/*      $NetBSD: rmheader.S,v 1.4 2005/12/11 12:16:08 christos Exp $    */

/*-
 * Copyright (c) 2001 Ben Harris
 * All rights reserved.
 *
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/*
 * Relocatable module header for boot32.
 */

#include <riscoscalls.h>

rmbase:
        b       rmstart                 /* Start code */
        .word   0                       /* Initialisation code */
        .word   0                       /* Finalisation code */
        .word   0                       /* Service call handler */
        .word   rmtitle - rmbase        /* Title string */
        .word   rmhelp - rmbase         /* Help string */
        .word   rmcmdtbl - rmbase       /* Help and command keyword table */
        .word   0                       /* SWI chunk base number */
        .word   0                       /* SWI handler code offset */
        .word   0                       /* SWI decoding table offset */
        .word   0                       /* SWI decoding code offset */
        .word   0                       /* Messages filename offset */
        .word   flags - rmbase          /* Module flags extension offset */

rmtitle:
        .asciz  "boot32"
        .align
flags:
        .word   1                       /* 32 bit compatible */

rmstart:
        /*
         * This entry point is called when we're started up as an application,
         * so we're allowed to use application workspace.  This is good,
         * because most of our code is linked to run at 0x8000.
         */
        mov     r0, #0x8000
        adr     r1, rmbase
        ldr     r2, Lsize
Lcopyloop:
        ldr     r3, [r1], #4
        str     r3, [r0], #4
        subs    r2, r2, #4
        bgt     Lcopyloop
        mov     r0, #0x8000
        mov     r1, #128*1024
LDsync_loop:
        ldrb    r3, [r0], #1
        subs    r1, r1, #1
        bgt     LDsync_loop
        ldr     r0, Lstart
        mov     pc, r0

        /*
         * The size of the code/data to be moved is not `end - rmbase' but
         * `__bss_start__ - rmbase' for the module is loaded into RISC OS
         * based on the filesize where as NetBSD doesn't have to include all
         * the bss space into the file itself. In some odd cases the
         * relocatable module area can be smaller than the module + bss and
         * thus bomb out.
         */
Lsize:
        .word   __bss_start__ - rmbase
Lstart:
        .word   _start

rmcmdtbl:
        .asciz  "boot32"                /* Command text */
        .align
        .word   rmcmd_boot32 - rmbase   /* Command code */
        .byte   0x00                    /* Min 0 parameters */
        .byte   0x00                    /* No GSTransed parameters */
        .byte   0xff                    /* Max 255 parameters */
        .byte   0x00                    /* Normal command */
        .word   0                       /* No syntax message */
        .word   0                       /* No help message */

rmcmd_boot32:
        /* We're called with r0 -> command tail. */
        stmfd   r13!, {r14}
        mov     r2, r0
        mov     r0, #2
        adr     r1, rmtitle
        swi     XOS_Module
        ldmfd   r13!, {pc}