48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
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* Copyright (c) 2020 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <kernel_structs.h>
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#include <kernel_internal.h>
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#include <kernel_tls.h>
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#include <app_memory/app_memdomain.h>
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#include <sys/util.h>
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#if XCHAL_HAVE_THREADPTR == 0
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#error SoC does not support THREADPTR for thread local storage.
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#endif
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size_t arch_tls_stack_setup(struct k_thread *new_thread, char *stack_ptr)
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{
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/*
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* TLS area has some data fields following by
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* thread data and bss. These fields are supposed to be
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* used by toolchain and OS TLS code to aid in locating
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* the TLS data/bss. Zephyr currently has no use for
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* this so we can simply skip these. However, since GCC
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* is generating code assuming these fields are there,
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* we simply skip them when setting the TLS pointer.
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*/
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/*
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* Since we are populating things backwards,
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* setup the TLS data/bss area first.
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*/
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stack_ptr -= z_tls_data_size();
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z_tls_copy(stack_ptr);
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/* Skip two pointers due to toolchain */
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stack_ptr -= sizeof(uintptr_t) * 2;
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/*
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* Set thread TLS pointer which is used in
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* context switch to point to TLS area.
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*/
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new_thread->tls = POINTER_TO_UINT(stack_ptr);
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return (z_tls_data_size() + (sizeof(uintptr_t) * 2));
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}
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