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851f30136d
Collapse the arch,os-specific directories into the main directory by renaming xxx/foo.c to foo_xxx.c, and so on. There are no substantial edits here, except to the Makefile. The assumption is that the Go tool will #define GOOS_darwin and GOARCH_amd64 and will make any file named something like signals_darwin.h available as signals_GOOS.h during the build. This replaces what used to be done with -I$(GOOS). There is still work to be done to make runtime build with standard tools, but this is a big step. After this we will have to write a script to generate all the generated files so they can be checked in (instead of generated during the build). R=r, iant, r, lucio.dere CC=golang-dev https://golang.org/cl/5490053
95 lines
2.7 KiB
ArmAsm
95 lines
2.7 KiB
ArmAsm
// Inferno's libkern/memset-arm.s
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// http://code.google.com/p/inferno-os/source/browse/libkern/memset-arm.s
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
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// Portions Copyright 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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TO = 1
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TOE = 2
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N = 3
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TMP = 3 /* N and TMP don't overlap */
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// TODO(kaib): memset clobbers R9 and R10 (m and g). This makes the
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// registers unpredictable if (when) memset SIGSEGV's. Fix it by
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// moving the R4-R11 register bank.
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TEXT runtime·memset(SB), $0
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MOVW R0, R(TO)
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MOVW data+4(FP), R(4)
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MOVW n+8(FP), R(N)
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ADD R(N), R(TO), R(TOE) /* to end pointer */
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CMP $4, R(N) /* need at least 4 bytes to copy */
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BLT _1tail
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AND $0xFF, R(4) /* it's a byte */
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SLL $8, R(4), R(TMP) /* replicate to a word */
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ORR R(TMP), R(4)
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SLL $16, R(4), R(TMP)
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ORR R(TMP), R(4)
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_4align: /* align on 4 */
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AND.S $3, R(TO), R(TMP)
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BEQ _4aligned
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MOVBU.P R(4), 1(R(TO)) /* implicit write back */
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B _4align
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_4aligned:
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SUB $31, R(TOE), R(TMP) /* do 32-byte chunks if possible */
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CMP R(TMP), R(TO)
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BHS _4tail
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MOVW R4, R5 /* replicate */
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MOVW R4, R6
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MOVW R4, R7
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MOVW R4, R8
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MOVW R4, R9
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MOVW R4, R10
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MOVW R4, R11
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_f32loop:
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CMP R(TMP), R(TO)
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BHS _4tail
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MOVM.IA.W [R4-R11], (R(TO))
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B _f32loop
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_4tail:
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SUB $3, R(TOE), R(TMP) /* do remaining words if possible */
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_4loop:
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CMP R(TMP), R(TO)
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BHS _1tail
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MOVW.P R(4), 4(R(TO)) /* implicit write back */
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B _4loop
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_1tail:
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CMP R(TO), R(TOE)
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BEQ _return
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MOVBU.P R(4), 1(R(TO)) /* implicit write back */
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B _1tail
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_return:
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RET
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