[PATCH] powerpc: Move arch/ppc*/kernel/vecemu.c to arch/powerpc

This file is the same in both architectures so create arch/powerpc/kernel
and move it there.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/ppc/kernel/Makefile

@@ -36,3 +36,5 @@ ifndef CONFIG_MATH_EMULATION
 obj-$(CONFIG_8xx)		+= softemu8xx.o
 endif
 
+# These are here while we do the architecture merge
+vecemu-y			+= ../../powerpc/kernel/vecemu.o

arch/ppc64/kernel/Makefile

@@ -83,3 +83,6 @@ ifeq ($(CONFIG_PPC_ISERIES),y)
 arch/ppc64/kernel/head.o: arch/ppc64/kernel/lparmap.s
 AFLAGS_head.o += -Iarch/ppc64/kernel
 endif
+
+# These are here while we do the architecture merge
+vecemu-y			+= ../../powerpc/kernel/vecemu.o

arch/ppc64/kernel/vecemu.c

-/*
- * Routines to emulate some Altivec/VMX instructions, specifically
- * those that can trap when given denormalized operands in Java mode.
- */
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <asm/ptrace.h>
-#include <asm/processor.h>
-#include <asm/uaccess.h>
-
-/* Functions in vector.S */
-extern void vaddfp(vector128 *dst, vector128 *a, vector128 *b);
-extern void vsubfp(vector128 *dst, vector128 *a, vector128 *b);
-extern void vmaddfp(vector128 *dst, vector128 *a, vector128 *b, vector128 *c);
-extern void vnmsubfp(vector128 *dst, vector128 *a, vector128 *b, vector128 *c);
-extern void vrefp(vector128 *dst, vector128 *src);
-extern void vrsqrtefp(vector128 *dst, vector128 *src);
-extern void vexptep(vector128 *dst, vector128 *src);
-
-static unsigned int exp2s[8] = {
-	0x800000,
-	0x8b95c2,
-	0x9837f0,
-	0xa5fed7,
-	0xb504f3,
-	0xc5672a,
-	0xd744fd,
-	0xeac0c7
-};
-
-/*
- * Computes an estimate of 2^x.  The `s' argument is the 32-bit
- * single-precision floating-point representation of x.
- */
-static unsigned int eexp2(unsigned int s)
-{
-	int exp, pwr;
-	unsigned int mant, frac;
-
-	/* extract exponent field from input */
-	exp = ((s >> 23) & 0xff) - 127;
-	if (exp > 7) {
-		/* check for NaN input */
-		if (exp == 128 && (s & 0x7fffff) != 0)
-			return s | 0x400000;	/* return QNaN */
-		/* 2^-big = 0, 2^+big = +Inf */
-		return (s & 0x80000000)? 0: 0x7f800000;	/* 0 or +Inf */
-	}
-	if (exp < -23)
-		return 0x3f800000;	/* 1.0 */
-
-	/* convert to fixed point integer in 9.23 representation */
-	pwr = (s & 0x7fffff) | 0x800000;
-	if (exp > 0)
-		pwr <<= exp;
-	else
-		pwr >>= -exp;
-	if (s & 0x80000000)
-		pwr = -pwr;
-
-	/* extract integer part, which becomes exponent part of result */
-	exp = (pwr >> 23) + 126;
-	if (exp >= 254)
-		return 0x7f800000;
-	if (exp < -23)
-		return 0;
-
-	/* table lookup on top 3 bits of fraction to get mantissa */
-	mant = exp2s[(pwr >> 20) & 7];
-
-	/* linear interpolation using remaining 20 bits of fraction */
-	asm("mulhwu %0,%1,%2" : "=r" (frac)
-	    : "r" (pwr << 12), "r" (0x172b83ff));
-	asm("mulhwu %0,%1,%2" : "=r" (frac) : "r" (frac), "r" (mant));
-	mant += frac;
-
-	if (exp >= 0)
-		return mant + (exp << 23);
-
-	/* denormalized result */
-	exp = -exp;
-	mant += 1 << (exp - 1);
-	return mant >> exp;
-}
-
-/*
- * Computes an estimate of log_2(x).  The `s' argument is the 32-bit
- * single-precision floating-point representation of x.
- */
-static unsigned int elog2(unsigned int s)
-{
-	int exp, mant, lz, frac;
-
-	exp = s & 0x7f800000;
-	mant = s & 0x7fffff;
-	if (exp == 0x7f800000) {	/* Inf or NaN */
-		if (mant != 0)
-			s |= 0x400000;	/* turn NaN into QNaN */
-		return s;
-	}
-	if ((exp | mant) == 0)		/* +0 or -0 */
-		return 0xff800000;	/* return -Inf */
-
-	if (exp == 0) {
-		/* denormalized */
-		asm("cntlzw %0,%1" : "=r" (lz) : "r" (mant));
-		mant <<= lz - 8;
-		exp = (-118 - lz) << 23;
-	} else {
-		mant |= 0x800000;
-		exp -= 127 << 23;
-	}
-
-	if (mant >= 0xb504f3) {				/* 2^0.5 * 2^23 */
-		exp |= 0x400000;			/* 0.5 * 2^23 */
-		asm("mulhwu %0,%1,%2" : "=r" (mant)
-		    : "r" (mant), "r" (0xb504f334));	/* 2^-0.5 * 2^32 */
-	}
-	if (mant >= 0x9837f0) {				/* 2^0.25 * 2^23 */
-		exp |= 0x200000;			/* 0.25 * 2^23 */
-		asm("mulhwu %0,%1,%2" : "=r" (mant)
-		    : "r" (mant), "r" (0xd744fccb));	/* 2^-0.25 * 2^32 */
-	}
-	if (mant >= 0x8b95c2) {				/* 2^0.125 * 2^23 */
-		exp |= 0x100000;			/* 0.125 * 2^23 */
-		asm("mulhwu %0,%1,%2" : "=r" (mant)
-		    : "r" (mant), "r" (0xeac0c6e8));	/* 2^-0.125 * 2^32 */
-	}
-	if (mant > 0x800000) {				/* 1.0 * 2^23 */
-		/* calculate (mant - 1) * 1.381097463 */
-		/* 1.381097463 == 0.125 / (2^0.125 - 1) */
-		asm("mulhwu %0,%1,%2" : "=r" (frac)
-		    : "r" ((mant - 0x800000) << 1), "r" (0xb0c7cd3a));
-		exp += frac;
-	}
-	s = exp & 0x80000000;
-	if (exp != 0) {
-		if (s)
-			exp = -exp;
-		asm("cntlzw %0,%1" : "=r" (lz) : "r" (exp));
-		lz = 8 - lz;
-		if (lz > 0)
-			exp >>= lz;
-		else if (lz < 0)
-			exp <<= -lz;
-		s += ((lz + 126) << 23) + exp;
-	}
-	return s;
-}
-
-#define VSCR_SAT	1
-
-static int ctsxs(unsigned int x, int scale, unsigned int *vscrp)
-{
-	int exp, mant;
-
-	exp = (x >> 23) & 0xff;
-	mant = x & 0x7fffff;
-	if (exp == 255 && mant != 0)
-		return 0;		/* NaN -> 0 */
-	exp = exp - 127 + scale;
-	if (exp < 0)
-		return 0;		/* round towards zero */
-	if (exp >= 31) {
-		/* saturate, unless the result would be -2^31 */
-		if (x + (scale << 23) != 0xcf000000)
-			*vscrp |= VSCR_SAT;
-		return (x & 0x80000000)? 0x80000000: 0x7fffffff;
-	}
-	mant |= 0x800000;
-	mant = (mant << 7) >> (30 - exp);
-	return (x & 0x80000000)? -mant: mant;
-}
-
-static unsigned int ctuxs(unsigned int x, int scale, unsigned int *vscrp)
-{
-	int exp;
-	unsigned int mant;
-
-	exp = (x >> 23) & 0xff;
-	mant = x & 0x7fffff;
-	if (exp == 255 && mant != 0)
-		return 0;		/* NaN -> 0 */
-	exp = exp - 127 + scale;
-	if (exp < 0)
-		return 0;		/* round towards zero */
-	if (x & 0x80000000) {
-		/* negative => saturate to 0 */
-		*vscrp |= VSCR_SAT;
-		return 0;
-	}
-	if (exp >= 32) {
-		/* saturate */
-		*vscrp |= VSCR_SAT;
-		return 0xffffffff;
-	}
-	mant |= 0x800000;
-	mant = (mant << 8) >> (31 - exp);
-	return mant;
-}
-
-/* Round to floating integer, towards 0 */
-static unsigned int rfiz(unsigned int x)
-{
-	int exp;
-
-	exp = ((x >> 23) & 0xff) - 127;
-	if (exp == 128 && (x & 0x7fffff) != 0)
-		return x | 0x400000;	/* NaN -> make it a QNaN */
-	if (exp >= 23)
-		return x;		/* it's an integer already (or Inf) */
-	if (exp < 0)
-		return x & 0x80000000;	/* |x| < 1.0 rounds to 0 */
-	return x & ~(0x7fffff >> exp);
-}
-
-/* Round to floating integer, towards +/- Inf */
-static unsigned int rfii(unsigned int x)
-{
-	int exp, mask;
-
-	exp = ((x >> 23) & 0xff) - 127;
-	if (exp == 128 && (x & 0x7fffff) != 0)
-		return x | 0x400000;	/* NaN -> make it a QNaN */
-	if (exp >= 23)
-		return x;		/* it's an integer already (or Inf) */
-	if ((x & 0x7fffffff) == 0)
-		return x;		/* +/-0 -> +/-0 */
-	if (exp < 0)
-		/* 0 < |x| < 1.0 rounds to +/- 1.0 */
-		return (x & 0x80000000) | 0x3f800000;
-	mask = 0x7fffff >> exp;
-	/* mantissa overflows into exponent - that's OK,
-	   it can't overflow into the sign bit */
-	return (x + mask) & ~mask;
-}
-
-/* Round to floating integer, to nearest */
-static unsigned int rfin(unsigned int x)
-{
-	int exp, half;
-
-	exp = ((x >> 23) & 0xff) - 127;
-	if (exp == 128 && (x & 0x7fffff) != 0)
-		return x | 0x400000;	/* NaN -> make it a QNaN */
-	if (exp >= 23)
-		return x;		/* it's an integer already (or Inf) */
-	if (exp < -1)
-		return x & 0x80000000;	/* |x| < 0.5 -> +/-0 */
-	if (exp == -1)
-		/* 0.5 <= |x| < 1.0 rounds to +/- 1.0 */
-		return (x & 0x80000000) | 0x3f800000;
-	half = 0x400000 >> exp;
-	/* add 0.5 to the magnitude and chop off the fraction bits */
-	return (x + half) & ~(0x7fffff >> exp);
-}
-
-int
-emulate_altivec(struct pt_regs *regs)
-{
-	unsigned int instr, i;
-	unsigned int va, vb, vc, vd;
-	vector128 *vrs;
-
-	if (get_user(instr, (unsigned int __user *) regs->nip))
-		return -EFAULT;
-	if ((instr >> 26) != 4)
-		return -EINVAL;		/* not an altivec instruction */
-	vd = (instr >> 21) & 0x1f;
-	va = (instr >> 16) & 0x1f;
-	vb = (instr >> 11) & 0x1f;
-	vc = (instr >> 6) & 0x1f;
-
-	vrs = current->thread.vr;
-	switch (instr & 0x3f) {
-	case 10:
-		switch (vc) {
-		case 0:	/* vaddfp */
-			vaddfp(&vrs[vd], &vrs[va], &vrs[vb]);
-			break;
-		case 1:	/* vsubfp */
-			vsubfp(&vrs[vd], &vrs[va], &vrs[vb]);
-			break;
-		case 4:	/* vrefp */
-			vrefp(&vrs[vd], &vrs[vb]);
-			break;
-		case 5:	/* vrsqrtefp */
-			vrsqrtefp(&vrs[vd], &vrs[vb]);
-			break;
-		case 6:	/* vexptefp */
-			for (i = 0; i < 4; ++i)
-				vrs[vd].u[i] = eexp2(vrs[vb].u[i]);
-			break;
-		case 7:	/* vlogefp */
-			for (i = 0; i < 4; ++i)
-				vrs[vd].u[i] = elog2(vrs[vb].u[i]);
-			break;
-		case 8:		/* vrfin */
-			for (i = 0; i < 4; ++i)
-				vrs[vd].u[i] = rfin(vrs[vb].u[i]);
-			break;
-		case 9:		/* vrfiz */
-			for (i = 0; i < 4; ++i)
-				vrs[vd].u[i] = rfiz(vrs[vb].u[i]);
-			break;
-		case 10:	/* vrfip */
-			for (i = 0; i < 4; ++i) {
-				u32 x = vrs[vb].u[i];
-				x = (x & 0x80000000)? rfiz(x): rfii(x);
-				vrs[vd].u[i] = x;
-			}
-			break;
-		case 11:	/* vrfim */
-			for (i = 0; i < 4; ++i) {
-				u32 x = vrs[vb].u[i];
-				x = (x & 0x80000000)? rfii(x): rfiz(x);
-				vrs[vd].u[i] = x;
-			}
-			break;
-		case 14:	/* vctuxs */
-			for (i = 0; i < 4; ++i)
-				vrs[vd].u[i] = ctuxs(vrs[vb].u[i], va,
-						&current->thread.vscr.u[3]);
-			break;
-		case 15:	/* vctsxs */
-			for (i = 0; i < 4; ++i)
-				vrs[vd].u[i] = ctsxs(vrs[vb].u[i], va,
-						&current->thread.vscr.u[3]);
-			break;
-		default:
-			return -EINVAL;
-		}
-		break;
-	case 46:	/* vmaddfp */
-		vmaddfp(&vrs[vd], &vrs[va], &vrs[vb], &vrs[vc]);
-		break;
-	case 47:	/* vnmsubfp */
-		vnmsubfp(&vrs[vd], &vrs[va], &vrs[vb], &vrs[vc]);
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	return 0;
-}