3e7db57403
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5778 42af7a65-404d-4744-a932-0658087f49c3
116 lines
4.0 KiB
ArmAsm
116 lines
4.0 KiB
ArmAsm
/****************************************************************************
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* arch/arm/srcm/armv6-m/up_signal_handler.S
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <arch/syscall.h>
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#if defined(CONFIG_NUTTX_KERNEL) && !defined(__KERNEL__)
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/****************************************************************************
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* File info
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****************************************************************************/
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.cpu cortex-m0
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.file "up_signal_handler.S"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_signal_handler
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*
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* Description:
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* This function is the user-space, signal handler trampoline function. It
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* is called from up_signal_dispatch() in user-mode.
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*
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* Inputs:
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* R0 = sighand
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* The address user-space signal handling function
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* R1-R3 = signo, info, and ucontext
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* Standard arguments to be passed to the signal handling function.
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*
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* Return:
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* None. This function does not return in the normal sense. It returns
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* via the SYS_signal_handler_return (see svcall.h)
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*
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****************************************************************************/
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.text
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.align 2
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.code 16
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.thumb_func
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.globl up_signal_handler
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.type up_signal_handler, function
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up_signal_handler:
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/* Save some register */
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push {r4, r5 /* Save R4 and R5 on the stack */
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mov r5, lr /* Save LR in R5 */
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/* Call the signal handler */
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mov r4, r0 /* R4=sighand */
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mov r0, r1 /* R0=signo */
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mov r1, r2 /* R1=info */
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mov r2, r3 /* R2=ucontext */
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blx r4 /* Call the signal handler */
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/* Restore the registers */
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mov lr, r5 /* Restore LR */
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pop {r4, r5} /* Restore R4 and R5 */
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/* Execute the SYS_signal_handler_return SVCall (will not return) */
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mov r0, #SYS_signal_handler_return
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svc 0
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nop
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.size up_signal_handler, .-up_signal_handler
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.end
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#endif /* CONFIG_NUTTX_KERNEL && !__KERNEL__ */
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