427 lines
9.1 KiB
C
427 lines
9.1 KiB
C
/*
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* This file is part of SIS.
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*
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* SIS, SPARC instruction simulator V1.6 Copyright (C) 1995 Jiri Gaisler,
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* European Space Agency
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 675
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* Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <signal.h>
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#include <string.h>
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#include <stdio.h>
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#include "sis.h"
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#include "bfd.h"
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#include <dis-asm.h>
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#ifndef fprintf
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extern fprintf();
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#endif
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#define VAL(x) strtol(x,(char *)NULL,0)
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extern char **buildargv(char *input);
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extern struct disassemble_info dinfo;
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extern struct pstate sregs;
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extern struct estate ebase;
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extern int ctrl_c;
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extern int nfp;
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extern int sis_verbose;
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extern char *sis_version;
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extern struct estate ebase;
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extern struct evcell evbuf[];
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extern struct irqcell irqarr[];
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extern int irqpend, ext_irl;
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extern char uart_dev1[], uart_dev2[];
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int sis_gdb_break = 1;
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#ifdef IUREV0
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extern int iurev0;
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#endif
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#ifdef MECREV0
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extern int mecrev0;
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#endif
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run_sim(sregs, go, icount, dis)
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struct pstate *sregs;
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int go;
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unsigned int icount;
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int dis;
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{
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int mexc, ws;
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if (sis_verbose)
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printf_filtered("resuming at %x\n", sregs->pc);
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sregs->starttime = time(NULL);
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while ((!sregs->err_mode & (go || (icount > 0))) &&
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((sregs->bptnum == 0) || !(sregs->bphit = check_bpt(sregs)))) {
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sregs->fhold = 0;
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sregs->hold = 0;
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sregs->icnt = 0;
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check_interrupts(sregs);
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if (sregs->trap) {
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sregs->err_mode = execute_trap(sregs);
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} else {
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if (sregs->psr & 0x080)
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sregs->asi = 8;
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else
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sregs->asi = 9;
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#ifdef IUREV0
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if (iurev0 && sregs->rett_err) {
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sregs->asi &= ~0x1;
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sregs->asi |= ((sregs->psr & 0x040) >> 6);
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}
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#endif
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mexc = memory_read(sregs->asi, sregs->pc, &sregs->inst, &sregs->hold);
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if (sregs->annul) {
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sregs->annul = 0;
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sregs->icnt = 1;
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sregs->pc = sregs->npc;
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sregs->npc = sregs->npc + 4;
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} else {
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if (mexc) {
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sregs->trap = I_ACC_EXC;
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} else {
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if (sregs->histlen) {
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sregs->histbuf[sregs->histind].addr = sregs->pc;
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sregs->histbuf[sregs->histind].time = ebase.simtime;
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sregs->histind++;
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if (sregs->histind >= sregs->histlen)
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sregs->histind = 0;
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}
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if (dis) {
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printf(" %8d ", ebase.simtime);
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dis_mem(sregs->pc, 1, &dinfo);
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}
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if ((sis_gdb_break) && (sregs->inst == 0x91d02001)) {
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if (sis_verbose)
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printf_filtered("SW BP hit at %x\n", sregs->pc);
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return (BPT_HIT);
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} else
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dispatch_instruction(sregs);
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}
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icount--;
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}
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if (sregs->trap) {
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sregs->err_mode = execute_trap(sregs);
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}
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}
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advance_time(sregs);
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if (ctrl_c) {
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go = icount = 0;
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}
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}
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sregs->tottime += time(NULL) - sregs->starttime;
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if (sregs->err_mode)
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error_mode(sregs->pc);
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if (sregs->err_mode)
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return (ERROR);
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if (sregs->bphit) {
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if (sis_verbose)
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printf_filtered("HW BP hit at %x\n", sregs->pc);
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return (BPT_HIT);
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}
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if (ctrl_c) {
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ctrl_c = 0;
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return (CTRL_C);
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}
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return (TIME_OUT);
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}
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void
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sim_open(char *args)
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{
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int argc = 0;
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char **argv;
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int cont = 1;
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int stat = 0;
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int grdl = 0;
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int freq = 15;
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printf_filtered("\n SIS - SPARC instruction simulator %s\n", sis_version);
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printf_filtered(" Bug-reports to Jiri Gaisler ESA/ESTEC (jgais@wd.estec.esa.nl)\n");
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argv = buildargv(args);
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if (argv != NULL)
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while (argv[argc])
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argc++;
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while (stat < argc) {
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if (argv[stat][0] == '-') {
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if (strcmp(argv[stat], "-v") == 0) {
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sis_verbose = 1;
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}
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#ifdef IUREV0
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if (strcmp(argv[stat], "-iurev0") == 0) {
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iurev0 = 1;
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printf_filtered(" simulating IU rev.0 jmpl/restore bug\n");
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}
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#endif
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#ifdef MECREV0
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if (strcmp(argv[stat], "-mecrev0") == 0) {
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mecrev0 = 1;
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printf_filtered(" simulating MEC rev.0 timer and uart interrupt bug\n");
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}
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#endif
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if (strcmp(argv[stat], "-nfp") == 0) {
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printf_filtered("no FPU\n");
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nfp = 1;
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}
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if (strcmp(argv[stat], "-uart1") == 0) {
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if ((stat + 1) < argc)
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strcpy(uart_dev1, argv[++stat]);
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}
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if (strcmp(argv[stat], "-uart2") == 0) {
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if ((stat + 1) < argc)
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strcpy(uart_dev2, argv[++stat]);
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}
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if (strcmp(argv[stat], "-nogdb") == 0) {
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printf_filtered("disabling GDB trap handling for breakpoints\n");
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sis_gdb_break = 0;
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}
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if (strcmp(argv[stat], "-freq") == 0)
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if ((stat + 1) < argc) {
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freq = VAL(argv[++stat]);
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printf_filtered(" ERC32 freq %d Mhz\n", freq);
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}
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} else
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bfd_load(argv[stat]);
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stat++;
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}
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freeargv(argv);
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sregs.freq = freq;
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INIT_DISASSEMBLE_INFO(dinfo, stdout, fprintf);
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init_signals();
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reset_all();
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ebase.simtime = 0;
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init_sim();
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init_bpt(&sregs);
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reset_stat(&sregs);
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}
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void
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sim_close(int quitting)
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{
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exit_sim();
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};
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/* Return non-zero if the caller should handle the load. Zero if
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we have loaded the image. */
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int
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sim_load(char *prog, int from_tty)
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{
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bfd_load(prog);
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return (0);
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}
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void
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sim_create_inferior(int start_address, char **argv, char **env)
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{
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ebase.simtime = 0;
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reset_all();
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reset_stat(&sregs);
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sregs.pc = start_address & ~3;
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sregs.npc = sregs.pc + 4;
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}
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void
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sim_store_register(regno, value)
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int regno;
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unsigned char *value;
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{
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/* FIXME: Review the computation of regval. */
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int regval = (value[0] << 24) | (value[1] << 16) | (value[2] << 8) | value[3];
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set_regi(&sregs, regno, regval);
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}
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void
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sim_fetch_register(regno, buf)
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int regno;
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unsigned char *buf;
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{
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get_regi(&sregs, regno, buf);
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}
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int
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sim_write(mem, buf, length)
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int mem;
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unsigned char *buf;
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int length;
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{
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return (sis_memory_write(mem, buf, length));
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}
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int
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sim_read(int mem, unsigned char *buf, int length)
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{
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return (sis_memory_read(mem, buf, length));
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}
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void
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sim_info(int verbose)
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{
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show_stat(&sregs);
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}
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int simstat = OK;
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enum sim_stop {
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sim_exited, sim_stopped, sim_signalled
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};
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void
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sim_stop_reason(enum sim_stop * reason, int *sigrc)
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{
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switch (simstat) {
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case CTRL_C:
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*reason = sim_stopped;
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*sigrc = SIGINT;
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break;
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case OK:
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case TIME_OUT:
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case BPT_HIT:
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*reason = sim_stopped;
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*sigrc = SIGTRAP;
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break;
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case ERROR:
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*sigrc = 0;
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*reason = sim_exited;
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}
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ctrl_c = 0;
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simstat = OK;
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}
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/* Flush all register windows out to the stack. Starting after the invalid
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window, flush all windows up to, and including the current window. This
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allows GDB to do backtraces and look at local variables for frames that
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are still in the register windows. Note that strictly speaking, this
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behavior is *wrong* for several reasons. First, it doesn't use the window
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overflow handlers. It therefore assumes standard frame layouts and window
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handling policies. Second, it changes system state behind the back of the
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target program. I expect this to mainly pose problems when debugging trap
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handlers.
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*/
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#define PSR_CWP 0x7
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static void
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flush_windows ()
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{
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int invwin;
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int cwp;
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int win;
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int ws;
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/* Keep current window handy */
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cwp = sregs.psr & PSR_CWP;
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/* Calculate the invalid window from the wim. */
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for (invwin = 0; invwin <= PSR_CWP; invwin++)
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if ((sregs.wim >> invwin) & 1)
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break;
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/* Start saving with the window after the invalid window. */
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invwin = (invwin - 1) & PSR_CWP;
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for (win = invwin; ; win = (win - 1) & PSR_CWP)
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{
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uint32 sp;
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int i;
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sp = sregs.r[(win * 16 + 14) & 0x7f];
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for (i = 0; i < 16; i++)
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memory_write (11, sp + 4 * i, &sregs.r[(win * 16 + 16 + i) & 0x7f], 2,
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&ws);
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if (win == cwp)
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break;
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}
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}
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void
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sim_resume(int step, int siggnal)
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{
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simstat = run_sim(&sregs, 1, 0, 0);
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flush_windows ();
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}
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void
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sim_kill(void)
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{
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};
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void
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sim_do_command(cmd)
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char *cmd;
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{
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exec_cmd(&sregs, cmd);
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}
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int
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sim_insert_breakpoint(int addr)
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{
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if (sregs.bptnum < BPT_MAX) {
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sregs.bpts[sregs.bptnum] = addr & ~0x3;
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sregs.bptnum++;
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if (sis_verbose)
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printf_filtered("inserted HW BP at %x\n", addr);
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return 0;
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} else
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return 1;
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}
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int
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sim_remove_breakpoint(int addr)
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{
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int i = 0;
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while ((i < sregs.bptnum) && (sregs.bpts[i] != addr))
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i++;
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if (addr == sregs.bpts[i]) {
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for (; i < sregs.bptnum - 1; i++)
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sregs.bpts[i] = sregs.bpts[i + 1];
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sregs.bptnum -= 1;
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if (sis_verbose)
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printf_filtered("removed HW BP at %x\n", addr);
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return 0;
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}
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return 1;
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}
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