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- /* Copyright (C) 1999 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #include <sys/syscall.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. */
- .global __default_sa_restorer
- .type __default_sa_restorer,%function
- .align 2
- #ifdef __ARM_EABI__
- .fnstart
- .save {r0-r15}
- .pad #12
- nop
- __default_sa_restorer:
- mov r7, $SYS_ify(sigreturn)
- swi 0x0
- .fnend
- #else
- __default_sa_restorer:
- DO_CALL (sigreturn)
- #endif
- #ifdef __NR_rt_sigreturn
- .global __default_rt_sa_restorer
- .type __default_rt_sa_restorer,%function
- .align 2
- #ifdef __ARM_EABI__
- .fnstart
- .save {r0-r15}
- .pad #168
- nop
- __default_rt_sa_restorer:
- mov r7, $SYS_ify(rt_sigreturn)
- swi 0x0
- .fnend
- #else
- __default_rt_sa_restorer:
- DO_CALL (rt_sigreturn)
- #endif
- #endif
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