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53 lines
1.4 KiB
53 lines
1.4 KiB
/* |
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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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