[AVR32] Clean up exception handling code (623b0355) · Commits · 戴 / test

arch/avr32/Kconfig

+5 −0

Original line number	Diff line number	Diff line
		@@ -68,6 +68,11 @@ config GENERIC_CALIBRATE_DELAY
		bool
		default y

		config GENERIC_BUG
		bool
		default y
		depends on BUG

		source "init/Kconfig"

		menu "System Type and features"

arch/avr32/kernel/module.c

+6 −5

Original line number	Diff line number	Diff line
		@@ -12,10 +12,11 @@
		* published by the Free Software Foundation.
		*/

		#include <linux/moduleloader.h>
		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/bug.h>
		#include <linux/elf.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/moduleloader.h>
		#include <linux/vmalloc.h>

		void *module_alloc(unsigned long size)
		@@ -315,10 +316,10 @@ int module_finalize(const Elf_Ehdr hdr, const Elf_Shdr sechdrs,
		vfree(module->arch.syminfo);
		module->arch.syminfo = NULL;

		return 0;
		return module_bug_finalize(hdr, sechdrs, module);
		}

		void module_arch_cleanup(struct module *module)
		{

		module_bug_cleanup(module);
		}

arch/avr32/kernel/process.c

+170 −18

Original line number	Diff line number	Diff line
		@@ -11,6 +11,7 @@
		#include <linux/fs.h>
		#include <linux/ptrace.h>
		#include <linux/reboot.h>
		#include <linux/uaccess.h>
		#include <linux/unistd.h>

		#include <asm/sysreg.h>
		@@ -115,39 +116,178 @@ void release_thread(struct task_struct *dead_task)
		/* do nothing */
		}

		static void dump_mem(const char str, const char log_lvl,
		unsigned long bottom, unsigned long top)
		{
		unsigned long p;
		int i;

		printk("%s%s(0x%08lx to 0x%08lx)\n", log_lvl, str, bottom, top);

		for (p = bottom & ~31; p < top; ) {
		printk("%s%04lx: ", log_lvl, 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 void show_trace_log_lvl(struct task_struct tsk, unsigned long sp,
		struct pt_regs regs, const char log_lvl)
		{
		unsigned long lr, fp;
		struct thread_info *tinfo;

		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.
		*/
		tinfo = task_thread_info(tsk);
		printk("%sCall trace:\n", log_lvl);
		while (valid_stack_ptr(tinfo, fp)) {
		unsigned long new_fp;

		lr = (unsigned long )fp;
		#ifdef CONFIG_KALLSYMS
		printk("%s [<%08lx>] ", log_lvl, lr);
		#else
		printk(" [<%08lx>] ", lr);
		#endif
		print_symbol("%s\n", lr);

		new_fp = (unsigned long )(fp + 4);
		if (new_fp <= fp)
		break;
		fp = new_fp;
		}
		printk("\n");
		}
		#else
		static void show_trace_log_lvl(struct task_struct tsk, unsigned long sp,
		struct pt_regs regs, const char log_lvl)
		{
		unsigned long addr;

		printk("%sCall trace:\n", log_lvl);

		while (!kstack_end(sp)) {
		addr = *sp++;
		if (kernel_text_address(addr)) {
		#ifdef CONFIG_KALLSYMS
		printk("%s [<%08lx>] ", log_lvl, addr);
		#else
		printk(" [<%08lx>] ", addr);
		#endif
		print_symbol("%s\n", addr);
		}
		}
		printk("\n");
		}
		#endif

		void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
		struct pt_regs regs, const char log_lvl)
		{
		struct thread_info *tinfo;

		if (sp == 0) {
		if (tsk)
		sp = tsk->thread.cpu_context.ksp;
		else
		sp = (unsigned long)&tinfo;
		}
		if (!tsk)
		tsk = current;

		tinfo = task_thread_info(tsk);

		if (valid_stack_ptr(tinfo, sp)) {
		dump_mem("Stack: ", log_lvl, sp,
		THREAD_SIZE + (unsigned long)tinfo);
		show_trace_log_lvl(tsk, (unsigned long *)sp, regs, log_lvl);
		}
		}

		void show_stack(struct task_struct tsk, unsigned long stack)
		{
		show_stack_log_lvl(tsk, (unsigned long)stack, NULL, "");
		}

		void dump_stack(void)
		{
		unsigned long stack;

		show_trace_log_lvl(current, &stack, NULL, "");
		}
		EXPORT_SYMBOL(dump_stack);

		static const char *cpu_modes[] = {
		"Application", "Supervisor", "Interrupt level 0", "Interrupt level 1",
		"Interrupt level 2", "Interrupt level 3", "Exception", "NMI"
		};

		void show_regs(struct pt_regs *regs)
		void show_regs_log_lvl(struct pt_regs regs, const char log_lvl)
		{
		unsigned long sp = regs->sp;
		unsigned long lr = regs->lr;
		unsigned long mode = (regs->sr & MODE_MASK) >> MODE_SHIFT;

		if (!user_mode(regs))
		if (!user_mode(regs)) {
		sp = (unsigned long)regs + FRAME_SIZE_FULL;

		printk("%s", log_lvl);
		print_symbol("PC is at %s\n", instruction_pointer(regs));
		printk("%s", log_lvl);
		print_symbol("LR is at %s\n", lr);
		printk("pc : [<%08lx>] lr : [<%08lx>] %s\n"
		"sp : %08lx r12: %08lx r11: %08lx\n",
		instruction_pointer(regs),
		lr, print_tainted(), sp, regs->r12, regs->r11);
		printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
		regs->r10, regs->r9, regs->r8);
		printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
		regs->r7, regs->r6, regs->r5, regs->r4);
		printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
		regs->r3, regs->r2, regs->r1, regs->r0);
		printk("Flags: %c%c%c%c%c\n",
		}

		printk("%spc : [<%08lx>] lr : [<%08lx>] %s\n"
		"%ssp : %08lx r12: %08lx r11: %08lx\n",
		log_lvl, instruction_pointer(regs), lr, print_tainted(),
		log_lvl, sp, regs->r12, regs->r11);
		printk("%sr10: %08lx r9 : %08lx r8 : %08lx\n",
		log_lvl, regs->r10, regs->r9, regs->r8);
		printk("%sr7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
		log_lvl, regs->r7, regs->r6, regs->r5, regs->r4);
		printk("%sr3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
		log_lvl, regs->r3, regs->r2, regs->r1, regs->r0);
		printk("%sFlags: %c%c%c%c%c\n", log_lvl,
		regs->sr & SR_Q ? 'Q' : 'q',
		regs->sr & SR_V ? 'V' : 'v',
		regs->sr & SR_N ? 'N' : 'n',
		regs->sr & SR_Z ? 'Z' : 'z',
		regs->sr & SR_C ? 'C' : 'c');
		printk("Mode bits: %c%c%c%c%c%c%c%c%c\n",
		printk("%sMode bits: %c%c%c%c%c%c%c%c%c\n", log_lvl,
		regs->sr & SR_H ? 'H' : 'h',
		regs->sr & SR_R ? 'R' : 'r',
		regs->sr & SR_J ? 'J' : 'j',
		@@ -157,9 +297,21 @@ void show_regs(struct pt_regs *regs)
		regs->sr & SR_I1M ? '1' : '.',
		regs->sr & SR_I0M ? '0' : '.',
		regs->sr & SR_GM ? 'G' : 'g');
		printk("CPU Mode: %s\n", cpu_modes[mode]);
		printk("%sCPU Mode: %s\n", log_lvl, cpu_modes[mode]);
		printk("%sProcess: %s [%d] (task: %p thread: %p)\n",
		log_lvl, current->comm, current->pid, current,
		task_thread_info(current));
		}

		void show_regs(struct pt_regs *regs)
		{
		unsigned long sp = regs->sp;

		if (!user_mode(regs))
		sp = (unsigned long)regs + FRAME_SIZE_FULL;

		show_trace(NULL, (unsigned long *)sp, regs);
		show_regs_log_lvl(regs, "");
		show_trace_log_lvl(current, (unsigned long *)sp, regs, "");
		}
		EXPORT_SYMBOL(show_regs);

arch/avr32/kernel/traps.c

+127 −294

Original line number	Diff line number	Diff line
		@@ -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 */
		@@ -280,6 +157,7 @@ static int do_cop_absent(u32 insn)
		{
		int cop_nr;
		u32 cpucr;

		if ((insn & 0xfdf00000) == 0xf1900000)
		/* LDC0 */
		cop_nr = 0;
		@@ -292,59 +170,55 @@ 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)
		int is_valid_bugaddr(unsigned long pc)
		{
		char *file;
		u16 line;
		char c;
		unsigned short opcode;

		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)
		{
		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();

		if (user_mode(regs)) {
		pc = (void __user *)instruction_pointer(regs);
		if (__get_user(insn, (u32 __user *)pc))
		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) {
		@@ -356,72 +230,31 @@ asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
		}
		}
		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);
		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);
		_exception(SIGILL, regs, code, regs->pc);
		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);
		}

arch/avr32/kernel/vmlinux.lds.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -26,6 +26,12 @@ SECTIONS
		_sinittext = .;
		*(.text.reset)
		*(.init.text)
		/*
		* .exit.text is discarded at runtime, not
		* link time, to deal with references from
		* __bug_table
		*/
		*(.exit.text)
		_einittext = .;
		. = ALIGN(4);
		__tagtable_begin = .;
		@@ -86,6 +92,8 @@ SECTIONS
		__stop___ex_table = .;
		}

		BUG_TABLE

		RODATA

		. = ALIGN(8192);
		@@ -126,7 +134,6 @@ SECTIONS
		* thrown away, as cleanup code is never called unless it's a module.
		*/
		/DISCARD/ : {
		*(.exit.text)
		*(.exit.data)
		*(.exitcall.exit)
		}

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