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#if defined(LIBC_SCCS) && !defined(lint) 34 .asciz "@(#)_setjmp.s 5.1 (Berkeley) 4/23/90" 35#endif /* LIBC_SCCS and not lint */ 36#include <machine/asm.h> 37__FBSDID("$FreeBSD$"); 38 39/* 40 * C library -- _setjmp, _longjmp 41 * 42 * _longjmp(a,v) 43 * will generate a "return(v)" from the last call to 44 * _setjmp(a) 45 * by restoring registers from the environment 'a'. 46 * The previous signal state is NOT restored. 47 */ 48 49ENTRY(_setjmp) 50 movq %rdi,%rax 51 movq 0(%rsp),%rdx /* retval */ 52 movq %rdx, 0(%rax) /* 0; retval */ 53 movq %rbx, 8(%rax) /* 1; rbx */ 54 movq %rsp,16(%rax) /* 2; rsp */ 55 movq %rbp,24(%rax) /* 3; rbp */ 56 movq %r12,32(%rax) /* 4; r12 */ 57 movq %r13,40(%rax) /* 5; r13 */ 58 movq %r14,48(%rax) /* 6; r14 */ 59 movq %r15,56(%rax) /* 7; r15 */ 60 fnstcw 64(%rax) /* 8; fpu cw */ 61 stmxcsr 68(%rax) /* and mxcsr */ 62 xorq %rax,%rax 63 ret 64END(_setjmp) 65 66 .weak CNAME(_longjmp) 67ENTRY(_longjmp) 68 movq %rdi,%rdx 69 /* Restore the mxcsr, but leave exception flags intact. */ 70 stmxcsr -4(%rsp) 71 movl 68(%rdx),%eax 72 andl $0xffffffc0,%eax 73 movl -4(%rsp),%edi 74 andl $0x3f,%edi 75 xorl %eax,%edi 76 movl %edi,-4(%rsp) 77 ldmxcsr -4(%rsp) 78 movq %rsi,%rax /* retval */ 79 movq 0(%rdx),%rcx 80 movq 8(%rdx),%rbx 81 movq 16(%rdx),%rsp 82 movq 24(%rdx),%rbp 83 movq 32(%rdx),%r12 84 movq 40(%rdx),%r13 85 movq 48(%rdx),%r14 86 movq 56(%rdx),%r15 87 fldcw 64(%rdx) 88 testq %rax,%rax 89 jnz 1f 90 incq %rax 911: movq %rcx,0(%rsp) 92 ret 93END(_longjmp) 94