srt0.s revision 1.1
1 /* $NetBSD: srt0.s,v 1.1 1998/06/09 07:53:06 dbj Exp $ */ 2 /* 3 * Copyright (c) 1994 Rolf Grossmann 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 by Rolf Grossmann. 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 /* 33 * Startup code for standalone system 34 */ 35 36 .globl _mg | struct prominfo 37 .globl _end 38 .globl _edata 39 .globl _main 40 41 .text 42 .globl start 43 44 start: 45 || clear bss (this shouldn't hurt us i.e. cause an exception) 46 movel #_edata,a2 | start of BSS 47 movel #_end,a3 | end 48 Lclr: 49 clrb a2@+ | clear BSS 50 cmpl a2,a3 | done? 51 bne Lclr | no, keep going 52 53 movl #0x0808,d0 54 movc d0,cacr | clear and disable on-chip cache(s) 55 56 || catch exceptions myself 57 movec vbr, a3 58 movel a3, save_vbr | save register for restoration 59 lea vectbl, a4 60 movel a3@(4),a4@(4) | copy mg, just for sure 61 movel a3@(180),a4@(180) | copy vector for trap #13 62 movel a3@(124),a4@(124) | copy vector for int 7 63 movec a4,vbr | use the new table 64 65 || save mg as pi 66 movel a3@(4),_mg 67 68 || make sure we disallow interrupts 69 movew #0x2600,sr 70 71 || let's go 72 movel sp@(4),sp@- | copy the argument we got 73 jsr _main | call C 74 addql #4,sp 75 76 || restore prom vectors 77 movel save_vbr, a0 78 movec a0,vbr 79 80 || return kernel start address (still in d0) 81 rts 82 83 .globl __halt 84 __halt: 85 movel save_vbr, a0 86 movec a0,vbr | restore prom vbr 87 hloop: 88 movel #halt, d0 89 trap #13 | halt the system 90 bra hloop | and don't allow continuation 91 92 .globl _trap 93 trap: 94 moveml d0-d7/a0-a7,sp@- | save all registers 95 96 movel sp,sp@- | push pointer to registers 97 jsr _trap | call C to handle things (dump regs) 98 addql #4,sp 99 tstl d0 100 jeq Lstop 101 moveml sp@+,d0-d7/a0-a7 102 rte 103 Lstop: 104 bra Lstop | don't move 105 106 .data 107 save_vbr: 108 .long 0 109 halt: 110 .asciz "-h" 111 vectbl: | copy of vector table (can't use .fill) 112 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 113 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 114 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 115 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 116 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 117 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 118 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 119 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 120 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 121 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 122 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 123 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 124 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 125 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 126 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 127 .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 128
Indexes created Mon Oct 13 21:09:55 GMT 2025