271 lines
7.8 KiB
C
271 lines
7.8 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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* z_thread_entry() return address, that points at z_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 z_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 = Z_THREAD_STACK_BUFFER(stack);
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Z_ASSERT_VALID_PRIO(priority, pEntry);
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char *stackEnd;
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char *stackAdjEnd;
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struct init_stack_frame *pInitCtx;
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#ifdef CONFIG_USERSPACE
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size_t stackAdjSize;
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size_t offset = 0;
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/* adjust stack and stack size */
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#if CONFIG_ARC_MPU_VER == 2
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stackAdjSize = Z_ARC_MPUV2_SIZE_ALIGN(stackSize);
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#elif CONFIG_ARC_MPU_VER == 3
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stackAdjSize = STACK_SIZE_ALIGN(stackSize);
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#endif
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stackEnd = pStackMem + stackAdjSize;
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#ifdef CONFIG_STACK_POINTER_RANDOM
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offset = stackAdjSize - stackSize;
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#endif
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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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stackAdjEnd = (char *)STACK_ROUND_DOWN(stackEnd +
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Z_ARCH_THREAD_STACK_RESERVED);
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/* reserve 4 bytes for the start of user sp */
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stackAdjEnd -= 4;
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(*(u32_t *)stackAdjEnd) = STACK_ROUND_DOWN(
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(u32_t)stackEnd - offset);
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#ifdef CONFIG_THREAD_USERSPACE_LOCAL_DATA
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/* reserve stack space for the userspace local data struct */
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thread->userspace_local_data =
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(struct _thread_userspace_local_data *)
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STACK_ROUND_DOWN(stackEnd -
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sizeof(*thread->userspace_local_data) - offset);
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/* update the start of user sp */
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(*(u32_t *)stackAdjEnd) = (u32_t) thread->userspace_local_data;
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#endif
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} else {
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/* for kernel thread, the privilege stack is merged into thread stack */
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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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stackAdjSize = stackAdjSize + CONFIG_PRIVILEGED_STACK_SIZE;
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stackEnd += Z_ARCH_THREAD_STACK_RESERVED;
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thread->arch.priv_stack_start = 0;
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#ifdef CONFIG_THREAD_USERSPACE_LOCAL_DATA
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/* reserve stack space for the userspace local data struct */
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stackAdjEnd = (char *)STACK_ROUND_DOWN(stackEnd
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- sizeof(*thread->userspace_local_data) - offset);
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thread->userspace_local_data =
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(struct _thread_userspace_local_data *)stackAdjEnd;
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#else
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stackAdjEnd = (char *)STACK_ROUND_DOWN(stackEnd - offset);
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#endif
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}
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z_new_thread_init(thread, pStackMem, stackAdjSize, priority, options);
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/* carve the thread entry struct from the "base" of
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the privileged stack */
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pInitCtx = (struct init_stack_frame *)(
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stackAdjEnd - sizeof(struct init_stack_frame));
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/* fill init context */
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pInitCtx->status32 = 0U;
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if (options & K_USER) {
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pInitCtx->pc = ((u32_t)z_user_thread_entry_wrapper);
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} else {
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pInitCtx->pc = ((u32_t)z_thread_entry_wrapper);
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}
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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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#else /* For no USERSPACE feature */
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pStackMem += Z_ARCH_THREAD_STACK_RESERVED;
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stackEnd = pStackMem + stackSize;
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z_new_thread_init(thread, pStackMem, stackSize, priority, options);
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stackAdjEnd = stackEnd;
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pInitCtx = (struct init_stack_frame *)(
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STACK_ROUND_DOWN(stackAdjEnd) -
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sizeof(struct init_stack_frame));
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pInitCtx->status32 = 0U;
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pInitCtx->pc = ((u32_t)z_thread_entry_wrapper);
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#endif
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#ifdef CONFIG_ARC_HAS_SECURE
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pInitCtx->sec_stat = z_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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/* stack check configuration */
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#ifdef CONFIG_ARC_STACK_CHECKING
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#ifdef CONFIG_ARC_HAS_SECURE
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pInitCtx->sec_stat |= _ARC_V2_SEC_STAT_SSC;
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#else
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pInitCtx->status32 |= _ARC_V2_STATUS32_SC;
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#endif
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#ifdef CONFIG_USERSPACE
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if (options & K_USER) {
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thread->arch.u_stack_top = (u32_t)pStackMem;
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thread->arch.u_stack_base = (u32_t)stackEnd;
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thread->arch.k_stack_top =
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(u32_t)(stackEnd + STACK_GUARD_SIZE);
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thread->arch.k_stack_base = (u32_t)
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(stackEnd + Z_ARCH_THREAD_STACK_RESERVED);
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} else {
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thread->arch.k_stack_top = (u32_t)pStackMem;
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thread->arch.k_stack_base = (u32_t)stackEnd;
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thread->arch.u_stack_top = 0;
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thread->arch.u_stack_base = 0;
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}
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#else
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thread->arch.k_stack_top = (u32_t) pStackMem;
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thread->arch.k_stack_base = (u32_t) stackEnd;
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#endif
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#endif
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thread->switch_handle = thread;
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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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}
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#ifdef CONFIG_USERSPACE
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FUNC_NORETURN void z_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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/*
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* adjust 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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#ifdef CONFIG_ARC_STACK_CHECKING
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_current->arch.k_stack_top = _current->arch.priv_stack_start;
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_current->arch.k_stack_base = _current->arch.priv_stack_start +
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CONFIG_PRIVILEGED_STACK_SIZE;
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_current->arch.u_stack_top = _current->stack_info.start;
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_current->arch.u_stack_base = _current->stack_info.start +
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_current->stack_info.size;
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#endif
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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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z_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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