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-rw-r--r--arch/avr32/kernel/traps.c261
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 00000000000..3d760c06f02
--- /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);
+ 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)
+{
+
+}