Use sys_mmap2 if it's known to be available.

1 files changed, 38 insertions, 1 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/mmap.S b/sysdeps/unix/sysv/linux/arm/mmap.S
index af93c7bce7..7beba6841c 100644
--- a/sysdeps/unix/sysv/linux/arm/mmap.S
+++ b/sysdeps/unix/sysv/linux/arm/mmap.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1998, 2000, 2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -17,11 +17,47 @@
    02111-1307 USA.  */
 
 #include <sysdep.h>
+#include <kernel-features.h>
+
+#define	EINVAL		22
 
 	.text
 
 ENTRY (__mmap)
+# ifdef __ASSUME_MMAP2_SYSCALL
+	/* This code is actually a couple of cycles slower than the
+	   sys_mmap version below, so it might seem like a loss.  But the
+	   code path inside the kernel is sufficiently much shorter to
+	   make it a net gain to use mmap2 when it's known to be
+	   available.  */
+
+	/* shuffle args */
+	str	r5, [sp, #-4]!
+	ldr	r5, [sp, #8]
+	str	r4, [sp, #-4]!
+	ldr	r4, [sp, #8]
+
+	/* convert offset to pages */
+	movs	ip, r5, lsl #20
+	bne	.Linval
+	mov	r5, r5, lsr #12
+	
+	/* do the syscall */
+	swi	SYS_ify (mmap2)
+
+	/* restore registers */
+2:
+	ldr	r4, [sp], #4
+	ldr	r5, [sp], #4
+
+	cmn	r0, $4096
+	RETINSTR(movcc, pc, lr)
+	b	PLTJMP(syscall_error)
 
+.Linval:
+	mov	r0, #-EINVAL
+	b	2b
+# else
 	/* Because we can only get five args through the syscall interface, and
 	   mmap() takes six, we need to build a parameter block and pass its
 	   address instead.  The 386 port does a similar trick.  */
@@ -49,6 +85,7 @@ ENTRY (__mmap)
 	cmn	r0, $4096
 	RETINSTR(movcc, pc, lr)
 	b	PLTJMP(syscall_error);
+#endif
 
 PSEUDO_END (__mmap)