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 * @(#)setjmp.s 5.1 (Berkeley) 4/23/90 33 * $FreeBSD: src/lib/libc/amd64/gen/setjmp.S,v 1.29 2008/11/02 01:10:54 peter Exp $ 34 */ 35 36#include <machine/asm.h> 37 38/* 39 * C library -- _setjmp, _longjmp 40 * 41 * longjmp(a,v) 42 * will generate a "return(v)" from the last call to 43 * setjmp(a) 44 * by restoring registers from the environment 'a'. 45 * The previous signal state is restored. 46 */ 47 48#include "SYS.h" 49 50ENTRY(setjmp) 51 pushq %rdi 52 movq %rdi,%rcx 53 movq $1,%rdi /* SIG_BLOCK */ 54 movq $0,%rsi /* (sigset_t*)set */ 55 leaq 72(%rcx),%rdx /* 9,10; (sigset_t*)oset */ 56 call PIC_PLT(CNAME(_sigprocmask)) 57 popq %rdi 58 movq %rdi,%rcx 59 movq 0(%rsp),%rdx /* retval */ 60 movq %rdx, 0(%rcx) /* 0; retval */ 61 movq %rbx, 8(%rcx) /* 1; rbx */ 62 movq %rsp,16(%rcx) /* 2; rsp */ 63 movq %rbp,24(%rcx) /* 3; rbp */ 64 movq %r12,32(%rcx) /* 4; r12 */ 65 movq %r13,40(%rcx) /* 5; r13 */ 66 movq %r14,48(%rcx) /* 6; r14 */ 67 movq %r15,56(%rcx) /* 7; r15 */ 68 fnstcw 64(%rcx) /* 8; fpu cw */ 69 stmxcsr 68(%rcx) /* and mxcsr */ 70 xorq %rax,%rax 71 ret 72END(setjmp) 73 74 .weak CNAME(longjmp) 75 .set CNAME(longjmp),CNAME(__longjmp) 76ENTRY(__longjmp) 77 pushq %rdi 78 pushq %rsi 79 movq %rdi,%rdx 80 movq $3,%rdi /* SIG_SETMASK */ 81 leaq 72(%rdx),%rsi /* (sigset_t*)set */ 82 movq $0,%rdx /* (sigset_t*)oset */ 83 call PIC_PLT(CNAME(_sigprocmask)) 84 popq %rsi 85 popq %rdi /* jmpbuf */ 86 movq %rdi,%rdx 87 /* Restore the mxcsr, but leave exception flags intact. */ 88 stmxcsr -4(%rsp) 89 movl 68(%rdx),%eax 90 andl $0xffffffc0,%eax 91 movl -4(%rsp),%edi 92 andl $0x3f,%edi 93 xorl %eax,%edi 94 movl %edi,-4(%rsp) 95 ldmxcsr -4(%rsp) 96 movq %rsi,%rax /* retval */ 97 movq 0(%rdx),%rcx 98 movq 8(%rdx),%rbx 99 movq 16(%rdx),%rsp 100 movq 24(%rdx),%rbp 101 movq 32(%rdx),%r12 102 movq 40(%rdx),%r13 103 movq 48(%rdx),%r14 104 movq 56(%rdx),%r15 105 fldcw 64(%rdx) 106 testq %rax,%rax 107 jnz 1f 108 incq %rax 1091: movq %rcx,0(%rsp) 110 ret 111END(__longjmp) 112