[PATCH] ppc64: Add ptrace data breakpoint support
Add hardware data breakpoint support.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/ppc64/mm/fault.c b/arch/ppc64/mm/fault.c
index 772f071..7fbc68b 100644
--- a/arch/ppc64/mm/fault.c
+++ b/arch/ppc64/mm/fault.c
@@ -77,6 +77,28 @@
return 0;
}
+static void do_dabr(struct pt_regs *regs, unsigned long error_code)
+{
+ siginfo_t info;
+
+ if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
+ 11, SIGSEGV) == NOTIFY_STOP)
+ return;
+
+ if (debugger_dabr_match(regs))
+ return;
+
+ /* Clear the DABR */
+ set_dabr(0);
+
+ /* Deliver the signal to userspace */
+ info.si_signo = SIGTRAP;
+ info.si_errno = 0;
+ info.si_code = TRAP_HWBKPT;
+ info.si_addr = (void __user *)regs->nip;
+ force_sig_info(SIGTRAP, &info, current);
+}
+
/*
* The error_code parameter is
* - DSISR for a non-SLB data access fault,
@@ -111,12 +133,9 @@
if (!user_mode(regs) && (address >= TASK_SIZE))
return SIGSEGV;
- if (error_code & DSISR_DABRMATCH) {
- if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
- 11, SIGSEGV) == NOTIFY_STOP)
- return 0;
- if (debugger_dabr_match(regs))
- return 0;
+ if (error_code & DSISR_DABRMATCH) {
+ do_dabr(regs, error_code);
+ return 0;
}
if (in_atomic() || mm == NULL) {