srt0.S revision 1.3
11.3Sthorpej/* $NetBSD: srt0.S,v 1.3 2002/11/05 06:16:21 thorpej 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 * 3. All advertising materials mentioning features or use of this software 151.1Smatt * must display the following acknowledgement: 161.1Smatt * This product includes software developed at Ludd, University of Lule}. 171.1Smatt * 4. The name of the author may not be used to endorse or promote products 181.1Smatt * derived from this software without specific prior written permission 191.1Smatt * 201.1Smatt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 211.1Smatt * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 221.1Smatt * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 231.1Smatt * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 241.1Smatt * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 251.1Smatt * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 261.1Smatt * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 271.1Smatt * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 281.1Smatt * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 291.1Smatt * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 301.1Smatt */ 311.1Smatt 321.1Smatt /* All bugs are subject to removal without further notice */ 331.1Smatt 341.1Smatt#include "../include/asm.h" 351.1Smatt 361.1Smatt/* 371.1Smatt * Auto-moving startup code for standalone programs. Can be loaded 381.1Smatt * (almost) anywhere in memory but moves itself to the position 391.1Smatt * it is linked for. Must be started at first position, recommended 401.1Smatt * is phys addr 0 (boot loads programs at 0, but starts them at the 411.1Smatt * position set in a.out header. 421.1Smatt */ 431.1Smatt 441.1Smatt .globl nisse # pass -e nisse to ld gives OK start addr 451.1Smatt .set nisse,0 461.1Smatt 471.1SmattALTENTRY(start) 481.3Sthorpej nop; nop 491.1Smatt 501.1Smatt subl3 $_C_LABEL(start), $_C_LABEL(edata), %r0 511.1Smatt movab _C_LABEL(start), %r1 # get where we are 521.1Smatt movl $_C_LABEL(start), %r3 # get where we want to be 531.1Smatt cmpl %r1,%r3 # are we where we want to be? 541.3Sthorpej beql 1f # already relocated, skip copy 551.1Smatt movc3 %r0,(%r1),(%r3) # copy 561.3Sthorpej1: 571.1Smatt subl3 $_C_LABEL(edata), $_C_LABEL(end), %r2 581.1Smatt movc5 $0,(%r3),$0,%r2,(%r3) # Zero bss 591.3Sthorpej 601.3Sthorpej movl $_C_LABEL(start), %sp # set up boot stack 611.3Sthorpej pushr $0x1fff # save for later usage 621.1Smatt 631.1Smatt movpsl -(%sp) 641.1Smatt pushl $relocated 651.1Smatt rei 661.1Smattrelocated: # now relocation is done !!! 671.1Smatt movl %sp,_C_LABEL(bootregs) # *bootregs 681.1Smatt calls $0, _C_LABEL(Xmain) # Were here! 691.1Smatt halt # no return 701.1Smatt 711.1SmattENTRY(machdep_start, 0) 721.1Smatt calls $0,_C_LABEL(niclose) # Evil hack to shutdown DEBNA. 731.1Smatt mtpr $0x1f,$0x12 # Block all interrupts 741.1Smatt mtpr $0,$0x18 # stop real time interrupt clock 751.1Smatt movl 4(%ap), %r6 761.1Smatt movl 20(%ap), %r9 # end of symbol table 771.1Smatt pushl 8(%ap) # number of symbols 781.2Smatt pushl 16(%ap) # start of symbols 791.1Smatt movab _C_LABEL(bootrpb),%r10 # get RPB address 801.1Smatt pushl %r10 # argument for new boot 811.1Smatt ashl $9,76(%r10),%r8 # memory size (COMPAT) 821.1Smatt movl $3,%r11 # ask boot (COMPAT) 831.1Smatt clrl %r10 # no boot dev (COMPAT) 841.1Smatt 851.1Smatt calls $3,(%r6) 861.1Smatt halt 87