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Commit 623b0355 authored by Haavard Skinnemoen's avatar Haavard Skinnemoen
Browse files

[AVR32] Clean up exception handling code 



  * Use generic BUG() handling
  * Remove some useless debug statements
  * Use a common function _exception() to send signals or oops when
    an exception can't be handled. This makes sure init doesn't
    enter an infinite exception loop as well. Borrowed from powerpc.
  * Add some basic exception tracing support to the page fault code.
  * Rework dump_stack(), show_regs() and friends and move everything
    into process.c
  * Print information about configuration options and chip type when
    oopsing

Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
parent 3b328c98

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)

	}