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