1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: head/lib/libstand/amd64/_setjmp.S 223695 2011-06-30 16:08:56Z dfr $ 33 */ 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 environment 'a'. 42 * The previous signal state is NOT restored. 43 */ 44 45#include <machine/asm.h> 46 47ENTRY(_setjmp) 48 movq %rdi,%rax 49 movq 0(%rsp),%rdx /* retval */ 50 movq %rdx, 0(%rax) /* 0; retval */ 51 movq %rbx, 8(%rax) /* 1; rbx */ 52 movq %rsp,16(%rax) /* 2; rsp */ 53 movq %rbp,24(%rax) /* 3; rbp */ 54 movq %r12,32(%rax) /* 4; r12 */ 55 movq %r13,40(%rax) /* 5; r13 */ 56 movq %r14,48(%rax) /* 6; r14 */ 57 movq %r15,56(%rax) /* 7; r15 */ 58 fnstcw 64(%rax) /* 8; fpu cw */ 59 stmxcsr 68(%rax) /* and mxcsr */ 60 xorq %rax,%rax 61 ret 62END(_setjmp) 63 64 .weak CNAME(_longjmp) 65ENTRY(_longjmp) 66 movq %rdi,%rdx 67 /* Restore the mxcsr, but leave exception flags intact. */ 68 stmxcsr -4(%rsp) 69 movl 68(%rdx),%eax 70 andl $0xffffffc0,%eax 71 movl -4(%rsp),%edi 72 andl $0x3f,%edi 73 xorl %eax,%edi 74 movl %edi,-4(%rsp) 75 ldmxcsr -4(%rsp) 76 movq %rsi,%rax /* retval */ 77 movq 0(%rdx),%rcx 78 movq 8(%rdx),%rbx 79 movq 16(%rdx),%rsp 80 movq 24(%rdx),%rbp 81 movq 32(%rdx),%r12 82 movq 40(%rdx),%r13 83 movq 48(%rdx),%r14 84 movq 56(%rdx),%r15 85 fldcw 64(%rdx) 86 testq %rax,%rax 87 jnz 1f 88 incq %rax 891: movq %rcx,0(%rsp) 90 ret 91END(_longjmp) 92