115 lines
2.1 KiB
ArmAsm
115 lines
2.1 KiB
ArmAsm
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/* Copyright (C) 2000-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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/* Copy no more than N bytes from SRC to DEST, returning the address of
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the terminating '\0' in DEST. */
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#include <sysdep.h>
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.arch ev6
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.set noat
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.set noreorder
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.text
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ENTRY(__stpncpy)
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ldgp gp, 0(pv)
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#ifdef PROF
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lda AT, _mcount
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jsr AT, (AT), _mcount
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#endif
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.prologue 1
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mov a0, v0
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beq a2, $zerocount
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.align 4
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nop
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nop
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jsr t9, __stxncpy # do the work of the copy
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cttz t8, t4
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zapnot t0, t8, t5
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andnot a0, 7, a0
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bne a2, $multiword # do we have full words left?
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subq t8, 1, t2
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subq t10, 1, t3
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cmpult zero, t5, t5
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addq a0, t4, v0
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or t2, t8, t2
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or t3, t10, t3
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addq v0, t5, v0
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andnot t3, t2, t3
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zap t0, t3, t0
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nop
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stq t0, 0(a0)
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ret
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$multiword:
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subq t8, 1, t7 # clear the final bits in the prev word
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cmpult zero, t5, t5
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or t7, t8, t7
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zapnot t0, t7, t0
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subq a2, 1, a2
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stq t0, 0(a0)
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addq a0, 8, a1
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beq a2, 1f # loop over full words remaining
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nop
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nop
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nop
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blbc a2, 0f
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stq zero, 0(a1)
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subq a2, 1, a2
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addq a1, 8, a1
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beq a2, 1f
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0: stq zero, 0(a1)
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subq a2, 2, a2
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nop
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nop
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stq zero, 8(a1)
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addq a1, 16, a1
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nop
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bne a2, 0b
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1: ldq t0, 0(a1) # clear the leading bits in the final word
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subq t10, 1, t7
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addq a0, t4, v0
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nop
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or t7, t10, t7
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addq v0, t5, v0
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zap t0, t7, t0
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stq t0, 0(a1)
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$zerocount:
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nop
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nop
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nop
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ret
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END(__stpncpy)
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libc_hidden_def (__stpncpy)
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weak_alias (__stpncpy, stpncpy)
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