blob: 9b731286c7da854733c92ca41fca1649620d1d92 [file] [log] [blame]
* Copyright (c) 2020 Intel Corporation
* SPDX-License-Identifier: Apache-2.0
#include <zephyr/kernel.h>
#include <zephyr/kernel_structs.h>
#include <kernel_internal.h>
#include <kernel_tls.h>
#include <zephyr/app_memory/app_memdomain.h>
#include <zephyr/sys/util.h>
* Since Cortex-M does not have the thread ID or process ID
* register needed to store TLS pointer at runtime for
* toolchain to access thread data. Use a global variable
* instead.
K_APP_DMEM(z_libc_partition) uintptr_t z_arm_tls_ptr;
size_t arch_tls_stack_setup(struct k_thread *new_thread, char *stack_ptr)
* TLS area for ARM has some data fields following by
* thread data and bss. These fields are supposed to be
* used by toolchain and OS TLS code to aid in locating
* the TLS data/bss. Zephyr currently has no use for
* this so we can simply skip these. However, since GCC
* is generating code assuming these fields are there,
* we simply skip them when setting the TLS pointer.
* Since we are populating things backwards,
* setup the TLS data/bss area first.
stack_ptr -= z_tls_data_size();
/* Skip two pointers due to toolchain */
stack_ptr -= sizeof(uintptr_t) * 2;
* Set thread TLS pointer which is used in
* context switch to point to TLS area.
new_thread->tls = POINTER_TO_UINT(stack_ptr);
return (z_tls_data_size() + (sizeof(uintptr_t) * 2));