srt0.S revision 1.6
11.6Sragge/* $NetBSD: srt0.S,v 1.6 2018/03/19 15:37:56 ragge Exp $ */ 21.1Smatt/* 31.1Smatt * Copyright (c) 1994 Ludd, University of Lule}, Sweden. 41.1Smatt * All rights reserved. 51.1Smatt * 61.1Smatt * Redistribution and use in source and binary forms, with or without 71.1Smatt * modification, are permitted provided that the following conditions 81.1Smatt * are met: 91.1Smatt * 1. Redistributions of source code must retain the above copyright 101.1Smatt * notice, this list of conditions and the following disclaimer. 111.1Smatt * 2. Redistributions in binary form must reproduce the above copyright 121.1Smatt * notice, this list of conditions and the following disclaimer in the 131.1Smatt * documentation and/or other materials provided with the distribution. 141.1Smatt * 151.1Smatt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 161.1Smatt * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 171.1Smatt * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 181.1Smatt * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 191.1Smatt * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 201.1Smatt * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 211.1Smatt * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 221.1Smatt * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 231.1Smatt * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 241.1Smatt * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 251.1Smatt */ 261.1Smatt 271.1Smatt /* All bugs are subject to removal without further notice */ 281.1Smatt 291.1Smatt#include "../include/asm.h" 301.1Smatt 311.1Smatt/* 321.1Smatt * Auto-moving startup code for standalone programs. Can be loaded 331.1Smatt * (almost) anywhere in memory but moves itself to the position 341.1Smatt * it is linked for. Must be started at first position, recommended 351.1Smatt * is phys addr 0 (boot loads programs at 0, but starts them at the 361.1Smatt * position set in a.out header. 371.1Smatt */ 381.1Smatt 391.1Smatt .globl nisse # pass -e nisse to ld gives OK start addr 401.1Smatt .set nisse,0 411.1Smatt 421.1SmattALTENTRY(start) 431.4Sragge nop;nop; 441.4Sragge movl $_C_LABEL(start), %sp # Probably safe place for stack 451.4Sragge pushr $0x1fff # save for later usage 461.1Smatt 471.1Smatt subl3 $_C_LABEL(start), $_C_LABEL(edata), %r0 481.1Smatt movab _C_LABEL(start), %r1 # get where we are 491.1Smatt movl $_C_LABEL(start), %r3 # get where we want to be 501.1Smatt cmpl %r1,%r3 # are we where we want to be? 511.4Sragge beql relocated # already relocated, skip copy 521.6Sragge1: movb (%r1)+,(%r3)+ # copy 531.6Sragge sobgtr %r0,1b 541.6Sragge 551.1Smatt subl3 $_C_LABEL(edata), $_C_LABEL(end), %r2 561.1Smatt movc5 $0,(%r3),$0,%r2,(%r3) # Zero bss 571.1Smatt 581.1Smatt movpsl -(%sp) 591.1Smatt pushl $relocated 601.1Smatt rei 611.1Smattrelocated: # now relocation is done !!! 621.1Smatt movl %sp,_C_LABEL(bootregs) # *bootregs 631.1Smatt calls $0, _C_LABEL(Xmain) # Were here! 641.1Smatt halt # no return 651.1Smatt 661.1SmattENTRY(machdep_start, 0) 671.1Smatt calls $0,_C_LABEL(niclose) # Evil hack to shutdown DEBNA. 681.1Smatt mtpr $0x1f,$0x12 # Block all interrupts 691.1Smatt mtpr $0,$0x18 # stop real time interrupt clock 701.1Smatt movl 4(%ap), %r6 711.1Smatt movl 20(%ap), %r9 # end of symbol table 721.1Smatt pushl 8(%ap) # number of symbols 731.2Smatt pushl 16(%ap) # start of symbols 741.1Smatt movab _C_LABEL(bootrpb),%r10 # get RPB address 751.1Smatt pushl %r10 # argument for new boot 761.1Smatt ashl $9,76(%r10),%r8 # memory size (COMPAT) 771.1Smatt movl $3,%r11 # ask boot (COMPAT) 781.1Smatt clrl %r10 # no boot dev (COMPAT) 791.1Smatt 801.1Smatt calls $3,(%r6) 811.1Smatt halt 82