From: Aleksandar Markovic <amarkovic@wavecomp.com>

KCOV_ENABLE and KCOV_DISABLE play the role in kernel coverage
tracing. These ioctls do not use the third argument of ioctl()
system call and are straightforward to implement in QEMU.

Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
---
 linux-user/ioctls.h       | 5 +++++
 linux-user/syscall.c      | 3 +++
 linux-user/syscall_defs.h | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 060ab28..6be143a 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -543,3 +543,8 @@
   IOCTL_IGNORE(TIOCSTART)
   IOCTL_IGNORE(TIOCSTOP)
 #endif
+
+#ifdef CONFIG_KCOV
+  IOCTL(KCOV_ENABLE, 0, TYPE_NULL)
+  IOCTL(KCOV_DISABLE, 0, TYPE_NULL)
+#endif
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 171c0ca..6edcb0d 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -73,6 +73,9 @@
 #ifdef CONFIG_SENDFILE
 #include <sys/sendfile.h>
 #endif
+#ifdef CONFIG_KCOV
+#include <sys/kcov.h>
+#endif
 
 #define termios host_termios
 #define winsize host_winsize
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 75604e7..ab4414f 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -2454,6 +2454,10 @@ struct target_mtpos {
 #define TARGET_MTIOCGET        TARGET_IOR('m', 2, struct target_mtget)
 #define TARGET_MTIOCPOS        TARGET_IOR('m', 3, struct target_mtpos)
 
+/* kcov ioctls */
+#define TARGET_KCOV_ENABLE     TARGET_IO('c', 100)
+#define TARGET_KCOV_DISABLE    TARGET_IO('c', 101)
+
 struct target_sysinfo {
     abi_long uptime;                /* Seconds since boot */
     abi_ulong loads[3];             /* 1, 5, and 15 minute load averages */
-- 
2.7.4