xtensa: hostfs using simcall

Tested on qemu -semihosting

arch/xtensa/src/common/xtensa_hostfs.c

@@ -0,0 +1,231 @@
+/****************************************************************************
+ * arch/xtensa/src/common/xtensa_hostfs.c
+ *
+ *   Copyright (C) 2018 Pinecone Inc. All rights reserved.
+ *   Author: Xiang Xiao <xiaoxiang@pinecone.net>
+ *
+ * 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 NuttX 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 OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/fs/hostfs.h>
+
+#include <arch/simcall.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <syscall.h>
+#include <unistd.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static int host_call(int nr, int param1, int param2, int param3)
+{
+  int ret;
+  int err;
+
+  ret = simcall(nr, param1, param2, param3, &err);
+  if (ret < 0)
+    {
+      ret = -err;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int host_open(const char *pathname, int flags, int mode)
+{
+  int simcall_flags = 0;
+
+  switch ((flags & O_ACCMODE))
+    {
+      case O_RDONLY:
+        simcall_flags = SIMCALL_O_RDONLY;
+        break;
+      case O_WRONLY:
+        simcall_flags = SIMCALL_O_WRONLY;
+        break;
+      case O_RDWR:
+        simcall_flags = SIMCALL_O_RDWR;
+        break;
+    }
+
+  if ((flags & O_APPEND) != 0)
+    {
+      simcall_flags |= SIMCALL_O_APPEND;
+    }
+
+  if ((flags & O_TRUNC) != 0)
+    {
+      simcall_flags |= SIMCALL_O_TRUNC;
+    }
+
+  if ((flags & O_CREAT) != 0)
+    {
+      simcall_flags |= SIMCALL_O_CREAT;
+    }
+
+  if ((flags & O_EXCL) != 0)
+    {
+      simcall_flags |= SIMCALL_O_EXCL;
+    }
+
+  return host_call(SIMCALL_SYS_OPEN, (int)pathname, simcall_flags, mode);
+}
+
+int host_close(int fd)
+{
+  return host_call(SIMCALL_SYS_CLOSE, fd, 0, 0);
+}
+
+ssize_t host_read(int fd, void *buf, size_t count)
+{
+  return host_call(SIMCALL_SYS_READ, fd, (int)buf, count);
+}
+
+ssize_t host_write(int fd, const void *buf, size_t count)
+{
+  return host_call(SIMCALL_SYS_WRITE, fd, (int)buf, count);
+}
+
+off_t host_lseek(int fd, off_t offset, int whence)
+{
+  return host_call(SIMCALL_SYS_LSEEK, fd, offset, whence);
+}
+
+int host_ioctl(int fd, int request, unsigned long arg)
+{
+  return -ENOSYS;
+}
+
+void host_sync(int fd)
+{
+}
+
+int host_dup(int fd)
+{
+  return -ENOSYS;
+}
+
+int host_fstat(int fd, struct stat *buf)
+{
+  /* XXX determine the size using lseek? */
+
+  memset(buf, 0, sizeof(*buf));
+  buf->st_mode = S_IFREG | 0777;
+  return 0;
+}
+
+int host_ftruncate(int fd, off_t length)
+{
+  return -ENOSYS;
+}
+
+void *host_opendir(const char *name)
+{
+  return NULL;
+}
+
+int host_readdir(void *dirp, struct dirent *entry)
+{
+  return -ENOSYS;
+}
+
+void host_rewinddir(void *dirp)
+{
+}
+
+int host_closedir(void *dirp)
+{
+  return -ENOSYS;
+}
+
+int host_statfs(const char *path, struct statfs *buf)
+{
+  return 0;
+}
+
+int host_unlink(const char *pathname)
+{
+  return -ENOSYS;
+}
+
+int host_mkdir(const char *pathname, mode_t mode)
+{
+  return -ENOSYS;
+}
+
+int host_rmdir(const char *pathname)
+{
+  return host_unlink(pathname);
+}
+
+int host_rename(const char *oldpath, const char *newpath)
+{
+  return -ENOSYS;
+}
+
+int host_stat(const char *path, struct stat *buf)
+{
+  int ret = host_open(path, O_RDONLY, 0);
+  if (ret >= 0)
+    {
+      int fd = ret;
+      ret = host_fstat(fd, buf);
+      host_close(fd);
+    }
+
+  if (ret < 0)
+    {
+      /* Since semihosting doesn't support directory yet,
+       * we have to assume it's a directory here.
+       */
+
+      ret = 0;
+      memset(buf, 0, sizeof(*buf));
+      buf->st_mode = S_IFDIR | 0777;
+    }
+
+  return ret;
+}

arch/xtensa/src/esp32/Make.defs

@@ -72,6 +72,11 @@ ifeq ($(CONFIG_STACK_COLORATION),y)
   CMN_CSRCS += xtensa_checkstack.c
 endif
 
+ifeq ($(CONFIG_FS_HOSTFS),y)
+  CMN_ASRCS += xtensa_simcall.S
+  CMN_CSRCS += xtensa_hostfs.c
+endif
+
 
 # Use of common/xtensa_etherstub.c is deprecated.  The preferred mechanism
 # is to use CONFIG_NETDEV_LATEINIT=y to suppress the call to