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22e155fc DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | char copyright[] = | |
9 | "@(#) Copyright (c) 1983 Regents of the University of California.\n\ | |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
68d13ee3 | 13 | #ifndef lint |
c4a87a78 | 14 | static char sccsid[] = "@(#)gcore.c 5.3 (Berkeley) %G%"; |
22e155fc | 15 | #endif not lint |
4f626618 KM |
16 | |
17 | /* | |
18 | * gcore - get core images of running processes | |
19 | * | |
20 | * Author: Eric Cooper | |
21 | * Written: Fall 1981. | |
22 | * | |
23 | * Inspired by a version 6 program by Len Levin, 1978. | |
24 | * Several pieces of code lifted from Bill Joy's 4BSD ps. | |
25 | * | |
26 | * Permission to copy or modify this program in whole or in part is hereby | |
27 | * granted, provided that the above credits are preserved. | |
28 | * | |
29 | * This code performs a simple simulation of the virtual memory system in user | |
30 | * code. If the virtual memory system changes, this program must be modified | |
31 | * accordingly. It must also be recompiled whenever system data structures | |
32 | * change. | |
33 | */ | |
34 | #include <stdio.h> | |
35 | #include <nlist.h> | |
36 | #include <sys/param.h> | |
37 | #include <sys/dir.h> | |
38 | #include <sys/user.h> | |
39 | #include <sys/proc.h> | |
57ee57ff | 40 | #include <machine/pte.h> |
4f626618 KM |
41 | #include <sys/vm.h> |
42 | #include <setjmp.h> | |
43 | ||
44 | /* Various macros for efficiency. */ | |
45 | ||
46 | #define min(a, b) (a < b ? a : b) | |
47 | ||
48 | #define Seek(f, pos) {\ | |
49 | if (lseek(f, (long) (pos), 0) != (long) (pos)) \ | |
50 | panic("seek error"); \ | |
51 | } | |
52 | ||
53 | #define Read(f, addr, n) {\ | |
54 | if (read(f, (char *) (addr), (int) (n)) != (int) (n)) \ | |
55 | panic("read error"); \ | |
56 | } | |
57 | ||
58 | #define Get(f, pos, addr, n) {\ | |
59 | Seek(f, pos); \ | |
60 | Read(f, addr, n); \ | |
61 | } | |
62 | ||
63 | struct nlist nl[] = { | |
64 | { "_proc" }, | |
65 | #define X_PROC 0 | |
66 | { "_Usrptmap" }, | |
67 | #define X_USRPTMA 1 | |
68 | { "_usrpt" }, | |
69 | #define X_USRPT 2 | |
70 | { "_nswap" }, | |
71 | #define X_NSWAP 3 | |
72 | { "_nproc" }, | |
73 | #define X_NPROC 4 | |
68d13ee3 SL |
74 | { "_dmmin" }, |
75 | #define X_DMMIN 5 | |
76 | { "_dmmax" }, | |
77 | #define X_DMMAX 6 | |
4f626618 KM |
78 | { 0 }, |
79 | }; | |
80 | ||
81 | #define FEW 20 /* for fewer system calls */ | |
82 | struct proc proc[FEW]; | |
83 | ||
84 | union { | |
85 | struct user user; | |
86 | char upages[UPAGES][NBPG]; | |
87 | } user; | |
88 | #define u user.user | |
89 | #define uarea user.upages | |
90 | ||
91 | #define NLIST "/vmunix" | |
92 | #define KMEM "/dev/kmem" | |
93 | #define MEM "/dev/mem" | |
94 | #define SWAP "/dev/drum" /* "/dev/swap" on some systems */ | |
95 | ||
96 | int nproc; | |
97 | int nswap; | |
68d13ee3 | 98 | int dmmin, dmmax; |
4f626618 KM |
99 | struct pte *Usrptmap, *usrpt; |
100 | char coref[20]; | |
101 | int kmem, mem, swap, cor; | |
102 | jmp_buf cont_frame; | |
103 | ||
104 | main(argc, argv) | |
105 | int argc; | |
106 | char **argv; | |
107 | { | |
108 | register int i, j; | |
109 | register struct proc *p; | |
110 | off_t procbase, procp; | |
111 | int pid, uid; | |
112 | char c; | |
113 | ||
114 | if (argc < 2) { | |
115 | printf("Usage: %s pid ...\n", argv[0]); | |
116 | exit(1); | |
117 | } | |
118 | openfiles(); | |
119 | getkvars(); | |
120 | procbase = getw(nl[X_PROC].n_value); | |
121 | nproc = getw(nl[X_NPROC].n_value); | |
122 | nswap = getw(nl[X_NSWAP].n_value); | |
68d13ee3 SL |
123 | dmmin = getw(nl[X_DMMIN].n_value); |
124 | dmmax = getw(nl[X_DMMAX].n_value); | |
4f626618 KM |
125 | while (--argc > 0) { |
126 | if ((pid = atoi(*++argv)) <= 0 || setjmp(cont_frame)) | |
127 | continue; | |
128 | printf("%d: ", pid); | |
129 | procp = procbase; | |
130 | for (i = 0; i < nproc; i += FEW) { | |
131 | Seek(kmem, procp); | |
132 | j = nproc - i; | |
133 | if (j > FEW) | |
134 | j = FEW; | |
135 | j *= sizeof(struct proc); | |
136 | Read(kmem, (char *) proc, j); | |
137 | procp += j; | |
138 | for (j = j / sizeof(struct proc) - 1; j >= 0; j--) { | |
139 | p = &proc[j]; | |
140 | if (p->p_pid == pid) | |
141 | goto found; | |
142 | } | |
143 | } | |
144 | printf("Process not found.\n"); | |
145 | continue; | |
146 | found: | |
147 | if (p->p_uid != (uid = getuid()) && uid != 0) { | |
148 | printf("Not owner.\n"); | |
149 | continue; | |
150 | } | |
151 | if (p->p_stat == SZOMB) { | |
152 | printf("Zombie.\n"); | |
153 | continue; | |
154 | } | |
c4a87a78 MK |
155 | if (p->p_flag & SWEXIT) |
156 | printf("Warning: process exiting.\n"); | |
4f626618 KM |
157 | if (p->p_flag & SSYS) { |
158 | printf("System process.\n"); | |
159 | /* i.e. swapper or pagedaemon */ | |
160 | continue; | |
161 | } | |
162 | sprintf(coref, "core.%d", pid); | |
163 | if ((cor = creat(coref, 0666)) < 0) { | |
164 | perror(coref); | |
165 | exit(1); | |
166 | } | |
167 | core(p); | |
168 | close(cor); | |
169 | printf("%s dumped\n", coref); | |
170 | } | |
171 | } | |
172 | ||
173 | getw(loc) | |
174 | off_t loc; | |
175 | { | |
176 | int word; | |
177 | ||
178 | Get(kmem, loc, &word, sizeof(int)); | |
179 | return (word); | |
180 | } | |
181 | ||
182 | openfiles() | |
183 | { | |
184 | kmem = open(KMEM, 0); | |
185 | if (kmem < 0) { | |
186 | perror(KMEM); | |
187 | exit(1); | |
188 | } | |
189 | mem = open(MEM, 0); | |
190 | if (mem < 0) { | |
191 | perror(MEM); | |
192 | exit(1); | |
193 | } | |
194 | swap = open(SWAP, 0); | |
195 | if (swap < 0) { | |
196 | perror(SWAP); | |
197 | exit(1); | |
198 | } | |
199 | } | |
200 | ||
201 | getkvars() | |
202 | { | |
203 | nlist(NLIST, nl); | |
204 | if (nl[0].n_type == 0) { | |
205 | printf("%s: No namelist\n", NLIST); | |
206 | exit(1); | |
207 | } | |
208 | Usrptmap = (struct pte *) nl[X_USRPTMA].n_value; | |
209 | usrpt = (struct pte *) nl[X_USRPT].n_value; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Get the system page table entries (mapping the user page table). | |
214 | * These are the entries Usrptmap[i .. i + szpt], | |
215 | * where i = btokmx(p->p_p0br) and szpt = p->p_szpt. | |
216 | * For our purposes, we can skip over the ptes mapping | |
217 | * the text segment ptes. | |
218 | */ | |
219 | struct pte *syspt; /* pte's from Usrptmap */ | |
220 | int nsysptes; | |
221 | ||
222 | getsyspt(p) | |
223 | register struct proc *p; | |
224 | { | |
225 | nsysptes = p->p_szpt - (p->p_tsize / NPTEPG); | |
226 | syspt = (struct pte *) malloc(nsysptes * sizeof(struct pte)); | |
227 | if (syspt == NULL) | |
228 | panic("can't alloc %d page table entries", nsysptes); | |
229 | Get(kmem, &Usrptmap[btokmx(p->p_p0br) + (p->p_tsize / NPTEPG)], | |
230 | syspt, nsysptes * sizeof(struct pte)); | |
231 | } | |
232 | ||
233 | /* | |
234 | * Get the user page table for a segment. | |
235 | * seg 0 = p0 (not including text) | |
236 | * seg 1 = p1 (stack and u area) | |
237 | * The system pt is consulted to find each page of user ptes. | |
238 | */ | |
239 | struct pte * | |
240 | getpt(p, seg) | |
241 | register struct proc *p; | |
242 | int seg; | |
243 | { | |
244 | register int i; | |
245 | register struct pte *spt; | |
246 | struct pte *pt; | |
247 | int nptes, offset, n; | |
248 | ||
249 | if (seg == 0) { | |
250 | nptes = p->p_dsize; | |
251 | spt = syspt; | |
252 | offset = p->p_tsize % NPTEPG; | |
253 | } else { | |
254 | nptes = p->p_ssize + UPAGES; | |
255 | spt = syspt + (nsysptes - ctopt(nptes)); | |
256 | offset = -nptes % NPTEPG; | |
257 | if (offset < 0) | |
258 | offset += NPTEPG; | |
259 | } | |
260 | pt = (struct pte *) malloc(nptes * sizeof(struct pte)); | |
261 | if (pt == NULL) | |
262 | panic("can't alloc %d page table entries", nptes); | |
263 | for (i = 0; i < nptes; i += n) { | |
264 | n = min(NPTEPG - offset, nptes - i); | |
265 | Get(mem, ctob(spt->pg_pfnum) + offset * sizeof(struct pte), | |
266 | pt + i, n * sizeof(struct pte)); | |
267 | spt++; | |
268 | offset = 0; | |
269 | } | |
270 | return (pt); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Build the core file. | |
275 | */ | |
276 | core(p) | |
277 | register struct proc *p; | |
278 | { | |
279 | register struct pte *p0, *p1; | |
280 | ||
281 | if (p->p_flag & SLOAD) { /* page tables are resident */ | |
282 | getsyspt(p); | |
283 | p0 = getpt(p, 0); | |
284 | p1 = getpt(p, 1); | |
285 | #ifdef DEBUG | |
286 | showpt(syspt, nsysptes, "system"); | |
287 | showpt(p0, p->p_dsize, "p0"); | |
288 | showpt(p1, p->p_ssize + UPAGES, "p1"); | |
289 | #endif | |
290 | } | |
291 | getu(p, &p1[p->p_ssize]); /* u area */ | |
292 | getseg(p, p->p_dsize, p0, &u.u_dmap, 0); /* data */ | |
293 | getseg(p, p->p_ssize, p1, &u.u_smap, 1); /* stack */ | |
294 | if (p->p_flag & SLOAD) { | |
295 | free((char *) syspt); | |
296 | free((char *) p0); | |
297 | free((char *) p1); | |
298 | } | |
299 | } | |
300 | ||
301 | /* | |
302 | * Get the u area. | |
303 | * Keeps around the u structure for later use | |
304 | * (the data and stack disk map structures). | |
305 | */ | |
306 | getu(p, pages) | |
307 | register struct proc *p; | |
308 | register struct pte *pages; | |
309 | { | |
310 | register int i; | |
311 | ||
312 | if ((p->p_flag & SLOAD) == 0) { | |
313 | Get(swap, ctob(p->p_swaddr), uarea, ctob(UPAGES)); | |
314 | write(cor, uarea, ctob(UPAGES)); | |
315 | return; | |
316 | } | |
317 | for (i = 0; i < UPAGES; i += CLSIZE) { | |
318 | Get(mem, ctob(pages[i].pg_pfnum), uarea[i], ctob(CLSIZE)); | |
319 | write(cor, uarea[i], ctob(CLSIZE)); | |
320 | } | |
321 | } | |
322 | ||
323 | /* | |
324 | * Copy a segment to the core file. | |
325 | * The segment is described by its size in clicks, | |
326 | * its page table, its disk map, and whether or not | |
327 | * it grows backwards. | |
328 | * Note that the page table address is allowed to be meaningless | |
329 | * if the process is swapped out. | |
330 | */ | |
331 | getseg(p, segsize, pages, map, rev) | |
332 | register struct proc *p; | |
333 | int segsize; | |
334 | register struct pte *pages; | |
335 | struct dmap *map; | |
336 | { | |
337 | register int i; | |
338 | struct dblock db; | |
339 | int size; | |
340 | char buf[ctob(CLSIZE)]; | |
341 | ||
342 | for (i = 0; i < segsize; i += CLSIZE) { | |
343 | size = min(CLSIZE, segsize - i); | |
344 | if ((p->p_flag & SLOAD) == 0 || pages[i].pg_fod || | |
345 | pages[i].pg_pfnum == 0) { | |
346 | vstodb(i, size, map, &db, rev); | |
347 | Get(swap, ctob(db.db_base), buf, ctob(size)); | |
348 | write(cor, buf, ctob(size)); | |
349 | } else { | |
350 | Get(mem, ctob(pages[i].pg_pfnum), buf, ctob(size)); | |
351 | write(cor, buf, ctob(size)); | |
352 | } | |
353 | } | |
354 | } | |
355 | ||
356 | /* | |
357 | * Given a base/size pair in virtual swap area, | |
358 | * return a physical base/size pair which is the | |
359 | * (largest) initial, physically contiguous block. | |
360 | */ | |
361 | vstodb(vsbase, vssize, dmp, dbp, rev) | |
362 | register int vsbase; | |
363 | int vssize; | |
364 | struct dmap *dmp; | |
365 | register struct dblock *dbp; | |
366 | { | |
68d13ee3 | 367 | register int blk = dmmin; |
4f626618 KM |
368 | register swblk_t *ip = dmp->dm_map; |
369 | ||
370 | if (vsbase < 0 || vsbase + vssize > dmp->dm_size) | |
371 | panic("can't make sense out of virtual memory (gcore probably needs to be recompiled)"); | |
372 | while (vsbase >= blk) { | |
373 | vsbase -= blk; | |
68d13ee3 | 374 | if (blk < dmmax) |
4f626618 KM |
375 | blk *= 2; |
376 | ip++; | |
377 | } | |
378 | if (*ip <= 0 || *ip + blk > nswap) | |
379 | panic("vstodb *ip"); | |
380 | dbp->db_size = MIN(vssize, blk - vsbase); | |
381 | dbp->db_base = *ip + (rev ? blk - (vsbase + dbp->db_size) : vsbase); | |
382 | } | |
383 | ||
384 | /*VARARGS1*/ | |
385 | panic(cp, a, b, c, d) | |
386 | char *cp; | |
387 | { | |
388 | printf(cp, a, b, c, d); | |
389 | printf("\n"); | |
390 | longjmp(cont_frame, 1); | |
391 | } | |
392 | ||
393 | /* | |
394 | * Debugging routine to print out page table. | |
395 | */ | |
396 | #ifdef DEBUG | |
397 | showpt(pt, n, s) | |
398 | struct pte *pt; | |
399 | int n; | |
400 | char *s; | |
401 | { | |
402 | register struct pte *p; | |
403 | register int i; | |
404 | ||
405 | printf("*** %s page table\n", s); | |
406 | for (i = 0, p = pt; i < n; i++, p++) | |
407 | if (! p->pg_fod) | |
408 | printf("%d: %x\n", i, p->pg_pfnum); | |
409 | } | |
410 | #endif |