/* Copyright (C) 1999-2018 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>

/* If no SA_RESTORER function was specified by the application we use

   one of these.  This avoids the need for the kernel to synthesise a return

   instruction on the stack, which would involve expensive cache flushes.

   Nowadays (2.6 series, and somewhat earlier) the kernel uses a high page

   for signal trampolines, so the cache flushes are not an issue.  But since

   we do not have a vDSO, continue to use these so that we can provide

   unwind information.

   Start the unwind tables at least one instruction before the signal

   trampoline, because the unwinder will assume we are returning after

   a call site.  */

/* Used in ENTRY.  */

#undef cfi_startproc

#define cfi_startproc \

	.cfi_startproc simple; \

	.cfi_signal_frame

/* The CFA is not computed / used correctly here; this is neither trivial to

   do, nor is it needed.  */

#define CFI \

	cfi_def_cfa (sp, 0); \

	cfi_offset (r0, OFFSET + 0 * 4); \

	cfi_offset (r1, OFFSET + 1 * 4); \

	cfi_offset (r2, OFFSET + 2 * 4); \

	cfi_offset (r3, OFFSET + 3 * 4); \

	cfi_offset (r4, OFFSET + 4 * 4); \

	cfi_offset (r5, OFFSET + 5 * 4); \

	cfi_offset (r6, OFFSET + 6 * 4); \

	cfi_offset (r7, OFFSET + 7 * 4); \

	cfi_offset (r8, OFFSET + 8 * 4); \

	cfi_offset (r9, OFFSET + 9 * 4); \

	cfi_offset (r10, OFFSET + 10 * 4); \

	cfi_offset (r11, OFFSET + 11 * 4); \

	cfi_offset (r12, OFFSET + 12 * 4); \

	cfi_offset (r13, OFFSET + 13 * 4); \

	cfi_offset (r14, OFFSET + 14 * 4); \

	cfi_offset (r15, OFFSET + 15 * 4)

#define OFFSET 32

	.fnstart

	.save {r0-r15}

	.pad #OFFSET

	nop

ENTRY(__default_sa_restorer)

	CFI

	mov	r7, $SYS_ify(sigreturn)

	swi	0x0

	.fnend

END(__default_sa_restorer)

#undef OFFSET

#define OFFSET 160

	.fnstart

	.save {r0-r15}

	.pad #OFFSET

	nop

ENTRY(__default_rt_sa_restorer)

	CFI

	mov	r7, $SYS_ify(rt_sigreturn)

	swi	0x0

	.fnend

END(__default_rt_sa_restorer)

#undef OFFSET