nuttx/arch/xtensa/src/common/xtensa_sigtramp.S

84 lines
3.2 KiB
ArmAsm

/****************************************************************************
* arch/xtensa/src/common/xtensa_sigtramp.S
*
* Adapted from use in NuttX by:
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
.file "xtensa_sigtramp.S"
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include "xtensa_abi.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: _xtensa_sig_trampoline
*
* Description:
* Just sets up a proper window call to xtensa_sig_deliver(). We get
* here via a context switch setup in up_schedule_signaction. Which
* re-vectors the context switch to this location.
*
* Here we just call xtensa_sig_deliver() using the proper ABI. NOTE
* that this function cannot return and depends on the fact that
* xtensa_sig_deliver() does not return.
*
*
****************************************************************************/
.text
.global _xtensa_sig_trampoline
.type _xtensa_sig_trampoline, @function
.align 4
_xtensa_sig_trampoline:
ENTRY(16) /* REVISIT: This should not be here */
#ifdef __XTENSA_CALL0_ABI__
cali0 xtensa_sig_deliver /* Call xtensa_sig_deliver */
#else
call4 xtensa_sig_deliver /* Call xtensa_sig_deliver */
#endif
1: j 1b /* xtensa_sig_deliver does not return */
.size _xtensa_sig_trampoline, . - _xtensa_sig_trampoline