RISC-V: Add semihosting support

1 files changed, 36 insertions, 0 deletions

diff --git a/libgloss/riscv/semihost-sys_stat_common.c b/libgloss/riscv/semihost-sys_stat_common.c
new file mode 100644
index 000000000..b38eb0863
--- /dev/null
+++ b/libgloss/riscv/semihost-sys_stat_common.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2020 Embecosm Limited
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include <machine/syscall.h>
+#include "semihost_syscall.h"
+#include <sys/stat.h>
+#include "semihost_fdtable.h"
+
+/* Used by _fstat and _stat to fill in some common details.  */
+
+int
+__stat_common (int file, struct stat *st)
+{
+  int flen;
+  struct fdentry *fd =__get_fdentry (file);
+  long data_block[1];
+
+  if (fd == NULL)
+    return -1;
+
+  data_block[0] = fd->handle;
+
+  /* Assume character device and default block size of 4096.  */
+  st->st_mode |= S_IFCHR;
+  st->st_blksize = 4096;
+
+  /* Attempt to get length of file.  */
+  flen = syscall_errno (SEMIHOST_flen, data_block);
+  if (flen == -1)
+    return -1;
+
+  st->st_size = flen;
+
+  return 0;
+}