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| author | Kumar Gala <galak@kernel.crashing.org> | 2008-04-09 16:15:40 -0500 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2008-04-17 01:01:40 -0500 |
| commit | 4eaddb4d7ec380abe95523ba0bdbbe8558f7fef4 (patch) | |
| tree | fa7b3d5f464185b8c05fa4defeff98abee5c8a45 /arch/powerpc/kernel/entry_32.S | |
| parent | 3dd82a1ea72438a545634b3ef90c53313d2caffa (diff) | |
| download | linux-4eaddb4d7ec380abe95523ba0bdbbe8558f7fef4.tar.bz2 | |
[POWERPC] Make Book-E debug handling SMP safe
global_dbcr0 needs to be a per cpu set of save areas instead of a single
global on all processors.
Also, we switch to using DBCR0_IDM to determine if the user space app is
being debugged as its a more consistent way. In the future we should
support features like hardware breakpoint and watchpoints which will
have DBCR0_IDM set but not necessarily DBCR0_IC (single step).
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 69a91bd46115..84c868633068 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -110,9 +110,9 @@ transfer_to_handler: stw r11,PT_REGS(r12) #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) /* Check to see if the dbcr0 register is set up to debug. Use the - single-step bit to do this. */ + internal debug mode bit to do this. */ lwz r12,THREAD_DBCR0(r12) - andis. r12,r12,DBCR0_IC@h + andis. r12,r12,DBCR0_IDM@h beq+ 3f /* From user and task is ptraced - load up global dbcr0 */ li r12,-1 /* clear all pending debug events */ @@ -120,6 +120,12 @@ transfer_to_handler: lis r11,global_dbcr0@ha tophys(r11,r11) addi r11,r11,global_dbcr0@l +#ifdef CONFIG_SMP + rlwinm r9,r1,0,0,(31-THREAD_SHIFT) + lwz r9,TI_CPU(r9) + slwi r9,r9,3 + add r11,r11,r9 +#endif lwz r12,0(r11) mtspr SPRN_DBCR0,r12 lwz r12,4(r11) @@ -238,10 +244,10 @@ ret_from_syscall: stw r11,_CCR(r1) syscall_exit_cont: #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) - /* If the process has its own DBCR0 value, load it up. The single - step bit tells us that dbcr0 should be loaded. */ + /* If the process has its own DBCR0 value, load it up. The internal + debug mode bit tells us that dbcr0 should be loaded. */ lwz r0,THREAD+THREAD_DBCR0(r2) - andis. r10,r0,DBCR0_IC@h + andis. r10,r0,DBCR0_IDM@h bnel- load_dbcr0 #endif #ifdef CONFIG_44x @@ -666,10 +672,10 @@ user_exc_return: /* r10 contains MSR_KERNEL here */ restore_user: #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) - /* Check whether this process has its own DBCR0 value. The single - step bit tells us that dbcr0 should be loaded. */ + /* Check whether this process has its own DBCR0 value. The internal + debug mode bit tells us that dbcr0 should be loaded. */ lwz r0,THREAD+THREAD_DBCR0(r2) - andis. r10,r0,DBCR0_IC@h + andis. r10,r0,DBCR0_IDM@h bnel- load_dbcr0 #endif @@ -879,6 +885,12 @@ load_dbcr0: mfspr r10,SPRN_DBCR0 lis r11,global_dbcr0@ha addi r11,r11,global_dbcr0@l +#ifdef CONFIG_SMP + rlwinm r9,r1,0,0,(31-THREAD_SHIFT) + lwz r9,TI_CPU(r9) + slwi r9,r9,3 + add r11,r11,r9 +#endif stw r10,0(r11) mtspr SPRN_DBCR0,r0 lwz r10,4(r11) @@ -891,7 +903,7 @@ load_dbcr0: .section .bss .align 4 global_dbcr0: - .space 8 + .space 8*NR_CPUS .previous #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */ |