160 lines
5.3 KiB
C
160 lines
5.3 KiB
C
/****************************************************************************
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* pexec.h
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*
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* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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#ifndef __PEXEC_H
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#define __PEXEC_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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/****************************************************************************
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* Definitions
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****************************************************************************/
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#define BPERI 2
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#define ITOBSTACK(i) ((i) << 1)
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#define BTOISTACK(i) ((i) >> 1)
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#define ROUNDBTOI(i) (((i) + 1) >> 1)
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/****************************************************************************
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* Type Definitions
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****************************************************************************/
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typedef uint32_t ustack_t; /* Stack values are 16-bits in length */
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typedef int32_t sstack_t;
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typedef uint32_t paddr_t; /* Addresses are 16-bits in length */
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typedef uint16_t level_t; /* Limits to MAXUINT16 levels */
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union stack_u
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{
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ustack_t *i;
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uint8_t *b;
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};
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typedef union stack_u stackType;
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/* This structure describes the parameters needed to initialize the p-code
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* interpreter.
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*/
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struct pexec_attr_s
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{
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/* Instruction space (I-Space) */
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FAR uint8_t *ispace; /* Allocated I-Space containing p-code data */
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paddr_t entry; /* Entry point */
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paddr_t maxpc; /* Last valid p-code address */
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/* Read-only data block */
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FAR uint8_t *rodata; /* Address of read-only data block */
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paddr_t rosize; /* Size of read-only data block */
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/* Allocate for variable storage */
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paddr_t varsize; /* Variable storage size */
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paddr_t strsize; /* String storage size */
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};
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/* This structure defines the current state of the p-code interpreter */
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struct pexec_s
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{
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/* This is the emulated P-Machine stack (D-Space) */
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stackType dstack;
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/* This is the emulated P-Machine instruction space (I-Space) */
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FAR uint8_t *ispace;
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/* Address of last valid P-Code */
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paddr_t maxpc;
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/* These are the emulated P-Machine registers:
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*
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* spb: Base of the stack
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* sp: The Pascal stack pointer
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* lsp: Level stack pointer
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* csp: The current top of the stack used to manage string
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* storage
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* fp: Base Register of the current stack frame. Holds the address
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* of the base of the stack frame of the current block.
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* fop: Pointer to section containing read-only data
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* pc: Holds the current p-code location
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*/
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paddr_t spb; /* Pascal stack base */
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paddr_t sp; /* Pascal stack pointer */
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paddr_t lsp; /* Level stack pointer */
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paddr_t csp; /* Character stack pointer */
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paddr_t fp; /* Base of the current frame */
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paddr_t rop; /* Read-only data pointer */
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paddr_t pc; /* Program counter */
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/* Info needed to perform a simulated reset */
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paddr_t strsize; /* String stack size */
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paddr_t rosize; /* Read-only stack size */
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paddr_t entry; /* Entry point */
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paddr_t stacksize; /* (debug only) */
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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EXTERN FAR struct pexec_s *pload(const char *filename, paddr_t varsize, paddr_t strsize);
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EXTERN FAR struct pexec_s *pexec_init(struct pexec_attr_s *attr);
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EXTERN int pexec(FAR struct pexec_s *st);
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EXTERN void pexec_reset(struct pexec_s *st);
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EXTERN void pexec_release(struct pexec_s *st);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __PEXEC_H */ |