uclibc-ng/ldso/include/dl-syscall.h

/* vi: set sw=4 ts=4: */
/*
 * Copyright (C) 2000-2005 by Erik Andersen <andersen@codepoet.org>
 *
 * GNU Lesser General Public License version 2.1 or later.
 */

#ifndef _LD_SYSCALL_H_
#define _LD_SYSCALL_H_

/* Pull in the arch specific syscall implementation */
#include <dl-syscalls.h>
/* For MAP_ANONYMOUS -- differs between platforms */
#include <asm/mman.h>

#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>

/* Stuff for _dl_mmap */
#if 0
# define MAP_FAILED	((void *) -1)
# define _dl_mmap_check_error(X) (((void *)X) == MAP_FAILED)
#else
# ifndef _dl_MAX_ERRNO
#  define _dl_MAX_ERRNO 4096
# endif
# define _dl_mmap_check_error(__res) \
	(((long)__res) < 0 && ((long)__res) >= -_dl_MAX_ERRNO)
#endif



/* Here are the definitions for some syscalls that are used
   by the dynamic linker.  The idea is that we want to be able
   to call these before the errno symbol is dynamicly linked, so
   we use our own version here.  Note that we cannot assume any
   dynamic linking at all, so we cannot return any error codes.
   We just punt if there is an error. */
#define __NR__dl_exit __NR_exit
static inline _syscall1(void, _dl_exit, int, status);

#define __NR__dl_close __NR_close
static inline _syscall1(int, _dl_close, int, fd);

#define __NR__dl_open __NR_open
static inline _syscall3(int, _dl_open, const char *, fn, int, flags, __kernel_mode_t, mode);

#define __NR__dl_write __NR_write
static inline _syscall3(unsigned long, _dl_write, int, fd,
	    const void *, buf, unsigned long, count);

#define __NR__dl_read __NR_read
static inline _syscall3(unsigned long, _dl_read, int, fd,
	    const void *, buf, unsigned long, count);

#define __NR__dl_mprotect __NR_mprotect
static inline _syscall3(int, _dl_mprotect, const void *, addr, unsigned long, len, int, prot);

#define __NR__dl_stat __NR_stat
static inline _syscall2(int, _dl_stat, const char *, file_name, struct stat *, buf);

#define __NR__dl_fstat __NR_fstat
static inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf);

#define __NR__dl_munmap __NR_munmap
static inline _syscall2(int, _dl_munmap, void *, start, unsigned long, length);

#define __NR__dl_getuid __NR_getuid
static inline _syscall0(uid_t, _dl_getuid);

#define __NR__dl_geteuid __NR_geteuid
static inline _syscall0(uid_t, _dl_geteuid);

#define __NR__dl_getgid __NR_getgid
static inline _syscall0(gid_t, _dl_getgid);

#define __NR__dl_getegid __NR_getegid
static inline _syscall0(gid_t, _dl_getegid);

#define __NR__dl_getpid __NR_getpid
static inline _syscall0(gid_t, _dl_getpid);

#define __NR__dl_readlink __NR_readlink
static inline _syscall3(int, _dl_readlink, const char *, path, char *, buf, size_t, bufsiz);

#ifdef __UCLIBC_HAS_SSP__
#include <sys/time.h>
#define __NR__dl_gettimeofday __NR_gettimeofday
static inline _syscall2(int, _dl_gettimeofday, struct timeval *, tv, struct timezone *, tz);
#endif

#ifdef __NR_mmap
#ifdef MMAP_HAS_6_ARGS
#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);

static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
		int flags, int fd, unsigned long offset)
{
	unsigned long buffer[6];

	buffer[0] = (unsigned long) addr;
	buffer[1] = (unsigned long) size;
	buffer[2] = (unsigned long) prot;
	buffer[3] = (unsigned long) flags;
	buffer[4] = (unsigned long) fd;
	buffer[5] = (unsigned long) offset;
	return (void *) _dl_mmap_real(buffer);
}
#endif
#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)));
}
#else
#error "Your architecture doesn't seem to provide mmap() !?"
#endif

#endif /* _LD_SYSCALL_H_ */