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, 111 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/arm/setcontext.S b/REORG.TODO/sysdeps/unix/sysv/linux/arm/setcontext.S
new file mode 100644
index 0000000000..db6aebfbd4
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/arm/setcontext.S
@@ -0,0 +1,111 @@
+/* Copyright (C) 2012-2017 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/>.  */
+
+/* ??? Needs more rearrangement for the LDM to handle thumb mode.  */
+#define NO_THUMB
+#include <sysdep.h>
+#include <rtld-global-offsets.h>
+
+#include "ucontext_i.h"
+
+	.syntax unified
+	.text
+
+/* int setcontext (const ucontext_t *ucp) */
+
+ENTRY(__setcontext)
+	mov	r4, r0
+	add	r0, r0, #UCONTEXT_REGSPACE
+
+	/* Restore the VFP registers.  Copied from arm/__longjmp.S.  */
+#ifdef PIC
+	ldr     r2, 1f
+	ldr     r1, .Lrtld_global_ro
+0:      add     r2, pc, r2
+	ldr     r2, [r2, r1]
+	ldr     r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
+#else
+	ldr     r2, .Lhwcap
+	ldr     r2, [r2, #0]
+#endif
+
+#ifdef __SOFTFP__
+	tst     r2, #HWCAP_ARM_VFP
+	beq     .Lno_vfp_sc
+#endif
+
+	/* Following instruction is vldmia r0!, {d8-d15}.  */
+	ldc     p11, cr8, [r0], #64
+	/* Restore the floating-point status register.  */
+	ldr     r1, [r0], #4
+	/* Following instruction is fmxr fpscr, r1.  */
+	mcr     p10, 7, r1, cr1, cr0, 0
+.Lno_vfp_sc:
+	tst     r2, #HWCAP_ARM_IWMMXT
+	beq     .Lno_iwmmxt_sc
+
+	/* Restore the call-preserved iWMMXt registers.  */
+	/* Following instructions are wldrd wr10, [r0], #8 (etc.)  */
+	ldcl    p1, cr10, [r0], #8
+	ldcl    p1, cr11, [r0], #8
+	ldcl    p1, cr12, [r0], #8
+	ldcl    p1, cr13, [r0], #8
+	ldcl    p1, cr14, [r0], #8
+	ldcl    p1, cr15, [r0], #8
+.Lno_iwmmxt_sc:
+
+	/* Now bring back the signal status.  */
+	mov	r0, #SIG_SETMASK
+	add	r1, r4, #UCONTEXT_SIGMASK
+	mov	r2, #0
+	bl	PLTJMP(__sigprocmask)
+
+	/* Loading r0-r3 makes makecontext easier.  */
+	add     r14, r4, #MCONTEXT_ARM_R0
+	ldmia   r14, {r0-r12}
+	ldr     r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
+	add     r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
+	ldmia   r14, {r14, pc}
+
+END(setcontext)
+weak_alias(__setcontext, setcontext)
+
+	/* Called when a makecontext() context returns.  Start the
+	   context in R4 or fall through to exit().  */
+	/* Unwind descriptors are looked up based on PC - 2, so we have to
+	   make sure to mark the instruction preceding the __startcontext
+	   label as .cantunwind.  */
+	.fnstart
+	.cantunwind
+	nop
+ENTRY(__startcontext)
+	movs    r0, r4
+	bne     PLTJMP(__setcontext)
+
+	@ New context was 0 - exit
+	b       PLTJMP(HIDDEN_JUMPTARGET(exit))
+	.fnend
+END(__startcontext)
+
+#ifdef PIC
+1:      .long   _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
+.Lrtld_global_ro:
+	.long   C_SYMBOL_NAME(_rtld_global_ro)(GOT)
+#else
+.Lhwcap:
+	.long   C_SYMBOL_NAME(_dl_hwcap)
+#endif