powerpc: Save register r9-r13 values accurately on interrupt with bad stack

When we take an interrupt or exception from kernel mode and the stack
pointer is obviously not a kernel address (i.e. the top bit is 0), we
switch to an emergency stack, save register values and panic.  However,
on 64-bit server machines, we don't actually save the values of r9 - r13
at the time of the interrupt, but rather values corrupted by the
exception entry code for r12-r13, and nothing at all for r9-r11.

This fixes it by passing a pointer to the register save area in the paca
through to the bad_stack code in r3.  The register values are saved in
one of the paca register save areas (depending on which exception this
is).  Using the pointer in r3, the bad_stack code now retrieves the
saved values of r9 - r13 and stores them in the exception frame on the
emergency stack.  This also stores the normal exception frame marker
("regshere") in the exception frame.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/exception-64s.h

@@ -104,10 +104,11 @@
 	beq-	1f;							   \
 	ld	r1,PACAKSAVE(r13);	/* kernel stack to use		*/ \
 1:	cmpdi	cr1,r1,0;		/* check if r1 is in userspace	*/ \
-	bge-	cr1,2f;			/* abort if it is		*/ \
-	b	3f;							   \
-2:	li	r1,(n);			/* will be reloaded later	*/ \
+	blt+	cr1,3f;			/* abort if it is		*/ \
+	li	r1,(n);			/* will be reloaded later	*/ \
 	sth	r1,PACA_TRAP_SAVE(r13);					   \
+	std	r3,area+EX_R3(r13);					   \
+	addi	r3,r13,area;		/* r3 -> where regs are saved*/	   \
 	b	bad_stack;						   \
 3:	std	r9,_CCR(r1);		/* save CR in stackframe	*/ \
 	std	r11,_NIP(r1);		/* save SRR0 in stackframe	*/ \

arch/powerpc/kernel/exceptions-64s.S

@@ -461,9 +461,20 @@ bad_stack:
 	std	r12,_XER(r1)
 	SAVE_GPR(0,r1)
 	SAVE_GPR(2,r1)
-	SAVE_4GPRS(3,r1)
-	SAVE_2GPRS(7,r1)
-	SAVE_10GPRS(12,r1)
+	ld	r10,EX_R3(r3)
+	std	r10,GPR3(r1)
+	SAVE_GPR(4,r1)
+	SAVE_4GPRS(5,r1)
+	ld	r9,EX_R9(r3)
+	ld	r10,EX_R10(r3)
+	SAVE_2GPRS(9,r1)
+	ld	r9,EX_R11(r3)
+	ld	r10,EX_R12(r3)
+	ld	r11,EX_R13(r3)
+	std	r9,GPR11(r1)
+	std	r10,GPR12(r1)
+	std	r11,GPR13(r1)
+	SAVE_8GPRS(14,r1)
 	SAVE_10GPRS(22,r1)
 	lhz	r12,PACA_TRAP_SAVE(r13)
 	std	r12,_TRAP(r1)
@@ -472,6 +483,9 @@ bad_stack:
 	li	r12,0
 	std	r12,0(r11)
 	ld	r2,PACATOC(r13)
+	ld	r11,exception_marker@toc(r2)
+	std	r12,RESULT(r1)
+	std	r11,STACK_FRAME_OVERHEAD-16(r1)
 1:	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	.kernel_bad_stack
 	b	1b