diff options
| -rw-r--r-- | ldso/include/dl-syscall.h | 61 |
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_ */ - |