| /* Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| Contributed by Richard Henderson (rth@redhat.com) |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* Copy no more than N bytes from SRC to DEST, returning the address of |
| the terminating '\0' in DEST. */ |
| |
| #include <sysdep.h> |
| |
| .arch ev6 |
| .set noat |
| .set noreorder |
| .text |
| |
| ENTRY(__stpncpy) |
| ldgp gp, 0(pv) |
| #ifdef PROF |
| lda AT, _mcount |
| jsr AT, (AT), _mcount |
| #endif |
| .prologue 1 |
| |
| mov a0, v0 |
| beq a2, $zerocount |
| |
| .align 4 |
| nop |
| nop |
| jsr t9, __stxncpy # do the work of the copy |
| |
| cttz t8, t4 |
| zapnot t0, t8, t5 |
| andnot a0, 7, a0 |
| bne a2, $multiword # do we have full words left? |
| |
| subq t8, 1, t2 |
| subq t10, 1, t3 |
| cmpult zero, t5, t5 |
| addq a0, t4, v0 |
| |
| or t2, t8, t2 |
| or t3, t10, t3 |
| addq v0, t5, v0 |
| andnot t3, t2, t3 |
| |
| zap t0, t3, t0 |
| nop |
| stq t0, 0(a0) |
| ret |
| |
| $multiword: |
| subq t8, 1, t7 # clear the final bits in the prev word |
| cmpult zero, t5, t5 |
| or t7, t8, t7 |
| zapnot t0, t7, t0 |
| |
| subq a2, 1, a2 |
| stq t0, 0(a0) |
| addq a0, 8, a1 |
| beq a2, 1f # loop over full words remaining |
| |
| nop |
| nop |
| nop |
| blbc a2, 0f |
| |
| stq zero, 0(a1) |
| subq a2, 1, a2 |
| addq a1, 8, a1 |
| beq a2, 1f |
| |
| 0: stq zero, 0(a1) |
| subq a2, 2, a2 |
| nop |
| nop |
| |
| stq zero, 8(a1) |
| addq a1, 16, a1 |
| nop |
| bne a2, 0b |
| |
| 1: ldq t0, 0(a1) # clear the leading bits in the final word |
| subq t10, 1, t7 |
| addq a0, t4, v0 |
| nop |
| |
| or t7, t10, t7 |
| addq v0, t5, v0 |
| zap t0, t7, t0 |
| stq t0, 0(a1) |
| |
| $zerocount: |
| nop |
| nop |
| nop |
| ret |
| |
| END(__stpncpy) |
| |
| libc_hidden_def (__stpncpy) |
| weak_alias (__stpncpy, stpncpy) |
