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// Inferno's libkern/memset-arm.s // https://bitbucket.org/inferno-os/inferno-os/src/master/libkern/memset-arm.s // // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. // Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved. // Portions Copyright 2009 The Go Authors. All rights reserved. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. #include "textflag.h" #define TO R8 #define TOE R11 #define N R12 #define TMP R12 /* N and TMP don't overlap */ // See memclrNoHeapPointers Go doc for important implementation constraints. // func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) // Also called from assembly in sys_windows_arm.s without g (but using Go stack convention). TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8 MOVW ptr+0(FP), TO MOVW n+4(FP), N MOVW $0, R0 ADD N, TO, TOE /* to end pointer */ CMP $4, N /* need at least 4 bytes to copy */ BLT _1tail _4align: /* align on 4 */ AND.S $3, TO, TMP BEQ _4aligned MOVBU.P R0, 1(TO) /* implicit write back */ B _4align _4aligned: SUB $31, TOE, TMP /* do 32-byte chunks if possible */ CMP TMP, TO BHS _4tail MOVW R0, R1 /* replicate */ MOVW R0, R2 MOVW R0, R3 MOVW R0, R4 MOVW R0, R5 MOVW R0, R6 MOVW R0, R7 _f32loop: CMP TMP, TO BHS _4tail MOVM.IA.W [R0-R7], (TO) B _f32loop _4tail: SUB $3, TOE, TMP /* do remaining words if possible */ _4loop: CMP TMP, TO BHS _1tail MOVW.P R0, 4(TO) /* implicit write back */ B _4loop _1tail: CMP TO, TOE BEQ _return MOVBU.P R0, 1(TO) /* implicit write back */ B _1tail _return: RET