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, 130 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/setcontext.S b/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/setcontext.S
new file mode 100644
index 0000000000..3a82926ad3
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/setcontext.S
@@ -0,0 +1,130 @@
+/* Set current context.
+
+   Copyright (C) 2009-2017 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 "ucontext_i.h"
+#include "ucontext-internal.h"
+
+/*  int __setcontext (const ucontext_t *ucp)
+
+  Restores the machine context in UCP and thereby resumes execution
+  in that context.
+
+  This implementation is intended to be used for *synchronous* context
+  switches only.  Therefore, it does not have to restore anything
+  other than the PRESERVED state.  */
+
+	.text
+
+ENTRY (__setcontext)
+	DELOUSE (0)
+	/* Save a copy of UCP.  */
+	mov	x9, x0
+
+	/* Set the signal mask with
+	   rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8).  */
+	mov	x0, #SIG_SETMASK
+	add	x1, x9, #UCONTEXT_SIGMASK
+	mov	x2, #0
+	mov	x3, #_NSIG8
+	mov	x8, SYS_ify (rt_sigprocmask)
+	svc	0
+	cbz	x0, 1f
+	b	C_SYMBOL_NAME (__syscall_error)
+1:
+	/* Restore the general purpose registers.  */
+	mov	x0, x9
+	cfi_def_cfa (x0, 0)
+	cfi_offset (x18, oX0 + 18 * SZREG)
+	cfi_offset (x19, oX0 + 19 * SZREG)
+	cfi_offset (x20, oX0 + 20 * SZREG)
+	cfi_offset (x21, oX0 + 21 * SZREG)
+	cfi_offset (x22, oX0 + 22 * SZREG)
+	cfi_offset (x23, oX0 + 23 * SZREG)
+	cfi_offset (x24, oX0 + 24 * SZREG)
+	cfi_offset (x25, oX0 + 25 * SZREG)
+	cfi_offset (x26, oX0 + 26 * SZREG)
+	cfi_offset (x27, oX0 + 27 * SZREG)
+	cfi_offset (x28, oX0 + 28 * SZREG)
+	cfi_offset (x29, oX0 + 29 * SZREG)
+	cfi_offset (x30, oX0 + 30 * SZREG)
+
+	cfi_offset ( d8, oV0 + 8 * SZVREG)
+	cfi_offset ( d9, oV0 + 9 * SZVREG)
+	cfi_offset (d10, oV0 + 10 * SZVREG)
+	cfi_offset (d11, oV0 + 11 * SZVREG)
+	cfi_offset (d12, oV0 + 12 * SZVREG)
+	cfi_offset (d13, oV0 + 13 * SZVREG)
+	cfi_offset (d14, oV0 + 14 * SZVREG)
+	cfi_offset (d15, oV0 + 15 * SZVREG)
+	ldp	x18, x19, [x0, oX0 + 18 * SZREG]
+	ldp	x20, x21, [x0, oX0 + 20 * SZREG]
+	ldp	x22, x23, [x0, oX0 + 22 * SZREG]
+	ldp	x24, x25, [x0, oX0 + 24 * SZREG]
+	ldp	x26, x27, [x0, oX0 + 26 * SZREG]
+	ldp	x28, x29, [x0, oX0 + 28 * SZREG]
+	ldr     x30,      [x0, oX0 + 30 * SZREG]
+	ldr     x2, [x0, oSP]
+	mov	sp, x2
+
+	/* Check for FP SIMD context.  We don't support restoring
+	   contexts created by the kernel, so this context must have
+	   been created by getcontext.  Hence we can rely on the
+	   first extension block being the FP SIMD context.  */
+	add     x2, x0, #oEXTENSION
+
+	mov	w3, #(FPSIMD_MAGIC & 0xffff)
+	movk	w3, #(FPSIMD_MAGIC >> 16), lsl #16
+	ldr	w1, [x2, #oHEAD + oMAGIC]
+	cmp	w1, w3
+	b.ne	2f
+
+	/* Restore the FP SIMD context.  */
+	add	x3, x2, #oV0 + 8 * SZVREG
+	ldp	 q8,  q9, [x3], #2 * SZVREG
+	ldp	q10, q11, [x3], #2 * SZVREG
+	ldp	q12, q13, [x3], #2 * SZVREG
+	ldp	q14, q15, [x3], #2 * SZVREG
+
+	add	x3, x2, oFPSR
+
+	ldr	w4, [x3]
+	msr	fpsr, x4
+
+	ldr	w4, [x3, oFPCR - oFPSR]
+	msr	fpcr, x4
+
+2:
+	ldr     x16, [x0, oPC]
+	/* Restore arg registers.  */
+	ldp	x2, x3, [x0, oX0 + 2 * SZREG]
+	ldp	x4, x5, [x0, oX0 + 4 * SZREG]
+	ldp	x6, x7, [x0, oX0 + 6 * SZREG]
+	ldp	x0, x1, [x0, oX0 + 0 * SZREG]
+	/* Jump to the new pc value.  */
+	br	x16
+PSEUDO_END (__setcontext)
+weak_alias (__setcontext, setcontext)
+
+ENTRY (__startcontext)
+	mov	x0, x19
+	cbnz	x0, __setcontext
+1:	b       HIDDEN_JUMPTARGET (exit)
+END (__startcontext)