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-rw-r--r--arch/sh/kernel/traps_64.c975
1 files changed, 975 insertions, 0 deletions
diff --git a/arch/sh/kernel/traps_64.c b/arch/sh/kernel/traps_64.c
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index 000000000000..c0b3c6f6edb5
--- /dev/null
+++ b/arch/sh/kernel/traps_64.c
@@ -0,0 +1,975 @@
+/*
+ * arch/sh/kernel/traps_64.c
+ *
+ * Copyright (C) 2000, 2001 Paolo Alberelli
+ * Copyright (C) 2003, 2004 Paul Mundt
+ * Copyright (C) 2003, 2004 Richard Curnow
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#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/init.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/kallsyms.h>
+#include <linux/interrupt.h>
+#include <linux/sysctl.h>
+#include <linux/module.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+#include <asm/processor.h>
+#include <asm/pgtable.h>
+
+#undef DEBUG_EXCEPTION
+#ifdef DEBUG_EXCEPTION
+/* implemented in ../lib/dbg.c */
+extern void show_excp_regs(char *fname, int trapnr, int signr,
+ struct pt_regs *regs);
+#else
+#define show_excp_regs(a, b, c, d)
+#endif
+
+static void do_unhandled_exception(int trapnr, int signr, char *str, char *fn_name,
+ unsigned long error_code, struct pt_regs *regs, struct task_struct *tsk);
+
+#define DO_ERROR(trapnr, signr, str, name, tsk) \
+asmlinkage void do_##name(unsigned long error_code, struct pt_regs *regs) \
+{ \
+ do_unhandled_exception(trapnr, signr, str, __stringify(name), error_code, regs, current); \
+}
+
+spinlock_t die_lock;
+
+void die(const char * str, struct pt_regs * regs, long err)
+{
+ console_verbose();
+ spin_lock_irq(&die_lock);
+ printk("%s: %lx\n", str, (err & 0xffffff));
+ show_regs(regs);
+ spin_unlock_irq(&die_lock);
+ do_exit(SIGSEGV);
+}
+
+static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err)
+{
+ if (!user_mode(regs))
+ die(str, regs, err);
+}
+
+static void die_if_no_fixup(const char * str, struct pt_regs * regs, long err)
+{
+ if (!user_mode(regs)) {
+ const struct exception_table_entry *fixup;
+ fixup = search_exception_tables(regs->pc);
+ if (fixup) {
+ regs->pc = fixup->fixup;
+ return;
+ }
+ die(str, regs, err);
+ }
+}
+
+DO_ERROR(13, SIGILL, "illegal slot instruction", illegal_slot_inst, current)
+DO_ERROR(87, SIGSEGV, "address error (exec)", address_error_exec, current)
+
+
+/* Implement misaligned load/store handling for kernel (and optionally for user
+ mode too). Limitation : only SHmedia mode code is handled - there is no
+ handling at all for misaligned accesses occurring in SHcompact code yet. */
+
+static int misaligned_fixup(struct pt_regs *regs);
+
+asmlinkage void do_address_error_load(unsigned long error_code, struct pt_regs *regs)
+{
+ if (misaligned_fixup(regs) < 0) {
+ do_unhandled_exception(7, SIGSEGV, "address error(load)",
+ "do_address_error_load",
+ error_code, regs, current);
+ }
+ return;
+}
+
+asmlinkage void do_address_error_store(unsigned long error_code, struct pt_regs *regs)
+{
+ if (misaligned_fixup(regs) < 0) {
+ do_unhandled_exception(8, SIGSEGV, "address error(store)",
+ "do_address_error_store",
+ error_code, regs, current);
+ }
+ return;
+}
+
+#if defined(CONFIG_SH64_ID2815_WORKAROUND)
+
+#define OPCODE_INVALID 0
+#define OPCODE_USER_VALID 1
+#define OPCODE_PRIV_VALID 2
+
+/* getcon/putcon - requires checking which control register is referenced. */
+#define OPCODE_CTRL_REG 3
+
+/* Table of valid opcodes for SHmedia mode.
+ Form a 10-bit value by concatenating the major/minor opcodes i.e.
+ opcode[31:26,20:16]. The 6 MSBs of this value index into the following
+ array. The 4 LSBs select the bit-pair in the entry (bits 1:0 correspond to
+ LSBs==4'b0000 etc). */
+static unsigned long shmedia_opcode_table[64] = {
+ 0x55554044,0x54445055,0x15141514,0x14541414,0x00000000,0x10001000,0x01110055,0x04050015,
+ 0x00000444,0xc0000000,0x44545515,0x40405555,0x55550015,0x10005555,0x55555505,0x04050000,
+ 0x00000555,0x00000404,0x00040445,0x15151414,0x00000000,0x00000000,0x00000000,0x00000000,
+ 0x00000055,0x40404444,0x00000404,0xc0009495,0x00000000,0x00000000,0x00000000,0x00000000,
+ 0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
+ 0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
+ 0x80005050,0x04005055,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,0x55555555,
+ 0x81055554,0x00000404,0x55555555,0x55555555,0x00000000,0x00000000,0x00000000,0x00000000
+};
+
+void do_reserved_inst(unsigned long error_code, struct pt_regs *regs)
+{
+ /* Workaround SH5-101 cut2 silicon defect #2815 :
+ in some situations, inter-mode branches from SHcompact -> SHmedia
+ which should take ITLBMISS or EXECPROT exceptions at the target
+ falsely take RESINST at the target instead. */
+
+ unsigned long opcode = 0x6ff4fff0; /* guaranteed reserved opcode */
+ unsigned long pc, aligned_pc;
+ int get_user_error;
+ int trapnr = 12;
+ int signr = SIGILL;
+ char *exception_name = "reserved_instruction";
+
+ pc = regs->pc;
+ if ((pc & 3) == 1) {
+ /* SHmedia : check for defect. This requires executable vmas
+ to be readable too. */
+ aligned_pc = pc & ~3;
+ if (!access_ok(VERIFY_READ, aligned_pc, sizeof(unsigned long))) {
+ get_user_error = -EFAULT;
+ } else {
+ get_user_error = __get_user(opcode, (unsigned long *)aligned_pc);
+ }
+ if (get_user_error >= 0) {
+ unsigned long index, shift;
+ unsigned long major, minor, combined;
+ unsigned long reserved_field;
+ reserved_field = opcode & 0xf; /* These bits are currently reserved as zero in all valid opcodes */
+ major = (opcode >> 26) & 0x3f;
+ minor = (opcode >> 16) & 0xf;
+ combined = (major << 4) | minor;
+ index = major;
+ shift = minor << 1;
+ if (reserved_field == 0) {
+ int opcode_state = (shmedia_opcode_table[index] >> shift) & 0x3;
+ switch (opcode_state) {
+ case OPCODE_INVALID:
+ /* Trap. */
+ break;
+ case OPCODE_USER_VALID:
+ /* Restart the instruction : the branch to the instruction will now be from an RTE
+ not from SHcompact so the silicon defect won't be triggered. */
+ return;
+ case OPCODE_PRIV_VALID:
+ if (!user_mode(regs)) {
+ /* Should only ever get here if a module has
+ SHcompact code inside it. If so, the same fix up is needed. */
+ return; /* same reason */
+ }
+ /* Otherwise, user mode trying to execute a privileged instruction -
+ fall through to trap. */
+ break;
+ case OPCODE_CTRL_REG:
+ /* If in privileged mode, return as above. */
+ if (!user_mode(regs)) return;
+ /* In user mode ... */
+ if (combined == 0x9f) { /* GETCON */
+ unsigned long regno = (opcode >> 20) & 0x3f;
+ if (regno >= 62) {
+ return;
+ }
+ /* Otherwise, reserved or privileged control register, => trap */
+ } else if (combined == 0x1bf) { /* PUTCON */
+ unsigned long regno = (opcode >> 4) & 0x3f;
+ if (regno >= 62) {
+ return;
+ }
+ /* Otherwise, reserved or privileged control register, => trap */
+ } else {
+ /* Trap */
+ }
+ break;
+ default:
+ /* Fall through to trap. */
+ break;
+ }
+ }
+ /* fall through to normal resinst processing */
+ } else {
+ /* Error trying to read opcode. This typically means a
+ real fault, not a RESINST any more. So change the
+ codes. */
+ trapnr = 87;
+ exception_name = "address error (exec)";
+ signr = SIGSEGV;
+ }
+ }
+
+ do_unhandled_exception(trapnr, signr, exception_name, "do_reserved_inst", error_code, regs, current);
+}
+
+#else /* CONFIG_SH64_ID2815_WORKAROUND */
+
+/* If the workaround isn't needed, this is just a straightforward reserved
+ instruction */
+DO_ERROR(12, SIGILL, "reserved instruction", reserved_inst, current)
+
+#endif /* CONFIG_SH64_ID2815_WORKAROUND */
+
+/* Called with interrupts disabled */
+asmlinkage void do_exception_error(unsigned long ex, struct pt_regs *regs)
+{
+ show_excp_regs(__FUNCTION__, -1, -1, regs);
+ die_if_kernel("exception", regs, ex);
+}
+
+int do_unknown_trapa(unsigned long scId, struct pt_regs *regs)
+{
+ /* Syscall debug */
+ printk("System call ID error: [0x1#args:8 #syscall:16 0x%lx]\n", scId);
+
+ die_if_kernel("unknown trapa", regs, scId);
+
+ return -ENOSYS;
+}
+
+void show_stack(struct task_struct *tsk, unsigned long *sp)
+{
+#ifdef CONFIG_KALLSYMS
+ extern void sh64_unwind(struct pt_regs *regs);
+ struct pt_regs *regs;
+
+ regs = tsk ? tsk->thread.kregs : NULL;
+
+ sh64_unwind(regs);
+#else
+ printk(KERN_ERR "Can't backtrace on sh64 without CONFIG_KALLSYMS\n");
+#endif
+}
+
+void show_task(unsigned long *sp)
+{
+ show_stack(NULL, sp);
+}
+
+void dump_stack(void)
+{
+ show_task(NULL);
+}
+/* Needed by any user of WARN_ON in view of the defn in include/asm-sh/bug.h */
+EXPORT_SYMBOL(dump_stack);
+
+static void do_unhandled_exception(int trapnr, int signr, char *str, char *fn_name,
+ unsigned long error_code, struct pt_regs *regs, struct task_struct *tsk)
+{
+ show_excp_regs(fn_name, trapnr, signr, regs);
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = trapnr;
+
+ if (user_mode(regs))
+ force_sig(signr, tsk);
+
+ die_if_no_fixup(str, regs, error_code);
+}
+
+static int read_opcode(unsigned long long pc, unsigned long *result_opcode, int from_user_mode)
+{
+ int get_user_error;
+ unsigned long aligned_pc;
+ unsigned long opcode;
+
+ if ((pc & 3) == 1) {
+ /* SHmedia */
+ aligned_pc = pc & ~3;
+ if (from_user_mode) {
+ if (!access_ok(VERIFY_READ, aligned_pc, sizeof(unsigned long))) {
+ get_user_error = -EFAULT;
+ } else {
+ get_user_error = __get_user(opcode, (unsigned long *)aligned_pc);
+ *result_opcode = opcode;
+ }
+ return get_user_error;
+ } else {
+ /* If the fault was in the kernel, we can either read
+ * this directly, or if not, we fault.
+ */
+ *result_opcode = *(unsigned long *) aligned_pc;
+ return 0;
+ }
+ } else if ((pc & 1) == 0) {
+ /* SHcompact */
+ /* TODO : provide handling for this. We don't really support
+ user-mode SHcompact yet, and for a kernel fault, this would
+ have to come from a module built for SHcompact. */
+ return -EFAULT;
+ } else {
+ /* misaligned */
+ return -EFAULT;
+ }
+}
+
+static int address_is_sign_extended(__u64 a)
+{
+ __u64 b;
+#if (NEFF == 32)
+ b = (__u64)(__s64)(__s32)(a & 0xffffffffUL);
+ return (b == a) ? 1 : 0;
+#else
+#error "Sign extend check only works for NEFF==32"
+#endif
+}
+
+static int generate_and_check_address(struct pt_regs *regs,
+ __u32 opcode,
+ int displacement_not_indexed,
+ int width_shift,
+ __u64 *address)
+{
+ /* return -1 for fault, 0 for OK */
+
+ __u64 base_address, addr;
+ int basereg;
+
+ basereg = (opcode >> 20) & 0x3f;
+ base_address = regs->regs[basereg];
+ if (displacement_not_indexed) {
+ __s64 displacement;
+ displacement = (opcode >> 10) & 0x3ff;
+ displacement = ((displacement << 54) >> 54); /* sign extend */
+ addr = (__u64)((__s64)base_address + (displacement << width_shift));
+ } else {
+ __u64 offset;
+ int offsetreg;
+ offsetreg = (opcode >> 10) & 0x3f;
+ offset = regs->regs[offsetreg];
+ addr = base_address + offset;
+ }
+
+ /* Check sign extended */
+ if (!address_is_sign_extended(addr)) {
+ return -1;
+ }
+
+#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+ /* Check accessible. For misaligned access in the kernel, assume the
+ address is always accessible (and if not, just fault when the
+ load/store gets done.) */
+ if (user_mode(regs)) {
+ if (addr >= TASK_SIZE) {
+ return -1;
+ }
+ /* Do access_ok check later - it depends on whether it's a load or a store. */
+ }
+#endif
+
+ *address = addr;
+ return 0;
+}
+
+/* Default value as for sh */
+#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+static int user_mode_unaligned_fixup_count = 10;
+static int user_mode_unaligned_fixup_enable = 1;
+#endif
+
+static int kernel_mode_unaligned_fixup_count = 32;
+
+static void misaligned_kernel_word_load(__u64 address, int do_sign_extend, __u64 *result)
+{
+ unsigned short x;
+ unsigned char *p, *q;
+ p = (unsigned char *) (int) address;
+ q = (unsigned char *) &x;
+ q[0] = p[0];
+ q[1] = p[1];
+
+ if (do_sign_extend) {
+ *result = (__u64)(__s64) *(short *) &x;
+ } else {
+ *result = (__u64) x;
+ }
+}
+
+static void misaligned_kernel_word_store(__u64 address, __u64 value)
+{
+ unsigned short x;
+ unsigned char *p, *q;
+ p = (unsigned char *) (int) address;
+ q = (unsigned char *) &x;
+
+ x = (__u16) value;
+ p[0] = q[0];
+ p[1] = q[1];
+}
+
+static int misaligned_load(struct pt_regs *regs,
+ __u32 opcode,
+ int displacement_not_indexed,
+ int width_shift,
+ int do_sign_extend)
+{
+ /* Return -1 for a fault, 0 for OK */
+ int error;
+ int destreg;
+ __u64 address;
+
+ error = generate_and_check_address(regs, opcode,
+ displacement_not_indexed, width_shift, &address);
+ if (error < 0) {
+ return error;
+ }
+
+ destreg = (opcode >> 4) & 0x3f;
+#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+ if (user_mode(regs)) {
+ __u64 buffer;
+
+ if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
+ return -1;
+ }
+
+ if (__copy_user(&buffer, (const void *)(int)address, (1 << width_shift)) > 0) {
+ return -1; /* fault */
+ }
+ switch (width_shift) {
+ case 1:
+ if (do_sign_extend) {
+ regs->regs[destreg] = (__u64)(__s64) *(__s16 *) &buffer;
+ } else {
+ regs->regs[destreg] = (__u64) *(__u16 *) &buffer;
+ }
+ break;
+ case 2:
+ regs->regs[destreg] = (__u64)(__s64) *(__s32 *) &buffer;
+ break;
+ case 3:
+ regs->regs[destreg] = buffer;
+ break;
+ default:
+ printk("Unexpected width_shift %d in misaligned_load, PC=%08lx\n",
+ width_shift, (unsigned long) regs->pc);
+ break;
+ }
+ } else
+#endif
+ {
+ /* kernel mode - we can take short cuts since if we fault, it's a genuine bug */
+ __u64 lo, hi;
+
+ switch (width_shift) {
+ case 1:
+ misaligned_kernel_word_load(address, do_sign_extend, &regs->regs[destreg]);
+ break;
+ case 2:
+ asm ("ldlo.l %1, 0, %0" : "=r" (lo) : "r" (address));
+ asm ("ldhi.l %1, 3, %0" : "=r" (hi) : "r" (address));
+ regs->regs[destreg] = lo | hi;
+ break;
+ case 3:
+ asm ("ldlo.q %1, 0, %0" : "=r" (lo) : "r" (address));
+ asm ("ldhi.q %1, 7, %0" : "=r" (hi) : "r" (address));
+ regs->regs[destreg] = lo | hi;
+ break;
+
+ default:
+ printk("Unexpected width_shift %d in misaligned_load, PC=%08lx\n",
+ width_shift, (unsigned long) regs->pc);
+ break;
+ }
+ }
+
+ return 0;
+
+}
+
+static int misaligned_store(struct pt_regs *regs,
+ __u32 opcode,
+ int displacement_not_indexed,
+ int width_shift)
+{
+ /* Return -1 for a fault, 0 for OK */
+ int error;
+ int srcreg;
+ __u64 address;
+
+ error = generate_and_check_address(regs, opcode,
+ displacement_not_indexed, width_shift, &address);
+ if (error < 0) {
+ return error;
+ }
+
+ srcreg = (opcode >> 4) & 0x3f;
+#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+ if (user_mode(regs)) {
+ __u64 buffer;
+
+ if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
+ return -1;
+ }
+
+ switch (width_shift) {
+ case 1:
+ *(__u16 *) &buffer = (__u16) regs->regs[srcreg];
+ break;
+ case 2:
+ *(__u32 *) &buffer = (__u32) regs->regs[srcreg];
+ break;
+ case 3:
+ buffer = regs->regs[srcreg];
+ break;
+ default:
+ printk("Unexpected width_shift %d in misaligned_store, PC=%08lx\n",
+ width_shift, (unsigned long) regs->pc);
+ break;
+ }
+
+ if (__copy_user((void *)(int)address, &buffer, (1 << width_shift)) > 0) {
+ return -1; /* fault */
+ }
+ } else
+#endif
+ {
+ /* kernel mode - we can take short cuts since if we fault, it's a genuine bug */
+ __u64 val = regs->regs[srcreg];
+
+ switch (width_shift) {
+ case 1:
+ misaligned_kernel_word_store(address, val);
+ break;
+ case 2:
+ asm ("stlo.l %1, 0, %0" : : "r" (val), "r" (address));
+ asm ("sthi.l %1, 3, %0" : : "r" (val), "r" (address));
+ break;
+ case 3:
+ asm ("stlo.q %1, 0, %0" : : "r" (val), "r" (address));
+ asm ("sthi.q %1, 7, %0" : : "r" (val), "r" (address));
+ break;
+
+ default:
+ printk("Unexpected width_shift %d in misaligned_store, PC=%08lx\n",
+ width_shift, (unsigned long) regs->pc);
+ break;
+ }
+ }
+
+ return 0;
+
+}
+
+#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+/* Never need to fix up misaligned FPU accesses within the kernel since that's a real
+ error. */
+static int misaligned_fpu_load(struct pt_regs *regs,
+ __u32 opcode,
+ int displacement_not_indexed,
+ int width_shift,
+ int do_paired_load)
+{
+ /* Return -1 for a fault, 0 for OK */
+ int error;
+ int destreg;
+ __u64 address;
+
+ error = generate_and_check_address(regs, opcode,
+ displacement_not_indexed, width_shift, &address);
+ if (error < 0) {
+ return error;
+ }
+
+ destreg = (opcode >> 4) & 0x3f;
+ if (user_mode(regs)) {
+ __u64 buffer;
+ __u32 buflo, bufhi;
+
+ if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
+ return -1;
+ }
+
+ if (__copy_user(&buffer, (const void *)(int)address, (1 << width_shift)) > 0) {
+ return -1; /* fault */
+ }
+ /* 'current' may be the current owner of the FPU state, so
+ context switch the registers into memory so they can be
+ indexed by register number. */
+ if (last_task_used_math == current) {
+ enable_fpu();
+ save_fpu(current, regs);
+ disable_fpu();
+ last_task_used_math = NULL;
+ regs->sr |= SR_FD;
+ }
+
+ buflo = *(__u32*) &buffer;
+ bufhi = *(1 + (__u32*) &buffer);
+
+ switch (width_shift) {
+ case 2:
+ current->thread.fpu.hard.fp_regs[destreg] = buflo;
+ break;
+ case 3:
+ if (do_paired_load) {
+ current->thread.fpu.hard.fp_regs[destreg] = buflo;
+ current->thread.fpu.hard.fp_regs[destreg+1] = bufhi;
+ } else {
+#if defined(CONFIG_LITTLE_ENDIAN)
+ current->thread.fpu.hard.fp_regs[destreg] = bufhi;
+ current->thread.fpu.hard.fp_regs[destreg+1] = buflo;
+#else
+ current->thread.fpu.hard.fp_regs[destreg] = buflo;
+ current->thread.fpu.hard.fp_regs[destreg+1] = bufhi;
+#endif
+ }
+ break;
+ default:
+ printk("Unexpected width_shift %d in misaligned_fpu_load, PC=%08lx\n",
+ width_shift, (unsigned long) regs->pc);
+ break;
+ }
+ return 0;
+ } else {
+ die ("Misaligned FPU load inside kernel", regs, 0);
+ return -1;
+ }
+
+
+}
+
+static int misaligned_fpu_store(struct pt_regs *regs,
+ __u32 opcode,
+ int displacement_not_indexed,
+ int width_shift,
+ int do_paired_load)
+{
+ /* Return -1 for a fault, 0 for OK */
+ int error;
+ int srcreg;
+ __u64 address;
+
+ error = generate_and_check_address(regs, opcode,
+ displacement_not_indexed, width_shift, &address);
+ if (error < 0) {
+ return error;
+ }
+
+ srcreg = (opcode >> 4) & 0x3f;
+ if (user_mode(regs)) {
+ __u64 buffer;
+ /* Initialise these to NaNs. */
+ __u32 buflo=0xffffffffUL, bufhi=0xffffffffUL;
+
+ if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
+ return -1;
+ }
+
+ /* 'current' may be the current owner of the FPU state, so
+ context switch the registers into memory so they can be
+ indexed by register number. */
+ if (last_task_used_math == current) {
+ enable_fpu();
+ save_fpu(current, regs);
+ disable_fpu();
+ last_task_used_math = NULL;
+ regs->sr |= SR_FD;
+ }
+
+ switch (width_shift) {
+ case 2:
+ buflo = current->thread.fpu.hard.fp_regs[srcreg];
+ break;
+ case 3:
+ if (do_paired_load) {
+ buflo = current->thread.fpu.hard.fp_regs[srcreg];
+ bufhi = current->thread.fpu.hard.fp_regs[srcreg+1];
+ } else {
+#if defined(CONFIG_LITTLE_ENDIAN)
+ bufhi = current->thread.fpu.hard.fp_regs[srcreg];
+ buflo = current->thread.fpu.hard.fp_regs[srcreg+1];
+#else
+ buflo = current->thread.fpu.hard.fp_regs[srcreg];
+ bufhi = current->thread.fpu.hard.fp_regs[srcreg+1];
+#endif
+ }
+ break;
+ default:
+ printk("Unexpected width_shift %d in misaligned_fpu_store, PC=%08lx\n",
+ width_shift, (unsigned long) regs->pc);
+ break;
+ }
+
+ *(__u32*) &buffer = buflo;
+ *(1 + (__u32*) &buffer) = bufhi;
+ if (__copy_user((void *)(int)address, &buffer, (1 << width_shift)) > 0) {
+ return -1; /* fault */
+ }
+ return 0;
+ } else {
+ die ("Misaligned FPU load inside kernel", regs, 0);
+ return -1;
+ }
+}
+#endif
+
+static int misaligned_fixup(struct pt_regs *regs)
+{
+ unsigned long opcode;
+ int error;
+ int major, minor;
+
+#if !defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+ /* Never fixup user mode misaligned accesses without this option enabled. */
+ return -1;
+#else
+ if (!user_mode_unaligned_fixup_enable) return -1;
+#endif
+
+ error = read_opcode(regs->pc, &opcode, user_mode(regs));
+ if (error < 0) {
+ return error;
+ }
+ major = (opcode >> 26) & 0x3f;
+ minor = (opcode >> 16) & 0xf;
+
+#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+ if (user_mode(regs) && (user_mode_unaligned_fixup_count > 0)) {
+ --user_mode_unaligned_fixup_count;
+ /* Only do 'count' worth of these reports, to remove a potential DoS against syslog */
+ printk("Fixing up unaligned userspace access in \"%s\" pid=%d pc=0x%08x ins=0x%08lx\n",
+ current->comm, task_pid_nr(current), (__u32)regs->pc, opcode);
+ } else
+#endif
+ if (!user_mode(regs) && (kernel_mode_unaligned_fixup_count > 0)) {
+ --kernel_mode_unaligned_fixup_count;
+ if (in_interrupt()) {
+ printk("Fixing up unaligned kernelspace access in interrupt pc=0x%08x ins=0x%08lx\n",
+ (__u32)regs->pc, opcode);
+ } else {
+ printk("Fixing up unaligned kernelspace access in \"%s\" pid=%d pc=0x%08x ins=0x%08lx\n",
+ current->comm, task_pid_nr(current), (__u32)regs->pc, opcode);
+ }
+ }
+
+
+ switch (major) {
+ case (0x84>>2): /* LD.W */
+ error = misaligned_load(regs, opcode, 1, 1, 1);
+ break;
+ case (0xb0>>2): /* LD.UW */
+ error = misaligned_load(regs, opcode, 1, 1, 0);
+ break;
+ case (0x88>>2): /* LD.L */
+ error = misaligned_load(regs, opcode, 1, 2, 1);
+ break;
+ case (0x8c>>2): /* LD.Q */
+ error = misaligned_load(regs, opcode, 1, 3, 0);
+ break;
+
+ case (0xa4>>2): /* ST.W */
+ error = misaligned_store(regs, opcode, 1, 1);
+ break;
+ case (0xa8>>2): /* ST.L */
+ error = misaligned_store(regs, opcode, 1, 2);
+ break;
+ case (0xac>>2): /* ST.Q */
+ error = misaligned_store(regs, opcode, 1, 3);
+ break;
+
+ case (0x40>>2): /* indexed loads */
+ switch (minor) {
+ case 0x1: /* LDX.W */
+ error = misaligned_load(regs, opcode, 0, 1, 1);
+ break;
+ case 0x5: /* LDX.UW */
+ error = misaligned_load(regs, opcode, 0, 1, 0);
+ break;
+ case 0x2: /* LDX.L */
+ error = misaligned_load(regs, opcode, 0, 2, 1);
+ break;
+ case 0x3: /* LDX.Q */
+ error = misaligned_load(regs, opcode, 0, 3, 0);
+ break;
+ default:
+ error = -1;
+ break;
+ }
+ break;
+
+ case (0x60>>2): /* indexed stores */
+ switch (minor) {
+ case 0x1: /* STX.W */
+ error = misaligned_store(regs, opcode, 0, 1);
+ break;
+ case 0x2: /* STX.L */
+ error = misaligned_store(regs, opcode, 0, 2);
+ break;
+ case 0x3: /* STX.Q */
+ error = misaligned_store(regs, opcode, 0, 3);
+ break;
+ default:
+ error = -1;
+ break;
+ }
+ break;
+
+#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+ case (0x94>>2): /* FLD.S */
+ error = misaligned_fpu_load(regs, opcode, 1, 2, 0);
+ break;
+ case (0x98>>2): /* FLD.P */
+ error = misaligned_fpu_load(regs, opcode, 1, 3, 1);
+ break;
+ case (0x9c>>2): /* FLD.D */
+ error = misaligned_fpu_load(regs, opcode, 1, 3, 0);
+ break;
+ case (0x1c>>2): /* floating indexed loads */
+ switch (minor) {
+ case 0x8: /* FLDX.S */
+ error = misaligned_fpu_load(regs, opcode, 0, 2, 0);
+ break;
+ case 0xd: /* FLDX.P */
+ error = misaligned_fpu_load(regs, opcode, 0, 3, 1);
+ break;
+ case 0x9: /* FLDX.D */
+ error = misaligned_fpu_load(regs, opcode, 0, 3, 0);
+ break;
+ default:
+ error = -1;
+ break;
+ }
+ break;
+ case (0xb4>>2): /* FLD.S */
+ error = misaligned_fpu_store(regs, opcode, 1, 2, 0);
+ break;
+ case (0xb8>>2): /* FLD.P */
+ error = misaligned_fpu_store(regs, opcode, 1, 3, 1);
+ break;
+ case (0xbc>>2): /* FLD.D */
+ error = misaligned_fpu_store(regs, opcode, 1, 3, 0);
+ break;
+ case (0x3c>>2): /* floating indexed stores */
+ switch (minor) {
+ case 0x8: /* FSTX.S */
+ error = misaligned_fpu_store(regs, opcode, 0, 2, 0);
+ break;
+ case 0xd: /* FSTX.P */
+ error = misaligned_fpu_store(regs, opcode, 0, 3, 1);
+ break;
+ case 0x9: /* FSTX.D */
+ error = misaligned_fpu_store(regs, opcode, 0, 3, 0);
+ break;
+ default:
+ error = -1;
+ break;
+ }
+ break;
+#endif
+
+ default:
+ /* Fault */
+ error = -1;
+ break;
+ }
+
+ if (error < 0) {
+ return error;
+ } else {
+ regs->pc += 4; /* Skip the instruction that's just been emulated */
+ return 0;
+ }
+
+}
+
+static ctl_table unaligned_table[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "kernel_reports",
+ .data = &kernel_mode_unaligned_fixup_count,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec
+ },
+#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "user_reports",
+ .data = &user_mode_unaligned_fixup_count,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "user_enable",
+ .data = &user_mode_unaligned_fixup_enable,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec},
+#endif
+ {}
+};
+
+static ctl_table unaligned_root[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "unaligned_fixup",
+ .mode = 0555,
+ unaligned_table
+ },
+ {}
+};
+
+static ctl_table sh64_root[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "sh64",
+ .mode = 0555,
+ .child = unaligned_root
+ },
+ {}
+};
+static struct ctl_table_header *sysctl_header;
+static int __init init_sysctl(void)
+{
+ sysctl_header = register_sysctl_table(sh64_root);
+ return 0;
+}
+
+__initcall(init_sysctl);
+
+
+asmlinkage void do_debug_interrupt(unsigned long code, struct pt_regs *regs)
+{
+ u64 peek_real_address_q(u64 addr);
+ u64 poke_real_address_q(u64 addr, u64 val);
+ unsigned long long DM_EXP_CAUSE_PHY = 0x0c100010;
+ unsigned long long exp_cause;
+ /* It's not worth ioremapping the debug module registers for the amount
+ of access we make to them - just go direct to their physical
+ addresses. */
+ exp_cause = peek_real_address_q(DM_EXP_CAUSE_PHY);
+ if (exp_cause & ~4) {
+ printk("DM.EXP_CAUSE had unexpected bits set (=%08lx)\n",
+ (unsigned long)(exp_cause & 0xffffffff));
+ }
+ show_state();
+ /* Clear all DEBUGINT causes */
+ poke_real_address_q(DM_EXP_CAUSE_PHY, 0x0);
+}
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-27 01:46:36 +0000