| /* |
| * 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 |
| PPC_MTOCRF 0x01,r5 |
| blt cr1,.Lshort_copy |
| /* Below we want to nop out the bne if we're on a CPU that has the |
| * CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit |
| * cleared. |
| * At the time of writing the only CPU that has this combination of bits |
| * set is Power6. |
| */ |
| BEGIN_FTR_SECTION |
| nop |
| FTR_SECTION_ELSE |
| bne .Ldst_unaligned |
| ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \ |
| CPU_FTR_UNALIGNED_LD_STD) |
| .Ldst_aligned: |
| addi r3,r3,-16 |
| BEGIN_FTR_SECTION |
| andi. r0,r4,7 |
| bne .Lsrc_unaligned |
| END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD) |
| 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 |
| .Ldo_tail: |
| bf cr7*4+1,1f |
| 23: lwz r9,8(r4) |
| addi r4,r4,4 |
| 73: stw r9,0(r3) |
| addi r3,r3,4 |
| 1: bf cr7*4+2,2f |
| 44: lhz r9,8(r4) |
| addi r4,r4,2 |
| 74: sth r9,0(r3) |
| addi r3,r3,2 |
| 2: bf cr7*4+3,3f |
| 45: lbz r9,8(r4) |
| 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 cr1,7f |
| 34: ld r0,8(r4) |
| srd r7,r0,r11 |
| or r9,r7,r9 |
| 7: |
| bf cr7*4+1,1f |
| rotldi r9,r9,32 |
| 94: stw r9,0(r3) |
| addi r3,r3,4 |
| 1: bf cr7*4+2,2f |
| rotldi r9,r9,16 |
| 95: sth r9,0(r3) |
| addi r3,r3,2 |
| 2: bf cr7*4+3,3f |
| rotldi r9,r9,8 |
| 96: stb r9,0(r3) |
| 3: li r3,0 |
| blr |
| |
| .Ldst_unaligned: |
| PPC_MTOCRF 0x01,r6 /* put #bytes to 8B bdry into cr7 */ |
| subf r5,r6,r5 |
| li r7,0 |
| cmpldi cr1,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: PPC_MTOCRF 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 |
| 134: |
| 135: |
| 138: |
| 139: |
| 140: |
| 141: |
| 142: |
| 123: |
| 144: |
| 145: |
| |
| /* |
| * 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: |
| 194: |
| 195: |
| 196: |
| 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 44b,144b |
| .llong 74b,174b |
| .llong 45b,145b |
| .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 94b,194b |
| .llong 95b,195b |
| .llong 96b,196b |
| .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 |
