--- /dev/null
+/*
+ * 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
git://git.onelab.eu / linux-2.6.git / blobdiff