4 files changed, 58 insertions, 0 deletions

diff --git a/sys/compat/lindebugfs/lindebugfs.c b/sys/compat/lindebugfs/lindebugfs.c
index 27db6bb60cdf..63161eedf14f 100644
--- a/sys/compat/lindebugfs/lindebugfs.c
+++ b/sys/compat/lindebugfs/lindebugfs.c
@@ -299,6 +299,9 @@ debugfs_init(PFS_INIT_ARGS)
 {
 
 	debugfs_root = pi->pi_root;
+
+	(void)debugfs_create_symlink("kcov", NULL, "/dev/kcov");
+
 	return (0);
 }
 
diff --git a/sys/compat/linsysfs/linsysfs.c b/sys/compat/linsysfs/linsysfs.c
index c00c15691fab..66cb36db9868 100644
--- a/sys/compat/linsysfs/linsysfs.c
+++ b/sys/compat/linsysfs/linsysfs.c
@@ -624,6 +624,8 @@ linsysfs_init(PFS_INIT_ARGS)
 	struct pfs_node *net;
 	struct pfs_node *power_supply;
 	struct pfs_node *devdir, *chardev;
+	struct pfs_node *kernel;
+	struct pfs_node *debug;
 	devclass_t devclass;
 	device_t dev;
 
@@ -672,6 +674,11 @@ linsysfs_init(PFS_INIT_ARGS)
 	linsysfs_listcpus(cpu);
 	linsysfs_listnics(net);
 
+	/* /sys/kernel */
+	kernel = pfs_create_dir(root, "kernel", NULL, NULL, NULL, 0);
+	/* /sys/kernel/debug, mountpoint for lindebugfs. */
+	debug = pfs_create_dir(kernel, "debug", NULL, NULL, NULL, 0);
+
 	return (0);
 }
 
diff --git a/sys/compat/linux/linux_ioctl.c b/sys/compat/linux/linux_ioctl.c
index f1083391ba6d..28c3c627cb68 100644
--- a/sys/compat/linux/linux_ioctl.c
+++ b/sys/compat/linux/linux_ioctl.c
@@ -50,6 +50,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/filio.h>
 #include <sys/jail.h>
 #include <sys/kbio.h>
+#include <sys/kcov.h>
 #include <sys/kernel.h>
 #include <sys/linker_set.h>
 #include <sys/lock.h>
@@ -117,6 +118,7 @@ static linux_ioctl_function_t linux_ioctl_v4l2;
 static linux_ioctl_function_t linux_ioctl_special;
 static linux_ioctl_function_t linux_ioctl_fbsd_usb;
 static linux_ioctl_function_t linux_ioctl_evdev;
+static linux_ioctl_function_t linux_ioctl_kcov;
 
 static struct linux_ioctl_handler cdrom_handler =
 { linux_ioctl_cdrom, LINUX_IOCTL_CDROM_MIN, LINUX_IOCTL_CDROM_MAX };
@@ -146,6 +148,8 @@ static struct linux_ioctl_handler fbsd_usb =
 { linux_ioctl_fbsd_usb, FBSD_LUSB_MIN, FBSD_LUSB_MAX };
 static struct linux_ioctl_handler evdev_handler =
 { linux_ioctl_evdev, LINUX_IOCTL_EVDEV_MIN, LINUX_IOCTL_EVDEV_MAX };
+static struct linux_ioctl_handler kcov_handler =
+{ linux_ioctl_kcov, LINUX_KCOV_MIN, LINUX_KCOV_MAX };
 
 DATA_SET(linux_ioctl_handler_set, cdrom_handler);
 DATA_SET(linux_ioctl_handler_set, vfat_handler);
@@ -161,6 +165,7 @@ DATA_SET(linux_ioctl_handler_set, video_handler);
 DATA_SET(linux_ioctl_handler_set, video2_handler);
 DATA_SET(linux_ioctl_handler_set, fbsd_usb);
 DATA_SET(linux_ioctl_handler_set, evdev_handler);
+DATA_SET(linux_ioctl_handler_set, kcov_handler);
 
 /*
  * Keep sorted by low.
@@ -3572,6 +3577,38 @@ linux_ioctl_evdev(struct thread *td, struct linux_ioctl_args *args)
 	return (sys_ioctl(td, (struct ioctl_args *)args));
 }
 
+static int
+linux_ioctl_kcov(struct thread *td, struct linux_ioctl_args *args)
+{
+	int error;
+
+	error = 0;
+	switch (args->cmd & 0xffff) {
+	case LINUX_KCOV_INIT_TRACE:
+		args->cmd = KIOSETBUFSIZE;
+		break;
+	case LINUX_KCOV_ENABLE:
+		args->cmd = KIOENABLE;
+		if (args->arg == 0)
+			args->arg = KCOV_MODE_TRACE_PC;
+		else if (args->arg == 1)
+			args->arg = KCOV_MODE_TRACE_CMP;
+		else
+			error = EINVAL;
+		break;
+	case LINUX_KCOV_DISABLE:
+		args->cmd = KIODISABLE;
+		break;
+	default:
+		error = ENOTTY;
+		break;
+	}
+
+	if (error == 0)
+		error = sys_ioctl(td, (struct ioctl_args *)args);
+	return (error);
+}
+
 /*
  * main ioctl syscall function
  */
diff --git a/sys/compat/linux/linux_ioctl.h b/sys/compat/linux/linux_ioctl.h
index c425a6e721eb..10bc9bec4390 100644
--- a/sys/compat/linux/linux_ioctl.h
+++ b/sys/compat/linux/linux_ioctl.h
@@ -762,6 +762,17 @@
 #define LINUX_IOCTL_EVDEV_MAX		0x45ff
 #define LINUX_IOCTL_EVDEV_CLK		LINUX_CLOCK_REALTIME |	\
 	    LINUX_CLOCK_MONOTONIC |LINUX_CLOCK_BOOTTIME
+
+/*
+ * kcov(4) shims
+ */
+#define	LINUX_KCOV_MIN			0x6300
+#define	LINUX_KCOV_MAX			0x63ff
+#define	LINUX_KCOV_INIT_TRACE		0x6301
+#define	LINUX_KCOV_ENABLE		0x6364
+#define	LINUX_KCOV_DISABLE		0x6365
+#define	LINUX_KCOV_REMOTE_ENABLE	0x6366
+
 /*
  * Pluggable ioctl handlers
  */