[newlib-cygwin] aarch64: support binary mode for opening files

[Richard Earnshaw <rearnsha@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=2a3a03972b35377aef8d3d52d873ac3b8fcc512c

commit 2a3a03972b35377aef8d3d52d873ac3b8fcc512c
Author: Richard Earnshaw <rearnsha@arm.com>
Date:   Wed May 26 15:17:11 2021 +0100

    aarch64: support binary mode for opening files
    
    Newlib for aarch64 uses libgloss for the backend.  One common libgloss
    implementation is the 'rdimon' implementation, which uses the Arm
    Semihosting protocol.  In order to support a remote host that runs on
    Windows we need to know whether a file is to be opened in binary or
    text mode.  That means that we need to preserve this information via
    O_BINARY until we know what the libgloss binding will be.
    
    This patch simply copies the arm implementation from sys/arm/sys and
    puts it in machine/aarch64/sys, because we don't have a 'sys' subtree
    on aarch64.

Diff:
---
 newlib/libc/machine/aarch64/sys/fcntl.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/newlib/libc/machine/aarch64/sys/fcntl.h b/newlib/libc/machine/aarch64/sys/fcntl.h
new file mode 100644
index 000000000..7da1d46da
--- /dev/null
+++ b/newlib/libc/machine/aarch64/sys/fcntl.h
@@ -0,0 +1,12 @@
+#ifndef _SYS_FCNTL_H_
+#define _SYS_FCNTL_H_
+
+#include <sys/_default_fcntl.h>
+
+/* We want to support O_BINARY for the open syscall.
+   For example, the Demon debug monitor has a separate
+   flag value for "rb" vs "r". */
+#define _FBINARY        0x10000
+#define O_BINARY        _FBINARY
+
+#endif /* _SYS_FCNTL_H_ */