1/* $NetBSD: srt0.S,v 1.5 2017/05/22 17:00:19 ragge 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 /* All bugs are subject to removal without further notice */ 28 29#include "../include/asm.h" 30 31/* 32 * Auto-moving startup code for standalone programs. Can be loaded 33 * (almost) anywhere in memory but moves itself to the position 34 * it is linked for. Must be started at first position, recommended 35 * is phys addr 0 (boot loads programs at 0, but starts them at the 36 * position set in a.out header. 37 */ 38 39 .globl nisse # pass -e nisse to ld gives OK start addr 40 .set nisse,0 41 42ALTENTRY(start) 43 nop;nop; 44 movl $_C_LABEL(start), %sp # Probably safe place for stack 45 pushr $0x1fff # save for later usage 46 47 subl3 $_C_LABEL(start), $_C_LABEL(edata), %r0 48 movab _C_LABEL(start), %r1 # get where we are 49 movl $_C_LABEL(start), %r3 # get where we want to be 50 cmpl %r1,%r3 # are we where we want to be? 51 beql relocated # already relocated, skip copy 52 movc3 %r0,(%r1),(%r3) # copy 53 subl3 $_C_LABEL(edata), $_C_LABEL(end), %r2 54 movc5 $0,(%r3),$0,%r2,(%r3) # Zero bss 55 56 movpsl -(%sp) 57 pushl $relocated 58 rei 59relocated: # now relocation is done !!! 60 movl %sp,_C_LABEL(bootregs) # *bootregs 61 calls $0, _C_LABEL(Xmain) # Were here! 62 halt # no return 63 64ENTRY(machdep_start, 0) 65 calls $0,_C_LABEL(niclose) # Evil hack to shutdown DEBNA. 66 mtpr $0x1f,$0x12 # Block all interrupts 67 mtpr $0,$0x18 # stop real time interrupt clock 68 movl 4(%ap), %r6 69 movl 20(%ap), %r9 # end of symbol table 70 pushl 8(%ap) # number of symbols 71 pushl 16(%ap) # start of symbols 72 movab _C_LABEL(bootrpb),%r10 # get RPB address 73 pushl %r10 # argument for new boot 74 ashl $9,76(%r10),%r8 # memory size (COMPAT) 75 movl $3,%r11 # ask boot (COMPAT) 76 clrl %r10 # no boot dev (COMPAT) 77 78 calls $3,(%r6) 79 halt 80