xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/book3e-64: Fix debug support for userspace

Browse Source 
With the introduction of CONFIG_PPC_ADV_DEBUG_REGS user space debug is
broken on Book-E 64-bit parts that support delayed debug events.  When
switch_booke_debug_regs() sets DBCR0 we'll start getting debug events as
MSR_DE is also set and we aren't able to handle debug events from kernel
space.

We can remove the hack that always enables MSR_DE and loads up DBCR0 and
just utilize switch_booke_debug_regs() to get user space debug working
again.

We still need to handle critical/debug exception stacks & proper
save/restore of state for those exception levles to support debug events
from kernel space like we have on 32-bit.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kumar Gala
2011-10-06 02:53:40 +00:00
committed by Benjamin Herrenschmidt
parent b95bc21914
commit 187b9f2aa7
2 changed files with 1 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/reg_booke.h
View File

@@ -31,7 +31,7 @@
#define MSR_ MSR_ME | MSR_CE
#define MSR_KERNEL MSR_ | MSR_64BIT
#define MSR_USER32 MSR_ | MSR_PR | MSR_EE | MSR_DE
#define MSR_USER32 MSR_ | MSR_PR | MSR_EE
#define MSR_USER64 MSR_USER32 | MSR_64BIT
#elif defined (CONFIG_40x)
#define MSR_KERNEL (MSR_ME|MSR_RI|MSR_IR|MSR_DR|MSR_CE)