You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
160 lines
5.3 KiB
160 lines
5.3 KiB
/**************************************************************************** |
|
* pexec.h |
|
* |
|
* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved. |
|
* Author: Gregory Nutt <gnutt@nuttx.org> |
|
* |
|
* Redistribution and use in source and binary forms, with or without |
|
* modification, are permitted provided that the following conditions |
|
* are met: |
|
* |
|
* 1. Redistributions of source code must retain the above copyright |
|
* notice, this list of conditions and the following disclaimer. |
|
* 2. Redistributions in binary form must reproduce the above copyright |
|
* notice, this list of conditions and the following disclaimer in |
|
* the documentation and/or other materials provided with the |
|
* distribution. |
|
* 3. Neither the name NuttX nor the names of its contributors may be |
|
* used to endorse or promote products derived from this software |
|
* without specific prior written permission. |
|
* |
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
|
* POSSIBILITY OF SUCH DAMAGE. |
|
* |
|
****************************************************************************/ |
|
|
|
#ifndef __PEXEC_H |
|
#define __PEXEC_H |
|
|
|
/**************************************************************************** |
|
* Included Files |
|
****************************************************************************/ |
|
|
|
#include <stdint.h> |
|
|
|
/**************************************************************************** |
|
* Definitions |
|
****************************************************************************/ |
|
|
|
#define BPERI 2 |
|
#define ITOBSTACK(i) ((i) << 1) |
|
#define BTOISTACK(i) ((i) >> 1) |
|
#define ROUNDBTOI(i) (((i) + 1) >> 1) |
|
|
|
/**************************************************************************** |
|
* Type Definitions |
|
****************************************************************************/ |
|
|
|
typedef uint32_t ustack_t; /* Stack values are 16-bits in length */ |
|
typedef int32_t sstack_t; |
|
typedef uint32_t paddr_t; /* Addresses are 16-bits in length */ |
|
typedef uint16_t level_t; /* Limits to MAXUINT16 levels */ |
|
|
|
union stack_u |
|
{ |
|
ustack_t *i; |
|
uint8_t *b; |
|
}; |
|
typedef union stack_u stackType; |
|
|
|
/* This structure describes the parameters needed to initialize the p-code |
|
* interpreter. |
|
*/ |
|
|
|
struct pexec_attr_s |
|
{ |
|
/* Instruction space (I-Space) */ |
|
|
|
FAR uint8_t *ispace; /* Allocated I-Space containing p-code data */ |
|
paddr_t entry; /* Entry point */ |
|
paddr_t maxpc; /* Last valid p-code address */ |
|
|
|
/* Read-only data block */ |
|
|
|
FAR uint8_t *rodata; /* Address of read-only data block */ |
|
paddr_t rosize; /* Size of read-only data block */ |
|
|
|
/* Allocate for variable storage */ |
|
|
|
paddr_t varsize; /* Variable storage size */ |
|
paddr_t strsize; /* String storage size */ |
|
}; |
|
|
|
/* This structure defines the current state of the p-code interpreter */ |
|
|
|
struct pexec_s |
|
{ |
|
/* This is the emulated P-Machine stack (D-Space) */ |
|
|
|
stackType dstack; |
|
|
|
/* This is the emulated P-Machine instruction space (I-Space) */ |
|
|
|
FAR uint8_t *ispace; |
|
|
|
/* Address of last valid P-Code */ |
|
|
|
paddr_t maxpc; |
|
|
|
/* These are the emulated P-Machine registers: |
|
* |
|
* spb: Base of the stack |
|
* sp: The Pascal stack pointer |
|
* lsp: Level stack pointer |
|
* csp: The current top of the stack used to manage string |
|
* storage |
|
* fp: Base Register of the current stack frame. Holds the address |
|
* of the base of the stack frame of the current block. |
|
* fop: Pointer to section containing read-only data |
|
* pc: Holds the current p-code location |
|
*/ |
|
|
|
paddr_t spb; /* Pascal stack base */ |
|
paddr_t sp; /* Pascal stack pointer */ |
|
paddr_t lsp; /* Level stack pointer */ |
|
paddr_t csp; /* Character stack pointer */ |
|
paddr_t fp; /* Base of the current frame */ |
|
paddr_t rop; /* Read-only data pointer */ |
|
paddr_t pc; /* Program counter */ |
|
|
|
/* Info needed to perform a simulated reset */ |
|
|
|
paddr_t strsize; /* String stack size */ |
|
paddr_t rosize; /* Read-only stack size */ |
|
paddr_t entry; /* Entry point */ |
|
paddr_t stacksize; /* (debug only) */ |
|
}; |
|
|
|
/**************************************************************************** |
|
* Public Function Prototypes |
|
****************************************************************************/ |
|
|
|
#ifdef __cplusplus |
|
#define EXTERN extern "C" |
|
extern "C" { |
|
#else |
|
#define EXTERN extern |
|
#endif |
|
|
|
EXTERN FAR struct pexec_s *pload(const char *filename, paddr_t varsize, paddr_t strsize); |
|
EXTERN FAR struct pexec_s *pexec_init(struct pexec_attr_s *attr); |
|
EXTERN int pexec(FAR struct pexec_s *st); |
|
EXTERN void pexec_reset(struct pexec_s *st); |
|
EXTERN void pexec_release(struct pexec_s *st); |
|
|
|
#undef EXTERN |
|
#ifdef __cplusplus |
|
} |
|
#endif |
|
|
|
#endif /* __PEXEC_H */ |