[PATCH v1 8/9] staging: android: binder: Add binder compat handling to binder.h

[Serban Constantinescu <serban.constantinescu@arm.com>]

This patch adds all the needed compat structures to binder.h. All the
structures defined in this patch mirror the structure and size of 32bit
ones.

Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>
---
 drivers/staging/android/binder.h |  109 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/drivers/staging/android/binder.h b/drivers/staging/android/binder.h
index cbe3451..6c9849d 100644
--- a/drivers/staging/android/binder.h
+++ b/drivers/staging/android/binder.h
@@ -22,6 +22,10 @@
 
 #include <linux/ioctl.h>
 
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+#endif
+
 #define B_PACK_CHARS(c1, c2, c3, c4) \
 	((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))
 #define B_TYPE_LARGE 0x85
@@ -326,5 +330,110 @@ enum binder_driver_command_protocol {
 	 */
 };
 
+/* Support for 32bit userspace on a 64bit system */
+#ifdef CONFIG_COMPAT
+struct compat_flat_binder_object {
+	/* 8 bytes for large_flat_header. */
+	__u32		type;
+	__u32		flags;
+
+	/* 8 bytes of data. */
+	union {
+		compat_uptr_t	binder;	/* local object */
+		__u32	handle;	        /* remote object */
+	};
+
+	/* extra data associated with local object */
+	compat_uptr_t	cookie;
+};
+
+struct compat_binder_write_read {
+	compat_size_t	write_size;     /* bytes to write */
+	compat_size_t	write_consumed;	/* bytes consumed by driver */
+	compat_ulong_t	write_buffer;
+	compat_size_t	read_size;      /* bytes to read */
+	compat_size_t	read_consumed;	/* bytes consumed by driver */
+	compat_ulong_t	read_buffer;
+};
+
+#define COMPAT_BINDER_WRITE_READ	_IOWR('b', 1, struct compat_binder_write_read)
+
+struct compat_binder_transaction_data {
+	/* The first two are only used for bcTRANSACTION and brTRANSACTION,
+	 * identifying the target and contents of the transaction.
+	 */
+	union {
+		__u32	handle;		    /* target descriptor of command transaction */
+		compat_uptr_t	ptr;	/* target descriptor of return transaction */
+	} target;
+	compat_uptr_t	cookie;	/* target object cookie */
+	__u32		code;	    /* transaction command */
+
+	/* General information about the transaction. */
+	__u32	flags;
+	pid_t	sender_pid;
+	uid_t	sender_euid;
+	compat_size_t	data_size;	    /* number of bytes of data */
+	compat_size_t	offsets_size;	/* number of bytes of offsets */
+
+	/* If this transaction is inline, the data immediately
+	 * follows here; otherwise, it ends with a pointer to
+	 * the data buffer.
+	 */
+	union {
+		struct {
+			/* transaction data */
+			compat_uptr_t	buffer;
+			/* offsets from buffer to flat_binder_object structs */
+			compat_uptr_t	offsets;
+		} ptr;
+		__u8	buf[8];
+	} data;
+};
+
+struct compat_binder_ptr_cookie {
+	compat_uptr_t ptr;
+	compat_uptr_t cookie;
+};
+
+/* legacy - not used anymore */
+struct compat_binder_pri_ptr_cookie {
+	__s32 priority;
+	compat_uptr_t ptr;
+	compat_uptr_t cookie;
+};
+
+enum compat_binder_driver_return_protocol {
+	COMPAT_BR_TRANSACTION = _IOR('r', 2, struct compat_binder_transaction_data),
+	COMPAT_BR_REPLY = _IOR('r', 3, struct compat_binder_transaction_data),
+
+	COMPAT_BR_INCREFS = _IOR('r', 7, struct compat_binder_ptr_cookie),
+	COMPAT_BR_ACQUIRE = _IOR('r', 8, struct compat_binder_ptr_cookie),
+	COMPAT_BR_RELEASE = _IOR('r', 9, struct compat_binder_ptr_cookie),
+	COMPAT_BR_DECREFS = _IOR('r', 10, struct compat_binder_ptr_cookie),
+
+	/* legacy - not used anymore */
+	COMPAT_BR_ATTEMPT_ACQUIRE = _IOR('r', 11, struct compat_binder_pri_ptr_cookie),
+
+	COMPAT_BR_DEAD_BINDER = _IOR('r', 15, compat_uptr_t),
+	COMPAT_BR_CLEAR_DEATH_NOTIFICATION_DONE = _IOR('r', 16, compat_uptr_t),
+};
+
+enum compat_binder_driver_command_protocol {
+	COMPAT_BC_TRANSACTION = _IOW('c', 0, struct compat_binder_transaction_data),
+	COMPAT_BC_REPLY = _IOW('c', 1, struct compat_binder_transaction_data),
+
+	COMPAT_BC_FREE_BUFFER = _IOW('c', 3, compat_uptr_t),
+
+	COMPAT_BC_INCREFS_DONE = _IOW('c', 8, struct compat_binder_ptr_cookie),
+	COMPAT_BC_ACQUIRE_DONE = _IOW('c', 9, struct compat_binder_ptr_cookie),
+
+	COMPAT_BC_REQUEST_DEATH_NOTIFICATION = _IOW('c', 14, struct compat_binder_ptr_cookie),
+	COMPAT_BC_CLEAR_DEATH_NOTIFICATION = _IOW('c', 15, struct compat_binder_ptr_cookie),
+
+	COMPAT_BC_DEAD_BINDER_DONE = _IOW('c', 16, compat_uptr_t),
+};
+#endif /* CONFIG_COMPAT */
+
 #endif /* _LINUX_BINDER_H */
 
-- 
1.7.9.5