125 lines
3.9 KiB
C
125 lines
3.9 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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void rtems_provides_crt0( void ) {} /* dummy symbol so file always has one */
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/* RTEMS provides some of its own routines including a Malloc family */
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void *malloc() { return 0; }
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void *realloc() { return 0; }
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void free() { ; }
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void abort() { ; }
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int raise() { 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_unlock() { return -1; }
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int rtems_gxx_once() { return -1; }
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/* stubs for functions from reent.h */
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int _close_r (struct _reent *r, int fd) { return -1; }
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#if NOT_USED_BY_RTEMS
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int _execve_r (struct _reent *r, char *, char **, char **) { return -1; }
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#endif
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int _fcntl_r ( struct _reent *ptr, int fd, int cmd, int arg ) { return -1;}
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#if NOT_USED_BY_RTEMS
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int _fork_r (struct _reent *r) { return -1; }
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#endif
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int _fstat_r (struct _reent *r, int fd, struct stat *buf) { return -1; }
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int _getpid_r (struct _reent *r) { return -1; }
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int _kill_r ( struct _reent *r, int pid, int sig ) { return -1; }
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int _link_r ( struct _reent *ptr, const char *existing, const char *new) { return -1; }
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_off_t _lseek_r ( struct _reent *ptr, int fd, _off_t offset, int whence ) { return -1; }
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int _open_r (struct _reent *r, const char *buf, int flags, int mode) { return -1; }
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_ssize_t _read_r (struct _reent *r, int fd, void *buf, size_t nbytes) { return -1; }
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#if NOT_USED_BY_RTEMS
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void *_sbrk_r (struct _reent *r, ptrdiff_t) { return -1; }
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#endif
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int _stat_r (struct _reent *r, const char *path, struct stat *buf) { return -1; }
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_CLOCK_T_ _times_r (struct _reent *r, struct tms *ptms) { return -1; }
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int _unlink_r (struct _reent *r, const char *path) { return -1; }
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#if NOT_USED_BY_RTEMS
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int _wait_r (struct _reent *r, int *) { return -1; }
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#endif
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_ssize_t _write_r (struct _reent *r, int fd, const void *buf, size_t nbytes) { return -1; }
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int isatty( int fd ) { return -1; }
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_realloc_r() {}
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_calloc_r() {}
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_malloc_r() {}
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_free_r() {}
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/* gcc can implicitly generate references to these */
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/* strcmp() {} */
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/* strcpy() {} */
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/* strlen() {} */
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/* memcmp() {} */
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/* memcpy() {} */
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/* memset() {} */
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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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/* The hppa expects this to be defined in the real crt0.s.
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* Also for some reason, the hppa1.1 does not find atexit()
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* during the AC_PROG_CC tests.
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*/
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#if defined(__hppa__)
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/*
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asm ( ".subspa \$GLOBAL\$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=40");
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asm ( ".export \$global\$" );
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asm ( "\$global\$:");
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*/
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asm (".text");
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asm (".global");
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asm (".EXPORT $$dyncall,ENTRY");
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asm ("$$dyncall:");
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int atexit(void (*function)(void)) { return 0; }
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#endif
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/*
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* The AMD a29k generates code expecting the following.
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*/
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#if defined(_AM29000) || defined(_AM29K)
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asm (".global V_SPILL, V_FILL" );
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asm (".global V_EPI_OS, V_BSD_OS" );
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asm (".equ V_SPILL, 64" );
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asm (".equ V_FILL, 65" );
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asm (".equ V_BSD_OS, 66" );
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asm (".equ V_EPI_OS, 69" );
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#endif
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