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/*

 * This file is part of SIS.

 *

 * SIS, SPARC instruction simulator V1.6 Copyright (C) 1995 Jiri Gaisler,

 * European Space Agency

 *

 * 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 2 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, write to the Free Software Foundation, Inc., 675

 * Mass Ave, Cambridge, MA 02139, USA.

 *

 */

#include <signal.h>

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <sys/fcntl.h>

#include "sis.h"

#include "libiberty.h"

#include "bfd.h"

#include <dis-asm.h>

#include "sim-config.h"

#include "gdb/remote-sim.h"

#include "gdb/signals.h"

#define PSR_CWP 0x7

#define VAL(x)  strtol(x,(char **)NULL,0)

extern struct disassemble_info dinfo;

extern struct pstate sregs;

extern struct estate ebase;

extern int      current_target_byte_order;

extern int      ctrl_c;

extern int      nfp;

extern int      ift;

extern int      rom8;

extern int      wrp;

extern int      uben;

extern int      sis_verbose;

extern char    *sis_version;

extern struct estate ebase;

extern struct evcell evbuf[];

extern struct irqcell irqarr[];

extern int      irqpend, ext_irl;

extern int      sparclite;

extern int      dumbio;

extern int      sparclite_board;

extern int      termsave;

extern char     uart_dev1[], uart_dev2[];

int             sis_gdb_break = 1;

host_callback *sim_callback;

int

run_sim(sregs, icount, dis)

    struct pstate  *sregs;

    unsigned int    icount;

    int             dis;

{

    int             mexc, irq;

    if (sis_verbose)

        (*sim_callback->printf_filtered) (sim_callback, "resuming at %x\n",

                                          sregs->pc);

   init_stdio();

   sregs->starttime = time(NULL);

   irq = 0;

   while (!sregs->err_mode & (icount > 0)) {

        sregs->fhold = 0;

        sregs->hold = 0;

        sregs->icnt = 1;

        if (sregs->psr & 0x080)

            sregs->asi = 8;

        else

            sregs->asi = 9;

#if 0   /* DELETE ME! for debugging purposes only */

        if (sis_verbose > 1)

            if (sregs->pc == 0 || sregs->npc == 0)

                printf ("bogus pc or npc\n");

#endif

        mexc = memory_read(sregs->asi, sregs->pc, &sregs->inst,

                           2, &sregs->hold);

#if 1   /* DELETE ME! for debugging purposes only */

        if (sis_verbose > 2)

            printf("pc %x, np %x, sp %x, fp %x, wm %x, cw %x, i %08x\n",

                   sregs->pc, sregs->npc,

                   sregs->r[(((sregs->psr & 7) << 4) + 14) & 0x7f],

                   sregs->r[(((sregs->psr & 7) << 4) + 30) & 0x7f],

                   sregs->wim,

                   sregs->psr & 7,

                   sregs->inst);

#endif

        if (sregs->annul) {

            sregs->annul = 0;

            sregs->icnt = 1;

            sregs->pc = sregs->npc;

            sregs->npc = sregs->npc + 4;

        } else {

            if (ext_irl) irq = check_interrupts(sregs);

            if (!irq) {

                if (mexc) {

                    sregs->trap = I_ACC_EXC;

                } else {

                    if ((sis_gdb_break) && (sregs->inst == 0x91d02001)) {

                        if (sis_verbose)

                            (*sim_callback->printf_filtered) (sim_callback,

                                                              "SW BP hit at %x\n", sregs->pc);

                        sim_halt();

                        restore_stdio();

                        clearerr(stdin);

                        return (BPT_HIT);

                    } else

                        dispatch_instruction(sregs);

                }

                icount--;

            }

            if (sregs->trap) {

                irq = 0;

                sregs->err_mode = execute_trap(sregs);

            }

        }

        advance_time(sregs);

        if (ctrl_c) {

            icount = 0;

        }

    }

    sim_halt();

    sregs->tottime += time(NULL) - sregs->starttime;

    restore_stdio();

    clearerr(stdin);

    if (sregs->err_mode)

        error_mode(sregs->pc);

    if (sregs->err_mode)

        return (ERROR);

    if (sregs->bphit) {

        if (sis_verbose)

            (*sim_callback->printf_filtered) (sim_callback,

                                              "HW BP hit at %x\n", sregs->pc);

        return (BPT_HIT);

    }

    if (ctrl_c) {

        ctrl_c = 0;

        return (CTRL_C);

    }

    return (TIME_OUT);

}

void

sim_set_callbacks (ptr)

     host_callback *ptr;

{

  sim_callback = ptr;

}

void

sim_size (memsize)

     int memsize;

{

}

SIM_DESC

sim_open (kind, callback, abfd, argv)

     SIM_OPEN_KIND kind;

     struct host_callback_struct *callback;

     struct bfd *abfd;

     char **argv;

{

    int             argc = 0;

    int             stat = 1;

    int             freq = 0;

    sim_callback = callback;

    while (argv[argc])

      argc++;

    while (stat < argc) {

        if (argv[stat][0] == '-') {

            if (strcmp(argv[stat], "-v") == 0) {

                sis_verbose++;

            } else

            if (strcmp(argv[stat], "-nfp") == 0) {

                nfp = 1;

            } else

            if (strcmp(argv[stat], "-ift") == 0) {

                ift = 1;

            } else

            if (strcmp(argv[stat], "-sparclite") == 0) {

                sparclite = 1;

            } else

            if (strcmp(argv[stat], "-sparclite-board") == 0) {

                sparclite_board = 1;

            } else

            if (strcmp(argv[stat], "-dumbio") == 0) {

                dumbio = 1;

            } else

            if (strcmp(argv[stat], "-wrp") == 0) {

                wrp = 1;

            } else

            if (strcmp(argv[stat], "-rom8") == 0) {

                rom8 = 1;

            } else

            if (strcmp(argv[stat], "-uben") == 0) {

                uben = 1;

            } else

            if (strcmp(argv[stat], "-uart1") == 0) {

                if ((stat + 1) < argc)

                    strcpy(uart_dev1, argv[++stat]);

            } else

            if (strcmp(argv[stat], "-uart2") == 0) {

                if ((stat + 1) < argc)

                    strcpy(uart_dev2, argv[++stat]);

            } else

            if (strcmp(argv[stat], "-nogdb") == 0) {

                sis_gdb_break = 0;

            } else

            if (strcmp(argv[stat], "-freq") == 0) {

                if ((stat + 1) < argc) {

                    freq = VAL(argv[++stat]);

                }

            } else {

                (*sim_callback->printf_filtered) (sim_callback,

                                                  "unknown option %s\n",

                                                  argv[stat]);

            }

        } else

            bfd_load(argv[stat]);

        stat++;

    }

    if (sis_verbose) {

        (*sim_callback->printf_filtered) (sim_callback, "\n SIS - SPARC instruction simulator %s\n", sis_version);

        (*sim_callback->printf_filtered) (sim_callback, " Bug-reports to Jiri Gaisler ESA/ESTEC (jgais@wd.estec.esa.nl)\n");

        if (nfp)

          (*sim_callback->printf_filtered) (sim_callback, "no FPU\n");

        if (sparclite)

          (*sim_callback->printf_filtered) (sim_callback, "simulating Sparclite\n");

        if (dumbio)

          (*sim_callback->printf_filtered) (sim_callback, "dumb IO (no input, dumb output)\n");

        if (sis_gdb_break == 0)

          (*sim_callback->printf_filtered) (sim_callback, "disabling GDB trap handling for breakpoints\n");

        if (freq)

          (*sim_callback->printf_filtered) (sim_callback, " ERC32 freq %d Mhz\n", freq);

    }

    sregs.freq = freq ? freq : 15;

    termsave = fcntl(0, F_GETFL, 0);

    INIT_DISASSEMBLE_INFO(dinfo, stdout,(fprintf_ftype)fprintf);

    dinfo.endian = BFD_ENDIAN_BIG;

    reset_all();

    ebase.simtime = 0;

    init_sim();

    init_bpt(&sregs);

    reset_stat(&sregs);

    /* Fudge our descriptor for now.  */

    return (SIM_DESC) 1;

}

void

sim_close(sd, quitting)

     SIM_DESC sd;

     int quitting;

{

    exit_sim();

    fcntl(0, F_SETFL, termsave);

};

SIM_RC

sim_load(sd, prog, abfd, from_tty)

     SIM_DESC sd;

     char *prog;

     bfd *abfd;

     int from_tty;

{

    bfd_load (prog);

    return SIM_RC_OK;

}

SIM_RC

sim_create_inferior(sd, abfd, argv, env)

     SIM_DESC sd;

     struct bfd *abfd;

     char **argv;

     char **env;

{

    bfd_vma start_address = 0;

    if (abfd != NULL)

      start_address = bfd_get_start_address (abfd);

    ebase.simtime = 0;

    reset_all();

    reset_stat(&sregs);

    sregs.pc = start_address & ~3;

    sregs.npc = sregs.pc + 4;

    return SIM_RC_OK;

}

int

sim_store_register(sd, regno, value, length)

    SIM_DESC sd;

    int             regno;

    unsigned char  *value;

    int length;

{

    /* FIXME: Review the computation of regval.  */

    int regval;

    if (current_target_byte_order == BIG_ENDIAN)

        regval = (value[0] << 24) | (value[1] << 16)

                 | (value[2] << 8) | value[3];

    else

        regval = (value[3] << 24) | (value[2] << 16)

                 | (value[1] << 8) | value[0];

    set_regi(&sregs, regno, regval);

    return -1;

}

int

sim_fetch_register(sd, regno, buf, length)

     SIM_DESC sd;

    int             regno;

    unsigned char  *buf;

     int length;

{

    get_regi(&sregs, regno, buf);

    return -1;

}

int

sim_write(sd, mem, buf, length)

     SIM_DESC sd;

    SIM_ADDR             mem;

    unsigned char  *buf;

    int             length;

{

    return (sis_memory_write(mem, buf, length));

}

int

sim_read(sd, mem, buf, length)

     SIM_DESC sd;

     SIM_ADDR mem;

     unsigned char *buf;

     int length;

{

    return (sis_memory_read(mem, buf, length));

}

void

sim_info(sd, verbose)

     SIM_DESC sd;

     int verbose;

{

    show_stat(&sregs);

}

int             simstat = OK;

void

sim_stop_reason(sd, reason, sigrc)

     SIM_DESC sd;

     enum sim_stop * reason;

     int *sigrc;

{

    switch (simstat) {

        case CTRL_C:

        *reason = sim_stopped;

        *sigrc = TARGET_SIGNAL_INT;

        break;

    case OK:

    case TIME_OUT:

    case BPT_HIT:

        *reason = sim_stopped;

        *sigrc = TARGET_SIGNAL_TRAP;

        break;

    case ERROR:

        *sigrc = 0;

        *reason = sim_exited;

    }

    ctrl_c = 0;

    simstat = OK;

}

/* Flush all register windows out to the stack.  Starting after the invalid

   window, flush all windows up to, and including the current window.  This

   allows GDB to do backtraces and look at local variables for frames that

   are still in the register windows.  Note that strictly speaking, this

   behavior is *wrong* for several reasons.  First, it doesn't use the window

   overflow handlers.  It therefore assumes standard frame layouts and window

   handling policies.  Second, it changes system state behind the back of the

   target program.  I expect this to mainly pose problems when debugging trap

   handlers.

*/

static void

flush_windows ()

{

  int invwin;

  int cwp;

  int win;

  int ws;

  /* Keep current window handy */

  cwp = sregs.psr & PSR_CWP;

  /* Calculate the invalid window from the wim. */

  for (invwin = 0; invwin <= PSR_CWP; invwin++)

    if ((sregs.wim >> invwin) & 1)

      break;

  /* Start saving with the window after the invalid window. */

  invwin = (invwin - 1) & PSR_CWP;

  for (win = invwin; ; win = (win - 1) & PSR_CWP)

    {

      uint32 sp;

      int i;

      sp = sregs.r[(win * 16 + 14) & 0x7f];

#if 1

      if (sis_verbose > 2) {

        uint32 fp = sregs.r[(win * 16 + 30) & 0x7f];

        printf("flush_window: win %d, sp %x, fp %x\n", win, sp, fp);

      }

#endif

      for (i = 0; i < 16; i++)

        memory_write (11, sp + 4 * i, &sregs.r[(win * 16 + 16 + i) & 0x7f], 2,

                      &ws);

      if (win == cwp)

        break;

    }

}

void

sim_resume(SIM_DESC sd, int step, int siggnal)

{

    simstat = run_sim(&sregs, -1, 0);

    if (sis_gdb_break) flush_windows ();

}

int

sim_trace (sd)

     SIM_DESC sd;

{

  /* FIXME: unfinished */

  sim_resume (sd, 0, 0);

  return 1;

}

void

sim_do_command(sd, cmd)

     SIM_DESC sd;

    char           *cmd;

{

    exec_cmd(&sregs, cmd);

}

#if 0 /* FIXME: These shouldn't exist.  */

int

sim_insert_breakpoint(int addr)

{

    if (sregs.bptnum < BPT_MAX) {

        sregs.bpts[sregs.bptnum] = addr & ~0x3;

        sregs.bptnum++;

        if (sis_verbose)

            (*sim_callback->printf_filtered) (sim_callback, "inserted HW BP at %x\n", addr);

        return 0;

    } else

        return 1;

}

int

sim_remove_breakpoint(int addr)

{

    int             i = 0;

    while ((i < sregs.bptnum) && (sregs.bpts[i] != addr))

        i++;

    if (addr == sregs.bpts[i]) {

        for (; i < sregs.bptnum - 1; i++)

            sregs.bpts[i] = sregs.bpts[i + 1];

        sregs.bptnum -= 1;

        if (sis_verbose)

            (*sim_callback->printf_filtered) (sim_callback, "removed HW BP at %x\n", addr);

        return 0;

    }

    return 1;

}

#endif