From 2b836fc1d536a44282010643e438257cb599d1d0 Mon Sep 17 00:00:00 2001 From: "Peter S. Mazinger" Date: Sat, 19 Mar 2011 13:39:32 +0100 Subject: 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 Signed-off-by: Bernhard Reutner-Fischer --- libc/sysdeps/linux/common/mmap.c | 90 ++++++++++++++++++++++------------------ 1 file changed, 49 insertions(+), 41 deletions(-) (limited to 'libc/sysdeps/linux/common/mmap.c') 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 -#include #include -#include +#include -#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 +# include +# 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 -- cgit v1.2.3