- if (regs->msr & MSR_VEC)
- giveup_altivec(current);
- /* XXX quick hack for now: set the non-Java bit in the VSCR */
- current->thread.vscr.u[3] |= 0x10000;
+ int err;
+ siginfo_t info;
+
+ if (!user_mode(regs)) {
+ printk(KERN_EMERG "VMX/Altivec assist exception in kernel mode"
+ " at %lx\n", regs->nip);
+ die("Kernel VMX/Altivec assist exception", regs, SIGILL);
+ }
+
+ flush_altivec_to_thread(current);
+
+ err = emulate_altivec(regs);
+ if (err == 0) {
+ regs->nip += 4; /* skip emulated instruction */
+ emulate_single_step(regs);
+ return;
+ }
+
+ if (err == -EFAULT) {
+ /* got an error reading the instruction */
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ info.si_code = SEGV_MAPERR;
+ info.si_addr = (void __user *) regs->nip;
+ force_sig_info(SIGSEGV, &info, current);
+ } else {
+ /* didn't recognize the instruction */
+ /* XXX quick hack for now: set the non-Java bit in the VSCR */
+ if (printk_ratelimit())
+ printk(KERN_ERR "Unrecognized altivec instruction "
+ "in %s at %lx\n", current->comm, regs->nip);
+ current->thread.vscr.u[3] |= 0x10000;
+ }