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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 */