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6df01ab8ab
The defs.h header will take care of including the various config.h headers. For now, it's just config.h, but we'll add more when we integrate gnulib in. This header should be used instead of config.h, and should be the first include in every .c file. We won't rely on the old behavior where we expected files to include the port's sim-main.h which then includes the common sim-basics.h which then includes config.h. We have a ton of code that includes things before sim-main.h, and it sometimes needs to be that way. Creating a dedicated header avoids the ordering mess and implicit inclusion that shows up otherwise.
480 lines
11 KiB
C
480 lines
11 KiB
C
/* This file is part of SIS (SPARC instruction simulator)
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Copyright (C) 1995-2021 Free Software Foundation, Inc.
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Contributed by Jiri Gaisler, European Space Agency
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This must come before any other includes. */
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#include "defs.h"
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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 <stdlib.h>
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#include <sys/fcntl.h>
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#include "sis.h"
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#include "libiberty.h"
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#include "bfd.h"
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#include <dis-asm.h>
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#include "sim-config.h"
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#include "sim/sim.h"
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#include "gdb/signals.h"
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#define PSR_CWP 0x7
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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 ift;
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extern int rom8;
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extern int wrp;
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extern int uben;
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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 int sparclite;
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extern int dumbio;
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extern int sparclite_board;
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extern int termsave;
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extern char uart_dev1[], uart_dev2[];
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int sis_gdb_break = 1;
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host_callback *sim_callback;
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int
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run_sim(struct pstate *sregs, uint64 icount, int dis)
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{
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int mexc, irq;
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if (sis_verbose)
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(*sim_callback->printf_filtered) (sim_callback, "resuming at %x\n",
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sregs->pc);
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init_stdio();
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sregs->starttime = get_time();
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irq = 0;
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if ((sregs->pc != 0) && (ebase.simtime == 0))
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boot_init();
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while (!sregs->err_mode & (icount > 0)) {
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sregs->fhold = 0;
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sregs->hold = 0;
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sregs->icnt = 1;
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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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#if 0 /* DELETE ME! for debugging purposes only */
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if (sis_verbose > 1)
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if (sregs->pc == 0 || sregs->npc == 0)
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printf ("bogus pc or npc\n");
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#endif
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mexc = memory_iread (sregs->pc, &sregs->inst, &sregs->hold);
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#if 0 /* DELETE ME! for debugging purposes only */
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if (sis_verbose > 2)
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printf("pc %x, np %x, sp %x, fp %x, wm %x, cw %x, i %08x\n",
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sregs->pc, sregs->npc,
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sregs->r[(((sregs->psr & 7) << 4) + 14) & 0x7f],
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sregs->r[(((sregs->psr & 7) << 4) + 30) & 0x7f],
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sregs->wim,
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sregs->psr & 7,
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sregs->inst);
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#endif
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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 (ext_irl) irq = check_interrupts(sregs);
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if (!irq) {
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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 ((sis_gdb_break) && (sregs->inst == 0x91d02001)) {
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if (sis_verbose)
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(*sim_callback->printf_filtered) (sim_callback,
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"SW BP hit at %x\n", sregs->pc);
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sim_halt();
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restore_stdio();
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clearerr(stdin);
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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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irq = 0;
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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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icount = 0;
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}
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}
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sim_halt();
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sregs->tottime += get_time() - sregs->starttime;
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restore_stdio();
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clearerr(stdin);
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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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(*sim_callback->printf_filtered) (sim_callback,
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"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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SIM_DESC
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sim_open (SIM_OPEN_KIND kind, struct host_callback_struct *callback,
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struct bfd *abfd, char * const *argv)
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{
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int argc = 0;
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int stat = 1;
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int freq = 0;
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sim_callback = callback;
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argc = countargv (argv);
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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++;
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} else
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if (strcmp(argv[stat], "-nfp") == 0) {
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nfp = 1;
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} else
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if (strcmp(argv[stat], "-ift") == 0) {
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ift = 1;
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} else
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if (strcmp(argv[stat], "-sparclite") == 0) {
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sparclite = 1;
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} else
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if (strcmp(argv[stat], "-sparclite-board") == 0) {
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sparclite_board = 1;
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} else
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if (strcmp(argv[stat], "-dumbio") == 0) {
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dumbio = 1;
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} else
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if (strcmp(argv[stat], "-wrp") == 0) {
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wrp = 1;
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} else
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if (strcmp(argv[stat], "-rom8") == 0) {
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rom8 = 1;
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} else
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if (strcmp(argv[stat], "-uben") == 0) {
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uben = 1;
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} else
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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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} else
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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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} else
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if (strcmp(argv[stat], "-nogdb") == 0) {
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sis_gdb_break = 0;
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} else
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if (strcmp(argv[stat], "-freq") == 0) {
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if ((stat + 1) < argc) {
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freq = strtol(argv[++stat], (char **)NULL, 0);
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}
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} else
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if (strncmp(argv[stat], "--sysroot=", sizeof("--sysroot=") - 1) == 0) {
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/* Ignore until we start to support this. */
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} else {
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(*sim_callback->printf_filtered) (sim_callback,
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"unknown option %s\n",
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argv[stat]);
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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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if (sis_verbose) {
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(*sim_callback->printf_filtered) (sim_callback, "\n SIS - SPARC instruction simulator %s\n", sis_version);
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(*sim_callback->printf_filtered) (sim_callback, " Bug-reports to Jiri Gaisler ESA/ESTEC (jgais@wd.estec.esa.nl)\n");
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if (nfp)
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(*sim_callback->printf_filtered) (sim_callback, "no FPU\n");
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if (sparclite)
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(*sim_callback->printf_filtered) (sim_callback, "simulating Sparclite\n");
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if (dumbio)
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(*sim_callback->printf_filtered) (sim_callback, "dumb IO (no input, dumb output)\n");
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if (sis_gdb_break == 0)
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(*sim_callback->printf_filtered) (sim_callback, "disabling GDB trap handling for breakpoints\n");
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if (freq)
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(*sim_callback->printf_filtered) (sim_callback, " ERC32 freq %d Mhz\n", freq);
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}
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sregs.freq = freq ? freq : 15;
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termsave = fcntl(0, F_GETFL, 0);
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INIT_DISASSEMBLE_INFO(dinfo, stdout,(fprintf_ftype)fprintf);
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#ifdef HOST_LITTLE_ENDIAN
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dinfo.endian = BFD_ENDIAN_LITTLE;
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#else
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dinfo.endian = BFD_ENDIAN_BIG;
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#endif
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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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/* Fudge our descriptor for now. */
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return (SIM_DESC) 1;
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}
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void
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sim_close(SIM_DESC sd, int quitting)
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{
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exit_sim();
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fcntl(0, F_SETFL, termsave);
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};
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SIM_RC
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sim_load(SIM_DESC sd, const char *prog, bfd *abfd, int from_tty)
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{
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bfd_load (prog);
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return SIM_RC_OK;
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}
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SIM_RC
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sim_create_inferior(SIM_DESC sd, bfd *abfd, char * const *argv,
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char * const *env)
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{
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bfd_vma start_address = 0;
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if (abfd != NULL)
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start_address = bfd_get_start_address (abfd);
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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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return SIM_RC_OK;
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}
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int
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sim_store_register(SIM_DESC sd, int regno, unsigned char *value, int length)
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{
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int regval;
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regval = (value[0] << 24) | (value[1] << 16)
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| (value[2] << 8) | value[3];
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set_regi(&sregs, regno, regval);
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return length;
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}
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int
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sim_fetch_register(SIM_DESC sd, int regno, unsigned char *buf, int length)
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{
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get_regi(&sregs, regno, buf);
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return -1;
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}
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int
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sim_write (SIM_DESC sd, SIM_ADDR mem, const unsigned char *buf, int length)
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{
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int i, len;
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for (i = 0; i < length; i++) {
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sis_memory_write ((mem + i) ^ EBT, &buf[i], 1);
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}
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return length;
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}
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int
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sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
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{
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int i, len;
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for (i = 0; i < length; i++) {
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sis_memory_read ((mem + i) ^ EBT, &buf[i], 1);
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}
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return length;
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}
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void
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sim_info(SIM_DESC sd, 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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void
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sim_stop_reason(SIM_DESC sd, 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 = GDB_SIGNAL_INT;
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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 = GDB_SIGNAL_TRAP;
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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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static void
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flush_windows (void)
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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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#if 1
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if (sis_verbose > 2) {
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uint32 fp = sregs.r[(win * 16 + 30) & 0x7f];
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printf("flush_window: win %d, sp %x, fp %x\n", win, sp, fp);
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}
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#endif
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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(SIM_DESC sd, int step, int siggnal)
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{
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simstat = run_sim(&sregs, UINT64_MAX, 0);
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if (sis_gdb_break) flush_windows ();
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}
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void
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sim_do_command(SIM_DESC sd, const char *cmd)
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{
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exec_cmd(&sregs, cmd);
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}
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char **
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sim_complete_command (SIM_DESC sd, const char *text, const char *word)
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{
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return NULL;
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}
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char *
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sim_memory_map (SIM_DESC sd)
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{
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return NULL;
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}
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#if 0 /* FIXME: These shouldn't exist. */
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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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(*sim_callback->printf_filtered) (sim_callback, "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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(*sim_callback->printf_filtered) (sim_callback, "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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#endif
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