f81dee0b2b
* add the implementation of syscall
* based on 'trap_s' intruction, id = 3
* add the privilege stack
* the privilege stack is allocted with thread stack
* for the kernel thread, the privilege stack is also a
part of thread stack, the start of stack can be configured
as stack guard
* for the user thread, no stack guard, when the user stack is
overflow, it will fall into kernel memory area which requires
kernel privilege, privilege violation will be raised
* modify the linker template and add MPU_ADDR_ALIGN
* add user space corresponding codes in mpu
* the user sp aux reg will be part of thread context
* When user thread is interruptted for the 1st time, the context is
saved in user stack (U bit of IRQ_CTLR is set to 1). When nest
interrupt comes, the context is saved in thread's privilege stack
* the arc_mpu_regions.c is moved to board folder, as it's board
specific
* the above codes have been tested through tests/kernel/mem_protect/
userspace for MPU version 2
Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
/*
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* Copyright (c) 2017 Intel Corporation
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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 Per-arch thread definition
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*
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* This file contains definitions for
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*
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* struct _thread_arch
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* struct _callee_saved
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* struct _caller_saved
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*
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* necessary to instantiate instances of struct k_thread.
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*/
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#ifndef _kernel_arch_thread__h_
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#define _kernel_arch_thread__h_
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/*
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* Reason a thread has relinquished control: threads can only be in the NONE
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* or COOP state, threads can be one in the four.
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*/
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#define _CAUSE_NONE 0
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#define _CAUSE_COOP 1
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#define _CAUSE_RIRQ 2
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#define _CAUSE_FIRQ 3
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#ifndef _ASMLANGUAGE
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#include <zephyr/types.h>
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struct _caller_saved {
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/*
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* Saved on the stack as part of handling a regular IRQ or by the
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* kernel when calling the FIRQ return code.
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*/
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};
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typedef struct _caller_saved _caller_saved_t;
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struct _callee_saved {
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u32_t sp; /* r28 */
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};
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typedef struct _callee_saved _callee_saved_t;
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struct _thread_arch {
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/* interrupt key when relinquishing control */
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u32_t intlock_key;
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/* one of the _CAUSE_xxxx definitions above */
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int relinquish_cause;
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/* return value from _Swap */
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unsigned int return_value;
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#ifdef CONFIG_ARC_STACK_CHECKING
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/* High address of stack region, stack grows downward from this
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* location. Usesd for hardware stack checking
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*/
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u32_t stack_base;
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#endif
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#ifdef CONFIG_USERSPACE
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u32_t priv_stack_start;
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u32_t priv_stack_size;
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#endif
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};
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typedef struct _thread_arch _thread_arch_t;
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#endif /* _ASMLANGUAGE */
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#endif /* _kernel_arch_thread__h_ */
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