diff options
Diffstat (limited to 'arch/powerpc/lib/copyuser_64.S')
-rw-r--r-- | arch/powerpc/lib/copyuser_64.S | 576 |
1 files changed, 576 insertions, 0 deletions
diff --git a/arch/powerpc/lib/copyuser_64.S b/arch/powerpc/lib/copyuser_64.S new file mode 100644 index 00000000000..6d69ef39b7d --- /dev/null +++ b/arch/powerpc/lib/copyuser_64.S @@ -0,0 +1,576 @@ +/* + * arch/ppc64/lib/copyuser.S + * + * Copyright (C) 2002 Paul Mackerras, IBM Corp. + * + * 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/ppc_asm.h> + + .align 7 +_GLOBAL(__copy_tofrom_user) + /* first check for a whole page copy on a page boundary */ + cmpldi cr1,r5,16 + cmpdi cr6,r5,4096 + or r0,r3,r4 + neg r6,r3 /* LS 3 bits = # bytes to 8-byte dest bdry */ + andi. r0,r0,4095 + std r3,-24(r1) + crand cr0*4+2,cr0*4+2,cr6*4+2 + std r4,-16(r1) + std r5,-8(r1) + dcbt 0,r4 + beq .Lcopy_page_4K + andi. r6,r6,7 + mtcrf 0x01,r5 + blt cr1,.Lshort_copy + bne .Ldst_unaligned +.Ldst_aligned: + andi. r0,r4,7 + addi r3,r3,-16 + bne .Lsrc_unaligned + srdi r7,r5,4 +20: ld r9,0(r4) + addi r4,r4,-8 + mtctr r7 + andi. r5,r5,7 + bf cr7*4+0,22f + addi r3,r3,8 + addi r4,r4,8 + mr r8,r9 + blt cr1,72f +21: ld r9,8(r4) +70: std r8,8(r3) +22: ldu r8,16(r4) +71: stdu r9,16(r3) + bdnz 21b +72: std r8,8(r3) + beq+ 3f + addi r3,r3,16 +23: ld r9,8(r4) +.Ldo_tail: + bf cr7*4+1,1f + rotldi r9,r9,32 +73: stw r9,0(r3) + addi r3,r3,4 +1: bf cr7*4+2,2f + rotldi r9,r9,16 +74: sth r9,0(r3) + addi r3,r3,2 +2: bf cr7*4+3,3f + rotldi r9,r9,8 +75: stb r9,0(r3) +3: li r3,0 + blr + +.Lsrc_unaligned: + srdi r6,r5,3 + addi r5,r5,-16 + subf r4,r0,r4 + srdi r7,r5,4 + sldi r10,r0,3 + cmpldi cr6,r6,3 + andi. r5,r5,7 + mtctr r7 + subfic r11,r10,64 + add r5,r5,r0 + bt cr7*4+0,28f + +24: ld r9,0(r4) /* 3+2n loads, 2+2n stores */ +25: ld r0,8(r4) + sld r6,r9,r10 +26: ldu r9,16(r4) + srd r7,r0,r11 + sld r8,r0,r10 + or r7,r7,r6 + blt cr6,79f +27: ld r0,8(r4) + b 2f + +28: ld r0,0(r4) /* 4+2n loads, 3+2n stores */ +29: ldu r9,8(r4) + sld r8,r0,r10 + addi r3,r3,-8 + blt cr6,5f +30: ld r0,8(r4) + srd r12,r9,r11 + sld r6,r9,r10 +31: ldu r9,16(r4) + or r12,r8,r12 + srd r7,r0,r11 + sld r8,r0,r10 + addi r3,r3,16 + beq cr6,78f + +1: or r7,r7,r6 +32: ld r0,8(r4) +76: std r12,8(r3) +2: srd r12,r9,r11 + sld r6,r9,r10 +33: ldu r9,16(r4) + or r12,r8,r12 +77: stdu r7,16(r3) + srd r7,r0,r11 + sld r8,r0,r10 + bdnz 1b + +78: std r12,8(r3) + or r7,r7,r6 +79: std r7,16(r3) +5: srd r12,r9,r11 + or r12,r8,r12 +80: std r12,24(r3) + bne 6f + li r3,0 + blr +6: cmpwi cr1,r5,8 + addi r3,r3,32 + sld r9,r9,r10 + ble cr1,.Ldo_tail +34: ld r0,8(r4) + srd r7,r0,r11 + or r9,r7,r9 + b .Ldo_tail + +.Ldst_unaligned: + mtcrf 0x01,r6 /* put #bytes to 8B bdry into cr7 */ + subf r5,r6,r5 + li r7,0 + cmpldi r1,r5,16 + bf cr7*4+3,1f +35: lbz r0,0(r4) +81: stb r0,0(r3) + addi r7,r7,1 +1: bf cr7*4+2,2f +36: lhzx r0,r7,r4 +82: sthx r0,r7,r3 + addi r7,r7,2 +2: bf cr7*4+1,3f +37: lwzx r0,r7,r4 +83: stwx r0,r7,r3 +3: mtcrf 0x01,r5 + add r4,r6,r4 + add r3,r6,r3 + b .Ldst_aligned + +.Lshort_copy: + bf cr7*4+0,1f +38: lwz r0,0(r4) +39: lwz r9,4(r4) + addi r4,r4,8 +84: stw r0,0(r3) +85: stw r9,4(r3) + addi r3,r3,8 +1: bf cr7*4+1,2f +40: lwz r0,0(r4) + addi r4,r4,4 +86: stw r0,0(r3) + addi r3,r3,4 +2: bf cr7*4+2,3f +41: lhz r0,0(r4) + addi r4,r4,2 +87: sth r0,0(r3) + addi r3,r3,2 +3: bf cr7*4+3,4f +42: lbz r0,0(r4) +88: stb r0,0(r3) +4: li r3,0 + blr + +/* + * exception handlers follow + * we have to return the number of bytes not copied + * for an exception on a load, we set the rest of the destination to 0 + */ + +136: +137: + add r3,r3,r7 + b 1f +130: +131: + addi r3,r3,8 +120: +122: +124: +125: +126: +127: +128: +129: +133: + addi r3,r3,8 +121: +132: + addi r3,r3,8 +123: +134: +135: +138: +139: +140: +141: +142: + +/* + * here we have had a fault on a load and r3 points to the first + * unmodified byte of the destination + */ +1: ld r6,-24(r1) + ld r4,-16(r1) + ld r5,-8(r1) + subf r6,r6,r3 + add r4,r4,r6 + subf r5,r6,r5 /* #bytes left to go */ + +/* + * first see if we can copy any more bytes before hitting another exception + */ + mtctr r5 +43: lbz r0,0(r4) + addi r4,r4,1 +89: stb r0,0(r3) + addi r3,r3,1 + bdnz 43b + li r3,0 /* huh? all copied successfully this time? */ + blr + +/* + * here we have trapped again, need to clear ctr bytes starting at r3 + */ +143: mfctr r5 + li r0,0 + mr r4,r3 + mr r3,r5 /* return the number of bytes not copied */ +1: andi. r9,r4,7 + beq 3f +90: stb r0,0(r4) + addic. r5,r5,-1 + addi r4,r4,1 + bne 1b + blr +3: cmpldi cr1,r5,8 + srdi r9,r5,3 + andi. r5,r5,7 + blt cr1,93f + mtctr r9 +91: std r0,0(r4) + addi r4,r4,8 + bdnz 91b +93: beqlr + mtctr r5 +92: stb r0,0(r4) + addi r4,r4,1 + bdnz 92b + blr + +/* + * exception handlers for stores: we just need to work + * out how many bytes weren't copied + */ +182: +183: + add r3,r3,r7 + b 1f +180: + addi r3,r3,8 +171: +177: + addi r3,r3,8 +170: +172: +176: +178: + addi r3,r3,4 +185: + addi r3,r3,4 +173: +174: +175: +179: +181: +184: +186: +187: +188: +189: +1: + ld r6,-24(r1) + ld r5,-8(r1) + add r6,r6,r5 + subf r3,r3,r6 /* #bytes not copied */ +190: +191: +192: + blr /* #bytes not copied in r3 */ + + .section __ex_table,"a" + .align 3 + .llong 20b,120b + .llong 21b,121b + .llong 70b,170b + .llong 22b,122b + .llong 71b,171b + .llong 72b,172b + .llong 23b,123b + .llong 73b,173b + .llong 74b,174b + .llong 75b,175b + .llong 24b,124b + .llong 25b,125b + .llong 26b,126b + .llong 27b,127b + .llong 28b,128b + .llong 29b,129b + .llong 30b,130b + .llong 31b,131b + .llong 32b,132b + .llong 76b,176b + .llong 33b,133b + .llong 77b,177b + .llong 78b,178b + .llong 79b,179b + .llong 80b,180b + .llong 34b,134b + .llong 35b,135b + .llong 81b,181b + .llong 36b,136b + .llong 82b,182b + .llong 37b,137b + .llong 83b,183b + .llong 38b,138b + .llong 39b,139b + .llong 84b,184b + .llong 85b,185b + .llong 40b,140b + .llong 86b,186b + .llong 41b,141b + .llong 87b,187b + .llong 42b,142b + .llong 88b,188b + .llong 43b,143b + .llong 89b,189b + .llong 90b,190b + .llong 91b,191b + .llong 92b,192b + + .text + +/* + * Routine to copy a whole page of data, optimized for POWER4. + * On POWER4 it is more than 50% faster than the simple loop + * above (following the .Ldst_aligned label) but it runs slightly + * slower on POWER3. + */ +.Lcopy_page_4K: + std r31,-32(1) + std r30,-40(1) + std r29,-48(1) + std r28,-56(1) + std r27,-64(1) + std r26,-72(1) + std r25,-80(1) + std r24,-88(1) + std r23,-96(1) + std r22,-104(1) + std r21,-112(1) + std r20,-120(1) + li r5,4096/32 - 1 + addi r3,r3,-8 + li r0,5 +0: addi r5,r5,-24 + mtctr r0 +20: ld r22,640(4) +21: ld r21,512(4) +22: ld r20,384(4) +23: ld r11,256(4) +24: ld r9,128(4) +25: ld r7,0(4) +26: ld r25,648(4) +27: ld r24,520(4) +28: ld r23,392(4) +29: ld r10,264(4) +30: ld r8,136(4) +31: ldu r6,8(4) + cmpwi r5,24 +1: +32: std r22,648(3) +33: std r21,520(3) +34: std r20,392(3) +35: std r11,264(3) +36: std r9,136(3) +37: std r7,8(3) +38: ld r28,648(4) +39: ld r27,520(4) +40: ld r26,392(4) +41: ld r31,264(4) +42: ld r30,136(4) +43: ld r29,8(4) +44: std r25,656(3) +45: std r24,528(3) +46: std r23,400(3) +47: std r10,272(3) +48: std r8,144(3) +49: std r6,16(3) +50: ld r22,656(4) +51: ld r21,528(4) +52: ld r20,400(4) +53: ld r11,272(4) +54: ld r9,144(4) +55: ld r7,16(4) +56: std r28,664(3) +57: std r27,536(3) +58: std r26,408(3) +59: std r31,280(3) +60: std r30,152(3) +61: stdu r29,24(3) +62: ld r25,664(4) +63: ld r24,536(4) +64: ld r23,408(4) +65: ld r10,280(4) +66: ld r8,152(4) +67: ldu r6,24(4) + bdnz 1b +68: std r22,648(3) +69: std r21,520(3) +70: std r20,392(3) +71: std r11,264(3) +72: std r9,136(3) +73: std r7,8(3) +74: addi r4,r4,640 +75: addi r3,r3,648 + bge 0b + mtctr r5 +76: ld r7,0(4) +77: ld r8,8(4) +78: ldu r9,16(4) +3: +79: ld r10,8(4) +80: std r7,8(3) +81: ld r7,16(4) +82: std r8,16(3) +83: ld r8,24(4) +84: std r9,24(3) +85: ldu r9,32(4) +86: stdu r10,32(3) + bdnz 3b +4: +87: ld r10,8(4) +88: std r7,8(3) +89: std r8,16(3) +90: std r9,24(3) +91: std r10,32(3) +9: ld r20,-120(1) + ld r21,-112(1) + ld r22,-104(1) + ld r23,-96(1) + ld r24,-88(1) + ld r25,-80(1) + ld r26,-72(1) + ld r27,-64(1) + ld r28,-56(1) + ld r29,-48(1) + ld r30,-40(1) + ld r31,-32(1) + li r3,0 + blr + +/* + * on an exception, reset to the beginning and jump back into the + * standard __copy_tofrom_user + */ +100: ld r20,-120(1) + ld r21,-112(1) + ld r22,-104(1) + ld r23,-96(1) + ld r24,-88(1) + ld r25,-80(1) + ld r26,-72(1) + ld r27,-64(1) + ld r28,-56(1) + ld r29,-48(1) + ld r30,-40(1) + ld r31,-32(1) + ld r3,-24(r1) + ld r4,-16(r1) + li r5,4096 + b .Ldst_aligned + + .section __ex_table,"a" + .align 3 + .llong 20b,100b + .llong 21b,100b + .llong 22b,100b + .llong 23b,100b + .llong 24b,100b + .llong 25b,100b + .llong 26b,100b + .llong 27b,100b + .llong 28b,100b + .llong 29b,100b + .llong 30b,100b + .llong 31b,100b + .llong 32b,100b + .llong 33b,100b + .llong 34b,100b + .llong 35b,100b + .llong 36b,100b + .llong 37b,100b + .llong 38b,100b + .llong 39b,100b + .llong 40b,100b + .llong 41b,100b + .llong 42b,100b + .llong 43b,100b + .llong 44b,100b + .llong 45b,100b + .llong 46b,100b + .llong 47b,100b + .llong 48b,100b + .llong 49b,100b + .llong 50b,100b + .llong 51b,100b + .llong 52b,100b + .llong 53b,100b + .llong 54b,100b + .llong 55b,100b + .llong 56b,100b + .llong 57b,100b + .llong 58b,100b + .llong 59b,100b + .llong 60b,100b + .llong 61b,100b + .llong 62b,100b + .llong 63b,100b + .llong 64b,100b + .llong 65b,100b + .llong 66b,100b + .llong 67b,100b + .llong 68b,100b + .llong 69b,100b + .llong 70b,100b + .llong 71b,100b + .llong 72b,100b + .llong 73b,100b + .llong 74b,100b + .llong 75b,100b + .llong 76b,100b + .llong 77b,100b + .llong 78b,100b + .llong 79b,100b + .llong 80b,100b + .llong 81b,100b + .llong 82b,100b + .llong 83b,100b + .llong 84b,100b + .llong 85b,100b + .llong 86b,100b + .llong 87b,100b + .llong 88b,100b + .llong 89b,100b + .llong 90b,100b + .llong 91b,100b |