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powerpc: Fix booke user_disable_single_step() 

On booke processors, gdb is seeing spurious SIGTRAPs when setting a
watchpoint.

user_disable_single_step() simply quits when the DAC is non-zero.  It should
be clearing the DBCR0_IC and DBCR0_BT bits from the dbcr0 register and
TIF_SINGLESTEP from the thread flag.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Dave Kleikamp 2009-07-08 13:46:18 +00:00 committed by Benjamin Herrenschmidt
parent e9e961c9a8
commit 28477fb1ed
1 changed files with 9 additions and 8 deletions
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17
arch/powerpc/kernel/ptrace.c
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@ -736,15 +736,16 @@ void user_disable_single_step(struct task_struct *task)
{
struct pt_regs *regs = task->thread.regs;
#if defined(CONFIG_BOOKE)
/* If DAC then do not single step, skip */
if (task->thread.dabr)
return;
#endif
if (regs != NULL) {
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
#if defined(CONFIG_BOOKE)
/* If DAC don't clear DBCRO_IDM or MSR_DE */
if (task->thread.dabr)
task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT);
else {
task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT | DBCR0_IDM);
regs->msr &= ~MSR_DE;
}
#elif defined(CONFIG_40x)
task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT | DBCR0_IDM);
regs->msr &= ~MSR_DE;
#else