linux(4): Deduplicate mmap2

To help porting the Linux emulation layer to a new platforms start using
Linux names for conditional builds instead of architecture-specific ifdefs.

MFC after:		1 week

7 files changed, 23 insertions, 45 deletions

diff --git a/sys/amd64/linux/linux_machdep.c b/sys/amd64/linux/linux_machdep.c
index 7da1dccd6b45..33ce902a45bd 100644
--- a/sys/amd64/linux/linux_machdep.c
+++ b/sys/amd64/linux/linux_machdep.c
@@ -69,7 +69,6 @@
 #include <amd64/linux/linux_proto.h>
 #include <compat/linux/linux_fork.h>
 #include <compat/linux/linux_misc.h>
-#include <compat/linux/linux_mmap.h>
 #include <compat/linux/linux_util.h>
 
 #define	LINUX_ARCH_AMD64		0xc000003e
@@ -90,14 +89,6 @@ linux_set_upcall(struct thread *td, register_t stack)
 }
 
 int
-linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
-{
-
-	return (linux_mmap_common(td, args->addr, args->len, args->prot,
-		args->flags, args->fd, args->pgoff));
-}
-
-int
 linux_iopl(struct thread *td, struct linux_iopl_args *args)
 {
 	int error;
diff --git a/sys/amd64/linux32/linux.h b/sys/amd64/linux32/linux.h
index 395548b3c93f..5542df1b3185 100644
--- a/sys/amd64/linux32/linux.h
+++ b/sys/amd64/linux32/linux.h
@@ -46,6 +46,10 @@
 #define	LINUX32_MAXSSIZ		(64 * 1024 * 1024)	/* 64MB */
 #define	LINUX32_MAXVMEM		0			/* Unlimited */
 
+#define	LINUX_ARCHWANT_MMAP2PGOFF	1	/* 32-bit off_t want offset
+						 * represented in multiples
+						 * of page size. */
+
 /*
  * Provide a separate set of types for the Linux types.
  */
diff --git a/sys/amd64/linux32/linux32_machdep.c b/sys/amd64/linux32/linux32_machdep.c
index fb088ae37b26..e10502f9bd80 100644
--- a/sys/amd64/linux32/linux32_machdep.c
+++ b/sys/amd64/linux32/linux32_machdep.c
@@ -321,15 +321,6 @@ linux_set_upcall(struct thread *td, register_t stack)
 }
 
 int
-linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
-{
-
-	return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot,
-		args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
-		PAGE_SIZE));
-}
-
-int
 linux_mmap(struct thread *td, struct linux_mmap_args *args)
 {
 	int error;
diff --git a/sys/arm64/linux/linux_machdep.c b/sys/arm64/linux/linux_machdep.c
index b9548387315b..3ba5683941b5 100644
--- a/sys/arm64/linux/linux_machdep.c
+++ b/sys/arm64/linux/linux_machdep.c
@@ -32,25 +32,17 @@
 #include <sys/proc.h>
 #include <sys/ptrace.h>
 #include <sys/reg.h>
-#include <sys/sdt.h>
 
 #include <vm/vm_param.h>
 
 #include <arm64/linux/linux.h>
 #include <arm64/linux/linux_proto.h>
-#include <compat/linux/linux_dtrace.h>
 #include <compat/linux/linux_fork.h>
 #include <compat/linux/linux_misc.h>
-#include <compat/linux/linux_mmap.h>
 #include <compat/linux/linux_util.h>
 
 #define	LINUX_ARCH_AARCH64		0xc00000b7
 
-/* DTrace init */
-LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
-
-/* DTrace probes */
-LIN_SDT_PROBE_DEFINE0(machdep, linux_mmap2, todo);
 
 int
 linux_set_upcall(struct thread *td, register_t stack)
@@ -67,16 +59,6 @@ linux_set_upcall(struct thread *td, register_t stack)
 	return (0);
 }
 
-/* LINUXTODO: deduplicate arm64 linux_mmap2 */
-int
-linux_mmap2(struct thread *td, struct linux_mmap2_args *uap)
-{
-
-	LIN_SDT_PROBE0(machdep, linux_mmap2, todo);
-	return (linux_mmap_common(td, PTROUT(uap->addr), uap->len, uap->prot,
-	    uap->flags, uap->fd, uap->pgoff));
-}
-
 int
 linux_set_cloned_tls(struct thread *td, void *desc)
 {
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
index b9c67d513cd3..cb781f3bad75 100644
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -365,6 +365,23 @@ linux_madvise(struct thread *td, struct linux_madvise_args *uap)
 	    uap->behav));
 }
 
+int
+linux_mmap2(struct thread *td, struct linux_mmap2_args *uap)
+{
+#if defined(LINUX_ARCHWANT_MMAP2PGOFF)
+	/*
+	 * For architectures with sizeof (off_t) < sizeof (loff_t) mmap is
+	 * implemented with mmap2 syscall and the offset is represented in
+	 * multiples of page size.
+	 */
+	return (linux_mmap_common(td, PTROUT(uap->addr), uap->len, uap->prot,
+	    uap->flags, uap->fd, (uint64_t)(uint32_t)uap->pgoff * PAGE_SIZE));
+#else
+	return (linux_mmap_common(td, PTROUT(uap->addr), uap->len, uap->prot,
+	    uap->flags, uap->fd, uap->pgoff));
+#endif
+}
+
 #ifdef LINUX_LEGACY_SYSCALLS
 int
 linux_time(struct thread *td, struct linux_time_args *args)
diff --git a/sys/i386/linux/linux.h b/sys/i386/linux/linux.h
index 643c240f8e37..914dc9c9ae84 100644
--- a/sys/i386/linux/linux.h
+++ b/sys/i386/linux/linux.h
@@ -38,6 +38,8 @@
 
 #define	LINUX_DTRACE	linuxulator
 
+#define	LINUX_ARCHWANT_MMAP2PGOFF	1
+
 /*
  * Provide a separate set of types for the Linux types.
  */
diff --git a/sys/i386/linux/linux_machdep.c b/sys/i386/linux/linux_machdep.c
index 7f1738cda845..b5d42dc22162 100644
--- a/sys/i386/linux/linux_machdep.c
+++ b/sys/i386/linux/linux_machdep.c
@@ -309,15 +309,6 @@ linux_set_upcall(struct thread *td, register_t stack)
 }
 
 int
-linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
-{
-
-	return (linux_mmap_common(td, args->addr, args->len, args->prot,
-		args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
-		PAGE_SIZE));
-}
-
-int
 linux_mmap(struct thread *td, struct linux_mmap_args *args)
 {
 	int error;