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[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>
This commit is contained in:
Kumar Gala 2008-04-09 16:15:40 -05:00
parent 3dd82a1ea7
commit 4eaddb4d7e
1 changed files with 21 additions and 9 deletions
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30
arch/powerpc/kernel/entry_32.S
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@ -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) */