54 lines
1.4 KiB
C
54 lines
1.4 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 <zephyr/kernel.h>
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#include <zephyr/kernel_structs.h>
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#include <kernel_internal.h>
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#include <kernel_tls.h>
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#include <zephyr/app_memory/app_memdomain.h>
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#include <zephyr/sys/util.h>
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#ifdef CONFIG_CPU_CORTEX_M
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/*
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* Since Cortex-M does not have the thread ID or process ID
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* register needed to store TLS pointer at runtime for
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* toolchain to access thread data. Use a global variable
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* instead.
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*/
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K_APP_DMEM(z_libc_partition) uintptr_t z_arm_tls_ptr;
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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 for ARM 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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