1 files changed, 127 insertions, 294 deletions

diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index adc01a12d15..4f0382d8483 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -5,158 +5,25 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-#undef DEBUG
-#include <linux/sched.h>
+
+#include <linux/bug.h>
 #include <linux/init.h>
-#include <linux/module.h>
 #include <linux/kallsyms.h>
+#include <linux/module.h>
 #include <linux/notifier.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
 
-#include <asm/traps.h>
-#include <asm/sysreg.h>
 #include <asm/addrspace.h>
-#include <asm/ocd.h>
 #include <asm/mmu_context.h>
-#include <asm/uaccess.h>
-
-static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
-{
-	unsigned long p;
-	int i;
-
-	printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
-
-	for (p = bottom & ~31; p < top; ) {
-		printk("%04lx: ", p & 0xffff);
-
-		for (i = 0; i < 8; i++, p += 4) {
-			unsigned int val;
-
-			if (p < bottom || p >= top)
-				printk("         ");
-			else {
-				if (__get_user(val, (unsigned int __user *)p)) {
-					printk("\n");
-					goto out;
-				}
-				printk("%08x ", val);
-			}
-		}
-		printk("\n");
-	}
-
-out:
-	return;
-}
-
-static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p)
-{
-	return (p > (unsigned long)tinfo)
-		&& (p < (unsigned long)tinfo + THREAD_SIZE - 3);
-}
-
-#ifdef CONFIG_FRAME_POINTER
-static inline void __show_trace(struct task_struct *tsk, unsigned long *sp,
-				struct pt_regs *regs)
-{
-	unsigned long lr, fp;
-	struct thread_info *tinfo;
-
-	tinfo = (struct thread_info *)
-		((unsigned long)sp & ~(THREAD_SIZE - 1));
-
-	if (regs)
-		fp = regs->r7;
-	else if (tsk == current)
-		asm("mov %0, r7" : "=r"(fp));
-	else
-		fp = tsk->thread.cpu_context.r7;
-
-	/*
-	 * Walk the stack as long as the frame pointer (a) is within
-	 * the kernel stack of the task, and (b) it doesn't move
-	 * downwards.
-	 */
-	while (valid_stack_ptr(tinfo, fp)) {
-		unsigned long new_fp;
-
-		lr = *(unsigned long *)fp;
-		printk(" [<%08lx>] ", lr);
-		print_symbol("%s\n", lr);
-
-		new_fp = *(unsigned long *)(fp + 4);
-		if (new_fp <= fp)
-			break;
-		fp = new_fp;
-	}
-	printk("\n");
-}
-#else
-static inline void __show_trace(struct task_struct *tsk, unsigned long *sp,
-				struct pt_regs *regs)
-{
-	unsigned long addr;
-
-	while (!kstack_end(sp)) {
-		addr = *sp++;
-		if (kernel_text_address(addr)) {
-			printk(" [<%08lx>] ", addr);
-			print_symbol("%s\n", addr);
-		}
-	}
-}
-#endif
-
-void show_trace(struct task_struct *tsk, unsigned long *sp,
-		       struct pt_regs *regs)
-{
-	if (regs &&
-	    (((regs->sr & MODE_MASK) == MODE_EXCEPTION) ||
-	     ((regs->sr & MODE_MASK) == MODE_USER)))
-		return;
-
-	printk ("Call trace:");
-#ifdef CONFIG_KALLSYMS
-	printk("\n");
-#endif
-
-	__show_trace(tsk, sp, regs);
-	printk("\n");
-}
-
-void show_stack(struct task_struct *tsk, unsigned long *sp)
-{
-	unsigned long stack;
-
-	if (!tsk)
-		tsk = current;
-	if (sp == 0) {
-		if (tsk == current) {
-			register unsigned long *real_sp __asm__("sp");
-			sp = real_sp;
-		} else {
-			sp = (unsigned long *)tsk->thread.cpu_context.ksp;
-		}
-	}
-
-	stack = (unsigned long)sp;
-	dump_mem("Stack: ", stack,
-		 THREAD_SIZE + (unsigned long)tsk->thread_info);
-	show_trace(tsk, sp, NULL);
-}
-
-void dump_stack(void)
-{
-	show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
+#include <asm/ocd.h>
+#include <asm/sysreg.h>
+#include <asm/traps.h>
 
 ATOMIC_NOTIFIER_HEAD(avr32_die_chain);
 
 int register_die_notifier(struct notifier_block *nb)
 {
-	pr_debug("register_die_notifier: %p\n", nb);
-
 	return atomic_notifier_chain_register(&avr32_die_chain, nb);
 }
 EXPORT_SYMBOL(register_die_notifier);
@@ -169,93 +36,103 @@ EXPORT_SYMBOL(unregister_die_notifier);
 
 static DEFINE_SPINLOCK(die_lock);
 
-void __die(const char *str, struct pt_regs *regs, unsigned long err,
-	   const char *file, const char *func, unsigned long line)
+void NORET_TYPE die(const char *str, struct pt_regs *regs, long err)
 {
-	struct task_struct *tsk = current;
 	static int die_counter;
 
 	console_verbose();
 	spin_lock_irq(&die_lock);
 	bust_spinlocks(1);
 
-	printk(KERN_ALERT "%s", str);
-	if (file && func)
-		printk(" in %s:%s, line %ld", file, func, line);
-	printk("[#%d]:\n", ++die_counter);
-	print_modules();
-	show_regs(regs);
-	printk("Process %s (pid: %d, stack limit = 0x%p)\n",
-	       tsk->comm, tsk->pid, tsk->thread_info + 1);
-
-	if (!user_mode(regs) || in_interrupt()) {
-		dump_mem("Stack: ", regs->sp,
-			 THREAD_SIZE + (unsigned long)tsk->thread_info);
+	printk(KERN_ALERT "Oops: %s, sig: %ld [#%d]\n" KERN_EMERG,
+	       str, err, ++die_counter);
+#ifdef CONFIG_PREEMPT
+	printk("PREEMPT ");
+#endif
+#ifdef CONFIG_FRAME_POINTER
+	printk("FRAME_POINTER ");
+#endif
+	if (current_cpu_data.features & AVR32_FEATURE_OCD) {
+		unsigned long did = __mfdr(DBGREG_DID);
+		printk("chip: 0x%03lx:0x%04lx rev %lu\n",
+		       (did >> 1) & 0x7ff,
+		       (did >> 12) & 0x7fff,
+		       (did >> 28) & 0xf);
+	} else {
+		printk("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);
 	spin_unlock_irq(&die_lock);
-	do_exit(SIGSEGV);
+
+	if (in_interrupt())
+		panic("Fatal exception in interrupt");
+
+	if (panic_on_oops)
+		panic("Fatal exception");
+
+	do_exit(err);
 }
 
-void __die_if_kernel(const char *str, struct pt_regs *regs, unsigned long err,
-		     const char *file, const char *func, unsigned long line)
+void _exception(long signr, struct pt_regs *regs, int code,
+		unsigned long addr)
 {
+	siginfo_t info;
+
 	if (!user_mode(regs))
-		__die(str, regs, err, file, func, line);
-}
+		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)
-{
-#ifdef CONFIG_SUBARCH_AVR32B
 	/*
-	 * The exception entry always saves RSR_EX. For NMI, this is
-	 * wrong; it should be RSR_NMI
+	 * Init gets no signals that it doesn't have a handler for.
+	 * That's all very well, but if it has caused a synchronous
+	 * exception and we ignore the resulting signal, it will just
+	 * generate the same exception over and over again and we get
+	 * nowhere.  Better to kill it and let the kernel panic.
 	 */
-	regs->sr = sysreg_read(RSR_NMI);
-#endif
+	if (is_init(current)) {
+		__sighandler_t handler;
+
+		spin_lock_irq(&current->sighand->siglock);
+		handler = current->sighand->action[signr-1].sa.sa_handler;
+		spin_unlock_irq(&current->sighand->siglock);
+		if (handler == SIG_DFL) {
+			/* init has generated a synchronous exception
+			   and it doesn't have a handler for the signal */
+			printk(KERN_CRIT "init has generated signal %ld "
+			       "but has no handler for it\n", signr);
+			do_exit(signr);
+		}
+	}
+}
 
-	printk("NMI taken!!!!\n");
-	die("NMI", regs, ecr);
-	BUG();
+asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
+{
+	printk(KERN_ALERT "Got Non-Maskable Interrupt, dumping regs\n");
+	show_regs_log_lvl(regs, KERN_ALERT);
+	show_stack_log_lvl(current, regs->sp, regs, KERN_ALERT);
 }
 
 asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
 {
-	printk("Unable to handle critical exception %lu at pc = %08lx!\n",
-	       ecr, regs->pc);
-	die("Oops", regs, ecr);
-	BUG();
+	die("Critical exception", regs, SIGKILL);
 }
 
 asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs)
 {
-	siginfo_t info;
-
-	die_if_kernel("Oops: Address exception in kernel mode", regs, ecr);
-
-#ifdef DEBUG
-	if (ecr == ECR_ADDR_ALIGN_X)
-		pr_debug("Instruction Address Exception at pc = %08lx\n",
-			 regs->pc);
-	else if (ecr == ECR_ADDR_ALIGN_R)
-		pr_debug("Data Address Exception (Read) at pc = %08lx\n",
-			 regs->pc);
-	else if (ecr == ECR_ADDR_ALIGN_W)
-		pr_debug("Data Address Exception (Write) at pc = %08lx\n",
-			 regs->pc);
-	else
-		BUG();
-
-	show_regs(regs);
-#endif
-
-	info.si_signo = SIGBUS;
-	info.si_errno = 0;
-	info.si_code = BUS_ADRALN;
-	info.si_addr = (void __user *)regs->pc;
-
-	force_sig_info(SIGBUS, &info, current);
+	_exception(SIGBUS, regs, BUS_ADRALN, regs->pc);
 }
 
 /* This way of handling undefined instructions is stolen from ARM */
@@ -280,7 +157,8 @@ static int do_cop_absent(u32 insn)
 {
 	int cop_nr;
 	u32 cpucr;
-	if ( (insn & 0xfdf00000) == 0xf1900000 )
+
+	if ((insn & 0xfdf00000) == 0xf1900000)
 		/* LDC0 */
 		cop_nr = 0;
 	else
@@ -292,136 +170,91 @@ static int do_cop_absent(u32 insn)
 	sysreg_write(CPUCR, cpucr);
 
 	cpucr = sysreg_read(CPUCR);
-	if ( !(cpucr & (1 << (24 + cop_nr))) ){
-		printk("Coprocessor #%i not found!\n", cop_nr);
-		return -1;
-	}
+	if (!(cpucr & (1 << (24 + cop_nr))))
+		return -ENODEV;
 
 	return 0;
 }
 
-#ifdef CONFIG_BUG
-#ifdef CONFIG_DEBUG_BUGVERBOSE
-static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
-{
-	char *file;
-	u16 line;
-	char c;
-
-	if (__get_user(line, (u16 __user *)(regs->pc + 2)))
-		return;
-	if (__get_user(file, (char * __user *)(regs->pc + 4))
-	    || (unsigned long)file < PAGE_OFFSET
-	    || __get_user(c, file))
-		file = "<bad filename>";
-
-	printk(KERN_ALERT "kernel BUG at %s:%d!\n", file, line);
-}
-#else
-static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
+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
-#endif
 
 asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
 {
 	u32 insn;
 	struct undef_hook *hook;
-	siginfo_t info;
 	void __user *pc;
+	long code;
 
-	if (!user_mode(regs))
-		goto kernel_trap;
+	if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) {
+		enum bug_trap_type type;
+
+		type = report_bug(regs->pc);
+		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);
+		}
+	}
 
 	local_irq_enable();
 
-	pc = (void __user *)instruction_pointer(regs);
-	if (__get_user(insn, (u32 __user *)pc))
-		goto invalid_area;
+	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) {
-		if (do_cop_absent(insn) == 0)
+		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_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);
 	}
-	spin_unlock_irq(&undef_lock);
-
-invalid_area:
 
-#ifdef DEBUG
-	printk("Illegal instruction at pc = %08lx\n", regs->pc);
-	if (regs->pc < TASK_SIZE) {
-		unsigned long ptbr, pgd, pte, *p;
-
-		ptbr = sysreg_read(PTBR);
-		p = (unsigned long *)ptbr;
-		pgd = p[regs->pc >> 22];
-		p = (unsigned long *)((pgd & 0x1ffff000) | 0x80000000);
-		pte = p[(regs->pc >> 12) & 0x3ff];
-		printk("page table: 0x%08lx -> 0x%08lx -> 0x%08lx\n", ptbr, pgd, pte);
-	}
-#endif
-
-	info.si_signo = SIGILL;
-	info.si_errno = 0;
-	info.si_addr = (void __user *)regs->pc;
 	switch (ecr) {
-	case ECR_ILLEGAL_OPCODE:
-	case ECR_UNIMPL_INSTRUCTION:
-		info.si_code = ILL_ILLOPC;
-		break;
 	case ECR_PRIVILEGE_VIOLATION:
-		info.si_code = ILL_PRVOPC;
+		code = ILL_PRVOPC;
 		break;
 	case ECR_COPROC_ABSENT:
-		info.si_code = ILL_COPROC;
+		code = ILL_COPROC;
 		break;
 	default:
-		BUG();
+		code = ILL_ILLOPC;
+		break;
 	}
 
-	force_sig_info(SIGILL, &info, current);
+	_exception(SIGILL, regs, code, regs->pc);
 	return;
 
-kernel_trap:
-#ifdef CONFIG_BUG
-	if (__kernel_text_address(instruction_pointer(regs))) {
-		insn = *(u16 *)instruction_pointer(regs);
-		if (insn == AVR32_BUG_OPCODE) {
-			do_bug_verbose(regs, insn);
-			die("Kernel BUG", regs, 0);
-			return;
-		}
-	}
-#endif
-
-	die("Oops: Illegal instruction in kernel code", regs, ecr);
+invalid_area:
+	_exception(SIGSEGV, regs, SEGV_MAPERR, regs->pc);
 }
 
 asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs)
 {
-	siginfo_t info;
-
-	printk("Floating-point exception at pc = %08lx\n", regs->pc);
-
-	/* We have no FPU... */
-	info.si_signo = SIGILL;
-	info.si_errno = 0;
-	info.si_addr = (void __user *)regs->pc;
-	info.si_code = ILL_COPROC;
-
-	force_sig_info(SIGILL, &info, current);
+	/* We have no FPU yet */
+	_exception(SIGILL, regs, ILL_COPROC, regs->pc);
 }