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1.1 root 1: /*
2: *
3: * UNIX debugger
4: *
5: */
6:
7: #include "defs.h"
8: #include <signal.h>
9: #include "regs.h"
10: #include "space.h"
11:
12: static char BADEQ[] = "unexpected `='";
13:
14: BOOL executing;
15: extern char *lp;
16:
17: extern char lastc, peekc;
18: static char eqformat[ARB] = "z";
19: static char stformat[ARB] = "X\"= \"^i";
20:
21: ADDR ditto;
22:
23: ADDR dot;
24: WORD dotinc;
25: WORD adrval, cntval, loopcnt;
26: int adrflg, cntflg;
27: int adrsp, dotsp, ditsp;
28:
29: /* command decoding */
30:
31: command(buf,defcom)
32: register char *buf;
33: char defcom;
34: {
35: int modifier, regptr;
36: char savc;
37: char *savlp=lp;
38: char savlc = lastc;
39: char savpc = peekc;
40: static char lastcom = '=';
41:
42: if (defcom == 0)
43: defcom = lastcom;
44: if (buf) {
45: if (*buf==EOR)
46: return(FALSE);
47: clrinp();
48: lp=buf;
49: }
50: do {
51: if (adrflg=expr(0)) {
52: dot=ditto=expv;
53: dotsp=ditsp=expsp;
54: }
55: adrval=dot;
56: adrsp=dotsp;
57: if (rdc()==',' && expr(0)) {
58: cntflg=TRUE;
59: cntval=expv;
60: } else {
61: cntflg=FALSE;
62: cntval=1;
63: reread();
64: }
65: if (!eol(rdc()))
66: lastcom=lastc;
67: else {
68: if (adrflg==0)
69: dot=inkdot(dotinc);
70: reread();
71: lastcom=defcom;
72: }
73: switch(lastcom&STRIP) {
74: case '/':
75: case '=':
76: case '?':
77: acommand(lastcom & STRIP);
78: break;
79:
80: case '>':
81: lastcom=0;
82: savc=rdc();
83: if ((regptr=getreg(savc)) != BADREG)
84: rput(regptr, wtor(dot));
85: else if ((modifier=varchk(savc)) != -1)
86: var[modifier]=dot;
87: else
88: error("bad variable");
89: break;
90:
91: case '!':
92: lastcom=0;
93: shell();
94: break;
95:
96: case '$':
97: lastcom=0;
98: printtrace(nextchar());
99: break;
100:
101: case ':':
102: if (!executing) {
103: executing=TRUE;
104: subpcs(nextchar());
105: executing=FALSE;
106: lastcom=0;
107: }
108: break;
109:
110: case 0:
111: prints(DBNAME);
112: break;
113:
114: default:
115: error("bad command");
116: }
117: flushbuf();
118: } while (rdc()==';');
119: if (buf == NULL)
120: reread();
121: else {
122: clrinp();
123: lp=savlp;
124: lastc = savlc;
125: peekc = savpc;
126: }
127: return(adrflg && dot!=0);
128: }
129:
130: /*
131: * [/?][wml]
132: */
133:
134: acommand(pc)
135: char pc;
136: {
137: register int itype;
138: int eqcom;
139: int star;
140: ADDR savdot;
141:
142: switch (pc) {
143: case '/':
144: itype = CORF | DATASP;
145: break;
146:
147: case '=':
148: itype = NOSP;
149: break;
150:
151: case '?':
152: itype = SYMF | INSTSP;
153: break;
154: }
155: eqcom = FALSE;
156: star = FALSE;
157: if (pc == '=')
158: eqcom = TRUE;
159: else {
160: if (rdc()=='*')
161: star = TRUE;
162: else
163: reread();
164: if (star) {
165: if (itype & SYMF)
166: itype = SYMF | DATASP;
167: else
168: itype = CORF | INSTSP;
169: }
170: if ((adrsp & SPTYPE) == REGSP) {
171: itype &=~ SPTYPE;
172: itype |= REGSP;
173: }
174: }
175: switch (rdc()) {
176: case 'm':
177: if (eqcom)
178: error(BADEQ);
179: cmdmap(itype, star);
180: break;
181:
182: case 'L':
183: case 'l':
184: if (eqcom)
185: error(BADEQ);
186: cmdsrc(lastc, itype, itype);
187: break;
188:
189: case 'W':
190: case 'w':
191: if (eqcom)
192: error(BADEQ);
193: cmdwrite(lastc, itype);
194: break;
195:
196: default:
197: reread();
198: getformat(eqcom ? eqformat : stformat);
199: if (!eqcom)
200: psymoff((WORD)dot, itype, itype & SYMF ?"?%16t":"/%16t");
201: scanform(cntval,(eqcom?eqformat:stformat),itype,itype);
202: }
203: }
204:
205: cmdsrc(c, itype, ptype)
206: char c;
207: {
208: register WORD w;
209: register WORD locval, locmsk;
210: ADDR savdot;
211:
212: if (c == 'L')
213: dotinc = SZLONG;
214: else
215: dotinc = SZSHORT;
216: savdot=dot;
217: expr(1);
218: locval=expv;
219: if (expr(0))
220: locmsk=expv;
221: else
222: locmsk = ~0;
223: if (c == 'L') {
224: for (;;) {
225: w = ltow(lget(dot, itype));
226: if (errflg || mkfault
227: || (w & locmsk) == locval)
228: break;
229: dot = inkdot(dotinc);
230: }
231: }
232: else {
233: for (;;) {
234: w = stow(sget(dot, itype));
235: if (errflg || mkfault
236: || (w & locmsk) == locval)
237: break;
238: dot = inkdot(dotinc);
239: }
240: }
241: if (errflg) {
242: dot=savdot;
243: errflg="cannot locate value";
244: }
245: psymoff((WORD)dot,ptype,"");
246: }
247:
248: cmdwrite(wcom, itype)
249: char wcom;
250: int itype;
251: {
252: ADDR savdot;
253: char format[2];
254:
255: format[0] = wcom == 'w' ? 'r' : 'R';
256: format[1] = 0;
257: expr(1);
258: do {
259: savdot=dot;
260: psymoff((WORD)dot, itype, itype & SYMF ?"?%16t":"/%16t");
261: exform(1,format,itype,itype);
262: errflg=0;
263: dot=savdot;
264: if (wcom == 'W')
265: lput(dot,itype,wtol(expv));
266: else
267: sput(dot,itype,wtos(expv));
268: savdot=dot;
269: printf("=%8t");
270: exform(1,format,itype,itype);
271: newline();
272: } while (expr(0) && errflg==0);
273: dot=savdot;
274: chkerr();
275: }
276:
277: /*
278: * collect a register name; return register offset
279: * this is not what i'd call a good division of labour
280: */
281:
282: int
283: getreg(regnam)
284: {
285: char buf[LINSIZ];
286: register char *p;
287: register int c;
288:
289: p = buf;
290: *p++ = regnam;
291: while (isalnum(c = readchar()))
292: *p++ = c;
293: *p = 0;
294: reread();
295: return (rname(buf));
296: }
297:
298: /*
299: * shell escape
300: */
301:
302: extern (*sigint)(), (*sigqit)();
303:
304: shell()
305: {
306: int rc, status, unixpid;
307: char *sh;
308: char *argp = lp;
309: int (*isig)();
310: char *getenv();
311:
312: if ((sh = getenv("SHELL")) == NULL)
313: sh = "/bin/sh";
314: while (lastc!=EOR)
315: rdc();
316: if ((unixpid=fork())==0) {
317: signal(SIGINT, sigint);
318: signal(SIGQUIT, sigqit);
319: *lp=0;
320: execl(sh, "sh", "-c", argp, 0);
321: _exit(16);
322: } else if (unixpid == -1) {
323: error("cannot fork");
324: } else {
325: isig = signal(SIGINT, SIG_IGN);
326: while ((rc = wait(&status)) != unixpid && rc != -1)
327: ;
328: signal(SIGINT, isig);
329: prints("!");
330: reread();
331: }
332: }
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