microblaze: Save and restore msr in hw exception (ac854ff1) · Commits · 戴 / test

I thought that this part of code could be removed because just save and restore MSR but any code can't change it. But seems to that any part of code works with this information. This patch solved problem with allocation. Signed-off-by:

Michal Simek <monstr@monstr.eu>

arch/microblaze/kernel/hw_exception_handler.S

+6 −2

Original line number	Diff line number	Diff line
		@@ -84,9 +84,10 @@
		#define NUM_TO_REG(num) r ## num

		#ifdef CONFIG_MMU
		/* FIXME you can't change first load of MSR because there is
		* hardcoded jump bri 4 */
		#define RESTORE_STATE \
		lwi r5, r1, 0; \
		mts rmsr, r5; \
		nop; \
		lwi r3, r1, PT_R3; \
		lwi r4, r1, PT_R4; \
		lwi r5, r1, PT_R5; \
		@@ -309,6 +310,9 @@ _hw_exception_handler:
		lwi r31, r0, TOPHYS(PER_CPU(CURRENT_SAVE)) /* get saved current */
		#endif

		mfs r5, rmsr;
		nop
		swi r5, r1, 0;
		mfs r3, resr
		nop
		mfs r4, rear;

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