/*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) .asciz "@(#)_setjmp.s 5.1 (Berkeley) 4/23/90" #endif /* LIBC_SCCS and not lint */ #include <machine/asm.h> __FBSDID("$FreeBSD$"); /* * C library -- _setjmp, _longjmp * * _longjmp(a,v) * will generate a "return(v)" from the last call to * _setjmp(a) * by restoring registers from the environment 'a'. * The previous signal state is NOT restored. */ ENTRY(_setjmp) movq %rdi,%rax movq 0(%rsp),%rdx /* retval */ movq %rdx, 0(%rax) /* 0; retval */ movq %rbx, 8(%rax) /* 1; rbx */ movq %rsp,16(%rax) /* 2; rsp */ movq %rbp,24(%rax) /* 3; rbp */ movq %r12,32(%rax) /* 4; r12 */ movq %r13,40(%rax) /* 5; r13 */ movq %r14,48(%rax) /* 6; r14 */ movq %r15,56(%rax) /* 7; r15 */ fnstcw 64(%rax) /* 8; fpu cw */ stmxcsr 68(%rax) /* and mxcsr */ xorq %rax,%rax ret END(_setjmp) .weak CNAME(_longjmp) ENTRY(_longjmp) movq %rdi,%rdx /* Restore the mxcsr, but leave exception flags intact. */ stmxcsr -4(%rsp) movl 68(%rdx),%eax andl $0xffffffc0,%eax movl -4(%rsp),%edi andl $0x3f,%edi xorl %eax,%edi movl %edi,-4(%rsp) ldmxcsr -4(%rsp) movq %rsi,%rax /* retval */ movq 0(%rdx),%rcx movq 8(%rdx),%rbx movq 16(%rdx),%rsp movq 24(%rdx),%rbp movq 32(%rdx),%r12 movq 40(%rdx),%r13 movq 48(%rdx),%r14 movq 56(%rdx),%r15 fldcw 64(%rdx) testq %rax,%rax jnz 1f incq %rax 1: movq %rcx,0(%rsp) ret END(_longjmp) |