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 restored. 42 */ 43 44#include "SYS.h" 45 46ENTRY(setjmp) 47 pushq %rdi 48 movq %rdi,%rcx 49 movq $1,%rdi /* SIG_BLOCK */ 50 movq $0,%rsi /* (sigset_t*)set */ 51 leaq 72(%rcx),%rdx /* 9,10; (sigset_t*)oset */ 52 /* stack is 16-byte aligned */ 53 call __libc_sigprocmask 54 popq %rdi 55 movq %rdi,%rcx 56 movq 0(%rsp),%rdx /* return address */ 57 movq %rdx, 0(%rcx) /* 0; return address */ 58 movq %rbx, 8(%rcx) /* 1; rbx */ 59 movq %rsp,16(%rcx) /* 2; rsp */ 60 movq %rbp,24(%rcx) /* 3; rbp */ 61 movq %r12,32(%rcx) /* 4; r12 */ 62 movq %r13,40(%rcx) /* 5; r13 */ 63 movq %r14,48(%rcx) /* 6; r14 */ 64 movq %r15,56(%rcx) /* 7; r15 */ 65 fnstcw 64(%rcx) /* 8; fpu cw */ 66 stmxcsr 68(%rcx) /* and mxcsr */ 67 xorq %rax,%rax 68 ret 69END(setjmp) 70 71 WEAK_REFERENCE(__longjmp, longjmp) 72ENTRY(__longjmp) 73 pushq %rdi 74 pushq %rsi 75 movq %rdi,%rdx 76 movq $3,%rdi /* SIG_SETMASK */ 77 leaq 72(%rdx),%rsi /* (sigset_t*)set */ 78 movq $0,%rdx /* (sigset_t*)oset */ 79 subq $0x8,%rsp /* make the stack 16-byte aligned */ 80 call __libc_sigprocmask 81 addq $0x8,%rsp 82 popq %rsi 83 popq %rdi /* jmpbuf */ 84 movq %rdi,%rdx 85 /* Restore the mxcsr, but leave exception flags intact. */ 86 stmxcsr -4(%rsp) 87 movl 68(%rdx),%eax 88 andl $0xffffffc0,%eax 89 movl -4(%rsp),%edi 90 andl $0x3f,%edi 91 xorl %eax,%edi 92 movl %edi,-4(%rsp) 93 ldmxcsr -4(%rsp) 94 movq %rsi,%rax /* retval */ 95 movq 0(%rdx),%rcx 96 movq 8(%rdx),%rbx 97 movq 16(%rdx),%rsp 98 movq 24(%rdx),%rbp 99 movq 32(%rdx),%r12 100 movq 40(%rdx),%r13 101 movq 48(%rdx),%r14 102 movq 56(%rdx),%r15 103 fldcw 64(%rdx) 104 testq %rax,%rax 105 jnz 1f 106 incq %rax 1071: movq %rcx,0(%rsp) /* return address */ 108 ret 109END(__longjmp) 110 111 .section .note.GNU-stack,"",%progbits 112