Initial import

1 files changed, 261 insertions, 0 deletions

diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
new file mode 100644
index 000000000..682b24786
--- /dev/null
+++ b/arch/avr32/kernel/traps.c
@@ -0,0 +1,261 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/bug.h>
+#include <linux/hardirq.h>
+#include <linux/init.h>
+#include <linux/kallsyms.h>
+#include <linux/kdebug.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+
+#include <asm/addrspace.h>
+#include <asm/mmu_context.h>
+#include <asm/ocd.h>
+#include <asm/sysreg.h>
+#include <asm/traps.h>
+
+static DEFINE_SPINLOCK(die_lock);
+
+void die(const char *str, struct pt_regs *regs, long err)
+{
+	static int die_counter;
+
+	console_verbose();
+	spin_lock_irq(&die_lock);
+	bust_spinlocks(1);
+
+	printk(KERN_ALERT "Oops: %s, sig: %ld [#%d]\n",
+	       str, err, ++die_counter);
+
+	printk(KERN_EMERG);
+
+#ifdef CONFIG_PREEMPT
+	printk(KERN_CONT "PREEMPT ");
+#endif
+#ifdef CONFIG_FRAME_POINTER
+	printk(KERN_CONT "FRAME_POINTER ");
+#endif
+	if (current_cpu_data.features & AVR32_FEATURE_OCD) {
+		unsigned long did = ocd_read(DID);
+		printk(KERN_CONT "chip: 0x%03lx:0x%04lx rev %lu\n",
+		       (did >> 1) & 0x7ff,
+		       (did >> 12) & 0x7fff,
+		       (did >> 28) & 0xf);
+	} else {
+		printk(KERN_CONT "cpu: arch %u r%u / core %u r%u\n",
+		       current_cpu_data.arch_type,
+		       current_cpu_data.arch_revision,
+		       current_cpu_data.cpu_type,
+		       current_cpu_data.cpu_revision);
+	}
+
+	print_modules();
+	show_regs_log_lvl(regs, KERN_EMERG);
+	show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG);
+	bust_spinlocks(0);
+	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
+	spin_unlock_irq(&die_lock);
+
+	if (in_interrupt())
+		panic("Fatal exception in interrupt");
+
+	if (panic_on_oops)
+		panic("Fatal exception");
+
+	do_exit(err);
+}
+
+void _exception(long signr, struct pt_regs *regs, int code,
+		unsigned long addr)
+{
+	siginfo_t info;
+
+	if (!user_mode(regs)) {
+		const struct exception_table_entry *fixup;
+
+		/* Are we prepared to handle this kernel fault? */
+		fixup = search_exception_tables(regs->pc);
+		if (fixup) {
+			regs->pc = fixup->fixup;
+			return;
+		}
+		die("Unhandled exception in kernel mode", regs, signr);
+	}
+
+	memset(&info, 0, sizeof(info));
+	info.si_signo = signr;
+	info.si_code = code;
+	info.si_addr = (void __user *)addr;
+	force_sig_info(signr, &info, current);
+}
+
+asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
+{
+	int ret;
+
+	nmi_enter();
+
+	ret = notify_die(DIE_NMI, "NMI", regs, 0, ecr, SIGINT);
+	switch (ret) {
+	case NOTIFY_OK:
+	case NOTIFY_STOP:
+		break;
+	case NOTIFY_BAD:
+		die("Fatal Non-Maskable Interrupt", regs, SIGINT);
+	default:
+		printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n");
+		nmi_disable();
+		break;
+	}
+	nmi_exit();
+}
+
+asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
+{
+	die("Critical exception", regs, SIGKILL);
+}
+
+asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs)
+{
+	_exception(SIGBUS, regs, BUS_ADRALN, regs->pc);
+}
+
+/* This way of handling undefined instructions is stolen from ARM */
+static LIST_HEAD(undef_hook);
+static DEFINE_SPINLOCK(undef_lock);
+
+void register_undef_hook(struct undef_hook *hook)
+{
+	spin_lock_irq(&undef_lock);
+	list_add(&hook->node, &undef_hook);
+	spin_unlock_irq(&undef_lock);
+}
+
+void unregister_undef_hook(struct undef_hook *hook)
+{
+	spin_lock_irq(&undef_lock);
+	list_del(&hook->node);
+	spin_unlock_irq(&undef_lock);
+}
+
+static int do_cop_absent(u32 insn)
+{
+	int cop_nr;
+	u32 cpucr;
+
+	if ((insn & 0xfdf00000) == 0xf1900000)
+		/* LDC0 */
+		cop_nr = 0;
+	else
+		cop_nr = (insn >> 13) & 0x7;
+
+	/* Try enabling the coprocessor */
+	cpucr = sysreg_read(CPUCR);
+	cpucr |= (1 << (24 + cop_nr));
+	sysreg_write(CPUCR, cpucr);
+
+	cpucr = sysreg_read(CPUCR);
+	if (!(cpucr & (1 << (24 + cop_nr))))
+		return -ENODEV;
+
+	return 0;
+}
+
+#ifdef CONFIG_BUG
+int is_valid_bugaddr(unsigned long pc)
+{
+	unsigned short opcode;
+
+	if (pc < PAGE_OFFSET)
+		return 0;
+	if (probe_kernel_address((u16 *)pc, opcode))
+		return 0;
+
+	return opcode == AVR32_BUG_OPCODE;
+}
+#endif
+
+asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
+{
+	u32 insn;
+	struct undef_hook *hook;
+	void __user *pc;
+	long code;
+
+#ifdef CONFIG_BUG
+	if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) {
+		enum bug_trap_type type;
+
+		type = report_bug(regs->pc, regs);
+		switch (type) {
+		case BUG_TRAP_TYPE_NONE:
+			break;
+		case BUG_TRAP_TYPE_WARN:
+			regs->pc += 2;
+			return;
+		case BUG_TRAP_TYPE_BUG:
+			die("Kernel BUG", regs, SIGKILL);
+		}
+	}
+#endif
+
+	local_irq_enable();
+
+	if (user_mode(regs)) {
+		pc = (void __user *)instruction_pointer(regs);
+		if (get_user(insn, (u32 __user *)pc))
+			goto invalid_area;
+
+		if (ecr == ECR_COPROC_ABSENT && !do_cop_absent(insn))
+			return;
+
+		spin_lock_irq(&undef_lock);
+		list_for_each_entry(hook, &undef_hook, node) {
+			if ((insn & hook->insn_mask) == hook->insn_val) {
+				if (hook->fn(regs, insn) == 0) {
+					spin_unlock_irq(&undef_lock);
+					return;
+				}
+			}
+		}
+		spin_unlock_irq(&undef_lock);
+	}
+
+	switch (ecr) {
+	case ECR_PRIVILEGE_VIOLATION:
+		code = ILL_PRVOPC;
+		break;
+	case ECR_COPROC_ABSENT:
+		code = ILL_COPROC;
+		break;
+	default:
+		code = ILL_ILLOPC;
+		break;
+	}
+
+	_exception(SIGILL, regs, code, regs->pc);
+	return;
+
+invalid_area:
+	_exception(SIGSEGV, regs, SEGV_MAPERR, regs->pc);
+}
+
+asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs)
+{
+	/* We have no FPU yet */
+	_exception(SIGILL, regs, ILL_COPROC, regs->pc);
+}
+
+
+void __init trap_init(void)
+{
+
+}