| 1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* Append a null-terminated string from SRC to DST. */ |
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| 19 | |
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| 20 | #include <sysdep.h> |
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| 21 | |
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| 22 | .arch ev6 |
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| 23 | .set noreorder |
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| 24 | .text |
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| 25 | |
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| 26 | ENTRY(strcat) |
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| 27 | ldgp gp, 0(pv) |
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| 28 | #ifdef PROF |
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| 29 | .set noat |
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| 30 | lda AT, _mcount |
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| 31 | jsr AT, (AT), _mcount |
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| 32 | .set at |
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| 33 | #endif |
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| 34 | .prologue 1 |
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| 35 | |
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| 36 | mov $16, $0 # E : set up return value |
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| 37 | /* Find the end of the string. */ |
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| 38 | ldq_u $1, 0($16) # L : load first quadword (a0 may be misaligned) |
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| 39 | lda $2, -1 # E : |
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| 40 | insqh $2, $16, $2 # U : |
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| 41 | |
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| 42 | andnot $16, 7, $16 # E : |
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| 43 | or $2, $1, $1 # E : |
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| 44 | cmpbge $31, $1, $2 # E : bits set iff byte == 0 |
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| 45 | bne $2, $found # U : |
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| 46 | |
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| 47 | $loop: ldq $1, 8($16) # L : |
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| 48 | addq $16, 8, $16 # E : |
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| 49 | cmpbge $31, $1, $2 # E : |
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| 50 | beq $2, $loop # U : |
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| 51 | |
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| 52 | $found: cttz $2, $3 # U0 : |
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| 53 | addq $16, $3, $16 # E : |
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| 54 | /* Now do the append. */ |
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| 55 | mov $26, $23 # E : |
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| 56 | jmp $31, __stxcpy # L0 : |
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| 57 | |
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| 58 | END(strcat) |
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| 59 | libc_hidden_builtin_def (strcat) |
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| 60 | |
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