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, 198 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/mips/makecontext.S b/REORG.TODO/sysdeps/unix/sysv/linux/mips/makecontext.S
new file mode 100644
index 0000000000..5c3af04491
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/mips/makecontext.S
@@ -0,0 +1,198 @@
+/* Modify saved context.
+   Copyright (C) 2009-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
+
+   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 <sys/asm.h>
+#include <sys/fpregdef.h>
+#include <sys/regdef.h>
+
+#include "ucontext_i.h"
+
+/* int makecontext (ucontext_t *ucp, (void *func) (), int argc, ...) */
+
+	.text
+	.set	nomips16
+LOCALSZ = 0
+ARGSZ = 0
+MASK = 0x00000000
+#ifdef __PIC__
+LOCALSZ = 1						/* save gp */
+#endif
+#if _MIPS_SIM != _ABIO32
+ARGSZ = 5						/* save a3-a7 */
+# ifdef __PIC__
+MASK = 0x10000000
+# endif
+#endif
+FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
+GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
+#if _MIPS_SIM != _ABIO32
+A3OFF = FRAMESZ - (5 * SZREG)				/* callee-allocated */
+A4OFF = FRAMESZ - (4 * SZREG)
+A5OFF = FRAMESZ - (3 * SZREG)
+A6OFF = FRAMESZ - (2 * SZREG)
+A7OFF = FRAMESZ - (1 * SZREG)
+NARGREGS = 8
+#else
+A3OFF = FRAMESZ + (3 * SZREG)				/* caller-allocated */
+NARGREGS = 4
+#endif
+
+NESTED (__makecontext, FRAMESZ, ra)
+	.mask	MASK, -(ARGSZ * SZREG)
+	.fmask	0x00000000, 0
+
+98:
+#ifdef __PIC__
+	SETUP_GP
+#endif
+
+	PTR_ADDIU sp, -FRAMESZ
+	cfi_adjust_cfa_offset (FRAMESZ)
+
+#ifdef __PIC__
+	SETUP_GP64_STACK (GPOFF, __makecontext)
+	SAVE_GP (GPOFF)
+#endif
+
+#ifdef PROF
+	.set	noat
+	move	AT, ra
+	jal	_mcount
+	.set	at
+#endif
+
+	/* Store args to be passed.  */
+	REG_S	a3, A3OFF(sp)
+#if _MIPS_SIM != _ABIO32
+	REG_S	a4, A4OFF(sp)
+	REG_S	a5, A5OFF(sp)
+	REG_S	a6, A6OFF(sp)
+	REG_S	a7, A7OFF(sp)
+#endif
+
+	/* Store a magic flag.  */
+	li	v1, 1
+	REG_S	v1, (0 * SZREG + MCONTEXT_GREGS)(a0)	/* zero */
+
+	/* Set up the stack.  */
+	PTR_L	t0, STACK_SP(a0)
+	PTR_L	t2, STACK_SIZE(a0)
+	PTR_ADDIU t1, sp, A3OFF
+	PTR_ADDU t0, t2
+	and	t0, ALMASK
+	blez	a2, 2f					/* no arguments */
+
+	/* Store register arguments.  */
+	PTR_ADDIU t2, a0, MCONTEXT_GREGS + 4 * SZREG
+	move	t3, zero
+0:
+	addiu	t3, 1
+	REG_L	v1, (t1)
+	PTR_ADDIU t1, SZREG
+	REG_S	v1, (t2)
+	PTR_ADDIU t2, SZREG
+	bgeu	t3, a2, 2f				/* all done */
+	bltu	t3, NARGREGS, 0b			/* next */
+
+	/* Make room for stack arguments.  */
+	PTR_SUBU t2, a2, t3
+	PTR_SLL	t2, 3
+	PTR_SUBU t0, t2
+	and	t0, ALMASK
+
+	/* Store stack arguments.  */
+	move	t2, t0
+1:
+	addiu	t3, 1
+	REG_L	v1, (t1)
+	PTR_ADDIU t1, SZREG
+	REG_S	v1, (t2)
+	PTR_ADDIU t2, SZREG
+	bltu	t3, a2, 1b				/* next */
+
+2:
+#if _MIPS_SIM == _ABIO32
+	/* Make room for a0-a3 storage.  */
+	PTR_ADDIU t0, -(NARGSAVE * SZREG)
+#endif
+	PTR_L	v1, UCONTEXT_LINK(a0)
+#ifdef __PIC__
+	PTR_ADDIU t9, 99f - 98b
+#else
+	PTR_LA	t9, 99f
+#endif
+	REG_S	t0, (29 * SZREG + MCONTEXT_GREGS)(a0)	/* sp */
+	REG_S	v1, (16 * SZREG + MCONTEXT_GREGS)(a0)	/* s0 */
+#ifdef __PIC__
+	REG_S	gp, (17 * SZREG + MCONTEXT_GREGS)(a0)	/* s1 */
+#endif
+	REG_S	t9, (31 * SZREG + MCONTEXT_GREGS)(a0)	/* ra */
+	REG_S	a1, MCONTEXT_PC(a0)
+
+#ifdef __PIC__
+	RESTORE_GP64_STACK
+	PTR_ADDIU sp, FRAMESZ
+	cfi_adjust_cfa_offset (-FRAMESZ)
+#endif
+	jr	ra
+
+	/* We need to terminate the FDE to stop unwinding if backtrace was
+	   called within a context created by makecontext.  */
+	cfi_endproc
+	nop
+
+99:
+#ifdef __PIC__
+	move	gp, s1
+#endif
+	move	a0, zero
+	beqz	s0, 0f
+
+	/* setcontext (ucp) */
+	move	a0, s0
+#ifdef __PIC__
+	PTR_LA	t9, JUMPTARGET (__setcontext)
+	jalr	t9
+# if _MIPS_SIM == _ABIO32
+	move	gp, s1
+# endif
+#else
+	jal	JUMPTARGET (__setcontext)
+#endif
+	move	a0, v0
+
+0:
+	/* exit (a0) */
+#ifdef __PIC__
+	PTR_LA	t9, HIDDEN_JUMPTARGET (exit)
+	jalr	t9
+#else
+	jal	HIDDEN_JUMPTARGET (exit)
+#endif
+
+	/* You don't exist, you won't feel anything.  */
+1:
+	lb	zero, (zero)
+	b	1b
+
+	cfi_startproc
+PSEUDO_END (__makecontext)
+
+weak_alias (__makecontext, makecontext)