[y2038][RFC PATCH 2/2] y2038: Adding sem_timedwait_time64

[Florian Bezdeka <florian.bezdeka@siemens.com>]

Implementation is heavily inspired by the sem_timedwait syscall,
but expecting time64 based timespec / timeout.

We need two new syscall handlers:
  - The native one (COBALT_SYSCALL()) to get 32 bit kernels time64
    aware. This handler is added for 64 bit kernels as well, but not
    used. As we don't have separate syscall tables for this both
    worlds we have to add it.

 - The compat handler (COBALT_SYSCALL32emu()) for x32 or x86
   applications running on an x86_64 kernel. Otherwise the redirection
   to the compat / emulation syscalls is broken.

Signed-off-by: Florian Bezdeka <florian.bezdeka@siemens.com>
---
 include/cobalt/uapi/syscall.h   |  1 +
 kernel/cobalt/posix/sem.c       | 12 ++++++++++++
 kernel/cobalt/posix/sem.h       |  4 ++++
 kernel/cobalt/posix/syscall32.c | 12 ++++++++++++
 kernel/cobalt/posix/syscall32.h |  4 ++++
 5 files changed, 33 insertions(+)

diff --git a/include/cobalt/uapi/syscall.h b/include/cobalt/uapi/syscall.h
index aa3c308d0..9b005da47 100644
--- a/include/cobalt/uapi/syscall.h
+++ b/include/cobalt/uapi/syscall.h
@@ -122,6 +122,7 @@
 #define sc_cobalt_sendmmsg			99
 #define sc_cobalt_clock_adjtime			100
 #define sc_cobalt_thread_setschedprio		101
+#define sc_cobalt_sem_timedwait_time64		102
 
 #define __NR_COBALT_SYSCALLS			128 /* Power of 2 */
 
diff --git a/kernel/cobalt/posix/sem.c b/kernel/cobalt/posix/sem.c
index a0565e9f8..a2211af36 100644
--- a/kernel/cobalt/posix/sem.c
+++ b/kernel/cobalt/posix/sem.c
@@ -430,6 +430,18 @@ COBALT_SYSCALL(sem_timedwait, primary,
 	return __cobalt_sem_timedwait(u_sem, &ts64);
 }
 
+COBALT_SYSCALL(sem_timedwait_time64, primary,
+	       (struct cobalt_sem_shadow __user *u_sem,
+		const struct __kernel_timespec __user *u_ts))
+{
+	struct timespec64 ts64;
+
+	if (get_timespec64(&ts64, u_ts))
+		return -EFAULT;
+
+	return __cobalt_sem_timedwait(u_sem, &ts64);
+}
+
 COBALT_SYSCALL(sem_trywait, primary,
 	       (struct cobalt_sem_shadow __user *u_sem))
 {
diff --git a/kernel/cobalt/posix/sem.h b/kernel/cobalt/posix/sem.h
index 658e11f7a..8491b69ba 100644
--- a/kernel/cobalt/posix/sem.h
+++ b/kernel/cobalt/posix/sem.h
@@ -66,6 +66,10 @@ __cobalt_sem_open(struct cobalt_sem_shadow __user *usm,
 int __cobalt_sem_timedwait(struct cobalt_sem_shadow __user *u_sem,
 			   const struct timespec64 *ts);
 
+COBALT_SYSCALL_DECL(sem_timedwait_time64,
+		    (struct cobalt_sem_shadow __user *u_sem,
+		     const struct __kernel_timespec __user *u_ts));
+
 int __cobalt_sem_destroy(xnhandle_t handle);
 
 void cobalt_nsem_reclaim(struct cobalt_process *process);
diff --git a/kernel/cobalt/posix/syscall32.c b/kernel/cobalt/posix/syscall32.c
index c2a2423ed..d50532952 100644
--- a/kernel/cobalt/posix/syscall32.c
+++ b/kernel/cobalt/posix/syscall32.c
@@ -136,6 +136,18 @@ COBALT_SYSCALL32emu(sem_timedwait, primary,
 	return __cobalt_sem_timedwait(u_sem, &ts64);
 }
 
+COBALT_SYSCALL32emu(sem_timedwait_time64, primary,
+		    (struct cobalt_sem_shadow __user *u_sem,
+		     const struct __kernel_timespec __user *u_ts))
+{
+	struct timespec64 ts64;
+
+	if (get_timespec64(&ts64, u_ts))
+		return -EFAULT;
+
+	return __cobalt_sem_timedwait(u_sem, &ts64);
+}
+
 COBALT_SYSCALL32emu(clock_getres, current,
 		    (clockid_t clock_id,
 		     struct old_timespec32 __user *u_ts))
diff --git a/kernel/cobalt/posix/syscall32.h b/kernel/cobalt/posix/syscall32.h
index d72fd2022..3612bf751 100644
--- a/kernel/cobalt/posix/syscall32.h
+++ b/kernel/cobalt/posix/syscall32.h
@@ -231,4 +231,8 @@ COBALT_SYSCALL32emu_DECL(sem_timedwait,
 			 (struct cobalt_sem_shadow __user *u_sem,
 			  const struct old_timespec32 __user *u_ts));
 
+COBALT_SYSCALL32emu_DECL(sem_timedwait_time64,
+			 (struct cobalt_sem_shadow __user * u_sem,
+			  const struct __kernel_timespec __user *u_ts));
+
 #endif /* !_COBALT_POSIX_SYSCALL32_H */
-- 
2.29.2