FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/swtch.S

     /*      $NetBSD: cpuswitch.S,v 1.41 2003/11/15 08:44:18 scw Exp $       */
     
     /*-
      * Copyright 2003 Wasabi Systems, Inc.
      * All rights reserved.
      *
      * Written by Steve C. Woodford 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.
     */
    /*-
     * Copyright (c) 1994-1998 Mark Brinicombe.
     * Copyright (c) 1994 Brini.
     * All rights reserved.
     *
     * This code is derived from software written for Brini by Mark Brinicombe
     *
     * 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 by Brini.
     * 4. The name of the company nor the name of the author may be used to
     *    endorse or promote products derived from this software without specific
     *    prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI 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.
     *
     * RiscBSD kernel project
     *
     * cpuswitch.S
     *
     * cpu switching functions
     *
     * Created      : 15/10/94
     *
     */
    
    #include "assym.inc"
    
    #include <machine/asm.h>
    #include <machine/asmacros.h>
    #include <machine/armreg.h>
    #include <machine/vfp.h>
    
    __FBSDID("$FreeBSD$");
    
    #ifdef VFP
            .fpu vfp        /* allow VFP instructions */
    #endif
    
    ENTRY(savectx)
            stmfd   sp!, {lr}
            sub     sp, sp, #4
    
            /* Store all the registers in the thread's pcb */
            add     r3, r0, #(PCB_R4)
           stmia   r3, {r4-r12, sp, lr, pc}
   #ifdef VFP
           fmrx    r2, fpexc               /* If the VFP is enabled */
           tst     r2, #(VFPEXC_EN)        /* the current thread has */
           movne   r1, #1                  /* used it, so go save */
           addne   r0, r0, #(PCB_VFPSTATE) /* the state into the PCB */
           blne    _C_LABEL(vfp_store)     /* and disable the VFP. */
   #endif
           add     sp, sp, #4;
           ldmfd   sp!, {pc}
   END(savectx)
   
   ENTRY(fork_trampoline)
           STOP_UNWINDING  /* EABI: Don't unwind beyond the thread enty point. */
           mov     fp, #0  /* OABI: Stack traceback via fp stops here. */
           mov     r2, sp
           mov     r1, r5
           mov     r0, r4
           ldr     lr, =swi_exit           /* Go finish forking, then return */
           b       _C_LABEL(fork_exit)     /* to userland via swi_exit code. */
   END(fork_trampoline)
   

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