The kernel just send out a SIGTRAP signal when handling ptrace breakpoint in
debug exception, so it sounds safe to have interrupt enabled if it is not
disabled by the parent process.
Signed-off-by: Yang Shi <yang....@linaro.org>
---
arch/arm64/kernel/debug-monitors.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm64/kernel/debug-monitors.c
b/arch/arm64/kernel/debug-monitors.c
index 8aee3ae..90d70e4 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -239,6 +239,9 @@ static int single_step_handler(unsigned long addr, unsigned
int esr,
return 0;
if (user_mode(regs)) {
+ if (interrupts_enabled(regs))
+ local_irq_enable();
+
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_HWBKPT;
@@ -310,6 +313,9 @@ static int brk_handler(unsigned long addr, unsigned int esr,
siginfo_t info;
if (user_mode(regs)) {
+ if (interrupts_enabled(regs))
+ local_irq_enable();
+
info = (siginfo_t) {
.si_signo = SIGTRAP,
.si_errno = 0,
@@ -337,6 +343,10 @@ int aarch32_break_handler(struct pt_regs *regs)
if (!compat_user_mode(regs))
return -EFAULT;
+ /* COMPAT_PSR_I_BIT has the same bit mask with non-compat one */
+ if (interrupts_enabled(regs))
+ local_irq_enable();
+
if (compat_thumb_mode(regs)) {
/* get 16-bit Thumb instruction */
get_user(thumb_instr, (u16 __user *)pc);
--
2.0.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
