2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
120 lines
3 KiB
ArmAsm
120 lines
3 KiB
ArmAsm
/* $NetBSD: bzero.S,v 1.2 2003/10/06 05:30:21 matt Exp $ */
|
|
|
|
/* $OpenBSD: bzero.S,v 1.3 2001/06/04 23:14:02 mickey Exp $ */
|
|
|
|
/*
|
|
* (c) Copyright 1988 HEWLETT-PACKARD COMPANY
|
|
*
|
|
* To anyone who acknowledges that this file is provided "AS IS"
|
|
* without any express or implied warranty:
|
|
* permission to use, copy, modify, and distribute this file
|
|
* for any purpose is hereby granted without fee, provided that
|
|
* the above copyright notice and this notice appears in all
|
|
* copies, and that the name of Hewlett-Packard Company not be
|
|
* used in advertising or publicity pertaining to distribution
|
|
* of the software without specific, written prior permission.
|
|
* Hewlett-Packard Company makes no representations about the
|
|
* suitability of this software for any purpose.
|
|
*/
|
|
/*
|
|
* Copyright (c) 1990,1994 The University of Utah and
|
|
* the Computer Systems Laboratory (CSL). All rights reserved.
|
|
*
|
|
* THE UNIVERSITY OF UTAH AND CSL PROVIDE THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION, AND DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM ITS USE.
|
|
*
|
|
* CSL requests users of this software to return to csl-dist@cs.utah.edu any
|
|
* improvements that they make and grant CSL redistribution rights.
|
|
*
|
|
* Utah $Hdr: bzero.s 1.9 94/12/14$
|
|
* Author: Bob Wheeler, University of Utah CSL
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
#ifdef SYSLIBC_SCCS
|
|
.text
|
|
.asciz "$OpenBSD: bzero.S,v 1.3 2001/06/04 23:14:02 mickey Exp $"
|
|
.align 4
|
|
#endif
|
|
|
|
/*
|
|
* void
|
|
* bzero(dst, count)
|
|
* void *dst;
|
|
* size_t count;
|
|
*/
|
|
LEAF_ENTRY(bzero)
|
|
comb,>=,n %r0,%arg1,$bzero_exit
|
|
|
|
/*
|
|
* If we need to clear less than a word do it a byte at a time
|
|
*/
|
|
|
|
comib,>>,n 4,%arg1,$bzero_bytes
|
|
|
|
/*
|
|
* Since we are only clearing memory the alignment restrictions
|
|
* are simplified. Figure out how many "extra" bytes we need to
|
|
* store with stbys.
|
|
*/
|
|
|
|
extru %arg0,31,2,%t1
|
|
add %arg1,%t1,%arg1
|
|
|
|
/*
|
|
* We will zero the destination in blocks of 16 bytes as long as we
|
|
* can and then we'll go to the 4 byte moves.
|
|
*/
|
|
|
|
comib,>>= 15, %arg1, $bzero_word
|
|
addi -16, %arg1, %arg1
|
|
|
|
$bzero_loop_16:
|
|
stbys,b,m %r0,4(%arg0)
|
|
stwm %r0,4(%arg0)
|
|
stwm %r0,4(%arg0)
|
|
stwm %r0,4(%arg0)
|
|
comib,<< 15, %arg1, $bzero_loop_16
|
|
addi -16, %arg1, %arg1
|
|
|
|
/*
|
|
* see if there is anything left that needs to be zeroed in a word
|
|
* move. Since the count was decremented by 16, add 12 to test if
|
|
* there are any full word moves left to do.
|
|
*/
|
|
|
|
$bzero_word:
|
|
addib,<,n 12,%arg1,$bzero_cleanup
|
|
|
|
$bzero_loop_4:
|
|
addib,>= -4,%arg1,$bzero_loop_4
|
|
stbys,b,m %r0,4(%arg0)
|
|
|
|
/*
|
|
* zero the last bytes that may be unaligned on a word boundary
|
|
*/
|
|
|
|
$bzero_cleanup:
|
|
addib,=,n 4,%arg1,$bzero_exit
|
|
add %arg0,%arg1,%arg0
|
|
b $bzero_exit
|
|
stbys,e %r0,0(%arg0)
|
|
b,n $bzero_exit
|
|
|
|
|
|
/*
|
|
* zero by bytes
|
|
*/
|
|
|
|
$bzero_bytes:
|
|
addib,> -1,%arg1,$bzero_bytes
|
|
stbs,ma %r0,1(%arg0)
|
|
|
|
$bzero_exit:
|
|
bv,n %r0(%rp)
|
|
EXIT(bzero)
|
|
|
|
.end
|