This I-pipe hook reports the desired resumption mode to the subscriber:
resume all process tasks or just single-step a particular one? The use
case is to enable synchronous stopping / resuming of all head tasks of
a ptraced real-time process.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
include/linux/ipipe_base.h | 18 ++++++++++++++++++
include/linux/ipipe_domain.h | 1 +
kernel/ptrace.c | 2 ++
3 files changed, 21 insertions(+)
diff --git a/include/linux/ipipe_base.h b/include/linux/ipipe_base.h
index d8429171a550..a59e1d19eb40 100644
--- a/include/linux/ipipe_base.h
+++ b/include/linux/ipipe_base.h
@@ -164,6 +164,21 @@ do {
\
#define __ipipe_report_clockfreq_update(freq) \
__ipipe_notify_kevent(IPIPE_KEVT_CLOCKFREQ, &(freq))
+struct ipipe_ptrace_resume_data {
+ struct task_struct *task;
+ long request;
+};
+
+#define __ipipe_report_ptrace_resume(__p, __request) \
+ do { \
+ struct ipipe_ptrace_resume_data d = { \
+ .task = (__p), \
+ .request = (__request), \
+ }; \
+ if (ipipe_notifier_enabled_p(__p)) \
+ __ipipe_notify_kevent(IPIPE_KEVT_PTRESUME, &d); \
+ } while (0)
+
int __ipipe_notify_syscall(struct pt_regs *regs);
int __ipipe_notify_trap(int exception, struct pt_regs *regs);
@@ -203,6 +218,9 @@ static inline void __ipipe_report_exit(struct task_struct
*p) { }
static inline void __ipipe_report_cleanup(struct mm_struct *mm) { }
+static inline void __ipipe_report_ptrace_resume(struct task_struct *p,
+ long request) { }
+
#define __ipipe_report_trap(exception, regs) 0
#define hard_preempt_disable() ({ preempt_disable(); 0; })
diff --git a/include/linux/ipipe_domain.h b/include/linux/ipipe_domain.h
index f2ce31528389..2255659a9891 100644
--- a/include/linux/ipipe_domain.h
+++ b/include/linux/ipipe_domain.h
@@ -93,6 +93,7 @@ struct ipipe_vm_notifier;
#define IPIPE_KEVT_HOSTRT 6
#define IPIPE_KEVT_CLOCKFREQ 7
#define IPIPE_KEVT_USERINTRET 8
+#define IPIPE_KEVT_PTRESUME 9
typedef void (*ipipe_irq_ackfn_t)(struct irq_desc *desc);
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 84b1367935e4..942d71363a0c 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -809,6 +809,8 @@ static int ptrace_resume(struct task_struct *child, long
request,
user_disable_single_step(child);
}
+ __ipipe_report_ptrace_resume(child, request);
+
/*
* Change ->exit_code and ->state under siglock to avoid the race
* with wait_task_stopped() in between; a non-zero ->exit_code will
--
2.16.4
