Commit | Line | Data |
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ffee785a BJ |
1 | static char sccsid[] = "@(#)runpcs.c 4.1 %G%"; |
2 | # | |
3 | /* | |
4 | * | |
5 | * UNIX debugger | |
6 | * | |
7 | */ | |
8 | ||
9 | #include "head.h" | |
10 | #include <a.out.h> | |
11 | #include <stab.h> | |
12 | struct user u; | |
13 | #include <stdio.h> | |
14 | ||
15 | #ifndef SIGTRAP | |
16 | #define SIGTRAP SIGTRC | |
17 | #endif | |
18 | ||
19 | MSG NOFORK; | |
20 | MSG ENDPCS; | |
21 | MSG BADWAIT; | |
22 | ||
23 | ADDR sigint; | |
24 | ADDR sigqit; | |
25 | ADDR userpc; | |
26 | ||
27 | /* breakpoints */ | |
28 | BKPTR bkpthead; | |
29 | ||
30 | CHAR lastc; | |
31 | ||
32 | INT fcor; | |
33 | INT fsym; | |
34 | STRING errflg; | |
35 | int errno; | |
36 | INT signo; | |
37 | ||
38 | L_INT dot; | |
39 | STRING symfil; | |
40 | INT wtflag; | |
41 | INT pid; | |
42 | INT adrflg; | |
43 | L_INT loopcnt; | |
44 | ||
45 | ||
46 | ||
47 | ||
48 | ||
49 | ||
50 | getsig(sig) | |
51 | { return(sig); | |
52 | } | |
53 | ||
54 | runpcs(runmode,execsig) | |
55 | { | |
56 | REG BKPTR bkpt; | |
57 | IF adrflg THEN userpc=dot; FI | |
58 | WHILE --loopcnt>=0 | |
59 | DO | |
60 | if (debug) printf("\ncontinue %x %d\n",userpc,execsig); | |
61 | IF runmode==SINGLE | |
62 | THEN delbp(); /* hardware handles single-stepping */ | |
63 | ELSE /* continuing from a breakpoint is hard */ | |
64 | IF bkpt=scanbkpt(userpc) | |
65 | THEN execbkpt(bkpt,execsig); execsig=0; | |
66 | FI | |
67 | setbp(); | |
68 | FI | |
69 | ptrace(runmode,pid,userpc,execsig); | |
70 | bpwait(); chkerr(); execsig=0; delbp(); readregs(); | |
71 | ||
72 | loop1: IF (signo==0) ANDF (bkpt=scanbkpt(userpc)) | |
73 | THEN /* stopped by BPT instruction */ | |
74 | if (debug) printf("\n BPT code; '%s'%o'%o'%d", | |
75 | bkpt->comm,bkpt->comm[0],EOR,bkpt->flag); | |
76 | dot=bkpt->loc; | |
77 | IF bkpt->comm[0] != EOR | |
78 | THEN acommand(bkpt->comm); | |
79 | FI | |
80 | IF bkpt->flag==BKPTEXEC | |
81 | ORF ((bkpt->flag=BKPTEXEC) | |
82 | ANDF bkpt->comm[0]!=EOR) | |
83 | THEN execbkpt(bkpt,execsig); execsig=0; loopcnt++; | |
84 | goto loop1; | |
85 | ELSE bkpt->flag=BKPTSET; bkpt->count=bkpt->initcnt; | |
86 | FI | |
87 | ELSE execsig=signo; | |
88 | if (execsig) break; | |
89 | FI | |
90 | OD | |
91 | if (debug) printf("Returning from runpcs\n"); | |
92 | } | |
93 | ||
94 | #define BPOUT 0 | |
95 | #define BPIN 1 | |
96 | INT bpstate; | |
97 | ||
98 | endpcs() | |
99 | { | |
100 | REG BKPTR bkptr; | |
101 | if (debug) printf("Entering endpcs with pid=%d\n"); | |
102 | IF pid | |
103 | THEN ptrace(EXIT,pid,0,0); pid=0; userpc=1; | |
104 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
105 | DO IF bkptr->flag | |
106 | THEN bkptr->flag=BKPTSET; | |
107 | FI | |
108 | OD | |
109 | FI | |
110 | bpstate=BPOUT; | |
111 | } | |
112 | ||
113 | #ifdef VFORK | |
114 | nullsig() | |
115 | { | |
116 | ||
117 | } | |
118 | #endif | |
119 | ||
120 | setup() | |
121 | { | |
122 | close(fsym); fsym = -1; | |
123 | #ifdef VFORK | |
124 | IF (pid = vfork()) == 0 | |
125 | #else | |
126 | IF (pid = fork()) == 0 | |
127 | #endif | |
128 | THEN ptrace(SETTRC,0,0,0); | |
129 | signal(SIGINT,sigint); signal(SIGQUIT,sigqit); | |
130 | #ifdef VFORK | |
131 | signal(SIGTRAP,nullsig); | |
132 | #endif | |
133 | if (debug) printf("About to doexec pid=%d\n",pid); | |
134 | doexec(); _exit(0); | |
135 | ELIF pid == -1 | |
136 | THEN error(NOFORK); | |
137 | ELSE bpwait(); readregs(); | |
138 | if (debug) printf("About to open symfil = %s\n", symfil); | |
139 | fsym=open(symfil,wtflag); | |
140 | IF errflg | |
141 | THEN printf("%s: cannot execute\n",symfil); | |
142 | if (debug) printf("%d %s\n", errflg, errflg); | |
143 | endpcs(); | |
144 | FI | |
145 | FI | |
146 | bpstate=BPOUT; | |
147 | } | |
148 | ||
149 | execbkpt(bkptr,execsig) | |
150 | BKPTR bkptr; | |
151 | { | |
152 | if (debug) printf("exbkpt: %d\n",bkptr->count); | |
153 | delbp(); | |
154 | ptrace(SINGLE,pid,bkptr->loc,execsig); | |
155 | bkptr->flag=BKPTSET; | |
156 | bpwait(); chkerr(); readregs(); | |
157 | } | |
158 | ||
159 | extern STRING environ; | |
160 | ||
161 | doexec() | |
162 | { | |
163 | char *argl[MAXARG], args[LINSIZ]; | |
164 | register char c, redchar, *argsp, **arglp, *filnam; | |
165 | ||
166 | arglp = argl; | |
167 | argsp = args; | |
168 | *arglp++ = symfil; | |
169 | c = ' '; | |
170 | ||
171 | do { | |
172 | while (eqany(c, " \t")) { | |
173 | c = rdc(); | |
174 | } | |
175 | if (eqany(c, "<>")) { | |
176 | redchar = c; | |
177 | do { | |
178 | c = rdc(); | |
179 | } while (eqany(c, " \t")); | |
180 | filnam = argsp; | |
181 | do { | |
182 | *argsp++ = c; | |
183 | c = rdc(); | |
184 | } while (!eqany(c, " <>\t\n")); | |
185 | *argsp++ = '\0'; | |
186 | if (redchar == '<') { | |
187 | close(0); | |
188 | if (open(filnam,0) < 0) { | |
189 | printf("%s: cannot open\n",filnam); | |
190 | fflush(stdout); | |
191 | _exit(0); | |
192 | } | |
193 | } else { | |
194 | close(1); | |
195 | if (creat(filnam,0666) < 0) { | |
196 | printf("%s: cannot create\n",filnam); | |
197 | fflush(stdout); | |
198 | _exit(0); | |
199 | } | |
200 | } | |
201 | } else if (c != '\n') { | |
202 | *arglp++ = argsp; | |
203 | do { | |
204 | *argsp++ = c; | |
205 | c = rdc(); | |
206 | } while(!eqany(c, " <>\t\n")); | |
207 | *argsp++ = '\0'; | |
208 | } | |
209 | } while (c != '\n'); | |
210 | *arglp = (char *) 0; | |
211 | if (debug) { | |
212 | char **dap; | |
213 | printf("About to exect(%s, %d, %d)\n",symfil,argl,environ); | |
214 | for (dap = argl; *dap; dap++) { | |
215 | printf("%s, ", *dap); | |
216 | } | |
217 | } | |
218 | exect(symfil, argl, environ); | |
219 | perror("Returned from exect"); | |
220 | } | |
221 | ||
222 | BKPTR scanbkpt(adr) | |
223 | ADDR adr; | |
224 | { | |
225 | REG BKPTR bkptr; | |
226 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
227 | DO IF bkptr->flag ANDF bkptr->loc==adr | |
228 | THEN break; | |
229 | FI | |
230 | OD | |
231 | return(bkptr); | |
232 | } | |
233 | ||
234 | delbp() | |
235 | { | |
236 | REG ADDR a; | |
237 | REG BKPTR bkptr; | |
238 | IF bpstate!=BPOUT | |
239 | THEN | |
240 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
241 | DO IF bkptr->flag | |
242 | THEN a=bkptr->loc; | |
243 | ptrace(WIUSER,pid,a, | |
244 | (bkptr->ins&0xFF)|(ptrace(RIUSER,pid,a,0)&~0xFF)); | |
245 | FI | |
246 | OD | |
247 | bpstate=BPOUT; | |
248 | FI | |
249 | } | |
250 | ||
251 | setbp() | |
252 | { | |
253 | REG ADDR a; | |
254 | REG BKPTR bkptr; | |
255 | ||
256 | IF bpstate!=BPIN | |
257 | THEN | |
258 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
259 | DO IF bkptr->flag | |
260 | THEN a = bkptr->loc; | |
261 | bkptr->ins = ptrace(RIUSER, pid, a, 0); | |
262 | ptrace(WIUSER, pid, a, BPT | (bkptr->ins&~0xFF)); | |
263 | IF errno | |
264 | THEN error("cannot set breakpoint: "); | |
265 | printf("%s:%d @ %d\n", adrtoprocp(dot)->pname, | |
266 | adrtolineno(dot), dot); | |
267 | FI | |
268 | FI | |
269 | OD | |
270 | bpstate=BPIN; | |
271 | FI | |
272 | } | |
273 | ||
274 | bpwait() | |
275 | { | |
276 | REG ADDR w; | |
277 | ADDR stat; | |
278 | ||
279 | signal(SIGINT, 1); | |
280 | if (debug) printf("Waiting for pid %d\n",pid); | |
281 | WHILE (w = wait(&stat))!=pid ANDF w != -1 DONE | |
282 | if (debug) printf("Ending wait\n"); | |
283 | if (debug) printf("w = %d; pid = %d; stat = %o;\n", w,pid,stat); | |
284 | signal(SIGINT,sigint); | |
285 | IF w == -1 | |
286 | THEN pid=0; | |
287 | errflg=BADWAIT; | |
288 | ELIF (stat & 0177) != 0177 | |
289 | THEN IF signo = stat&0177 | |
290 | THEN sigprint(); | |
291 | FI | |
292 | IF stat&0200 | |
293 | THEN error(" - core dumped"); | |
294 | close(fcor); | |
295 | setcor(); | |
296 | FI | |
297 | pid=0; | |
298 | errflg=ENDPCS; | |
299 | ELSE signo = stat>>8; | |
300 | if (debug) printf("PC = %d, dbsubn = %d\n", | |
301 | ptrace(RUREGS, pid, PC, 0), extaddr("_dbsubn")); | |
302 | IF signo!=SIGTRAP ANDF | |
303 | ptrace(RUREGS, pid, PC, 0) != extaddr("_dbsubn") | |
304 | THEN sigprint(); | |
305 | ELSE signo=0; | |
306 | FI | |
307 | FI | |
308 | } | |
309 | ||
310 | REGLIST reglist[]; | |
311 | readregs() | |
312 | { | |
313 | /*get REG values from pcs*/ | |
314 | REG i; | |
315 | FOR i=24; --i>=0; | |
316 | DO *(ADDR *)(((ADDR)&u)+reglist[i].roffs) = | |
317 | ptrace(RUREGS, pid, reglist[i].roffs, 0); | |
318 | OD | |
319 | userpc= *(ADDR *)(((ADDR)&u)+PC); | |
320 | } | |
321 | ||
322 | char | |
323 | readchar() { | |
324 | lastc = *argsp++; | |
325 | if (lastc == '\0') lastc = '\n'; | |
326 | return(lastc); | |
327 | } | |
328 | ||
329 | char | |
330 | rdc() | |
331 | { | |
332 | register char c; | |
333 | ||
334 | c = *argsp++; | |
335 | return(c == '\0' ? '\n' : c); | |
336 | } |