Commit | Line | Data |
---|---|---|
534114c4 HK |
1 | # |
2 | /* | |
3 | * | |
4 | * UNIX debugger | |
5 | * | |
6 | */ | |
7 | ||
8 | #include "head.h" | |
9 | #include <a.out.h> | |
10 | struct user u; | |
11 | #include <stdio.h> | |
12 | ||
13 | ||
14 | MSG NOFORK; | |
15 | MSG ENDPCS; | |
16 | MSG BADWAIT; | |
17 | ||
18 | ADDR sigint; | |
19 | ADDR sigqit; | |
20 | ||
21 | /* breakpoints */ | |
22 | BKPTR bkpthead; | |
23 | ||
24 | ||
25 | REGLIST reglist [] = { | |
26 | "p1lr", P1LR, | |
27 | "p1br",P1BR, | |
28 | "p0lr", P0LR, | |
29 | "p0br",P0BR, | |
30 | "ksp",KSP, | |
31 | "esp",ESP, | |
32 | "ssp",SSP, | |
33 | "psl", PSL, | |
34 | "pc", PC, | |
35 | "usp",USP, | |
36 | "fp", FP, | |
37 | "ap", AP, | |
38 | "r11", R11, | |
39 | "r10", R10, | |
40 | "r9", R9, | |
41 | "r8", R8, | |
42 | "r7", R7, | |
43 | "r6", R6, | |
44 | "r5", R5, | |
45 | "r4", R4, | |
46 | "r3", R3, | |
47 | "r2", R2, | |
48 | "r1", R1, | |
49 | "r0", R0, | |
50 | }; | |
51 | ||
52 | ||
53 | CHAR lastc; | |
54 | ||
55 | INT fcor; | |
56 | INT fsym; | |
57 | STRING errflg; | |
58 | int errno; | |
59 | INT signo; | |
60 | ||
61 | L_INT dot; | |
62 | STRING symfil; | |
63 | INT wtflag; | |
64 | INT pid; | |
65 | INT adrflg; | |
66 | L_INT loopcnt; | |
67 | ||
68 | ||
69 | ||
70 | ||
71 | ||
72 | ||
73 | getsig(sig) | |
74 | { return(sig); | |
75 | } | |
76 | ||
77 | ADDR userpc = 1; | |
78 | ||
79 | runpcs(runmode,execsig) | |
80 | { | |
81 | REG BKPTR bkpt; | |
82 | IF adrflg THEN userpc=dot; FI | |
83 | WHILE --loopcnt>=0 | |
84 | DO | |
85 | if (debug) printf("\ncontinue %x %d\n",userpc,execsig); | |
86 | IF runmode==SINGLE | |
87 | THEN delbp(); /* hardware handles single-stepping */ | |
88 | ELSE /* continuing from a breakpoint is hard */ | |
89 | IF bkpt=scanbkpt(userpc) | |
90 | THEN execbkpt(bkpt,execsig); execsig=0; | |
91 | FI | |
92 | setbp(); | |
93 | FI | |
94 | ptrace(runmode,pid,userpc,execsig); | |
95 | bpwait(); chkerr(); execsig=0; delbp(); readregs(); | |
96 | ||
97 | loop1: IF (signo==0) ANDF (bkpt=scanbkpt(userpc)) | |
98 | THEN /* stopped by BPT instruction */ | |
99 | if (debug) printf("\n BPT code; '%s'%o'%o'%d", | |
100 | bkpt->comm,bkpt->comm[0],EOR,bkpt->flag); | |
101 | dot=bkpt->loc; | |
102 | IF bkpt->comm[0] != EOR | |
103 | THEN acommand(bkpt->comm); | |
104 | FI | |
105 | IF bkpt->flag==BKPTEXEC | |
106 | ORF ((bkpt->flag=BKPTEXEC) | |
107 | ANDF bkpt->comm[0]!=EOR) | |
108 | THEN execbkpt(bkpt,execsig); execsig=0; loopcnt++; | |
109 | goto loop1; | |
110 | ELSE bkpt->count=bkpt->initcnt; | |
111 | FI | |
112 | ELSE execsig=signo; | |
113 | if (execsig) break; | |
114 | FI | |
115 | OD | |
116 | if (debug) printf("Returning from runpcs\n"); | |
117 | } | |
118 | ||
119 | #define BPOUT 0 | |
120 | #define BPIN 1 | |
121 | INT bpstate = BPOUT; | |
122 | ||
123 | endpcs() | |
124 | { | |
125 | REG BKPTR bkptr; | |
126 | if (debug) printf("Entering endpcs with pid=%d\n"); | |
127 | IF pid | |
128 | THEN ptrace(EXIT,pid,0,0); pid=0; userpc=1; | |
129 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
130 | DO IF bkptr->flag | |
131 | THEN bkptr->flag=BKPTSET; | |
132 | FI | |
133 | OD | |
134 | FI | |
135 | bpstate=BPOUT; | |
136 | } | |
137 | ||
138 | #ifdef VFORK | |
139 | nullsig() | |
140 | { | |
141 | ||
142 | } | |
143 | #endif | |
144 | ||
145 | setup() | |
146 | { | |
147 | close(fsym); fsym = -1; | |
148 | #ifdef VFORK | |
149 | IF (pid = vfork()) == 0 | |
150 | #else | |
151 | IF (pid = fork()) == 0 | |
152 | #endif | |
153 | THEN ptrace(SETTRC,0,0,0); | |
154 | signal(SIGINT,sigint); signal(SIGQUIT,sigqit); | |
155 | #ifdef VFORK | |
156 | signal(SIGTRC,nullsig); | |
157 | #endif | |
158 | if (debug) printf("About to doexec pid=%d\n",pid); | |
159 | #ifdef UCBVAX | |
160 | doexec(); _exit(0); | |
161 | #else | |
162 | doexec(); exit(0); | |
163 | #endif | |
164 | ELIF pid == -1 | |
165 | THEN error(NOFORK); | |
166 | ELSE bpwait(); readregs(); | |
167 | if (debug) printf("About to open symfil = %s\n", symfil); | |
168 | fsym=open(symfil,wtflag); | |
169 | IF errflg | |
170 | THEN printf("%s: cannot execute\n",symfil); | |
171 | if (debug) printf("%d %s\n", errflg, errflg); | |
172 | endpcs(); | |
173 | FI | |
174 | FI | |
175 | bpstate=BPOUT; | |
176 | } | |
177 | ||
178 | execbkpt(bkptr,execsig) | |
179 | BKPTR bkptr; | |
180 | { | |
181 | if (debug) printf("exbkpt: %d\n",bkptr->count); | |
182 | delbp(); | |
183 | ptrace(SINGLE,pid,bkptr->loc,execsig); | |
184 | bkptr->flag=BKPTSET; | |
185 | bpwait(); chkerr(); readregs(); | |
186 | } | |
187 | ||
188 | extern STRING environ; | |
189 | ||
190 | doexec() | |
191 | { | |
192 | char *argl[MAXARG], args[LINSIZ]; | |
193 | register char c, redchar, *argsp, **arglp, *filnam; | |
194 | ||
195 | arglp = argl; | |
196 | argsp = args; | |
197 | *arglp++ = symfil; | |
198 | c = ' '; | |
199 | ||
200 | do { | |
201 | while (eqany(c, " \t")) { | |
202 | c = rdc(); | |
203 | } | |
204 | if (eqany(c, "<>")) { | |
205 | redchar = c; | |
206 | do { | |
207 | c = rdc(); | |
208 | } while (eqany(c, " \t")); | |
209 | filnam = argsp; | |
210 | do { | |
211 | *argsp++ = c; | |
212 | c = rdc(); | |
213 | } while (!eqany(c, " <>\t\n")); | |
214 | *argsp++ = '\0'; | |
215 | if (redchar == '<') { | |
216 | close(0); | |
217 | if (open(filnam,0) < 0) { | |
218 | printf("%s: cannot open\n",filnam); | |
219 | #ifdef UCBVAX | |
220 | _exit(0); | |
221 | #else | |
222 | exit(0); | |
223 | #endif | |
224 | } | |
225 | } else { | |
226 | close(1); | |
227 | if (creat(filnam,0666) < 0) { | |
228 | printf("%s: cannot create\n",filnam); | |
229 | #ifdef UCBVAX | |
230 | _exit(0); | |
231 | #else | |
232 | exit(0); | |
233 | #endif | |
234 | } | |
235 | } | |
236 | } else if (c != '\n') { | |
237 | *arglp++ = argsp; | |
238 | do { | |
239 | *argsp++ = c; | |
240 | c = rdc(); | |
241 | } while(!eqany(c, " <>\t\n")); | |
242 | *argsp++ = '\0'; | |
243 | } | |
244 | } while (c != '\n'); | |
245 | *arglp = (char *) 0; | |
246 | if (debug) { | |
247 | char **dap; | |
248 | printf("About to exect(%s, %d, %d)\n",symfil,argl,environ); | |
249 | for (dap = argl; *dap; dap++) { | |
250 | printf("%s, ", *dap); | |
251 | } | |
252 | } | |
253 | exect(symfil, argl, environ); | |
254 | perror("Returned from exect"); | |
255 | } | |
256 | ||
257 | BKPTR scanbkpt(adr) | |
258 | ADDR adr; | |
259 | { | |
260 | REG BKPTR bkptr; | |
261 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
262 | DO IF bkptr->flag ANDF bkptr->loc==adr | |
263 | THEN break; | |
264 | FI | |
265 | OD | |
266 | return(bkptr); | |
267 | } | |
268 | ||
269 | delbp() | |
270 | { | |
271 | REG ADDR a; | |
272 | REG BKPTR bkptr; | |
273 | IF bpstate!=BPOUT | |
274 | THEN | |
275 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
276 | DO IF bkptr->flag | |
277 | THEN a=bkptr->loc; | |
278 | ptrace(WIUSER,pid,a, | |
279 | (bkptr->ins&0xFF)|(ptrace(RIUSER,pid,a,0)&~0xFF)); | |
280 | FI | |
281 | OD | |
282 | bpstate=BPOUT; | |
283 | FI | |
284 | } | |
285 | ||
286 | setbp() | |
287 | { | |
288 | REG ADDR a; | |
289 | REG BKPTR bkptr; | |
290 | ||
291 | IF bpstate!=BPIN | |
292 | THEN | |
293 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
294 | DO IF bkptr->flag | |
295 | THEN a = bkptr->loc; | |
296 | bkptr->ins = ptrace(RIUSER, pid, a, 0); | |
297 | ptrace(WIUSER, pid, a, BPT | (bkptr->ins&~0xFF)); | |
298 | IF errno | |
299 | THEN error("cannot set breakpoint: "); | |
300 | printf("%s:%d @ %d\n", adrtoprocp(dot)->pname, | |
301 | adrtolineno(dot), dot); | |
302 | FI | |
303 | FI | |
304 | OD | |
305 | bpstate=BPIN; | |
306 | FI | |
307 | } | |
308 | ||
309 | bpwait() | |
310 | { | |
311 | REG ADDR w; | |
312 | ADDR stat; | |
313 | ||
314 | signal(SIGINT, 1); | |
315 | if (debug) printf("Waiting for pid %d\n",pid); | |
316 | WHILE (w = wait(&stat))!=pid ANDF w != -1 DONE | |
317 | if (debug) printf("Ending wait\n"); | |
318 | if (debug) printf("w = %d; pid = %d; stat = %o;\n", w,pid,stat); | |
319 | signal(SIGINT,sigint); | |
320 | IF w == -1 | |
321 | THEN pid=0; | |
322 | errflg=BADWAIT; | |
323 | ELIF (stat & 0177) != 0177 | |
324 | THEN IF signo = stat&0177 | |
325 | THEN sigprint(); | |
326 | FI | |
327 | IF stat&0200 | |
328 | THEN error(" - core dumped"); | |
329 | close(fcor); | |
330 | setcor(); | |
331 | FI | |
332 | pid=0; | |
333 | errflg=ENDPCS; | |
334 | ELSE signo = stat>>8; | |
335 | if (debug) printf("PC = %d, dbsubn = %d\n", | |
336 | ptrace(RUREGS, pid, PC, 0), extaddr("_dbsubn")); | |
337 | IF signo!=SIGTRC ANDF | |
338 | ptrace(RUREGS, pid, PC, 0) != extaddr("_dbsubn") | |
339 | THEN sigprint(); | |
340 | ELSE signo=0; | |
341 | FI | |
342 | FI | |
343 | } | |
344 | ||
345 | readregs() | |
346 | { | |
347 | /*get REG values from pcs*/ | |
348 | REG i; | |
349 | FOR i=24; --i>=0; | |
350 | DO *(ADDR *)(((ADDR)&u)+reglist[i].roffs) = | |
351 | ptrace(RUREGS, pid, reglist[i].roffs, 0); | |
352 | OD | |
353 | userpc= *(ADDR *)(((ADDR)&u)+PC); | |
354 | } | |
355 | ||
356 | char | |
357 | readchar() { | |
358 | lastc = *argsp++; | |
359 | if (lastc == '\0') lastc = '\n'; | |
360 | return(lastc); | |
361 | } | |
362 | ||
363 | char | |
364 | rdc() | |
365 | { | |
366 | register char c; | |
367 | ||
368 | c = *argsp++; | |
369 | return(c == '\0' ? '\n' : c); | |
370 | } |