Linux-libre 4.5-gnu

14 files changed, 197 insertions, 93 deletions

diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 32f0e19a0..cdfd44ffa 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -1266,6 +1266,8 @@ branch_common:
 						 */
 						sig = mips_dsemul(xcp, ir,
 								  contpc);
+						if (sig < 0)
+							break;
 						if (sig)
 							xcp->cp0_epc = bcpc;
 						/*
@@ -1319,6 +1321,8 @@ branch_common:
 				 * instruction in the dslot
 				 */
 				sig = mips_dsemul(xcp, ir, contpc);
+				if (sig < 0)
+					break;
 				if (sig)
 					xcp->cp0_epc = bcpc;
 				/* SIGILL forces out of the emulation loop.  */
diff --git a/arch/mips/math-emu/dp_simple.c b/arch/mips/math-emu/dp_simple.c
index 926d56bf3..eb96485ed 100644
--- a/arch/mips/math-emu/dp_simple.c
+++ b/arch/mips/math-emu/dp_simple.c
@@ -23,27 +23,39 @@
 
 union ieee754dp ieee754dp_neg(union ieee754dp x)
 {
-	unsigned int oldrm;
 	union ieee754dp y;
 
-	oldrm = ieee754_csr.rm;
-	ieee754_csr.rm = FPU_CSR_RD;
-	y = ieee754dp_sub(ieee754dp_zero(0), x);
-	ieee754_csr.rm = oldrm;
+	if (ieee754_csr.abs2008) {
+		y = x;
+		DPSIGN(y) = !DPSIGN(x);
+	} else {
+		unsigned int oldrm;
+
+		oldrm = ieee754_csr.rm;
+		ieee754_csr.rm = FPU_CSR_RD;
+		y = ieee754dp_sub(ieee754dp_zero(0), x);
+		ieee754_csr.rm = oldrm;
+	}
 	return y;
 }
 
 union ieee754dp ieee754dp_abs(union ieee754dp x)
 {
-	unsigned int oldrm;
 	union ieee754dp y;
 
-	oldrm = ieee754_csr.rm;
-	ieee754_csr.rm = FPU_CSR_RD;
-	if (DPSIGN(x))
-		y = ieee754dp_sub(ieee754dp_zero(0), x);
-	else
-		y = ieee754dp_add(ieee754dp_zero(0), x);
-	ieee754_csr.rm = oldrm;
+	if (ieee754_csr.abs2008) {
+		y = x;
+		DPSIGN(y) = 0;
+	} else {
+		unsigned int oldrm;
+
+		oldrm = ieee754_csr.rm;
+		ieee754_csr.rm = FPU_CSR_RD;
+		if (DPSIGN(x))
+			y = ieee754dp_sub(ieee754dp_zero(0), x);
+		else
+			y = ieee754dp_add(ieee754dp_zero(0), x);
+		ieee754_csr.rm = oldrm;
+	}
 	return y;
 }
diff --git a/arch/mips/math-emu/dp_tint.c b/arch/mips/math-emu/dp_tint.c
index 6ffc336c5..f3985617c 100644
--- a/arch/mips/math-emu/dp_tint.c
+++ b/arch/mips/math-emu/dp_tint.c
@@ -38,10 +38,13 @@ int ieee754dp_tint(union ieee754dp x)
 	switch (xc) {
 	case IEEE754_CLASS_SNAN:
 	case IEEE754_CLASS_QNAN:
-	case IEEE754_CLASS_INF:
 		ieee754_setcx(IEEE754_INVALID_OPERATION);
 		return ieee754si_indef();
 
+	case IEEE754_CLASS_INF:
+		ieee754_setcx(IEEE754_INVALID_OPERATION);
+		return ieee754si_overflow(xs);
+
 	case IEEE754_CLASS_ZERO:
 		return 0;
 
@@ -53,7 +56,7 @@ int ieee754dp_tint(union ieee754dp x)
 		/* Set invalid. We will only use overflow for floating
 		   point overflow */
 		ieee754_setcx(IEEE754_INVALID_OPERATION);
-		return ieee754si_indef();
+		return ieee754si_overflow(xs);
 	}
 	/* oh gawd */
 	if (xe > DP_FBITS) {
@@ -93,7 +96,7 @@ int ieee754dp_tint(union ieee754dp x)
 		if ((xm >> 31) != 0 && (xs == 0 || xm != 0x80000000)) {
 			/* This can happen after rounding */
 			ieee754_setcx(IEEE754_INVALID_OPERATION);
-			return ieee754si_indef();
+			return ieee754si_overflow(xs);
 		}
 		if (round || sticky)
 			ieee754_setcx(IEEE754_INEXACT);
diff --git a/arch/mips/math-emu/dp_tlong.c b/arch/mips/math-emu/dp_tlong.c
index 9cdc145b7..748fa10ed 100644
--- a/arch/mips/math-emu/dp_tlong.c
+++ b/arch/mips/math-emu/dp_tlong.c
@@ -38,10 +38,13 @@ s64 ieee754dp_tlong(union ieee754dp x)
 	switch (xc) {
 	case IEEE754_CLASS_SNAN:
 	case IEEE754_CLASS_QNAN:
-	case IEEE754_CLASS_INF:
 		ieee754_setcx(IEEE754_INVALID_OPERATION);
 		return ieee754di_indef();
 
+	case IEEE754_CLASS_INF:
+		ieee754_setcx(IEEE754_INVALID_OPERATION);
+		return ieee754di_overflow(xs);
+
 	case IEEE754_CLASS_ZERO:
 		return 0;
 
@@ -56,7 +59,7 @@ s64 ieee754dp_tlong(union ieee754dp x)
 		/* Set invalid. We will only use overflow for floating
 		   point overflow */
 		ieee754_setcx(IEEE754_INVALID_OPERATION);
-		return ieee754di_indef();
+		return ieee754di_overflow(xs);
 	}
 	/* oh gawd */
 	if (xe > DP_FBITS) {
@@ -97,7 +100,7 @@ s64 ieee754dp_tlong(union ieee754dp x)
 		if ((xm >> 63) != 0) {
 			/* This can happen after rounding */
 			ieee754_setcx(IEEE754_INVALID_OPERATION);
-			return ieee754di_indef();
+			return ieee754di_overflow(xs);
 		}
 		if (round || sticky)
 			ieee754_setcx(IEEE754_INEXACT);
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
index cbb36c14b..46b964d2b 100644
--- a/arch/mips/math-emu/dsemul.c
+++ b/arch/mips/math-emu/dsemul.c
@@ -31,17 +31,41 @@ struct emuframe {
 	unsigned long		epc;
 };
 
+/*
+ * Set up an emulation frame for instruction IR, from a delay slot of
+ * a branch jumping to CPC.  Return 0 if successful, -1 if no emulation
+ * required, otherwise a signal number causing a frame setup failure.
+ */
 int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 {
+	int isa16 = get_isa16_mode(regs->cp0_epc);
+	mips_instruction break_math;
 	struct emuframe __user *fr;
 	int err;
 
-	if ((get_isa16_mode(regs->cp0_epc) && ((ir >> 16) == MM_NOP16)) ||
-		(ir == 0)) {
-		/* NOP is easy */
-		regs->cp0_epc = cpc;
-		clear_delay_slot(regs);
-		return 0;
+	/* NOP is easy */
+	if (ir == 0)
+		return -1;
+
+	/* microMIPS instructions */
+	if (isa16) {
+		union mips_instruction insn = { .word = ir };
+
+		/* NOP16 aka MOVE16 $0, $0 */
+		if ((ir >> 16) == MM_NOP16)
+			return -1;
+
+		/* ADDIUPC */
+		if (insn.mm_a_format.opcode == mm_addiupc_op) {
+			unsigned int rs;
+			s32 v;
+
+			rs = (((insn.mm_a_format.rs + 0x1e) & 0xf) + 2);
+			v = regs->cp0_epc & ~3;
+			v += insn.mm_a_format.simmediate << 2;
+			regs->regs[rs] = (long)v;
+			return -1;
+		}
 	}
 
 	pr_debug("dsemul %lx %lx\n", regs->cp0_epc, cpc);
@@ -55,14 +79,10 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 	 * Algorithmics used a system call instruction, and
 	 * borrowed that vector.  MIPS/Linux version is a bit
 	 * more heavyweight in the interests of portability and
-	 * multiprocessor support.  For Linux we generate a
-	 * an unaligned access and force an address error exception.
-	 *
-	 * For embedded systems (stand-alone) we prefer to use a
-	 * non-existing CP1 instruction. This prevents us from emulating
-	 * branches, but gives us a cleaner interface to the exception
-	 * handler (single entry point).
+	 * multiprocessor support.  For Linux we use a BREAK 514
+	 * instruction causing a breakpoint exception.
 	 */
+	break_math = BREAK_MATH(isa16);
 
 	/* Ensure that the two instructions are in the same cache line */
 	fr = (struct emuframe __user *)
@@ -72,14 +92,18 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 	if (unlikely(!access_ok(VERIFY_WRITE, fr, sizeof(struct emuframe))))
 		return SIGBUS;
 
-	if (get_isa16_mode(regs->cp0_epc)) {
-		err = __put_user(ir >> 16, (u16 __user *)(&fr->emul));
-		err |= __put_user(ir & 0xffff, (u16 __user *)((long)(&fr->emul) + 2));
-		err |= __put_user(BREAK_MATH >> 16, (u16 __user *)(&fr->badinst));
-		err |= __put_user(BREAK_MATH & 0xffff, (u16 __user *)((long)(&fr->badinst) + 2));
+	if (isa16) {
+		err = __put_user(ir >> 16,
+				 (u16 __user *)(&fr->emul));
+		err |= __put_user(ir & 0xffff,
+				  (u16 __user *)((long)(&fr->emul) + 2));
+		err |= __put_user(break_math >> 16,
+				  (u16 __user *)(&fr->badinst));
+		err |= __put_user(break_math & 0xffff,
+				  (u16 __user *)((long)(&fr->badinst) + 2));
 	} else {
 		err = __put_user(ir, &fr->emul);
-		err |= __put_user((mips_instruction)BREAK_MATH, &fr->badinst);
+		err |= __put_user(break_math, &fr->badinst);
 	}
 
 	err |= __put_user((mips_instruction)BD_COOKIE, &fr->cookie);
@@ -90,8 +114,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 		return SIGBUS;
 	}
 
-	regs->cp0_epc = ((unsigned long) &fr->emul) |
-		get_isa16_mode(regs->cp0_epc);
+	regs->cp0_epc = (unsigned long)&fr->emul | isa16;
 
 	flush_cache_sigtramp((unsigned long)&fr->emul);
 
@@ -100,6 +123,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 
 int do_dsemulret(struct pt_regs *xcp)
 {
+	int isa16 = get_isa16_mode(xcp->cp0_epc);
 	struct emuframe __user *fr;
 	unsigned long epc;
 	u32 insn, cookie;
@@ -122,16 +146,19 @@ int do_dsemulret(struct pt_regs *xcp)
 	 *  - Is the instruction pointed to by the EPC an BREAK_MATH?
 	 *  - Is the following memory word the BD_COOKIE?
 	 */
-	if (get_isa16_mode(xcp->cp0_epc)) {
-		err = __get_user(instr[0], (u16 __user *)(&fr->badinst));
-		err |= __get_user(instr[1], (u16 __user *)((long)(&fr->badinst) + 2));
+	if (isa16) {
+		err = __get_user(instr[0],
+				 (u16 __user *)(&fr->badinst));
+		err |= __get_user(instr[1],
+				  (u16 __user *)((long)(&fr->badinst) + 2));
 		insn = (instr[0] << 16) | instr[1];
 	} else {
 		err = __get_user(insn, &fr->badinst);
 	}
 	err |= __get_user(cookie, &fr->cookie);
 
-	if (unlikely(err || (insn != BREAK_MATH) || (cookie != BD_COOKIE))) {
+	if (unlikely(err ||
+		     insn != BREAK_MATH(isa16) || cookie != BD_COOKIE)) {
 		MIPS_FPU_EMU_INC_STATS(errors);
 		return 0;
 	}
diff --git a/arch/mips/math-emu/ieee754.c b/arch/mips/math-emu/ieee754.c
index 8e97acbbe..e16ae7b75 100644
--- a/arch/mips/math-emu/ieee754.c
+++ b/arch/mips/math-emu/ieee754.c
@@ -59,7 +59,8 @@ const union ieee754dp __ieee754dp_spcvals[] = {
 	DPCNST(1, 3,           0x4000000000000ULL),	/* - 10.0   */
 	DPCNST(0, DP_EMAX + 1, 0x0000000000000ULL),	/* + infinity */
 	DPCNST(1, DP_EMAX + 1, 0x0000000000000ULL),	/* - infinity */
-	DPCNST(0, DP_EMAX + 1, 0x7FFFFFFFFFFFFULL),	/* + indef quiet Nan */
+	DPCNST(0, DP_EMAX + 1, 0x7FFFFFFFFFFFFULL),	/* + ind legacy qNaN */
+	DPCNST(0, DP_EMAX + 1, 0x8000000000000ULL),	/* + indef 2008 qNaN */
 	DPCNST(0, DP_EMAX,     0xFFFFFFFFFFFFFULL),	/* + max */
 	DPCNST(1, DP_EMAX,     0xFFFFFFFFFFFFFULL),	/* - max */
 	DPCNST(0, DP_EMIN,     0x0000000000000ULL),	/* + min normal */
@@ -82,7 +83,8 @@ const union ieee754sp __ieee754sp_spcvals[] = {
 	SPCNST(1, 3,	       0x200000),	/* - 10.0   */
 	SPCNST(0, SP_EMAX + 1, 0x000000),	/* + infinity */
 	SPCNST(1, SP_EMAX + 1, 0x000000),	/* - infinity */
-	SPCNST(0, SP_EMAX + 1, 0x3FFFFF),	/* + indef quiet Nan  */
+	SPCNST(0, SP_EMAX + 1, 0x3FFFFF),	/* + indef legacy quiet NaN */
+	SPCNST(0, SP_EMAX + 1, 0x400000),	/* + indef 2008 quiet NaN */
 	SPCNST(0, SP_EMAX,     0x7FFFFF),	/* + max normal */
 	SPCNST(1, SP_EMAX,     0x7FFFFF),	/* - max normal */
 	SPCNST(0, SP_EMIN,     0x000000),	/* + min normal */
diff --git a/arch/mips/math-emu/ieee754.h b/arch/mips/math-emu/ieee754.h
index df9472071..d3be351ae 100644
--- a/arch/mips/math-emu/ieee754.h
+++ b/arch/mips/math-emu/ieee754.h
@@ -221,15 +221,16 @@ union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
 #define IEEE754_SPCVAL_NTEN		5	/* -10.0 */
 #define IEEE754_SPCVAL_PINFINITY	6	/* +inf */
 #define IEEE754_SPCVAL_NINFINITY	7	/* -inf */
-#define IEEE754_SPCVAL_INDEF		8	/* quiet NaN */
-#define IEEE754_SPCVAL_PMAX		9	/* +max norm */
-#define IEEE754_SPCVAL_NMAX		10	/* -max norm */
-#define IEEE754_SPCVAL_PMIN		11	/* +min norm */
-#define IEEE754_SPCVAL_NMIN		12	/* -min norm */
-#define IEEE754_SPCVAL_PMIND		13	/* +min denorm */
-#define IEEE754_SPCVAL_NMIND		14	/* -min denorm */
-#define IEEE754_SPCVAL_P1E31		15	/* + 1.0e31 */
-#define IEEE754_SPCVAL_P1E63		16	/* + 1.0e63 */
+#define IEEE754_SPCVAL_INDEF_LEG	8	/* legacy quiet NaN */
+#define IEEE754_SPCVAL_INDEF_2008	9	/* IEEE 754-2008 quiet NaN */
+#define IEEE754_SPCVAL_PMAX		10	/* +max norm */
+#define IEEE754_SPCVAL_NMAX		11	/* -max norm */
+#define IEEE754_SPCVAL_PMIN		12	/* +min norm */
+#define IEEE754_SPCVAL_NMIN		13	/* -min norm */
+#define IEEE754_SPCVAL_PMIND		14	/* +min denorm */
+#define IEEE754_SPCVAL_NMIND		15	/* -min denorm */
+#define IEEE754_SPCVAL_P1E31		16	/* + 1.0e31 */
+#define IEEE754_SPCVAL_P1E63		17	/* + 1.0e63 */
 
 extern const union ieee754dp __ieee754dp_spcvals[];
 extern const union ieee754sp __ieee754sp_spcvals[];
@@ -243,7 +244,8 @@ extern const union ieee754sp __ieee754sp_spcvals[];
 #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_indef()	(ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \
+						   ieee754_csr.nan2008])
 #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)])
@@ -254,7 +256,8 @@ extern const union ieee754sp __ieee754sp_spcvals[];
 #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_indef()	(ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \
+						   ieee754_csr.nan2008])
 #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)])
@@ -266,12 +269,25 @@ extern const union ieee754sp __ieee754sp_spcvals[];
  */
 static inline int ieee754si_indef(void)
 {
-	return INT_MAX;
+	return ieee754_csr.nan2008 ? 0 : INT_MAX;
 }
 
 static inline s64 ieee754di_indef(void)
 {
-	return S64_MAX;
+	return ieee754_csr.nan2008 ? 0 : S64_MAX;
+}
+
+/*
+ * Overflow integer value
+ */
+static inline int ieee754si_overflow(int xs)
+{
+	return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX;
+}
+
+static inline s64 ieee754di_overflow(int xs)
+{
+	return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX;
 }
 
 /* result types for xctx.rt */
diff --git a/arch/mips/math-emu/ieee754dp.c b/arch/mips/math-emu/ieee754dp.c
index 522d843f2..ad3c73436 100644
--- a/arch/mips/math-emu/ieee754dp.c
+++ b/arch/mips/math-emu/ieee754dp.c
@@ -37,8 +37,11 @@ static inline int ieee754dp_isnan(union ieee754dp x)
 
 static inline int ieee754dp_issnan(union ieee754dp x)
 {
+	int qbit;
+
 	assert(ieee754dp_isnan(x));
-	return (DPMANT(x) & DP_MBIT(DP_FBITS - 1)) == DP_MBIT(DP_FBITS - 1);
+	qbit = (DPMANT(x) & DP_MBIT(DP_FBITS - 1)) == DP_MBIT(DP_FBITS - 1);
+	return ieee754_csr.nan2008 ^ qbit;
 }
 
 
@@ -51,7 +54,12 @@ union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp r)
 	assert(ieee754dp_issnan(r));
 
 	ieee754_setcx(IEEE754_INVALID_OPERATION);
-	return ieee754dp_indef();
+	if (ieee754_csr.nan2008)
+		DPMANT(r) |= DP_MBIT(DP_FBITS - 1);
+	else
+		r = ieee754dp_indef();
+
+	return r;
 }
 
 static u64 ieee754dp_get_rounding(int sn, u64 xm)
diff --git a/arch/mips/math-emu/ieee754int.h b/arch/mips/math-emu/ieee754int.h
index 6383e2c5c..ed7bb277b 100644
--- a/arch/mips/math-emu/ieee754int.h
+++ b/arch/mips/math-emu/ieee754int.h
@@ -63,10 +63,10 @@ static inline int ieee754_class_nan(int xc)
 	if (ve == SP_EMAX+1+SP_EBIAS) {					\
 		if (vm == 0)						\
 			vc = IEEE754_CLASS_INF;				\
-		else if (vm & SP_MBIT(SP_FBITS-1))			\
-			vc = IEEE754_CLASS_SNAN;			\
-		else							\
+		else if (ieee754_csr.nan2008 ^ !(vm & SP_MBIT(SP_FBITS - 1))) \
 			vc = IEEE754_CLASS_QNAN;			\
+		else							\
+			vc = IEEE754_CLASS_SNAN;			\
 	} else if (ve == SP_EMIN-1+SP_EBIAS) {				\
 		if (vm) {						\
 			ve = SP_EMIN;					\
@@ -97,10 +97,10 @@ static inline int ieee754_class_nan(int xc)
 	if (ve == DP_EMAX+1+DP_EBIAS) {					\
 		if (vm == 0)						\
 			vc = IEEE754_CLASS_INF;				\
-		else if (vm & DP_MBIT(DP_FBITS-1))			\
-			vc = IEEE754_CLASS_SNAN;			\
-		else							\
+		else if (ieee754_csr.nan2008 ^ !(vm & DP_MBIT(DP_FBITS - 1))) \
 			vc = IEEE754_CLASS_QNAN;			\
+		else							\
+			vc = IEEE754_CLASS_SNAN;			\
 	} else if (ve == DP_EMIN-1+DP_EBIAS) {				\
 		if (vm) {						\
 			ve = DP_EMIN;					\
diff --git a/arch/mips/math-emu/ieee754sp.c b/arch/mips/math-emu/ieee754sp.c
index ca8e35e33..def00ffc5 100644
--- a/arch/mips/math-emu/ieee754sp.c
+++ b/arch/mips/math-emu/ieee754sp.c
@@ -37,8 +37,11 @@ static inline int ieee754sp_isnan(union ieee754sp x)
 
 static inline int ieee754sp_issnan(union ieee754sp x)
 {
+	int qbit;
+
 	assert(ieee754sp_isnan(x));
-	return SPMANT(x) & SP_MBIT(SP_FBITS - 1);
+	qbit = (SPMANT(x) & SP_MBIT(SP_FBITS - 1)) == SP_MBIT(SP_FBITS - 1);
+	return ieee754_csr.nan2008 ^ qbit;
 }
 
 
@@ -51,7 +54,12 @@ union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp r)
 	assert(ieee754sp_issnan(r));
 
 	ieee754_setcx(IEEE754_INVALID_OPERATION);
-	return ieee754sp_indef();
+	if (ieee754_csr.nan2008)
+		SPMANT(r) |= SP_MBIT(SP_FBITS - 1);
+	else
+		r = ieee754sp_indef();
+
+	return r;
 }
 
 static unsigned ieee754sp_get_rounding(int sn, unsigned xm)
diff --git a/arch/mips/math-emu/sp_fdp.c b/arch/mips/math-emu/sp_fdp.c
index 379714889..5060e8fdc 100644
--- a/arch/mips/math-emu/sp_fdp.c
+++ b/arch/mips/math-emu/sp_fdp.c
@@ -44,13 +44,16 @@ union ieee754sp ieee754sp_fdp(union ieee754dp x)
 
 	switch (xc) {
 	case IEEE754_CLASS_SNAN:
-		return ieee754sp_nanxcpt(ieee754sp_nan_fdp(xs, xm));
-
+		x = ieee754dp_nanxcpt(x);
+		EXPLODEXDP;
+		/* Fall through.  */
 	case IEEE754_CLASS_QNAN:
 		y = ieee754sp_nan_fdp(xs, xm);
-		EXPLODEYSP;
-		if (!ieee754_class_nan(yc))
-			y = ieee754sp_indef();
+		if (!ieee754_csr.nan2008) {
+			EXPLODEYSP;
+			if (!ieee754_class_nan(yc))
+				y = ieee754sp_indef();
+		}
 		return y;
 
 	case IEEE754_CLASS_INF:
diff --git a/arch/mips/math-emu/sp_simple.c b/arch/mips/math-emu/sp_simple.c
index c50e9451f..756c9cf2d 100644
--- a/arch/mips/math-emu/sp_simple.c
+++ b/arch/mips/math-emu/sp_simple.c
@@ -23,27 +23,39 @@
 
 union ieee754sp ieee754sp_neg(union ieee754sp x)
 {
-	unsigned int oldrm;
 	union ieee754sp y;
 
-	oldrm = ieee754_csr.rm;
-	ieee754_csr.rm = FPU_CSR_RD;
-	y = ieee754sp_sub(ieee754sp_zero(0), x);
-	ieee754_csr.rm = oldrm;
+	if (ieee754_csr.abs2008) {
+		y = x;
+		SPSIGN(y) = !SPSIGN(x);
+	} else {
+		unsigned int oldrm;
+
+		oldrm = ieee754_csr.rm;
+		ieee754_csr.rm = FPU_CSR_RD;
+		y = ieee754sp_sub(ieee754sp_zero(0), x);
+		ieee754_csr.rm = oldrm;
+	}
 	return y;
 }
 
 union ieee754sp ieee754sp_abs(union ieee754sp x)
 {
-	unsigned int oldrm;
 	union ieee754sp y;
 
-	oldrm = ieee754_csr.rm;
-	ieee754_csr.rm = FPU_CSR_RD;
-	if (SPSIGN(x))
-		y = ieee754sp_sub(ieee754sp_zero(0), x);
-	else
-		y = ieee754sp_add(ieee754sp_zero(0), x);
-	ieee754_csr.rm = oldrm;
+	if (ieee754_csr.abs2008) {
+		y = x;
+		SPSIGN(y) = 0;
+	} else {
+		unsigned int oldrm;
+
+		oldrm = ieee754_csr.rm;
+		ieee754_csr.rm = FPU_CSR_RD;
+		if (SPSIGN(x))
+			y = ieee754sp_sub(ieee754sp_zero(0), x);
+		else
+			y = ieee754sp_add(ieee754sp_zero(0), x);
+		ieee754_csr.rm = oldrm;
+	}
 	return y;
 }
diff --git a/arch/mips/math-emu/sp_tint.c b/arch/mips/math-emu/sp_tint.c
index 091299a31..f4b4cabfe 100644
--- a/arch/mips/math-emu/sp_tint.c
+++ b/arch/mips/math-emu/sp_tint.c
@@ -38,10 +38,13 @@ int ieee754sp_tint(union ieee754sp x)
 	switch (xc) {
 	case IEEE754_CLASS_SNAN:
 	case IEEE754_CLASS_QNAN:
-	case IEEE754_CLASS_INF:
 		ieee754_setcx(IEEE754_INVALID_OPERATION);
 		return ieee754si_indef();
 
+	case IEEE754_CLASS_INF:
+		ieee754_setcx(IEEE754_INVALID_OPERATION);
+		return ieee754si_overflow(xs);
+
 	case IEEE754_CLASS_ZERO:
 		return 0;
 
@@ -56,7 +59,7 @@ int ieee754sp_tint(union ieee754sp x)
 		/* Set invalid. We will only use overflow for floating
 		   point overflow */
 		ieee754_setcx(IEEE754_INVALID_OPERATION);
-		return ieee754si_indef();
+		return ieee754si_overflow(xs);
 	}
 	/* oh gawd */
 	if (xe > SP_FBITS) {
@@ -97,7 +100,7 @@ int ieee754sp_tint(union ieee754sp x)
 		if ((xm >> 31) != 0) {
 			/* This can happen after rounding */
 			ieee754_setcx(IEEE754_INVALID_OPERATION);
-			return ieee754si_indef();
+			return ieee754si_overflow(xs);
 		}
 		if (round || sticky)
 			ieee754_setcx(IEEE754_INEXACT);
diff --git a/arch/mips/math-emu/sp_tlong.c b/arch/mips/math-emu/sp_tlong.c
index 9f3c742c1..a2450c7e4 100644
--- a/arch/mips/math-emu/sp_tlong.c
+++ b/arch/mips/math-emu/sp_tlong.c
@@ -39,10 +39,13 @@ s64 ieee754sp_tlong(union ieee754sp x)
 	switch (xc) {
 	case IEEE754_CLASS_SNAN:
 	case IEEE754_CLASS_QNAN:
-	case IEEE754_CLASS_INF:
 		ieee754_setcx(IEEE754_INVALID_OPERATION);
 		return ieee754di_indef();
 
+	case IEEE754_CLASS_INF:
+		ieee754_setcx(IEEE754_INVALID_OPERATION);
+		return ieee754di_overflow(xs);
+
 	case IEEE754_CLASS_ZERO:
 		return 0;
 
@@ -57,7 +60,7 @@ s64 ieee754sp_tlong(union ieee754sp x)
 		/* Set invalid. We will only use overflow for floating
 		   point overflow */
 		ieee754_setcx(IEEE754_INVALID_OPERATION);
-		return ieee754di_indef();
+		return ieee754di_overflow(xs);
 	}
 	/* oh gawd */
 	if (xe > SP_FBITS) {
@@ -94,7 +97,7 @@ s64 ieee754sp_tlong(union ieee754sp x)
 		if ((xm >> 63) != 0) {
 			/* This can happen after rounding */
 			ieee754_setcx(IEEE754_INVALID_OPERATION);
-			return ieee754di_indef();
+			return ieee754di_overflow(xs);
 		}
 		if (round || sticky)
 			ieee754_setcx(IEEE754_INEXACT);