/* * 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" #ifndef fprintf extern fprintf(); #endif #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 = SIGINT; break; case OK: case TIME_OUT: case BPT_HIT: *reason = sim_stopped; #ifdef _WIN32 #define SIGTRAP 5 #endif *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. */ 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