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-rw-r--r--ldso/include/dl-syscall.h61
1 files changed, 34 insertions, 27 deletions
diff --git a/ldso/include/dl-syscall.h b/ldso/include/dl-syscall.h
index 7845ad9de..f5d82628f 100644
--- a/ldso/include/dl-syscall.h
+++ b/ldso/include/dl-syscall.h
@@ -121,21 +121,46 @@ static inline _syscall3(int, _dl_readlink, const char *, path, char *, buf, size
static inline _syscall2(int, _dl_gettimeofday, struct timeval *, tv, struct timezone *, tz);
#endif
-#ifdef __NR_mmap
-#ifndef _dl_MAX_ERRNO
+
+/* handle all the fun mmap intricacies */
+#if defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap) || !defined(__NR_mmap2)
# define _dl_MAX_ERRNO 4096
-#endif
-#define _dl_mmap_check_error(__res) \
+# define _dl_mmap_check_error(__res) \
(((long)__res) < 0 && ((long)__res) >= -_dl_MAX_ERRNO)
+#else
+# define MAP_FAILED ((void *) -1)
+# define _dl_mmap_check_error(X) (((void *)X) == MAP_FAILED)
+#endif
+
+/* first try mmap(), syscall6() style */
+#if defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap)
-#ifdef __UCLIBC_MMAP_HAS_6_ARGS__
-#define __NR__dl_mmap __NR_mmap
+# define __NR__dl_mmap __NR_mmap
static inline _syscall6(void *, _dl_mmap, void *, start, size_t, length,
int, prot, int, flags, int, fd, off_t, offset);
-#else
-#define __NR__dl_mmap_real __NR_mmap
-static inline _syscall1(void *, _dl_mmap_real, unsigned long *, buffer);
+/* then try mmap2() */
+#elif defined(__NR_mmap2)
+
+# 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);
+/* always 12, even on architectures where PAGE_SHIFT != 12 */
+# define MMAP2_PAGE_SHIFT 12
+static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
+ int flags, int fd, unsigned long offset)
+{
+ if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
+ return MAP_FAILED;
+ return(__syscall_mmap2(addr, size, prot, flags,
+ fd, (off_t) (offset >> MMAP2_PAGE_SHIFT)));
+}
+
+/* finally, fall back to mmap(), syscall1() style */
+#elif defined(__NR_mmap)
+
+# define __NR__dl_mmap_real __NR_mmap
+static inline _syscall1(void *, _dl_mmap_real, unsigned long *, buffer);
static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
int flags, int fd, unsigned long offset)
{
@@ -149,27 +174,9 @@ static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
buffer[5] = (unsigned long) offset;
return (void *) _dl_mmap_real(buffer);
}
-#endif
-#elif defined __NR_mmap2
-#define MAP_FAILED ((void *) -1)
-#define _dl_mmap_check_error(X) (((void *)X) == MAP_FAILED)
-#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);
-/*always 12, even on architectures where PAGE_SHIFT != 12 */
-#define MMAP2_PAGE_SHIFT 12
-static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
- int flags, int fd, unsigned long offset)
-{
- if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
- return MAP_FAILED;
- return(__syscall_mmap2(addr, size, prot, flags,
- fd, (off_t) (offset >> MMAP2_PAGE_SHIFT)));
-}
#else
# error "Your architecture doesn't seem to provide mmap() !?"
#endif
#endif /* _LD_SYSCALL_H_ */
-