92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
/*
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* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __CONTEXT_H__
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#define __CONTEXT_H__
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/*******************************************************************************
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* Constants that allow assembler code to access members of and the 'regs'
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* structure at their correct offsets.
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******************************************************************************/
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#define CTX_REGS_OFFSET 0x0
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#define CTX_GPREG_R0 0x0
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#define CTX_GPREG_R1 0x4
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#define CTX_GPREG_R2 0x8
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#define CTX_GPREG_R3 0xC
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#define CTX_LR 0x10
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#define CTX_SCR 0x14
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#define CTX_SPSR 0x18
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#define CTX_NS_SCTLR 0x1C
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#define CTX_REGS_END 0x20
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#ifndef __ASSEMBLY__
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#include <cassert.h>
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#include <stdint.h>
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/*
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* Common constants to help define the 'cpu_context' structure and its
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* members below.
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*/
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#define WORD_SHIFT 2
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#define DEFINE_REG_STRUCT(name, num_regs) \
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typedef struct name { \
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uint32_t _regs[num_regs]; \
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} __aligned(8) name##_t
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/* Constants to determine the size of individual context structures */
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#define CTX_REG_ALL (CTX_REGS_END >> WORD_SHIFT)
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DEFINE_REG_STRUCT(regs, CTX_REG_ALL);
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#undef CTX_REG_ALL
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#define read_ctx_reg(ctx, offset) ((ctx)->_regs[offset >> WORD_SHIFT])
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#define write_ctx_reg(ctx, offset, val) (((ctx)->_regs[offset >> WORD_SHIFT]) \
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= val)
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typedef struct cpu_context {
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regs_t regs_ctx;
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} cpu_context_t;
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/* Macros to access members of the 'cpu_context_t' structure */
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#define get_regs_ctx(h) (&((cpu_context_t *) h)->regs_ctx)
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/*
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* Compile time assertions related to the 'cpu_context' structure to
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* ensure that the assembler and the compiler view of the offsets of
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* the structure members is the same.
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*/
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CASSERT(CTX_REGS_OFFSET == __builtin_offsetof(cpu_context_t, regs_ctx), \
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assert_core_context_regs_offset_mismatch);
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#endif /* __ASSEMBLY__ */
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#endif /* __CONTEXT_H__ */
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