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[/] [eco32/] [trunk/] [sim/] [command.c] - Blame information for rev 90

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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 "output.h"
#include "shutdown.h"
#include "graph.h"
 
 
#define MAX_TOKENS      10
 
 
static Bool quit;
 
 
typedef struct {
  char *name;
  void (*hlpProc)(void);
  void (*cmdProc)(char *tokens[], int n);
} Command;
 
extern Command commands[];
extern int numCommands;
 
 
static void help(void) {
  cPrintf("valid commands are:\n");
  cPrintf("  help    get help\n");
  cPrintf("  +       add and subtract\n");
  cPrintf("  a       assemble\n");
  cPrintf("  u       unassemble\n");
  cPrintf("  b       set/reset breakpoint\n");
  cPrintf("  c       continue from breakpoint\n");
  cPrintf("  s       single-step\n");
  cPrintf("  #       show/set PC\n");
  cPrintf("  p       show/set PSW\n");
  cPrintf("  r       show/set register\n");
  cPrintf("  d       dump memory\n");
  cPrintf("  mw      show/set memory word\n");
  cPrintf("  mh      show/set memory halfword\n");
  cPrintf("  mb      show/set memory byte\n");
  cPrintf("  t       show/set TLB contents\n");
  cPrintf("  i       initialize hardware\n");
  cPrintf("  q       quit simulator\n");
  cPrintf("type 'help <cmd>' to get help for <cmd>\n");
}
 
 
static void help00(void) {
  cPrintf("  help              show a list of commands\n");
  cPrintf("  help <cmd>        show help for <cmd>\n");
}
 
 
static void help01(void) {
  cPrintf("  +  <num1> <num2>  add and subtract <num1> and <num2>\n");
}
 
 
static void help02(void) {
  cPrintf("  a                 assemble starting at PC\n");
  cPrintf("  a  <addr>         assemble starting at <addr>\n");
}
 
 
static void help03(void) {
  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");
}
 
 
static void help04(void) {
  cPrintf("  b                 reset break\n");
  cPrintf("  b  <addr>         set break at <addr>\n");
}
 
 
static void help05(void) {
  cPrintf("  c                 continue execution\n");
  cPrintf("  c  <cnt>          continue execution <cnt> times\n");
}
 
 
static void help06(void) {
  cPrintf("  s                 single-step one instruction\n");
  cPrintf("  s  <cnt>          single-step <cnt> instructions\n");
}
 
 
static void help07(void) {
  cPrintf("  #                 show PC\n");
  cPrintf("  #  <addr>         set PC to <addr>\n");
}
 
 
static void help08(void) {
  cPrintf("  p                 show PSW\n");
  cPrintf("  p  <data>         set PSW to <data>\n");
}
 
 
static void help09(void) {
  cPrintf("  r                 show all registers\n");
  cPrintf("  r  <reg>          show register <reg>\n");
  cPrintf("  r  <reg> <data>   set register <reg> to <data>\n");
}
 
 
static void help10(void) {
  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");
}
 
 
static void help11(void) {
  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");
}
 
 
static void help12(void) {
  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");
}
 
 
static void help13(void) {
  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");
}
 
 
static void help14(void) {
  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");
}
 
 
static void help15(void) {
  cPrintf("  i                 initialize hardware\n");
}
 
 
static void help16(void) {
  cPrintf("  q                 quit simulator\n");
}
 
 
static char *cause[32] = {
  /*  0 */  "serial line 0 xmt interrupt",
  /*  1 */  "serial line 0 rcv interrupt",
  /*  2 */  "serial line 1 xmt interrupt",
  /*  3 */  "serial line 1 rcv 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 0 interrupt",
  /* 15 */  "timer 1 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 doHelp(char *tokens[], int n) {
  int i;
 
  if (n == 1) {
    help();
  } else if (n == 2) {
    for (i = 0; i < numCommands; i++) {
      if (strcmp(commands[i].name, tokens[1]) == 0) {
        (*commands[i].hlpProc)();
        return;
      }
    }
    cPrintf("no help available for '%s', sorry\n", tokens[1]);
  } else {
    help00();
  }
}
 
 
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 {
    help01();
  }
}
 
 
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 {
    help02();
    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 {
    help03();
    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 {
    help04();
  }
}
 
 
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 {
    help05();
    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 {
    help06();
    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 {
    help07();
  }
}
 
 
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 {
    help08();
  }
}
 
 
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 {
    help09();
  }
}
 
 
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 {
    help10();
    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 {
    help11();
  }
}
 
 
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 {
    help12();
  }
}
 
 
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 {
    help13();
  }
}
 
 
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) {
    help14();
  } 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 {
    help14();
  }
}
 
 
static void doInit(char *tokens[], int n) {
  if (n == 1) {
    timerReset();
    displayReset();
    keyboardReset();
    termReset();
    diskReset();
    outputReset();
    shutdownReset();
    graphReset();
    memoryReset();
    mmuReset();
    cpuReset();
  } else {
    help15();
  }
}
 
 
static void doQuit(char *tokens[], int n) {
  if (n == 1) {
    quit = true;
  } else {
    help16();
  }
}
 
 
Command commands[] = {
  { "help", help00, doHelp       },
  { "+",    help01, doArith      },
  { "a",    help02, doAssemble   },
  { "u",    help03, doUnassemble },
  { "b",    help04, doBreak      },
  { "c",    help05, doContinue   },
  { "s",    help06, doStep       },
  { "#",    help07, doPC         },
  { "p",    help08, doPSW        },
  { "r",    help09, doRegister   },
  { "d",    help10, doDump       },
  { "mw",   help11, doMemoryWord },
  { "mh",   help12, doMemoryHalf },
  { "mb",   help13, doMemoryByte },
  { "t",    help14, doTLB        },
  { "i",    help15, doInit       },
  { "q",    help16, doQuit       },
};
 
int numCommands = sizeof(commands) / sizeof(commands[0]);
 
 
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;
}

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	25	hellwig	`#include "output.h"`
26			`#include "shutdown.h"`
27	8	hellwig	`#include "graph.h"`
28
29
30			`#define MAX_TOKENS 10`
31
32
33			`static Bool quit;`
34
35
36	82	hellwig	`typedef struct {`
37			`char *name;`
38			`void (*hlpProc)(void);`
39			`void (cmdProc)(char tokens[], int n);`
40			`} Command;`
41
42			`extern Command commands[];`
43			`extern int numCommands;`
44
45
46	8	hellwig	`static void help(void) {`
47			`cPrintf("valid commands are:\n");`
48	82	hellwig	`cPrintf(" help get help\n");`
49			`cPrintf(" + add and subtract\n");`
50			`cPrintf(" a assemble\n");`
51			`cPrintf(" u unassemble\n");`
52			`cPrintf(" b set/reset breakpoint\n");`
53			`cPrintf(" c continue from breakpoint\n");`
54			`cPrintf(" s single-step\n");`
55			`cPrintf(" # show/set PC\n");`
56			`cPrintf(" p show/set PSW\n");`
57			`cPrintf(" r show/set register\n");`
58			`cPrintf(" d dump memory\n");`
59			`cPrintf(" mw show/set memory word\n");`
60			`cPrintf(" mh show/set memory halfword\n");`
61			`cPrintf(" mb show/set memory byte\n");`
62			`cPrintf(" t show/set TLB contents\n");`
63			`cPrintf(" i initialize hardware\n");`
64			`cPrintf(" q quit simulator\n");`
65			`cPrintf("type 'help <cmd>' to get help for <cmd>\n");`
66			`}`
67
68
69			`static void help00(void) {`
70			`cPrintf(" help show a list of commands\n");`
71			`cPrintf(" help <cmd> show help for <cmd>\n");`
72			`}`
73
74
75			`static void help01(void) {`
76	8	hellwig	`cPrintf(" + <num1> <num2> add and subtract <num1> and <num2>\n");`
77	82	hellwig	`}`
78
79
80			`static void help02(void) {`
81	8	hellwig	`cPrintf(" a assemble starting at PC\n");`
82			`cPrintf(" a <addr> assemble starting at <addr>\n");`
83	82	hellwig	`}`
84
85
86			`static void help03(void) {`
87	8	hellwig	`cPrintf(" u unassemble 16 instrs starting at PC\n");`
88			`cPrintf(" u <addr> unassemble 16 instrs starting at <addr>\n");`
89			`cPrintf(" u <addr> <cnt> unassemble <cnt> instrs starting at <addr>\n");`
90	82	hellwig	`}`
91
92
93			`static void help04(void) {`
94	8	hellwig	`cPrintf(" b reset break\n");`
95			`cPrintf(" b <addr> set break at <addr>\n");`
96	82	hellwig	`}`
97
98
99			`static void help05(void) {`
100	8	hellwig	`cPrintf(" c continue execution\n");`
101			`cPrintf(" c <cnt> continue execution <cnt> times\n");`
102	82	hellwig	`}`
103
104
105			`static void help06(void) {`
106	8	hellwig	`cPrintf(" s single-step one instruction\n");`
107			`cPrintf(" s <cnt> single-step <cnt> instructions\n");`
108	82	hellwig	`}`
109
110
111			`static void help07(void) {`
112			`cPrintf(" # show PC\n");`
113			`cPrintf(" # <addr> set PC to <addr>\n");`
114			`}`
115
116
117			`static void help08(void) {`
118	8	hellwig	`cPrintf(" p show PSW\n");`
119			`cPrintf(" p <data> set PSW to <data>\n");`
120	82	hellwig	`}`
121
122
123			`static void help09(void) {`
124	8	hellwig	`cPrintf(" r show all registers\n");`
125			`cPrintf(" r <reg> show register <reg>\n");`
126			`cPrintf(" r <reg> <data> set register <reg> to <data>\n");`
127	82	hellwig	`}`
128
129
130			`static void help10(void) {`
131	8	hellwig	`cPrintf(" d dump 256 bytes starting at PC\n");`
132			`cPrintf(" d <addr> dump 256 bytes starting at <addr>\n");`
133			`cPrintf(" d <addr> <cnt> dump <cnt> bytes starting at <addr>\n");`
134	82	hellwig	`}`
135
136
137			`static void help11(void) {`
138	8	hellwig	`cPrintf(" mw show memory word at PC\n");`
139			`cPrintf(" mw <addr> show memory word at <addr>\n");`
140			`cPrintf(" mw <addr> <data> set memory word at <addr> to <data>\n");`
141	82	hellwig	`}`
142
143
144			`static void help12(void) {`
145	8	hellwig	`cPrintf(" mh show memory halfword at PC\n");`
146			`cPrintf(" mh <addr> show memory halfword at <addr>\n");`
147			`cPrintf(" mh <addr> <data> set memory halfword at <addr> to <data>\n");`
148	82	hellwig	`}`
149
150
151			`static void help13(void) {`
152	8	hellwig	`cPrintf(" mb show memory byte at PC\n");`
153			`cPrintf(" mb <addr> show memory byte at <addr>\n");`
154			`cPrintf(" mb <addr> <data> set memory byte at <addr> to <data>\n");`
155	82	hellwig	`}`
156
157
158			`static void help14(void) {`
159	8	hellwig	`cPrintf(" t show TLB contents\n");`
160			`cPrintf(" t <i> show TLB contents at <i>\n");`
161			`cPrintf(" t <i> p <data> set TLB contents at <i> to page <data>\n");`
162			`cPrintf(" t <i> f <data> set TLB contents at <i> to frame <data>\n");`
163	82	hellwig	`}`
164
165
166			`static void help15(void) {`
167	8	hellwig	`cPrintf(" i initialize hardware\n");`
168	82	hellwig	`}`
169
170
171			`static void help16(void) {`
172	8	hellwig	`cPrintf(" q quit simulator\n");`
173			`}`
174
175
176			`static char *cause[32] = {`
177	72	hellwig	`/* 0 */ "serial line 0 xmt interrupt",`
178			`/* 1 */ "serial line 0 rcv interrupt",`
179			`/* 2 */ "serial line 1 xmt interrupt",`
180			`/* 3 */ "serial line 1 rcv interrupt",`
181	8	hellwig	`/* 4 */ "keyboard interrupt",`
182			`/* 5 */ "unknown interrupt",`
183			`/* 6 */ "unknown interrupt",`
184			`/* 7 */ "unknown interrupt",`
185			`/* 8 */ "disk interrupt",`
186			`/* 9 */ "unknown interrupt",`
187			`/* 10 */ "unknown interrupt",`
188			`/* 11 */ "unknown interrupt",`
189			`/* 12 */ "unknown interrupt",`
190			`/* 13 */ "unknown interrupt",`
191	71	hellwig	`/* 14 */ "timer 0 interrupt",`
192			`/* 15 */ "timer 1 interrupt",`
193	8	hellwig	`/* 16 */ "bus timeout exception",`
194			`/* 17 */ "illegal instruction exception",`
195			`/* 18 */ "privileged instruction exception",`
196			`/* 19 */ "divide instruction exception",`
197			`/* 20 */ "trap instruction exception",`
198			`/* 21 */ "TLB miss exception",`
199			`/* 22 */ "TLB write exception",`
200			`/* 23 */ "TLB invalid exception",`
201			`/* 24 */ "illegal address exception",`
202			`/* 25 */ "privileged address exception",`
203			`/* 26 */ "unknown exception",`
204			`/* 27 */ "unknown exception",`
205			`/* 28 */ "unknown exception",`
206			`/* 29 */ "unknown exception",`
207			`/* 30 */ "unknown exception",`
208			`/* 31 */ "unknown exception"`
209			`};`
210
211
212			`static char *exceptionToString(int exception) {`
213			`if (exception < 0 \|\|`
214			`exception >= sizeof(cause)/sizeof(cause[0])) {`
215			`error("exception number out of bounds");`
216			`}`
217			`return cause[exception];`
218			`}`
219
220
221			`static Bool getHexNumber(char str, Word valptr) {`
222			`char *end;`
223
224			`*valptr = strtoul(str, &end, 16);`
225			`return *end == '\0';`
226			`}`
227
228
229			`static Bool getDecNumber(char str, int valptr) {`
230			`char *end;`
231
232			`*valptr = strtoul(str, &end, 10);`
233			`return *end == '\0';`
234			`}`
235
236
237			`static void showPC(void) {`
238			`Word pc, psw;`
239			`Word instr;`
240
241			`pc = cpuGetPC();`
242			`psw = cpuGetPSW();`
243			`instr = mmuReadWord(pc, psw & PSW_UM);`
244			`cPrintf("PC %08X [PC] %08X %s\n",`
245			`pc, instr, disasm(instr, pc));`
246			`}`
247
248
249			`static void showBreakAndTotal(void) {`
250			`Word brk;`
251			`Word tot;`
252
253			`brk = cpuGetBreak();`
254			`tot = cpuGetTotal();`
255			`cPrintf("Brk ");`
256			`if (cpuTestBreak()) {`
257			`cPrintf("%08X", brk);`
258			`} else {`
259			`cPrintf("--------");`
260			`}`
261			`cPrintf(" Total %08X instructions\n", tot);`
262			`}`
263
264
265			`static void showIRQ(void) {`
266			`Word irq;`
267			`int i;`
268
269			`irq = cpuGetIRQ();`
270			`cPrintf("IRQ ");`
271			`for (i = 15; i >= 0; i--) {`
272			`cPrintf("%c", irq & (1 << i) ? '1' : '0');`
273			`}`
274			`cPrintf("\n");`
275			`}`
276
277
278			`static void showPSW(void) {`
279			`Word psw;`
280			`int i;`
281
282			`psw = cpuGetPSW();`
283			`cPrintf(" xxxx V UPO IPO IACK MASK\n");`
284			`cPrintf("PSW ");`
285			`for (i = 31; i >= 0; i--) {`
286			`if (i == 27 \|\| i == 26 \|\| i == 23 \|\| i == 20 \|\| i == 15) {`
287			`cPrintf(" ");`
288			`}`
289			`cPrintf("%c", psw & (1 << i) ? '1' : '0');`
290			`}`
291			`cPrintf("\n");`
292			`}`
293
294
295	82	hellwig	`static void doHelp(char *tokens[], int n) {`
296			`int i;`
297
298			`if (n == 1) {`
299			`help();`
300			`} else if (n == 2) {`
301			`for (i = 0; i < numCommands; i++) {`
302			`if (strcmp(commands[i].name, tokens[1]) == 0) {`
303			`(*commands[i].hlpProc)();`
304			`return;`
305			`}`
306			`}`
307			`cPrintf("no help available for '%s', sorry\n", tokens[1]);`
308			`} else {`
309			`help00();`
310			`}`
311			`}`
312
313
314	8	hellwig	`static void doArith(char *tokens[], int n) {`
315			`Word num1, num2, num3, num4;`
316
317			`if (n == 3) {`
318			`if (!getHexNumber(tokens[1], &num1)) {`
319			`cPrintf("illegal first number\n");`
320			`return;`
321			`}`
322			`if (!getHexNumber(tokens[2], &num2)) {`
323			`cPrintf("illegal second number\n");`
324			`return;`
325			`}`
326			`num3 = num1 + num2;`
327			`num4 = num1 - num2;`
328			`cPrintf("add = %08X, sub = %08X\n", num3, num4);`
329			`} else {`
330	83	hellwig	`help01();`
331	8	hellwig	`}`
332			`}`
333
334
335			`static void doAssemble(char *tokens[], int n) {`
336			`Word addr;`
337			`Word psw;`
338			`char prompt[30];`
339			`char *line;`
340			`char *msg;`
341			`Word instr;`
342
343			`if (n == 1) {`
344			`addr = cpuGetPC();`
345			`} else if (n == 2) {`
346			`if (!getHexNumber(tokens[1], &addr)) {`
347			`cPrintf("illegal address\n");`
348			`return;`
349			`}`
350			`} else {`
351	83	hellwig	`help02();`
352	8	hellwig	`return;`
353			`}`
354			`addr &= ~0x00000003;`
355			`psw = cpuGetPSW();`
356			`while (1) {`
357	82	hellwig	`sprintf(prompt, "ASM # %08X: ", addr);`
358	8	hellwig	`line = cGetLine(prompt);`
359			`if (line == '\0' \|\| line == '\n') {`
360			`break;`
361			`}`
362			`cAddHist(line);`
363			`msg = asmInstr(line, addr, &instr);`
364			`if (msg != NULL) {`
365			`cPrintf("%s\n", msg);`
366			`} else {`
367			`mmuWriteWord(addr, instr, psw & PSW_UM);`
368			`addr += 4;`
369			`}`
370			`}`
371			`}`
372
373
374			`static void doUnassemble(char *tokens[], int n) {`
375			`Word addr, count;`
376			`Word psw;`
377			`int i;`
378			`Word instr;`
379
380			`if (n == 1) {`
381			`addr = cpuGetPC();`
382			`count = 16;`
383			`} else if (n == 2) {`
384			`if (!getHexNumber(tokens[1], &addr)) {`
385			`cPrintf("illegal address\n");`
386			`return;`
387			`}`
388			`count = 16;`
389			`} else if (n == 3) {`
390			`if (!getHexNumber(tokens[1], &addr)) {`
391			`cPrintf("illegal address\n");`
392			`return;`
393			`}`
394			`if (!getHexNumber(tokens[2], &count)) {`
395			`cPrintf("illegal count\n");`
396			`return;`
397			`}`
398			`if (count == 0) {`
399			`return;`
400			`}`
401			`} else {`
402	83	hellwig	`help03();`
403	8	hellwig	`return;`
404			`}`
405			`addr &= ~0x00000003;`
406			`psw = cpuGetPSW();`
407			`for (i = 0; i < count; i++) {`
408			`instr = mmuReadWord(addr, psw & PSW_UM);`
409			`cPrintf("%08X: %08X %s\n",`
410			`addr, instr, disasm(instr, addr));`
411			`if (addr + 4 < addr) {`
412			`/* wrap-around */`
413			`break;`
414			`}`
415			`addr += 4;`
416			`}`
417			`}`
418
419
420			`static void doBreak(char *tokens[], int n) {`
421			`Word addr;`
422
423			`if (n == 1) {`
424			`cpuResetBreak();`
425			`showBreakAndTotal();`
426			`} else if (n == 2) {`
427			`if (!getHexNumber(tokens[1], &addr)) {`
428			`cPrintf("illegal address\n");`
429			`return;`
430			`}`
431			`addr &= ~0x00000003;`
432			`cpuSetBreak(addr);`
433			`showBreakAndTotal();`
434			`} else {`
435	83	hellwig	`help04();`
436	8	hellwig	`}`
437			`}`
438
439
440			`static void doContinue(char *tokens[], int n) {`
441			`Word count, i;`
442			`Word addr;`
443
444			`if (n == 1) {`
445			`count = 1;`
446			`} else if (n == 2) {`
447			`if (!getHexNumber(tokens[1], &count) \|\| count == 0) {`
448			`cPrintf("illegal count\n");`
449			`return;`
450			`}`
451			`} else {`
452	83	hellwig	`help05();`
453	8	hellwig	`return;`
454			`}`
455			`cPrintf("CPU is running, press ^C to interrupt...\n");`
456			`for (i = 0; i < count; i++) {`
457			`cpuRun();`
458			`}`
459			`addr = cpuGetPC();`
460			`cPrintf("Break at %08X\n", addr);`
461			`showPC();`
462			`}`
463
464
465			`static void doStep(char *tokens[], int n) {`
466			`Word count, i;`
467
468			`if (n == 1) {`
469			`count = 1;`
470			`} else if (n == 2) {`
471			`if (!getHexNumber(tokens[1], &count) \|\| count == 0) {`
472			`cPrintf("illegal count\n");`
473			`return;`
474			`}`
475			`} else {`
476	83	hellwig	`help06();`
477	8	hellwig	`return;`
478			`}`
479			`for (i = 0; i < count; i++) {`
480			`cpuStep();`
481			`}`
482			`showPC();`
483			`}`
484
485
486			`static void doPC(char *tokens[], int n) {`
487			`Word addr;`
488
489			`if (n == 1) {`
490			`showPC();`
491			`} else if (n == 2) {`
492			`if (!getHexNumber(tokens[1], &addr)) {`
493			`cPrintf("illegal address\n");`
494			`return;`
495			`}`
496			`addr &= ~0x00000003;`
497			`cpuSetPC(addr);`
498			`showPC();`
499			`} else {`
500	83	hellwig	`help07();`

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