Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 673 insertions, 0 deletions

diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
new file mode 100644
index 000000000..e8a4d77cf
--- /dev/null
+++ b/arch/parisc/kernel/unaligned.c
@@ -0,0 +1,673 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *    Unaligned memory access handler
+ *
+ *    Copyright (C) 2001 Randolph Chung <tausq@debian.org>
+ *    Copyright (C) 2022 Helge Deller <deller@gmx.de>
+ *    Significantly tweaked by LaMont Jones <lamont@debian.org>
+ */
+
+#include <linux/sched/signal.h>
+#include <linux/signal.h>
+#include <linux/ratelimit.h>
+#include <linux/uaccess.h>
+#include <asm/hardirq.h>
+#include <asm/traps.h>
+
+/* #define DEBUG_UNALIGNED 1 */
+
+#ifdef DEBUG_UNALIGNED
+#define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __func__ ); printk(KERN_DEBUG fmt, ##args ); } while (0)
+#else
+#define DPRINTF(fmt, args...)
+#endif
+
+#define RFMT "%#08lx"
+
+/* 1111 1100 0000 0000 0001 0011 1100 0000 */
+#define OPCODE1(a,b,c)	((a)<<26|(b)<<12|(c)<<6) 
+#define OPCODE2(a,b)	((a)<<26|(b)<<1)
+#define OPCODE3(a,b)	((a)<<26|(b)<<2)
+#define OPCODE4(a)	((a)<<26)
+#define OPCODE1_MASK	OPCODE1(0x3f,1,0xf)
+#define OPCODE2_MASK 	OPCODE2(0x3f,1)
+#define OPCODE3_MASK	OPCODE3(0x3f,1)
+#define OPCODE4_MASK    OPCODE4(0x3f)
+
+/* skip LDB - never unaligned (index) */
+#define OPCODE_LDH_I	OPCODE1(0x03,0,0x1)
+#define OPCODE_LDW_I	OPCODE1(0x03,0,0x2)
+#define OPCODE_LDD_I	OPCODE1(0x03,0,0x3)
+#define OPCODE_LDDA_I	OPCODE1(0x03,0,0x4)
+#define OPCODE_LDCD_I	OPCODE1(0x03,0,0x5)
+#define OPCODE_LDWA_I	OPCODE1(0x03,0,0x6)
+#define OPCODE_LDCW_I	OPCODE1(0x03,0,0x7)
+/* skip LDB - never unaligned (short) */
+#define OPCODE_LDH_S	OPCODE1(0x03,1,0x1)
+#define OPCODE_LDW_S	OPCODE1(0x03,1,0x2)
+#define OPCODE_LDD_S	OPCODE1(0x03,1,0x3)
+#define OPCODE_LDDA_S	OPCODE1(0x03,1,0x4)
+#define OPCODE_LDCD_S	OPCODE1(0x03,1,0x5)
+#define OPCODE_LDWA_S	OPCODE1(0x03,1,0x6)
+#define OPCODE_LDCW_S	OPCODE1(0x03,1,0x7)
+/* skip STB - never unaligned */
+#define OPCODE_STH	OPCODE1(0x03,1,0x9)
+#define OPCODE_STW	OPCODE1(0x03,1,0xa)
+#define OPCODE_STD	OPCODE1(0x03,1,0xb)
+/* skip STBY - never unaligned */
+/* skip STDBY - never unaligned */
+#define OPCODE_STWA	OPCODE1(0x03,1,0xe)
+#define OPCODE_STDA	OPCODE1(0x03,1,0xf)
+
+#define OPCODE_FLDWX	OPCODE1(0x09,0,0x0)
+#define OPCODE_FLDWXR	OPCODE1(0x09,0,0x1)
+#define OPCODE_FSTWX	OPCODE1(0x09,0,0x8)
+#define OPCODE_FSTWXR	OPCODE1(0x09,0,0x9)
+#define OPCODE_FLDWS	OPCODE1(0x09,1,0x0)
+#define OPCODE_FLDWSR	OPCODE1(0x09,1,0x1)
+#define OPCODE_FSTWS	OPCODE1(0x09,1,0x8)
+#define OPCODE_FSTWSR	OPCODE1(0x09,1,0x9)
+#define OPCODE_FLDDX	OPCODE1(0x0b,0,0x0)
+#define OPCODE_FSTDX	OPCODE1(0x0b,0,0x8)
+#define OPCODE_FLDDS	OPCODE1(0x0b,1,0x0)
+#define OPCODE_FSTDS	OPCODE1(0x0b,1,0x8)
+
+#define OPCODE_LDD_L	OPCODE2(0x14,0)
+#define OPCODE_FLDD_L	OPCODE2(0x14,1)
+#define OPCODE_STD_L	OPCODE2(0x1c,0)
+#define OPCODE_FSTD_L	OPCODE2(0x1c,1)
+
+#define OPCODE_LDW_M	OPCODE3(0x17,1)
+#define OPCODE_FLDW_L	OPCODE3(0x17,0)
+#define OPCODE_FSTW_L	OPCODE3(0x1f,0)
+#define OPCODE_STW_M	OPCODE3(0x1f,1)
+
+#define OPCODE_LDH_L    OPCODE4(0x11)
+#define OPCODE_LDW_L    OPCODE4(0x12)
+#define OPCODE_LDWM     OPCODE4(0x13)
+#define OPCODE_STH_L    OPCODE4(0x19)
+#define OPCODE_STW_L    OPCODE4(0x1A)
+#define OPCODE_STWM     OPCODE4(0x1B)
+
+#define MAJOR_OP(i) (((i)>>26)&0x3f)
+#define R1(i) (((i)>>21)&0x1f)
+#define R2(i) (((i)>>16)&0x1f)
+#define R3(i) ((i)&0x1f)
+#define FR3(i) ((((i)&0x1f)<<1)|(((i)>>6)&1))
+#define IM(i,n) (((i)>>1&((1<<(n-1))-1))|((i)&1?((0-1L)<<(n-1)):0))
+#define IM5_2(i) IM((i)>>16,5)
+#define IM5_3(i) IM((i),5)
+#define IM14(i) IM((i),14)
+
+#define ERR_NOTHANDLED	-1
+
+int unaligned_enabled __read_mostly = 1;
+
+static int emulate_ldh(struct pt_regs *regs, int toreg)
+{
+	unsigned long saddr = regs->ior;
+	unsigned long val = 0, temp1;
+	ASM_EXCEPTIONTABLE_VAR(ret);
+
+	DPRINTF("load " RFMT ":" RFMT " to r%d for 2 bytes\n", 
+		regs->isr, regs->ior, toreg);
+
+	__asm__ __volatile__  (
+"	mtsp	%4, %%sr1\n"
+"1:	ldbs	0(%%sr1,%3), %2\n"
+"2:	ldbs	1(%%sr1,%3), %0\n"
+"	depw	%2, 23, 24, %0\n"
+"3:	\n"
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
+	: "+r" (val), "+r" (ret), "=&r" (temp1)
+	: "r" (saddr), "r" (regs->isr) );
+
+	DPRINTF("val = " RFMT "\n", val);
+
+	if (toreg)
+		regs->gr[toreg] = val;
+
+	return ret;
+}
+
+static int emulate_ldw(struct pt_regs *regs, int toreg, int flop)
+{
+	unsigned long saddr = regs->ior;
+	unsigned long val = 0, temp1, temp2;
+	ASM_EXCEPTIONTABLE_VAR(ret);
+
+	DPRINTF("load " RFMT ":" RFMT " to r%d for 4 bytes\n", 
+		regs->isr, regs->ior, toreg);
+
+	__asm__ __volatile__  (
+"	zdep	%4,28,2,%2\n"		/* r19=(ofs&3)*8 */
+"	mtsp	%5, %%sr1\n"
+"	depw	%%r0,31,2,%4\n"
+"1:	ldw	0(%%sr1,%4),%0\n"
+"2:	ldw	4(%%sr1,%4),%3\n"
+"	subi	32,%2,%2\n"
+"	mtctl	%2,11\n"
+"	vshd	%0,%3,%0\n"
+"3:	\n"
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
+	: "+r" (val), "+r" (ret), "=&r" (temp1), "=&r" (temp2)
+	: "r" (saddr), "r" (regs->isr) );
+
+	DPRINTF("val = " RFMT "\n", val);
+
+	if (flop)
+		((__u32*)(regs->fr))[toreg] = val;
+	else if (toreg)
+		regs->gr[toreg] = val;
+
+	return ret;
+}
+static int emulate_ldd(struct pt_regs *regs, int toreg, int flop)
+{
+	unsigned long saddr = regs->ior;
+	__u64 val = 0;
+	ASM_EXCEPTIONTABLE_VAR(ret);
+
+	DPRINTF("load " RFMT ":" RFMT " to r%d for 8 bytes\n", 
+		regs->isr, regs->ior, toreg);
+
+	if (!IS_ENABLED(CONFIG_64BIT) && !flop)
+		return ERR_NOTHANDLED;
+
+#ifdef CONFIG_64BIT
+	__asm__ __volatile__  (
+"	depd,z	%3,60,3,%%r19\n"		/* r19=(ofs&7)*8 */
+"	mtsp	%4, %%sr1\n"
+"	depd	%%r0,63,3,%3\n"
+"1:	ldd	0(%%sr1,%3),%0\n"
+"2:	ldd	8(%%sr1,%3),%%r20\n"
+"	subi	64,%%r19,%%r19\n"
+"	mtsar	%%r19\n"
+"	shrpd	%0,%%r20,%%sar,%0\n"
+"3:	\n"
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
+	: "=r" (val), "+r" (ret)
+	: "0" (val), "r" (saddr), "r" (regs->isr)
+	: "r19", "r20" );
+#else
+    {
+	unsigned long shift, temp1;
+	__asm__ __volatile__  (
+"	zdep	%2,29,2,%3\n"		/* r19=(ofs&3)*8 */
+"	mtsp	%5, %%sr1\n"
+"	dep	%%r0,31,2,%2\n"
+"1:	ldw	0(%%sr1,%2),%0\n"
+"2:	ldw	4(%%sr1,%2),%R0\n"
+"3:	ldw	8(%%sr1,%2),%4\n"
+"	subi	32,%3,%3\n"
+"	mtsar	%3\n"
+"	vshd	%0,%R0,%0\n"
+"	vshd	%R0,%4,%R0\n"
+"4:	\n"
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 4b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 4b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 4b)
+	: "+r" (val), "+r" (ret), "+r" (saddr), "=&r" (shift), "=&r" (temp1)
+	: "r" (regs->isr) );
+    }
+#endif
+
+	DPRINTF("val = 0x%llx\n", val);
+
+	if (flop)
+		regs->fr[toreg] = val;
+	else if (toreg)
+		regs->gr[toreg] = val;
+
+	return ret;
+}
+
+static int emulate_sth(struct pt_regs *regs, int frreg)
+{
+	unsigned long val = regs->gr[frreg], temp1;
+	ASM_EXCEPTIONTABLE_VAR(ret);
+
+	if (!frreg)
+		val = 0;
+
+	DPRINTF("store r%d (" RFMT ") to " RFMT ":" RFMT " for 2 bytes\n", frreg,
+		val, regs->isr, regs->ior);
+
+	__asm__ __volatile__ (
+"	mtsp %4, %%sr1\n"
+"	extrw,u %2, 23, 8, %1\n"
+"1:	stb %1, 0(%%sr1, %3)\n"
+"2:	stb %2, 1(%%sr1, %3)\n"
+"3:	\n"
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
+	: "+r" (ret), "=&r" (temp1)
+	: "r" (val), "r" (regs->ior), "r" (regs->isr) );
+
+	return ret;
+}
+
+static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
+{
+	unsigned long val;
+	ASM_EXCEPTIONTABLE_VAR(ret);
+
+	if (flop)
+		val = ((__u32*)(regs->fr))[frreg];
+	else if (frreg)
+		val = regs->gr[frreg];
+	else
+		val = 0;
+
+	DPRINTF("store r%d (" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg,
+		val, regs->isr, regs->ior);
+
+
+	__asm__ __volatile__ (
+"	mtsp %3, %%sr1\n"
+"	zdep	%2, 28, 2, %%r19\n"
+"	dep	%%r0, 31, 2, %2\n"
+"	mtsar	%%r19\n"
+"	depwi,z	-2, %%sar, 32, %%r19\n"
+"1:	ldw	0(%%sr1,%2),%%r20\n"
+"2:	ldw	4(%%sr1,%2),%%r21\n"
+"	vshd	%%r0, %1, %%r22\n"
+"	vshd	%1, %%r0, %%r1\n"
+"	and	%%r20, %%r19, %%r20\n"
+"	andcm	%%r21, %%r19, %%r21\n"
+"	or	%%r22, %%r20, %%r20\n"
+"	or	%%r1, %%r21, %%r21\n"
+"	stw	%%r20,0(%%sr1,%2)\n"
+"	stw	%%r21,4(%%sr1,%2)\n"
+"3:	\n"
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b)
+	: "+r" (ret)
+	: "r" (val), "r" (regs->ior), "r" (regs->isr)
+	: "r19", "r20", "r21", "r22", "r1" );
+
+	return ret;
+}
+static int emulate_std(struct pt_regs *regs, int frreg, int flop)
+{
+	__u64 val;
+	ASM_EXCEPTIONTABLE_VAR(ret);
+
+	if (flop)
+		val = regs->fr[frreg];
+	else if (frreg)
+		val = regs->gr[frreg];
+	else
+		val = 0;
+
+	DPRINTF("store r%d (0x%016llx) to " RFMT ":" RFMT " for 8 bytes\n", frreg, 
+		val,  regs->isr, regs->ior);
+
+	if (!IS_ENABLED(CONFIG_64BIT) && !flop)
+		return ERR_NOTHANDLED;
+
+#ifdef CONFIG_64BIT
+	__asm__ __volatile__ (
+"	mtsp %3, %%sr1\n"
+"	depd,z	%2, 60, 3, %%r19\n"
+"	depd	%%r0, 63, 3, %2\n"
+"	mtsar	%%r19\n"
+"	depdi,z	-2, %%sar, 64, %%r19\n"
+"1:	ldd	0(%%sr1,%2),%%r20\n"
+"2:	ldd	8(%%sr1,%2),%%r21\n"
+"	shrpd	%%r0, %1, %%sar, %%r22\n"
+"	shrpd	%1, %%r0, %%sar, %%r1\n"
+"	and	%%r20, %%r19, %%r20\n"
+"	andcm	%%r21, %%r19, %%r21\n"
+"	or	%%r22, %%r20, %%r20\n"
+"	or	%%r1, %%r21, %%r21\n"
+"3:	std	%%r20,0(%%sr1,%2)\n"
+"4:	std	%%r21,8(%%sr1,%2)\n"
+"5:	\n"
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 5b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 5b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 5b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(4b, 5b)
+	: "+r" (ret)
+	: "r" (val), "r" (regs->ior), "r" (regs->isr)
+	: "r19", "r20", "r21", "r22", "r1" );
+#else
+    {
+	unsigned long valh=(val>>32),vall=(val&0xffffffffl);
+	__asm__ __volatile__ (
+"	mtsp	%4, %%sr1\n"
+"	zdep	%2, 29, 2, %%r19\n"
+"	dep	%%r0, 31, 2, %3\n"
+"	mtsar	%%r19\n"
+"	zvdepi	-2, 32, %%r19\n"
+"1:	ldw	0(%%sr1,%3),%%r20\n"
+"2:	ldw	8(%%sr1,%3),%%r21\n"
+"	vshd	%1, %2, %%r1\n"
+"	vshd	%%r0, %1, %1\n"
+"	vshd	%2, %%r0, %2\n"
+"	and	%%r20, %%r19, %%r20\n"
+"	andcm	%%r21, %%r19, %%r21\n"
+"	or	%1, %%r20, %1\n"
+"	or	%2, %%r21, %2\n"
+"3:	stw	%1,0(%%sr1,%3)\n"
+"4:	stw	%%r1,4(%%sr1,%3)\n"
+"5:	stw	%2,8(%%sr1,%3)\n"
+"6:	\n"
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 6b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 6b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 6b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(4b, 6b)
+	ASM_EXCEPTIONTABLE_ENTRY_EFAULT(5b, 6b)
+	: "+r" (ret)
+	: "r" (valh), "r" (vall), "r" (regs->ior), "r" (regs->isr)
+	: "r19", "r20", "r21", "r1" );
+    }
+#endif
+
+	return ret;
+}
+
+void handle_unaligned(struct pt_regs *regs)
+{
+	static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
+	unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
+	int modify = 0;
+	int ret = ERR_NOTHANDLED;
+
+	__inc_irq_stat(irq_unaligned_count);
+
+	/* log a message with pacing */
+	if (user_mode(regs)) {
+		if (current->thread.flags & PARISC_UAC_SIGBUS) {
+			goto force_sigbus;
+		}
+
+		if (!(current->thread.flags & PARISC_UAC_NOPRINT) &&
+			__ratelimit(&ratelimit)) {
+			printk(KERN_WARNING "%s(%d): unaligned access to " RFMT
+				" at ip " RFMT " (iir " RFMT ")\n",
+				current->comm, task_pid_nr(current), regs->ior,
+				regs->iaoq[0], regs->iir);
+#ifdef DEBUG_UNALIGNED
+			show_regs(regs);
+#endif		
+		}
+
+		if (!unaligned_enabled)
+			goto force_sigbus;
+	}
+
+	/* handle modification - OK, it's ugly, see the instruction manual */
+	switch (MAJOR_OP(regs->iir))
+	{
+	case 0x03:
+	case 0x09:
+	case 0x0b:
+		if (regs->iir&0x20)
+		{
+			modify = 1;
+			if (regs->iir&0x1000)		/* short loads */
+				if (regs->iir&0x200)
+					newbase += IM5_3(regs->iir);
+				else
+					newbase += IM5_2(regs->iir);
+			else if (regs->iir&0x2000)	/* scaled indexed */
+			{
+				int shift=0;
+				switch (regs->iir & OPCODE1_MASK)
+				{
+				case OPCODE_LDH_I:
+					shift= 1; break;
+				case OPCODE_LDW_I:
+					shift= 2; break;
+				case OPCODE_LDD_I:
+				case OPCODE_LDDA_I:
+					shift= 3; break;
+				}
+				newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0)<<shift;
+			} else				/* simple indexed */
+				newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0);
+		}
+		break;
+	case 0x13:
+	case 0x1b:
+		modify = 1;
+		newbase += IM14(regs->iir);
+		break;
+	case 0x14:
+	case 0x1c:
+		if (regs->iir&8)
+		{
+			modify = 1;
+			newbase += IM14(regs->iir&~0xe);
+		}
+		break;
+	case 0x16:
+	case 0x1e:
+		modify = 1;
+		newbase += IM14(regs->iir&6);
+		break;
+	case 0x17:
+	case 0x1f:
+		if (regs->iir&4)
+		{
+			modify = 1;
+			newbase += IM14(regs->iir&~4);
+		}
+		break;
+	}
+
+	/* TODO: make this cleaner... */
+	switch (regs->iir & OPCODE1_MASK)
+	{
+	case OPCODE_LDH_I:
+	case OPCODE_LDH_S:
+		ret = emulate_ldh(regs, R3(regs->iir));
+		break;
+
+	case OPCODE_LDW_I:
+	case OPCODE_LDWA_I:
+	case OPCODE_LDW_S:
+	case OPCODE_LDWA_S:
+		ret = emulate_ldw(regs, R3(regs->iir),0);
+		break;
+
+	case OPCODE_STH:
+		ret = emulate_sth(regs, R2(regs->iir));
+		break;
+
+	case OPCODE_STW:
+	case OPCODE_STWA:
+		ret = emulate_stw(regs, R2(regs->iir),0);
+		break;
+
+#ifdef CONFIG_64BIT
+	case OPCODE_LDD_I:
+	case OPCODE_LDDA_I:
+	case OPCODE_LDD_S:
+	case OPCODE_LDDA_S:
+		ret = emulate_ldd(regs, R3(regs->iir),0);
+		break;
+
+	case OPCODE_STD:
+	case OPCODE_STDA:
+		ret = emulate_std(regs, R2(regs->iir),0);
+		break;
+#endif
+
+	case OPCODE_FLDWX:
+	case OPCODE_FLDWS:
+	case OPCODE_FLDWXR:
+	case OPCODE_FLDWSR:
+		ret = emulate_ldw(regs,FR3(regs->iir),1);
+		break;
+
+	case OPCODE_FLDDX:
+	case OPCODE_FLDDS:
+		ret = emulate_ldd(regs,R3(regs->iir),1);
+		break;
+
+	case OPCODE_FSTWX:
+	case OPCODE_FSTWS:
+	case OPCODE_FSTWXR:
+	case OPCODE_FSTWSR:
+		ret = emulate_stw(regs,FR3(regs->iir),1);
+		break;
+
+	case OPCODE_FSTDX:
+	case OPCODE_FSTDS:
+		ret = emulate_std(regs,R3(regs->iir),1);
+		break;
+
+	case OPCODE_LDCD_I:
+	case OPCODE_LDCW_I:
+	case OPCODE_LDCD_S:
+	case OPCODE_LDCW_S:
+		ret = ERR_NOTHANDLED;	/* "undefined", but lets kill them. */
+		break;
+	}
+	switch (regs->iir & OPCODE2_MASK)
+	{
+	case OPCODE_FLDD_L:
+		ret = emulate_ldd(regs,R2(regs->iir),1);
+		break;
+	case OPCODE_FSTD_L:
+		ret = emulate_std(regs, R2(regs->iir),1);
+		break;
+#ifdef CONFIG_64BIT
+	case OPCODE_LDD_L:
+		ret = emulate_ldd(regs, R2(regs->iir),0);
+		break;
+	case OPCODE_STD_L:
+		ret = emulate_std(regs, R2(regs->iir),0);
+		break;
+#endif
+	}
+	switch (regs->iir & OPCODE3_MASK)
+	{
+	case OPCODE_FLDW_L:
+		ret = emulate_ldw(regs, R2(regs->iir), 1);
+		break;
+	case OPCODE_LDW_M:
+		ret = emulate_ldw(regs, R2(regs->iir), 0);
+		break;
+
+	case OPCODE_FSTW_L:
+		ret = emulate_stw(regs, R2(regs->iir),1);
+		break;
+	case OPCODE_STW_M:
+		ret = emulate_stw(regs, R2(regs->iir),0);
+		break;
+	}
+	switch (regs->iir & OPCODE4_MASK)
+	{
+	case OPCODE_LDH_L:
+		ret = emulate_ldh(regs, R2(regs->iir));
+		break;
+	case OPCODE_LDW_L:
+	case OPCODE_LDWM:
+		ret = emulate_ldw(regs, R2(regs->iir),0);
+		break;
+	case OPCODE_STH_L:
+		ret = emulate_sth(regs, R2(regs->iir));
+		break;
+	case OPCODE_STW_L:
+	case OPCODE_STWM:
+		ret = emulate_stw(regs, R2(regs->iir),0);
+		break;
+	}
+
+	if (ret == 0 && modify && R1(regs->iir))
+		regs->gr[R1(regs->iir)] = newbase;
+
+
+	if (ret == ERR_NOTHANDLED)
+		printk(KERN_CRIT "Not-handled unaligned insn 0x%08lx\n", regs->iir);
+
+	DPRINTF("ret = %d\n", ret);
+
+	if (ret)
+	{
+		/*
+		 * The unaligned handler failed.
+		 * If we were called by __get_user() or __put_user() jump
+		 * to it's exception fixup handler instead of crashing.
+		 */
+		if (!user_mode(regs) && fixup_exception(regs))
+			return;
+
+		printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret);
+		die_if_kernel("Unaligned data reference", regs, 28);
+
+		if (ret == -EFAULT)
+		{
+			force_sig_fault(SIGSEGV, SEGV_MAPERR,
+					(void __user *)regs->ior);
+		}
+		else
+		{
+force_sigbus:
+			/* couldn't handle it ... */
+			force_sig_fault(SIGBUS, BUS_ADRALN,
+					(void __user *)regs->ior);
+		}
+		
+		return;
+	}
+
+	/* else we handled it, let life go on. */
+	regs->gr[0]|=PSW_N;
+}
+
+/*
+ * NB: check_unaligned() is only used for PCXS processors right
+ * now, so we only check for PA1.1 encodings at this point.
+ */
+
+int
+check_unaligned(struct pt_regs *regs)
+{
+	unsigned long align_mask;
+
+	/* Get alignment mask */
+
+	align_mask = 0UL;
+	switch (regs->iir & OPCODE1_MASK) {
+
+	case OPCODE_LDH_I:
+	case OPCODE_LDH_S:
+	case OPCODE_STH:
+		align_mask = 1UL;
+		break;
+
+	case OPCODE_LDW_I:
+	case OPCODE_LDWA_I:
+	case OPCODE_LDW_S:
+	case OPCODE_LDWA_S:
+	case OPCODE_STW:
+	case OPCODE_STWA:
+		align_mask = 3UL;
+		break;
+
+	default:
+		switch (regs->iir & OPCODE4_MASK) {
+		case OPCODE_LDH_L:
+		case OPCODE_STH_L:
+			align_mask = 1UL;
+			break;
+		case OPCODE_LDW_L:
+		case OPCODE_LDWM:
+		case OPCODE_STW_L:
+		case OPCODE_STWM:
+			align_mask = 3UL;
+			break;
+		}
+		break;
+	}
+
+	return (int)(regs->ior & align_mask);
+}
+