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/* execute.h -- Header file for architecture dependent execute.c
 
   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
   Copyright (C) 2008 Embecosm Limited
 
   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
 
   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 3 of the License, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   more details.
 
   You should have received a copy of the GNU General Public License along
   with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
/* This program is commented throughout in a fashion suitable for processing
   with Doxygen. */
 
 
#ifndef EXECUTE__H
#define EXECUTE__H
 
#include "spr-defs.h"
#include "opcode/or32.h"
#include "abstract.h"
 
#if DYNAMIC_EXECUTION
#include "setjmp.h"
#include "dyn-rec.h"
#endif
 
 
#define CURINSN(INSN) (strcmp(cur->insn, (INSN)) == 0)
 
/*! Sets a new SPR_SR_OV value, based on next register value */
#if SET_OV_FLAG
#define SET_OV_FLAG_FN(value) \
  if((value) & 0x80000000) \
    cpu_state.sprs[SPR_SR] |= SPR_SR_OV; \
  else \
    cpu_state.sprs[SPR_SR] &= ~SPR_SR_OV
#else
#define SET_OV_FLAG_FN(value)
#endif
 
/*!The main structure holding the current execution state of the CPU
 
   Not to be confused with @c runtime, which holds the state of the
   simulation.
 
   @c insn_ea field is only used to get dump_exe_log() correct.
 
   @c iqueue and @c icomplet fields are only used in analysis().
 
   The micro-operation queue, @c opqs, is only used to speed up
   recompile_page().                                                         */
struct cpu_state {
  uorreg_t             reg[MAX_GPRS];	/*!< General purpose registers */
  uorreg_t             sprs[MAX_SPRS];	/*!< Special purpose registers */
  oraddr_t             insn_ea;		/*!< EA of instrs that have an EA */
  int                  delay_insn;	/*!< Is current instr in delay slot */
  int                  npc_not_valid;	/*!< NPC updated while stalled */
  oraddr_t             pc;		/*!< PC (and translated PC) */
  oraddr_t             pc_delay;	/*!< Delay instr EA register */
  uint32_t             pic_lines;	/*!< State of PIC lines */
  struct iqueue_entry  iqueue;		/*!< Decode of just executed instr */
  struct iqueue_entry  icomplet;        /*!< Decode of instr before this */
 
#if DYNAMIC_EXECUTION
  jmp_buf              excpt_loc;	/*!< Longjump here for exception */
  struct dyn_page     *curr_page;	/*!< Current page in execution */
  struct dyn_page    **dyn_pages;	/*!< Pointers to recompiled pages */
  int32_t              cycles_dec;
  struct op_queue     *opqs;		/*!< Micro-operation queue */
#endif
};
 
/*! History of execution */
struct hist_exec
{
  oraddr_t addr;
  struct hist_exec *prev;
  struct hist_exec *next;
};
 
/* Globally visible data structures */
extern struct cpu_state  cpu_state;
extern oraddr_t          pcnext;
extern int               sbuf_wait_cyc;
extern int               sbuf_total_cyc;
extern int               do_stats;
extern struct hist_exec *hist_exec_tail;
 
 
/* Prototypes for external use */
extern void      dumpreg ();
extern void      dump_exe_log ();
extern int       cpu_clock ();
extern void      cpu_reset ();
extern uorreg_t  evalsim_reg (unsigned int  regno);
extern void      setsim_reg (unsigned int  regno,
			     uorreg_t      value);
extern uorreg_t  eval_operand_val (uint32_t               insn,
				   struct insn_op_struct *opd);
extern void      analysis (struct iqueue_entry *current);
extern void      cpu_reset ();
extern int       cpu_clock ();
extern void      exec_main ();
extern int       depend_operands (struct iqueue_entry *prev,
				  struct iqueue_entry *next);
#endif  /* EXECUTE__H */