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2026-10-09 18:45:50 +08:00
commit 8feba5e015
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+/*!
+    \file    syscall.c
+    \brief   system calls file
+
+    \version 2026-02-05, V3.3.3, firmware for GD32F4xx
+*/
+
+/*
+    Copyright (c) 2026, GigaDevice Semiconductor Inc.
+
+    Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice, this
+       list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holder nor the names of its contributors
+       may be used to endorse or promote products derived from this software without
+       specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+OF SUCH DAMAGE.
+*/
+
+#include <_ansi.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <errno.h>
+#include <reent.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+#undef errno
+extern int errno;
+
+extern int __io_putchar(int ch) __attribute__((weak));
+extern int __io_getchar(void) __attribute__((weak));
+
+caddr_t _sbrk(int incr)
+{
+  extern char _end[];
+  extern char _heap_end[];
+  static char *curbrk = _end;
+
+    if((curbrk + incr < _end) || (curbrk + incr > _heap_end)) {
+        return NULL - 1;
+    }
+
+  curbrk += incr;
+  return curbrk - incr;
+}
+
+/*
+ * _gettimeofday primitive (Stub function)
+ * */
+int _gettimeofday (struct timeval * tp, struct timezone * tzp)
+{
+    /* Return fixed data for the timezone.  */
+    if(tzp) {
+        tzp->tz_minuteswest = 0;
+        tzp->tz_dsttime = 0;
+    }
+
+  return 0;
+}
+void initialise_monitor_handles()
+{
+}
+
+int _getpid(void)
+{
+	return 1;
+}
+
+int _kill(int pid, int sig)
+{
+	errno = EINVAL;
+	return -1;
+}
+
+void _exit (int status)
+{
+    _kill(status, -1);
+    while(1) {
+    }
+}
+
+int _write(int file, char *ptr, int len)
+{
+	int DataIdx;
+
+    for(DataIdx = 0; DataIdx < len; DataIdx++) {
+        __io_putchar(*ptr++);
+    }
+    return len;
+}
+
+int _close(int file)
+{
+	return -1;
+}
+
+int _fstat(int file, struct stat *st)
+{
+	st->st_mode = S_IFCHR;
+	return 0;
+}
+
+int _isatty(int file)
+{
+	return 1;
+}
+
+int _lseek(int file, int ptr, int dir)
+{
+	return 0;
+}
+
+int _read(int file, char *ptr, int len)
+{
+	int DataIdx;
+
+    for(DataIdx = 0; DataIdx < len; DataIdx++) {
+        *ptr++ = __io_getchar();
+    }
+
+   return len;
+}
+
+int _open(char *path, int flags, ...)
+{
+	/* Pretend like we always fail */
+	return -1;
+}
+
+int _wait(int *status)
+{
+	errno = ECHILD;
+	return -1;
+}
+
+int _unlink(char *name)
+{
+	errno = ENOENT;
+	return -1;
+}
+
+int _times(struct tms *buf)
+{
+	return -1;
+}
+
+int _stat(char *file, struct stat *st)
+{
+	st->st_mode = S_IFCHR;
+	return 0;
+}
+
+int _link(char *old, char *new)
+{
+	errno = EMLINK;
+	return -1;
+}
+
+int _fork(void)
+{
+	errno = EAGAIN;
+	return -1;
+}
+
+int _execve(char *name, char **argv, char **env)
+{
+	errno = ENOMEM;
+	return -1;
+}