/*
 * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * 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 DragonFly Project 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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.
 */

#include <sys/syscall.h>
#include <machine/asmacros.h>
#include <machine/psl.h>
#include "assym.s"

        /*
         * The sysinit and sysuninit sections have to be read-write data
         * sections, not read-only data sections.
         */
        .section        set_sysinit_set, "aw"
        .section        set_sysuninit_set, "aw"

        .data
        ALIGN_DATA              /* just to be sure */

        /*
         * Normally the startup code would begin here, but this is a
         * virtual kernel so we just have a main() in platform/init.c
         */

        .text
/**********************************************************************
 *
 * Signal trampoline, copied to top of user stack
 *
 * arguments: %rdi, %rsi, %rdx, %rcx
 */
NON_GPROF_ENTRY(sigcode)
        call    *SIGF_HANDLER(%rsp)     /* call signal handler */
        lea     SIGF_UC(%rsp),%rdi      /* get ucontext_t */
        pushq   $0                      /* junk to fake return addr. */
        movq    $SYS_sigreturn,%rax
        syscall                         /* enter kernel with args */
0:      hlt                             /* trap priviliged instruction */
        jmp     0b

        ALIGN_TEXT
esigcode:

/* void reset_dbregs() */
ENTRY(reset_dbregs)
        movq    $0x200,%rax     /* the manual says that bit 10 must be set to 1 */
        movq    %rax,%dr7       /* disable all breapoints first */
        movq    $0,%rax
        movq    %rax,%dr0
        movq    %rax,%dr1
        movq    %rax,%dr2
        movq    %rax,%dr3
        movq    %rax,%dr6
        ret
END(reset_dbregs)

        .data
        .globl  szsigcode
szsigcode:
        .long   esigcode - sigcode