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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [bfin/] [syscalls.c] - Rev 455
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/* * C library support files for the Blackfin processor * * Copyright (C) 2006 Analog Devices, Inc. * * The authors hereby grant permission to use, copy, modify, distribute, * and license this software and its documentation for any purpose, provided * that existing copyright notices are retained in all copies and that this * notice is included verbatim in any distributions. No written agreement, * license, or royalty fee is required for any of the authorized uses. * Modifications to this software may be copyrighted by their authors * and need not follow the licensing terms described here, provided that * the new terms are clearly indicated on the first page of each file where * they apply. */ #include <_ansi.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/fcntl.h> #include <stdio.h> #include <time.h> #include <sys/time.h> #include <sys/times.h> #include "syscall.h" #include <errno.h> #include <reent.h> #include <unistd.h> register char *stack_ptr asm ("SP"); static inline int do_syscall (int reason, void *arg) { register int r asm ("P0") = reason; register void *a asm ("R0") = arg; register int result asm ("R0"); asm volatile ("excpt 0;" : "=r" (result) : "a" (r), "r" (a) : "memory", "CC"); return result; } int _read (int file, char *ptr, int len) { int block[3]; block[0] = file; block[1] = (int) ptr; block[2] = len; return do_syscall (SYS_read, block); } int _lseek (int file, int ptr, int dir) { int block[2]; block[0] = file; block[1] = ptr; return do_syscall (SYS_lseek, block); } int _write (int file, char *ptr, int len) { int block[3]; block[0] = file; block[1] = (int) ptr; block[2] = len; return do_syscall (SYS_write, block); } int _open (const char *path, int flags) { int block[2]; block[0] = (int) path; block[1] = flags; return do_syscall (SYS_open, block); } int _close (int file) { return do_syscall (SYS_close, &file); } void _exit (int n) { do_syscall (SYS_exit, &n); } int _kill (int n, int m) { int block[2]; block[0] = n; block[1] = m; return do_syscall (SYS_kill, block); } int _getpid (int n) { return 1; } caddr_t _sbrk (int incr) { extern char end; /* Defined by the linker. */ static char *heap_end; char *prev_heap_end; if (heap_end == NULL) heap_end = &end; prev_heap_end = heap_end; if (heap_end + incr > stack_ptr) { /* Some of the libstdc++-v3 tests rely upon detecting out of memory errors, so do not abort here. */ #if 0 extern void abort (void); _write (1, "_sbrk: Heap and stack collision\n", 32); abort (); #else errno = ENOMEM; return (caddr_t) -1; #endif } heap_end += incr; return (caddr_t) prev_heap_end; } extern void memset (struct stat *, int, unsigned int); int _fstat (int file, struct stat * st) { memset (st, 0, sizeof (* st)); st->st_mode = S_IFCHR; st->st_blksize = 1024; return 0; } int _stat (const char *fname, struct stat *st) { int file; /* The best we can do is try to open the file readonly. If it exists, then we can guess a few things about it. */ if ((file = _open (fname, O_RDONLY)) < 0) return -1; memset (st, 0, sizeof (* st)); st->st_mode = S_IFREG | S_IREAD; st->st_blksize = 1024; _close (file); /* Not interested in the error. */ return 0; } int _link (void) { return -1; } int _unlink (void) { return -1; } void _raise (void) { return; } int _gettimeofday (struct timeval *tv, void *tz) { tv->tv_usec = 0; tv->tv_sec = do_syscall (SYS_time, 0); return 0; } /* Return a clock that ticks at 100Hz. */ clock_t _times (struct tms * tp) { return -1; } int _isatty (int fd) { return 1; } int _system (const char *s) { if (s == NULL) return 0; errno = ENOSYS; return -1; } int _rename (const char * oldpath, const char * newpath) { errno = ENOSYS; return -1; } static inline int __setup_argv_for_main (int argc) { int block[2]; char **argv; int i = argc; argv = __builtin_alloca ((1 + argc) * sizeof (*argv)); argv[i] = NULL; while (i--) { block[0] = i; argv[i] = __builtin_alloca (1 + do_syscall (SYS_argnlen, (void *)block)); block[1] = (int) argv[i]; do_syscall (SYS_argn, (void *)block); } return main (argc, argv); } int __setup_argv_and_call_main () { int argc = do_syscall (SYS_argc, 0); if (argc <= 0) return main (argc, NULL); else return __setup_argv_for_main (argc); }
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