path: root/sim/erc32/interf.c

/*
 * 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 "sis.h"
#include "bfd.h"
#include <dis-asm.h>

#ifndef fprintf
extern          fprintf();
#endif

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

extern char   **buildargv(char *input);

extern struct disassemble_info dinfo;
extern struct pstate sregs;
extern struct estate ebase;

extern int      ctrl_c;
extern int      nfp;
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 char	uart_dev1[], uart_dev2[];

int             sis_gdb_break = 1;

#ifdef IUREV0
extern int      iurev0;
#endif

#ifdef MECREV0
extern int      mecrev0;
#endif

run_sim(sregs, go, icount, dis)
    struct pstate  *sregs;
    int             go;
    unsigned int    icount;
    int             dis;
{
    int             mexc, ws;

    if (sis_verbose)
	printf_filtered("resuming at %x\n", sregs->pc);
    sregs->starttime = time(NULL);
    while ((!sregs->err_mode & (go || (icount > 0))) &&
	   ((sregs->bptnum == 0) || !(sregs->bphit = check_bpt(sregs)))) {

	sregs->fhold = 0;
	sregs->hold = 0;
	sregs->icnt = 0;

	check_interrupts(sregs);
	if (sregs->trap) {
	    sregs->err_mode = execute_trap(sregs);
	} else {
	    if (sregs->psr & 0x080)
		sregs->asi = 8;
	    else
		sregs->asi = 9;
#ifdef IUREV0
	    if (iurev0 && sregs->rett_err) {
		sregs->asi &= ~0x1;
		sregs->asi |= ((sregs->psr & 0x040) >> 6);
	    }
#endif

	    mexc = memory_read(sregs->asi, sregs->pc, &sregs->inst, &sregs->hold);
	    if (sregs->annul) {
		sregs->annul = 0;
		sregs->icnt = 1;
		sregs->pc = sregs->npc;
		sregs->npc = sregs->npc + 4;
	    } else {
		if (mexc) {
		    sregs->trap = I_ACC_EXC;
		} else {
		    if (sregs->histlen) {
			sregs->histbuf[sregs->histind].addr = sregs->pc;
			sregs->histbuf[sregs->histind].time = ebase.simtime;
			sregs->histind++;
			if (sregs->histind >= sregs->histlen)
			    sregs->histind = 0;
		    }
		    if (dis) {
			printf(" %8d ", ebase.simtime);
			dis_mem(sregs->pc, 1, &dinfo);
		    }
		    if ((sis_gdb_break) && (sregs->inst == 0x91d02001)) {
			if (sis_verbose)
			    printf_filtered("SW BP hit at %x\n", sregs->pc);
			return (BPT_HIT);
		    } else
			dispatch_instruction(sregs);
		}
		icount--;
	    }
	    if (sregs->trap) {
		sregs->err_mode = execute_trap(sregs);
	    }
	}
	advance_time(sregs);
	if (ctrl_c) {
	    go = icount = 0;
	}
    }
    sregs->tottime += time(NULL) - sregs->starttime;
    if (sregs->err_mode)
	error_mode(sregs->pc);
    if (sregs->err_mode)
	return (ERROR);
    if (sregs->bphit) {
	if (sis_verbose)
	    printf_filtered("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_open(char *args)
{

    int             argc = 0;
    char          **argv;
    int             cont = 1;
    int             stat = 0;
    int             grdl = 0;
    int             freq = 15;

    printf_filtered("\n SIS - SPARC instruction simulator %s\n", sis_version);
    printf_filtered(" Bug-reports to Jiri Gaisler ESA/ESTEC (jgais@wd.estec.esa.nl)\n");
    argv = buildargv(args);
    if (argv != NULL)
	while (argv[argc])
	    argc++;
    while (stat < argc) {
	if (argv[stat][0] == '-') {
	    if (strcmp(argv[stat], "-v") == 0) {
		sis_verbose = 1;
	    }
#ifdef IUREV0
	    if (strcmp(argv[stat], "-iurev0") == 0) {
		iurev0 = 1;
		printf_filtered(" simulating IU rev.0 jmpl/restore bug\n");
	    }
#endif
#ifdef MECREV0
	    if (strcmp(argv[stat], "-mecrev0") == 0) {
		mecrev0 = 1;
		printf_filtered(" simulating MEC rev.0 timer and uart interrupt bug\n");
	    }
#endif
	    if (strcmp(argv[stat], "-nfp") == 0) {
		printf_filtered("no FPU\n");
		nfp = 1;
	    }
            if (strcmp(argv[stat], "-uart1") == 0) {
                if ((stat + 1) < argc)
                    strcpy(uart_dev1, argv[++stat]);
	    }
            if (strcmp(argv[stat], "-uart2") == 0) {
                if ((stat + 1) < argc)
                    strcpy(uart_dev2, argv[++stat]);
	    }
	    if (strcmp(argv[stat], "-nogdb") == 0) {
		printf_filtered("disabling GDB trap handling for breakpoints\n");
		sis_gdb_break = 0;
	    }
	    if (strcmp(argv[stat], "-freq") == 0)
		if ((stat + 1) < argc) {
		    freq = VAL(argv[++stat]);
		    printf_filtered(" ERC32 freq %d Mhz\n", freq);
		}
	} else
	    bfd_load(argv[stat]);
	stat++;
    }
    freeargv(argv);
    sregs.freq = freq;

    INIT_DISASSEMBLE_INFO(dinfo, stdout, fprintf);
    init_signals();
    reset_all();
    ebase.simtime = 0;
    init_sim();
    init_bpt(&sregs);
    reset_stat(&sregs);
}

void
sim_close(int quitting)
{

    exit_sim();

};

/* Return non-zero if the caller should handle the load. Zero if
     we have loaded the image. */
int
sim_load(char *prog, int from_tty)
{
    bfd_load(prog);
    return (0);
}

void
sim_create_inferior(int start_address, char **argv, char **env)
{
    ebase.simtime = 0;
    reset_all();
    reset_stat(&sregs);
    sregs.pc = start_address & ~3;
    sregs.npc = sregs.pc + 4;

}

void
sim_store_register(regno, value)
    int             regno;
    unsigned char  *value;
{
    /* FIXME: Review the computation of regval.  */
    int             regval = (value[0] << 24) | (value[1] << 16) | (value[2] << 8) | value[3];
    set_regi(&sregs, regno, regval);
}


void
sim_fetch_register(regno, buf)
    int             regno;
    unsigned char  *buf;
{
    get_regi(&sregs, regno, buf);
}

int
sim_write(mem, buf, length)
    int             mem;
    unsigned char  *buf;
    int             length;
{
    return (sis_memory_write(mem, buf, length));
}

int
sim_read(int mem, unsigned char *buf, int length)
{
    return (sis_memory_read(mem, buf, length));
}

void
sim_info(int verbose)
{
    show_stat(&sregs);


}

int             simstat = OK;

enum sim_stop {
    sim_exited, sim_stopped, sim_signalled
};

void
sim_stop_reason(enum sim_stop * reason, int *sigrc)
{

    switch (simstat) {
	case CTRL_C:
	*reason = sim_stopped;
	*sigrc = SIGINT;
	break;
    case OK:
    case TIME_OUT:
    case BPT_HIT:
	*reason = sim_stopped;
	*sigrc = SIGTRAP;
	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.
*/

#define PSR_CWP 0x7

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];

      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(int step, int siggnal)
{
    simstat = run_sim(&sregs, 1, 0, 0);

    flush_windows ();
}

void
sim_kill(void)
{
};



void
sim_do_command(cmd)
    char           *cmd;
{
    exec_cmd(&sregs, cmd);
}



int
sim_insert_breakpoint(int addr)
{
    if (sregs.bptnum < BPT_MAX) {
	sregs.bpts[sregs.bptnum] = addr & ~0x3;
	sregs.bptnum++;
	if (sis_verbose)
	    printf_filtered("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)
	    printf_filtered("removed HW BP at %x\n", addr);
	return 0;
    }
    return 1;
}