1/* 2 * Copyright (c) 1993 Jan-Simon Pendry 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Jan-Simon Pendry. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)procfs_ctl.c 8.3 (Berkeley) 1/21/94 38 *
| 1/* 2 * Copyright (c) 1993 Jan-Simon Pendry 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Jan-Simon Pendry. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)procfs_ctl.c 8.3 (Berkeley) 1/21/94 38 *
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54 55/* 56 * True iff process (p) is in trace wait state 57 * relative to process (curp) 58 */ 59#define TRACE_WAIT_P(curp, p) \ 60 ((p)->p_stat == SSTOP && \ 61 (p)->p_pptr == (curp) && \ 62 ((p)->p_flag & P_TRACED)) 63 64#ifdef notdef 65#define FIX_SSTEP(p) { \ 66 procfs_fix_sstep(p); \ 67 } \ 68} 69#else 70#define FIX_SSTEP(p) 71#endif 72 73#define PROCFS_CTL_ATTACH 1 74#define PROCFS_CTL_DETACH 2 75#define PROCFS_CTL_STEP 3 76#define PROCFS_CTL_RUN 4 77#define PROCFS_CTL_WAIT 5 78 79static vfs_namemap_t ctlnames[] = { 80 /* special /proc commands */ 81 { "attach", PROCFS_CTL_ATTACH }, 82 { "detach", PROCFS_CTL_DETACH }, 83 { "step", PROCFS_CTL_STEP }, 84 { "run", PROCFS_CTL_RUN }, 85 { "wait", PROCFS_CTL_WAIT }, 86 { 0 }, 87}; 88 89static vfs_namemap_t signames[] = { 90 /* regular signal names */ 91 { "hup", SIGHUP }, { "int", SIGINT }, 92 { "quit", SIGQUIT }, { "ill", SIGILL }, 93 { "trap", SIGTRAP }, { "abrt", SIGABRT }, 94 { "iot", SIGIOT }, { "emt", SIGEMT }, 95 { "fpe", SIGFPE }, { "kill", SIGKILL }, 96 { "bus", SIGBUS }, { "segv", SIGSEGV }, 97 { "sys", SIGSYS }, { "pipe", SIGPIPE }, 98 { "alrm", SIGALRM }, { "term", SIGTERM }, 99 { "urg", SIGURG }, { "stop", SIGSTOP }, 100 { "tstp", SIGTSTP }, { "cont", SIGCONT }, 101 { "chld", SIGCHLD }, { "ttin", SIGTTIN }, 102 { "ttou", SIGTTOU }, { "io", SIGIO }, 103 { "xcpu", SIGXCPU }, { "xfsz", SIGXFSZ }, 104 { "vtalrm", SIGVTALRM }, { "prof", SIGPROF }, 105 { "winch", SIGWINCH }, { "info", SIGINFO }, 106 { "usr1", SIGUSR1 }, { "usr2", SIGUSR2 }, 107 { 0 }, 108}; 109 110static int 111procfs_control(curp, p, op) 112 struct proc *curp; 113 struct proc *p; 114 int op; 115{ 116 int error; 117 118 /* 119 * Attach - attaches the target process for debugging 120 * by the calling process. 121 */ 122 if (op == PROCFS_CTL_ATTACH) { 123 /* check whether already being traced */ 124 if (p->p_flag & P_TRACED) 125 return (EBUSY); 126 127 /* can't trace yourself! */ 128 if (p->p_pid == curp->p_pid) 129 return (EINVAL); 130 131 /* 132 * Go ahead and set the trace flag. 133 * Save the old parent (it's reset in 134 * _DETACH, and also in kern_exit.c:wait4() 135 * Reparent the process so that the tracing 136 * proc gets to see all the action. 137 * Stop the target. 138 */ 139 p->p_flag |= P_TRACED; 140 faultin(p); 141 p->p_xstat = 0; /* XXX ? */ 142 if (p->p_pptr != curp) { 143 p->p_oppid = p->p_pptr->p_pid; 144 proc_reparent(p, curp); 145 } 146 psignal(p, SIGSTOP); 147 return (0); 148 } 149 150 /* 151 * Target process must be stopped, owned by (curp) and 152 * be set up for tracing (P_TRACED flag set). 153 * Allow DETACH to take place at any time for sanity. 154 * Allow WAIT any time, of course. 155 */ 156 switch (op) { 157 case PROCFS_CTL_DETACH: 158 case PROCFS_CTL_WAIT: 159 break; 160 161 default: 162 if (!TRACE_WAIT_P(curp, p)) 163 return (EBUSY); 164 } 165 166 /* 167 * do single-step fixup if needed 168 */ 169 FIX_SSTEP(p); 170 171 /* 172 * Don't deliver any signal by default. 173 * To continue with a signal, just send 174 * the signal name to the ctl file 175 */ 176 p->p_xstat = 0; 177 178 switch (op) { 179 /* 180 * Detach. Cleans up the target process, reparent it if possible 181 * and set it running once more. 182 */ 183 case PROCFS_CTL_DETACH: 184 /* if not being traced, then this is a painless no-op */ 185 if ((p->p_flag & P_TRACED) == 0) 186 return (0); 187 188 /* not being traced any more */ 189 p->p_flag &= ~P_TRACED; 190 191 /* remove pending SIGTRAP, else the process will die */ 192 p->p_siglist &= ~sigmask (SIGTRAP); 193 194 /* give process back to original parent */ 195 if (p->p_oppid != p->p_pptr->p_pid) { 196 struct proc *pp; 197 198 pp = pfind(p->p_oppid); 199 if (pp) 200 proc_reparent(p, pp); 201 } 202 203 p->p_oppid = 0; 204 p->p_flag &= ~P_WAITED; /* XXX ? */ 205 wakeup((caddr_t) curp); /* XXX for CTL_WAIT below ? */ 206 207 break; 208 209 /* 210 * Step. Let the target process execute a single instruction. 211 */ 212 case PROCFS_CTL_STEP: 213 procfs_sstep(p); 214 break; 215 216 /* 217 * Run. Let the target process continue running until a breakpoint 218 * or some other trap. 219 */ 220 case PROCFS_CTL_RUN: 221 break; 222 223 /* 224 * Wait for the target process to stop. 225 * If the target is not being traced then just wait 226 * to enter 227 */ 228 case PROCFS_CTL_WAIT: 229 error = 0; 230 if (p->p_flag & P_TRACED) { 231 while (error == 0 && 232 (p->p_stat != SSTOP) && 233 (p->p_flag & P_TRACED) && 234 (p->p_pptr == curp)) { 235 error = tsleep((caddr_t) p, 236 PWAIT|PCATCH, "procfsx", 0); 237 } 238 if (error == 0 && !TRACE_WAIT_P(curp, p)) 239 error = EBUSY; 240 } else { 241 while (error == 0 && p->p_stat != SSTOP) { 242 error = tsleep((caddr_t) p, 243 PWAIT|PCATCH, "procfs", 0); 244 } 245 } 246 return (error); 247 248 default: 249 panic("procfs_control"); 250 } 251 252 if (p->p_stat == SSTOP) 253 setrunnable(p); 254 return (0); 255} 256 257int 258procfs_doctl(curp, p, pfs, uio) 259 struct proc *curp; 260 struct pfsnode *pfs; 261 struct uio *uio; 262 struct proc *p; 263{ 264 int xlen; 265 int error; 266 char msg[PROCFS_CTLLEN+1]; 267 vfs_namemap_t *nm; 268 269 if (uio->uio_rw != UIO_WRITE) 270 return (EOPNOTSUPP); 271 272 xlen = PROCFS_CTLLEN; 273 error = vfs_getuserstr(uio, msg, &xlen); 274 if (error) 275 return (error); 276 277 /* 278 * Map signal names into signal generation 279 * or debug control. Unknown commands and/or signals 280 * return EOPNOTSUPP. 281 * 282 * Sending a signal while the process is being debugged 283 * also has the side effect of letting the target continue 284 * to run. There is no way to single-step a signal delivery. 285 */ 286 error = EOPNOTSUPP; 287 288 nm = vfs_findname(ctlnames, msg, xlen); 289 if (nm) { 290 error = procfs_control(curp, p, nm->nm_val); 291 } else { 292 nm = vfs_findname(signames, msg, xlen); 293 if (nm) { 294 if (TRACE_WAIT_P(curp, p)) { 295 p->p_xstat = nm->nm_val; 296 FIX_SSTEP(p); 297 setrunnable(p); 298 } else { 299 psignal(p, nm->nm_val); 300 } 301 error = 0; 302 } 303 } 304 305 return (error); 306}
| 59 60/* 61 * True iff process (p) is in trace wait state 62 * relative to process (curp) 63 */ 64#define TRACE_WAIT_P(curp, p) \ 65 ((p)->p_stat == SSTOP && \ 66 (p)->p_pptr == (curp) && \ 67 ((p)->p_flag & P_TRACED)) 68 69#ifdef notdef 70#define FIX_SSTEP(p) { \ 71 procfs_fix_sstep(p); \ 72 } \ 73} 74#else 75#define FIX_SSTEP(p) 76#endif 77 78#define PROCFS_CTL_ATTACH 1 79#define PROCFS_CTL_DETACH 2 80#define PROCFS_CTL_STEP 3 81#define PROCFS_CTL_RUN 4 82#define PROCFS_CTL_WAIT 5 83 84static vfs_namemap_t ctlnames[] = { 85 /* special /proc commands */ 86 { "attach", PROCFS_CTL_ATTACH }, 87 { "detach", PROCFS_CTL_DETACH }, 88 { "step", PROCFS_CTL_STEP }, 89 { "run", PROCFS_CTL_RUN }, 90 { "wait", PROCFS_CTL_WAIT }, 91 { 0 }, 92}; 93 94static vfs_namemap_t signames[] = { 95 /* regular signal names */ 96 { "hup", SIGHUP }, { "int", SIGINT }, 97 { "quit", SIGQUIT }, { "ill", SIGILL }, 98 { "trap", SIGTRAP }, { "abrt", SIGABRT }, 99 { "iot", SIGIOT }, { "emt", SIGEMT }, 100 { "fpe", SIGFPE }, { "kill", SIGKILL }, 101 { "bus", SIGBUS }, { "segv", SIGSEGV }, 102 { "sys", SIGSYS }, { "pipe", SIGPIPE }, 103 { "alrm", SIGALRM }, { "term", SIGTERM }, 104 { "urg", SIGURG }, { "stop", SIGSTOP }, 105 { "tstp", SIGTSTP }, { "cont", SIGCONT }, 106 { "chld", SIGCHLD }, { "ttin", SIGTTIN }, 107 { "ttou", SIGTTOU }, { "io", SIGIO }, 108 { "xcpu", SIGXCPU }, { "xfsz", SIGXFSZ }, 109 { "vtalrm", SIGVTALRM }, { "prof", SIGPROF }, 110 { "winch", SIGWINCH }, { "info", SIGINFO }, 111 { "usr1", SIGUSR1 }, { "usr2", SIGUSR2 }, 112 { 0 }, 113}; 114 115static int 116procfs_control(curp, p, op) 117 struct proc *curp; 118 struct proc *p; 119 int op; 120{ 121 int error; 122 123 /* 124 * Attach - attaches the target process for debugging 125 * by the calling process. 126 */ 127 if (op == PROCFS_CTL_ATTACH) { 128 /* check whether already being traced */ 129 if (p->p_flag & P_TRACED) 130 return (EBUSY); 131 132 /* can't trace yourself! */ 133 if (p->p_pid == curp->p_pid) 134 return (EINVAL); 135 136 /* 137 * Go ahead and set the trace flag. 138 * Save the old parent (it's reset in 139 * _DETACH, and also in kern_exit.c:wait4() 140 * Reparent the process so that the tracing 141 * proc gets to see all the action. 142 * Stop the target. 143 */ 144 p->p_flag |= P_TRACED; 145 faultin(p); 146 p->p_xstat = 0; /* XXX ? */ 147 if (p->p_pptr != curp) { 148 p->p_oppid = p->p_pptr->p_pid; 149 proc_reparent(p, curp); 150 } 151 psignal(p, SIGSTOP); 152 return (0); 153 } 154 155 /* 156 * Target process must be stopped, owned by (curp) and 157 * be set up for tracing (P_TRACED flag set). 158 * Allow DETACH to take place at any time for sanity. 159 * Allow WAIT any time, of course. 160 */ 161 switch (op) { 162 case PROCFS_CTL_DETACH: 163 case PROCFS_CTL_WAIT: 164 break; 165 166 default: 167 if (!TRACE_WAIT_P(curp, p)) 168 return (EBUSY); 169 } 170 171 /* 172 * do single-step fixup if needed 173 */ 174 FIX_SSTEP(p); 175 176 /* 177 * Don't deliver any signal by default. 178 * To continue with a signal, just send 179 * the signal name to the ctl file 180 */ 181 p->p_xstat = 0; 182 183 switch (op) { 184 /* 185 * Detach. Cleans up the target process, reparent it if possible 186 * and set it running once more. 187 */ 188 case PROCFS_CTL_DETACH: 189 /* if not being traced, then this is a painless no-op */ 190 if ((p->p_flag & P_TRACED) == 0) 191 return (0); 192 193 /* not being traced any more */ 194 p->p_flag &= ~P_TRACED; 195 196 /* remove pending SIGTRAP, else the process will die */ 197 p->p_siglist &= ~sigmask (SIGTRAP); 198 199 /* give process back to original parent */ 200 if (p->p_oppid != p->p_pptr->p_pid) { 201 struct proc *pp; 202 203 pp = pfind(p->p_oppid); 204 if (pp) 205 proc_reparent(p, pp); 206 } 207 208 p->p_oppid = 0; 209 p->p_flag &= ~P_WAITED; /* XXX ? */ 210 wakeup((caddr_t) curp); /* XXX for CTL_WAIT below ? */ 211 212 break; 213 214 /* 215 * Step. Let the target process execute a single instruction. 216 */ 217 case PROCFS_CTL_STEP: 218 procfs_sstep(p); 219 break; 220 221 /* 222 * Run. Let the target process continue running until a breakpoint 223 * or some other trap. 224 */ 225 case PROCFS_CTL_RUN: 226 break; 227 228 /* 229 * Wait for the target process to stop. 230 * If the target is not being traced then just wait 231 * to enter 232 */ 233 case PROCFS_CTL_WAIT: 234 error = 0; 235 if (p->p_flag & P_TRACED) { 236 while (error == 0 && 237 (p->p_stat != SSTOP) && 238 (p->p_flag & P_TRACED) && 239 (p->p_pptr == curp)) { 240 error = tsleep((caddr_t) p, 241 PWAIT|PCATCH, "procfsx", 0); 242 } 243 if (error == 0 && !TRACE_WAIT_P(curp, p)) 244 error = EBUSY; 245 } else { 246 while (error == 0 && p->p_stat != SSTOP) { 247 error = tsleep((caddr_t) p, 248 PWAIT|PCATCH, "procfs", 0); 249 } 250 } 251 return (error); 252 253 default: 254 panic("procfs_control"); 255 } 256 257 if (p->p_stat == SSTOP) 258 setrunnable(p); 259 return (0); 260} 261 262int 263procfs_doctl(curp, p, pfs, uio) 264 struct proc *curp; 265 struct pfsnode *pfs; 266 struct uio *uio; 267 struct proc *p; 268{ 269 int xlen; 270 int error; 271 char msg[PROCFS_CTLLEN+1]; 272 vfs_namemap_t *nm; 273 274 if (uio->uio_rw != UIO_WRITE) 275 return (EOPNOTSUPP); 276 277 xlen = PROCFS_CTLLEN; 278 error = vfs_getuserstr(uio, msg, &xlen); 279 if (error) 280 return (error); 281 282 /* 283 * Map signal names into signal generation 284 * or debug control. Unknown commands and/or signals 285 * return EOPNOTSUPP. 286 * 287 * Sending a signal while the process is being debugged 288 * also has the side effect of letting the target continue 289 * to run. There is no way to single-step a signal delivery. 290 */ 291 error = EOPNOTSUPP; 292 293 nm = vfs_findname(ctlnames, msg, xlen); 294 if (nm) { 295 error = procfs_control(curp, p, nm->nm_val); 296 } else { 297 nm = vfs_findname(signames, msg, xlen); 298 if (nm) { 299 if (TRACE_WAIT_P(curp, p)) { 300 p->p_xstat = nm->nm_val; 301 FIX_SSTEP(p); 302 setrunnable(p); 303 } else { 304 psignal(p, nm->nm_val); 305 } 306 error = 0; 307 } 308 } 309 310 return (error); 311}
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