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zephyr/arch/arc/core/thread.c
Kumar Gala a1b77fd589 zephyr: replace zephyr integer types with C99 types 
git grep -l 'u\(8\|16\|32\|64\)_t' | \
		xargs sed -i "s/u\(8\|16\|32\|64\)_t/uint\1_t/g"
	git grep -l 's\(8\|16\|32\|64\)_t' | \
		xargs sed -i "s/s\(8\|16\|32\|64\)_t/int\1_t/g"

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
2020-06-08 08:23:57 -05:00

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/*
* 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 <ksched.h>
#include <offsets_short.h>
#include <wait_q.h>
#ifdef CONFIG_USERSPACE
#include <arch/arc/v2/mpu/arc_core_mpu.h>
#endif
/* initial stack frame */
struct init_stack_frame {
uint32_t pc;
#ifdef CONFIG_ARC_HAS_SECURE
uint32_t sec_stat;
#endif
uint32_t status32;
uint32_t r3;
uint32_t r2;
uint32_t r1;
uint32_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
* z_thread_entry() return address, that points at z_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 arch_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 = Z_THREAD_STACK_BUFFER(stack);
char *stackEnd;
char *priv_stack_end;
struct init_stack_frame *pInitCtx;
#ifdef CONFIG_USERSPACE
size_t stackAdjSize;
size_t offset = 0;
stackAdjSize = Z_ARC_MPU_SIZE_ALIGN(stackSize);
stackEnd = pStackMem + stackAdjSize;
#ifdef CONFIG_STACK_POINTER_RANDOM
offset = stackAdjSize - stackSize;
#endif
if (options & K_USER) {
#ifdef CONFIG_GEN_PRIV_STACKS
thread->arch.priv_stack_start =
(uint32_t)z_priv_stack_find(thread->stack_obj);
#else
thread->arch.priv_stack_start =
(uint32_t)(stackEnd + STACK_GUARD_SIZE);
#endif
priv_stack_end = (char *)Z_STACK_PTR_ALIGN(
thread->arch.priv_stack_start +
CONFIG_PRIVILEGED_STACK_SIZE);
/* reserve 4 bytes for the start of user sp */
priv_stack_end -= 4;
(*(uint32_t *)priv_stack_end) = Z_STACK_PTR_ALIGN(
(uint32_t)stackEnd - offset);
#ifdef CONFIG_THREAD_USERSPACE_LOCAL_DATA
/* reserve stack space for the userspace local data struct */
thread->userspace_local_data =
(struct _thread_userspace_local_data *)
Z_STACK_PTR_ALIGN(stackEnd -
sizeof(*thread->userspace_local_data) - offset);
/* update the start of user sp */
(*(uint32_t *)priv_stack_end) =
(uint32_t) thread->userspace_local_data;
#endif
} else {
pStackMem += STACK_GUARD_SIZE;
stackEnd += STACK_GUARD_SIZE;
thread->arch.priv_stack_start = 0;
#ifdef CONFIG_THREAD_USERSPACE_LOCAL_DATA
/* reserve stack space for the userspace local data struct */
priv_stack_end = (char *)Z_STACK_PTR_ALIGN(stackEnd
- sizeof(*thread->userspace_local_data) - offset);
thread->userspace_local_data =
(struct _thread_userspace_local_data *)priv_stack_end;
#else
priv_stack_end = (char *)Z_STACK_PTR_ALIGN(stackEnd - offset);
#endif
}
z_new_thread_init(thread, pStackMem, stackAdjSize);
/* carve the thread entry struct from the "base" of
the privileged stack */
pInitCtx = (struct init_stack_frame *)(
priv_stack_end - sizeof(struct init_stack_frame));
/* fill init context */
pInitCtx->status32 = 0U;
if (options & K_USER) {
pInitCtx->pc = ((uint32_t)z_user_thread_entry_wrapper);
} else {
pInitCtx->pc = ((uint32_t)z_thread_entry_wrapper);
}
/*
* 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;
#else /* For no USERSPACE feature */
pStackMem += STACK_GUARD_SIZE;
stackEnd = pStackMem + stackSize;
z_new_thread_init(thread, pStackMem, stackSize);
priv_stack_end = stackEnd;
pInitCtx = (struct init_stack_frame *)(
Z_STACK_PTR_ALIGN(priv_stack_end) -
sizeof(struct init_stack_frame));
pInitCtx->status32 = 0U;
pInitCtx->pc = ((uint32_t)z_thread_entry_wrapper);
#endif
#ifdef CONFIG_ARC_SECURE_FIRMWARE
pInitCtx->sec_stat = z_arc_v2_aux_reg_read(_ARC_V2_SEC_STAT);
#endif
pInitCtx->r0 = (uint32_t)pEntry;
pInitCtx->r1 = (uint32_t)parameter1;
pInitCtx->r2 = (uint32_t)parameter2;
pInitCtx->r3 = (uint32_t)parameter3;
/* stack check configuration */
#ifdef CONFIG_ARC_STACK_CHECKING
#ifdef CONFIG_ARC_SECURE_FIRMWARE
pInitCtx->sec_stat |= _ARC_V2_SEC_STAT_SSC;
#else
pInitCtx->status32 |= _ARC_V2_STATUS32_SC;
#endif
#ifdef CONFIG_USERSPACE
if (options & K_USER) {
thread->arch.u_stack_top = (uint32_t)pStackMem;
thread->arch.u_stack_base = (uint32_t)stackEnd;
thread->arch.k_stack_top =
(uint32_t)(thread->arch.priv_stack_start);
thread->arch.k_stack_base = (uint32_t)
(thread->arch.priv_stack_start + CONFIG_PRIVILEGED_STACK_SIZE);
} else {
thread->arch.k_stack_top = (uint32_t)pStackMem;
thread->arch.k_stack_base = (uint32_t)stackEnd;
thread->arch.u_stack_top = 0;
thread->arch.u_stack_base = 0;
}
#else
thread->arch.k_stack_top = (uint32_t) pStackMem;
thread->arch.k_stack_base = (uint32_t) stackEnd;
#endif
#endif
#ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS
pInitCtx->status32 |= _ARC_V2_STATUS32_AD;
#endif
thread->switch_handle = thread;
thread->arch.relinquish_cause = _CAUSE_COOP;
thread->callee_saved.sp =
(uint32_t)pInitCtx - ___callee_saved_stack_t_SIZEOF;
/* initial values in all other regs/k_thread entries are irrelevant */
}
void *z_arch_get_next_switch_handle(struct k_thread **old_thread)
{
*old_thread = _current;
return z_get_next_switch_handle(*old_thread);
}
#ifdef CONFIG_USERSPACE
FUNC_NORETURN void arch_user_mode_enter(k_thread_entry_t user_entry,
void *p1, void *p2, void *p3)
{
_current->stack_info.start = (uint32_t)_current->stack_obj;
#ifdef CONFIG_GEN_PRIV_STACKS
_current->arch.priv_stack_start =
(uint32_t)z_priv_stack_find(_current->stack_obj);
#else
_current->arch.priv_stack_start =
(uint32_t)(_current->stack_info.start +
_current->stack_info.size + STACK_GUARD_SIZE);
#endif
#ifdef CONFIG_ARC_STACK_CHECKING
_current->arch.k_stack_top = _current->arch.priv_stack_start;
_current->arch.k_stack_base = _current->arch.priv_stack_start +
CONFIG_PRIVILEGED_STACK_SIZE;
_current->arch.u_stack_top = _current->stack_info.start;
_current->arch.u_stack_base = _current->stack_info.start +
_current->stack_info.size;
#endif
/* possible optimizaiton: no need to load mem domain anymore */
/* need to lock cpu here ? */
configure_mpu_thread(_current);
z_arc_userspace_enter(user_entry, p1, p2, p3,
(uint32_t)_current->stack_obj,
_current->stack_info.size, _current);
CODE_UNREACHABLE;
}
#endif
#if defined(CONFIG_FPU) && defined(CONFIG_FPU_SHARING)
int arch_float_disable(struct k_thread *thread)
{
unsigned int key;
/* Ensure a preemptive context switch does not occur */
key = irq_lock();
/* Disable all floating point capabilities for the thread */
thread->base.user_options &= ~K_FP_REGS;
irq_unlock(key);
return 0;
}
int arch_float_enable(struct k_thread *thread)
{
unsigned int key;
/* Ensure a preemptive context switch does not occur */
key = irq_lock();
/* Enable all floating point capabilities for the thread */
thread->base.user_options |= K_FP_REGS;
irq_unlock(key);
return 0;
}
#endif /* CONFIG_FPU && CONFIG_FPU_SHARING */
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