * will generate a "return v;" from the last call to * _setjmp(a) * by restoring registers from the stack. * The previous signal state is NOT restored. * * Note: x0 is the return value */ .section .rodata.cst8,"aM",@progbits,8 .align 3 .L_MAGIC: .xword _JB_MAGIC_AARCH64__SETJMP ENTRY(_setjmp) adrp x7, .L_MAGIC ldr x7, [x7, #:lo12:.L_MAGIC] mov x3, sp stp x7, x3, [x0, #_JB_MAGIC] stp x19, x20, [x0, #_JB_X19] stp x21, x22, [x0, #_JB_X21] stp x23, x24, [x0, #_JB_X23] stp x25, x26, [x0, #_JB_X25] stp x27, x28, [x0, #_JB_X27] stp x29, x30, [x0, #_JB_X29] stp d8, d9, [x0, #_JB_D8] stp d10, d11, [x0, #_JB_D10] stp d12, d13, [x0, #_JB_D12] stp d14, d15, [x0, #_JB_D14] mov x0, xzr ret END(_setjmp) ENTRY(_longjmp) adrp x7, .L_MAGIC ldr x7, [x7, #:lo12:.L_MAGIC] ldp x2, x3, [x0, #_JB_MAGIC] ldp x4, x5, [x0, #_JB_X29] cbz x3, .Lbotch cbz x5, .Lbotch cmp x2, x7 b.ne .Lbotch ldp x19, x20, [x0, #_JB_X19] ldp x21, x22, [x0, #_JB_X21] ldp x23, x24, [x0, #_JB_X23] ldp x25, x26, [x0, #_JB_X25] ldp x27, x28, [x0, #_JB_X27] ldp d8, d9, [x0, #_JB_D8] ldp d10, d11, [x0, #_JB_D10] ldp d12, d13, [x0, #_JB_D12] ldp d14, d15, [x0, #_JB_D14] mov sp, x3 mov x29, x4 mov x30, x5 cmp x1, #0 csinc x0, x1, xzr, ne ret /* validation failed, die die die. */ .Lbotch: bl _C_LABEL(longjmperror) bl _C_LABEL(abort) 1: b 1b /* Cannot get here */ END(_longjmp)