path: root/arch/powerpc/kernel
diff options
authorPaul Mackerras <paulus@samba.org>2011-05-01 19:46:44 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-05-04 15:19:27 +1000
commit1977b502120d44b9b4897703adfb2e2fab346880 (patch)
treedfe0e5cc29b409e7638b5e33528b7c4bc003f5e7 /arch/powerpc/kernel
parent851d2e2fe8dbcbe3afcad6fc4569c881d8ad4ce9 (diff)
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>
Diffstat (limited to 'arch/powerpc/kernel')
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 226cc8c6222..27ca8b7c600 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -461,9 +461,20 @@ bad_stack:
std r12,_XER(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)
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)
bl .kernel_bad_stack
b 1b