diff options
Diffstat (limited to 'arch/ppc/lib/string.S')
| -rw-r--r-- | arch/ppc/lib/string.S | 732 |
1 files changed, 0 insertions, 732 deletions
diff --git a/arch/ppc/lib/string.S b/arch/ppc/lib/string.S deleted file mode 100644 index 927253b..0000000 --- a/arch/ppc/lib/string.S +++ /dev/null @@ -1,732 +0,0 @@ -/* - * String handling functions for PowerPC. - * - * Copyright (C) 1996 Paul Mackerras. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ -#include <asm/processor.h> -#include <asm/cache.h> -#include <asm/errno.h> -#include <asm/ppc_asm.h> - -#define COPY_16_BYTES \ - lwz r7,4(r4); \ - lwz r8,8(r4); \ - lwz r9,12(r4); \ - lwzu r10,16(r4); \ - stw r7,4(r6); \ - stw r8,8(r6); \ - stw r9,12(r6); \ - stwu r10,16(r6) - -#define COPY_16_BYTES_WITHEX(n) \ -8 ## n ## 0: \ - lwz r7,4(r4); \ -8 ## n ## 1: \ - lwz r8,8(r4); \ -8 ## n ## 2: \ - lwz r9,12(r4); \ -8 ## n ## 3: \ - lwzu r10,16(r4); \ -8 ## n ## 4: \ - stw r7,4(r6); \ -8 ## n ## 5: \ - stw r8,8(r6); \ -8 ## n ## 6: \ - stw r9,12(r6); \ -8 ## n ## 7: \ - stwu r10,16(r6) - -#define COPY_16_BYTES_EXCODE(n) \ -9 ## n ## 0: \ - addi r5,r5,-(16 * n); \ - b 104f; \ -9 ## n ## 1: \ - addi r5,r5,-(16 * n); \ - b 105f; \ -.section __ex_table,"a"; \ - .align 2; \ - .long 8 ## n ## 0b,9 ## n ## 0b; \ - .long 8 ## n ## 1b,9 ## n ## 0b; \ - .long 8 ## n ## 2b,9 ## n ## 0b; \ - .long 8 ## n ## 3b,9 ## n ## 0b; \ - .long 8 ## n ## 4b,9 ## n ## 1b; \ - .long 8 ## n ## 5b,9 ## n ## 1b; \ - .long 8 ## n ## 6b,9 ## n ## 1b; \ - .long 8 ## n ## 7b,9 ## n ## 1b; \ - .text - - .text - .stabs "arch/ppc/lib/",N_SO,0,0,0f - .stabs "string.S",N_SO,0,0,0f - -CACHELINE_BYTES = L1_CACHE_BYTES -LG_CACHELINE_BYTES = L1_CACHE_SHIFT -CACHELINE_MASK = (L1_CACHE_BYTES-1) - -_GLOBAL(strcpy) - addi r5,r3,-1 - addi r4,r4,-1 -1: lbzu r0,1(r4) - cmpwi 0,r0,0 - stbu r0,1(r5) - bne 1b - blr - -/* This clears out any unused part of the destination buffer, - just as the libc version does. -- paulus */ -_GLOBAL(strncpy) - cmpwi 0,r5,0 - beqlr - mtctr r5 - addi r6,r3,-1 - addi r4,r4,-1 -1: lbzu r0,1(r4) - cmpwi 0,r0,0 - stbu r0,1(r6) - bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ - bnelr /* if we didn't hit a null char, we're done */ - mfctr r5 - cmpwi 0,r5,0 /* any space left in destination buffer? */ - beqlr /* we know r0 == 0 here */ -2: stbu r0,1(r6) /* clear it out if so */ - bdnz 2b - blr - -_GLOBAL(strcat) - addi r5,r3,-1 - addi r4,r4,-1 -1: lbzu r0,1(r5) - cmpwi 0,r0,0 - bne 1b - addi r5,r5,-1 -1: lbzu r0,1(r4) - cmpwi 0,r0,0 - stbu r0,1(r5) - bne 1b - blr - -_GLOBAL(strcmp) - addi r5,r3,-1 - addi r4,r4,-1 -1: lbzu r3,1(r5) - cmpwi 1,r3,0 - lbzu r0,1(r4) - subf. r3,r0,r3 - beqlr 1 - beq 1b - blr - -_GLOBAL(strncmp) - PPC_LCMPI r5,0 - beqlr - mtctr r5 - addi r5,r3,-1 - addi r4,r4,-1 -1: lbzu r3,1(r5) - cmpwi 1,r3,0 - lbzu r0,1(r4) - subf. r3,r0,r3 - beqlr 1 - bdnzt eq,1b - blr - -_GLOBAL(strlen) - addi r4,r3,-1 -1: lbzu r0,1(r4) - cmpwi 0,r0,0 - bne 1b - subf r3,r3,r4 - blr - -/* - * Use dcbz on the complete cache lines in the destination - * to set them to zero. This requires that the destination - * area is cacheable. -- paulus - */ -_GLOBAL(cacheable_memzero) - mr r5,r4 - li r4,0 - addi r6,r3,-4 - cmplwi 0,r5,4 - blt 7f - stwu r4,4(r6) - beqlr - andi. r0,r6,3 - add r5,r0,r5 - subf r6,r0,r6 - clrlwi r7,r6,32-LG_CACHELINE_BYTES - add r8,r7,r5 - srwi r9,r8,LG_CACHELINE_BYTES - addic. r9,r9,-1 /* total number of complete cachelines */ - ble 2f - xori r0,r7,CACHELINE_MASK & ~3 - srwi. r0,r0,2 - beq 3f - mtctr r0 -4: stwu r4,4(r6) - bdnz 4b -3: mtctr r9 - li r7,4 -#if !defined(CONFIG_8xx) -10: dcbz r7,r6 -#else -10: stw r4, 4(r6) - stw r4, 8(r6) - stw r4, 12(r6) - stw r4, 16(r6) -#if CACHE_LINE_SIZE >= 32 - stw r4, 20(r6) - stw r4, 24(r6) - stw r4, 28(r6) - stw r4, 32(r6) -#endif /* CACHE_LINE_SIZE */ -#endif - addi r6,r6,CACHELINE_BYTES - bdnz 10b - clrlwi r5,r8,32-LG_CACHELINE_BYTES - addi r5,r5,4 -2: srwi r0,r5,2 - mtctr r0 - bdz 6f -1: stwu r4,4(r6) - bdnz 1b -6: andi. r5,r5,3 -7: cmpwi 0,r5,0 - beqlr - mtctr r5 - addi r6,r6,3 -8: stbu r4,1(r6) - bdnz 8b - blr - -_GLOBAL(memset) - rlwimi r4,r4,8,16,23 - rlwimi r4,r4,16,0,15 - addi r6,r3,-4 - cmplwi 0,r5,4 - blt 7f - stwu r4,4(r6) - beqlr - andi. r0,r6,3 - add r5,r0,r5 - subf r6,r0,r6 - srwi r0,r5,2 - mtctr r0 - bdz 6f -1: stwu r4,4(r6) - bdnz 1b -6: andi. r5,r5,3 -7: cmpwi 0,r5,0 - beqlr - mtctr r5 - addi r6,r6,3 -8: stbu r4,1(r6) - bdnz 8b - blr - -/* - * This version uses dcbz on the complete cache lines in the - * destination area to reduce memory traffic. This requires that - * the destination area is cacheable. - * We only use this version if the source and dest don't overlap. - * -- paulus. - */ -_GLOBAL(cacheable_memcpy) - add r7,r3,r5 /* test if the src & dst overlap */ - add r8,r4,r5 - cmplw 0,r4,r7 - cmplw 1,r3,r8 - crand 0,0,4 /* cr0.lt &= cr1.lt */ - blt memcpy /* if regions overlap */ - - addi r4,r4,-4 - addi r6,r3,-4 - neg r0,r3 - andi. r0,r0,CACHELINE_MASK /* # bytes to start of cache line */ - beq 58f - - cmplw 0,r5,r0 /* is this more than total to do? */ - blt 63f /* if not much to do */ - andi. r8,r0,3 /* get it word-aligned first */ - subf r5,r0,r5 - mtctr r8 - beq+ 61f -70: lbz r9,4(r4) /* do some bytes */ - stb r9,4(r6) - addi r4,r4,1 - addi r6,r6,1 - bdnz 70b -61: srwi. r0,r0,2 - mtctr r0 - beq 58f -72: lwzu r9,4(r4) /* do some words */ - stwu r9,4(r6) - bdnz 72b - -58: srwi. r0,r5,LG_CACHELINE_BYTES /* # complete cachelines */ - clrlwi r5,r5,32-LG_CACHELINE_BYTES - li r11,4 - mtctr r0 - beq 63f -53: -#if !defined(CONFIG_8xx) - dcbz r11,r6 -#endif - COPY_16_BYTES -#if L1_CACHE_BYTES >= 32 - COPY_16_BYTES -#if L1_CACHE_BYTES >= 64 - COPY_16_BYTES - COPY_16_BYTES -#if L1_CACHE_BYTES >= 128 - COPY_16_BYTES - COPY_16_BYTES - COPY_16_BYTES - COPY_16_BYTES -#endif -#endif -#endif - bdnz 53b - -63: srwi. r0,r5,2 - mtctr r0 - beq 64f -30: lwzu r0,4(r4) - stwu r0,4(r6) - bdnz 30b - -64: andi. r0,r5,3 - mtctr r0 - beq+ 65f -40: lbz r0,4(r4) - stb r0,4(r6) - addi r4,r4,1 - addi r6,r6,1 - bdnz 40b -65: blr - -_GLOBAL(memmove) - cmplw 0,r3,r4 - bgt backwards_memcpy - /* fall through */ - -_GLOBAL(memcpy) - srwi. r7,r5,3 - addi r6,r3,-4 - addi r4,r4,-4 - beq 2f /* if less than 8 bytes to do */ - andi. r0,r6,3 /* get dest word aligned */ - mtctr r7 - bne 5f -1: lwz r7,4(r4) - lwzu r8,8(r4) - stw r7,4(r6) - stwu r8,8(r6) - bdnz 1b - andi. r5,r5,7 -2: cmplwi 0,r5,4 - blt 3f - lwzu r0,4(r4) - addi r5,r5,-4 - stwu r0,4(r6) -3: cmpwi 0,r5,0 - beqlr - mtctr r5 - addi r4,r4,3 - addi r6,r6,3 -4: lbzu r0,1(r4) - stbu r0,1(r6) - bdnz 4b - blr -5: subfic r0,r0,4 - mtctr r0 -6: lbz r7,4(r4) - addi r4,r4,1 - stb r7,4(r6) - addi r6,r6,1 - bdnz 6b - subf r5,r0,r5 - rlwinm. r7,r5,32-3,3,31 - beq 2b - mtctr r7 - b 1b - -_GLOBAL(backwards_memcpy) - rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ - add r6,r3,r5 - add r4,r4,r5 - beq 2f - andi. r0,r6,3 - mtctr r7 - bne 5f -1: lwz r7,-4(r4) - lwzu r8,-8(r4) - stw r7,-4(r6) - stwu r8,-8(r6) - bdnz 1b - andi. r5,r5,7 -2: cmplwi 0,r5,4 - blt 3f - lwzu r0,-4(r4) - subi r5,r5,4 - stwu r0,-4(r6) -3: cmpwi 0,r5,0 - beqlr - mtctr r5 -4: lbzu r0,-1(r4) - stbu r0,-1(r6) - bdnz 4b - blr -5: mtctr r0 -6: lbzu r7,-1(r4) - stbu r7,-1(r6) - bdnz 6b - subf r5,r0,r5 - rlwinm. r7,r5,32-3,3,31 - beq 2b - mtctr r7 - b 1b - -_GLOBAL(memcmp) - cmpwi 0,r5,0 - ble- 2f - mtctr r5 - addi r6,r3,-1 - addi r4,r4,-1 -1: lbzu r3,1(r6) - lbzu r0,1(r4) - subf. r3,r0,r3 - bdnzt 2,1b - blr -2: li r3,0 - blr - -_GLOBAL(memchr) - cmpwi 0,r5,0 - ble- 2f - mtctr r5 - addi r3,r3,-1 -1: lbzu r0,1(r3) - cmpw 0,r0,r4 - bdnzf 2,1b - beqlr -2: li r3,0 - blr - -_GLOBAL(__copy_tofrom_user) - addi r4,r4,-4 - addi r6,r3,-4 - neg r0,r3 - andi. r0,r0,CACHELINE_MASK /* # bytes to start of cache line */ - beq 58f - - cmplw 0,r5,r0 /* is this more than total to do? */ - blt 63f /* if not much to do */ - andi. r8,r0,3 /* get it word-aligned first */ - mtctr r8 - beq+ 61f -70: lbz r9,4(r4) /* do some bytes */ -71: stb r9,4(r6) - addi r4,r4,1 - addi r6,r6,1 - bdnz 70b -61: subf r5,r0,r5 - srwi. r0,r0,2 - mtctr r0 - beq 58f -72: lwzu r9,4(r4) /* do some words */ -73: stwu r9,4(r6) - bdnz 72b - - .section __ex_table,"a" - .align 2 - .long 70b,100f - .long 71b,101f - .long 72b,102f - .long 73b,103f - .text - -58: srwi. r0,r5,LG_CACHELINE_BYTES /* # complete cachelines */ - clrlwi r5,r5,32-LG_CACHELINE_BYTES - li r11,4 - beq 63f - -#ifdef CONFIG_8xx - /* Don't use prefetch on 8xx */ - mtctr r0 - li r0,0 -53: COPY_16_BYTES_WITHEX(0) - bdnz 53b - -#else /* not CONFIG_8xx */ - /* Here we decide how far ahead to prefetch the source */ - li r3,4 - cmpwi r0,1 - li r7,0 - ble 114f - li r7,1 -#if MAX_COPY_PREFETCH > 1 - /* Heuristically, for large transfers we prefetch - MAX_COPY_PREFETCH cachelines ahead. For small transfers - we prefetch 1 cacheline ahead. */ - cmpwi r0,MAX_COPY_PREFETCH - ble 112f - li r7,MAX_COPY_PREFETCH -112: mtctr r7 -111: dcbt r3,r4 - addi r3,r3,CACHELINE_BYTES - bdnz 111b -#else - dcbt r3,r4 - addi r3,r3,CACHELINE_BYTES -#endif /* MAX_COPY_PREFETCH > 1 */ - -114: subf r8,r7,r0 - mr r0,r7 - mtctr r8 - -53: dcbt r3,r4 -54: dcbz r11,r6 - .section __ex_table,"a" - .align 2 - .long 54b,105f - .text -/* the main body of the cacheline loop */ - COPY_16_BYTES_WITHEX(0) -#if L1_CACHE_BYTES >= 32 - COPY_16_BYTES_WITHEX(1) -#if L1_CACHE_BYTES >= 64 - COPY_16_BYTES_WITHEX(2) - COPY_16_BYTES_WITHEX(3) -#if L1_CACHE_BYTES >= 128 - COPY_16_BYTES_WITHEX(4) - COPY_16_BYTES_WITHEX(5) - COPY_16_BYTES_WITHEX(6) - COPY_16_BYTES_WITHEX(7) -#endif -#endif -#endif - bdnz 53b - cmpwi r0,0 - li r3,4 - li r7,0 - bne 114b -#endif /* CONFIG_8xx */ - -63: srwi. r0,r5,2 - mtctr r0 - beq 64f -30: lwzu r0,4(r4) -31: stwu r0,4(r6) - bdnz 30b - -64: andi. r0,r5,3 - mtctr r0 - beq+ 65f -40: lbz r0,4(r4) -41: stb r0,4(r6) - addi r4,r4,1 - addi r6,r6,1 - bdnz 40b -65: li r3,0 - blr - -/* read fault, initial single-byte copy */ -100: li r9,0 - b 90f -/* write fault, initial single-byte copy */ -101: li r9,1 -90: subf r5,r8,r5 - li r3,0 - b 99f -/* read fault, initial word copy */ -102: li r9,0 - b 91f -/* write fault, initial word copy */ -103: li r9,1 -91: li r3,2 - b 99f - -/* - * this stuff handles faults in the cacheline loop and branches to either - * 104f (if in read part) or 105f (if in write part), after updating r5 - */ - COPY_16_BYTES_EXCODE(0) -#if L1_CACHE_BYTES >= 32 - COPY_16_BYTES_EXCODE(1) -#if L1_CACHE_BYTES >= 64 - COPY_16_BYTES_EXCODE(2) - COPY_16_BYTES_EXCODE(3) -#if L1_CACHE_BYTES >= 128 - COPY_16_BYTES_EXCODE(4) - COPY_16_BYTES_EXCODE(5) - COPY_16_BYTES_EXCODE(6) - COPY_16_BYTES_EXCODE(7) -#endif -#endif -#endif - -/* read fault in cacheline loop */ -104: li r9,0 - b 92f -/* fault on dcbz (effectively a write fault) */ -/* or write fault in cacheline loop */ -105: li r9,1 -92: li r3,LG_CACHELINE_BYTES - mfctr r8 - add r0,r0,r8 - b 106f -/* read fault in final word loop */ -108: li r9,0 - b 93f -/* write fault in final word loop */ -109: li r9,1 -93: andi. r5,r5,3 - li r3,2 - b 99f -/* read fault in final byte loop */ -110: li r9,0 - b 94f -/* write fault in final byte loop */ -111: li r9,1 -94: li r5,0 - li r3,0 -/* - * At this stage the number of bytes not copied is - * r5 + (ctr << r3), and r9 is 0 for read or 1 for write. - */ -99: mfctr r0 -106: slw r3,r0,r3 - add. r3,r3,r5 - beq 120f /* shouldn't happen */ - cmpwi 0,r9,0 - bne 120f -/* for a read fault, first try to continue the copy one byte at a time */ - mtctr r3 -130: lbz r0,4(r4) -131: stb r0,4(r6) - addi r4,r4,1 - addi r6,r6,1 - bdnz 130b -/* then clear out the destination: r3 bytes starting at 4(r6) */ -132: mfctr r3 - srwi. r0,r3,2 - li r9,0 - mtctr r0 - beq 113f -112: stwu r9,4(r6) - bdnz 112b -113: andi. r0,r3,3 - mtctr r0 - beq 120f -114: stb r9,4(r6) - addi r6,r6,1 - bdnz 114b -120: blr - - .section __ex_table,"a" - .align 2 - .long 30b,108b - .long 31b,109b - .long 40b,110b - .long 41b,111b - .long 130b,132b - .long 131b,120b - .long 112b,120b - .long 114b,120b - .text - -_GLOBAL(__clear_user) - addi r6,r3,-4 - li r3,0 - li r5,0 - cmplwi 0,r4,4 - blt 7f - /* clear a single word */ -11: stwu r5,4(r6) - beqlr - /* clear word sized chunks */ - andi. r0,r6,3 - add r4,r0,r4 - subf r6,r0,r6 - srwi r0,r4,2 - andi. r4,r4,3 - mtctr r0 - bdz 7f -1: stwu r5,4(r6) - bdnz 1b - /* clear byte sized chunks */ -7: cmpwi 0,r4,0 - beqlr - mtctr r4 - addi r6,r6,3 -8: stbu r5,1(r6) - bdnz 8b - blr -90: mr r3,r4 - blr -91: mfctr r3 - slwi r3,r3,2 - add r3,r3,r4 - blr -92: mfctr r3 - blr - - .section __ex_table,"a" - .align 2 - .long 11b,90b - .long 1b,91b - .long 8b,92b - .text - -_GLOBAL(__strncpy_from_user) - addi r6,r3,-1 - addi r4,r4,-1 - cmpwi 0,r5,0 - beq 2f - mtctr r5 -1: lbzu r0,1(r4) - cmpwi 0,r0,0 - stbu r0,1(r6) - bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ - beq 3f -2: addi r6,r6,1 -3: subf r3,r3,r6 - blr -99: li r3,-EFAULT - blr - - .section __ex_table,"a" - .align 2 - .long 1b,99b - .text - -/* r3 = str, r4 = len (> 0), r5 = top (highest addr) */ -_GLOBAL(__strnlen_user) - addi r7,r3,-1 - subf r6,r7,r5 /* top+1 - str */ - cmplw 0,r4,r6 - bge 0f - mr r6,r4 -0: mtctr r6 /* ctr = min(len, top - str) */ -1: lbzu r0,1(r7) /* get next byte */ - cmpwi 0,r0,0 - bdnzf 2,1b /* loop if --ctr != 0 && byte != 0 */ - addi r7,r7,1 - subf r3,r3,r7 /* number of bytes we have looked at */ - beqlr /* return if we found a 0 byte */ - cmpw 0,r3,r4 /* did we look at all len bytes? */ - blt 99f /* if not, must have hit top */ - addi r3,r4,1 /* return len + 1 to indicate no null found */ - blr -99: li r3,0 /* bad address, return 0 */ - blr - - .section __ex_table,"a" - .align 2 - .long 1b,99b |