powerpc: Handle most loads and stores in instruction emulation code

This extends the instruction emulation infrastructure in sstep.c to
handle all the load and store instructions defined in the Power ISA
v3.0, except for the atomic memory operations, ldmx (which was never
implemented), lfdp/stfdp, and the vector element load/stores.

The instructions added are:

Integer loads and stores: lbarx, lharx, lqarx, stbcx., sthcx., stqcx.,
lq, stq.

VSX loads and stores: lxsiwzx, lxsiwax, stxsiwx, lxvx, lxvl, lxvll,
lxvdsx, lxvwsx, stxvx, stxvl, stxvll, lxsspx, lxsdx, stxsspx, stxsdx,
lxvw4x, lxsibzx, lxvh8x, lxsihzx, lxvb16x, stxvw4x, stxsibx, stxvh8x,
stxsihx, stxvb16x, lxsd, lxssp, lxv, stxsd, stxssp, stxv.

These instructions are handled both in the analyse_instr phase and in
the emulate_step phase.

The code for lxvd2ux and stxvd2ux has been taken out, as those
instructions were never implemented in any processor and have been
taken out of the architecture, and their opcodes have been reused for
other instructions in POWER9 (lxvb16x and stxvb16x).

The emulation for the VSX loads and stores uses helper functions
which don't access registers or memory directly, which can hopefully
be reused by KVM later.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 570 insertions, 40 deletions

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index b80ccff23657..b1ba74117ad5 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -42,8 +42,29 @@ extern int do_stfs(int rn, unsigned long ea);
 extern int do_stfd(int rn, unsigned long ea);
 extern int do_lvx(int rn, unsigned long ea);
 extern int do_stvx(int rn, unsigned long ea);
-extern int do_lxvd2x(int rn, unsigned long ea);
-extern int do_stxvd2x(int rn, unsigned long ea);
+extern void load_vsrn(int vsr, const void *p);
+extern void store_vsrn(int vsr, void *p);
+extern void conv_sp_to_dp(const float *sp, double *dp);
+extern void conv_dp_to_sp(const double *dp, float *sp);
+#endif
+
+#ifdef __powerpc64__
+/*
+ * Functions in quad.S
+ */
+extern int do_lq(unsigned long ea, unsigned long *regs);
+extern int do_stq(unsigned long ea, unsigned long val0, unsigned long val1);
+extern int do_lqarx(unsigned long ea, unsigned long *regs);
+extern int do_stqcx(unsigned long ea, unsigned long val0, unsigned long val1,
+		    unsigned int *crp);
+#endif
+
+#ifdef __LITTLE_ENDIAN__
+#define IS_LE	1
+#define IS_BE	0
+#else
+#define IS_LE	0
+#define IS_BE	1
 #endif
 
 /*
@@ -125,6 +146,23 @@ static nokprobe_inline unsigned long dsform_ea(unsigned int instr,
 
 	return truncate_if_32bit(regs->msr, ea);
 }
+
+/*
+ * Calculate effective address for a DQ-form instruction
+ */
+static nokprobe_inline unsigned long dqform_ea(unsigned int instr,
+					       const struct pt_regs *regs)
+{
+	int ra;
+	unsigned long ea;
+
+	ra = (instr >> 16) & 0x1f;
+	ea = (signed short) (instr & ~0xf);	/* sign-extend */
+	if (ra)
+		ea += regs->gpr[ra];
+
+	return truncate_if_32bit(regs->msr, ea);
+}
 #endif /* __powerpc64 */
 
 /*
@@ -454,43 +492,195 @@ static nokprobe_inline int do_vec_store(int rn, int (*func)(int, unsigned long),
 }
 #endif /* CONFIG_ALTIVEC */
 
-#ifdef CONFIG_VSX
-static nokprobe_inline int do_vsx_load(int rn, int (*func)(int, unsigned long),
-				 unsigned long ea, struct pt_regs *regs)
+#ifdef __powerpc64__
+static nokprobe_inline int emulate_lq(struct pt_regs *regs, unsigned long ea,
+				      int reg)
 {
 	int err;
-	unsigned long val[2];
 
 	if (!address_ok(regs, ea, 16))
 		return -EFAULT;
-	if ((ea & 3) == 0)
-		return (*func)(rn, ea);
-	err = read_mem_unaligned(&val[0], ea, 8, regs);
-	if (!err)
-		err = read_mem_unaligned(&val[1], ea + 8, 8, regs);
+	/* if aligned, should be atomic */
+	if ((ea & 0xf) == 0)
+		return do_lq(ea, &regs->gpr[reg]);
+
+	err = read_mem(&regs->gpr[reg + IS_LE], ea, 8, regs);
 	if (!err)
-		err = (*func)(rn, (unsigned long) &val[0]);
+		err = read_mem(&regs->gpr[reg + IS_BE], ea + 8, 8, regs);
 	return err;
 }
 
-static nokprobe_inline int do_vsx_store(int rn, int (*func)(int, unsigned long),
-				 unsigned long ea, struct pt_regs *regs)
+static nokprobe_inline int emulate_stq(struct pt_regs *regs, unsigned long ea,
+				       int reg)
 {
 	int err;
-	unsigned long val[2];
 
 	if (!address_ok(regs, ea, 16))
 		return -EFAULT;
-	if ((ea & 3) == 0)
-		return (*func)(rn, ea);
-	err = (*func)(rn, (unsigned long) &val[0]);
-	if (err)
-		return err;
-	err = write_mem_unaligned(val[0], ea, 8, regs);
+	/* if aligned, should be atomic */
+	if ((ea & 0xf) == 0)
+		return do_stq(ea, regs->gpr[reg], regs->gpr[reg + 1]);
+
+	err = write_mem(regs->gpr[reg + IS_LE], ea, 8, regs);
 	if (!err)
-		err = write_mem_unaligned(val[1], ea + 8, 8, regs);
+		err = write_mem(regs->gpr[reg + IS_BE], ea + 8, 8, regs);
 	return err;
 }
+#endif /* __powerpc64 */
+
+#ifdef CONFIG_VSX
+void emulate_vsx_load(struct instruction_op *op, union vsx_reg *reg,
+		      const void *mem)
+{
+	int size, read_size;
+	int i, j;
+	const unsigned int *wp;
+	const unsigned short *hp;
+	const unsigned char *bp;
+
+	size = GETSIZE(op->type);
+	reg->d[0] = reg->d[1] = 0;
+
+	switch (op->element_size) {
+	case 16:
+		/* whole vector; lxv[x] or lxvl[l] */
+		if (size == 0)
+			break;
+		memcpy(reg, mem, size);
+		if (IS_LE && (op->vsx_flags & VSX_LDLEFT)) {
+			/* reverse 16 bytes */
+			unsigned long tmp;
+			tmp = byterev_8(reg->d[0]);
+			reg->d[0] = byterev_8(reg->d[1]);
+			reg->d[1] = tmp;
+		}
+		break;
+	case 8:
+		/* scalar loads, lxvd2x, lxvdsx */
+		read_size = (size >= 8) ? 8 : size;
+		i = IS_LE ? 8 : 8 - read_size;
+		memcpy(&reg->b[i], mem, read_size);
+		if (size < 8) {
+			if (op->type & SIGNEXT) {
+				/* size == 4 is the only case here */
+				reg->d[IS_LE] = (signed int) reg->d[IS_LE];
+			} else if (op->vsx_flags & VSX_FPCONV) {
+				preempt_disable();
+				conv_sp_to_dp(&reg->fp[1 + IS_LE],
+					      &reg->dp[IS_LE]);
+				preempt_enable();
+			}
+		} else {
+			if (size == 16)
+				reg->d[IS_BE] = *(unsigned long *)(mem + 8);
+			else if (op->vsx_flags & VSX_SPLAT)
+				reg->d[IS_BE] = reg->d[IS_LE];
+		}
+		break;
+	case 4:
+		/* lxvw4x, lxvwsx */
+		wp = mem;
+		for (j = 0; j < size / 4; ++j) {
+			i = IS_LE ? 3 - j : j;
+			reg->w[i] = *wp++;
+		}
+		if (op->vsx_flags & VSX_SPLAT) {
+			u32 val = reg->w[IS_LE ? 3 : 0];
+			for (; j < 4; ++j) {
+				i = IS_LE ? 3 - j : j;
+				reg->w[i] = val;
+			}
+		}
+		break;
+	case 2:
+		/* lxvh8x */
+		hp = mem;
+		for (j = 0; j < size / 2; ++j) {
+			i = IS_LE ? 7 - j : j;
+			reg->h[i] = *hp++;
+		}
+		break;
+	case 1:
+		/* lxvb16x */
+		bp = mem;
+		for (j = 0; j < size; ++j) {
+			i = IS_LE ? 15 - j : j;
+			reg->b[i] = *bp++;
+		}
+		break;
+	}
+}
+EXPORT_SYMBOL_GPL(emulate_vsx_load);
+NOKPROBE_SYMBOL(emulate_vsx_load);
+
+void emulate_vsx_store(struct instruction_op *op, const union vsx_reg *reg,
+		       void *mem)
+{
+	int size, write_size;
+	int i, j;
+	union vsx_reg buf;
+	unsigned int *wp;
+	unsigned short *hp;
+	unsigned char *bp;
+
+	size = GETSIZE(op->type);
+
+	switch (op->element_size) {
+	case 16:
+		/* stxv, stxvx, stxvl, stxvll */
+		if (size == 0)
+			break;
+		if (IS_LE && (op->vsx_flags & VSX_LDLEFT)) {
+			/* reverse 16 bytes */
+			buf.d[0] = byterev_8(reg->d[1]);
+			buf.d[1] = byterev_8(reg->d[0]);
+			reg = &buf;
+		}
+		memcpy(mem, reg, size);
+		break;
+	case 8:
+		/* scalar stores, stxvd2x */
+		write_size = (size >= 8) ? 8 : size;
+		i = IS_LE ? 8 : 8 - write_size;
+		if (size < 8 && op->vsx_flags & VSX_FPCONV) {
+			buf.d[0] = buf.d[1] = 0;
+			preempt_disable();
+			conv_dp_to_sp(&reg->dp[IS_LE], &buf.fp[1 + IS_LE]);
+			preempt_enable();
+			reg = &buf;
+		}
+		memcpy(mem, &reg->b[i], write_size);
+		if (size == 16)
+			memcpy(mem + 8, &reg->d[IS_BE], 8);
+		break;
+	case 4:
+		/* stxvw4x */
+		wp = mem;
+		for (j = 0; j < size / 4; ++j) {
+			i = IS_LE ? 3 - j : j;
+			*wp++ = reg->w[i];
+		}
+		break;
+	case 2:
+		/* stxvh8x */
+		hp = mem;
+		for (j = 0; j < size / 2; ++j) {
+			i = IS_LE ? 7 - j : j;
+			*hp++ = reg->h[i];
+		}
+		break;
+	case 1:
+		/* stvxb16x */
+		bp = mem;
+		for (j = 0; j < size; ++j) {
+			i = IS_LE ? 15 - j : j;
+			*bp++ = reg->b[i];
+		}
+		break;
+	}
+}
+EXPORT_SYMBOL_GPL(emulate_vsx_store);
+NOKPROBE_SYMBOL(emulate_vsx_store);
 #endif /* CONFIG_VSX */
 
 #define __put_user_asmx(x, addr, err, op, cr)		\
@@ -1455,14 +1645,15 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 		break;
 	}
 
-	/*
-	 * Loads and stores.
-	 */
+/*
+ * Loads and stores.
+ */
 	op->type = UNKNOWN;
 	op->update_reg = ra;
 	op->reg = rd;
 	op->val = regs->gpr[rd];
 	u = (instr >> 20) & UPDATE;
+	op->vsx_flags = 0;
 
 	switch (opcode) {
 	case 31:
@@ -1486,9 +1677,30 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 			op->type = MKOP(STCX, 0, 8);
 			break;
 
-		case 21:	/* ldx */
-		case 53:	/* ldux */
-			op->type = MKOP(LOAD, u, 8);
+		case 52:	/* lbarx */
+			op->type = MKOP(LARX, 0, 1);
+			break;
+
+		case 694:	/* stbcx. */
+			op->type = MKOP(STCX, 0, 1);
+			break;
+
+		case 116:	/* lharx */
+			op->type = MKOP(LARX, 0, 2);
+			break;
+
+		case 726:	/* sthcx. */
+			op->type = MKOP(STCX, 0, 2);
+			break;
+
+		case 276:	/* lqarx */
+			if (!((rd & 1) || rd == ra || rd == rb))
+				op->type = MKOP(LARX, 0, 16);
+			break;
+
+		case 182:	/* stqcx. */
+			if (!(rd & 1))
+				op->type = MKOP(STCX, 0, 16);
 			break;
 #endif
 
@@ -1506,6 +1718,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 		case 103:	/* lvx */
 		case 359:	/* lvxl */
 			op->type = MKOP(LOAD_VMX, 0, 16);
+			op->element_size = 16;
 			break;
 
 		case 231:	/* stvx */
@@ -1515,6 +1728,11 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 #endif /* CONFIG_ALTIVEC */
 
 #ifdef __powerpc64__
+		case 21:	/* ldx */
+		case 53:	/* ldux */
+			op->type = MKOP(LOAD, u, 8);
+			break;
+
 		case 149:	/* stdx */
 		case 181:	/* stdux */
 			op->type = MKOP(STORE, u, 8);
@@ -1635,16 +1853,184 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 			break;
 
 #ifdef CONFIG_VSX
+		case 12:	/* lxsiwzx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 4);
+			op->element_size = 8;
+			break;
+
+		case 76:	/* lxsiwax */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, SIGNEXT, 4);
+			op->element_size = 8;
+			break;
+
+		case 140:	/* stxsiwx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 4);
+			op->element_size = 8;
+			break;
+
+		case 268:	/* lxvx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 16);
+			op->element_size = 16;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 269:	/* lxvl */
+		case 301: {	/* lxvll */
+			int nb;
+			op->reg = rd | ((instr & 1) << 5);
+			op->ea = ra ? regs->gpr[ra] : 0;
+			nb = regs->gpr[rb] & 0xff;
+			if (nb > 16)
+				nb = 16;
+			op->type = MKOP(LOAD_VSX, 0, nb);
+			op->element_size = 16;
+			op->vsx_flags = ((instr & 0x20) ? VSX_LDLEFT : 0) |
+				VSX_CHECK_VEC;
+			break;
+		}
+		case 332:	/* lxvdsx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 8);
+			op->element_size = 8;
+			op->vsx_flags = VSX_SPLAT;
+			break;
+
+		case 364:	/* lxvwsx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 4);
+			op->element_size = 4;
+			op->vsx_flags = VSX_SPLAT | VSX_CHECK_VEC;
+			break;
+
+		case 396:	/* stxvx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 16);
+			op->element_size = 16;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 397:	/* stxvl */
+		case 429: {	/* stxvll */
+			int nb;
+			op->reg = rd | ((instr & 1) << 5);
+			op->ea = ra ? regs->gpr[ra] : 0;
+			nb = regs->gpr[rb] & 0xff;
+			if (nb > 16)
+				nb = 16;
+			op->type = MKOP(STORE_VSX, 0, nb);
+			op->element_size = 16;
+			op->vsx_flags = ((instr & 0x20) ? VSX_LDLEFT : 0) |
+				VSX_CHECK_VEC;
+			break;
+		}
+		case 524:	/* lxsspx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 4);
+			op->element_size = 8;
+			op->vsx_flags = VSX_FPCONV;
+			break;
+
+		case 588:	/* lxsdx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 8);
+			op->element_size = 8;
+			break;
+
+		case 652:	/* stxsspx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 4);
+			op->element_size = 8;
+			op->vsx_flags = VSX_FPCONV;
+			break;
+
+		case 716:	/* stxsdx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 8);
+			op->element_size = 8;
+			break;
+
+		case 780:	/* lxvw4x */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 16);
+			op->element_size = 4;
+			break;
+
+		case 781:	/* lxsibzx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 1);
+			op->element_size = 8;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 812:	/* lxvh8x */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 16);
+			op->element_size = 2;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 813:	/* lxsihzx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 2);
+			op->element_size = 8;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
 		case 844:	/* lxvd2x */
-		case 876:	/* lxvd2ux */
 			op->reg = rd | ((instr & 1) << 5);
-			op->type = MKOP(LOAD_VSX, u, 16);
+			op->type = MKOP(LOAD_VSX, 0, 16);
+			op->element_size = 8;
+			break;
+
+		case 876:	/* lxvb16x */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(LOAD_VSX, 0, 16);
+			op->element_size = 1;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 908:	/* stxvw4x */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 16);
+			op->element_size = 4;
+			break;
+
+		case 909:	/* stxsibx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 1);
+			op->element_size = 8;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 940:	/* stxvh8x */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 16);
+			op->element_size = 2;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 941:	/* stxsihx */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 2);
+			op->element_size = 8;
+			op->vsx_flags = VSX_CHECK_VEC;
 			break;
 
 		case 972:	/* stxvd2x */
-		case 1004:	/* stxvd2ux */
 			op->reg = rd | ((instr & 1) << 5);
-			op->type = MKOP(STORE_VSX, u, 16);
+			op->type = MKOP(STORE_VSX, 0, 16);
+			op->element_size = 8;
+			break;
+
+		case 1004:	/* stxvb16x */
+			op->reg = rd | ((instr & 1) << 5);
+			op->type = MKOP(STORE_VSX, 0, 16);
+			op->element_size = 1;
+			op->vsx_flags = VSX_CHECK_VEC;
 			break;
 
 #endif /* CONFIG_VSX */
@@ -1732,6 +2118,34 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 #endif
 
 #ifdef __powerpc64__
+	case 56:	/* lq */
+		if (!((rd & 1) || (rd == ra)))
+			op->type = MKOP(LOAD, 0, 16);
+		op->ea = dqform_ea(instr, regs);
+		break;
+#endif
+
+#ifdef CONFIG_VSX
+	case 57:	/* lxsd, lxssp */
+		op->ea = dsform_ea(instr, regs);
+		switch (instr & 3) {
+		case 2:		/* lxsd */
+			op->reg = rd + 32;
+			op->type = MKOP(LOAD_VSX, 0, 8);
+			op->element_size = 8;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+		case 3:		/* lxssp */
+			op->reg = rd + 32;
+			op->type = MKOP(LOAD_VSX, 0, 4);
+			op->element_size = 8;
+			op->vsx_flags = VSX_FPCONV | VSX_CHECK_VEC;
+			break;
+		}
+		break;
+#endif /* CONFIG_VSX */
+
+#ifdef __powerpc64__
 	case 58:	/* ld[u], lwa */
 		op->ea = dsform_ea(instr, regs);
 		switch (instr & 3) {
@@ -1746,7 +2160,51 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 			break;
 		}
 		break;
+#endif
 
+#ifdef CONFIG_VSX
+	case 61:	/* lxv, stxsd, stxssp, stxv */
+		switch (instr & 7) {
+		case 1:		/* lxv */
+			op->ea = dqform_ea(instr, regs);
+			if (instr & 8)
+				op->reg = rd + 32;
+			op->type = MKOP(LOAD_VSX, 0, 16);
+			op->element_size = 16;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 2:		/* stxsd with LSB of DS field = 0 */
+		case 6:		/* stxsd with LSB of DS field = 1 */
+			op->ea = dsform_ea(instr, regs);
+			op->reg = rd + 32;
+			op->type = MKOP(STORE_VSX, 0, 8);
+			op->element_size = 8;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+
+		case 3:		/* stxssp with LSB of DS field = 0 */
+		case 7:		/* stxssp with LSB of DS field = 1 */
+			op->ea = dsform_ea(instr, regs);
+			op->reg = rd + 32;
+			op->type = MKOP(STORE_VSX, 0, 4);
+			op->element_size = 8;
+			op->vsx_flags = VSX_FPCONV | VSX_CHECK_VEC;
+			break;
+
+		case 5:		/* stxv */
+			op->ea = dqform_ea(instr, regs);
+			if (instr & 8)
+				op->reg = rd + 32;
+			op->type = MKOP(STORE_VSX, 0, 16);
+			op->element_size = 16;
+			op->vsx_flags = VSX_CHECK_VEC;
+			break;
+		}
+		break;
+#endif /* CONFIG_VSX */
+
+#ifdef __powerpc64__
 	case 62:	/* std[u] */
 		op->ea = dsform_ea(instr, regs);
 		switch (instr & 3) {
@@ -1756,6 +2214,10 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 		case 1:		/* stdu */
 			op->type = MKOP(STORE, UPDATE, 8);
 			break;
+		case 2:		/* stq */
+			if (!(rd & 1))
+				op->type = MKOP(STORE, 0, 16);
+			break;
 		}
 		break;
 #endif /* __powerpc64__ */
@@ -1994,6 +2456,14 @@ int emulate_step(struct pt_regs *regs, unsigned int instr)
 			return 0;
 		err = 0;
 		switch (size) {
+#ifdef __powerpc64__
+		case 1:
+			__get_user_asmx(val, op.ea, err, "lbarx");
+			break;
+		case 2:
+			__get_user_asmx(val, op.ea, err, "lharx");
+			break;
+#endif
 		case 4:
 			__get_user_asmx(val, op.ea, err, "lwarx");
 			break;
@@ -2001,6 +2471,9 @@ int emulate_step(struct pt_regs *regs, unsigned int instr)
 		case 8:
 			__get_user_asmx(val, op.ea, err, "ldarx");
 			break;
+		case 16:
+			err = do_lqarx(op.ea, &regs->gpr[op.reg]);
+			goto ldst_done;
 #endif
 		default:
 			return 0;
@@ -2016,6 +2489,14 @@ int emulate_step(struct pt_regs *regs, unsigned int instr)
 			return 0;
 		err = 0;
 		switch (size) {
+#ifdef __powerpc64__
+		case 1:
+			__put_user_asmx(op.val, op.ea, err, "stbcx.", cr);
+			break;
+		case 2:
+			__put_user_asmx(op.val, op.ea, err, "stbcx.", cr);
+			break;
+#endif
 		case 4:
 			__put_user_asmx(op.val, op.ea, err, "stwcx.", cr);
 			break;
@@ -2023,6 +2504,10 @@ int emulate_step(struct pt_regs *regs, unsigned int instr)
 		case 8:
 			__put_user_asmx(op.val, op.ea, err, "stdcx.", cr);
 			break;
+		case 16:
+			err = do_stqcx(op.ea, regs->gpr[op.reg],
+				       regs->gpr[op.reg + 1], &cr);
+			break;
 #endif
 		default:
 			return 0;
@@ -2034,6 +2519,12 @@ int emulate_step(struct pt_regs *regs, unsigned int instr)
 		goto ldst_done;
 
 	case LOAD:
+#ifdef __powerpc64__
+		if (size == 16) {
+			err = emulate_lq(regs, op.ea, op.reg);
+			goto ldst_done;
+		}
+#endif
 		err = read_mem(&regs->gpr[op.reg], op.ea, size, regs);
 		if (!err) {
 			if (op.type & SIGNEXT)
@@ -2057,15 +2548,31 @@ int emulate_step(struct pt_regs *regs, unsigned int instr)
 	case LOAD_VMX:
 		if (!(regs->msr & MSR_VEC))
 			return 0;
-		err = do_vec_load(op.reg, do_lvx, op.ea & ~0xfUL, regs);
+		err = do_vec_load(op.reg, do_lvx, op.ea, regs);
 		goto ldst_done;
 #endif
 #ifdef CONFIG_VSX
-	case LOAD_VSX:
-		if (!(regs->msr & MSR_VSX))
+	case LOAD_VSX: {
+		char mem[16];
+		union vsx_reg buf;
+		unsigned long msrbit = MSR_VSX;
+
+		/*
+		 * Some VSX instructions check the MSR_VEC bit rather than MSR_VSX
+		 * when the target of the instruction is a vector register.
+		 */
+		if (op.reg >= 32 && (op.vsx_flags & VSX_CHECK_VEC))
+			msrbit = MSR_VEC;
+		if (!(regs->msr & msrbit))
+			return 0;
+		if (!address_ok(regs, op.ea, size) ||
+		    __copy_from_user(mem, (void __user *)op.ea, size))
 			return 0;
-		err = do_vsx_load(op.reg, do_lxvd2x, op.ea, regs);
+
+		emulate_vsx_load(&op, &buf, mem);
+		load_vsrn(op.reg, &buf);
 		goto ldst_done;
+	}
 #endif
 	case LOAD_MULTI:
 		if (regs->msr & MSR_LE)
@@ -2086,6 +2593,12 @@ int emulate_step(struct pt_regs *regs, unsigned int instr)
 		goto instr_done;
 
 	case STORE:
+#ifdef __powerpc64__
+		if (size == 16) {
+			err = emulate_stq(regs, op.ea, op.reg);
+			goto ldst_done;
+		}
+#endif
 		if ((op.type & UPDATE) && size == sizeof(long) &&
 		    op.reg == 1 && op.update_reg == 1 &&
 		    !(regs->msr & MSR_PR) &&
@@ -2110,15 +2623,32 @@ int emulate_step(struct pt_regs *regs, unsigned int instr)
 	case STORE_VMX:
 		if (!(regs->msr & MSR_VEC))
 			return 0;
-		err = do_vec_store(op.reg, do_stvx, op.ea & ~0xfUL, regs);
+		err = do_vec_store(op.reg, do_stvx, op.ea, regs);
 		goto ldst_done;
 #endif
 #ifdef CONFIG_VSX
-	case STORE_VSX:
-		if (!(regs->msr & MSR_VSX))
+	case STORE_VSX: {
+		char mem[16];
+		union vsx_reg buf;
+		unsigned long msrbit = MSR_VSX;
+
+		/*
+		 * Some VSX instructions check the MSR_VEC bit rather than MSR_VSX
+		 * when the target of the instruction is a vector register.
+		 */
+		if (op.reg >= 32 && (op.vsx_flags & VSX_CHECK_VEC))
+			msrbit = MSR_VEC;
+		if (!(regs->msr & msrbit))
+			return 0;
+		if (!address_ok(regs, op.ea, size))
+			return 0;
+
+		store_vsrn(op.reg, &buf);
+		emulate_vsx_store(&op, &buf, mem);
+		if (__copy_to_user((void __user *)op.ea, mem, size))
 			return 0;
-		err = do_vsx_store(op.reg, do_stxvd2x, op.ea, regs);
 		goto ldst_done;
+	}
 #endif
 	case STORE_MULTI:
 		if (regs->msr & MSR_LE)