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Diffstat (limited to 'arch/mn10300/mm/misalignment.c')
-rw-r--r--arch/mn10300/mm/misalignment.c661
1 files changed, 661 insertions, 0 deletions
diff --git a/arch/mn10300/mm/misalignment.c b/arch/mn10300/mm/misalignment.c
new file mode 100644
index 000000000000..32aa89dc3848
--- /dev/null
+++ b/arch/mn10300/mm/misalignment.c
@@ -0,0 +1,661 @@
+/* MN10300 Misalignment fixup handler
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+#include <asm/smp.h>
+#include <asm/pgalloc.h>
+#include <asm/cpu-regs.h>
+#include <asm/busctl-regs.h>
+#include <asm/fpu.h>
+#include <asm/gdb-stub.h>
+#include <asm/asm-offsets.h>
+
+#if 0
+#define kdebug(FMT, ...) printk(KERN_DEBUG FMT, ##__VA_ARGS__)
+#else
+#define kdebug(FMT, ...) do {} while (0)
+#endif
+
+static int misalignment_addr(unsigned long *registers, unsigned params,
+ unsigned opcode, unsigned disp,
+ void **_address, unsigned long **_postinc);
+
+static int misalignment_reg(unsigned long *registers, unsigned params,
+ unsigned opcode, unsigned disp,
+ unsigned long **_register);
+
+static inline unsigned int_log2(unsigned x)
+{
+ unsigned y;
+ asm("bsch %1,%0" : "=r"(y) : "r"(x), "0"(0));
+ return y;
+}
+#define log2(x) int_log2(x)
+
+static const unsigned Dreg_index[] = {
+ REG_D0 >> 2, REG_D1 >> 2, REG_D2 >> 2, REG_D3 >> 2
+};
+
+static const unsigned Areg_index[] = {
+ REG_A0 >> 2, REG_A1 >> 2, REG_A2 >> 2, REG_A3 >> 2
+};
+
+static const unsigned Rreg_index[] = {
+ REG_E0 >> 2, REG_E1 >> 2, REG_E2 >> 2, REG_E3 >> 2,
+ REG_E4 >> 2, REG_E5 >> 2, REG_E6 >> 2, REG_E7 >> 2,
+ REG_A0 >> 2, REG_A1 >> 2, REG_A2 >> 2, REG_A3 >> 2,
+ REG_D0 >> 2, REG_D1 >> 2, REG_D2 >> 2, REG_D3 >> 2
+};
+
+enum format_id {
+ FMT_S0,
+ FMT_S1,
+ FMT_S2,
+ FMT_S4,
+ FMT_D0,
+ FMT_D1,
+ FMT_D2,
+ FMT_D4,
+ FMT_D6,
+ FMT_D7,
+ FMT_D8,
+ FMT_D9,
+};
+
+struct {
+ u_int8_t opsz, dispsz;
+} format_tbl[16] = {
+ [FMT_S0] = { 8, 0 },
+ [FMT_S1] = { 8, 8 },
+ [FMT_S2] = { 8, 16 },
+ [FMT_S4] = { 8, 32 },
+ [FMT_D0] = { 16, 0 },
+ [FMT_D1] = { 16, 8 },
+ [FMT_D2] = { 16, 16 },
+ [FMT_D4] = { 16, 32 },
+ [FMT_D6] = { 24, 0 },
+ [FMT_D7] = { 24, 8 },
+ [FMT_D8] = { 24, 24 },
+ [FMT_D9] = { 24, 32 },
+};
+
+enum value_id {
+ DM0, /* data reg in opcode in bits 0-1 */
+ DM1, /* data reg in opcode in bits 2-3 */
+ DM2, /* data reg in opcode in bits 4-5 */
+ AM0, /* addr reg in opcode in bits 0-1 */
+ AM1, /* addr reg in opcode in bits 2-3 */
+ AM2, /* addr reg in opcode in bits 4-5 */
+ RM0, /* reg in opcode in bits 0-3 */
+ RM1, /* reg in opcode in bits 2-5 */
+ RM2, /* reg in opcode in bits 4-7 */
+ RM4, /* reg in opcode in bits 8-11 */
+ RM6, /* reg in opcode in bits 12-15 */
+
+ RD0, /* reg in displacement in bits 0-3 */
+ RD2, /* reg in displacement in bits 4-7 */
+
+ SP, /* stack pointer */
+
+ SD8, /* 8-bit signed displacement */
+ SD16, /* 16-bit signed displacement */
+ SD24, /* 24-bit signed displacement */
+ SIMM4_2, /* 4-bit signed displacement in opcode bits 4-7 */
+ SIMM8, /* 8-bit signed immediate */
+ IMM24, /* 24-bit unsigned immediate */
+ IMM32, /* 32-bit unsigned immediate */
+ IMM32_HIGH8, /* 32-bit unsigned immediate, high 8-bits in opcode */
+
+ DN0 = DM0,
+ DN1 = DM1,
+ DN2 = DM2,
+ AN0 = AM0,
+ AN1 = AM1,
+ AN2 = AM2,
+ RN0 = RM0,
+ RN1 = RM1,
+ RN2 = RM2,
+ RN4 = RM4,
+ RN6 = RM6,
+ DI = DM1,
+ RI = RM2,
+
+};
+
+struct mn10300_opcode {
+ const char *name;
+ u_int32_t opcode;
+ u_int32_t opmask;
+ unsigned exclusion;
+
+ enum format_id format;
+
+ unsigned cpu_mask;
+#define AM33 330
+
+ unsigned params[2];
+#define MEM(ADDR) (0x80000000 | (ADDR))
+#define MEM2(ADDR1, ADDR2) (0x80000000 | (ADDR1) << 8 | (ADDR2))
+#define MEMINC(ADDR) (0x81000000 | (ADDR))
+#define MEMINC2(ADDR, INC) (0x81000000 | (ADDR) << 8 | (INC))
+};
+
+/* LIBOPCODES EXCERPT
+ Assemble Matsushita MN10300 instructions.
+ Copyright 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public Licence as published by
+ the Free Software Foundation; either version 2 of the Licence, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public Licence for more details.
+
+ You should have received a copy of the GNU General Public Licence
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+static const struct mn10300_opcode mn10300_opcodes[] = {
+{ "mov", 0x60, 0xf0, 0, FMT_S0, 0, {DM1, MEM(AN0)}},
+{ "mov", 0x70, 0xf0, 0, FMT_S0, 0, {MEM(AM0), DN1}},
+{ "mov", 0xf000, 0xfff0, 0, FMT_D0, 0, {MEM(AM0), AN1}},
+{ "mov", 0xf010, 0xfff0, 0, FMT_D0, 0, {AM1, MEM(AN0)}},
+{ "mov", 0xf300, 0xffc0, 0, FMT_D0, 0, {MEM2(DI, AM0), DN2}},
+{ "mov", 0xf340, 0xffc0, 0, FMT_D0, 0, {DM2, MEM2(DI, AN0)}},
+{ "mov", 0xf380, 0xffc0, 0, FMT_D0, 0, {MEM2(DI, AM0), AN2}},
+{ "mov", 0xf3c0, 0xffc0, 0, FMT_D0, 0, {AM2, MEM2(DI, AN0)}},
+{ "mov", 0xf80000, 0xfff000, 0, FMT_D1, 0, {MEM2(SD8, AM0), DN1}},
+{ "mov", 0xf81000, 0xfff000, 0, FMT_D1, 0, {DM1, MEM2(SD8, AN0)}},
+{ "mov", 0xf82000, 0xfff000, 0, FMT_D1, 0, {MEM2(SD8,AM0), AN1}},
+{ "mov", 0xf83000, 0xfff000, 0, FMT_D1, 0, {AM1, MEM2(SD8, AN0)}},
+{ "mov", 0xf8f000, 0xfffc00, 0, FMT_D1, AM33, {MEM2(SD8, AM0), SP}},
+{ "mov", 0xf8f400, 0xfffc00, 0, FMT_D1, AM33, {SP, MEM2(SD8, AN0)}},
+{ "mov", 0xf90a00, 0xffff00, 0, FMT_D6, AM33, {MEM(RM0), RN2}},
+{ "mov", 0xf91a00, 0xffff00, 0, FMT_D6, AM33, {RM2, MEM(RN0)}},
+{ "mov", 0xf96a00, 0xffff00, 0x12, FMT_D6, AM33, {MEMINC(RM0), RN2}},
+{ "mov", 0xf97a00, 0xffff00, 0, FMT_D6, AM33, {RM2, MEMINC(RN0)}},
+{ "mov", 0xfa000000, 0xfff00000, 0, FMT_D2, 0, {MEM2(SD16, AM0), DN1}},
+{ "mov", 0xfa100000, 0xfff00000, 0, FMT_D2, 0, {DM1, MEM2(SD16, AN0)}},
+{ "mov", 0xfa200000, 0xfff00000, 0, FMT_D2, 0, {MEM2(SD16, AM0), AN1}},
+{ "mov", 0xfa300000, 0xfff00000, 0, FMT_D2, 0, {AM1, MEM2(SD16, AN0)}},
+{ "mov", 0xfb0a0000, 0xffff0000, 0, FMT_D7, AM33, {MEM2(SD8, RM0), RN2}},
+{ "mov", 0xfb1a0000, 0xffff0000, 0, FMT_D7, AM33, {RM2, MEM2(SD8, RN0)}},
+{ "mov", 0xfb6a0000, 0xffff0000, 0x22, FMT_D7, AM33, {MEMINC2 (RM0, SIMM8), RN2}},
+{ "mov", 0xfb7a0000, 0xffff0000, 0, FMT_D7, AM33, {RM2, MEMINC2 (RN0, SIMM8)}},
+{ "mov", 0xfb8e0000, 0xffff000f, 0, FMT_D7, AM33, {MEM2(RI, RM0), RD2}},
+{ "mov", 0xfb9e0000, 0xffff000f, 0, FMT_D7, AM33, {RD2, MEM2(RI, RN0)}},
+{ "mov", 0xfc000000, 0xfff00000, 0, FMT_D4, 0, {MEM2(IMM32,AM0), DN1}},
+{ "mov", 0xfc100000, 0xfff00000, 0, FMT_D4, 0, {DM1, MEM2(IMM32,AN0)}},
+{ "mov", 0xfc200000, 0xfff00000, 0, FMT_D4, 0, {MEM2(IMM32,AM0), AN1}},
+{ "mov", 0xfc300000, 0xfff00000, 0, FMT_D4, 0, {AM1, MEM2(IMM32,AN0)}},
+{ "mov", 0xfd0a0000, 0xffff0000, 0, FMT_D8, AM33, {MEM2(SD24, RM0), RN2}},
+{ "mov", 0xfd1a0000, 0xffff0000, 0, FMT_D8, AM33, {RM2, MEM2(SD24, RN0)}},
+{ "mov", 0xfd6a0000, 0xffff0000, 0x22, FMT_D8, AM33, {MEMINC2 (RM0, IMM24), RN2}},
+{ "mov", 0xfd7a0000, 0xffff0000, 0, FMT_D8, AM33, {RM2, MEMINC2 (RN0, IMM24)}},
+{ "mov", 0xfe0a0000, 0xffff0000, 0, FMT_D9, AM33, {MEM2(IMM32_HIGH8,RM0), RN2}},
+{ "mov", 0xfe1a0000, 0xffff0000, 0, FMT_D9, AM33, {RM2, MEM2(IMM32_HIGH8, RN0)}},
+{ "mov", 0xfe6a0000, 0xffff0000, 0x22, FMT_D9, AM33, {MEMINC2 (RM0, IMM32_HIGH8), RN2}},
+{ "mov", 0xfe7a0000, 0xffff0000, 0, FMT_D9, AM33, {RN2, MEMINC2 (RM0, IMM32_HIGH8)}},
+
+{ "movhu", 0xf060, 0xfff0, 0, FMT_D0, 0, {MEM(AM0), DN1}},
+{ "movhu", 0xf070, 0xfff0, 0, FMT_D0, 0, {DM1, MEM(AN0)}},
+{ "movhu", 0xf480, 0xffc0, 0, FMT_D0, 0, {MEM2(DI, AM0), DN2}},
+{ "movhu", 0xf4c0, 0xffc0, 0, FMT_D0, 0, {DM2, MEM2(DI, AN0)}},
+{ "movhu", 0xf86000, 0xfff000, 0, FMT_D1, 0, {MEM2(SD8, AM0), DN1}},
+{ "movhu", 0xf87000, 0xfff000, 0, FMT_D1, 0, {DM1, MEM2(SD8, AN0)}},
+{ "movhu", 0xf94a00, 0xffff00, 0, FMT_D6, AM33, {MEM(RM0), RN2}},
+{ "movhu", 0xf95a00, 0xffff00, 0, FMT_D6, AM33, {RM2, MEM(RN0)}},
+{ "movhu", 0xf9ea00, 0xffff00, 0x12, FMT_D6, AM33, {MEMINC(RM0), RN2}},
+{ "movhu", 0xf9fa00, 0xffff00, 0, FMT_D6, AM33, {RM2, MEMINC(RN0)}},
+{ "movhu", 0xfa600000, 0xfff00000, 0, FMT_D2, 0, {MEM2(SD16, AM0), DN1}},
+{ "movhu", 0xfa700000, 0xfff00000, 0, FMT_D2, 0, {DM1, MEM2(SD16, AN0)}},
+{ "movhu", 0xfb4a0000, 0xffff0000, 0, FMT_D7, AM33, {MEM2(SD8, RM0), RN2}},
+{ "movhu", 0xfb5a0000, 0xffff0000, 0, FMT_D7, AM33, {RM2, MEM2(SD8, RN0)}},
+{ "movhu", 0xfbce0000, 0xffff000f, 0, FMT_D7, AM33, {MEM2(RI, RM0), RD2}},
+{ "movhu", 0xfbde0000, 0xffff000f, 0, FMT_D7, AM33, {RD2, MEM2(RI, RN0)}},
+{ "movhu", 0xfbea0000, 0xffff0000, 0x22, FMT_D7, AM33, {MEMINC2 (RM0, SIMM8), RN2}},
+{ "movhu", 0xfbfa0000, 0xffff0000, 0, FMT_D7, AM33, {RM2, MEMINC2 (RN0, SIMM8)}},
+{ "movhu", 0xfc600000, 0xfff00000, 0, FMT_D4, 0, {MEM2(IMM32,AM0), DN1}},
+{ "movhu", 0xfc700000, 0xfff00000, 0, FMT_D4, 0, {DM1, MEM2(IMM32,AN0)}},
+{ "movhu", 0xfd4a0000, 0xffff0000, 0, FMT_D8, AM33, {MEM2(SD24, RM0), RN2}},
+{ "movhu", 0xfd5a0000, 0xffff0000, 0, FMT_D8, AM33, {RM2, MEM2(SD24, RN0)}},
+{ "movhu", 0xfdea0000, 0xffff0000, 0x22, FMT_D8, AM33, {MEMINC2 (RM0, IMM24), RN2}},
+{ "movhu", 0xfdfa0000, 0xffff0000, 0, FMT_D8, AM33, {RM2, MEMINC2 (RN0, IMM24)}},
+{ "movhu", 0xfe4a0000, 0xffff0000, 0, FMT_D9, AM33, {MEM2(IMM32_HIGH8,RM0), RN2}},
+{ "movhu", 0xfe5a0000, 0xffff0000, 0, FMT_D9, AM33, {RM2, MEM2(IMM32_HIGH8, RN0)}},
+{ "movhu", 0xfeea0000, 0xffff0000, 0x22, FMT_D9, AM33, {MEMINC2 (RM0, IMM32_HIGH8), RN2}},
+{ "movhu", 0xfefa0000, 0xffff0000, 0, FMT_D9, AM33, {RN2, MEMINC2 (RM0, IMM32_HIGH8)}},
+{ 0, 0, 0, 0, 0, 0, {0}},
+};
+
+/*
+ * fix up misalignment problems where possible
+ */
+asmlinkage void misalignment(struct pt_regs *regs, enum exception_code code)
+{
+ const struct exception_table_entry *fixup;
+ const struct mn10300_opcode *pop;
+ unsigned long *registers = (unsigned long *) regs;
+ unsigned long data, *store, *postinc;
+ mm_segment_t seg;
+ siginfo_t info;
+ uint32_t opcode, disp, noc, xo, xm;
+ uint8_t *pc, byte;
+ void *address;
+ unsigned tmp, npop;
+
+ kdebug("MISALIGN at %lx\n", regs->pc);
+
+ if (in_interrupt())
+ die("Misalignment trap in interrupt context", regs, code);
+
+ if (regs->epsw & EPSW_IE)
+ asm volatile("or %0,epsw" : : "i"(EPSW_IE));
+
+ seg = get_fs();
+ set_fs(KERNEL_DS);
+
+ fixup = search_exception_tables(regs->pc);
+
+ /* first thing to do is to match the opcode */
+ pc = (u_int8_t *) regs->pc;
+
+ if (__get_user(byte, pc) != 0)
+ goto fetch_error;
+ opcode = byte;
+ noc = 8;
+
+ for (pop = mn10300_opcodes; pop->name; pop++) {
+ npop = log2(pop->opcode | pop->opmask);
+ if (npop <= 0 || npop > 31)
+ continue;
+ npop = (npop + 8) & ~7;
+
+ got_more_bits:
+ if (npop == noc) {
+ if ((opcode & pop->opmask) == pop->opcode)
+ goto found_opcode;
+ } else if (npop > noc) {
+ xo = pop->opcode >> (npop - noc);
+ xm = pop->opmask >> (npop - noc);
+
+ if ((opcode & xm) != xo)
+ continue;
+
+ /* we've got a partial match (an exact match on the
+ * first N bytes), so we need to get some more data */
+ pc++;
+ if (__get_user(byte, pc) != 0)
+ goto fetch_error;
+ opcode = opcode << 8 | byte;
+ noc += 8;
+ goto got_more_bits;
+ } else {
+ /* there's already been a partial match as long as the
+ * complete match we're now considering, so this one
+ * should't match */
+ continue;
+ }
+ }
+
+ /* didn't manage to find a fixup */
+ if (!user_mode(regs))
+ printk(KERN_CRIT "MISALIGN: %lx: unsupported instruction %x\n",
+ regs->pc, opcode);
+
+failed:
+ set_fs(seg);
+ if (die_if_no_fixup("misalignment error", regs, code))
+ return;
+
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_ADRALN;
+ info.si_addr = (void *) regs->pc;
+ force_sig_info(SIGBUS, &info, current);
+ return;
+
+ /* error reading opcodes */
+fetch_error:
+ if (!user_mode(regs))
+ printk(KERN_CRIT
+ "MISALIGN: %p: fault whilst reading instruction data\n",
+ pc);
+ goto failed;
+
+bad_addr_mode:
+ if (!user_mode(regs))
+ printk(KERN_CRIT
+ "MISALIGN: %lx: unsupported addressing mode %x\n",
+ regs->pc, opcode);
+ goto failed;
+
+bad_reg_mode:
+ if (!user_mode(regs))
+ printk(KERN_CRIT
+ "MISALIGN: %lx: unsupported register mode %x\n",
+ regs->pc, opcode);
+ goto failed;
+
+unsupported_instruction:
+ if (!user_mode(regs))
+ printk(KERN_CRIT
+ "MISALIGN: %lx: unsupported instruction %x (%s)\n",
+ regs->pc, opcode, pop->name);
+ goto failed;
+
+transfer_failed:
+ set_fs(seg);
+ if (fixup) {
+ regs->pc = fixup->fixup;
+ return;
+ }
+ if (die_if_no_fixup("misalignment fixup", regs, code))
+ return;
+
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ info.si_code = 0;
+ info.si_addr = (void *) regs->pc;
+ force_sig_info(SIGSEGV, &info, current);
+ return;
+
+ /* we matched the opcode */
+found_opcode:
+ kdebug("MISALIGN: %lx: %x==%x { %x, %x }\n",
+ regs->pc, opcode, pop->opcode, pop->params[0], pop->params[1]);
+
+ tmp = format_tbl[pop->format].opsz;
+ if (tmp > noc)
+ BUG(); /* match was less complete than it ought to have been */
+
+ if (tmp < noc) {
+ tmp = noc - tmp;
+ opcode >>= tmp;
+ pc -= tmp >> 3;
+ }
+
+ /* grab the extra displacement (note it's LSB first) */
+ disp = 0;
+ tmp = format_tbl[pop->format].dispsz >> 3;
+ while (tmp > 0) {
+ tmp--;
+ disp <<= 8;
+
+ pc++;
+ if (__get_user(byte, pc) != 0)
+ goto fetch_error;
+ disp |= byte;
+ }
+
+ set_fs(KERNEL_XDS);
+ if (fixup || regs->epsw & EPSW_nSL)
+ set_fs(seg);
+
+ tmp = (pop->params[0] ^ pop->params[1]) & 0x80000000;
+ if (!tmp) {
+ if (!user_mode(regs))
+ printk(KERN_CRIT
+ "MISALIGN: %lx:"
+ " insn not move to/from memory %x\n",
+ regs->pc, opcode);
+ goto failed;
+ }
+
+ if (pop->params[0] & 0x80000000) {
+ /* move memory to register */
+ if (!misalignment_addr(registers, pop->params[0], opcode, disp,
+ &address, &postinc))
+ goto bad_addr_mode;
+
+ if (!misalignment_reg(registers, pop->params[1], opcode, disp,
+ &store))
+ goto bad_reg_mode;
+
+ if (strcmp(pop->name, "mov") == 0) {
+ kdebug("FIXUP: mov (%p),DARn\n", address);
+ if (copy_from_user(&data, (void *) address, 4) != 0)
+ goto transfer_failed;
+ if (pop->params[0] & 0x1000000)
+ *postinc += 4;
+ } else if (strcmp(pop->name, "movhu") == 0) {
+ kdebug("FIXUP: movhu (%p),DARn\n", address);
+ data = 0;
+ if (copy_from_user(&data, (void *) address, 2) != 0)
+ goto transfer_failed;
+ if (pop->params[0] & 0x1000000)
+ *postinc += 2;
+ } else {
+ goto unsupported_instruction;
+ }
+
+ *store = data;
+ } else {
+ /* move register to memory */
+ if (!misalignment_reg(registers, pop->params[0], opcode, disp,
+ &store))
+ goto bad_reg_mode;
+
+ if (!misalignment_addr(registers, pop->params[1], opcode, disp,
+ &address, &postinc))
+ goto bad_addr_mode;
+
+ data = *store;
+
+ if (strcmp(pop->name, "mov") == 0) {
+ kdebug("FIXUP: mov %lx,(%p)\n", data, address);
+ if (copy_to_user((void *) address, &data, 4) != 0)
+ goto transfer_failed;
+ if (pop->params[1] & 0x1000000)
+ *postinc += 4;
+ } else if (strcmp(pop->name, "movhu") == 0) {
+ kdebug("FIXUP: movhu %hx,(%p)\n",
+ (uint16_t) data, address);
+ if (copy_to_user((void *) address, &data, 2) != 0)
+ goto transfer_failed;
+ if (pop->params[1] & 0x1000000)
+ *postinc += 2;
+ } else {
+ goto unsupported_instruction;
+ }
+ }
+
+ tmp = format_tbl[pop->format].opsz + format_tbl[pop->format].dispsz;
+ regs->pc += tmp >> 3;
+
+ set_fs(seg);
+ return;
+}
+
+/*
+ * determine the address that was being accessed
+ */
+static int misalignment_addr(unsigned long *registers, unsigned params,
+ unsigned opcode, unsigned disp,
+ void **_address, unsigned long **_postinc)
+{
+ unsigned long *postinc = NULL, address = 0, tmp;
+
+ params &= 0x7fffffff;
+
+ do {
+ switch (params & 0xff) {
+ case DM0:
+ postinc = &registers[Dreg_index[opcode & 0x03]];
+ address += *postinc;
+ break;
+ case DM1:
+ postinc = &registers[Dreg_index[opcode >> 2 & 0x0c]];
+ address += *postinc;
+ break;
+ case DM2:
+ postinc = &registers[Dreg_index[opcode >> 4 & 0x30]];
+ address += *postinc;
+ break;
+ case AM0:
+ postinc = &registers[Areg_index[opcode & 0x03]];
+ address += *postinc;
+ break;
+ case AM1:
+ postinc = &registers[Areg_index[opcode >> 2 & 0x0c]];
+ address += *postinc;
+ break;
+ case AM2:
+ postinc = &registers[Areg_index[opcode >> 4 & 0x30]];
+ address += *postinc;
+ break;
+ case RM0:
+ postinc = &registers[Rreg_index[opcode & 0x0f]];
+ address += *postinc;
+ break;
+ case RM1:
+ postinc = &registers[Rreg_index[opcode >> 2 & 0x0f]];
+ address += *postinc;
+ break;
+ case RM2:
+ postinc = &registers[Rreg_index[opcode >> 4 & 0x0f]];
+ address += *postinc;
+ break;
+ case RM4:
+ postinc = &registers[Rreg_index[opcode >> 8 & 0x0f]];
+ address += *postinc;
+ break;
+ case RM6:
+ postinc = &registers[Rreg_index[opcode >> 12 & 0x0f]];
+ address += *postinc;
+ break;
+ case RD0:
+ postinc = &registers[Rreg_index[disp & 0x0f]];
+ address += *postinc;
+ break;
+ case RD2:
+ postinc = &registers[Rreg_index[disp >> 4 & 0x0f]];
+ address += *postinc;
+ break;
+
+ case SD8:
+ case SIMM8:
+ address += (int32_t) (int8_t) (disp & 0xff);
+ break;
+ case SD16:
+ address += (int32_t) (int16_t) (disp & 0xffff);
+ break;
+ case SD24:
+ tmp = disp << 8;
+ asm("asr 8,%0" : "=r"(tmp) : "0"(tmp));
+ address += tmp;
+ break;
+ case SIMM4_2:
+ tmp = opcode >> 4 & 0x0f;
+ tmp <<= 28;
+ asm("asr 28,%0" : "=r"(tmp) : "0"(tmp));
+ address += tmp;
+ break;
+ case IMM24:
+ address += disp & 0x00ffffff;
+ break;
+ case IMM32:
+ case IMM32_HIGH8:
+ address += disp;
+ break;
+ default:
+ return 0;
+ }
+ } while ((params >>= 8));
+
+ *_address = (void *) address;
+ *_postinc = postinc;
+ return 1;
+}
+
+/*
+ * determine the register that is acting as source/dest
+ */
+static int misalignment_reg(unsigned long *registers, unsigned params,
+ unsigned opcode, unsigned disp,
+ unsigned long **_register)
+{
+ params &= 0x7fffffff;
+
+ if (params & 0xffffff00)
+ return 0;
+
+ switch (params & 0xff) {
+ case DM0:
+ *_register = &registers[Dreg_index[opcode & 0x03]];
+ break;
+ case DM1:
+ *_register = &registers[Dreg_index[opcode >> 2 & 0x03]];
+ break;
+ case DM2:
+ *_register = &registers[Dreg_index[opcode >> 4 & 0x03]];
+ break;
+ case AM0:
+ *_register = &registers[Areg_index[opcode & 0x03]];
+ break;
+ case AM1:
+ *_register = &registers[Areg_index[opcode >> 2 & 0x03]];
+ break;
+ case AM2:
+ *_register = &registers[Areg_index[opcode >> 4 & 0x03]];
+ break;
+ case RM0:
+ *_register = &registers[Rreg_index[opcode & 0x0f]];
+ break;
+ case RM1:
+ *_register = &registers[Rreg_index[opcode >> 2 & 0x0f]];
+ break;
+ case RM2:
+ *_register = &registers[Rreg_index[opcode >> 4 & 0x0f]];
+ break;
+ case RM4:
+ *_register = &registers[Rreg_index[opcode >> 8 & 0x0f]];
+ break;
+ case RM6:
+ *_register = &registers[Rreg_index[opcode >> 12 & 0x0f]];
+ break;
+ case RD0:
+ *_register = &registers[Rreg_index[disp & 0x0f]];
+ break;
+ case RD2:
+ *_register = &registers[Rreg_index[disp >> 4 & 0x0f]];
+ break;
+ case SP:
+ *_register = &registers[REG_SP >> 2];
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-05 02:53:15 +0000