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[3/5] PPC64-HWBKPT: Handle concurrent alignment interrupts

Message ID 20100528064017.GD8679@in.ibm.com (mailing list archive)
State Accepted, archived
Commit 2538c2d08f46141550a1e68819efa8fe31c6e3dc
Headers show

Commit Message

K.Prasad May 28, 2010, 6:40 a.m. UTC 
An alignment interrupt may intervene between a DSI/hw-breakpoint exception
and the single-step exception. Enable the alignment interrupt (through
modifications to emulate_single_step()) to notify the single-step exception
handler for proper restoration of hw-breakpoints.

Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/traps.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)
diff mbox

Patch

Index: linux-2.6.ppc64_test/arch/powerpc/kernel/traps.c
===================================================================
--- linux-2.6.ppc64_test.orig/arch/powerpc/kernel/traps.c
+++ linux-2.6.ppc64_test/arch/powerpc/kernel/traps.c
@@ -602,7 +602,7 @@  void RunModeException(struct pt_regs *re
 
 void __kprobes single_step_exception(struct pt_regs *regs)
 {
-	regs->msr &= ~(MSR_SE | MSR_BE);  /* Turn off 'trace' bits */
+	clear_single_step(regs);
 
 	if (notify_die(DIE_SSTEP, "single_step", regs, 5,
 					5, SIGTRAP) == NOTIFY_STOP)
@@ -621,10 +621,8 @@  void __kprobes single_step_exception(str
  */
 static void emulate_single_step(struct pt_regs *regs)
 {
-	if (single_stepping(regs)) {
-		clear_single_step(regs);
-		_exception(SIGTRAP, regs, TRAP_TRACE, 0);
-	}
+	if (single_stepping(regs))
+		single_step_exception(regs);
 }
 
 static inline int __parse_fpscr(unsigned long fpscr)