srt0.s revision 1.1
1 1.1 dbj /* $NetBSD: srt0.s,v 1.1 1998/06/09 07:53:06 dbj Exp $ */ 2 1.1 dbj /* 3 1.1 dbj * Copyright (c) 1994 Rolf Grossmann 4 1.1 dbj * All rights reserved. 5 1.1 dbj * 6 1.1 dbj * Redistribution and use in source and binary forms, with or without 7 1.1 dbj * modification, are permitted provided that the following conditions 8 1.1 dbj * are met: 9 1.1 dbj * 1. Redistributions of source code must retain the above copyright 10 1.1 dbj * notice, this list of conditions and the following disclaimer. 11 1.1 dbj * 2. Redistributions in binary form must reproduce the above copyright 12 1.1 dbj * notice, this list of conditions and the following disclaimer in the 13 1.1 dbj * documentation and/or other materials provided with the distribution. 14 1.1 dbj * 3. All advertising materials mentioning features or use of this software 15 1.1 dbj * must display the following acknowledgement: 16 1.1 dbj * This product includes software developed by Rolf Grossmann. 17 1.1 dbj * 4. The name of the author may not be used to endorse or promote products 18 1.1 dbj * derived from this software without specific prior written permission 19 1.1 dbj * 20 1.1 dbj * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 1.1 dbj * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 1.1 dbj * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 1.1 dbj * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 1.1 dbj * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 1.1 dbj * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 1.1 dbj * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 1.1 dbj * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 1.1 dbj * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 1.1 dbj * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 1.1 dbj */ 31 1.1 dbj 32 1.1 dbj /* 33 1.1 dbj * Startup code for standalone system 34 1.1 dbj */ 35 1.1 dbj 36 1.1 dbj .globl _mg | struct prominfo 37 1.1 dbj .globl _end 38 1.1 dbj .globl _edata 39 1.1 dbj .globl _main 40 1.1 dbj 41 1.1 dbj .text 42 1.1 dbj .globl start 43 1.1 dbj 44 1.1 dbj start: 45 1.1 dbj || clear bss (this shouldn't hurt us i.e. cause an exception) 46 1.1 dbj movel #_edata,a2 | start of BSS 47 1.1 dbj movel #_end,a3 | end 48 1.1 dbj Lclr: 49 1.1 dbj clrb a2@+ | clear BSS 50 1.1 dbj cmpl a2,a3 | done? 51 1.1 dbj bne Lclr | no, keep going 52 1.1 dbj 53 1.1 dbj movl #0x0808,d0 54 1.1 dbj movc d0,cacr | clear and disable on-chip cache(s) 55 1.1 dbj 56 1.1 dbj || catch exceptions myself 57 1.1 dbj movec vbr, a3 58 1.1 dbj movel a3, save_vbr | save register for restoration 59 1.1 dbj lea vectbl, a4 60 1.1 dbj movel a3@(4),a4@(4) | copy mg, just for sure 61 1.1 dbj movel a3@(180),a4@(180) | copy vector for trap #13 62 1.1 dbj movel a3@(124),a4@(124) | copy vector for int 7 63 1.1 dbj movec a4,vbr | use the new table 64 1.1 dbj 65 1.1 dbj || save mg as pi 66 1.1 dbj movel a3@(4),_mg 67 1.1 dbj 68 1.1 dbj || make sure we disallow interrupts 69 1.1 dbj movew #0x2600,sr 70 1.1 dbj 71 1.1 dbj || let's go 72 1.1 dbj movel sp@(4),sp@- | copy the argument we got 73 1.1 dbj jsr _main | call C 74 1.1 dbj addql #4,sp 75 1.1 dbj 76 1.1 dbj || restore prom vectors 77 1.1 dbj movel save_vbr, a0 78 1.1 dbj movec a0,vbr 79 1.1 dbj 80 1.1 dbj || return kernel start address (still in d0) 81 1.1 dbj rts 82 1.1 dbj 83 1.1 dbj .globl __halt 84 1.1 dbj __halt: 85 1.1 dbj movel save_vbr, a0 86 1.1 dbj movec a0,vbr | restore prom vbr 87 1.1 dbj hloop: 88 1.1 dbj movel #halt, d0 89 1.1 dbj trap #13 | halt the system 90 1.1 dbj bra hloop | and don't allow continuation 91 1.1 dbj 92 1.1 dbj .globl _trap 93 1.1 dbj trap: 94 1.1 dbj moveml d0-d7/a0-a7,sp@- | save all registers 95 1.1 dbj 96 1.1 dbj movel sp,sp@- | push pointer to registers 97 1.1 dbj jsr _trap | call C to handle things (dump regs) 98 1.1 dbj addql #4,sp 99 1.1 dbj tstl d0 100 1.1 dbj jeq Lstop 101 1.1 dbj moveml sp@+,d0-d7/a0-a7 102 1.1 dbj rte 103 1.1 dbj Lstop: 104 1.1 dbj bra Lstop | don't move 105 1.1 dbj 106 1.1 dbj .data 107 1.1 dbj save_vbr: 108 1.1 dbj .long 0 109 1.1 dbj halt: 110 1.1 dbj .asciz "-h" 111 1.1 dbj vectbl: | copy of vector table (can't use .fill) 112 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 113 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 114 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 115 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 116 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 117 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 118 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 119 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 120 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 121 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 122 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 123 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 124 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 125 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 126 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 127 1.1 dbj .long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap 128
Indexes created Tue Oct 14 15:09:51 GMT 2025