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
97 lines
3.4 KiB
ArmAsm
97 lines
3.4 KiB
ArmAsm
/* $NetBSD: bzero.S,v 1.10 2009/12/14 02:53:52 matt Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <mips/asm.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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RCSID("from: @(#)bzero.s 8.1 (Berkeley) 6/4/93")
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#else
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RCSID("$NetBSD: bzero.S,v 1.10 2009/12/14 02:53:52 matt Exp $")
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#endif
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#endif /* LIBC_SCCS and not lint */
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#define _LOCORE /* XXX not really, just assembly-code source */
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#include <machine/endian.h>
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/* bzero(s1, n) */
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LEAF(bzero)
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.set noreorder
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blt a1, 3*SZREG, smallclr # small amount to clear?
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PTR_SUBU a3, zero, a0 # compute # bytes to word align address
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and a3, a3, SZREG-1
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beq a3, zero, 1f # skip if word aligned
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#if SZREG == 4
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PTR_SUBU a1, a1, a3 # subtract from remaining count
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SWHI zero, 0(a0) # clear 1, 2, or 3 bytes to align
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PTR_ADDU a0, a0, a3
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#endif
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#if SZREG == 8
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PTR_SUBU a1, a1, a3 # subtract from remaining count
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PTR_ADDU a0, a0, a3 # align dst to next word
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sll a3, a3, 3 # bits to bytes
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li a2, -1 # make a mask
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#if _BYTE_ORDER == _BIG_ENDIAN
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REG_SRLV a2, a2, a3 # we want to keep the MSB bytes
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#endif
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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REG_SLLV a2, a2, a3 # we want to keep the LSB bytes
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#endif
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nor a2, zero, a2 # complement the mask
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REG_L v0, -SZREG(a0) # load the word to partially clear
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and v0, v0, a2 # clear the bytes
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REG_S v0, -SZREG(a0) # store it back
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#endif
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1:
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and v0, a1, SZREG-1 # compute number of words left
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PTR_SUBU a3, a1, v0
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move a1, v0
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PTR_ADDU a3, a3, a0 # compute ending address
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2:
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PTR_ADDU a0, a0, SZREG # clear words
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bne a0, a3, 2b # unrolling loop doesnt help
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REG_S zero, -SZREG(a0) # since we are limited by memory speed
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smallclr:
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ble a1, zero, 2f
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PTR_ADDU a3, a1, a0 # compute ending address
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1:
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PTR_ADDU a0, a0, 1 # clear bytes
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bne a0, a3, 1b
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sb zero, -1(a0)
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2:
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j ra
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nop
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END(bzero)
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