/*      $OpenBSD: sigsetjmp.S,v 1.10 2023/12/10 16:45:51 deraadt Exp $  */
/*      $NetBSD: __setjmp14.S,v 1.1 2001/06/19 00:25:02 fvdl Exp $      */

/*
 * Copyright (c) 2001 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Frank van der Linden for Wasabi Systems, Inc.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */


#include "SYS.h"
#include <machine/setjmp.h>

        .hidden __jmpxor

/*
 * C library -- _setjmp, _longjmp
 *
 *      longjmp(a,v)
 * will generate a "return(v)" from the last call to
 *      setjmp(a)
 * by restoring registers from the stack.
 * The previous signal state is restored.
 */

ENTRY(sigsetjmp)
        RETGUARD_SETUP(sigsetjmp, r10)
        movl    %esi,(_JB_SIGFLAG  * 8)(%rdi)
        testl   %esi,%esi
        jz      2f

        movq    %rdi,%r8                /* save jmpbuf addr */
        movl    $1,%edi                 /* how = SIG_BLOCK */
        xorl    %esi,%esi               /* set = empty */
        movl    $SYS_sigprocmask,%eax
99:     syscall
        PINSYSCALL(SYS_sigprocmask, 99b)
        movq    %r8,%rdi                /* restore jmpbuf addr */
        movq    %rax,(_JB_SIGMASK * 8)(%rdi)

2:      movq    (%rsp),%r11
        leaq    __jmpxor(%rip),%rcx
        movq    %rbx,(_JB_RBX * 8)(%rdi)
        movq    %rbp,%rax
        xorq    (0*8)(%rcx),%rax
        movq    %rax,(_JB_RBP * 8)(%rdi)
        movq    %r12,(_JB_R12 * 8)(%rdi)
        movq    %r13,(_JB_R13 * 8)(%rdi)
        movq    %r14,(_JB_R14 * 8)(%rdi)
        movq    %r15,(_JB_R15 * 8)(%rdi)
        movq    %rsp,%rax
        xorq    (1*8)(%rcx),%rax
        movq    %rax,(_JB_RSP * 8)(%rdi)
        movq    %r11,%rax
        xorq    (2*8)(%rcx),%rax
        movq    %rax,(_JB_PC  * 8)(%rdi)
        xorq    %rcx,%rcx
        stmxcsr (_JB_MXCSR * 8)(%rdi)
        fnstcw  (_JB_MXCSR * 8 + 4)(%rdi)

        xorq    %rax,%rax
        RETGUARD_CHECK(sigsetjmp, r10)
        ret
END(sigsetjmp)

ENTRY(siglongjmp)
        movq    %rdi,%r12
        movl    %esi,%r8d
        cmpl    $0, (_JB_SIGFLAG * 8)(%rdi)
        jz      2f

        movq    (_JB_SIGMASK * 8)(%rdi),%rsi    /* get set from sc_mask */
        movl    $3,%edi                         /* how = SIG_SETMASK */
        movl    $SYS_sigprocmask,%eax
98:     syscall
        PINSYSCALL(SYS_sigprocmask, 98b)
2:      movl    %r8d,%eax

        leaq     __jmpxor(%rip),%rcx
        movq    (_JB_RSP * 8)(%r12),%r11
        xorq    (1*8)(%rcx),%r11
        movq    %r11,%rsp
        movq    (_JB_PC  * 8)(%r12),%r11
        xorq    (2*8)(%rcx),%r11
        movq    %r11,0(%rsp)
        RETGUARD_SETUP(siglongjmp, r10)
        ldmxcsr (_JB_MXCSR * 8)(%r12)
        fldcw   (_JB_MXCSR * 8 + 4)(%r12)
        movq    (_JB_RBX * 8)(%r12),%rbx
        movq    (_JB_RBP * 8)(%r12),%r11
        xorq    (0*8)(%rcx),%r11
        movq    %r11,%rbp
        movq    (_JB_R13 * 8)(%r12),%r13
        movq    (_JB_R14 * 8)(%r12),%r14
        movq    (_JB_R15 * 8)(%r12),%r15
        movq    (_JB_R12 * 8)(%r12),%r12
        xorq    %rcx,%rcx

        testl   %eax,%eax
        jnz     1f
        incl    %eax
1:      RETGUARD_CHECK(siglongjmp, r10)
        ret
END(siglongjmp)