223 lines
6.4 KiB
C
223 lines
6.4 KiB
C
/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief New thread creation for ARCv2
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*
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* Core thread related primitives for the ARCv2 processor architecture.
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*/
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#include <kernel.h>
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#include <toolchain.h>
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#include <kernel_structs.h>
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#include <offsets_short.h>
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#include <wait_q.h>
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#ifdef CONFIG_INIT_STACKS
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#include <string.h>
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#endif /* CONFIG_INIT_STACKS */
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#ifdef CONFIG_USERSPACE
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#include <arch/arc/v2/mpu/arc_core_mpu.h>
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#endif
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/* initial stack frame */
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struct init_stack_frame {
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u32_t pc;
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#ifdef CONFIG_ARC_HAS_SECURE
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u32_t sec_stat;
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#endif
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u32_t status32;
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u32_t r3;
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u32_t r2;
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u32_t r1;
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u32_t r0;
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};
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/*
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* @brief Initialize a new thread from its stack space
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*
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* The thread control structure is put at the lower address of the stack. An
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* initial context, to be "restored" by __return_from_coop(), is put at
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* the other end of the stack, and thus reusable by the stack when not
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* needed anymore.
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*
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* The initial context is a basic stack frame that contains arguments for
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* _thread_entry() return address, that points at _thread_entry()
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* and status register.
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*
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* <options> is currently unused.
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*
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* @param pStackmem the pointer to aligned stack memory
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* @param stackSize the stack size in bytes
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* @param pEntry thread entry point routine
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* @param parameter1 first param to entry point
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* @param parameter2 second param to entry point
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* @param parameter3 third param to entry point
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* @param priority thread priority
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* @param options thread options: K_ESSENTIAL
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*
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* @return N/A
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*/
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void _new_thread(struct k_thread *thread, k_thread_stack_t *stack,
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size_t stackSize, k_thread_entry_t pEntry,
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void *parameter1, void *parameter2, void *parameter3,
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int priority, unsigned int options)
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{
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char *pStackMem = K_THREAD_STACK_BUFFER(stack);
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_ASSERT_VALID_PRIO(priority, pEntry);
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char *stackEnd;
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struct init_stack_frame *pInitCtx;
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#if CONFIG_USERSPACE
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#if CONFIG_ARC_MPU_VER == 2
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stackSize = POW2_CEIL(STACK_SIZE_ALIGN(stackSize));
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#elif CONFIG_ARC_MPU_VER == 3
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stackSize = ROUND_UP(stackSize, STACK_ALIGN);
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#endif
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#endif
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stackEnd = pStackMem + stackSize;
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#if CONFIG_USERSPACE
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/* for kernel thread, the privilege stack is merged into thread stack */
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if (!(options & K_USER)) {
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/* if MPU_STACK_GUARD is enabled, reserve the the stack area
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* |---------------------| |----------------|
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* | user stack | | stack guard |
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* |---------------------| to |----------------|
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* | stack guard | | kernel thread |
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* |---------------------| | stack |
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* | privilege stack | | |
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* ---------------------------------------------
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*/
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pStackMem += STACK_GUARD_SIZE;
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stackSize = stackSize + CONFIG_PRIVILEGED_STACK_SIZE;
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stackEnd += CONFIG_PRIVILEGED_STACK_SIZE + STACK_GUARD_SIZE;
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}
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#endif
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_new_thread_init(thread, pStackMem, stackSize, priority, options);
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/* carve the thread entry struct from the "base" of the stack */
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pInitCtx = (struct init_stack_frame *)(STACK_ROUND_DOWN(stackEnd) -
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sizeof(struct init_stack_frame));
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#if CONFIG_USERSPACE
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if (options & K_USER) {
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pInitCtx->pc = ((u32_t)_user_thread_entry_wrapper);
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} else {
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pInitCtx->pc = ((u32_t)_thread_entry_wrapper);
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}
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#else
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pInitCtx->pc = ((u32_t)_thread_entry_wrapper);
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#endif
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#ifdef CONFIG_ARC_HAS_SECURE
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pInitCtx->sec_stat = _arc_v2_aux_reg_read(_ARC_V2_SEC_STAT);
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#endif
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pInitCtx->r0 = (u32_t)pEntry;
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pInitCtx->r1 = (u32_t)parameter1;
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pInitCtx->r2 = (u32_t)parameter2;
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pInitCtx->r3 = (u32_t)parameter3;
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/*
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* For now set the interrupt priority to 15
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* we can leave interrupt enable flag set to 0 as
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* seti instruction in the end of the _Swap() will
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* enable the interrupts based on intlock_key
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* value.
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*/
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#ifdef CONFIG_ARC_STACK_CHECKING
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pInitCtx->status32 = _ARC_V2_STATUS32_SC |
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_ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL);
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thread->arch.stack_base = (u32_t) stackEnd;
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#else
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pInitCtx->status32 = _ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL);
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#endif
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#if CONFIG_USERSPACE
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/*
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* enable US bit, US is read as zero in user mode. This will allow use
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* mode sleep instructions, and it enables a form of denial-of-service
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* attack by putting the processor in sleep mode, but since interrupt
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* level/mask can't be set from user space that's not worse than
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* executing a loop without yielding.
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*/
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pInitCtx->status32 |= _ARC_V2_STATUS32_US;
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if (options & K_USER) {
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thread->arch.priv_stack_start =
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(u32_t) (stackEnd + STACK_GUARD_SIZE);
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thread->arch.priv_stack_size =
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(u32_t)CONFIG_PRIVILEGED_STACK_SIZE;
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} else {
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thread->arch.priv_stack_start = 0;
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thread->arch.priv_stack_size = 0;
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}
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#endif
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#ifdef CONFIG_THREAD_MONITOR
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/*
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* In debug mode thread->entry give direct access to the thread entry
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* and the corresponding parameters.
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*/
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thread->entry = (struct __thread_entry *)(pInitCtx);
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#endif
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/*
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* intlock_key is constructed based on ARCv2 ISA Programmer's
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* Reference Manual CLRI instruction description:
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* dst[31:6] dst[5] dst[4] dst[3:0]
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* 26'd0 1 STATUS32.IE STATUS32.E[3:0]
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*/
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thread->arch.intlock_key = 0x3F;
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thread->arch.relinquish_cause = _CAUSE_COOP;
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thread->callee_saved.sp =
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(u32_t)pInitCtx - ___callee_saved_stack_t_SIZEOF;
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/* initial values in all other regs/k_thread entries are irrelevant */
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thread_monitor_init(thread);
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}
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#ifdef CONFIG_USERSPACE
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FUNC_NORETURN void _arch_user_mode_enter(k_thread_entry_t user_entry,
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void *p1, void *p2, void *p3)
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{
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_current->base.user_options |= K_USER;
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/*
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* ajust the thread stack layout
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* |----------------| |---------------------|
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* | stack guard | | user stack |
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* |----------------| to |---------------------|
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* | kernel thread | | stack guard |
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* | stack | |---------------------|
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* | | | privilege stack |
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* ---------------------------------------------
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*/
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_current->stack_info.start = (u32_t)_current->stack_obj;
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_current->stack_info.size -= CONFIG_PRIVILEGED_STACK_SIZE;
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_current->arch.priv_stack_start =
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(u32_t) (_current->stack_info.start +
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_current->stack_info.size + STACK_GUARD_SIZE);
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_current->arch.priv_stack_size =
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(u32_t)CONFIG_PRIVILEGED_STACK_SIZE;
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/* possible optimizaiton: no need to load mem domain anymore */
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/* need to lock cpu here ? */
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configure_mpu_thread(_current);
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_arc_userspace_enter(user_entry, p1, p2, p3,
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(u32_t)_current->stack_obj,
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_current->stack_info.size);
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CODE_UNREACHABLE;
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}
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#endif
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