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 <linux/export.h> 8 #include <asm/ppc_asm.h> 9 #include <asm/cache.h> 10 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) 34 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) 52 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) 66