summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/common/mmap.c
diff options
context:
space:
mode:
authorPeter S. Mazinger <ps.m@gmx.net>2011-03-19 13:39:32 +0100
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2012-06-15 14:00:28 +0200
commit2b836fc1d536a44282010643e438257cb599d1d0 (patch)
tree0c7a9a4f02c673ab78453e23016d967e6ec8df70 /libc/sysdeps/linux/common/mmap.c
parentf8942a121c022cf48e5bfbc6122f28219b36751f (diff)
mmap.c: provide a common mmap.c that is good for most of archs
Remove all others, only avr32 needs to be kept. Define __UCLIBC_ARCH_HAS_6_ARGS__ where needed. Signed-off-by: Peter S. Mazinger <ps.m@gmx.net> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux/common/mmap.c')
-rw-r--r--libc/sysdeps/linux/common/mmap.c90
1 files changed, 49 insertions, 41 deletions
diff --git a/libc/sysdeps/linux/common/mmap.c b/libc/sysdeps/linux/common/mmap.c
index d53eabb18..dbc66c208 100644
--- a/libc/sysdeps/linux/common/mmap.c
+++ b/libc/sysdeps/linux/common/mmap.c
@@ -7,25 +7,57 @@
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
-#include <sys/syscall.h>
-#include <unistd.h>
#include <sys/mman.h>
-#include <bits/uClibc_page.h>
+#include <sys/syscall.h>
-#ifdef __NR_mmap
+#if defined __UCLIBC_MMAP_HAS_6_ARGS__ && defined __NR_mmap
+# ifndef _syscall6
+# error disable __UCLIBC_MMAP_HAS_6_ARGS__ for this arch
+# endif
-#ifdef __UCLIBC_MMAP_HAS_6_ARGS__
+# define __NR__mmap __NR_mmap
+static _syscall6(void *, _mmap, void *, addr, size_t, len,
+ int, prot, int, flags, int, fd, __off_t, offset)
-_syscall6(void *, mmap, void *, start, size_t, length,
- int, prot, int, flags, int, fd, off_t, offset)
+#elif defined __NR_mmap2 && defined _syscall6
-#else
+# include <errno.h>
+# include <bits/uClibc_page.h>
+# ifndef MMAP2_PAGE_SHIFT
+# define MMAP2_PAGE_SHIFT 12
+# endif
-# define __NR__mmap __NR_mmap
-static __inline__ _syscall1(__ptr_t, _mmap, unsigned long *, buffer)
-__ptr_t mmap(__ptr_t addr, size_t len, int prot,
- int flags, int fd, __off_t offset)
+# define __NR___syscall_mmap2 __NR_mmap2
+static __inline__ _syscall6(void *, __syscall_mmap2, void *, addr, size_t, len,
+ int, prot, int, flags, int, fd, __off_t, offset)
+
+static void *_mmap(void *addr, size_t len, int prot, int flags,
+ int fd, __off_t offset)
+{
+ const int mmap2_shift = MMAP2_PAGE_SHIFT;
+ const __off_t mmap2_mask = ((__off_t) 1 << MMAP2_PAGE_SHIFT) - 1;
+ /* check if offset is page aligned */
+ if (offset & mmap2_mask) {
+ __set_errno(EINVAL);
+ return MAP_FAILED;
+ }
+# ifdef __USE_FILE_OFFSET64
+ return __syscall_mmap2(addr, len, prot, flags, fd,
+ ((__u_quad_t) offset >> mmap2_shift));
+# else
+ return __syscall_mmap2(addr, len, prot, flags, fd,
+ ((__u_long) offset >> mmap2_shift));
+# endif
+}
+
+#elif defined __NR_mmap
+
+# define __NR___syscall_mmap __NR_mmap
+static __inline__ _syscall1(void *, __syscall_mmap, unsigned long *, buffer)
+
+static void *_mmap(void *addr, size_t len, int prot, int flags,
+ int fd, __off_t offset)
{
unsigned long buffer[6];
@@ -35,38 +67,14 @@ __ptr_t mmap(__ptr_t addr, size_t len, int prot,
buffer[3] = (unsigned long) flags;
buffer[4] = (unsigned long) fd;
buffer[5] = (unsigned long) offset;
- return (__ptr_t) _mmap(buffer);
+ return __syscall_mmap(buffer);
}
-#endif
-
-libc_hidden_def(mmap)
-
-#elif defined(__NR_mmap2)
-
+#else
-#define __NR___syscall_mmap2 __NR_mmap2
-static __inline__ _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr,
- size_t, len, int, prot, int, flags, int, fd, off_t, offset)
+# error "Your architecture doesn't seem to provide mmap() !?"
-/* Some architectures always use 12 as page shift for mmap2() eventhough the
- * real PAGE_SHIFT != 12. Other architectures use the same value as
- * PAGE_SHIFT...
- */
-# ifndef MMAP2_PAGE_SHIFT
-# define MMAP2_PAGE_SHIFT 12
-# endif
-
-__ptr_t mmap(__ptr_t addr, size_t len, int prot, int flags, int fd, __off_t offset)
-{
- if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) {
- __set_errno(EINVAL);
- return MAP_FAILED;
- }
- return __syscall_mmap2(addr, len, prot, flags,
- fd, ((__u_long) offset >> MMAP2_PAGE_SHIFT));
-}
+#endif
+strong_alias(_mmap,mmap)
libc_hidden_def(mmap)
-
-#endif