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Commit f053725b authored by Kyle McMartin's avatar Kyle McMartin
Browse files

[PARISC] Add ability for prctl to change unaligned trap behaviour 



Add support for changing unaligned trap behaviour on a
per-thread basis.

Signed-off-by: default avatarKyle McMartin <kyle@parisc-linux.org>
parent 99ac7947

arch/parisc/kernel/unaligned.c

+10 −6
Original line number Diff line number Diff line
@@ -513,15 +513,18 @@ void handle_unaligned(struct pt_regs *regs) 
	register int flop=0;	/* true if this is a flop */



	/* log a message with pacing */

	if (user_mode(regs))

	{

		if (unaligned_count > 5 && jiffies - last_time > 5*HZ)

		{

	if (user_mode(regs)) {

		if (current->thread.flags & PARISC_UAC_SIGBUS) {

			goto force_sigbus;

		}



		if (unaligned_count > 5 && jiffies - last_time > 5*HZ) {

			unaligned_count = 0;

			last_time = jiffies;

		}

		if (++unaligned_count < 5)

		{



		if (!(current->thread.flags & PARISC_UAC_NOPRINT) 

		    && ++unaligned_count < 5) {

			char buf[256];

			sprintf(buf, "%s(%d): unaligned access to 0x" RFMT " at ip=0x" RFMT "\n",

				current->comm, current->pid, regs->ior, regs->iaoq[0]);
@@ -530,6 +533,7 @@ void handle_unaligned(struct pt_regs *regs) 
			show_regs(regs);

#endif		

		}



		if (!unaligned_enabled)

			goto force_sigbus;

	}

include/asm-parisc/processor.h

+19 −0
Original line number Diff line number Diff line
@@ -122,8 +122,27 @@ struct thread_struct { 
}; 



/* Thread struct flags. */

#define PARISC_UAC_NOPRINT	(1UL << 0)	/* see prctl and unaligned.c */

#define PARISC_UAC_SIGBUS	(1UL << 1)

#define PARISC_KERNEL_DEATH	(1UL << 31)	/* see die_if_kernel()... */



#define PARISC_UAC_SHIFT	0

#define PARISC_UAC_MASK		(PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)



#define SET_UNALIGN_CTL(task,value)                                       \

        ({                                                                \

        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \

                                | (((value) << PARISC_UAC_SHIFT) &        \

                                   PARISC_UAC_MASK));                     \

        0;                                                                \

        })



#define GET_UNALIGN_CTL(task,addr)                                        \

        ({                                                                \

        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \

                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \

        })



#define INIT_THREAD { \

	regs:	{	gr: { 0, }, \

			fr: { 0, }, \