mirror of
https://github.com/autc04/Retro68.git
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269 lines
4.4 KiB
C
269 lines
4.4 KiB
C
/*
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* C library support files for the Blackfin processor
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*
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* Copyright (C) 2006 Analog Devices, Inc.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <_ansi.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/fcntl.h>
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#include <stdio.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include "syscall.h"
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#include <errno.h>
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#include <reent.h>
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#include <unistd.h>
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register char *stack_ptr asm ("SP");
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static inline int
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do_syscall (int reason, void *arg)
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{
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int result, result2, errcode;
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asm volatile ("excpt 0;"
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: "=q0" (result),
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"=q1" (result2),
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"=q2" (errcode)
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: "qA" (reason),
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"q0" (arg)
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: "memory", "CC");
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errno = errcode;
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return result;
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}
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int
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_read (int file, char *ptr, int len)
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{
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int block[3];
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block[0] = file;
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block[1] = (int) ptr;
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block[2] = len;
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return do_syscall (SYS_read, block);
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}
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int
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_lseek (int file, int ptr, int whence)
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{
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int block[3];
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block[0] = file;
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block[1] = ptr;
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block[2] = whence;
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return do_syscall (SYS_lseek, block);
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}
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int
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_write (int file, char *ptr, int len)
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{
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int block[3];
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block[0] = file;
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block[1] = (int) ptr;
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block[2] = len;
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return do_syscall (SYS_write, block);
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}
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int
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_open (const char *path, int flags)
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{
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int block[2];
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block[0] = (int) path;
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block[1] = flags;
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return do_syscall (SYS_open, block);
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}
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int
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_close (int file)
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{
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return do_syscall (SYS_close, &file);
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}
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void
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_exit (int n)
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{
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do_syscall (SYS_exit, &n);
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}
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int
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_kill (int n, int m)
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{
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int block[2];
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block[0] = n;
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block[1] = m;
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return do_syscall (SYS_kill, block);
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}
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int
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_getpid (int n)
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{
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return do_syscall (SYS_getpid, &n);
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}
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caddr_t
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_sbrk (int incr)
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{
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extern char end; /* Defined by the linker. */
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static char *heap_end;
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char *prev_heap_end;
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if (heap_end == NULL)
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heap_end = &end;
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prev_heap_end = heap_end;
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if (heap_end + incr > stack_ptr)
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{
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/* Some of the libstdc++-v3 tests rely upon detecting
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out of memory errors, so do not abort here. */
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#if 0
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extern void abort (void);
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_write (1, "_sbrk: Heap and stack collision\n", 32);
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abort ();
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#else
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errno = ENOMEM;
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return (caddr_t) -1;
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#endif
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}
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heap_end += incr;
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return (caddr_t) prev_heap_end;
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}
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extern void memset (struct stat *, int, unsigned int);
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int
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_fstat (int file, struct stat *st)
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{
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int block[2];
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block[0] = file;
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block[1] = (int) st;
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return do_syscall (SYS_fstat, block);
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}
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int _stat (const char *fname, struct stat *st)
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{
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int block[2];
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block[0] = (int) fname;
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block[1] = (int) st;
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return do_syscall (SYS_stat, block);
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}
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int
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_link (const char *existing, const char *new)
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{
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int block[2];
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block[0] = (int) existing;
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block[1] = (int) new;
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return do_syscall (SYS_link, block);
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}
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int
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_unlink (const char *path)
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{
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return do_syscall (SYS_unlink, path);
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}
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void
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_raise (void)
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{
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return;
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}
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int
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_gettimeofday (struct timeval *tv, void *tz)
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{
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tv->tv_usec = 0;
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tv->tv_sec = do_syscall (SYS_time, 0);
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return 0;
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}
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/* Return a clock that ticks at 100Hz. */
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clock_t
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_times (struct tms * tp)
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{
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return -1;
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}
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int
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_isatty (int fd)
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{
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return 1;
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}
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int
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_system (const char *s)
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{
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if (s == NULL)
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return 0;
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errno = ENOSYS;
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return -1;
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}
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int
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_rename (const char * oldpath, const char * newpath)
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{
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errno = ENOSYS;
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return -1;
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}
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static inline int
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__setup_argv_for_main (int argc)
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{
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int block[2];
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char **argv;
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int i = argc;
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argv = __builtin_alloca ((1 + argc) * sizeof (*argv));
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argv[i] = NULL;
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while (i--) {
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block[0] = i;
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argv[i] = __builtin_alloca (1 + do_syscall (SYS_argnlen, (void *)block));
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block[1] = (int) argv[i];
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do_syscall (SYS_argn, (void *)block);
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}
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return main (argc, argv);
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}
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int
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__setup_argv_and_call_main ()
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{
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int argc = do_syscall (SYS_argc, 0);
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if (argc <= 0)
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return main (argc, NULL);
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else
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return __setup_argv_for_main (argc);
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}
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