175 lines
7.7 KiB
C
175 lines
7.7 KiB
C
/*
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* RTEMS Fake crt0
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*
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* Each RTEMS BSP provides its own crt0 and linker script. Unfortunately
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* this means that crt0 and the linker script are not available as
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* each tool is configured. Without a crt0 and linker script, some
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* targets do not successfully link "conftest.c" during the configuration
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* process. So this fake crt0.c provides all the symbols required to
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* successfully link a program. The resulting program will not run
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* but this is enough to satisfy the autoconf macro AC_PROG_CC.
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*/
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#include <reent.h>
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#include <signal.h> /* sigset_t */
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#include <time.h> /* struct timespec */
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#include <unistd.h> /* isatty */
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void rtems_provides_crt0( void ) {} /* dummy symbol so file always has one */
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#define RTEMS_STUB(ret, func, body) \
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ret rtems_stub_##func body; \
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ret func body
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/* RTEMS provides some of its own routines including a Malloc family */
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RTEMS_STUB(void *,malloc(size_t s), { return 0; })
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RTEMS_STUB(void *,realloc(void* p, size_t s), { return 0; })
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RTEMS_STUB(void, free(void* ptr), { })
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RTEMS_STUB(_PTR, calloc(size_t s1, size_t s2), { return 0; })
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#if defined(__GNUC__)
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/*
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* stubs for libstdc++ rtems-threads support functions from gcc/gthr-rtems.h
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*/
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int rtems_gxx_once() { return -1; }
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int rtems_gxx_key_create() { return -1; }
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int rtems_gxx_key_delete() { return -1; }
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void *rtems_gxx_getspecific() { return 0; }
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int rtems_gxx_setspecific() { return -1; }
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void rtems_gxx_mutex_init() { }
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int rtems_gxx_mutex_lock() { return -1; }
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int rtems_gxx_mutex_trylock() { return -1; }
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int rtems_gxx_mutex_unlock() { return -1; }
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void rtems_gxx_recursive_mutex_init() { }
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int rtems_gxx_recursive_mutex_lock() { return -1; }
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int rtems_gxx_recursive_mutex_trylock() { return -1; }
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int rtems_gxx_recursive_mutex_unlock() { return -1; }
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#endif
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/* stubs for functions RTEMS provides */
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RTEMS_STUB(int, access(const char *pathname, int mode), { return -1; })
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RTEMS_STUB(int, clock_gettime(clockid_t clk_id, struct timespec *tp), { return -1; })
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RTEMS_STUB(int, close (int fd), { return -1; })
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RTEMS_STUB(int, dup2(int oldfd, int newfd), { return -1; })
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RTEMS_STUB(int, fcntl( int fd, int cmd, ... /* arg */ ), { return -1; })
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RTEMS_STUB(pid_t, fork(void), { return -1; })
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RTEMS_STUB(int, fstat(int fd, struct stat *buf), { return -1; })
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RTEMS_STUB(int, getdents(int fd, void *dp, int count), { return -1; })
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RTEMS_STUB(char *, getlogin(void), { return 0; })
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RTEMS_STUB(int, gettimeofday(struct timeval *__restrict tv, struct timezone *__restrict tz), { return -1; })
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RTEMS_STUB(struct passwd *, getpwnam(const char *name), { return 0; })
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RTEMS_STUB(struct passwd *, getpwuid(uid_t uid), { return 0; })
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RTEMS_STUB(uid_t, getuid(void), { return 0; })
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RTEMS_STUB(int, nanosleep(const struct timespec *req, struct timespec *rem), { return -1; })
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RTEMS_STUB(int, ftruncate(int fd, off_t length), { return -1; })
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RTEMS_STUB(_off_t, lseek(int fd, _off_t offset, int whence), { return -1; })
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RTEMS_STUB(int, lstat(const char *path, struct stat *buf), { return -1; })
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RTEMS_STUB(int, open(const char *pathname, int flags, int mode), { return -1; })
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RTEMS_STUB(int, pipe(int pipefd[2]), { return -1; })
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RTEMS_STUB(_ssize_t, read(int fd, void *buf, size_t count), { return -1; })
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RTEMS_STUB(int, sched_yield(void), { return -1; })
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RTEMS_STUB(int, sigfillset(sigset_t *set), { return -1; })
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RTEMS_STUB(int, sigprocmask(int how, const sigset_t *set, sigset_t *oldset), { return -1; })
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RTEMS_STUB(int, stat(const char *path, struct stat *buf), { return -1; })
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RTEMS_STUB(int, unlink(const char *pathname), { return -1; })
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RTEMS_STUB(pid_t, vfork(void), { return -1; })
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#if !defined(_NO_POPEN) && !defined(_NO_WORDEXP)
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/* pulled in by libc/sys/posix/popen.c and libc/sys/posix/word*.c */
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RTEMS_STUB(int, waitpid (pid_t pid, int *status, int options), { return -1; })
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#endif
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RTEMS_STUB(_ssize_t, write (int fd, const void *buf, size_t nbytes), { return -1; })
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/* stubs for functions from reent.h */
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RTEMS_STUB(int, _close_r (struct _reent *r, int fd), { return -1; })
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#if defined(_NO_EXECVE)
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RTEMS_STUB(int, _execve_r (struct _reent *r, char *, char **, char **), { return -1; })
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#endif
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RTEMS_STUB(int, _fcntl_r (struct _reent *ptr, int fd, int cmd, int arg ), { return -1; })
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#if !(defined (REENTRANT_SYSCALLS_PROVIDED) || defined (NO_EXEC))
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#ifndef NO_FORK
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/* cf. newlib/libc/reent/execr.c */
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RTEMS_STUB(int, _fork_r (struct _reent *r), { return -1; })
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#endif
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#endif
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RTEMS_STUB(int, _fstat_r (struct _reent *r, int fd, struct stat *buf), { return -1; })
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RTEMS_STUB(uid_t, geteuid (), { return -1; })
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RTEMS_STUB(gid_t, getgid (), { return -1; })
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RTEMS_STUB(gid_t, _getgid_r (struct _reent *r), { return -1; })
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RTEMS_STUB(pid_t, getpid (), { return -1; })
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RTEMS_STUB(pid_t, getppid (), { return -1; })
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RTEMS_STUB(pid_t, _getpid_r (struct _reent *r), { return -1; })
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RTEMS_STUB(int, _gettimeofday_r(struct _reent *r, struct timeval *tp, void *tzp), { return 0; })
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RTEMS_STUB(int, _isatty_r (struct _reent *r, int fd), { return isatty( fd ); })
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RTEMS_STUB(int, _kill_r (struct _reent *r, int pid, int sig ), { return -1; })
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#if !defined(REENTRANT_SYSCALLS_PROVIDED)
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/* cf. newlib/libc/reent/linkr.c */
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RTEMS_STUB(int, _link_r (struct _reent *r, const char *oldpath, const char *newpath), { return -1; })
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#endif
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RTEMS_STUB(_off_t, _lseek_r ( struct _reent *ptr, int fd, _off_t offset, int whence ), { return -1; })
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RTEMS_STUB(int, _open_r (struct _reent *r, const char *buf, int flags, int mode), { return -1; })
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RTEMS_STUB(_ssize_t, _read_r (struct _reent *r, int fd, void *buf, size_t nbytes), { return -1; })
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RTEMS_STUB(int, _rename_r (struct _reent *r, const char *a, const char *b), { return -1; })
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#if !(defined (REENTRANT_SYSCALLS_PROVIDED) || defined (MALLOC_PROVIDED))
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/* cf. newlib/libc/reent/sbrkr.c */
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RTEMS_STUB(void *,_sbrk_r (struct _reent *r, ptrdiff_t addr), { return 0; })
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#endif
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RTEMS_STUB(int, _stat_r (struct _reent *r, const char *path, struct stat *buf), { return -1; })
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RTEMS_STUB(_CLOCK_T_, _times_r (struct _reent *r, struct tms *ptms), { return -1; })
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RTEMS_STUB(int, _unlink_r (struct _reent *r, const char *path), { return -1; })
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#if !(defined (REENTRANT_SYSCALLS_PROVIDED) || defined (NO_EXEC))
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/* cf. newlib/libc/reent/execr.c */
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RTEMS_STUB(int, _wait_r (struct _reent *r, int *status), { return -1; })
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#endif
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RTEMS_STUB(_ssize_t, _write_r (struct _reent *r, int fd, const void *buf, size_t nbytes), { return -1; })
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RTEMS_STUB(int, _execve(const char *path, char * const *argv, char * const *envp), { return -1; })
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RTEMS_STUB(void, _exit(int status), { while(1); })
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/* Pulled in by newlib/libc/posix/glob.c */
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#ifndef _NO_GLOB
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#ifndef __NETBSD_SYSCALLS
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RTEMS_STUB(int, issetugid (void), { return 0; })
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#endif
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#endif
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/* stdlib.h */
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RTEMS_STUB(_PTR, _realloc_r(struct _reent *r, _PTR p, size_t s), { return 0; })
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RTEMS_STUB(_PTR, _calloc_r(struct _reent *r, size_t s1, size_t s2), { return 0; })
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RTEMS_STUB(_PTR, _malloc_r(struct _reent * r, size_t s), { return 0; })
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RTEMS_STUB(_VOID, _free_r(struct _reent *r, _PTR *p), { })
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/* stubs for functions required by libc/stdlib */
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RTEMS_STUB(void, __assert_func(const char *file, int line, const char *failedexpr), { })
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/* The PowerPC expects certain symbols to be defined in the linker script. */
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#if defined(__PPC__)
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int __SDATA_START__; int __SDATA2_START__;
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int __GOT_START__; int __GOT_END__;
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int __GOT2_START__; int __GOT2_END__;
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int __SBSS_END__; int __SBSS2_END__;
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int __FIXUP_START__; int __FIXUP_END__;
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int __EXCEPT_START__; int __EXCEPT_END__;
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int __init; int __fini;
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int __CTOR_LIST__; int __CTOR_END__;
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int __DTOR_LIST__; int __DTOR_END__;
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#endif
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/* The SH expects certain symbols to be defined in the linker script. */
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#if defined(__sh__)
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int __EH_FRAME_BEGIN__;
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#endif
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#if defined(__AVR__)
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/*
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* Initial stack pointer address "__stack"
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* hard coded into GCC instead of providing it through ldscripts
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*/
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const char* __stack ;
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#endif
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