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[/] [eco32/] [tags/] [eco32-0.25/] [sim/] [command.c] - Blame information for rev 8

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/*
 * command.c -- command interpreter
 */
 
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
 
#include "common.h"
#include "console.h"
#include "error.h"
#include "except.h"
#include "command.h"
#include "asm.h"
#include "disasm.h"
#include "cpu.h"
#include "mmu.h"
#include "memory.h"
#include "timer.h"
#include "dspkbd.h"
#include "term.h"
#include "disk.h"
#include "graph.h"
 
 
#define MAX_TOKENS      10
 
 
static Bool quit;
 
 
static void help(void) {
  cPrintf("valid commands are:\n");
  cPrintf("  +  <num1> <num2>  add and subtract <num1> and <num2>\n");
  cPrintf("  a                 assemble starting at PC\n");
  cPrintf("  a  <addr>         assemble starting at <addr>\n");
  cPrintf("  u                 unassemble 16 instrs starting at PC\n");
  cPrintf("  u  <addr>         unassemble 16 instrs starting at <addr>\n");
  cPrintf("  u  <addr> <cnt>   unassemble <cnt> instrs starting at <addr>\n");
  cPrintf("  b                 reset break\n");
  cPrintf("  b  <addr>         set break at <addr>\n");
  cPrintf("  c                 continue execution\n");
  cPrintf("  c  <cnt>          continue execution <cnt> times\n");
  cPrintf("  s                 single-step one instruction\n");
  cPrintf("  s  <cnt>          single-step <cnt> instructions\n");
  cPrintf("  @                 show PC\n");
  cPrintf("  @  <addr>         set PC to <addr>\n");
  cPrintf("  p                 show PSW\n");
  cPrintf("  p  <data>         set PSW to <data>\n");
  cPrintf("  r                 show all registers\n");
  cPrintf("  r  <reg>          show register <reg>\n");
  cPrintf("  r  <reg> <data>   set register <reg> to <data>\n");
  cPrintf("  d                 dump 256 bytes starting at PC\n");
  cPrintf("  d  <addr>         dump 256 bytes starting at <addr>\n");
  cPrintf("  d  <addr> <cnt>   dump <cnt> bytes starting at <addr>\n");
  cPrintf("  mw                show memory word at PC\n");
  cPrintf("  mw <addr>         show memory word at <addr>\n");
  cPrintf("  mw <addr> <data>  set memory word at <addr> to <data>\n");
  cPrintf("  mh                show memory halfword at PC\n");
  cPrintf("  mh <addr>         show memory halfword at <addr>\n");
  cPrintf("  mh <addr> <data>  set memory halfword at <addr> to <data>\n");
  cPrintf("  mb                show memory byte at PC\n");
  cPrintf("  mb <addr>         show memory byte at <addr>\n");
  cPrintf("  mb <addr> <data>  set memory byte at <addr> to <data>\n");
  cPrintf("  t                 show TLB contents\n");
  cPrintf("  t  <i>            show TLB contents at <i>\n");
  cPrintf("  t  <i> p <data>   set TLB contents at <i> to page <data>\n");
  cPrintf("  t  <i> f <data>   set TLB contents at <i> to frame <data>\n");
  cPrintf("  i                 initialize hardware\n");
  cPrintf("  q                 quit simulator\n");
}
 
 
static char *cause[32] = {
  /*  0 */  "terminal 0 transmitter interrupt",
  /*  1 */  "terminal 0 receiver interrupt",
  /*  2 */  "terminal 1 transmitter interrupt",
  /*  3 */  "terminal 1 receiver interrupt",
  /*  4 */  "keyboard interrupt",
  /*  5 */  "unknown interrupt",
  /*  6 */  "unknown interrupt",
  /*  7 */  "unknown interrupt",
  /*  8 */  "disk interrupt",
  /*  9 */  "unknown interrupt",
  /* 10 */  "unknown interrupt",
  /* 11 */  "unknown interrupt",
  /* 12 */  "unknown interrupt",
  /* 13 */  "unknown interrupt",
  /* 14 */  "timer interrupt",
  /* 15 */  "unknown interrupt",
  /* 16 */  "bus timeout exception",
  /* 17 */  "illegal instruction exception",
  /* 18 */  "privileged instruction exception",
  /* 19 */  "divide instruction exception",
  /* 20 */  "trap instruction exception",
  /* 21 */  "TLB miss exception",
  /* 22 */  "TLB write exception",
  /* 23 */  "TLB invalid exception",
  /* 24 */  "illegal address exception",
  /* 25 */  "privileged address exception",
  /* 26 */  "unknown exception",
  /* 27 */  "unknown exception",
  /* 28 */  "unknown exception",
  /* 29 */  "unknown exception",
  /* 30 */  "unknown exception",
  /* 31 */  "unknown exception"
};
 
 
static char *exceptionToString(int exception) {
  if (exception < 0 ||
      exception >= sizeof(cause)/sizeof(cause[0])) {
    error("exception number out of bounds");
  }
  return cause[exception];
}
 
 
static Bool getHexNumber(char *str, Word *valptr) {
  char *end;
 
  *valptr = strtoul(str, &end, 16);
  return *end == '\0';
}
 
 
static Bool getDecNumber(char *str, int *valptr) {
  char *end;
 
  *valptr = strtoul(str, &end, 10);
  return *end == '\0';
}
 
 
static void showPC(void) {
  Word pc, psw;
  Word instr;
 
  pc = cpuGetPC();
  psw = cpuGetPSW();
  instr = mmuReadWord(pc, psw & PSW_UM);
  cPrintf("PC   %08X     [PC]   %08X   %s\n",
          pc, instr, disasm(instr, pc));
}
 
 
static void showBreakAndTotal(void) {
  Word brk;
  Word tot;
 
  brk = cpuGetBreak();
  tot = cpuGetTotal();
  cPrintf("Brk  ");
  if (cpuTestBreak()) {
    cPrintf("%08X", brk);
  } else {
    cPrintf("--------");
  }
  cPrintf("     Total  %08X   instructions\n", tot);
}
 
 
static void showIRQ(void) {
  Word irq;
  int i;
 
  irq = cpuGetIRQ();
  cPrintf("IRQ                            ");
  for (i = 15; i >= 0; i--) {
    cPrintf("%c", irq & (1 << i) ? '1' : '0');
  }
  cPrintf("\n");
}
 
 
static void showPSW(void) {
  Word psw;
  int i;
 
  psw = cpuGetPSW();
  cPrintf("     xxxx  V  UPO  IPO  IACK   MASK\n");
  cPrintf("PSW  ");
  for (i = 31; i >= 0; i--) {
    if (i == 27 || i == 26 || i == 23 || i == 20 || i == 15) {
      cPrintf("  ");
    }
    cPrintf("%c", psw & (1 << i) ? '1' : '0');
  }
  cPrintf("\n");
}
 
 
static void doArith(char *tokens[], int n) {
  Word num1, num2, num3, num4;
 
  if (n == 3) {
    if (!getHexNumber(tokens[1], &num1)) {
      cPrintf("illegal first number\n");
      return;
    }
    if (!getHexNumber(tokens[2], &num2)) {
      cPrintf("illegal second number\n");
      return;
    }
    num3 = num1 + num2;
    num4 = num1 - num2;
    cPrintf("add = %08X, sub = %08X\n", num3, num4);
  } else {
    help();
  }
}
 
 
static void doAssemble(char *tokens[], int n) {
  Word addr;
  Word psw;
  char prompt[30];
  char *line;
  char *msg;
  Word instr;
 
  if (n == 1) {
    addr = cpuGetPC();
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
  } else {
    help();
    return;
  }
  addr &= ~0x00000003;
  psw = cpuGetPSW();
  while (1) {
    sprintf(prompt, "ASM @ %08X: ", addr);
    line = cGetLine(prompt);
    if (*line == '\0' || *line == '\n') {
      break;
    }
    cAddHist(line);
    msg = asmInstr(line, addr, &instr);
    if (msg != NULL) {
      cPrintf("%s\n", msg);
    } else {
      mmuWriteWord(addr, instr, psw & PSW_UM);
      addr += 4;
    }
  }
}
 
 
static void doUnassemble(char *tokens[], int n) {
  Word addr, count;
  Word psw;
  int i;
  Word instr;
 
  if (n == 1) {
    addr = cpuGetPC();
    count = 16;
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    count = 16;
  } else if (n == 3) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    if (!getHexNumber(tokens[2], &count)) {
      cPrintf("illegal count\n");
      return;
    }
    if (count == 0) {
      return;
    }
  } else {
    help();
    return;
  }
  addr &= ~0x00000003;
  psw = cpuGetPSW();
  for (i = 0; i < count; i++) {
    instr = mmuReadWord(addr, psw & PSW_UM);
    cPrintf("%08X:  %08X    %s\n",
            addr, instr, disasm(instr, addr));
    if (addr + 4 < addr) {
      /* wrap-around */
      break;
    }
    addr += 4;
  }
}
 
 
static void doBreak(char *tokens[], int n) {
  Word addr;
 
  if (n == 1) {
    cpuResetBreak();
    showBreakAndTotal();
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    addr &= ~0x00000003;
    cpuSetBreak(addr);
    showBreakAndTotal();
  } else {
    help();
  }
}
 
 
static void doContinue(char *tokens[], int n) {
  Word count, i;
  Word addr;
 
  if (n == 1) {
    count = 1;
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &count) || count == 0) {
      cPrintf("illegal count\n");
      return;
    }
  } else {
    help();
    return;
  }
  cPrintf("CPU is running, press ^C to interrupt...\n");
  for (i = 0; i < count; i++) {
    cpuRun();
  }
  addr = cpuGetPC();
  cPrintf("Break at %08X\n", addr);
  showPC();
}
 
 
static void doStep(char *tokens[], int n) {
  Word count, i;
 
  if (n == 1) {
    count = 1;
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &count) || count == 0) {
      cPrintf("illegal count\n");
      return;
    }
  } else {
    help();
    return;
  }
  for (i = 0; i < count; i++) {
    cpuStep();
  }
  showPC();
}
 
 
static void doPC(char *tokens[], int n) {
  Word addr;
 
  if (n == 1) {
    showPC();
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    addr &= ~0x00000003;
    cpuSetPC(addr);
    showPC();
  } else {
    help();
  }
}
 
 
static void explainPSW(Word data) {
  int i;
 
  cPrintf("interrupt vector                   : %s (%s)\n",
          data & PSW_V ? "on " : "off",
          data & PSW_V ? "RAM" : "ROM");
  cPrintf("current user mode                  : %s (%s)\n",
          data & PSW_UM ? "on " : "off",
          data & PSW_UM ? "user" : "kernel");
  cPrintf("previous user mode                 : %s (%s)\n",
          data & PSW_PUM ? "on " : "off",
          data & PSW_PUM ? "user" : "kernel");
  cPrintf("old user mode                      : %s (%s)\n",
          data & PSW_OUM ? "on " : "off",
          data & PSW_OUM ? "user" : "kernel");
  cPrintf("current interrupt enable           : %s (%s)\n",
          data & PSW_IE ? "on " : "off",
          data & PSW_IE ? "enabled" : "disabled");
  cPrintf("previous interrupt enable          : %s (%s)\n",
          data & PSW_PIE ? "on " : "off",
          data & PSW_PIE ? "enabled" : "disabled");
  cPrintf("old interrupt enable               : %s (%s)\n",
          data & PSW_OIE ? "on " : "off",
          data & PSW_OIE ? "enabled" : "disabled");
  cPrintf("last interrupt acknowledged        : %02X  (%s)\n",
          (data & PSW_PRIO_MASK) >> 16,
          exceptionToString((data & PSW_PRIO_MASK) >> 16));
  for (i = 15; i >= 0; i--) {
    cPrintf("%-35s: %s (%s)\n",
            exceptionToString(i),
            data & (1 << i) ? "on " : "off",
            data & (1 << i) ? "enabled" : "disabled");
  }
}
 
 
static void doPSW(char *tokens[], int n) {
  Word data;
 
  if (n == 1) {
    data = cpuGetPSW();
    showPSW();
    showIRQ();
    explainPSW(data);
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &data)) {
      cPrintf("illegal data\n");
      return;
    }
    data &= 0x0FFFFFFF;
    cpuSetPSW(data);
    showPSW();
    showIRQ();
    explainPSW(data);
  } else {
    help();
  }
}
 
 
static void doRegister(char *tokens[], int n) {
  int i, j;
  int reg;
  Word data;
 
  if (n == 1) {
    for (i = 0; i < 8; i++) {
      for (j = 0; j < 4; j++) {
        reg = 8 * j + i;
        data = cpuGetReg(reg);
        cPrintf("$%-2d  %08X     ", reg, data);
      }
      cPrintf("\n");
    }
    showPSW();
    showIRQ();
    showBreakAndTotal();
    showPC();
  } else if (n == 2) {
    if (!getDecNumber(tokens[1], &reg) || reg < 0 || reg >= 32) {
      cPrintf("illegal register number\n");
      return;
    }
    data = cpuGetReg(reg);
    cPrintf("$%-2d  %08X\n", reg, data);
  } else if (n == 3) {
    if (!getDecNumber(tokens[1], &reg) || reg < 0 || reg >= 32) {
      cPrintf("illegal register number\n");
      return;
    }
    if (!getHexNumber(tokens[2], &data)) {
      cPrintf("illegal data\n");
      return;
    }
    cpuSetReg(reg, data);
  } else {
    help();
  }
}
 
 
static void doDump(char *tokens[], int n) {
  Word addr, count;
  Word psw;
  Word lo, hi, curr;
  int lines, i, j;
  Word tmp;
  Byte c;
 
  if (n == 1) {
    addr = cpuGetPC();
    count = 16 * 16;
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    count = 16 * 16;
  } else if (n == 3) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    if (!getHexNumber(tokens[2], &count)) {
      cPrintf("illegal count\n");
      return;
    }
    if (count == 0) {
      return;
    }
  } else {
    help();
    return;
  }
  psw = cpuGetPSW();
  lo = addr & ~0x0000000F;
  hi = addr + count - 1;
  if (hi < lo) {
    /* wrap-around */
    hi = 0xFFFFFFFF;
  }
  lines = (hi - lo + 16) >> 4;
  curr = lo;
  for (i = 0; i < lines; i++) {
    cPrintf("%08X:  ", curr);
    for (j = 0; j < 16; j++) {
      tmp = curr + j;
      if (tmp < addr || tmp > hi) {
        cPrintf("  ");
      } else {
        c = mmuReadByte(tmp, psw & PSW_UM);
        cPrintf("%02X", c);
      }
      cPrintf(" ");
    }
    cPrintf("  ");
    for (j = 0; j < 16; j++) {
      tmp = curr + j;
      if (tmp < addr || tmp > hi) {
        cPrintf(" ");
      } else {
        c = mmuReadByte(tmp, psw & PSW_UM);
        if (c >= 32 && c <= 126) {
          cPrintf("%c", c);
        } else {
          cPrintf(".");
        }
      }
    }
    cPrintf("\n");
    curr += 16;
  }
}
 
 
static void doMemoryWord(char *tokens[], int n) {
  Word psw;
  Word addr;
  Word data;
  Word tmpData;
 
  psw = cpuGetPSW();
  if (n == 1) {
    addr = cpuGetPC();
    data = mmuReadWord(addr, psw & PSW_UM);
    cPrintf("%08X:  %08X\n", addr, data);
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    data = mmuReadWord(addr, psw & PSW_UM);
    cPrintf("%08X:  %08X\n", addr, data);
  } else if (n == 3) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    if (!getHexNumber(tokens[2], &tmpData)) {
      cPrintf("illegal data\n");
      return;
    }
    data = tmpData;
    mmuWriteWord(addr, data, psw & PSW_UM);
  } else {
    help();
  }
}
 
 
static void doMemoryHalf(char *tokens[], int n) {
  Word psw;
  Word addr;
  Half data;
  Word tmpData;
 
  psw = cpuGetPSW();
  if (n == 1) {
    addr = cpuGetPC();
    data = mmuReadHalf(addr, psw & PSW_UM);
    cPrintf("%08X:  %04X\n", addr, data);
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    data = mmuReadHalf(addr, psw & PSW_UM);
    cPrintf("%08X:  %04X\n", addr, data);
  } else if (n == 3) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    if (!getHexNumber(tokens[2], &tmpData)) {
      cPrintf("illegal data\n");
      return;
    }
    data = (Half) tmpData;
    mmuWriteHalf(addr, data, psw & PSW_UM);
  } else {
    help();
  }
}
 
 
static void doMemoryByte(char *tokens[], int n) {
  Word psw;
  Word addr;
  Byte data;
  Word tmpData;
 
  psw = cpuGetPSW();
  if (n == 1) {
    addr = cpuGetPC();
    data = mmuReadByte(addr, psw & PSW_UM);
    cPrintf("%08X:  %02X\n", addr, data);
  } else if (n == 2) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    data = mmuReadByte(addr, psw & PSW_UM);
    cPrintf("%08X:  %02X\n", addr, data);
  } else if (n == 3) {
    if (!getHexNumber(tokens[1], &addr)) {
      cPrintf("illegal address\n");
      return;
    }
    if (!getHexNumber(tokens[2], &tmpData)) {
      cPrintf("illegal data\n");
      return;
    }
    data = (Byte) tmpData;
    mmuWriteByte(addr, data, psw & PSW_UM);
  } else {
    help();
  }
}
 
 
static void doTLB(char *tokens[], int n) {
  int index;
  TLB_Entry tlbEntry;
  Word data;
 
  if (n == 1) {
    for (index = 0; index < TLB_SIZE; index++) {
      tlbEntry = mmuGetTLB(index);
      cPrintf("TLB[%02d]    page  %08X    frame  %08X  %c  %c\n",
              index, tlbEntry.page, tlbEntry.frame,
              tlbEntry.write ? 'w' : '-',
              tlbEntry.valid ? 'v' : '-');
    }
    cPrintf("Index(1)   %08X\n", mmuGetIndex());
    cPrintf("EntryHi(2) %08X\n", mmuGetEntryHi());
    cPrintf("EntryLo(3) %08X\n", mmuGetEntryLo());
    cPrintf("BadAddr(4) %08X\n", mmuGetBadAddr());
  } else if (n == 2) {
    if (!getDecNumber(tokens[1], &index) || index < 0 || index >= TLB_SIZE) {
      cPrintf("illegal TLB index\n");
      return;
    }
    tlbEntry = mmuGetTLB(index);
    cPrintf("TLB[%02d]    page  %08X    frame  %08X  %c  %c\n",
            index, tlbEntry.page, tlbEntry.frame,
            tlbEntry.write ? 'w' : '-',
            tlbEntry.valid ? 'v' : '-');
  } else if (n == 3) {
    help();
  } else if (n == 4) {
    if (!getDecNumber(tokens[1], &index) || index < 0 || index >= TLB_SIZE) {
      cPrintf("illegal TLB index\n");
      return;
    }
    if (!getHexNumber(tokens[3], &data)) {
      cPrintf("illegal data\n");
      return;
    }
    tlbEntry = mmuGetTLB(index);
    if (strcmp(tokens[2], "p") == 0) {
      tlbEntry.page = data & PAGE_MASK;
    } else
    if (strcmp(tokens[2], "f") == 0) {
      tlbEntry.frame = data & PAGE_MASK;
      tlbEntry.write = data & TLB_WRITE ? true : false;
      tlbEntry.valid = data & TLB_VALID ? true : false;
    } else {
      cPrintf("TLB selector is not one of 'p' or 'f'\n");
      return;
    }
    mmuSetTLB(index, tlbEntry);
    cPrintf("TLB[%02d]    page  %08X    frame  %08X  %c  %c\n",
            index, tlbEntry.page, tlbEntry.frame,
            tlbEntry.write ? 'w' : '-',
            tlbEntry.valid ? 'v' : '-');
  } else {
    help();
  }
}
 
 
static void doInit(char *tokens[], int n) {
  if (n == 1) {
    timerReset();
    displayReset();
    keyboardReset();
    termReset();
    diskReset();
    graphReset();
    memoryReset();
    mmuReset();
    cpuReset();
  } else {
    help();
  }
}
 
 
static void doQuit(char *tokens[], int n) {
  if (n == 1) {
    quit = true;
  } else {
    help();
  }
}
 
 
typedef struct {
  char *name;
  void (*cmdProc)(char *tokens[], int n);
} Command;
 
 
static Command commands[] = {
  { "+",  doArith },
  { "a",  doAssemble },
  { "u",  doUnassemble },
  { "b",  doBreak },
  { "c",  doContinue },
  { "s",  doStep },
  { "@",  doPC },
  { "p",  doPSW },
  { "r",  doRegister },
  { "d",  doDump },
  { "mw", doMemoryWord },
  { "mh", doMemoryHalf },
  { "mb", doMemoryByte },
  { "t",  doTLB },
  { "i",  doInit },
  { "q",  doQuit }
};
 
 
static Bool doCommand(char *line) {
  char *tokens[MAX_TOKENS];
  int n;
  char *p;
  int i;
 
  n = 0;
  p = strtok(line, " \t\n");
  while (p != NULL) {
    if (n == MAX_TOKENS) {
      cPrintf("too many tokens on line\n");
      return false;
    }
    tokens[n++] = p;
    p = strtok(NULL, " \t\n");
  }
  if (n == 0) {
    return false;
  }
  quit = false;
  for (i = 0; i < sizeof(commands)/sizeof(commands[0]); i++) {
    if (strcmp(commands[i].name, tokens[0]) == 0) {
      (*commands[i].cmdProc)(tokens, n);
      return quit;
    }
  }
  help();
  return false;
}
 
 
static char *article(char firstLetterOfNoun) {
  switch (firstLetterOfNoun) {
    case 'a':
    case 'e':
    case 'i':
    case 'o':
    case 'u':
      return "An";
    default:
      return "A";
  }
}
 
 
static void interactiveException(int exception) {
  char *what;
 
  what = exceptionToString(exception);
  cPrintf("\n");
  cPrintf("NOTE: %s %s occurred while executing the command.\n",
          article(*what), what);
  cPrintf("      This event will not alter the state of the CPU.\n");
}
 
 
Bool execCommand(char *line) {
  jmp_buf myEnvironment;
  int exception;
  Bool quit;
 
  exception = setjmp(myEnvironment);
  if (exception == 0) {
    /* initialization */
    pushEnvironment(&myEnvironment);
    quit = doCommand(line);
  } else {
    /* an exception was thrown */
    interactiveException(exception);
    quit = false;
  }
  popEnvironment();
  return quit;
}

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[/] [eco32/] [tags/] [eco32-0.25/] [sim/] [command.c] - Blame information for rev 8

Line No.	Rev	Author	Line
1	8	hellwig	`/*`
2			`* command.c -- command interpreter`
3			`*/`
4
5
6			`#include <stdio.h>`
7			`#include <stdlib.h>`
8			`#include <string.h>`
9			`#include <setjmp.h>`
10
11			`#include "common.h"`
12			`#include "console.h"`
13			`#include "error.h"`
14			`#include "except.h"`
15			`#include "command.h"`
16			`#include "asm.h"`
17			`#include "disasm.h"`
18			`#include "cpu.h"`
19			`#include "mmu.h"`
20			`#include "memory.h"`
21			`#include "timer.h"`
22			`#include "dspkbd.h"`
23			`#include "term.h"`
24			`#include "disk.h"`
25			`#include "graph.h"`
26
27
28			`#define MAX_TOKENS 10`
29
30
31			`static Bool quit;`
32
33
34			`static void help(void) {`
35			`cPrintf("valid commands are:\n");`
36			`cPrintf(" + <num1> <num2> add and subtract <num1> and <num2>\n");`
37			`cPrintf(" a assemble starting at PC\n");`
38			`cPrintf(" a <addr> assemble starting at <addr>\n");`
39			`cPrintf(" u unassemble 16 instrs starting at PC\n");`
40			`cPrintf(" u <addr> unassemble 16 instrs starting at <addr>\n");`
41			`cPrintf(" u <addr> <cnt> unassemble <cnt> instrs starting at <addr>\n");`
42			`cPrintf(" b reset break\n");`
43			`cPrintf(" b <addr> set break at <addr>\n");`
44			`cPrintf(" c continue execution\n");`
45			`cPrintf(" c <cnt> continue execution <cnt> times\n");`
46			`cPrintf(" s single-step one instruction\n");`
47			`cPrintf(" s <cnt> single-step <cnt> instructions\n");`
48			`cPrintf(" @ show PC\n");`
49			`cPrintf(" @ <addr> set PC to <addr>\n");`
50			`cPrintf(" p show PSW\n");`
51			`cPrintf(" p <data> set PSW to <data>\n");`
52			`cPrintf(" r show all registers\n");`
53			`cPrintf(" r <reg> show register <reg>\n");`
54			`cPrintf(" r <reg> <data> set register <reg> to <data>\n");`
55			`cPrintf(" d dump 256 bytes starting at PC\n");`
56			`cPrintf(" d <addr> dump 256 bytes starting at <addr>\n");`
57			`cPrintf(" d <addr> <cnt> dump <cnt> bytes starting at <addr>\n");`
58			`cPrintf(" mw show memory word at PC\n");`
59			`cPrintf(" mw <addr> show memory word at <addr>\n");`
60			`cPrintf(" mw <addr> <data> set memory word at <addr> to <data>\n");`
61			`cPrintf(" mh show memory halfword at PC\n");`
62			`cPrintf(" mh <addr> show memory halfword at <addr>\n");`
63			`cPrintf(" mh <addr> <data> set memory halfword at <addr> to <data>\n");`
64			`cPrintf(" mb show memory byte at PC\n");`
65			`cPrintf(" mb <addr> show memory byte at <addr>\n");`
66			`cPrintf(" mb <addr> <data> set memory byte at <addr> to <data>\n");`
67			`cPrintf(" t show TLB contents\n");`
68			`cPrintf(" t <i> show TLB contents at <i>\n");`
69			`cPrintf(" t <i> p <data> set TLB contents at <i> to page <data>\n");`
70			`cPrintf(" t <i> f <data> set TLB contents at <i> to frame <data>\n");`
71			`cPrintf(" i initialize hardware\n");`
72			`cPrintf(" q quit simulator\n");`
73			`}`
74
75
76			`static char *cause[32] = {`
77			`/* 0 */ "terminal 0 transmitter interrupt",`
78			`/* 1 */ "terminal 0 receiver interrupt",`
79			`/* 2 */ "terminal 1 transmitter interrupt",`
80			`/* 3 */ "terminal 1 receiver interrupt",`
81			`/* 4 */ "keyboard interrupt",`
82			`/* 5 */ "unknown interrupt",`
83			`/* 6 */ "unknown interrupt",`
84			`/* 7 */ "unknown interrupt",`
85			`/* 8 */ "disk interrupt",`
86			`/* 9 */ "unknown interrupt",`
87			`/* 10 */ "unknown interrupt",`
88			`/* 11 */ "unknown interrupt",`
89			`/* 12 */ "unknown interrupt",`
90			`/* 13 */ "unknown interrupt",`
91			`/* 14 */ "timer interrupt",`
92			`/* 15 */ "unknown interrupt",`
93			`/* 16 */ "bus timeout exception",`
94			`/* 17 */ "illegal instruction exception",`
95			`/* 18 */ "privileged instruction exception",`
96			`/* 19 */ "divide instruction exception",`
97			`/* 20 */ "trap instruction exception",`
98			`/* 21 */ "TLB miss exception",`
99			`/* 22 */ "TLB write exception",`
100			`/* 23 */ "TLB invalid exception",`
101			`/* 24 */ "illegal address exception",`
102			`/* 25 */ "privileged address exception",`
103			`/* 26 */ "unknown exception",`
104			`/* 27 */ "unknown exception",`
105			`/* 28 */ "unknown exception",`
106			`/* 29 */ "unknown exception",`
107			`/* 30 */ "unknown exception",`
108			`/* 31 */ "unknown exception"`
109			`};`
110
111
112			`static char *exceptionToString(int exception) {`
113			`if (exception < 0 \|\|`
114			`exception >= sizeof(cause)/sizeof(cause[0])) {`
115			`error("exception number out of bounds");`
116			`}`
117			`return cause[exception];`
118			`}`
119
120
121			`static Bool getHexNumber(char str, Word valptr) {`
122			`char *end;`
123
124			`*valptr = strtoul(str, &end, 16);`
125			`return *end == '\0';`
126			`}`
127
128
129			`static Bool getDecNumber(char str, int valptr) {`
130			`char *end;`
131
132			`*valptr = strtoul(str, &end, 10);`
133			`return *end == '\0';`
134			`}`
135
136
137			`static void showPC(void) {`
138			`Word pc, psw;`
139			`Word instr;`
140
141			`pc = cpuGetPC();`
142			`psw = cpuGetPSW();`
143			`instr = mmuReadWord(pc, psw & PSW_UM);`
144			`cPrintf("PC %08X [PC] %08X %s\n",`
145			`pc, instr, disasm(instr, pc));`
146			`}`
147
148
149			`static void showBreakAndTotal(void) {`
150			`Word brk;`
151			`Word tot;`
152
153			`brk = cpuGetBreak();`
154			`tot = cpuGetTotal();`
155			`cPrintf("Brk ");`
156			`if (cpuTestBreak()) {`
157			`cPrintf("%08X", brk);`
158			`} else {`
159			`cPrintf("--------");`
160			`}`
161			`cPrintf(" Total %08X instructions\n", tot);`
162			`}`
163
164
165			`static void showIRQ(void) {`
166			`Word irq;`
167			`int i;`
168
169			`irq = cpuGetIRQ();`
170			`cPrintf("IRQ ");`
171			`for (i = 15; i >= 0; i--) {`
172			`cPrintf("%c", irq & (1 << i) ? '1' : '0');`
173			`}`
174			`cPrintf("\n");`
175			`}`
176
177
178			`static void showPSW(void) {`
179			`Word psw;`
180			`int i;`
181
182			`psw = cpuGetPSW();`
183			`cPrintf(" xxxx V UPO IPO IACK MASK\n");`
184			`cPrintf("PSW ");`
185			`for (i = 31; i >= 0; i--) {`
186			`if (i == 27 \|\| i == 26 \|\| i == 23 \|\| i == 20 \|\| i == 15) {`
187			`cPrintf(" ");`
188			`}`
189			`cPrintf("%c", psw & (1 << i) ? '1' : '0');`
190			`}`
191			`cPrintf("\n");`
192			`}`
193
194
195			`static void doArith(char *tokens[], int n) {`
196			`Word num1, num2, num3, num4;`
197
198			`if (n == 3) {`
199			`if (!getHexNumber(tokens[1], &num1)) {`
200			`cPrintf("illegal first number\n");`
201			`return;`
202			`}`
203			`if (!getHexNumber(tokens[2], &num2)) {`
204			`cPrintf("illegal second number\n");`
205			`return;`
206			`}`
207			`num3 = num1 + num2;`
208			`num4 = num1 - num2;`
209			`cPrintf("add = %08X, sub = %08X\n", num3, num4);`
210			`} else {`
211			`help();`
212			`}`
213			`}`
214
215
216			`static void doAssemble(char *tokens[], int n) {`
217			`Word addr;`
218			`Word psw;`
219			`char prompt[30];`
220			`char *line;`
221			`char *msg;`
222			`Word instr;`
223
224			`if (n == 1) {`
225			`addr = cpuGetPC();`
226			`} else if (n == 2) {`
227			`if (!getHexNumber(tokens[1], &addr)) {`
228			`cPrintf("illegal address\n");`
229			`return;`
230			`}`
231			`} else {`
232			`help();`
233			`return;`
234			`}`
235			`addr &= ~0x00000003;`
236			`psw = cpuGetPSW();`
237			`while (1) {`
238			`sprintf(prompt, "ASM @ %08X: ", addr);`
239			`line = cGetLine(prompt);`
240			`if (line == '\0' \|\| line == '\n') {`
241			`break;`
242			`}`
243			`cAddHist(line);`
244			`msg = asmInstr(line, addr, &instr);`
245			`if (msg != NULL) {`
246			`cPrintf("%s\n", msg);`
247			`} else {`
248			`mmuWriteWord(addr, instr, psw & PSW_UM);`
249			`addr += 4;`
250			`}`
251			`}`
252			`}`
253
254
255			`static void doUnassemble(char *tokens[], int n) {`
256			`Word addr, count;`
257			`Word psw;`
258			`int i;`
259			`Word instr;`
260
261			`if (n == 1) {`
262			`addr = cpuGetPC();`
263			`count = 16;`
264			`} else if (n == 2) {`
265			`if (!getHexNumber(tokens[1], &addr)) {`
266			`cPrintf("illegal address\n");`
267			`return;`
268			`}`
269			`count = 16;`
270			`} else if (n == 3) {`
271			`if (!getHexNumber(tokens[1], &addr)) {`
272			`cPrintf("illegal address\n");`
273			`return;`
274			`}`
275			`if (!getHexNumber(tokens[2], &count)) {`
276			`cPrintf("illegal count\n");`
277			`return;`
278			`}`
279			`if (count == 0) {`
280			`return;`
281			`}`
282			`} else {`
283			`help();`
284			`return;`
285			`}`
286			`addr &= ~0x00000003;`
287			`psw = cpuGetPSW();`
288			`for (i = 0; i < count; i++) {`
289			`instr = mmuReadWord(addr, psw & PSW_UM);`
290			`cPrintf("%08X: %08X %s\n",`
291			`addr, instr, disasm(instr, addr));`
292			`if (addr + 4 < addr) {`
293			`/* wrap-around */`
294			`break;`
295			`}`
296			`addr += 4;`
297			`}`
298			`}`
299
300
301			`static void doBreak(char *tokens[], int n) {`
302			`Word addr;`
303
304			`if (n == 1) {`
305			`cpuResetBreak();`
306			`showBreakAndTotal();`
307			`} else if (n == 2) {`
308			`if (!getHexNumber(tokens[1], &addr)) {`
309			`cPrintf("illegal address\n");`
310			`return;`
311			`}`
312			`addr &= ~0x00000003;`
313			`cpuSetBreak(addr);`
314			`showBreakAndTotal();`
315			`} else {`
316			`help();`
317			`}`
318			`}`
319
320
321			`static void doContinue(char *tokens[], int n) {`
322			`Word count, i;`
323			`Word addr;`
324
325			`if (n == 1) {`
326			`count = 1;`
327			`} else if (n == 2) {`
328			`if (!getHexNumber(tokens[1], &count) \|\| count == 0) {`
329			`cPrintf("illegal count\n");`
330			`return;`
331			`}`
332			`} else {`
333			`help();`
334			`return;`
335			`}`
336			`cPrintf("CPU is running, press ^C to interrupt...\n");`
337			`for (i = 0; i < count; i++) {`
338			`cpuRun();`
339			`}`
340			`addr = cpuGetPC();`
341			`cPrintf("Break at %08X\n", addr);`
342			`showPC();`
343			`}`
344
345
346			`static void doStep(char *tokens[], int n) {`
347			`Word count, i;`
348
349			`if (n == 1) {`
350			`count = 1;`
351			`} else if (n == 2) {`
352			`if (!getHexNumber(tokens[1], &count) \|\| count == 0) {`
353			`cPrintf("illegal count\n");`
354			`return;`
355			`}`
356			`} else {`
357			`help();`
358			`return;`
359			`}`
360			`for (i = 0; i < count; i++) {`
361			`cpuStep();`
362			`}`
363			`showPC();`
364			`}`
365
366
367			`static void doPC(char *tokens[], int n) {`
368			`Word addr;`
369
370			`if (n == 1) {`
371			`showPC();`
372			`} else if (n == 2) {`
373			`if (!getHexNumber(tokens[1], &addr)) {`
374			`cPrintf("illegal address\n");`
375			`return;`
376			`}`
377			`addr &= ~0x00000003;`
378			`cpuSetPC(addr);`
379			`showPC();`
380			`} else {`
381			`help();`
382			`}`
383			`}`
384
385
386			`static void explainPSW(Word data) {`
387			`int i;`
388
389			`cPrintf("interrupt vector : %s (%s)\n",`
390			`data & PSW_V ? "on " : "off",`
391			`data & PSW_V ? "RAM" : "ROM");`
392			`cPrintf("current user mode : %s (%s)\n",`
393			`data & PSW_UM ? "on " : "off",`
394			`data & PSW_UM ? "user" : "kernel");`
395			`cPrintf("previous user mode : %s (%s)\n",`
396			`data & PSW_PUM ? "on " : "off",`
397			`data & PSW_PUM ? "user" : "kernel");`
398			`cPrintf("old user mode : %s (%s)\n",`
399			`data & PSW_OUM ? "on " : "off",`
400			`data & PSW_OUM ? "user" : "kernel");`
401			`cPrintf("current interrupt enable : %s (%s)\n",`
402			`data & PSW_IE ? "on " : "off",`
403			`data & PSW_IE ? "enabled" : "disabled");`
404			`cPrintf("previous interrupt enable : %s (%s)\n",`
405			`data & PSW_PIE ? "on " : "off",`
406			`data & PSW_PIE ? "enabled" : "disabled");`
407			`cPrintf("old interrupt enable : %s (%s)\n",`
408			`data & PSW_OIE ? "on " : "off",`
409			`data & PSW_OIE ? "enabled" : "disabled");`
410			`cPrintf("last interrupt acknowledged : %02X (%s)\n",`
411			`(data & PSW_PRIO_MASK) >> 16,`
412			`exceptionToString((data & PSW_PRIO_MASK) >> 16));`
413			`for (i = 15; i >= 0; i--) {`
414			`cPrintf("%-35s: %s (%s)\n",`
415			`exceptionToString(i),`
416			`data & (1 << i) ? "on " : "off",`
417			`data & (1 << i) ? "enabled" : "disabled");`
418			`}`
419			`}`
420
421
422			`static void doPSW(char *tokens[], int n) {`
423			`Word data;`
424
425			`if (n == 1) {`
426			`data = cpuGetPSW();`
427			`showPSW();`
428			`showIRQ();`
429			`explainPSW(data);`
430			`} else if (n == 2) {`
431			`if (!getHexNumber(tokens[1], &data)) {`
432			`cPrintf("illegal data\n");`
433			`return;`
434			`}`
435			`data &= 0x0FFFFFFF;`
436			`cpuSetPSW(data);`
437			`showPSW();`
438			`showIRQ();`
439			`explainPSW(data);`
440			`} else {`
441			`help();`
442			`}`
443			`}`
444
445
446			`static void doRegister(char *tokens[], int n) {`
447			`int i, j;`
448			`int reg;`
449			`Word data;`
450
451			`if (n == 1) {`
452			`for (i = 0; i < 8; i++) {`
453			`for (j = 0; j < 4; j++) {`
454			`reg = 8 * j + i;`
455			`data = cpuGetReg(reg);`
456			`cPrintf("$%-2d %08X ", reg, data);`
457			`}`
458			`cPrintf("\n");`
459			`}`
460			`showPSW();`
461			`showIRQ();`
462			`showBreakAndTotal();`
463			`showPC();`
464			`} else if (n == 2) {`
465			`if (!getDecNumber(tokens[1], &reg) \|\| reg < 0 \|\| reg >= 32) {`
466			`cPrintf("illegal register number\n");`
467			`return;`
468			`}`
469			`data = cpuGetReg(reg);`
470			`cPrintf("$%-2d %08X\n", reg, data);`
471			`} else if (n == 3) {`
472			`if (!getDecNumber(tokens[1], &reg) \|\| reg < 0 \|\| reg >= 32) {`
473			`cPrintf("illegal register number\n");`
474			`return;`
475			`}`
476			`if (!getHexNumber(tokens[2], &data)) {`
477			`cPrintf("illegal data\n");`
478			`return;`
479			`}`
480			`cpuSetReg(reg, data);`
481			`} else {`
482			`help();`
483			`}`
484			`}`
485
486
487			`static void doDump(char *tokens[], int n) {`
488			`Word addr, count;`
489			`Word psw;`
490			`Word lo, hi, curr;`
491			`int lines, i, j;`
492			`Word tmp;`
493			`Byte c;`
494
495			`if (n == 1) {`
496			`addr = cpuGetPC();`
497			`count = 16 * 16;`
498			`} else if (n == 2) {`
499			`if (!getHexNumber(tokens[1], &addr)) {`
500			`cPrintf("illegal address\n");`
501			`return;`
502			`}`
503			`count = 16 * 16;`
504			`} else if (n == 3) {`
505			`if (!getHexNumber(tokens[1], &addr)) {`
506			`cPrintf("illegal address\n");`
507			`return;`
508			`}`
509			`if (!getHexNumber(tokens[2], &count)) {`
510			`cPrintf("illegal count\n");`
511			`return;`
512			`}`
513			`if (count == 0) {`
514			`return;`
515			`}`
516			`} else {`
517			`help();`
518			`return;`
519			`}`
520			`psw = cpuGetPSW();`
521			`lo = addr & ~0x0000000F;`
522			`hi = addr + count - 1;`
523			`if (hi < lo) {`
524			`/* wrap-around */`
525			`hi = 0xFFFFFFFF;`
526			`}`
527			`lines = (hi - lo + 16) >> 4;`
528			`curr = lo;`
529			`for (i = 0; i < lines; i++) {`
530			`cPrintf("%08X: ", curr);`
531			`for (j = 0; j < 16; j++) {`
532			`tmp = curr + j;`
533			`if (tmp < addr \|\| tmp > hi) {`
534			`cPrintf(" ");`
535			`} else {`
536			`c = mmuReadByte(tmp, psw & PSW_UM);`
537			`cPrintf("%02X", c);`
538			`}`
539			`cPrintf(" ");`
540			`}`
541			`cPrintf(" ");`
542			`for (j = 0; j < 16; j++) {`
543			`tmp = curr + j;`
544			`if (tmp < addr \|\| tmp > hi) {`
545			`cPrintf(" ");`
546			`} else {`
547			`c = mmuReadByte(tmp, psw & PSW_UM);`
548			`if (c >= 32 && c <= 126) {`
549			`cPrintf("%c", c);`
550			`} else {`
551			`cPrintf(".");`
552			`}`
553			`}`
554			`}`
555			`cPrintf("\n");`
556			`curr += 16;`
557			`}`
558			`}`
559
560
561			`static void doMemoryWord(char *tokens[], int n) {`
562			`Word psw;`
563			`Word addr;`
564			`Word data;`
565			`Word tmpData;`
566
567			`psw = cpuGetPSW();`
568			`if (n == 1) {`
569			`addr = cpuGetPC();`
570			`data = mmuReadWord(addr, psw & PSW_UM);`
571			`cPrintf("%08X: %08X\n", addr, data);`
572			`} else if (n == 2) {`
573			`if (!getHexNumber(tokens[1], &addr)) {`
574			`cPrintf("illegal address\n");`
575			`return;`
576			`}`
577			`data = mmuReadWord(addr, psw & PSW_UM);`
578			`cPrintf("%08X: %08X\n", addr, data);`
579			`} else if (n == 3) {`
580			`if (!getHexNumber(tokens[1], &addr)) {`
581			`cPrintf("illegal address\n");`
582			`return;`
583			`}`
584			`if (!getHexNumber(tokens[2], &tmpData)) {`
585			`cPrintf("illegal data\n");`
586			`return;`
587			`}`
588			`data = tmpData;`
589			`mmuWriteWord(addr, data, psw & PSW_UM);`
590			`} else {`
591			`help();`
592			`}`
593			`}`
594
595
596			`static void doMemoryHalf(char *tokens[], int n) {`
597			`Word psw;`
598			`Word addr;`
599			`Half data;`
600			`Word tmpData;`
601
602			`psw = cpuGetPSW();`
603			`if (n == 1) {`
604			`addr = cpuGetPC();`
605			`data = mmuReadHalf(addr, psw & PSW_UM);`
606			`cPrintf("%08X: %04X\n", addr, data);`
607			`} else if (n == 2) {`
608			`if (!getHexNumber(tokens[1], &addr)) {`
609			`cPrintf("illegal address\n");`
610			`return;`
611			`}`
612			`data = mmuReadHalf(addr, psw & PSW_UM);`
613			`cPrintf("%08X: %04X\n", addr, data);`
614			`} else if (n == 3) {`
615			`if (!getHexNumber(tokens[1], &addr)) {`
616			`cPrintf("illegal address\n");`
617			`return;`
618			`}`
619			`if (!getHexNumber(tokens[2], &tmpData)) {`
620			`cPrintf("illegal data\n");`
621			`return;`
622			`}`
623			`data = (Half) tmpData;`
624			`mmuWriteHalf(addr, data, psw & PSW_UM);`
625			`} else {`
626			`help();`
627			`}`
628			`}`
629
630
631			`static void doMemoryByte(char *tokens[], int n) {`
632			`Word psw;`
633			`Word addr;`
634			`Byte data;`
635			`Word tmpData;`
636
637			`psw = cpuGetPSW();`
638			`if (n == 1) {`
639			`addr = cpuGetPC();`
640			`data = mmuReadByte(addr, psw & PSW_UM);`
641			`cPrintf("%08X: %02X\n", addr, data);`
642			`} else if (n == 2) {`
643			`if (!getHexNumber(tokens[1], &addr)) {`
644			`cPrintf("illegal address\n");`
645			`return;`
646			`}`
647			`data = mmuReadByte(addr, psw & PSW_UM);`
648			`cPrintf("%08X: %02X\n", addr, data);`
649			`} else if (n == 3) {`
650			`if (!getHexNumber(tokens[1], &addr)) {`
651			`cPrintf("illegal address\n");`
652			`return;`
653			`}`
654			`if (!getHexNumber(tokens[2], &tmpData)) {`
655			`cPrintf("illegal data\n");`
656			`return;`
657			`}`
658			`data = (Byte) tmpData;`
659			`mmuWriteByte(addr, data, psw & PSW_UM);`
660			`} else {`
661			`help();`
662			`}`
663			`}`
664
665
666			`static void doTLB(char *tokens[], int n) {`
667			`int index;`
668			`TLB_Entry tlbEntry;`
669			`Word data;`
670
671			`if (n == 1) {`
672			`for (index = 0; index < TLB_SIZE; index++) {`
673			`tlbEntry = mmuGetTLB(index);`
674			`cPrintf("TLB[%02d] page %08X frame %08X %c %c\n",`
675			`index, tlbEntry.page, tlbEntry.frame,`
676			`tlbEntry.write ? 'w' : '-',`
677			`tlbEntry.valid ? 'v' : '-');`
678			`}`
679			`cPrintf("Index(1) %08X\n", mmuGetIndex());`
680			`cPrintf("EntryHi(2) %08X\n", mmuGetEntryHi());`
681			`cPrintf("EntryLo(3) %08X\n", mmuGetEntryLo());`
682			`cPrintf("BadAddr(4) %08X\n", mmuGetBadAddr());`
683			`} else if (n == 2) {`
684			`if (!getDecNumber(tokens[1], &index) \|\| index < 0 \|\| index >= TLB_SIZE) {`
685			`cPrintf("illegal TLB index\n");`
686			`return;`
687			`}`
688			`tlbEntry = mmuGetTLB(index);`
689			`cPrintf("TLB[%02d] page %08X frame %08X %c %c\n",`
690			`index, tlbEntry.page, tlbEntry.frame,`
691			`tlbEntry.write ? 'w' : '-',`
692			`tlbEntry.valid ? 'v' : '-');`
693			`} else if (n == 3) {`
694			`help();`
695			`} else if (n == 4) {`
696			`if (!getDecNumber(tokens[1], &index) \|\| index < 0 \|\| index >= TLB_SIZE) {`
697			`cPrintf("illegal TLB index\n");`
698			`return;`
699			`}`
700			`if (!getHexNumber(tokens[3], &data)) {`
701			`cPrintf("illegal data\n");`
702			`return;`
703			`}`
704			`tlbEntry = mmuGetTLB(index);`
705			`if (strcmp(tokens[2], "p") == 0) {`
706			`tlbEntry.page = data & PAGE_MASK;`
707			`} else`
708			`if (strcmp(tokens[2], "f") == 0) {`
709			`tlbEntry.frame = data & PAGE_MASK;`
710			`tlbEntry.write = data & TLB_WRITE ? true : false;`
711			`tlbEntry.valid = data & TLB_VALID ? true : false;`
712			`} else {`
713			`cPrintf("TLB selector is not one of 'p' or 'f'\n");`
714			`return;`
715			`}`
716			`mmuSetTLB(index, tlbEntry);`
717			`cPrintf("TLB[%02d] page %08X frame %08X %c %c\n",`
718			`index, tlbEntry.page, tlbEntry.frame,`
719			`tlbEntry.write ? 'w' : '-',`
720			`tlbEntry.valid ? 'v' : '-');`
721			`} else {`
722			`help();`
723			`}`
724			`}`
725
726
727			`static void doInit(char *tokens[], int n) {`
728			`if (n == 1) {`
729			`timerReset();`
730			`displayReset();`
731			`keyboardReset();`
732			`termReset();`
733			`diskReset();`
734			`graphReset();`
735			`memoryReset();`
736			`mmuReset();`
737			`cpuReset();`
738			`} else {`
739			`help();`
740			`}`
741			`}`
742
743
744			`static void doQuit(char *tokens[], int n) {`
745			`if (n == 1) {`
746			`quit = true;`
747			`} else {`
748			`help();`
749			`}`
750			`}`
751
752
753			`typedef struct {`
754			`char *name;`
755			`void (cmdProc)(char tokens[], int n);`
756			`} Command;`
757
758
759			`static Command commands[] = {`
760			`{ "+", doArith },`
761			`{ "a", doAssemble },`
762			`{ "u", doUnassemble },`
763			`{ "b", doBreak },`
764			`{ "c", doContinue },`
765			`{ "s", doStep },`
766			`{ "@", doPC },`
767			`{ "p", doPSW },`
768			`{ "r", doRegister },`
769			`{ "d", doDump },`
770			`{ "mw", doMemoryWord },`
771			`{ "mh", doMemoryHalf },`
772			`{ "mb", doMemoryByte },`
773			`{ "t", doTLB },`
774			`{ "i", doInit },`
775			`{ "q", doQuit }`
776			`};`
777
778
779			`static Bool doCommand(char *line) {`
780			`char *tokens[MAX_TOKENS];`
781			`int n;`
782			`char *p;`
783			`int i;`
784
785			`n = 0;`
786			`p = strtok(line, " \t\n");`
787			`while (p != NULL) {`
788			`if (n == MAX_TOKENS) {`
789			`cPrintf("too many tokens on line\n");`
790			`return false;`
791			`}`
792			`tokens[n++] = p;`
793			`p = strtok(NULL, " \t\n");`
794			`}`
795			`if (n == 0) {`
796			`return false;`
797			`}`
798			`quit = false;`
799			`for (i = 0; i < sizeof(commands)/sizeof(commands[0]); i++) {`
800			`if (strcmp(commands[i].name, tokens[0]) == 0) {`
801			`(*commands[i].cmdProc)(tokens, n);`
802			`return quit;`
803			`}`
804			`}`
805			`help();`
806			`return false;`
807			`}`
808
809
810			`static char *article(char firstLetterOfNoun) {`
811			`switch (firstLetterOfNoun) {`
812			`case 'a':`
813			`case 'e':`
814			`case 'i':`
815			`case 'o':`
816			`case 'u':`
817			`return "An";`
818			`default:`
819			`return "A";`
820			`}`
821			`}`
822
823
824			`static void interactiveException(int exception) {`
825			`char *what;`
826
827			`what = exceptionToString(exception);`
828			`cPrintf("\n");`
829			`cPrintf("NOTE: %s %s occurred while executing the command.\n",`
830			`article(*what), what);`
831			`cPrintf(" This event will not alter the state of the CPU.\n");`
832			`}`
833
834
835			`Bool execCommand(char *line) {`
836			`jmp_buf myEnvironment;`
837			`int exception;`
838			`Bool quit;`
839
840			`exception = setjmp(myEnvironment);`
841			`if (exception == 0) {`
842			`/* initialization */`
843			`pushEnvironment(&myEnvironment);`
844			`quit = doCommand(line);`
845			`} else {`
846			`/* an exception was thrown */`
847			`interactiveException(exception);`
848			`quit = false;`
849			`}`
850			`popEnvironment();`
851			`return quit;`
852			`}`