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 * 3. 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 33#include <machine/asm.h> 34/* 35 * C library -- _setjmp, _longjmp 36 * 37 * _longjmp(a,v) 38 * will generate a "return(v)" from the last call to 39 * _setjmp(a) 40 * by restoring registers from the environment 'a'. 41 * The previous signal state is NOT restored. 42 */ 43 44ENTRY(_setjmp) 45 movq %rdi,%rax 46 movq 0(%rsp),%rdx /* return address */ 47 movq %rdx, 0(%rax) /* 0; return address */ 48 movq %rbx, 8(%rax) /* 1; rbx */ 49 movq %rsp,16(%rax) /* 2; rsp */ 50 movq %rbp,24(%rax) /* 3; rbp */ 51 movq %r12,32(%rax) /* 4; r12 */ 52 movq %r13,40(%rax) /* 5; r13 */ 53 movq %r14,48(%rax) /* 6; r14 */ 54 movq %r15,56(%rax) /* 7; r15 */ 55 fnstcw 64(%rax) /* 8; fpu cw */ 56 stmxcsr 68(%rax) /* and mxcsr */ 57 xorq %rax,%rax 58 ret 59END(_setjmp) 60 61 WEAK_REFERENCE(___longjmp, _longjmp) 62ENTRY(___longjmp) 63 movq %rdi,%rdx 64 /* Restore the mxcsr, but leave exception flags intact. */ 65 stmxcsr -4(%rsp) 66 movl 68(%rdx),%eax 67 andl $0xffffffc0,%eax 68 movl -4(%rsp),%edi 69 andl $0x3f,%edi 70 xorl %eax,%edi 71 movl %edi,-4(%rsp) 72 ldmxcsr -4(%rsp) 73 movq %rsi,%rax /* retval */ 74 movq 0(%rdx),%rcx 75 movq 8(%rdx),%rbx 76 movq 16(%rdx),%rsp 77 movq 24(%rdx),%rbp 78 movq 32(%rdx),%r12 79 movq 40(%rdx),%r13 80 movq 48(%rdx),%r14 81 movq 56(%rdx),%r15 82 fldcw 64(%rdx) 83 testq %rax,%rax 84 jnz 1f 85 incq %rax 861: movq %rcx,0(%rsp) /* return address */ 87 ret 88END(___longjmp) 89 90 .section .note.GNU-stack,"",%progbits 91