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, 95 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/i386/memcpy.S b/REORG.TODO/sysdeps/i386/memcpy.S
new file mode 100644
index 0000000000..06568ea724
--- /dev/null
+++ b/REORG.TODO/sysdeps/i386/memcpy.S
@@ -0,0 +1,95 @@
+/* memcpy with REP MOVSB/STOSB
+   Copyright (C) 2015-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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>
+#include "asm-syntax.h"
+
+#ifndef MEMCPY
+# define MEMCPY		memcpy
+# define MEMCPY_CHK	__memcpy_chk
+#endif
+
+#ifdef USE_AS_BCOPY
+# define STR2		12
+# define STR1		STR2+4
+# define N     		STR1+4
+#else
+# define STR1		12
+# define STR2		STR1+4
+# define N     		STR2+4
+#endif
+
+#define CFI_PUSH(REG)						\
+  cfi_adjust_cfa_offset (4);					\
+  cfi_rel_offset (REG, 0)
+
+#define CFI_POP(REG)						\
+  cfi_adjust_cfa_offset (-4);					\
+  cfi_restore (REG)
+
+#define PUSH(REG)	pushl REG; CFI_PUSH (REG)
+#define POP(REG)	popl REG; CFI_POP (REG)
+
+	.text
+#if defined SHARED && IS_IN (libc) && !defined USE_AS_BCOPY
+ENTRY (MEMCPY_CHK)
+	movl	12(%esp), %eax
+	cmpl	%eax, 16(%esp)
+	jb	HIDDEN_JUMPTARGET (__chk_fail)
+END (MEMCPY_CHK)
+#endif
+ENTRY (MEMCPY)
+	PUSH	(%esi)
+	PUSH	(%edi)
+	movl	N(%esp), %ecx
+	movl	STR1(%esp), %edi
+	movl	STR2(%esp), %esi
+	mov	%edi, %eax
+#ifdef USE_AS_MEMPCPY
+	add	%ecx, %eax
+#endif
+
+#ifdef USE_AS_MEMMOVE
+	cmp	%esi, %edi
+	ja	L(copy_backward)
+	je	L(bwd_write_0bytes)
+#endif
+
+	rep	movsb
+	POP	(%edi)
+	POP	(%esi)
+	ret
+
+#ifdef USE_AS_MEMMOVE
+L(copy_backward):
+	lea	-1(%edi,%ecx), %edi
+	lea	-1(%esi,%ecx), %esi
+	std
+	rep	movsb
+	cld
+L(bwd_write_0bytes):
+	POP	(%edi)
+	POP	(%esi)
+	ret
+#endif
+
+END (MEMCPY)
+
+#ifndef USE_AS_BCOPY
+libc_hidden_builtin_def (MEMCPY)
+#endif