Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus

7 files changed, 187 insertions, 273 deletions

diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 99c550632d4..aa5818a0d88 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -70,7 +70,7 @@ static int fpux_emu(struct pt_regs *,
 
 /* Further private data for which no space exists in mips_fpu_soft_struct */
 
-struct mips_fpu_emulator_private fpuemuprivate;
+struct mips_fpu_emulator_stats fpuemustats;
 
 /* Control registers */
 
@@ -79,7 +79,17 @@ struct mips_fpu_emulator_private fpuemuprivate;
 
 /* Convert Mips rounding mode (0..3) to IEEE library modes. */
 static const unsigned char ieee_rm[4] = {
-	IEEE754_RN, IEEE754_RZ, IEEE754_RU, IEEE754_RD
+	[FPU_CSR_RN] = IEEE754_RN,
+	[FPU_CSR_RZ] = IEEE754_RZ,
+	[FPU_CSR_RU] = IEEE754_RU,
+	[FPU_CSR_RD] = IEEE754_RD,
+};
+/* Convert IEEE library modes to Mips rounding mode (0..3). */
+static const unsigned char mips_rm[4] = {
+	[IEEE754_RN] = FPU_CSR_RN,
+	[IEEE754_RZ] = FPU_CSR_RZ,
+	[IEEE754_RD] = FPU_CSR_RD,
+	[IEEE754_RU] = FPU_CSR_RU,
 };
 
 #if __mips >= 4
@@ -196,11 +206,11 @@ static int isBranchInstr(mips_instruction * i)
 static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 {
 	mips_instruction ir;
-	vaddr_t emulpc, contpc;
+	void * emulpc, *contpc;
 	unsigned int cond;
 
-	if (get_user(ir, (mips_instruction *) xcp->cp0_epc)) {
-		fpuemuprivate.stats.errors++;
+	if (get_user(ir, (mips_instruction __user *) xcp->cp0_epc)) {
+		fpuemustats.errors++;
 		return SIGBUS;
 	}
 
@@ -221,41 +231,39 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 		 * Linux MIPS branch emulator operates on context, updating the
 		 * cp0_epc.
 		 */
-		emulpc = REG_TO_VA(xcp->cp0_epc + 4);	/* Snapshot emulation target */
+		emulpc = (void *) (xcp->cp0_epc + 4);	/* Snapshot emulation target */
 
 		if (__compute_return_epc(xcp)) {
 #ifdef CP1DBG
 			printk("failed to emulate branch at %p\n",
-				REG_TO_VA(xcp->cp0_epc));
+				(void *) (xcp->cp0_epc));
 #endif
 			return SIGILL;
 		}
-		if (get_user(ir, (mips_instruction *) emulpc)) {
-			fpuemuprivate.stats.errors++;
+		if (get_user(ir, (mips_instruction __user *) emulpc)) {
+			fpuemustats.errors++;
 			return SIGBUS;
 		}
 		/* __compute_return_epc() will have updated cp0_epc */
-		contpc = REG_TO_VA xcp->cp0_epc;
+		contpc = (void *)  xcp->cp0_epc;
 		/* In order not to confuse ptrace() et al, tweak context */
-		xcp->cp0_epc = VA_TO_REG emulpc - 4;
-	}
-	else {
-		emulpc = REG_TO_VA xcp->cp0_epc;
-		contpc = REG_TO_VA(xcp->cp0_epc + 4);
+		xcp->cp0_epc = (unsigned long) emulpc - 4;
+	} else {
+		emulpc = (void *)  xcp->cp0_epc;
+		contpc = (void *) (xcp->cp0_epc + 4);
 	}
 
       emul:
-	fpuemuprivate.stats.emulated++;
+	fpuemustats.emulated++;
 	switch (MIPSInst_OPCODE(ir)) {
-#ifndef SINGLE_ONLY_FPU
 	case ldc1_op:{
-		u64 *va = REG_TO_VA(xcp->regs[MIPSInst_RS(ir)] +
+		u64 __user *va = (u64 __user *) (xcp->regs[MIPSInst_RS(ir)] +
 			MIPSInst_SIMM(ir));
 		u64 val;
 
-		fpuemuprivate.stats.loads++;
+		fpuemustats.loads++;
 		if (get_user(val, va)) {
-			fpuemuprivate.stats.errors++;
+			fpuemustats.errors++;
 			return SIGBUS;
 		}
 		DITOREG(val, MIPSInst_RT(ir));
@@ -263,55 +271,42 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 	}
 
 	case sdc1_op:{
-		u64 *va = REG_TO_VA(xcp->regs[MIPSInst_RS(ir)] +
+		u64 __user *va = (u64 __user *) (xcp->regs[MIPSInst_RS(ir)] +
 			MIPSInst_SIMM(ir));
 		u64 val;
 
-		fpuemuprivate.stats.stores++;
+		fpuemustats.stores++;
 		DIFROMREG(val, MIPSInst_RT(ir));
 		if (put_user(val, va)) {
-			fpuemuprivate.stats.errors++;
+			fpuemustats.errors++;
 			return SIGBUS;
 		}
 		break;
 	}
-#endif
 
 	case lwc1_op:{
-		u32 *va = REG_TO_VA(xcp->regs[MIPSInst_RS(ir)] +
+		u32 __user *va = (u32 __user *) (xcp->regs[MIPSInst_RS(ir)] +
 			MIPSInst_SIMM(ir));
 		u32 val;
 
-		fpuemuprivate.stats.loads++;
+		fpuemustats.loads++;
 		if (get_user(val, va)) {
-			fpuemuprivate.stats.errors++;
+			fpuemustats.errors++;
 			return SIGBUS;
 		}
-#ifdef SINGLE_ONLY_FPU
-		if (MIPSInst_RT(ir) & 1) {
-			/* illegal register in single-float mode */
-			return SIGILL;
-		}
-#endif
 		SITOREG(val, MIPSInst_RT(ir));
 		break;
 	}
 
 	case swc1_op:{
-		u32 *va = REG_TO_VA(xcp->regs[MIPSInst_RS(ir)] +
+		u32 __user *va = (u32 __user *) (xcp->regs[MIPSInst_RS(ir)] +
 			MIPSInst_SIMM(ir));
 		u32 val;
 
-		fpuemuprivate.stats.stores++;
-#ifdef SINGLE_ONLY_FPU
-		if (MIPSInst_RT(ir) & 1) {
-			/* illegal register in single-float mode */
-			return SIGILL;
-		}
-#endif
+		fpuemustats.stores++;
 		SIFROMREG(val, MIPSInst_RT(ir));
 		if (put_user(val, va)) {
-			fpuemuprivate.stats.errors++;
+			fpuemustats.errors++;
 			return SIGBUS;
 		}
 		break;
@@ -320,7 +315,7 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 	case cop1_op:
 		switch (MIPSInst_RS(ir)) {
 
-#if defined(__mips64) && !defined(SINGLE_ONLY_FPU)
+#if defined(__mips64)
 		case dmfc_op:
 			/* copregister fs -> gpr[rt] */
 			if (MIPSInst_RT(ir) != 0) {
@@ -337,12 +332,6 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 
 		case mfc_op:
 			/* copregister rd -> gpr[rt] */
-#ifdef SINGLE_ONLY_FPU
-			if (MIPSInst_RD(ir) & 1) {
-				/* illegal register in single-float mode */
-				return SIGILL;
-			}
-#endif
 			if (MIPSInst_RT(ir) != 0) {
 				SIFROMREG(xcp->regs[MIPSInst_RT(ir)],
 					MIPSInst_RD(ir));
@@ -351,12 +340,6 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 
 		case mtc_op:
 			/* copregister rd <- rt */
-#ifdef SINGLE_ONLY_FPU
-			if (MIPSInst_RD(ir) & 1) {
-				/* illegal register in single-float mode */
-				return SIGILL;
-			}
-#endif
 			SITOREG(xcp->regs[MIPSInst_RT(ir)], MIPSInst_RD(ir));
 			break;
 
@@ -369,9 +352,10 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 			}
 			if (MIPSInst_RD(ir) == FPCREG_CSR) {
 				value = ctx->fcr31;
+				value = (value & ~0x3) | mips_rm[value & 0x3];
 #ifdef CSRTRACE
 				printk("%p gpr[%d]<-csr=%08x\n",
-					REG_TO_VA(xcp->cp0_epc),
+					(void *) (xcp->cp0_epc),
 					MIPSInst_RT(ir), value);
 #endif
 			}
@@ -398,14 +382,13 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 			if (MIPSInst_RD(ir) == FPCREG_CSR) {
 #ifdef CSRTRACE
 				printk("%p gpr[%d]->csr=%08x\n",
-					REG_TO_VA(xcp->cp0_epc),
+					(void *) (xcp->cp0_epc),
 					MIPSInst_RT(ir), value);
 #endif
-				ctx->fcr31 = value;
-				/* copy new rounding mode and
-				   flush bit to ieee library state! */
-				ieee754_csr.nod = (ctx->fcr31 & 0x1000000) != 0;
-				ieee754_csr.rm = ieee_rm[value & 0x3];
+				value &= (FPU_CSR_FLUSH | FPU_CSR_ALL_E | FPU_CSR_ALL_S | 0x03);
+				ctx->fcr31 &= ~(FPU_CSR_FLUSH | FPU_CSR_ALL_E | FPU_CSR_ALL_S | 0x03);
+				/* convert to ieee library modes */
+				ctx->fcr31 |= (value & ~0x3) | ieee_rm[value & 0x3];
 			}
 			if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) {
 				return SIGFPE;
@@ -445,20 +428,20 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 				 * instruction
 				 */
 				xcp->cp0_epc += 4;
-				contpc = REG_TO_VA
+				contpc = (void *)
 					(xcp->cp0_epc +
 					(MIPSInst_SIMM(ir) << 2));
 
-				if (get_user(ir, (mips_instruction *)
-						REG_TO_VA xcp->cp0_epc)) {
-					fpuemuprivate.stats.errors++;
+				if (get_user(ir,
+				    (mips_instruction __user *) xcp->cp0_epc)) {
+					fpuemustats.errors++;
 					return SIGBUS;
 				}
 
 				switch (MIPSInst_OPCODE(ir)) {
 				case lwc1_op:
 				case swc1_op:
-#if (__mips >= 2 || __mips64) && !defined(SINGLE_ONLY_FPU)
+#if (__mips >= 2 || defined(__mips64))
 				case ldc1_op:
 				case sdc1_op:
 #endif
@@ -480,7 +463,7 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 				 * Single step the non-cp1
 				 * instruction in the dslot
 				 */
-				return mips_dsemul(xcp, ir, VA_TO_REG contpc);
+				return mips_dsemul(xcp, ir, (unsigned long) contpc);
 			}
 			else {
 				/* branch not taken */
@@ -539,8 +522,9 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
 	}
 
 	/* we did it !! */
-	xcp->cp0_epc = VA_TO_REG(contpc);
+	xcp->cp0_epc = (unsigned long) contpc;
 	xcp->cp0_cause &= ~CAUSEF_BD;
+
 	return 0;
 }
 
@@ -570,7 +554,7 @@ static const unsigned char cmptab[8] = {
 static ieee754##p fpemu_##p##_##name (ieee754##p r, ieee754##p s, \
     ieee754##p t) \
 { \
-	struct ieee754_csr ieee754_csr_save; \
+	struct _ieee754_csr ieee754_csr_save; \
 	s = f1 (s, t); \
 	ieee754_csr_save = ieee754_csr; \
 	s = f2 (s, r); \
@@ -616,54 +600,38 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 {
 	unsigned rcsr = 0;	/* resulting csr */
 
-	fpuemuprivate.stats.cp1xops++;
+	fpuemustats.cp1xops++;
 
 	switch (MIPSInst_FMA_FFMT(ir)) {
 	case s_fmt:{		/* 0 */
 
 		ieee754sp(*handler) (ieee754sp, ieee754sp, ieee754sp);
 		ieee754sp fd, fr, fs, ft;
-		u32 *va;
+		u32 __user *va;
 		u32 val;
 
 		switch (MIPSInst_FUNC(ir)) {
 		case lwxc1_op:
-			va = REG_TO_VA(xcp->regs[MIPSInst_FR(ir)] +
+			va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] +
 				xcp->regs[MIPSInst_FT(ir)]);
 
-			fpuemuprivate.stats.loads++;
+			fpuemustats.loads++;
 			if (get_user(val, va)) {
-				fpuemuprivate.stats.errors++;
+				fpuemustats.errors++;
 				return SIGBUS;
 			}
-#ifdef SINGLE_ONLY_FPU
-			if (MIPSInst_FD(ir) & 1) {
-				/* illegal register in single-float
-				 * mode
-				 */
-				return SIGILL;
-			}
-#endif
 			SITOREG(val, MIPSInst_FD(ir));
 			break;
 
 		case swxc1_op:
-			va = REG_TO_VA(xcp->regs[MIPSInst_FR(ir)] +
+			va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] +
 				xcp->regs[MIPSInst_FT(ir)]);
 
-			fpuemuprivate.stats.stores++;
-#ifdef SINGLE_ONLY_FPU
-			if (MIPSInst_FS(ir) & 1) {
-				/* illegal register in single-float
-				 * mode
-				 */
-				return SIGILL;
-			}
-#endif
+			fpuemustats.stores++;
 
 			SIFROMREG(val, MIPSInst_FS(ir));
 			if (put_user(val, va)) {
-				fpuemuprivate.stats.errors++;
+				fpuemustats.errors++;
 				return SIGBUS;
 			}
 			break;
@@ -699,8 +667,6 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 				rcsr |= FPU_CSR_INV_X | FPU_CSR_INV_S;
 
 			ctx->fcr31 = (ctx->fcr31 & ~FPU_CSR_ALL_X) | rcsr;
-			if (ieee754_csr.nod)
-				ctx->fcr31 |= 0x1000000;
 			if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) {
 				/*printk ("SIGFPE: fpu csr = %08x\n",
 				   ctx->fcr31); */
@@ -715,34 +681,33 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 		break;
 	}
 
-#ifndef SINGLE_ONLY_FPU
 	case d_fmt:{		/* 1 */
 		ieee754dp(*handler) (ieee754dp, ieee754dp, ieee754dp);
 		ieee754dp fd, fr, fs, ft;
-		u64 *va;
+		u64 __user *va;
 		u64 val;
 
 		switch (MIPSInst_FUNC(ir)) {
 		case ldxc1_op:
-			va = REG_TO_VA(xcp->regs[MIPSInst_FR(ir)] +
+			va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] +
 				xcp->regs[MIPSInst_FT(ir)]);
 
-			fpuemuprivate.stats.loads++;
+			fpuemustats.loads++;
 			if (get_user(val, va)) {
-				fpuemuprivate.stats.errors++;
+				fpuemustats.errors++;
 				return SIGBUS;
 			}
 			DITOREG(val, MIPSInst_FD(ir));
 			break;
 
 		case sdxc1_op:
-			va = REG_TO_VA(xcp->regs[MIPSInst_FR(ir)] +
+			va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] +
 				xcp->regs[MIPSInst_FT(ir)]);
 
-			fpuemuprivate.stats.stores++;
+			fpuemustats.stores++;
 			DIFROMREG(val, MIPSInst_FS(ir));
 			if (put_user(val, va)) {
-				fpuemuprivate.stats.errors++;
+				fpuemustats.errors++;
 				return SIGBUS;
 			}
 			break;
@@ -773,7 +738,6 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 		}
 		break;
 	}
-#endif
 
 	case 0x7:		/* 7 */
 		if (MIPSInst_FUNC(ir) != pfetch_op) {
@@ -810,7 +774,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 #endif
 	} rv;			/* resulting value */
 
-	fpuemuprivate.stats.cp1ops++;
+	fpuemustats.cp1ops++;
 	switch (rfmt = (MIPSInst_FFMT(ir) & 0xf)) {
 	case s_fmt:{		/* 0 */
 		union {
@@ -834,7 +798,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			goto scopbop;
 
 			/* unary  ops */
-#if __mips >= 2 || __mips64
+#if __mips >= 2 || defined(__mips64)
 		case fsqrt_op:
 			handler.u = ieee754sp_sqrt;
 			goto scopuop;
@@ -913,9 +877,6 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 		case fcvts_op:
 			return SIGILL;	/* not defined */
 		case fcvtd_op:{
-#ifdef SINGLE_ONLY_FPU
-			return SIGILL;	/* not defined */
-#else
 			ieee754sp fs;
 
 			SPFROMREG(fs, MIPSInst_FS(ir));
@@ -923,7 +884,6 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			rfmt = d_fmt;
 			goto copcsr;
 		}
-#endif
 		case fcvtw_op:{
 			ieee754sp fs;
 
@@ -933,7 +893,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			goto copcsr;
 		}
 
-#if __mips >= 2 || __mips64
+#if __mips >= 2 || defined(__mips64)
 		case fround_op:
 		case ftrunc_op:
 		case fceil_op:
@@ -950,7 +910,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 		}
 #endif /* __mips >= 2 */
 
-#if defined(__mips64) && !defined(SINGLE_ONLY_FPU)
+#if defined(__mips64)
 		case fcvtl_op:{
 			ieee754sp fs;
 
@@ -974,7 +934,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			rfmt = l_fmt;
 			goto copcsr;
 		}
-#endif /* __mips64 && !fpu(single) */
+#endif /* defined(__mips64) */
 
 		default:
 			if (MIPSInst_FUNC(ir) >= fcmp_op) {
@@ -1001,7 +961,6 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 		break;
 	}
 
-#ifndef SINGLE_ONLY_FPU
 	case d_fmt:{
 		union {
 			ieee754dp(*b) (ieee754dp, ieee754dp);
@@ -1024,7 +983,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			goto dcopbop;
 
 			/* unary  ops */
-#if __mips >= 2 || __mips64
+#if __mips >= 2 || defined(__mips64)
 		case fsqrt_op:
 			handler.u = ieee754dp_sqrt;
 			goto dcopuop;
@@ -1108,7 +1067,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			goto copcsr;
 		}
 
-#if __mips >= 2 || __mips64
+#if __mips >= 2 || defined(__mips64)
 		case fround_op:
 		case ftrunc_op:
 		case fceil_op:
@@ -1125,7 +1084,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 		}
 #endif
 
-#if defined(__mips64) && !defined(SINGLE_ONLY_FPU)
+#if defined(__mips64)
 		case fcvtl_op:{
 			ieee754dp fs;
 
@@ -1149,7 +1108,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			rfmt = l_fmt;
 			goto copcsr;
 		}
-#endif /* __mips >= 3 && !fpu(single) */
+#endif /* __mips >= 3 */
 
 		default:
 			if (MIPSInst_FUNC(ir) >= fcmp_op) {
@@ -1177,7 +1136,6 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 		}
 		break;
 	}
-#endif /* ifndef SINGLE_ONLY_FPU */
 
 	case w_fmt:{
 		ieee754sp fs;
@@ -1189,21 +1147,19 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			rv.s = ieee754sp_fint(fs.bits);
 			rfmt = s_fmt;
 			goto copcsr;
-#ifndef SINGLE_ONLY_FPU
 		case fcvtd_op:
 			/* convert word to double precision real */
 			SPFROMREG(fs, MIPSInst_FS(ir));
 			rv.d = ieee754dp_fint(fs.bits);
 			rfmt = d_fmt;
 			goto copcsr;
-#endif
 		default:
 			return SIGILL;
 		}
 		break;
 	}
 
-#if defined(__mips64) && !defined(SINGLE_ONLY_FPU)
+#if defined(__mips64)
 	case l_fmt:{
 		switch (MIPSInst_FUNC(ir)) {
 		case fcvts_op:
@@ -1256,18 +1212,16 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 			ctx->fcr31 &= ~cond;
 		break;
 	}
-#ifndef SINGLE_ONLY_FPU
 	case d_fmt:
 		DPTOREG(rv.d, MIPSInst_FD(ir));
 		break;
-#endif
 	case s_fmt:
 		SPTOREG(rv.s, MIPSInst_FD(ir));
 		break;
 	case w_fmt:
 		SITOREG(rv.w, MIPSInst_FD(ir));
 		break;
-#if defined(__mips64) && !defined(SINGLE_ONLY_FPU)
+#if defined(__mips64)
 	case l_fmt:
 		DITOREG(rv.l, MIPSInst_FD(ir));
 		break;
@@ -1279,10 +1233,10 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
 	return 0;
 }
 
-int fpu_emulator_cop1Handler(int xcptno, struct pt_regs *xcp,
+int fpu_emulator_cop1Handler(struct pt_regs *xcp,
 	struct mips_fpu_soft_struct *ctx)
 {
-	gpreg_t oldepc, prevepc;
+	unsigned long oldepc, prevepc;
 	mips_instruction insn;
 	int sig = 0;
 
@@ -1290,19 +1244,24 @@ int fpu_emulator_cop1Handler(int xcptno, struct pt_regs *xcp,
 	do {
 		prevepc = xcp->cp0_epc;
 
-		if (get_user(insn, (mips_instruction *) xcp->cp0_epc)) {
-			fpuemuprivate.stats.errors++;
+		if (get_user(insn, (mips_instruction __user *) xcp->cp0_epc)) {
+			fpuemustats.errors++;
 			return SIGBUS;
 		}
 		if (insn == 0)
 			xcp->cp0_epc += 4;	/* skip nops */
 		else {
-			/* Update ieee754_csr. Only relevant if we have a
-			   h/w FPU */
-			ieee754_csr.nod = (ctx->fcr31 & 0x1000000) != 0;
-			ieee754_csr.rm = ieee_rm[ctx->fcr31 & 0x3];
-			ieee754_csr.cx = (ctx->fcr31 >> 12) & 0x1f;
+			/*
+			 * The 'ieee754_csr' is an alias of
+			 * ctx->fcr31.  No need to copy ctx->fcr31 to
+			 * ieee754_csr.  But ieee754_csr.rm is ieee
+			 * library modes. (not mips rounding mode)
+			 */
+			/* convert to ieee library modes */
+			ieee754_csr.rm = ieee_rm[ieee754_csr.rm];
 			sig = cop1Emulate(xcp, ctx);
+			/* revert to mips rounding mode */
+			ieee754_csr.rm = mips_rm[ieee754_csr.rm];
 		}
 
 		if (cpu_has_fpu)
diff --git a/arch/mips/math-emu/dp_sqrt.c b/arch/mips/math-emu/dp_sqrt.c
index c35e871ae97..032328c4988 100644
--- a/arch/mips/math-emu/dp_sqrt.c
+++ b/arch/mips/math-emu/dp_sqrt.c
@@ -37,7 +37,7 @@ static const unsigned table[] = {
 
 ieee754dp ieee754dp_sqrt(ieee754dp x)
 {
-	struct ieee754_csr oldcsr;
+	struct _ieee754_csr oldcsr;
 	ieee754dp y, z, t;
 	unsigned scalx, yh;
 	COMPXDP;
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
index aa989c2246d..8079f3d1eca 100644
--- a/arch/mips/math-emu/dsemul.c
+++ b/arch/mips/math-emu/dsemul.c
@@ -28,9 +28,6 @@
 #endif
 #define __mips 4
 
-extern struct mips_fpu_emulator_private fpuemuprivate;
-
-
 /*
  * Emulate the arbritrary instruction ir at xcp->cp0_epc.  Required when
  * we have to emulate the instruction in a COP1 branch delay slot.  Do
@@ -52,10 +49,10 @@ struct emuframe {
 	mips_instruction	emul;
 	mips_instruction	badinst;
 	mips_instruction	cookie;
-	gpreg_t			epc;
+	unsigned long		epc;
 };
 
-int mips_dsemul(struct pt_regs *regs, mips_instruction ir, gpreg_t cpc)
+int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 {
 	extern asmlinkage void handle_dsemulret(void);
 	mips_instruction *dsemul_insns;
@@ -91,7 +88,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, gpreg_t cpc)
 	 */
 
 	/* Ensure that the two instructions are in the same cache line */
-	dsemul_insns = (mips_instruction *) REG_TO_VA ((regs->regs[29] - sizeof(struct emuframe)) & ~0x7);
+	dsemul_insns = (mips_instruction *) ((regs->regs[29] - sizeof(struct emuframe)) & ~0x7);
 	fr = (struct emuframe *) dsemul_insns;
 
 	/* Verify that the stack pointer is not competely insane */
@@ -104,11 +101,11 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, gpreg_t cpc)
 	err |= __put_user(cpc, &fr->epc);
 
 	if (unlikely(err)) {
-		fpuemuprivate.stats.errors++;
+		fpuemustats.errors++;
 		return SIGBUS;
 	}
 
-	regs->cp0_epc = VA_TO_REG & fr->emul;
+	regs->cp0_epc = (unsigned long) &fr->emul;
 
 	flush_cache_sigtramp((unsigned long)&fr->badinst);
 
@@ -118,7 +115,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, gpreg_t cpc)
 int do_dsemulret(struct pt_regs *xcp)
 {
 	struct emuframe *fr;
-	gpreg_t epc;
+	unsigned long epc;
 	u32 insn, cookie;
 	int err = 0;
 
@@ -141,7 +138,7 @@ int do_dsemulret(struct pt_regs *xcp)
 	err |= __get_user(cookie, &fr->cookie);
 
 	if (unlikely(err || (insn != BADINST) || (cookie != BD_COOKIE))) {
-		fpuemuprivate.stats.errors++;
+		fpuemustats.errors++;
 		return 0;
 	}
 
diff --git a/arch/mips/math-emu/dsemul.h b/arch/mips/math-emu/dsemul.h
index dbd85f95268..091f0e76730 100644
--- a/arch/mips/math-emu/dsemul.h
+++ b/arch/mips/math-emu/dsemul.h
@@ -1,11 +1,5 @@
-typedef long gpreg_t;
-typedef void *vaddr_t;
-
-#define REG_TO_VA (vaddr_t)
-#define VA_TO_REG (gpreg_t)
-
-int mips_dsemul(struct pt_regs *regs, mips_instruction ir, gpreg_t cpc);
-int do_dsemulret(struct pt_regs *xcp);
+extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc);
+extern int do_dsemulret(struct pt_regs *xcp);
 
 /* Instruction which will always cause an address error */
 #define AdELOAD 0x8c000001	/* lw $0,1($0) */
diff --git a/arch/mips/math-emu/ieee754.c b/arch/mips/math-emu/ieee754.c
index f0a364adbf3..a93c45dbdef 100644
--- a/arch/mips/math-emu/ieee754.c
+++ b/arch/mips/math-emu/ieee754.c
@@ -31,6 +31,8 @@
 
 
 #include "ieee754int.h"
+#include "ieee754sp.h"
+#include "ieee754dp.h"
 
 #define DP_EBIAS	1023
 #define DP_EMIN		(-1022)
@@ -40,20 +42,6 @@
 #define SP_EMIN		(-126)
 #define SP_EMAX		127
 
-/* indexed by class */
-const char *const ieee754_cname[] = {
-	"Normal",
-	"Zero",
-	"Denormal",
-	"Infinity",
-	"QNaN",
-	"SNaN",
-};
-
-/* the control status register
-*/
-struct ieee754_csr ieee754_csr;
-
 /* special constants
 */
 
diff --git a/arch/mips/math-emu/ieee754.h b/arch/mips/math-emu/ieee754.h
index b8772f46972..171f177c0f8 100644
--- a/arch/mips/math-emu/ieee754.h
+++ b/arch/mips/math-emu/ieee754.h
@@ -1,13 +1,8 @@
-/* single and double precision fp ops
- * missing extended precision.
-*/
 /*
  * MIPS floating point support
  * Copyright (C) 1994-2000 Algorithmics Ltd.
  * http://www.algor.co.uk
  *
- * ########################################################################
- *
  *  This program is free software; you can distribute it and/or modify it
  *  under the terms of the GNU General Public License (Version 2) as
  *  published by the Free Software Foundation.
@@ -21,20 +16,18 @@
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  *
- * ########################################################################
- */
-
-/**************************************************************************
  *  Nov 7, 2000
  *  Modification to allow integration with Linux kernel
  *
  *  Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
  *  Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
- *************************************************************************/
+ */
+#ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H
+#define __ARCH_MIPS_MATH_EMU_IEEE754_H
 
-#ifdef __KERNEL__
-/* Going from Algorithmics to Linux native environment, add this */
+#include <asm/byteorder.h>
 #include <linux/types.h>
+#include <linux/sched.h>
 
 /*
  * Not very pretty, but the Linux kernel's normal va_list definition
@@ -44,18 +37,7 @@
 #include <stdarg.h>
 #endif
 
-#else
-
-/* Note that __KERNEL__ is taken to mean Linux kernel */
-
-#if #system(OpenBSD)
-#include <machine/types.h>
-#endif
-#include <machine/endian.h>
-
-#endif				/* __KERNEL__ */
-
-#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__)
+#ifdef __LITTLE_ENDIAN
 struct ieee754dp_konst {
 	unsigned mantlo:32;
 	unsigned manthi:20;
@@ -86,13 +68,14 @@ typedef union _ieee754sp {
 } ieee754sp;
 #endif
 
-#if (defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN) || defined(__MIPSEB__)
+#ifdef __BIG_ENDIAN
 struct ieee754dp_konst {
 	unsigned sign:1;
 	unsigned bexp:11;
 	unsigned manthi:20;
 	unsigned mantlo:32;
 };
+
 typedef union _ieee754dp {
 	struct ieee754dp_konst oparts;
 	struct {
@@ -222,7 +205,6 @@ ieee754dp ieee754dp_sqrt(ieee754dp x);
 #define IEEE754_CLASS_INF	0x03
 #define IEEE754_CLASS_SNAN	0x04
 #define IEEE754_CLASS_QNAN	0x05
-extern const char *const ieee754_cname[];
 
 /* exception numbers */
 #define IEEE754_INEXACT			0x01
@@ -251,93 +233,109 @@ extern const char *const ieee754_cname[];
 
 /* "normal" comparisons
 */
-static __inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
 {
 	return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
 {
 	return ieee754sp_cmp(x, y,
 			     IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
 }
 
-static __inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
 {
 	return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
 }
 
-static __inline int ieee754sp_le(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_le(ieee754sp x, ieee754sp y)
 {
 	return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
 {
 	return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
 }
 
 
-static __inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
 {
 	return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
 {
 	return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
 {
 	return ieee754dp_cmp(x, y,
 			     IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
 }
 
-static __inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
 {
 	return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
 }
 
-static __inline int ieee754dp_le(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_le(ieee754dp x, ieee754dp y)
 {
 	return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
 {
 	return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
 }
 
-static __inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
 {
 	return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
 }
 
 
-/* like strtod
-*/
+/*
+ * Like strtod
+ */
 ieee754dp ieee754dp_fstr(const char *s, char **endp);
 char *ieee754dp_tstr(ieee754dp x, int prec, int fmt, int af);
 
 
-/* the control status register
-*/
-struct ieee754_csr {
-	unsigned pad:13;
+/*
+ * The control status register
+ */
+struct _ieee754_csr {
+#ifdef __BIG_ENDIAN
+	unsigned pad0:7;
 	unsigned nod:1;		/* set 1 for no denormalised numbers */
-	unsigned cx:5;		/* exceptions this operation */
+	unsigned c:1;		/* condition */
+	unsigned pad1:5;
+	unsigned cx:6;		/* exceptions this operation */
 	unsigned mx:5;		/* exception enable  mask */
 	unsigned sx:5;		/* exceptions total */
 	unsigned rm:2;		/* current rounding mode */
+#endif
+#ifdef __LITTLE_ENDIAN
+	unsigned rm:2;		/* current rounding mode */
+	unsigned sx:5;		/* exceptions total */
+	unsigned mx:5;		/* exception enable  mask */
+	unsigned cx:6;		/* exceptions this operation */
+	unsigned pad1:5;
+	unsigned c:1;		/* condition */
+	unsigned nod:1;		/* set 1 for no denormalised numbers */
+	unsigned pad0:7;
+#endif
 };
-extern struct ieee754_csr ieee754_csr;
+#define ieee754_csr (*(struct _ieee754_csr *)(&current->thread.fpu.soft.fcr31))
 
-static __inline unsigned ieee754_getrm(void)
+static inline unsigned ieee754_getrm(void)
 {
 	return (ieee754_csr.rm);
 }
-static __inline unsigned ieee754_setrm(unsigned rm)
+static inline unsigned ieee754_setrm(unsigned rm)
 {
 	return (ieee754_csr.rm = rm);
 }
@@ -345,14 +343,14 @@ static __inline unsigned ieee754_setrm(unsigned rm)
 /*
  * get current exceptions
  */
-static __inline unsigned ieee754_getcx(void)
+static inline unsigned ieee754_getcx(void)
 {
 	return (ieee754_csr.cx);
 }
 
 /* test for current exception condition
  */
-static __inline int ieee754_cxtest(unsigned n)
+static inline int ieee754_cxtest(unsigned n)
 {
 	return (ieee754_csr.cx & n);
 }
@@ -360,21 +358,21 @@ static __inline int ieee754_cxtest(unsigned n)
 /*
  * get sticky exceptions
  */
-static __inline unsigned ieee754_getsx(void)
+static inline unsigned ieee754_getsx(void)
 {
 	return (ieee754_csr.sx);
 }
 
 /* clear sticky conditions
 */
-static __inline unsigned ieee754_clrsx(void)
+static inline unsigned ieee754_clrsx(void)
 {
 	return (ieee754_csr.sx = 0);
 }
 
 /* test for sticky exception condition
  */
-static __inline int ieee754_sxtest(unsigned n)
+static inline int ieee754_sxtest(unsigned n)
 {
 	return (ieee754_csr.sx & n);
 }
@@ -406,52 +404,34 @@ extern const struct ieee754sp_konst __ieee754sp_spcvals[];
 #define ieee754dp_spcvals ((const ieee754dp *)__ieee754dp_spcvals)
 #define ieee754sp_spcvals ((const ieee754sp *)__ieee754sp_spcvals)
 
-/* return infinity with given sign
-*/
-#define ieee754dp_inf(sn)	\
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
-#define ieee754dp_zero(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
-#define ieee754dp_one(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
-#define ieee754dp_ten(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
-#define ieee754dp_indef() \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
-#define ieee754dp_max(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
-#define ieee754dp_min(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
-#define ieee754dp_mind(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
-#define ieee754dp_1e31() \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
-#define ieee754dp_1e63() \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
-
-#define ieee754sp_inf(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
-#define ieee754sp_zero(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
-#define ieee754sp_one(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
-#define ieee754sp_ten(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
-#define ieee754sp_indef() \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
-#define ieee754sp_max(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
-#define ieee754sp_min(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
-#define ieee754sp_mind(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
-#define ieee754sp_1e31() \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
-#define ieee754sp_1e63() \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
-
-/* indefinite integer value
-*/
+/*
+ * Return infinity with given sign
+ */
+#define ieee754dp_inf(sn)     (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
+#define ieee754dp_zero(sn)	(ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
+#define ieee754dp_one(sn)	(ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
+#define ieee754dp_ten(sn)	(ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
+#define ieee754dp_indef()	(ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
+#define ieee754dp_max(sn)	(ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
+#define ieee754dp_min(sn)	(ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
+#define ieee754dp_mind(sn)	(ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
+#define ieee754dp_1e31()	(ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
+#define ieee754dp_1e63()	(ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
+
+#define ieee754sp_inf(sn)     (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
+#define ieee754sp_zero(sn)	(ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
+#define ieee754sp_one(sn)	(ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
+#define ieee754sp_ten(sn)	(ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
+#define ieee754sp_indef()	(ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
+#define ieee754sp_max(sn)	(ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
+#define ieee754sp_min(sn)	(ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
+#define ieee754sp_mind(sn)	(ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
+#define ieee754sp_1e31()	(ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
+#define ieee754sp_1e63()	(ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
+
+/*
+ * Indefinite integer value
+ */
 #define ieee754si_indef()	INT_MAX
 #ifdef LONG_LONG_MAX
 #define ieee754di_indef()	LONG_LONG_MAX
@@ -487,3 +467,5 @@ extern void ieee754_xcpt(struct ieee754xctx *xcp);
 /* compat */
 #define ieee754dp_fix(x)	ieee754dp_tint(x)
 #define ieee754sp_fix(x)	ieee754sp_tint(x)
+
+#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */
diff --git a/arch/mips/math-emu/kernel_linkage.c b/arch/mips/math-emu/kernel_linkage.c
index 4002f0cf79f..d187ab71c2f 100644
--- a/arch/mips/math-emu/kernel_linkage.c
+++ b/arch/mips/math-emu/kernel_linkage.c
@@ -27,8 +27,6 @@
 
 #include <asm/fpu_emulator.h>
 
-extern struct mips_fpu_emulator_private fpuemuprivate;
-
 #define SIGNALLING_NAN 0x7ff800007ff80000LL
 
 void fpu_emulator_init_fpu(void)
@@ -65,7 +63,6 @@ int fpu_emulator_save_context(struct sigcontext *sc)
 			       &sc->sc_fpregs[i]);
 	}
 	err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
-	err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
 
 	return err;
 }
@@ -81,7 +78,6 @@ int fpu_emulator_restore_context(struct sigcontext *sc)
 			       &sc->sc_fpregs[i]);
 	}
 	err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
-	err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
 
 	return err;
 }
@@ -102,7 +98,6 @@ int fpu_emulator_save_context32(struct sigcontext32 *sc)
 			       &sc->sc_fpregs[i]);
 	}
 	err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
-	err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
 
 	return err;
 }
@@ -118,7 +113,6 @@ int fpu_emulator_restore_context32(struct sigcontext32 *sc)
 			       &sc->sc_fpregs[i]);
 	}
 	err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
-	err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
 
 	return err;
 }