summaryrefslogtreecommitdiffstats
path: root/arch/parisc/kernel/unaligned.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/parisc/kernel/unaligned.c')
-rw-r--r--arch/parisc/kernel/unaligned.c673
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);
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-08 16:32:40 +0000