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powerpc: Fix interrupt range check on debug exception

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We do not want to take single step and branch-taken debug exception
in kernel exception code. But the address range check was not covering
all kernel exception handlers address range.

With this patch we defined the interrupt_end label which defines the
end on kernel exception code. So now we check interrupt_base to
interrupt_end range for not handling debug exception in kernel
exception entry.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Bharat Bhushan 2013-04-29 22:18:11 +00:00 committed by Benjamin Herrenschmidt
parent 1f6aaaccb1
commit fc2a6cfe05
3 changed files with 12 additions and 8 deletions
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2
arch/powerpc/kernel/head_44x.S
View File

@ -769,6 +769,8 @@ finish_tlb_load_47x:
*/
DEBUG_CRIT_EXCEPTION
interrupt_end:
/*
* Global functions
*/

16
arch/powerpc/kernel/head_booke.h
View File

@ -281,13 +281,13 @@ label:
andis. r10,r10,(DBSR_IC|DBSR_BT)@h; \
beq+ 2f; \
\
lis r10,KERNELBASE@h; /* check if exception in vectors */ \
ori r10,r10,KERNELBASE@l; \
lis r10,interrupt_base@h; /* check if exception in vectors */ \
ori r10,r10,interrupt_base@l; \
cmplw r12,r10; \
blt+ 2f; /* addr below exception vectors */ \
\
lis r10,DebugDebug@h; \
ori r10,r10,DebugDebug@l; \
lis r10,interrupt_end@h; \
ori r10,r10,interrupt_end@l; \
cmplw r12,r10; \
bgt+ 2f; /* addr above exception vectors */ \
\
@ -334,13 +334,13 @@ label:
andis. r10,r10,(DBSR_IC|DBSR_BT)@h; \
beq+ 2f; \
\
lis r10,KERNELBASE@h; /* check if exception in vectors */ \
ori r10,r10,KERNELBASE@l; \
lis r10,interrupt_base@h; /* check if exception in vectors */ \
ori r10,r10,interrupt_base@l; \
cmplw r12,r10; \
blt+ 2f; /* addr below exception vectors */ \
\
lis r10,DebugCrit@h; \
ori r10,r10,DebugCrit@l; \
lis r10,interrupt_end@h; \
ori r10,r10,interrupt_end@l; \
cmplw r12,r10; \
bgt+ 2f; /* addr above exception vectors */ \
\

2
arch/powerpc/kernel/head_fsl_booke.S
View File

@ -605,6 +605,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
/* Embedded Hypervisor Privilege */
EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception, EXC_XFER_EE)
interrupt_end:
/*
* Local functions
*/