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>
/* Pull in whatever this particular arch's kernel thinks the kernel version of
 * struct stat should look like.  It turns out that each arch has a different
 * opinion on the subject, and different kernel revs use different names... */
#define kernel_stat stat
#include <bits/kernel_stat.h>
#include <bits/kernel_types.h>

/* _dl_open() parameters */
#define O_RDONLY	     00
#define O_WRONLY	     01
#define O_RDWR		     02
#define O_CREAT		   0100

/* Encoding of the file mode.  */
#define	S_IFMT		0170000	/* These bits determine file type.  */

/* File types.  */
#define	S_IFDIR		0040000	/* Directory.  */
#define	S_IFCHR		0020000	/* Character device.  */
#define	S_IFBLK		0060000	/* Block device.  */
#define	S_IFREG		0100000	/* Regular file.  */
#define	S_IFIFO		0010000	/* FIFO.  */
#define	S_IFLNK		0120000	/* Symbolic link.  */
#define	S_IFSOCK	0140000	/* Socket.  */

/* Protection bits.  */
#define	S_ISUID		04000	/* Set user ID on execution.  */
#define	S_ISGID		02000	/* Set group ID on execution.  */
#define	S_ISVTX		01000	/* Save swapped text after use (sticky).  */
#define	S_IREAD		0400	/* Read by owner.  */
#define	S_IWRITE	0200	/* Write by owner.  */
#define	S_IEXEC		0100	/* Execute by owner.  */



/* 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);

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

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

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

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

#ifdef __NR_getxpid
# define __NR_getpid __NR_getxpid
#endif
#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,
# ifdef __USE_BSD
                        struct timezone *, tz);
# else
                        void *, tz);
# endif
#endif


/* handle all the fun mmap intricacies */
#if (defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap)) || !defined(__NR_mmap2)
# define _dl_MAX_ERRNO 4096
# 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)

# 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);

/* 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);

/* 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

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)
{
	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);
}

#else
# error "Your architecture doesn't seem to provide mmap() !?"
#endif

#endif /* _LD_SYSCALL_H_ */