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

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

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Kyle McMartin 2005-10-21 22:43:15 -04:00
parent 99ac794799
commit f053725b89
2 changed files with 29 additions and 6 deletions
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16
arch/parisc/kernel/unaligned.c
View file

@ -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;
}

19
include/asm-parisc/processor.h
View file

@ -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, }, \