1/* $NetBSD: srt0.S,v 1.2 2002/03/31 00:11:14 matt Exp $ */ 2/* 3 * Copyright (c) 1994 Ludd, University of Lule}, Sweden. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed at Ludd, University of Lule}. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* All bugs are subject to removal without further notice */ 33 34#include "../include/asm.h" 35 36/* 37 * Auto-moving startup code for standalone programs. Can be loaded 38 * (almost) anywhere in memory but moves itself to the position 39 * it is linked for. Must be started at first position, recommended 40 * is phys addr 0 (boot loads programs at 0, but starts them at the 41 * position set in a.out header. 42 */ 43 44 .globl nisse # pass -e nisse to ld gives OK start addr 45 .set nisse,0 46 47ALTENTRY(start) 48 nop;nop; 49 movl $_C_LABEL(start), %sp # Probably safe place for stack 50 pushr $0x1fff # save for later usage 51 52 subl3 $_C_LABEL(start), $_C_LABEL(edata), %r0 53 movab _C_LABEL(start), %r1 # get where we are 54 movl $_C_LABEL(start), %r3 # get where we want to be 55 cmpl %r1,%r3 # are we where we want to be? 56 beql relocated # already relocated, skip copy 57 movc3 %r0,(%r1),(%r3) # copy 58 subl3 $_C_LABEL(edata), $_C_LABEL(end), %r2 59 movc5 $0,(%r3),$0,%r2,(%r3) # Zero bss 60 61 movpsl -(%sp) 62 pushl $relocated 63 rei 64relocated: # now relocation is done !!! 65 movl %sp,_C_LABEL(bootregs) # *bootregs 66 calls $0, _C_LABEL(Xmain) # Were here! 67 halt # no return 68 69ENTRY(machdep_start, 0) 70 calls $0,_C_LABEL(niclose) # Evil hack to shutdown DEBNA. 71 mtpr $0x1f,$0x12 # Block all interrupts 72 mtpr $0,$0x18 # stop real time interrupt clock 73 movl 4(%ap), %r6 74 movl 20(%ap), %r9 # end of symbol table 75 pushl 8(%ap) # number of symbols 76 pushl 16(%ap) # start of symbols 77 movab _C_LABEL(bootrpb),%r10 # get RPB address 78 pushl %r10 # argument for new boot 79 ashl $9,76(%r10),%r8 # memory size (COMPAT) 80 movl $3,%r11 # ask boot (COMPAT) 81 clrl %r10 # no boot dev (COMPAT) 82 83 calls $3,(%r6) 84 halt 85