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/* 38 * C library -- _setjmp, _longjmp 39 * 40 * longjmp(a,v) 41 * will generate a "return(v)" from the last call to 42 * setjmp(a) 43 * by restoring registers from the environment 'a'. 44 * The previous signal state is restored. 45 */ 46 47#include "SYS.h" 48 49ENTRY(setjmp) 50 pushq %rdi 51 movq %rdi,%rcx 52 movq $1,%rdi /* SIG_BLOCK */ 53 movq $0,%rsi /* (sigset_t*)set */ 54 leaq 72(%rcx),%rdx /* 9,10; (sigset_t*)oset */ 55 /* stack is 16-byte aligned */ 56 call __libc_sigprocmask 57 popq %rdi 58 movq %rdi,%rcx 59 movq 0(%rsp),%rdx /* return address */ 60 movq %rdx, 0(%rcx) /* 0; return address */ 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_REFERENCE(__longjmp, longjmp) 75ENTRY(__longjmp) 76 pushq %rdi 77 pushq %rsi 78 movq %rdi,%rdx 79 movq $3,%rdi /* SIG_SETMASK */ 80 leaq 72(%rdx),%rsi /* (sigset_t*)set */ 81 movq $0,%rdx /* (sigset_t*)oset */ 82 subq $0x8,%rsp /* make the stack 16-byte aligned */ 83 call __libc_sigprocmask 84 addq $0x8,%rsp 85 popq %rsi 86 popq %rdi /* jmpbuf */ 87 movq %rdi,%rdx 88 /* Restore the mxcsr, but leave exception flags intact. */ 89 stmxcsr -4(%rsp) 90 movl 68(%rdx),%eax 91 andl $0xffffffc0,%eax 92 movl -4(%rsp),%edi 93 andl $0x3f,%edi 94 xorl %eax,%edi 95 movl %edi,-4(%rsp) 96 ldmxcsr -4(%rsp) 97 movq %rsi,%rax /* retval */ 98 movq 0(%rdx),%rcx 99 movq 8(%rdx),%rbx 100 movq 16(%rdx),%rsp 101 movq 24(%rdx),%rbp 102 movq 32(%rdx),%r12 103 movq 40(%rdx),%r13 104 movq 48(%rdx),%r14 105 movq 56(%rdx),%r15 106 fldcw 64(%rdx) 107 testq %rax,%rax 108 jnz 1f 109 incq %rax 1101: movq %rcx,0(%rsp) /* return address */ 111 ret 112END(__longjmp) 113 114 .section .note.GNU-stack,"",%progbits 115