powerpc/tm: Add TM Unavailable Exception (172f7aaa) · Commits · 戴 / test

arch/powerpc/kernel/traps.c

+29 −0

Original line number	Diff line number	Diff line
		@@ -1390,6 +1390,13 @@ void vsx_unavailable_exception(struct pt_regs *regs)
		}

		#ifdef CONFIG_PPC64
		static void tm_unavailable(struct pt_regs *regs)
		{
		pr_emerg("Unrecoverable TM Unavailable Exception "
		"%lx at %lx\n", regs->trap, regs->nip);
		die("Unrecoverable TM Unavailable Exception", regs, SIGABRT);
		}

		void facility_unavailable_exception(struct pt_regs *regs)
		{
		static char *facility_strings[] = {
		@@ -1469,6 +1476,27 @@ void facility_unavailable_exception(struct pt_regs *regs)
		return;
		}

		if (status == FSCR_TM_LG) {
		/*
		* If we're here then the hardware is TM aware because it
		* generated an exception with FSRM_TM set.
		*
		* If cpu_has_feature(CPU_FTR_TM) is false, then either firmware
		* told us not to do TM, or the kernel is not built with TM
		* support.
		*
		* If both of those things are true, then userspace can spam the
		* console by triggering the printk() below just by continually
		* doing tbegin (or any TM instruction). So in that case just
		* send the process a SIGILL immediately.
		*/
		if (!cpu_has_feature(CPU_FTR_TM))
		goto out;

		tm_unavailable(regs);
		return;
		}

		if ((status < ARRAY_SIZE(facility_strings)) &&
		facility_strings[status])
		facility = facility_strings[status];
		@@ -1481,6 +1509,7 @@ void facility_unavailable_exception(struct pt_regs *regs)
		"%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n",
		hv ? "Hypervisor " : "", facility, regs->nip, regs->msr);

		out:
		if (user_mode(regs)) {
		_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
		return;