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rmheader.S revision 1.3 
      1 /*	$NetBSD: rmheader.S,v 1.3 2003/11/18 22:46:33 gavan Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 Ben Harris
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 /*
     31  * Relocatable module header for boot32.
     32  */
     33 
     34 #include <riscoscalls.h>
     35 
     36 rmbase:
     37 	b	rmstart			/* Start code */
     38 	.word	0			/* Initialisation code */
     39 	.word	0			/* Finalisation code */
     40 	.word	0			/* Service call handler */
     41 	.word	rmtitle - rmbase	/* Title string */
     42 	.word	rmhelp - rmbase		/* Help string */
     43 	.word	rmcmdtbl - rmbase	/* Help and command keyword table */
     44 	.word	0			/* SWI chunk base number */
     45 	.word	0			/* SWI handler code offset */
     46 	.word	0			/* SWI decoding table offset */
     47 	.word	0			/* SWI decoding code offset */
     48 	.word	0			/* Messages filename offset */
     49 	.word	flags - rmbase		/* Module flags extension offset */
     50 
     51 rmtitle:
     52 	.asciz	"boot32"
     53 	.align
     54 flags:
     55 	.word	1			/* 32 bit compatible */
     56 
     57 rmstart:
     58 	/*
     59 	 * This entry point is called when we're started up as an application,
     60 	 * so we're allowed to use application workspace.  This is good,
     61 	 * because most of our code is linked to run at 0x8000.
     62 	 */
     63 	mov	r0, #0x8000
     64 	adr	r1, rmbase
     65 	ldr	r2, Lsize
     66 Lcopyloop:
     67 	ldr	r3, [r1], #4
     68 	str	r3, [r0], #4
     69 	subs	r2, r2, #4
     70 	bgt	Lcopyloop
     71 	mov	r0, #0x8000
     72 	mov	r1, #128*1024
     73 LDsync_loop:
     74 	ldrb	r3, [r0], #1
     75 	subs	r1, r1, #1
     76 	bgt	LDsync_loop
     77 	ldr	r0, Lstart
     78 	mov	pc, r0
     79 
     80 	/*
     81 	 * The size of the code/data to be moved is not `end - rmbase' but
     82 	 * `__bss_start__ - rmbase' for the module is loaded into RISC OS
     83 	 * based on the filesize where as NetBSD doesn't have to include all
     84 	 * the bss space into the file itself. In some odd cases the
     85 	 * relocatable module area can be smaller than the module + bss and
     86 	 * thus bomb out.
     87 	 */
     88 Lsize:
     89 	.word	__bss_start__ - rmbase
     90 Lstart:
     91 	.word	_start
     92 
     93 rmcmdtbl:
     94 	.asciz	"boot32"		/* Command text */
     95 	.align
     96 	.word	rmcmd_boot32 - rmbase	/* Command code */
     97 	.byte	0x00			/* Min 0 parameters */
     98 	.byte	0x00			/* No GSTransed parameters */
     99 	.byte	0xff			/* Max 255 parameters */
    100 	.byte	0x00			/* Normal command */
    101 	.word	0			/* No syntax message */
    102 	.word	0			/* No help message */
    103 
    104 rmcmd_boot32:
    105 	/* We're called with r0 -> command tail. */
    106 	stmfd	r13!, {r14}
    107 	mov	r2, r0
    108 	mov	r0, #2
    109 	adr	r1, rmtitle
    110 	swi	XOS_Module
    111 	ldmfd	r13!, {pc}
    112