Commit | Line | Data |
---|---|---|
7df176f7 BJ |
1 | # |
2 | /* | |
3 | * | |
4 | * UNIX debugger | |
5 | * | |
6 | */ | |
7 | ||
8 | #include "defs.h" | |
9 | SCCSID(@(#)runpcs.c 2.7); | |
10 | struct user u; | |
11 | ||
12 | ||
13 | MSG NOFORK; | |
14 | MSG ENDPCS; | |
15 | MSG BADWAIT; | |
16 | ||
17 | CHAR *lp; | |
18 | ADDR sigint; | |
19 | ADDR sigqit; | |
20 | ||
21 | /* breakpoints */ | |
22 | BKPTR bkpthead; | |
23 | ||
24 | REGLIST reglist[]; | |
25 | ||
26 | CHAR lastc; | |
27 | ||
28 | INT fcor; | |
29 | INT fsym; | |
30 | STRING errflg; | |
31 | INT errno; | |
32 | INT signo; | |
33 | ||
34 | L_INT dot; | |
35 | STRING symfil; | |
36 | INT wtflag; | |
37 | L_INT pid; | |
38 | L_INT expv; | |
39 | INT adrflg; | |
40 | L_INT loopcnt; | |
41 | ||
42 | ||
43 | ||
44 | ||
45 | ||
46 | /* service routines for sub process control */ | |
47 | ||
48 | getsig(sig) | |
49 | { return(expr(0) ? expv : sig); | |
50 | } | |
51 | ||
52 | ADDR userpc = 1; | |
53 | ||
54 | runpcs(runmode,execsig) | |
55 | { | |
56 | INT rc; | |
57 | REG BKPTR bkpt; | |
58 | IF adrflg THEN userpc=dot; FI | |
59 | printf("%s: running\n", symfil); | |
60 | ||
61 | WHILE --loopcnt>=0 | |
62 | DO | |
63 | #ifdef DEBUG | |
64 | printf("\ncontinue %x %d\n",userpc,execsig); | |
65 | #endif | |
66 | IF runmode==SINGLE | |
67 | THEN delbp(); /* hardware handles single-stepping */ | |
68 | ELSE /* continuing from a breakpoint is hard */ | |
69 | IF bkpt=scanbkpt(userpc) | |
70 | THEN execbkpt(bkpt,execsig); execsig=0; | |
71 | FI | |
72 | setbp(); | |
73 | FI | |
74 | ptrace(runmode,pid,userpc,execsig); | |
75 | bpwait(); chkerr(); execsig=0; delbp(); readregs(); | |
76 | ||
77 | IF (signo==0) ANDF (bkpt=scanbkpt(userpc)) | |
78 | THEN /* stopped by BPT instruction */ | |
79 | #ifdef DEBUG | |
80 | printf("\n BPT code; '%s'%o'%o'%d", | |
81 | bkpt->comm,bkpt->comm[0],EOR,bkpt->flag); | |
82 | #endif | |
83 | dot=bkpt->loc; | |
84 | IF bkpt->flag==BKPTEXEC | |
85 | ORF ((bkpt->flag=BKPTEXEC) | |
86 | ANDF bkpt->comm[0]!=EOR | |
87 | ANDF command(bkpt->comm,':') | |
88 | ANDF --bkpt->count) | |
89 | THEN execbkpt(bkpt,execsig); execsig=0; loopcnt++; | |
90 | ELSE bkpt->count=bkpt->initcnt; rc=1; | |
91 | FI | |
92 | ELSE execsig=signo; rc=0; | |
93 | FI | |
94 | OD | |
95 | return(rc); | |
96 | } | |
97 | ||
98 | #define BPOUT 0 | |
99 | #define BPIN 1 | |
100 | INT bpstate = BPOUT; | |
101 | ||
102 | endpcs() | |
103 | { | |
104 | REG BKPTR bkptr; | |
105 | IF pid | |
106 | THEN ptrace(EXIT,pid,0,0); pid=0; userpc=1; | |
107 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
108 | DO IF bkptr->flag | |
109 | THEN bkptr->flag=BKPTSET; | |
110 | FI | |
111 | OD | |
112 | FI | |
113 | bpstate=BPOUT; | |
114 | } | |
115 | ||
116 | #ifdef VFORK | |
117 | nullsig() | |
118 | { | |
119 | ||
120 | } | |
121 | #endif | |
122 | ||
123 | setup() | |
124 | { | |
125 | close(fsym); fsym = -1; | |
126 | #ifndef VFORK | |
127 | IF (pid = fork()) == 0 | |
128 | #else | |
129 | IF (pid = vfork()) == 0 | |
130 | #endif | |
131 | THEN ptrace(SETTRC,0,0,0); | |
132 | #ifdef VFORK | |
133 | signal(SIGTRC,nullsig); | |
134 | #endif | |
135 | signal(SIGINT,sigint); signal(SIGQUIT,sigqit); | |
136 | doexec(); exit(0); | |
137 | ELIF pid == -1 | |
138 | THEN error(NOFORK); | |
139 | ELSE bpwait(); readregs(); lp[0]=EOR; lp[1]=0; | |
140 | fsym=open(symfil,wtflag); | |
141 | IF errflg | |
142 | THEN printf("%s: cannot execute\n",symfil); | |
143 | endpcs(); error(0); | |
144 | FI | |
145 | FI | |
146 | bpstate=BPOUT; | |
147 | } | |
148 | ||
149 | execbkpt(bkptr,execsig) | |
150 | BKPTR bkptr; | |
151 | { | |
152 | #ifdef DEBUG | |
153 | printf("exbkpt: %d\n",bkptr->count); | |
154 | #endif | |
155 | delbp(); | |
156 | ptrace(SINGLE,pid,bkptr->loc,execsig); | |
157 | bkptr->flag=BKPTSET; | |
158 | bpwait(); chkerr(); readregs(); | |
159 | } | |
160 | ||
161 | ||
162 | doexec() | |
163 | { | |
164 | STRING argl[MAXARG]; | |
165 | CHAR args[LINSIZ]; | |
166 | STRING p, *ap, filnam; | |
167 | extern STRING environ; | |
168 | ap=argl; p=args; | |
169 | *ap++=symfil; | |
170 | REP IF rdc()==EOR THEN break; FI | |
171 | *ap = p; | |
172 | WHILE lastc!=EOR ANDF lastc!=SP ANDF lastc!=TB DO *p++=lastc; readchar(); OD | |
173 | *p++=0; filnam = *ap+1; | |
174 | IF **ap=='<' | |
175 | THEN close(0); | |
176 | IF open(filnam,0)<0 | |
177 | THEN printf("%s: cannot open\n",filnam); _exit(0); | |
178 | FI | |
179 | ELIF **ap=='>' | |
180 | THEN close(1); | |
181 | IF creat(filnam,0666)<0 | |
182 | THEN printf("%s: cannot create\n",filnam); _exit(0); | |
183 | FI | |
184 | ELSE ap++; | |
185 | FI | |
186 | PER lastc!=EOR DONE | |
187 | *ap++=0; | |
188 | exect(symfil, argl, environ); | |
189 | perror(symfil); | |
190 | } | |
191 | ||
192 | BKPTR scanbkpt(adr) | |
193 | ADDR adr; | |
194 | { | |
195 | REG BKPTR bkptr; | |
196 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
197 | DO IF bkptr->flag ANDF bkptr->loc==adr | |
198 | THEN break; | |
199 | FI | |
200 | OD | |
201 | return(bkptr); | |
202 | } | |
203 | ||
204 | delbp() | |
205 | { | |
206 | REG ADDR a; | |
207 | REG BKPTR bkptr; | |
208 | IF bpstate!=BPOUT | |
209 | THEN | |
210 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
211 | DO IF bkptr->flag | |
212 | THEN a=bkptr->loc; | |
213 | ptrace(WIUSER,pid,a, | |
214 | (bkptr->ins&0xFF)|(ptrace(RIUSER,pid,a,0)&~0xFF)); | |
215 | FI | |
216 | OD | |
217 | bpstate=BPOUT; | |
218 | FI | |
219 | } | |
220 | ||
221 | setbp() | |
222 | { | |
223 | REG ADDR a; | |
224 | REG BKPTR bkptr; | |
225 | ||
226 | IF bpstate!=BPIN | |
227 | THEN | |
228 | FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt | |
229 | DO IF bkptr->flag | |
230 | THEN a = bkptr->loc; | |
231 | bkptr->ins = ptrace(RIUSER, pid, a, 0); | |
232 | ptrace(WIUSER, pid, a, BPT | (bkptr->ins&~0xFF)); | |
233 | IF errno | |
234 | THEN prints("cannot set breakpoint: "); | |
235 | psymoff(bkptr->loc,ISYM,"\n"); | |
236 | FI | |
237 | FI | |
238 | OD | |
239 | bpstate=BPIN; | |
240 | FI | |
241 | } | |
242 | ||
243 | bpwait() | |
244 | { | |
245 | REG ADDR w; | |
246 | ADDR stat; | |
247 | ||
248 | signal(SIGINT, 1); | |
249 | WHILE (w = wait(&stat))!=pid ANDF w != -1 DONE | |
250 | signal(SIGINT,sigint); | |
251 | IF w == -1 | |
252 | THEN pid=0; | |
253 | errflg=BADWAIT; | |
254 | ELIF (stat & 0177) != 0177 | |
255 | THEN IF signo = stat&0177 | |
256 | THEN sigprint(); | |
257 | FI | |
258 | IF stat&0200 | |
259 | THEN prints(" - core dumped"); | |
260 | close(fcor); | |
261 | setcor(); | |
262 | FI | |
263 | pid=0; | |
264 | errflg=ENDPCS; | |
265 | ELSE signo = stat>>8; | |
266 | IF signo!=SIGTRC | |
267 | THEN sigprint(); | |
268 | ELSE signo=0; | |
269 | FI | |
270 | flushbuf(); | |
271 | FI | |
272 | } | |
273 | ||
274 | readregs() | |
275 | { | |
276 | /*get REG values from pcs*/ | |
277 | REG i; | |
278 | FOR i=24; --i>=0; | |
279 | DO *(ADDR *)(((ADDR)&u)+reglist[i].roffs) = | |
280 | ptrace(RUREGS, pid, reglist[i].roffs, 0); | |
281 | OD | |
282 | userpc= *(ADDR *)(((ADDR)&u)+PC); | |
283 | } | |
284 | ||
285 |