Make struct xinpcb and friends word-size independent.

Replace size_t members with ksize_t (uint64_t) and pointer members
(never used as pointers in userspace, but instead as unique
idenitifiers) with kvaddr_t (uint64_t). This makes the structs
identical between 32-bit and 64-bit ABIs.

On 64-bit bit systems, the ABI is maintained. On 32-bit systems,
this is an ABI breaking change. The ABI of most of these structs
was previously broken in r315662.  This also imposes a small API
change on userspace consumers who must handle kernel pointers
becoming virtual addresses.

PR:		228301 (exp-run by antoine)
Reviewed by:	jtl, kib, rwatson (various versions)
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D15386

1 files changed, 9 insertions, 0 deletions

diff --git a/sys/sys/types.h b/sys/sys/types.h
index b90f88e292d5..021a3cbe24f4 100644
--- a/sys/sys/types.h
+++ b/sys/sys/types.h
@@ -251,6 +251,15 @@ struct cap_rights;
 typedef	struct cap_rights	cap_rights_t;
 #endif
 
+/*
+ * Types suitable for exporting size and pointers (as virtual addresses)
+ * from the kernel independent of native word size.  These should be
+ * used in place of size_t and (u)intptr_t in structs which contain such
+ * types that are shared with userspace.
+ */
+typedef	__uint64_t	kvaddr_t;
+typedef	__uint64_t	ksize_t;
+
 typedef	__vm_offset_t	vm_offset_t;
 typedef	__int64_t	vm_ooffset_t;
 typedef	__vm_paddr_t	vm_paddr_t;