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
124 lines
3.8 KiB
ArmAsm
124 lines
3.8 KiB
ArmAsm
/* $NetBSD: bcmp.S,v 1.9 2009/12/14 01:07:42 matt Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Ralph Campbell.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <mips/asm.h>
|
|
#define _LOCORE /* XXX not really, just assembly-code source */
|
|
#include <machine/endian.h> /* LWLO/LWHI, SWLO/SWHI */
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
RCSID("from: @(#)bcmp.s 8.1 (Berkeley) 6/4/93")
|
|
#else
|
|
RCSID("$NetBSD: bcmp.S,v 1.9 2009/12/14 01:07:42 matt Exp $")
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
/* bcmp(s1, s2, n) */
|
|
|
|
|
|
LEAF(bcmp)
|
|
.set noreorder
|
|
blt a2, 16, small # is it worth any trouble?
|
|
xor v0, a0, a1 # compare low two bits of addresses
|
|
and v0, v0, 3
|
|
PTR_SUBU a3, zero, a1 # compute # bytes to word align address
|
|
bne v0, zero, unaligned # not possible to align addresses
|
|
and a3, a3, 3
|
|
|
|
beq a3, zero, 1f
|
|
PTR_SUBU a2, a2, a3 # subtract from remaining count
|
|
move v0, v1 # init v0,v1 so unmodified bytes match
|
|
LWHI v0, 0(a0) # read 1, 2, or 3 bytes
|
|
LWHI v1, 0(a1)
|
|
PTR_ADDU a1, a1, a3
|
|
bne v0, v1, nomatch
|
|
PTR_ADDU a0, a0, a3
|
|
1:
|
|
and a3, a2, ~3 # compute number of whole words left
|
|
PTR_SUBU a2, a2, a3 # which has to be >= (16-3) & ~3
|
|
PTR_ADDU a3, a3, a0 # compute ending address
|
|
2:
|
|
lw v0, 0(a0) # compare words
|
|
lw v1, 0(a1)
|
|
PTR_ADDU a0, a0, 4
|
|
bne v0, v1, nomatch
|
|
PTR_ADDU a1, a1, 4
|
|
bne a0, a3, 2b
|
|
nop
|
|
b small # finish remainder
|
|
nop
|
|
unaligned:
|
|
beq a3, zero, 2f
|
|
PTR_SUBU a2, a2, a3 # subtract from remaining count
|
|
PTR_ADDU a3, a3, a0 # compute ending address
|
|
1:
|
|
lbu v0, 0(a0) # compare bytes until a1 word aligned
|
|
lbu v1, 0(a1)
|
|
PTR_ADDU a0, a0, 1
|
|
bne v0, v1, nomatch
|
|
PTR_ADDU a1, a1, 1
|
|
bne a0, a3, 1b
|
|
nop
|
|
2:
|
|
and a3, a2, ~3 # compute number of whole words left
|
|
PTR_SUBU a2, a2, a3 # which has to be >= (16-3) & ~3
|
|
PTR_ADDU a3, a3, a0 # compute ending address
|
|
3:
|
|
LWHI v0, 0(a0) # compare words a0 unaligned, a1 aligned
|
|
LWLO v0, 3(a0)
|
|
lw v1, 0(a1)
|
|
PTR_ADDU a0, a0, 4
|
|
bne v0, v1, nomatch
|
|
PTR_ADDU a1, a1, 4
|
|
bne a0, a3, 3b
|
|
nop
|
|
small:
|
|
ble a2, zero, match
|
|
PTR_ADDU a3, a2, a0 # compute ending address
|
|
1:
|
|
lbu v0, 0(a0)
|
|
lbu v1, 0(a1)
|
|
PTR_ADDU a0, a0, 1
|
|
bne v0, v1, nomatch
|
|
PTR_ADDU a1, a1, 1
|
|
bne a0, a3, 1b
|
|
nop
|
|
match:
|
|
j ra
|
|
move v0, zero
|
|
nomatch:
|
|
j ra
|
|
li v0, 1
|
|
.set reorder
|
|
END(bcmp)
|