Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 70 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/alpha/syscall.S b/REORG.TODO/sysdeps/unix/sysv/linux/alpha/syscall.S
new file mode 100644
index 0000000000..6b082bb489
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/alpha/syscall.S
@@ -0,0 +1,70 @@
+/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David Mosberger <davidm@azstarnet.com>, 1996.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+/*
+ * This is for COMPATIBILITY with Linux/x86 only.  Linux/Alpha system
+ * calls return an error indication in a3.  This allows arbitrary 64bit
+ * values to be returned in v0 (because negative values are not
+ * mistaken as error numbers).  However, C allows only one value to
+ * be returned, so the interface below folds the error indication passed in
+ * a3 back into v0: it sets v0 to -errno if an error occurs.  Thus,
+ * no negative 64bit numbers can be returned.  To avoid this problem,
+ * use assembly stubs wherever possible/convenient.
+ *
+ * Usage:
+ *
+ * long	syscall(syscall_number, arg1, arg2, arg3, arg4, arg5, arg6)
+ *
+ * syscall_number = the index of the system call we're invoking
+ * arg1-arg6 = up to 6 integer arguments to the system call
+ *
+ * We need to do some arg shifting: the kernel expects the
+ * syscall number in v0 and the first six args in a0-a5.
+ *
+ */
+
+
+LEAF(__syscall, 0)
+#ifdef PROF
+	ldgp	gp, 0(pv)
+	.set noat
+	lda	AT, _mcount
+	jsr	AT, (AT), _mcount
+	.set at
+	.prologue 1
+#else
+	.prologue 0
+#endif
+
+	mov	a0, v0		/* Syscall number -> v0 */
+	mov	a1, a0		/* arg1-arg5 -> a0-a4 */
+	mov	a2, a1
+	mov	a3, a2
+	mov	a4, a3
+	mov	a5, a4
+	ldq	a5,0(sp)	/* arg6 -> a5 */
+
+	call_pal PAL_callsys	/* Invoke system call */
+	bne	a3, SYSCALL_ERROR_LABEL
+	ret
+
+PSEUDO_END(__syscall)
+
+weak_alias (__syscall, syscall)