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99e5e16c5c
(__ASSUME_SIGFRAME_V2): Define for 2.6.18 and later. * sysdeps/unix/sysv/linux/arm/eabi/sigrestorer.S (__default_sa_restorer): Rename to __default_sa_restorer_v1. Don't define if __ASSUME_SIGFRAME_V2. (__default_rt_sa_restorer): Rename to __default_rt_sa_restorer_v1. Don't define if __ASSUME_SIGFRAME_V2. (__default_sa_restorer_v2, __default_rt_sa_restorer_v2): New. * sysdeps/unix/sysv/linux/arm/nptl/Versions (__default_sa_restorer_v1, __default_rt_sa_restorer_v1, __default_sa_restorer_v2, __default_rt_sa_restorer_v2): Add to GLIBC_PRIVATE. * sysdeps/unix/sysv/linux/arm/sigaction.c [__ARM_EABI__] (__default_sa_restorer_v1, __default_sa_restorer_v2, __default_rt_sa_restorer_v1, __default_rt_sa_restorer_v2): Declare. (__default_sa_restorer, __default_rt_sa_restorer): Define as macros depending on kernel version.
80 lines
2.2 KiB
ArmAsm
80 lines
2.2 KiB
ArmAsm
/* Copyright (C) 1999, 2005 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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Because the signal frame layout changed in 2.6.18, we provide two
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copies of these functions with different unwind information. */
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#ifndef __ASSUME_SIGFRAME_V2
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.fnstart
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.save {r0-r15}
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.pad #12
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nop
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ENTRY(__default_sa_restorer_v1)
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mov r7, $SYS_ify(sigreturn)
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swi 0x0
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.fnend
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#endif
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.fnstart
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.save {r0-r15}
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.pad #32
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nop
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ENTRY(__default_sa_restorer_v2)
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mov r7, $SYS_ify(sigreturn)
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swi 0x0
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.fnend
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#ifdef __NR_rt_sigreturn
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#ifndef __ASSUME_SIGFRAME_V2
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.fnstart
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.save {r0-r15}
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.pad #168
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nop
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ENTRY(__default_rt_sa_restorer_v1)
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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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#endif
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.fnstart
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.save {r0-r15}
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.pad #160
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nop
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ENTRY(__default_rt_sa_restorer_v2)
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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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#endif
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