1 /* vi: set sw=4 ts=4: */
3 * Copyright (C) 2000-2005 by Erik Andersen <andersen@codepoet.org>
5 * GNU Lesser General Public License version 2.1 or later.
11 /* Pull in the arch specific syscall implementation */
12 #include <dl-syscalls.h>
13 /* For MAP_ANONYMOUS -- differs between platforms */
15 #include <bits/mman.h>
16 /* Pull in whatever this particular arch's kernel thinks the kernel version of
17 * struct stat should look like. It turns out that each arch has a different
18 * opinion on the subject, and different kernel revs use different names... */
19 #if defined(__sparc_v9__) && (__WORDSIZE == 64)
20 #define kernel_stat64 stat
22 #define kernel_stat stat
24 #include <bits/kernel_stat.h>
25 #include <bits/kernel_types.h>
27 /* _dl_open() parameters */
33 /* Encoding of the file mode. */
34 #define S_IFMT 0170000 /* These bits determine file type. */
37 #define S_IFDIR 0040000 /* Directory. */
38 #define S_IFCHR 0020000 /* Character device. */
39 #define S_IFBLK 0060000 /* Block device. */
40 #define S_IFREG 0100000 /* Regular file. */
41 #define S_IFIFO 0010000 /* FIFO. */
42 #define S_IFLNK 0120000 /* Symbolic link. */
43 #define S_IFSOCK 0140000 /* Socket. */
45 /* Protection bits. */
46 #define S_ISUID 04000 /* Set user ID on execution. */
47 #define S_ISGID 02000 /* Set group ID on execution. */
48 #define S_ISVTX 01000 /* Save swapped text after use (sticky). */
49 #define S_IREAD 0400 /* Read by owner. */
50 #define S_IWRITE 0200 /* Write by owner. */
51 #define S_IEXEC 0100 /* Execute by owner. */
55 /* Here are the definitions for some syscalls that are used
56 by the dynamic linker. The idea is that we want to be able
57 to call these before the errno symbol is dynamicly linked, so
58 we use our own version here. Note that we cannot assume any
59 dynamic linking at all, so we cannot return any error codes.
60 We just punt if there is an error. */
61 #define __NR__dl_exit __NR_exit
62 static __always_inline attribute_noreturn void _dl_exit(int status)
65 INLINE_SYSCALL(exit, 1, status);
68 #define __NR__dl_close __NR_close
69 static __always_inline _syscall1(int, _dl_close, int, fd);
71 #define __NR__dl_open __NR_open
72 static __always_inline _syscall3(int, _dl_open, const char *, fn, int, flags,
73 __kernel_mode_t, mode);
75 #define __NR__dl_write __NR_write
76 static __always_inline _syscall3(unsigned long, _dl_write, int, fd,
77 const void *, buf, unsigned long, count);
79 #define __NR__dl_read __NR_read
80 static __always_inline _syscall3(unsigned long, _dl_read, int, fd,
81 const void *, buf, unsigned long, count);
83 #define __NR__dl_mprotect __NR_mprotect
84 static __always_inline _syscall3(int, _dl_mprotect, const void *, addr,
85 unsigned long, len, int, prot);
87 #define __NR__dl_stat __NR_stat
88 static __always_inline _syscall2(int, _dl_stat, const char *, file_name,
91 #define __NR__dl_fstat __NR_fstat
92 static __always_inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf);
94 #define __NR__dl_munmap __NR_munmap
95 static __always_inline _syscall2(int, _dl_munmap, void *, start, unsigned long, length);
98 # define __NR_getuid __NR_getxuid
100 #define __NR__dl_getuid __NR_getuid
101 static __always_inline _syscall0(uid_t, _dl_getuid);
104 # define __NR_geteuid __NR_getuid
106 #define __NR__dl_geteuid __NR_geteuid
107 static __always_inline _syscall0(uid_t, _dl_geteuid);
110 # define __NR_getgid __NR_getxgid
112 #define __NR__dl_getgid __NR_getgid
113 static __always_inline _syscall0(gid_t, _dl_getgid);
116 # define __NR_getegid __NR_getgid
118 #define __NR__dl_getegid __NR_getegid
119 static __always_inline _syscall0(gid_t, _dl_getegid);
122 # define __NR_getpid __NR_getxpid
124 #define __NR__dl_getpid __NR_getpid
125 static __always_inline _syscall0(gid_t, _dl_getpid);
127 #define __NR__dl_readlink __NR_readlink
128 static __always_inline _syscall3(int, _dl_readlink, const char *, path, char *, buf,
131 #ifdef __UCLIBC_HAS_SSP__
132 # include <sys/time.h>
133 # define __NR__dl_gettimeofday __NR_gettimeofday
134 static inline _syscall2(int, _dl_gettimeofday, struct timeval *, tv,
136 struct timezone *, tz);
143 /* handle all the fun mmap intricacies */
144 #if (defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap)) || !defined(__NR_mmap2)
145 # define _dl_MAX_ERRNO 4096
146 # define _dl_mmap_check_error(__res) \
147 (((long)__res) < 0 && ((long)__res) >= -_dl_MAX_ERRNO)
149 # define MAP_FAILED ((void *) -1)
150 # define _dl_mmap_check_error(X) (((void *)X) == MAP_FAILED)
153 /* first try mmap(), syscall6() style */
154 #if defined(__UCLIBC_MMAP_HAS_6_ARGS__) && defined(__NR_mmap)
156 # define __NR__dl_mmap __NR_mmap
157 static __always_inline _syscall6(void *, _dl_mmap, void *, start, size_t, length,
158 int, prot, int, flags, int, fd, off_t, offset);
160 /* then try mmap2() */
161 #elif defined(__NR_mmap2)
163 # define __NR___syscall_mmap2 __NR_mmap2
164 static __always_inline _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr, size_t, len,
165 int, prot, int, flags, int, fd, off_t, offset);
167 /* Some architectures always use 12 as page shift for mmap2() eventhough the
168 * real PAGE_SHIFT != 12. Other architectures use the same value as
171 #ifndef MMAP2_PAGE_SHIFT
172 # define MMAP2_PAGE_SHIFT 12
175 static __always_inline void * _dl_mmap(void * addr, unsigned long size, int prot,
176 int flags, int fd, unsigned long offset)
178 if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
180 return __syscall_mmap2(addr, size, prot, flags,
181 fd, (off_t) (offset >> MMAP2_PAGE_SHIFT));
184 /* finally, fall back to mmap(), syscall1() style */
185 #elif defined(__NR_mmap)
187 # define __NR__dl_mmap_real __NR_mmap
188 static __always_inline _syscall1(void *, _dl_mmap_real, unsigned long *, buffer);
189 static __always_inline void * _dl_mmap(void * addr, unsigned long size, int prot,
190 int flags, int fd, unsigned long offset)
192 unsigned long buffer[6];
194 buffer[0] = (unsigned long) addr;
195 buffer[1] = (unsigned long) size;
196 buffer[2] = (unsigned long) prot;
197 buffer[3] = (unsigned long) flags;
198 buffer[4] = (unsigned long) fd;
199 buffer[5] = (unsigned long) offset;
200 return (void *) _dl_mmap_real(buffer);
204 # error "Your architecture doesn't seem to provide mmap() !?"
207 #endif /* _LD_SYSCALL_H_ */