1/* $NetBSD: exec_image.S,v 1.2 2001/09/27 14:08:28 minoura Exp $ */ 2 3/* 4 * Copyright (c) 2001 Minoura Makoto. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include <machine/asm.h> 29 30#ifndef LASTADDR 31#define LASTADDR (0x00ed0008) 32#endif 33 34 .text 35 .even 36 37ENTRY_NOPROFILE(exec_image) 38|| void exec_image(loaded,executed,entry,size,bootdev,boothowto) 39|| unsigned int loaded; 40|| unsigned int executed; 41|| unsigned int entry; 42|| int size; 43|| int bootdev; 44|| int boothowto; 45 addl #4,%sp | throw away the return address 46 moveml %sp@+,%a4-%a6 47 moveml %sp@+,%d5-%d7 48 49/* copy the trampoline to the last physical page. */ 50 moval LASTADDR,%sp | tmpstack from end of physmem 51 lea %sp@(-4096),%a3 | use last phys page as tramp 52 53 movl #(end_trampoline-trampoline),%sp@- 54 pea %pc@(trampoline) 55 pea %a3@ 56 jbsr _C_LABEL(memcpy) | memcpy() is still alive 57 lea %sp@(12),%sp 58 59 jmp %a3@ | jump to tramp 60 61ASENTRY_NOPROFILE(trampoline) 62|| %a4: loaded 63|| %a5: executed 64|| %a6: entry 65|| %d5: size 66|| %d6: bootdev 67|| %d7: boothowto 68 movl %d5,%sp@- | push last arg (esym) 69 movel LASTADDR,%sp@- | second arg (physsize) 70 pea %a5@ | first arg (firstpa) 71 72 cmpl %a4,%a5 | if (l == x) 73 beq L1 | copy not required 74 75/* this may overwrite the trap vectors; disable interrupt. */ 76 oriw #0x2700,%sr 77 78L0: movb %a4@+,%a5@+ | copy kern to x 79 subql #1,%d5 80 bne L0 81 82L1: 83 movq #0,%d0 | reg arg (unused) 84 movq #0,%d1 | reg arg (unused) 85 movq #0,%d2 | reg arg (unused) 86 movq #0,%d3 | reg arg (unused) 87 movq #0,%d4 | reg arg (unused) 88 movq #0,%d5 | reg arg (unused) 89 | bootdev(%d6) is already set 90 | boothowto(%d7) is already set 91 moval %a6,%a0 | entry 92 moval %d0,%a1 | reg arg (unused) 93 moval %d0,%a2 | reg arg (unused) 94 moval %d0,%a3 | reg arg (unused) 95 moval %d0,%a4 | reg arg (unused) 96 moval %d0,%a5 | reg arg (unused) 97 moval %d0,%a6 | reg arg (unused) 98 movec %a1,%vbr | clear vbr 99 100 jsr %a0@ | here we go! 101 102 /* NOTREACHED */ 103end_trampoline: 104