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| /* SPDX-License-Identifier: GPL-2.0-or-later */
| /*
| * Memory copy functions for 32-bit PowerPC.
| *
| * Copyright (C) 1996-2005 Paul Mackerras.
| */
| #include <asm/processor.h>
| #include <asm/cache.h>
| #include <asm/errno.h>
| #include <asm/ppc_asm.h>
| #include <asm/export.h>
| #include <asm/code-patching-asm.h>
| #include <asm/kasan.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; \
| EX_TABLE(8 ## n ## 0b,9 ## n ## 0b); \
| EX_TABLE(8 ## n ## 1b,9 ## n ## 0b); \
| EX_TABLE(8 ## n ## 2b,9 ## n ## 0b); \
| EX_TABLE(8 ## n ## 3b,9 ## n ## 0b); \
| EX_TABLE(8 ## n ## 4b,9 ## n ## 1b); \
| EX_TABLE(8 ## n ## 5b,9 ## n ## 1b); \
| EX_TABLE(8 ## n ## 6b,9 ## n ## 1b); \
| EX_TABLE(8 ## n ## 7b,9 ## n ## 1b)
|
| .text
| .stabs "arch/powerpc/lib/",N_SO,0,0,0f
| .stabs "copy_32.S",N_SO,0,0,0f
| 0:
|
| CACHELINE_BYTES = L1_CACHE_BYTES
| LG_CACHELINE_BYTES = L1_CACHE_SHIFT
| CACHELINE_MASK = (L1_CACHE_BYTES-1)
|
| #ifndef CONFIG_KASAN
| _GLOBAL(memset16)
| rlwinm. r0 ,r5, 31, 1, 31
| addi r6, r3, -4
| beq- 2f
| rlwimi r4 ,r4 ,16 ,0 ,15
| mtctr r0
| 1: stwu r4, 4(r6)
| bdnz 1b
| 2: andi. r0, r5, 1
| beqlr
| sth r4, 4(r6)
| blr
| EXPORT_SYMBOL(memset16)
| #endif
|
| /*
| * Use dcbz on the complete cache lines in the destination
| * to set them to zero. This requires that the destination
| * area is cacheable. -- paulus
| *
| * During early init, cache might not be active yet, so dcbz cannot be used.
| * We therefore skip the optimised bloc that uses dcbz. This jump is
| * replaced by a nop once cache is active. This is done in machine_init()
| */
| _GLOBAL_KASAN(memset)
| cmplwi 0,r5,4
| blt 7f
|
| rlwimi r4,r4,8,16,23
| rlwimi r4,r4,16,0,15
|
| stw r4,0(r3)
| beqlr
| andi. r0,r3,3
| add r5,r0,r5
| subf r6,r0,r3
| cmplwi 0,r4,0
| /*
| * Skip optimised bloc until cache is enabled. Will be replaced
| * by 'bne' during boot to use normal procedure if r4 is not zero
| */
| 5: b 2f
| patch_site 5b, patch__memset_nocache
|
| 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
| 10: dcbz r7,r6
| 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
| beqlr
| mtctr r5
| addi r6,r6,3
| 8: stbu r4,1(r6)
| bdnz 8b
| blr
|
| 7: cmpwi 0,r5,0
| beqlr
| mtctr r5
| addi r6,r3,-1
| 9: stbu r4,1(r6)
| bdnz 9b
| blr
| EXPORT_SYMBOL(memset)
| EXPORT_SYMBOL_KASAN(memset)
|
| /*
| * 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.
| *
| * During early init, cache might not be active yet, so dcbz cannot be used.
| * We therefore jump to generic_memcpy which doesn't use dcbz. This jump is
| * replaced by a nop once cache is active. This is done in machine_init()
| */
| _GLOBAL_KASAN(memmove)
| cmplw 0,r3,r4
| bgt backwards_memcpy
| /* fall through */
|
| _GLOBAL_KASAN(memcpy)
| 1: b generic_memcpy
| patch_site 1b, patch__memcpy_nocache
|
| 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 generic_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 */
| addi r4,r4,1
| addi r6,r6,1
| stb r9,3(r6)
| 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:
| dcbz r11,r6
| 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
| addi r4,r4,3
| addi r6,r6,3
| 40: lbzu r0,1(r4)
| stbu r0,1(r6)
| bdnz 40b
| 65: blr
| EXPORT_SYMBOL(memcpy)
| EXPORT_SYMBOL(memmove)
| EXPORT_SYMBOL_KASAN(memcpy)
| EXPORT_SYMBOL_KASAN(memmove)
|
| generic_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(__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
|
| EX_TABLE(70b,100f)
| EX_TABLE(71b,101f)
| EX_TABLE(72b,102f)
| EX_TABLE(73b,103f)
|
| 58: srwi. r0,r5,LG_CACHELINE_BYTES /* # complete cachelines */
| clrlwi r5,r5,32-LG_CACHELINE_BYTES
| li r11,4
| beq 63f
|
| /* 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
| EX_TABLE(54b,105f)
| /* 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
|
| 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
| 120: blr
|
| EX_TABLE(30b,108b)
| EX_TABLE(31b,109b)
| EX_TABLE(40b,110b)
| EX_TABLE(41b,111b)
| EX_TABLE(130b,132b)
| EX_TABLE(131b,120b)
|
| EXPORT_SYMBOL(__copy_tofrom_user)
|
|
