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 14 #if XCHAL_HAVE_THREADPTR == 0 15 #error SoC does not support THREADPTR for thread local storage. 16 #endif 17 arch_tls_stack_setup(struct k_thread * new_thread,char * stack_ptr)18size_t arch_tls_stack_setup(struct k_thread *new_thread, char *stack_ptr) 19 { 20 /* 21 * TLS area has some data fields following by 22 * thread data and bss. These fields are supposed to be 23 * used by toolchain and OS TLS code to aid in locating 24 * the TLS data/bss. Zephyr currently has no use for 25 * this so we can simply skip these. However, since GCC 26 * is generating code assuming these fields are there, 27 * we simply skip them when setting the TLS pointer. 28 */ 29 30 /* 31 * Since we are populating things backwards, 32 * setup the TLS data/bss area first. 33 */ 34 stack_ptr -= z_tls_data_size(); 35 z_tls_copy(stack_ptr); 36 37 /* Skip two pointers due to toolchain */ 38 stack_ptr -= sizeof(uintptr_t) * 2; 39 40 /* 41 * Set thread TLS pointer which is used in 42 * context switch to point to TLS area. 43 */ 44 new_thread->tls = POINTER_TO_UINT(stack_ptr); 45 46 return (z_tls_data_size() + (sizeof(uintptr_t) * 2)); 47 } 48
