fbf05db906
Summary: - In case of BUILD_KERNEL, NuttX uses USR mode sp and SVC mode sp. - The kernel runs on SVC mode sp. - While the kernel is running, up_getsp() cannot get the TLS address. - The kernel requires tls_get_info() function. - For the user land, up_getsp() can be used. - tls_getinfo.c is always compiled and tls_get_info() function is filtered by macros in the tls_getinfo.c. Impact: BUILD_KERNEL Testing: test program on custom Cortex-A9 board (BUILD_KERNEL) ostest on sabre-6quad:smp (QEMU, BUILD_FLAT) Signed-off-by: Oki Minabe <minabe.oki@gmail.com>
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/****************************************************************************
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* libs/libc/tls/tls_getinfo.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <stdint.h>
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#include <assert.h>
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#include <nuttx/arch.h>
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#include <nuttx/tls.h>
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#if !defined(CONFIG_TLS_ALIGNED) || defined(__KERNEL__)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tls_get_info
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*
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* Description:
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* Return a reference to the tls_info_s structure. This is used as part
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* of the internal implementation of tls_get/set_elem() and ONLY for the
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* where CONFIG_TLS_ALIGNED is *not* defined or __KERNEL__ is defined.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* A reference to the thread-specific tls_info_s structure is return on
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* success. NULL would be returned in the event of any failure.
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*
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****************************************************************************/
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FAR struct tls_info_s *tls_get_info(void)
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{
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FAR struct tls_info_s *info = NULL;
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struct stackinfo_s stackinfo;
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int ret;
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ret = nxsched_get_stackinfo(0, &stackinfo);
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if (ret >= 0)
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{
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/* The TLS data lies at the lowest address of the stack allocation.
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* This is true for both push-up and push-down stacks.
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*/
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info = (FAR struct tls_info_s *)stackinfo.stack_alloc_ptr;
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}
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return info;
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}
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#endif /* !CONFIG_TLS_ALIGNED || __KERNEL__ */
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