104 lines
3.1 KiB
ArmAsm
104 lines
3.1 KiB
ArmAsm
/* $NetBSD: exec_image.S,v 1.2 2001/09/27 14:08:28 minoura Exp $ */
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/*
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* Copyright (c) 2001 Minoura Makoto.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#ifndef LASTADDR
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#define LASTADDR (0x00ed0008)
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#endif
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.text
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.even
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ENTRY_NOPROFILE(exec_image)
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|| void exec_image(loaded,executed,entry,size,bootdev,boothowto)
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|| unsigned int loaded;
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|| unsigned int executed;
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|| unsigned int entry;
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|| int size;
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|| int bootdev;
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|| int boothowto;
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addl #4,%sp | throw away the return address
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moveml %sp@+,%a4-%a6
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moveml %sp@+,%d5-%d7
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/* copy the trampoline to the last physical page. */
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moval LASTADDR,%sp | tmpstack from end of physmem
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lea %sp@(-4096),%a3 | use last phys page as tramp
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movl #(end_trampoline-trampoline),%sp@-
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pea %pc@(trampoline)
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pea %a3@
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jbsr _C_LABEL(memcpy) | memcpy() is still alive
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lea %sp@(12),%sp
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jmp %a3@ | jump to tramp
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ASENTRY_NOPROFILE(trampoline)
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|| %a4: loaded
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|| %a5: executed
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|| %a6: entry
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|| %d5: size
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|| %d6: bootdev
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|| %d7: boothowto
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movl %d5,%sp@- | push last arg (esym)
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movel LASTADDR,%sp@- | second arg (physsize)
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pea %a5@ | first arg (firstpa)
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cmpl %a4,%a5 | if (l == x)
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beq L1 | copy not required
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/* this may overwrite the trap vectors; disable interrupt. */
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oriw #0x2700,%sr
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L0: movb %a4@+,%a5@+ | copy kern to x
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subql #1,%d5
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bne L0
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L1:
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movq #0,%d0 | reg arg (unused)
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movq #0,%d1 | reg arg (unused)
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movq #0,%d2 | reg arg (unused)
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movq #0,%d3 | reg arg (unused)
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movq #0,%d4 | reg arg (unused)
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movq #0,%d5 | reg arg (unused)
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| bootdev(%d6) is already set
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| boothowto(%d7) is already set
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moval %a6,%a0 | entry
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moval %d0,%a1 | reg arg (unused)
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moval %d0,%a2 | reg arg (unused)
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moval %d0,%a3 | reg arg (unused)
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moval %d0,%a4 | reg arg (unused)
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moval %d0,%a5 | reg arg (unused)
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moval %d0,%a6 | reg arg (unused)
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movec %a1,%vbr | clear vbr
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jsr %a0@ | here we go!
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/* NOTREACHED */
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end_trampoline:
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