arc: enable thread local storage
This adds the necessary bits to support thread local storage in ARC. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
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parent
d911f99bfc
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c7704d8c66
6 changed files with 79 additions and 1 deletions
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@ -21,6 +21,7 @@ config ARC
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select ARCH_IS_SET
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select HAS_DTS
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imply XIP
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select ARCH_HAS_THREAD_LOCAL_STORAGE
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help
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ARC architecture
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@ -12,4 +12,8 @@ zephyr_cc_option(-fno-delete-null-pointer-checks)
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zephyr_cc_option_ifdef(CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS -munaligned-access)
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# Instruct compiler to use register R26 as thread pointer
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# for thread local storage.
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zephyr_cc_option_ifdef(CONFIG_THREAD_LOCAL_STORAGE -mtp-regno=26)
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add_subdirectory(core)
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@ -32,6 +32,8 @@ zephyr_library_sources_ifdef(CONFIG_USERSPACE userspace.S)
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zephyr_library_sources_ifdef(CONFIG_ARC_CONNECT arc_connect.c)
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zephyr_library_sources_ifdef(CONFIG_ARC_CONNECT arc_smp.c)
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zephyr_library_sources_ifdef(CONFIG_THREAD_LOCAL_STORAGE tls.c)
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add_subdirectory_ifdef(CONFIG_ARC_CORE_MPU mpu)
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add_subdirectory_ifdef(CONFIG_ARC_SECURE_FIRMWARE secureshield)
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@ -108,6 +108,25 @@ static struct init_stack_frame *get_iframe(struct k_thread *thread,
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return Z_STACK_PTR_TO_FRAME(struct init_stack_frame, stack_ptr);
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}
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/*
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* Pre-populate values in the registers inside _callee_saved_stack struct
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* so these registers have pre-defined values when new thread begins
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* execution. For example, setting up the thread pointer for thread local
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* storage here so the thread starts with thread pointer already set up.
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*/
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static inline void arch_setup_callee_saved_regs(struct k_thread *thread,
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uintptr_t stack_ptr)
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{
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_callee_saved_stack_t *regs = UINT_TO_POINTER(stack_ptr);
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ARG_UNUSED(regs);
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#ifdef CONFIG_THREAD_LOCAL_STORAGE
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/* R26 is used for thread pointer */
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regs->r26 = thread->tls;
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#endif
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}
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/*
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* The initial context is a basic stack frame that contains arguments for
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* z_thread_entry() return address, that points at z_thread_entry()
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@ -164,6 +183,9 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
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thread->arch.relinquish_cause = _CAUSE_COOP;
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thread->callee_saved.sp =
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(uint32_t)iframe - ___callee_saved_stack_t_SIZEOF;
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arch_setup_callee_saved_regs(thread, thread->callee_saved.sp);
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/* initial values in all other regs/k_thread entries are irrelevant */
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}
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42
arch/arc/core/tls.c
Normal file
42
arch/arc/core/tls.c
Normal file
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@ -0,0 +1,42 @@
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/*
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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 <kernel.h>
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#include <kernel_structs.h>
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#include <kernel_internal.h>
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#include <kernel_tls.h>
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#include <sys/util.h>
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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 ARC 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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@ -98,6 +98,7 @@ SECTIONS {
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_image_rodata_start = .;
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#include <linker/common-rom.ld>
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#include <linker/thread-local-storage.ld>
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SECTION_PROLOGUE(_RODATA_SECTION_NAME,,) {
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KEEP(*(.openocd_dbg))
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@ -220,5 +221,11 @@ SECTIONS {
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KEEP(*(.gnu.attributes))
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}
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/DISCARD/ : { *(.note.GNU-stack) }
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/DISCARD/ : {
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*(.note.GNU-stack)
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*(.got.plt)
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*(.igot.plt)
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*(.got)
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*(.igot)
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}
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}
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