1 /* 2 * Copyright (c) 2020 Intel Corporation 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #include <zephyr/kernel.h> 8 #include <zephyr/kernel_structs.h> 9 #include <kernel_internal.h> 10 #include <kernel_tls.h> 11 #include <zephyr/app_memory/app_memdomain.h> 12 #include <zephyr/sys/util.h> 13 arch_tls_stack_setup(struct k_thread * new_thread,char * stack_ptr)14size_t arch_tls_stack_setup(struct k_thread *new_thread, char *stack_ptr) 15 { 16 /* 17 * TLS area for ARM has some data fields following by 18 * thread data and bss. These fields are supposed to be 19 * used by toolchain and OS TLS code to aid in locating 20 * the TLS data/bss. Zephyr currently has no use for 21 * this so we can simply skip these. However, since GCC 22 * is generating code assuming these fields are there, 23 * we simply skip them when setting the TLS pointer. 24 */ 25 26 /* 27 * Since we are populating things backwards, 28 * setup the TLS data/bss area first. 29 */ 30 stack_ptr -= z_tls_data_size(); 31 z_tls_copy(stack_ptr); 32 33 /* Skip two pointers due to toolchain */ 34 stack_ptr -= sizeof(uintptr_t) * 2; 35 36 /* 37 * Set thread TLS pointer which is used in 38 * context switch to point to TLS area. 39 */ 40 new_thread->tls = POINTER_TO_UINT(stack_ptr); 41 42 return (z_tls_data_size() + (sizeof(uintptr_t) * 2)); 43 } 44
