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286e78ae SL |
1 | #ifndef lint |
2 | static char sccsid[] = "@(#)runpcs.c 1.1 (Berkeley) %G%"; | |
3 | #endif | |
4 | /* | |
5 | * | |
6 | * UNIX debugger | |
7 | * | |
8 | */ | |
9 | ||
10 | #include "defs.h" | |
11 | ||
12 | extern MAP txtmap; | |
13 | ||
14 | MSG NOFORK; | |
15 | MSG ENDPCS; | |
16 | MSG BADWAIT; | |
17 | ||
18 | CHAR *lp; | |
19 | SIG sigint; | |
20 | SIG sigqit; | |
21 | ||
22 | /* breakpoints */ | |
23 | BKPTR bkpthead; | |
24 | ||
25 | REGLIST reglist[]; | |
26 | ||
27 | CHAR lastc; | |
28 | ||
29 | INT fcor; | |
30 | INT fsym; | |
31 | STRING errflg; | |
32 | INT errno; | |
33 | INT signo; | |
34 | INT sigcode; | |
35 | ||
36 | L_INT dot; | |
37 | STRING symfil; | |
38 | INT wtflag; | |
39 | L_INT pid; | |
40 | L_INT expv; | |
41 | INT adrflg; | |
42 | L_INT loopcnt; | |
43 | ||
44 | ||
45 | ||
46 | ||
47 | ||
48 | /* service routines for sub process control */ | |
49 | ||
50 | getsig(sig) | |
51 | { return(expr(0) ? expv : sig); | |
52 | } | |
53 | ||
54 | ADDR userpc = 1; | |
55 | ||
56 | runpcs(runmode,execsig) | |
57 | { | |
58 | REG rc; | |
59 | REG BKPTR bkpt; | |
60 | IF adrflg THEN userpc=dot; FI | |
61 | printf("%s: running\n", symfil); | |
62 | ||
63 | WHILE --loopcnt>=0 | |
64 | DO | |
65 | #ifdef DEBUG | |
66 | printf("\ncontinue %X %D loopcnt=%D\n",userpc,execsig, loopcnt); | |
67 | #endif | |
68 | IF runmode==SINGLE | |
69 | THEN delbp(); /* hardware handles single-stepping */ | |
70 | ELSE /* continuing from a breakpoint is hard */ | |
71 | IF bkpt=scanbkpt(userpc) | |
72 | THEN execbkpt(bkpt,execsig); execsig=0; | |
73 | FI | |
74 | setbp(); | |
75 | FI | |
76 | ptrace(runmode,pid,userpc,execsig); | |
77 | bpwait(); chkerr(); execsig=0; delbp(); readregs(); | |
78 | ||
79 | IF (signo==0) ANDF (bkpt=scanbkpt(userpc)) | |
80 | THEN /* stopped by BPT instruction */ | |
81 | #ifdef DEBUG | |
82 | printf("\n BPT code; '%s'%o'%d", | |
83 | bkpt->comm,bkpt->comm[0],EOR,bkpt->flag); | |
84 | #endif | |
85 | dot=bkpt->loc; | |
86 | IF bkpt->flag==BKPTEXEC | |
87 | ORF ((bkpt->flag=BKPTEXEC) | |
88 | ANDF bkpt->comm[0]!=EOR | |
89 | ANDF command(bkpt->comm,':') | |
90 | ANDF --bkpt->count) | |
91 | THEN execbkpt(bkpt,execsig); execsig=0; loopcnt++; | |
92 | ELSE bkpt->count=bkpt->initcnt; rc=1; | |
93 | FI | |
94 | ELSE execsig=signo; rc=0; | |
95 | FI | |
96 | OD | |
97 | return(rc); | |
98 | } | |
99 | ||
100 | #define BPOUT 0 | |
101 | #define BPIN 1 | |
102 | INT bpstate = BPOUT; | |
103 | ||
104 | endpcs() | |
105 | { | |
106 | REG BKPTR bkptr; | |
107 | IF pid | |
108 | THEN ptrace(EXIT,pid); pid=0; userpc=1; | |
109 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
110 | DO IF bkptr->flag | |
111 | THEN bkptr->flag=BKPTSET; | |
112 | FI | |
113 | OD | |
114 | FI | |
115 | bpstate=BPOUT; | |
116 | } | |
117 | ||
118 | #ifdef VFORK | |
119 | nullsig() | |
120 | { | |
121 | ||
122 | } | |
123 | #endif | |
124 | ||
125 | setup() | |
126 | { | |
127 | close(fsym); fsym = -1; | |
128 | #ifndef VFORK | |
129 | IF (pid = fork()) == 0 | |
130 | #else | |
131 | IF (pid = vfork()) == 0 | |
132 | #endif | |
133 | THEN ptrace(SETTRC); | |
134 | #ifdef VFORK | |
135 | signal(SIGTRAP,nullsig); | |
136 | #endif | |
137 | signal(SIGINT,sigint); signal(SIGQUIT,sigqit); | |
138 | doexec(); exit(0); | |
139 | ELIF pid == -1 | |
140 | THEN error(NOFORK); | |
141 | ELSE bpwait(); readregs(); lp[0]=EOR; lp[1]=0; | |
142 | fsym=open(symfil,wtflag); | |
143 | IF errflg | |
144 | THEN printf("%s: cannot execute\n",symfil); | |
145 | endpcs(); error(0); | |
146 | FI | |
147 | FI | |
148 | bpstate=BPOUT; | |
149 | } | |
150 | ||
151 | execbkpt(bkptr,execsig) | |
152 | BKPTR bkptr; | |
153 | { | |
154 | #ifdef DEBUG | |
155 | printf("exbkpt: %d\n",bkptr->count); | |
156 | #endif | |
157 | delbp(); | |
158 | ptrace(SINGLE,pid,bkptr->loc,execsig); | |
159 | bkptr->flag=BKPTSET; | |
160 | bpwait(); chkerr(); readregs(); | |
161 | } | |
162 | ||
163 | ||
164 | doexec() | |
165 | { | |
166 | STRING argl[MAXARG]; | |
167 | CHAR args[LINSIZ]; | |
168 | REG STRING p, *ap, filnam; | |
169 | extern STRING environ; | |
170 | ||
171 | ap=argl; p=args; | |
172 | *ap++=symfil; | |
173 | REP IF rdc()==EOR THEN break; FI | |
174 | *ap = p; | |
175 | WHILE lastc!=EOR ANDF lastc!=SP ANDF lastc!=TB DO *p++=lastc; readchar(); OD | |
176 | *p++=0; filnam = *ap+1; | |
177 | IF **ap=='<' | |
178 | THEN close(0); | |
179 | IF open(filnam,0)<0 | |
180 | THEN printf("%s: cannot open\n",filnam); _exit(0); | |
181 | FI | |
182 | ELIF **ap=='>' | |
183 | THEN close(1); | |
184 | IF creat(filnam,0666)<0 | |
185 | THEN printf("%s: cannot create\n",filnam); _exit(0); | |
186 | FI | |
187 | ELSE ap++; | |
188 | FI | |
189 | PER lastc!=EOR DONE | |
190 | *ap++=0; | |
191 | execve(symfil, argl, environ); | |
192 | perror(symfil); | |
193 | } | |
194 | ||
195 | BKPTR scanbkpt(adr) | |
196 | ADDR adr; | |
197 | { | |
198 | REG BKPTR bkptr; | |
199 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
200 | DO IF bkptr->flag ANDF bkptr->loc==adr | |
201 | THEN break; | |
202 | FI | |
203 | OD | |
204 | return(bkptr); | |
205 | } | |
206 | ||
207 | delbp() | |
208 | { | |
209 | REG ADDR a; | |
210 | REG BKPTR bkptr; | |
211 | IF bpstate!=BPOUT | |
212 | THEN | |
213 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
214 | DO IF bkptr->flag | |
215 | THEN a=bkptr->loc; | |
216 | IF a < txtmap.e1 THEN | |
217 | ptrace(WIUSER,pid,a,bkptr->ins); | |
218 | ELSE | |
219 | ptrace(WDUSER,pid,a,bkptr->ins); | |
220 | FI | |
221 | FI | |
222 | OD | |
223 | bpstate=BPOUT; | |
224 | FI | |
225 | } | |
226 | ||
227 | #if defined(vax) | |
228 | #define SETBP(ins) (BPT | ((ins) &~ 0xff)) | |
229 | #else | |
230 | #define SETBP(ins) ((BPT<<24) | ((ins) & 0xffffff)) | |
231 | #endif | |
232 | ||
233 | setbp() | |
234 | { | |
235 | REG ADDR a; | |
236 | REG BKPTR bkptr; | |
237 | ||
238 | IF bpstate!=BPIN | |
239 | THEN | |
240 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
241 | DO IF bkptr->flag | |
242 | THEN a = bkptr->loc; | |
243 | IF a < txtmap.e1 THEN | |
244 | bkptr->ins = ptrace(RIUSER, pid, a); | |
245 | ptrace(WIUSER, pid, a, SETBP(bkptr->ins)); | |
246 | ELSE | |
247 | bkptr->ins = ptrace(RDUSER, pid, a); | |
248 | ptrace(WDUSER, pid, a, SETBP(bkptr->ins)); | |
249 | FI | |
250 | IF errno | |
251 | THEN printf("cannot set breakpoint: "); | |
252 | psymoff(bkptr->loc,ISYM,"\n"); | |
253 | FI | |
254 | FI | |
255 | OD | |
256 | bpstate=BPIN; | |
257 | FI | |
258 | } | |
259 | ||
260 | bpwait() | |
261 | { | |
262 | REG w; | |
263 | ADDR stat; | |
264 | ||
265 | signal(SIGINT, 1); | |
266 | WHILE (w = wait(&stat))!=pid ANDF w != -1 DONE | |
267 | signal(SIGINT,sigint); | |
268 | IF w == -1 | |
269 | THEN pid=0; | |
270 | errflg=BADWAIT; | |
271 | ELIF (stat & 0177) != 0177 | |
272 | THEN sigcode = 0; | |
273 | IF signo = stat&0177 | |
274 | THEN sigprint(); | |
275 | FI | |
276 | IF stat&0200 | |
277 | THEN printf(" - core dumped"); | |
278 | close(fcor); | |
279 | setcor(); | |
280 | FI | |
281 | pid=0; | |
282 | errflg=ENDPCS; | |
283 | ELSE signo = stat>>8; | |
284 | sigcode = ptrace(RUREGS, pid, &((struct user *)0)->u_code, 0); | |
285 | IF signo!=SIGTRAP | |
286 | THEN sigprint(); | |
287 | ELSE signo=0; | |
288 | FI | |
289 | flushbuf(); | |
290 | FI | |
291 | } | |
292 | ||
293 | readregs() | |
294 | { | |
295 | /*get REG values from pcs*/ | |
296 | REG REGPTR p; | |
297 | ||
298 | FOR p=reglist; p->rname; p++ | |
299 | DO *(ADDR *)(((ADDR)&u)+p->roffs) = | |
300 | ptrace(RUREGS, pid, p->roffs, 0); | |
301 | OD | |
302 | userpc= *(ADDR *)(((ADDR)&u)+PC); | |
303 | } |