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>
47 lines
1.1 KiB
C
47 lines
1.1 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 ARCv2 public error handling
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*
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* ARC-specific kernel error handling interface. Included by arc/arch.h.
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*/
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#ifndef _ARCH_ARC_V2_ERROR_H_
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#define _ARCH_ARC_V2_ERROR_H_
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#include <arch/arc/v2/exc.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef _ASMLANGUAGE
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#include <toolchain/gcc.h>
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extern FUNC_NORETURN void _NanoFatalErrorHandler(unsigned int,
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const NANO_ESF*);
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extern void _SysFatalErrorHandler(unsigned int cause, const NANO_ESF *esf);
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#endif
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#define _NANO_ERR_HW_EXCEPTION (0) /* MPU/Bus/Usage fault */
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#define _NANO_ERR_STACK_CHK_FAIL (2) /* Stack corruption detected */
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#define _NANO_ERR_ALLOCATION_FAIL (3) /* Kernel Allocation Failure */
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#define _NANO_ERR_KERNEL_OOPS (4) /* Kernel oops (fatal to thread) */
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#define _NANO_ERR_KERNEL_PANIC (5) /* Kernel panic (fatal to system) */
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#define _TRAP_S_SCALL_IRQ_OFFLOAD 1
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#define _TRAP_S_CALL_RUNTIME_EXCEPT 2
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#define _TRAP_S_CALL_SYSTEM_CALL 3
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ARCH_ARC_V2_ERROR_H_ */
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