arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / powerpc / lib / string.S
blob2752b1cc1d45f0496ac1effa410d24d46bca0244
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * String handling functions for PowerPC.
4  *
5  * Copyright (C) 1996 Paul Mackerras.
6  */
7 #include <asm/ppc_asm.h>
8 #include <asm/export.h>
9 #include <asm/cache.h>
11         .text
12         
13 /* This clears out any unused part of the destination buffer,
14    just as the libc version does.  -- paulus */
15 _GLOBAL(strncpy)
16         PPC_LCMPI 0,r5,0
17         beqlr
18         mtctr   r5
19         addi    r6,r3,-1
20         addi    r4,r4,-1
21         .balign IFETCH_ALIGN_BYTES
22 1:      lbzu    r0,1(r4)
23         cmpwi   0,r0,0
24         stbu    r0,1(r6)
25         bdnzf   2,1b            /* dec ctr, branch if ctr != 0 && !cr0.eq */
26         bnelr                   /* if we didn't hit a null char, we're done */
27         mfctr   r5
28         PPC_LCMPI 0,r5,0        /* any space left in destination buffer? */
29         beqlr                   /* we know r0 == 0 here */
30 2:      stbu    r0,1(r6)        /* clear it out if so */
31         bdnz    2b
32         blr
33 EXPORT_SYMBOL(strncpy)
35 _GLOBAL(strncmp)
36         PPC_LCMPI 0,r5,0
37         beq-    2f
38         mtctr   r5
39         addi    r5,r3,-1
40         addi    r4,r4,-1
41         .balign IFETCH_ALIGN_BYTES
42 1:      lbzu    r3,1(r5)
43         cmpwi   1,r3,0
44         lbzu    r0,1(r4)
45         subf.   r3,r0,r3
46         beqlr   1
47         bdnzt   eq,1b
48         blr
49 2:      li      r3,0
50         blr
51 EXPORT_SYMBOL(strncmp)
53 _GLOBAL(memchr)
54         PPC_LCMPI 0,r5,0
55         beq-    2f
56         mtctr   r5
57         addi    r3,r3,-1
58         .balign IFETCH_ALIGN_BYTES
59 1:      lbzu    r0,1(r3)
60         cmpw    0,r0,r4
61         bdnzf   2,1b
62         beqlr
63 2:      li      r3,0
64         blr
65 EXPORT_SYMBOL(memchr)