sys/arch/x68k/stand/common/exec_image.S

   1 /*      $NetBSD: exec_image.S,v 1.1 2001/09/27 10:14:50 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
  37 ENTRY_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
  61 ASENTRY_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
  78 L0:     movb            %a4@+,%a5@+             | copy kern to x
  79         subql           #1,%d5
  80         bne             L0
  81
  82 L1:
  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 */
 103 end_trampoline: