| /* |
| * 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/sys/util.h> |
| |
| #ifdef __CCAC__ |
| extern char _arcmwdt_tls_start[]; |
| extern char _arcmwdt_tls_size[]; |
| |
| size_t arch_tls_stack_setup(struct k_thread *new_thread, char *stack_ptr) |
| { |
| size_t tls_size = (size_t)_arcmwdt_tls_size; |
| size_t tls_size_aligned = ROUND_UP(tls_size, ARCH_STACK_PTR_ALIGN); |
| |
| stack_ptr -= tls_size_aligned; |
| memcpy(stack_ptr, _arcmwdt_tls_start, tls_size); |
| |
| new_thread->tls = POINTER_TO_UINT(stack_ptr); |
| |
| return tls_size_aligned; |
| } |
| |
| void *_Preserve_flags _mwget_tls(void) |
| { |
| return (void *)(_current->tls); |
| } |
| |
| #else |
| size_t arch_tls_stack_setup(struct k_thread *new_thread, char *stack_ptr) |
| { |
| /* |
| * TLS area for ARC 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(); |
| z_tls_copy(stack_ptr); |
| |
| /* 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)); |
| } |
| #endif |