1 84114f06 2004-04-19 devnull /*
  2 84114f06 2004-04-19 devnull  * functions for running the debugged process
  3 84114f06 2004-04-19 devnull  */
  4 84114f06 2004-04-19 devnull 
  5 84114f06 2004-04-19 devnull #include "defs.h"
  6 84114f06 2004-04-19 devnull #include "fns.h"
  7 84114f06 2004-04-19 devnull 
  8 84114f06 2004-04-19 devnull 
  9 84114f06 2004-04-19 devnull int child;
 10 84114f06 2004-04-19 devnull int msgfd = -1;
 11 84114f06 2004-04-19 devnull int notefd = -1;
 12 84114f06 2004-04-19 devnull int pcspid = -1;
 13 84114f06 2004-04-19 devnull int pcsactive = 0;
 14 84114f06 2004-04-19 devnull 
 15 84114f06 2004-04-19 devnull void
 16 84114f06 2004-04-19 devnull setpcs(void)
 17 84114f06 2004-04-19 devnull {
 18 84114f06 2004-04-19 devnull 	char buf[128];
 19 84114f06 2004-04-19 devnull 
 20 84114f06 2004-04-19 devnull 	if(pid && pid != pcspid){
 21 84114f06 2004-04-19 devnull 		if(msgfd >= 0){
 22 84114f06 2004-04-19 devnull 			close(msgfd);
 23 84114f06 2004-04-19 devnull 			msgfd = -1;
 24 84114f06 2004-04-19 devnull 		}
 25 84114f06 2004-04-19 devnull 		if(notefd >= 0){
 26 84114f06 2004-04-19 devnull 			close(notefd);
 27 84114f06 2004-04-19 devnull 			notefd = -1;
 28 84114f06 2004-04-19 devnull 		}
 29 84114f06 2004-04-19 devnull 		pcspid = -1;
 30 84114f06 2004-04-19 devnull 		sprint(buf, "/proc/%d/ctl", pid);
 31 84114f06 2004-04-19 devnull 		msgfd = open(buf, OWRITE);
 32 84114f06 2004-04-19 devnull 		if(msgfd < 0)
 33 84114f06 2004-04-19 devnull 			error("can't open control file");
 34 84114f06 2004-04-19 devnull 		sprint(buf, "/proc/%d/note", pid);
 35 84114f06 2004-04-19 devnull 		notefd = open(buf, ORDWR);
 36 84114f06 2004-04-19 devnull 		if(notefd < 0)
 37 84114f06 2004-04-19 devnull 			error("can't open note file");
 38 84114f06 2004-04-19 devnull 		pcspid = pid;
 39 84114f06 2004-04-19 devnull 	}
 40 84114f06 2004-04-19 devnull }
 41 84114f06 2004-04-19 devnull 
 42 84114f06 2004-04-19 devnull void
 43 84114f06 2004-04-19 devnull msgpcs(char *msg)
 44 84114f06 2004-04-19 devnull {
 45 84114f06 2004-04-19 devnull 	char err[ERRMAX];
 46 84114f06 2004-04-19 devnull 
 47 84114f06 2004-04-19 devnull 	setpcs();
 48 84114f06 2004-04-19 devnull 	if(write(msgfd, msg, strlen(msg)) < 0 && !ending){
 49 84114f06 2004-04-19 devnull 		errstr(err, sizeof err);
 50 84114f06 2004-04-19 devnull 		if(strcmp(err, "interrupted") != 0)
 51 84114f06 2004-04-19 devnull 			endpcs();
 52 84114f06 2004-04-19 devnull 		errors("can't write control file", err);
 53 84114f06 2004-04-19 devnull 	}
 54 84114f06 2004-04-19 devnull }
 55 84114f06 2004-04-19 devnull 
 56 84114f06 2004-04-19 devnull /*
 57 84114f06 2004-04-19 devnull  * empty the note buffer and toss pending breakpoint notes
 58 84114f06 2004-04-19 devnull  */
 59 84114f06 2004-04-19 devnull void
 60 84114f06 2004-04-19 devnull unloadnote(void)
 61 84114f06 2004-04-19 devnull {
 62 84114f06 2004-04-19 devnull 	char err[ERRMAX];
 63 84114f06 2004-04-19 devnull 
 64 84114f06 2004-04-19 devnull 	setpcs();
 65 84114f06 2004-04-19 devnull 	for(; nnote<NNOTE; nnote++){
 66 84114f06 2004-04-19 devnull 		switch(read(notefd, note[nnote], sizeof note[nnote])){
 67 84114f06 2004-04-19 devnull 		case -1:
 68 84114f06 2004-04-19 devnull 			errstr(err, sizeof err);
 69 84114f06 2004-04-19 devnull 			if(strcmp(err, "interrupted") != 0)
 70 84114f06 2004-04-19 devnull 				endpcs();
 71 84114f06 2004-04-19 devnull 			errors("can't read note file", err);
 72 84114f06 2004-04-19 devnull 		case 0:
 73 84114f06 2004-04-19 devnull 			return;
 74 84114f06 2004-04-19 devnull 		}
 75 84114f06 2004-04-19 devnull 		note[nnote][ERRMAX-1] = '\0';
 76 84114f06 2004-04-19 devnull 		if(strncmp(note[nnote], "sys: breakpoint", 15) == 0)
 77 84114f06 2004-04-19 devnull 			--nnote;
 78 84114f06 2004-04-19 devnull 	}
 79 84114f06 2004-04-19 devnull }
 80 84114f06 2004-04-19 devnull 
 81 84114f06 2004-04-19 devnull /*
 82 84114f06 2004-04-19 devnull  * reload the note buffer
 83 84114f06 2004-04-19 devnull  */
 84 84114f06 2004-04-19 devnull void
 85 84114f06 2004-04-19 devnull loadnote(void)
 86 84114f06 2004-04-19 devnull {
 87 84114f06 2004-04-19 devnull 	int i;
 88 84114f06 2004-04-19 devnull 	char err[ERRMAX];
 89 84114f06 2004-04-19 devnull 
 90 84114f06 2004-04-19 devnull 	setpcs();
 91 84114f06 2004-04-19 devnull 	for(i=0; i<nnote; i++){
 92 84114f06 2004-04-19 devnull 		if(write(notefd, note[i], strlen(note[i])) < 0){
 93 84114f06 2004-04-19 devnull 			errstr(err, sizeof err);
 94 84114f06 2004-04-19 devnull 			if(strcmp(err, "interrupted") != 0)
 95 84114f06 2004-04-19 devnull 				endpcs();
 96 84114f06 2004-04-19 devnull 			errors("can't write note file", err);
 97 84114f06 2004-04-19 devnull 		}
 98 84114f06 2004-04-19 devnull 	}
 99 84114f06 2004-04-19 devnull 	nnote = 0;
100 84114f06 2004-04-19 devnull }
101 84114f06 2004-04-19 devnull 
102 84114f06 2004-04-19 devnull void
103 84114f06 2004-04-19 devnull notes(void)
104 84114f06 2004-04-19 devnull {
105 84114f06 2004-04-19 devnull 	int n;
106 84114f06 2004-04-19 devnull 
107 84114f06 2004-04-19 devnull 	if(nnote == 0)
108 84114f06 2004-04-19 devnull 		return;
109 84114f06 2004-04-19 devnull 	dprint("notes:\n");
110 84114f06 2004-04-19 devnull 	for(n=0; n<nnote; n++)
111 84114f06 2004-04-19 devnull 		dprint("%d:\t%s\n", n, note[n]);
112 84114f06 2004-04-19 devnull }
113 84114f06 2004-04-19 devnull 
114 84114f06 2004-04-19 devnull void
115 84114f06 2004-04-19 devnull killpcs(void)
116 84114f06 2004-04-19 devnull {
117 84114f06 2004-04-19 devnull 	msgpcs("kill");
118 84114f06 2004-04-19 devnull }
119 84114f06 2004-04-19 devnull 
120 84114f06 2004-04-19 devnull void
121 84114f06 2004-04-19 devnull grab(void)
122 84114f06 2004-04-19 devnull {
123 84114f06 2004-04-19 devnull 	flush();
124 84114f06 2004-04-19 devnull 	msgpcs("stop");
125 84114f06 2004-04-19 devnull 	bpwait();
126 84114f06 2004-04-19 devnull }
127 84114f06 2004-04-19 devnull 
128 84114f06 2004-04-19 devnull void
129 84114f06 2004-04-19 devnull ungrab(void)
130 84114f06 2004-04-19 devnull {
131 84114f06 2004-04-19 devnull 	msgpcs("start");
132 84114f06 2004-04-19 devnull }
133 84114f06 2004-04-19 devnull 
134 84114f06 2004-04-19 devnull void
135 84114f06 2004-04-19 devnull doexec(void)
136 84114f06 2004-04-19 devnull {
137 84114f06 2004-04-19 devnull 	char *argl[MAXARG];
138 84114f06 2004-04-19 devnull 	char args[LINSIZ];
139 84114f06 2004-04-19 devnull 	char *p;
140 84114f06 2004-04-19 devnull 	char **ap;
141 84114f06 2004-04-19 devnull 	char *thisarg;
142 84114f06 2004-04-19 devnull 
143 84114f06 2004-04-19 devnull 	ap = argl;
144 84114f06 2004-04-19 devnull 	p = args;
145 84114f06 2004-04-19 devnull 	*ap++ = symfil;
146 84114f06 2004-04-19 devnull 	for (rdc(); lastc != EOR;) {
147 84114f06 2004-04-19 devnull 		thisarg = p;
148 84114f06 2004-04-19 devnull 		if (lastc == '<' || lastc == '>') {
149 84114f06 2004-04-19 devnull 			*p++ = lastc;
150 84114f06 2004-04-19 devnull 			rdc();
151 84114f06 2004-04-19 devnull 		}
152 84114f06 2004-04-19 devnull 		while (lastc != EOR && lastc != SPC && lastc != TB) {
153 84114f06 2004-04-19 devnull 			*p++ = lastc;
154 84114f06 2004-04-19 devnull 			readchar();
155 84114f06 2004-04-19 devnull 		}
156 84114f06 2004-04-19 devnull 		if (lastc == SPC || lastc == TB)
157 84114f06 2004-04-19 devnull 			rdc();
158 84114f06 2004-04-19 devnull 		*p++ = 0;
159 84114f06 2004-04-19 devnull 		if (*thisarg == '<') {
160 84114f06 2004-04-19 devnull 			close(0);
161 84114f06 2004-04-19 devnull 			if (open(&thisarg[1], OREAD) < 0) {
162 84114f06 2004-04-19 devnull 				print("%s: cannot open\n", &thisarg[1]);
163 84114f06 2004-04-19 devnull 				_exits(0);
164 84114f06 2004-04-19 devnull 			}
165 84114f06 2004-04-19 devnull 		}
166 84114f06 2004-04-19 devnull 		else if (*thisarg == '>') {
167 84114f06 2004-04-19 devnull 			close(1);
168 84114f06 2004-04-19 devnull 			if (create(&thisarg[1], OWRITE, 0666) < 0) {
169 84114f06 2004-04-19 devnull 				print("%s: cannot create\n", &thisarg[1]);
170 84114f06 2004-04-19 devnull 				_exits(0);
171 84114f06 2004-04-19 devnull 			}
172 84114f06 2004-04-19 devnull 		}
173 84114f06 2004-04-19 devnull 		else
174 84114f06 2004-04-19 devnull 			*ap++ = thisarg;
175 84114f06 2004-04-19 devnull 	}
176 84114f06 2004-04-19 devnull 	*ap = 0;
177 84114f06 2004-04-19 devnull 	exec(symfil, argl);
178 84114f06 2004-04-19 devnull 	perror(symfil);
179 84114f06 2004-04-19 devnull }
180 84114f06 2004-04-19 devnull 
181 84114f06 2004-04-19 devnull char	procname[100];
182 84114f06 2004-04-19 devnull 
183 84114f06 2004-04-19 devnull void
184 84114f06 2004-04-19 devnull startpcs(void)
185 84114f06 2004-04-19 devnull {
186 84114f06 2004-04-19 devnull 	if ((pid = fork()) == 0) {
187 84114f06 2004-04-19 devnull 		pid = getpid();
188 84114f06 2004-04-19 devnull 		msgpcs("hang");
189 84114f06 2004-04-19 devnull 		doexec();
190 84114f06 2004-04-19 devnull 		exits(0);
191 84114f06 2004-04-19 devnull 	}
192 84114f06 2004-04-19 devnull 
193 84114f06 2004-04-19 devnull 	if (pid == -1)
194 84114f06 2004-04-19 devnull 		error("can't fork");
195 84114f06 2004-04-19 devnull 	child++;
196 84114f06 2004-04-19 devnull 	sprint(procname, "/proc/%d/mem", pid);
197 84114f06 2004-04-19 devnull 	corfil = procname;
198 84114f06 2004-04-19 devnull 	msgpcs("waitstop");
199 84114f06 2004-04-19 devnull 	bpwait();
200 84114f06 2004-04-19 devnull 	if (adrflg)
201 84114f06 2004-04-19 devnull 		rput(correg, mach->pc, adrval);
202 84114f06 2004-04-19 devnull 	while (rdc() != EOR)
203 84114f06 2004-04-19 devnull 		;
204 84114f06 2004-04-19 devnull 	reread();
205 84114f06 2004-04-19 devnull }
206 84114f06 2004-04-19 devnull 
207 84114f06 2004-04-19 devnull void
208 84114f06 2004-04-19 devnull runstep(ulong loc, int keepnote)
209 84114f06 2004-04-19 devnull {
210 84114f06 2004-04-19 devnull 	int nfoll;
211 443d6288 2012-02-19 rsc 	ADDR foll[3];
212 84114f06 2004-04-19 devnull 	BKPT bkpt[3];
213 84114f06 2004-04-19 devnull 	int i;
214 84114f06 2004-04-19 devnull 
215 84114f06 2004-04-19 devnull 	if(mach->foll == 0){
216 84114f06 2004-04-19 devnull 		dprint("stepping unimplemented; assuming not a branch\n");
217 84114f06 2004-04-19 devnull 		nfoll = 1;
218 84114f06 2004-04-19 devnull 		foll[0] = loc+mach->pcquant;
219 84114f06 2004-04-19 devnull 	}else {
220 84114f06 2004-04-19 devnull 		nfoll = mach->foll(cormap, correg, loc, foll);
221 84114f06 2004-04-19 devnull 		if (nfoll < 0)
222 84114f06 2004-04-19 devnull 			error("%r");
223 84114f06 2004-04-19 devnull 	}
224 84114f06 2004-04-19 devnull 	memset(bkpt, 0, sizeof bkpt);
225 84114f06 2004-04-19 devnull 	for(i=0; i<nfoll; i++){
226 84114f06 2004-04-19 devnull 		if(foll[i] == loc)
227 84114f06 2004-04-19 devnull 			error("can't single step: next instruction is dot");
228 84114f06 2004-04-19 devnull 		bkpt[i].loc = foll[i];
229 84114f06 2004-04-19 devnull 		bkput(&bkpt[i], 1);
230 84114f06 2004-04-19 devnull 	}
231 84114f06 2004-04-19 devnull 	runrun(keepnote);
232 84114f06 2004-04-19 devnull 	for(i=0; i<nfoll; i++)
233 84114f06 2004-04-19 devnull 		bkput(&bkpt[i], 0);
234 84114f06 2004-04-19 devnull }
235 84114f06 2004-04-19 devnull 
236 84114f06 2004-04-19 devnull void
237 84114f06 2004-04-19 devnull bpwait(void)
238 84114f06 2004-04-19 devnull {
239 84114f06 2004-04-19 devnull 	setcor();
240 84114f06 2004-04-19 devnull 	unloadnote();
241 84114f06 2004-04-19 devnull }
242 84114f06 2004-04-19 devnull 
243 84114f06 2004-04-19 devnull void
244 84114f06 2004-04-19 devnull runrun(int keepnote)
245 84114f06 2004-04-19 devnull {
246 84114f06 2004-04-19 devnull 	int on;
247 84114f06 2004-04-19 devnull 
248 84114f06 2004-04-19 devnull 	on = nnote;
249 84114f06 2004-04-19 devnull 	unloadnote();
250 84114f06 2004-04-19 devnull 	if(on != nnote){
251 84114f06 2004-04-19 devnull 		notes();
252 84114f06 2004-04-19 devnull 		error("not running: new notes pending");
253 84114f06 2004-04-19 devnull 	}
254 84114f06 2004-04-19 devnull 	if(keepnote)
255 84114f06 2004-04-19 devnull 		loadnote();
256 84114f06 2004-04-19 devnull 	else
257 84114f06 2004-04-19 devnull 		nnote = 0;
258 84114f06 2004-04-19 devnull 	flush();
259 84114f06 2004-04-19 devnull 	msgpcs("startstop");
260 84114f06 2004-04-19 devnull 	bpwait();
261 84114f06 2004-04-19 devnull }
262 84114f06 2004-04-19 devnull 
263 84114f06 2004-04-19 devnull void
264 84114f06 2004-04-19 devnull bkput(BKPT *bp, int install)
265 84114f06 2004-04-19 devnull {
266 84114f06 2004-04-19 devnull 	char buf[256];
267 84114f06 2004-04-19 devnull 	ulong loc;
268 84114f06 2004-04-19 devnull 	int ret;
269 84114f06 2004-04-19 devnull 
270 84114f06 2004-04-19 devnull 	errstr(buf, sizeof buf);
271 84114f06 2004-04-19 devnull /*
272 84114f06 2004-04-19 devnull 	if(mach->bpfix)
273 84114f06 2004-04-19 devnull 		loc = (*mach->bpfix)(bp->loc);
274 84114f06 2004-04-19 devnull 	else
275 84114f06 2004-04-19 devnull */
276 84114f06 2004-04-19 devnull 	loc = bp->loc;
277 84114f06 2004-04-19 devnull 	if(install){
278 84114f06 2004-04-19 devnull 		ret = get1(cormap, loc, bp->save, mach->bpsize);
279 84114f06 2004-04-19 devnull 		if (ret > 0)
280 84114f06 2004-04-19 devnull 			ret = put1(cormap, loc, mach->bpinst, mach->bpsize);
281 84114f06 2004-04-19 devnull 	}else
282 84114f06 2004-04-19 devnull 		ret = put1(cormap, loc, bp->save, mach->bpsize);
283 84114f06 2004-04-19 devnull 	if(ret < 0){
284 84114f06 2004-04-19 devnull 		sprint(buf, "can't set breakpoint at %#llux: %r", bp->loc);
285 84114f06 2004-04-19 devnull 		print(buf);
286 84114f06 2004-04-19 devnull 		read(0, buf, 100);
287 84114f06 2004-04-19 devnull 	}
288 84114f06 2004-04-19 devnull }