patch-2.4.21 linux-2.4.21/arch/ppc64/lib/copyuser.S

• Lines: 565
• Date: 2003-06-13 07:51:32.000000000 -0700
• Orig file: linux-2.4.20/arch/ppc64/lib/copyuser.S
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/arch/ppc64/lib/copyuser.S linux-2.4.21/arch/ppc64/lib/copyuser.S
@@ -0,0 +1,564 @@
+/*
+ * 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.tmpl>
+
+	.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
+	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
+	blt	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:
+	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	r3,-24(r1)
+	ld	r4,-24(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