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85 lines
2.6 KiB
ArmAsm
85 lines
2.6 KiB
ArmAsm
/* Copyright (C) 1999-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* If no SA_RESTORER function was specified by the application we use
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one of these. This avoids the need for the kernel to synthesise a return
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instruction on the stack, which would involve expensive cache flushes.
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Nowadays (2.6 series, and somewhat earlier) the kernel uses a high page
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for signal trampolines, so the cache flushes are not an issue. But since
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we do not have a vDSO, continue to use these so that we can provide
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unwind information.
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Start the unwind tables at least one instruction before the signal
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trampoline, because the unwinder will assume we are returning after
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a call site. */
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/* Used in ENTRY. */
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#undef cfi_startproc
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#define cfi_startproc \
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.cfi_startproc simple; \
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.cfi_signal_frame
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/* The CFA is not computed / used correctly here; this is neither trivial to
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do, nor is it needed. */
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#define CFI \
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cfi_def_cfa (sp, 0); \
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cfi_offset (r0, OFFSET + 0 * 4); \
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cfi_offset (r1, OFFSET + 1 * 4); \
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cfi_offset (r2, OFFSET + 2 * 4); \
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cfi_offset (r3, OFFSET + 3 * 4); \
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cfi_offset (r4, OFFSET + 4 * 4); \
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cfi_offset (r5, OFFSET + 5 * 4); \
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cfi_offset (r6, OFFSET + 6 * 4); \
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cfi_offset (r7, OFFSET + 7 * 4); \
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cfi_offset (r8, OFFSET + 8 * 4); \
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cfi_offset (r9, OFFSET + 9 * 4); \
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cfi_offset (r10, OFFSET + 10 * 4); \
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cfi_offset (r11, OFFSET + 11 * 4); \
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cfi_offset (r12, OFFSET + 12 * 4); \
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cfi_offset (r13, OFFSET + 13 * 4); \
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cfi_offset (r14, OFFSET + 14 * 4); \
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cfi_offset (r15, OFFSET + 15 * 4)
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#define OFFSET 32
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.fnstart
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.save {r0-r15}
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.pad #OFFSET
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nop
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ENTRY(__default_sa_restorer)
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CFI
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mov r7, $SYS_ify(sigreturn)
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swi 0x0
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.fnend
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END(__default_sa_restorer)
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#undef OFFSET
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#define OFFSET 160
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.fnstart
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.save {r0-r15}
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.pad #OFFSET
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nop
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ENTRY(__default_rt_sa_restorer)
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CFI
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mov r7, $SYS_ify(rt_sigreturn)
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swi 0x0
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.fnend
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END(__default_rt_sa_restorer)
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#undef OFFSET
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