/*-
 * 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)