108 lines
4.0 KiB
C
108 lines
4.0 KiB
C
/****************************************************************************
|
|
* arch/arm/include/tls.h
|
|
*
|
|
* 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __ARCH_ARM_INCLUDE_TLS_H
|
|
#define __ARCH_ARM_INCLUDE_TLS_H 1
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <assert.h>
|
|
#include <nuttx/arch.h>
|
|
#include <nuttx/tls.h>
|
|
|
|
#ifdef CONFIG_TLS
|
|
|
|
/****************************************************************************
|
|
* Inline Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: up_getsp
|
|
****************************************************************************/
|
|
|
|
/* I don't know if the builtin to get SP is enabled */
|
|
|
|
static inline uint32_t up_getsp(void)
|
|
{
|
|
uint32_t sp;
|
|
__asm__
|
|
(
|
|
"\tmov %0, sp\n\t"
|
|
: "=r"(sp)
|
|
);
|
|
|
|
return sp;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: up_tls_info
|
|
*
|
|
* Description:
|
|
* Return the TLS information structure for the currently executing thread.
|
|
* When TLS is enabled, up_createstack() will align allocated stacks to
|
|
* the TLS_STACK_ALIGN value. An instance of the following structure will
|
|
* be implicitly positioned at the "lower" end of the stack. Assuming a
|
|
* "push down" stack, this is at the "far" end of the stack (and can be
|
|
* clobbered if the stack overflows).
|
|
*
|
|
* If an MCU has a "push up" then that TLS structure will lie at the top
|
|
* of the stack and stack allocation and initialization logic must take
|
|
* care to preserve this structure content.
|
|
*
|
|
* The stack memory is fully accessible to user mode threads.
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* A pointer to TLS info structure at the beginning of the STACK memory
|
|
* allocation. This is essentially an application of the TLS_INFO(sp)
|
|
* macro and has a platform dependency only in the manner in which the
|
|
* stack pointer (sp) is obtained and interpreted.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static inline FAR struct tls_info_s *up_tls_info(void)
|
|
{
|
|
DEBUGASSERT(!up_interrupt_context());
|
|
return TLS_INFO((uintptr_t)up_getsp());
|
|
}
|
|
|
|
#endif /* CONFIG_TLS */
|
|
#endif /* __ARCH_ARM_INCLUDE_TLS_H */
|