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Commit | Line | Data |
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da07e694 WL |
1 | /* |
2 | * FreeBSD sysctl() and sysarch() system call emulation | |
3 | * | |
4 | * Copyright (c) 2013-15 Stacey D. Son | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
48e438a3 | 20 | #include "qemu/osdep.h" |
da07e694 WL |
21 | #include "qemu.h" |
22 | #include "target_arch_sysarch.h" | |
23 | ||
08675078 WL |
24 | #include <sys/sysctl.h> |
25 | ||
26 | /* | |
27 | * Length for the fixed length types. | |
28 | * 0 means variable length for strings and structures | |
29 | * Compare with sys/kern_sysctl.c ctl_size | |
30 | * Note: Not all types appear to be used in-tree. | |
31 | */ | |
efba70de | 32 | static const int guest_ctl_size[CTLTYPE + 1] = { |
08675078 WL |
33 | [CTLTYPE_INT] = sizeof(abi_int), |
34 | [CTLTYPE_UINT] = sizeof(abi_uint), | |
35 | [CTLTYPE_LONG] = sizeof(abi_long), | |
36 | [CTLTYPE_ULONG] = sizeof(abi_ulong), | |
37 | [CTLTYPE_S8] = sizeof(int8_t), | |
38 | [CTLTYPE_S16] = sizeof(int16_t), | |
39 | [CTLTYPE_S32] = sizeof(int32_t), | |
40 | [CTLTYPE_S64] = sizeof(int64_t), | |
41 | [CTLTYPE_U8] = sizeof(uint8_t), | |
42 | [CTLTYPE_U16] = sizeof(uint16_t), | |
43 | [CTLTYPE_U32] = sizeof(uint32_t), | |
44 | [CTLTYPE_U64] = sizeof(uint64_t), | |
45 | }; | |
46 | ||
efba70de | 47 | static const int host_ctl_size[CTLTYPE + 1] = { |
08675078 WL |
48 | [CTLTYPE_INT] = sizeof(int), |
49 | [CTLTYPE_UINT] = sizeof(u_int), | |
50 | [CTLTYPE_LONG] = sizeof(long), | |
51 | [CTLTYPE_ULONG] = sizeof(u_long), | |
52 | [CTLTYPE_S8] = sizeof(int8_t), | |
53 | [CTLTYPE_S16] = sizeof(int16_t), | |
54 | [CTLTYPE_S32] = sizeof(int32_t), | |
55 | [CTLTYPE_S64] = sizeof(int64_t), | |
56 | [CTLTYPE_U8] = sizeof(uint8_t), | |
57 | [CTLTYPE_U16] = sizeof(uint16_t), | |
58 | [CTLTYPE_U32] = sizeof(uint32_t), | |
59 | [CTLTYPE_U64] = sizeof(uint64_t), | |
60 | }; | |
61 | ||
62 | #ifdef TARGET_ABI32 | |
63 | /* | |
64 | * Limit the amount of available memory to be most of the 32-bit address | |
65 | * space. 0x100c000 was arrived at through trial and error as a good | |
66 | * definition of 'most'. | |
67 | */ | |
68 | static const abi_ulong guest_max_mem = UINT32_MAX - 0x100c000 + 1; | |
69 | ||
248a485b | 70 | static abi_ulong cap_memory(uint64_t mem) |
08675078 WL |
71 | { |
72 | return MIN(guest_max_mem, mem); | |
73 | } | |
74 | #endif | |
75 | ||
248a485b | 76 | static abi_ulong scale_to_guest_pages(uint64_t pages) |
08675078 WL |
77 | { |
78 | /* Scale pages from host to guest */ | |
79 | pages = muldiv64(pages, qemu_real_host_page_size(), TARGET_PAGE_SIZE); | |
80 | #ifdef TARGET_ABI32 | |
81 | /* cap pages if need be */ | |
82 | pages = MIN(pages, guest_max_mem / (abi_ulong)TARGET_PAGE_SIZE); | |
83 | #endif | |
84 | return pages; | |
85 | } | |
86 | ||
87 | #ifdef TARGET_ABI32 | |
88 | /* Used only for TARGET_ABI32 */ | |
efba70de | 89 | static abi_long h2g_long_sat(long l) |
08675078 WL |
90 | { |
91 | if (l > INT32_MAX) { | |
92 | l = INT32_MAX; | |
93 | } else if (l < INT32_MIN) { | |
94 | l = INT32_MIN; | |
95 | } | |
96 | return l; | |
97 | } | |
98 | ||
efba70de | 99 | static abi_ulong h2g_ulong_sat(u_long ul) |
08675078 WL |
100 | { |
101 | return MIN(ul, UINT32_MAX); | |
102 | } | |
103 | #endif | |
104 | ||
105 | /* | |
106 | * placeholder until bsd-user downstream upstreams this with its thread support | |
107 | */ | |
108 | #define bsd_get_ncpu() 1 | |
109 | ||
efba70de SS |
110 | /* |
111 | * This uses the undocumented oidfmt interface to find the kind of a requested | |
112 | * sysctl, see /sys/kern/kern_sysctl.c:sysctl_sysctl_oidfmt() (compare to | |
113 | * src/sbin/sysctl/sysctl.c) | |
114 | */ | |
dd7a627a | 115 | static int oidfmt(int *oid, int len, char *fmt, uint32_t *kind) |
efba70de SS |
116 | { |
117 | int qoid[CTL_MAXNAME + 2]; | |
118 | uint8_t buf[BUFSIZ]; | |
119 | int i; | |
120 | size_t j; | |
121 | ||
122 | qoid[0] = CTL_SYSCTL; | |
123 | qoid[1] = CTL_SYSCTL_OIDFMT; | |
124 | memcpy(qoid + 2, oid, len * sizeof(int)); | |
125 | ||
126 | j = sizeof(buf); | |
127 | i = sysctl(qoid, len + 2, buf, &j, 0, 0); | |
128 | if (i) { | |
129 | return i; | |
130 | } | |
131 | ||
132 | if (kind) { | |
133 | *kind = *(uint32_t *)buf; | |
134 | } | |
135 | ||
136 | if (fmt) { | |
137 | strcpy(fmt, (char *)(buf + sizeof(uint32_t))); | |
138 | } | |
139 | return 0; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Convert the old value from host to guest. | |
144 | * | |
145 | * For LONG and ULONG on ABI32, we need to 'down convert' the 8 byte quantities | |
146 | * to 4 bytes. The caller setup a buffer in host memory to get this data from | |
147 | * the kernel and pass it to us. We do the down conversion and adjust the length | |
148 | * so the caller knows what to write as the returned length into the target when | |
149 | * it copies the down converted values into the target. | |
150 | * | |
151 | * For normal integral types, we just need to byte swap. No size changes. | |
152 | * | |
153 | * For strings and node data, there's no conversion needed. | |
154 | * | |
155 | * For opaque data, per sysctl OID converts take care of it. | |
156 | */ | |
dd7a627a | 157 | static void h2g_old_sysctl(void *holdp, size_t *holdlen, uint32_t kind) |
efba70de SS |
158 | { |
159 | size_t len; | |
160 | int hlen, glen; | |
161 | uint8_t *hp, *gp; | |
162 | ||
163 | /* | |
164 | * Although rare, we can have arrays of sysctl. Both sysctl_old_ddb in | |
165 | * kern_sysctl.c and show_var in sbin/sysctl/sysctl.c have code that loops | |
166 | * this way. *holdlen has been set by the kernel to the host's length. | |
167 | * Only LONG and ULONG on ABI32 have different sizes: see below. | |
168 | */ | |
169 | gp = hp = (uint8_t *)holdp; | |
170 | len = 0; | |
171 | hlen = host_ctl_size[kind & CTLTYPE]; | |
172 | glen = guest_ctl_size[kind & CTLTYPE]; | |
173 | ||
174 | /* | |
175 | * hlen == 0 for CTLTYPE_STRING and CTLTYPE_NODE, which need no conversion | |
176 | * as well as CTLTYPE_OPAQUE, which needs special converters. | |
177 | */ | |
178 | if (hlen == 0) { | |
179 | return; | |
180 | } | |
181 | ||
182 | while (len < *holdlen) { | |
183 | if (hlen == glen) { | |
184 | switch (hlen) { | |
185 | case 1: | |
186 | /* Nothing needed: no byteswapping and assigning in place */ | |
187 | break; | |
188 | case 2: | |
189 | *(uint16_t *)gp = tswap16(*(uint16_t *)hp); | |
190 | break; | |
191 | case 4: | |
192 | *(uint32_t *)gp = tswap32(*(uint32_t *)hp); | |
193 | break; | |
194 | case 8: | |
195 | *(uint64_t *)gp = tswap64(*(uint64_t *)hp); | |
196 | break; | |
197 | default: | |
198 | g_assert_not_reached(); | |
199 | } | |
200 | } else { | |
201 | #ifdef TARGET_ABI32 | |
202 | /* | |
203 | * Saturating assignment for the only two types that differ between | |
204 | * 32-bit and 64-bit machines. All other integral types have the | |
205 | * same, fixed size and will be converted w/o loss of precision | |
206 | * in the above switch. | |
207 | */ | |
208 | switch (kind & CTLTYPE) { | |
209 | case CTLTYPE_LONG: | |
210 | *(abi_long *)gp = tswap32(h2g_long_sat(*(long *)hp)); | |
211 | break; | |
212 | case CTLTYPE_ULONG: | |
213 | *(abi_ulong *)gp = tswap32(h2g_ulong_sat(*(u_long *)hp)); | |
214 | break; | |
215 | default: | |
216 | g_assert_not_reached(); | |
217 | } | |
218 | #else | |
219 | g_assert_not_reached(); | |
220 | #endif | |
221 | } | |
222 | gp += glen; | |
223 | hp += hlen; | |
224 | len += hlen; | |
225 | } | |
226 | #ifdef TARGET_ABI32 | |
227 | if (hlen != glen) { | |
228 | *holdlen = (*holdlen / hlen) * glen; | |
229 | } | |
230 | #endif | |
231 | } | |
232 | ||
0394968a JL |
233 | /* |
234 | * Convert the undocmented name2oid sysctl data for the target. | |
235 | */ | |
dd7a627a | 236 | static inline void sysctl_name2oid(uint32_t *holdp, size_t holdlen) |
0394968a JL |
237 | { |
238 | size_t i, num = holdlen / sizeof(uint32_t); | |
239 | ||
240 | for (i = 0; i < num; i++) { | |
241 | holdp[i] = tswap32(holdp[i]); | |
242 | } | |
243 | } | |
244 | ||
dd7a627a | 245 | static inline void sysctl_oidfmt(uint32_t *holdp) |
0394968a JL |
246 | { |
247 | /* byte swap the kind */ | |
248 | holdp[0] = tswap32(holdp[0]); | |
249 | } | |
250 | ||
7adda6de | 251 | static abi_long do_freebsd_sysctl_oid(CPUArchState *env, int32_t *snamep, |
dd7a627a JL |
252 | int32_t namelen, void *holdp, size_t *holdlenp, void *hnewp, |
253 | size_t newlen) | |
254 | { | |
255 | uint32_t kind = 0; | |
256 | abi_long ret; | |
257 | size_t holdlen, oldlen; | |
258 | #ifdef TARGET_ABI32 | |
259 | void *old_holdp; | |
260 | #endif | |
261 | ||
262 | holdlen = oldlen = *holdlenp; | |
263 | oidfmt(snamep, namelen, NULL, &kind); | |
264 | ||
265 | /* Handle some arch/emulator dependent sysctl()'s here. */ | |
248a485b JL |
266 | switch (snamep[0]) { |
267 | case CTL_KERN: | |
268 | switch (snamep[1]) { | |
269 | case KERN_USRSTACK: | |
270 | if (oldlen) { | |
271 | (*(abi_ulong *)holdp) = tswapal(TARGET_USRSTACK); | |
272 | } | |
273 | holdlen = sizeof(abi_ulong); | |
274 | ret = 0; | |
275 | goto out; | |
276 | ||
277 | case KERN_PS_STRINGS: | |
278 | if (oldlen) { | |
279 | (*(abi_ulong *)holdp) = tswapal(TARGET_PS_STRINGS); | |
280 | } | |
281 | holdlen = sizeof(abi_ulong); | |
282 | ret = 0; | |
283 | goto out; | |
284 | ||
285 | default: | |
286 | break; | |
287 | } | |
288 | break; | |
289 | ||
290 | case CTL_HW: | |
291 | switch (snamep[1]) { | |
292 | case HW_MACHINE: | |
293 | holdlen = sizeof(TARGET_HW_MACHINE); | |
294 | if (holdp) { | |
295 | strlcpy(holdp, TARGET_HW_MACHINE, oldlen); | |
296 | } | |
297 | ret = 0; | |
298 | goto out; | |
299 | ||
300 | case HW_MACHINE_ARCH: | |
301 | { | |
302 | holdlen = sizeof(TARGET_HW_MACHINE_ARCH); | |
303 | if (holdp) { | |
304 | strlcpy(holdp, TARGET_HW_MACHINE_ARCH, oldlen); | |
305 | } | |
306 | ret = 0; | |
307 | goto out; | |
308 | } | |
309 | case HW_NCPU: | |
310 | if (oldlen) { | |
311 | (*(abi_int *)holdp) = tswap32(bsd_get_ncpu()); | |
312 | } | |
313 | holdlen = sizeof(int32_t); | |
314 | ret = 0; | |
315 | goto out; | |
316 | #if defined(TARGET_ARM) | |
317 | case HW_FLOATINGPT: | |
318 | if (oldlen) { | |
319 | ARMCPU *cpu = env_archcpu(env); | |
320 | *(abi_int *)holdp = cpu_isar_feature(aa32_vfp, cpu); | |
321 | } | |
322 | holdlen = sizeof(abi_int); | |
323 | ret = 0; | |
324 | goto out; | |
325 | #endif | |
326 | ||
327 | ||
328 | #ifdef TARGET_ABI32 | |
329 | case HW_PHYSMEM: | |
330 | case HW_USERMEM: | |
331 | case HW_REALMEM: | |
332 | holdlen = sizeof(abi_ulong); | |
333 | ret = 0; | |
334 | ||
335 | if (oldlen) { | |
336 | int mib[2] = {snamep[0], snamep[1]}; | |
337 | unsigned long lvalue; | |
338 | size_t len = sizeof(lvalue); | |
339 | ||
340 | if (sysctl(mib, 2, &lvalue, &len, NULL, 0) == -1) { | |
341 | ret = -1; | |
342 | } else { | |
343 | lvalue = cap_memory(lvalue); | |
344 | (*(abi_ulong *)holdp) = tswapal((abi_ulong)lvalue); | |
345 | } | |
346 | } | |
347 | goto out; | |
348 | #endif | |
349 | ||
350 | default: | |
351 | { | |
352 | static int oid_hw_availpages; | |
353 | static int oid_hw_pagesizes; | |
354 | ||
355 | if (!oid_hw_availpages) { | |
356 | int real_oid[CTL_MAXNAME + 2]; | |
357 | size_t len = sizeof(real_oid) / sizeof(int); | |
358 | ||
359 | if (sysctlnametomib("hw.availpages", real_oid, &len) >= 0) { | |
360 | oid_hw_availpages = real_oid[1]; | |
361 | } | |
362 | } | |
363 | if (!oid_hw_pagesizes) { | |
364 | int real_oid[CTL_MAXNAME + 2]; | |
365 | size_t len = sizeof(real_oid) / sizeof(int); | |
366 | ||
367 | if (sysctlnametomib("hw.pagesizes", real_oid, &len) >= 0) { | |
368 | oid_hw_pagesizes = real_oid[1]; | |
369 | } | |
370 | } | |
371 | ||
372 | if (oid_hw_availpages && snamep[1] == oid_hw_availpages) { | |
373 | long lvalue; | |
374 | size_t len = sizeof(lvalue); | |
375 | ||
376 | if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1) { | |
377 | ret = -1; | |
378 | } else { | |
379 | if (oldlen) { | |
380 | lvalue = scale_to_guest_pages(lvalue); | |
381 | (*(abi_ulong *)holdp) = tswapal((abi_ulong)lvalue); | |
382 | } | |
383 | holdlen = sizeof(abi_ulong); | |
384 | ret = 0; | |
385 | } | |
386 | goto out; | |
387 | } | |
388 | ||
389 | if (oid_hw_pagesizes && snamep[1] == oid_hw_pagesizes) { | |
390 | if (oldlen) { | |
391 | (*(abi_ulong *)holdp) = tswapal((abi_ulong)TARGET_PAGE_SIZE); | |
392 | ((abi_ulong *)holdp)[1] = 0; | |
393 | } | |
394 | holdlen = sizeof(abi_ulong) * 2; | |
395 | ret = 0; | |
396 | goto out; | |
397 | } | |
398 | break; | |
399 | } | |
400 | } | |
401 | break; | |
402 | ||
403 | default: | |
404 | break; | |
405 | } | |
dd7a627a JL |
406 | |
407 | #ifdef TARGET_ABI32 | |
408 | /* | |
409 | * For long and ulong with a 64-bit host and a 32-bit target we have to do | |
410 | * special things. holdlen here is the length provided by the target to the | |
411 | * system call. So we allocate a buffer twice as large because longs are | |
412 | * twice as big on the host which will be writing them. In h2g_old_sysctl | |
413 | * we'll adjust them and adjust the length. | |
414 | */ | |
415 | if (kind == CTLTYPE_LONG || kind == CTLTYPE_ULONG) { | |
416 | old_holdp = holdp; | |
417 | holdlen = holdlen * 2; | |
418 | holdp = g_malloc(holdlen); | |
419 | } | |
420 | #endif | |
421 | ||
422 | ret = get_errno(sysctl(snamep, namelen, holdp, &holdlen, hnewp, newlen)); | |
423 | if (!ret && (holdp != 0)) { | |
424 | ||
425 | if (snamep[0] == CTL_SYSCTL) { | |
426 | switch (snamep[1]) { | |
427 | case CTL_SYSCTL_NEXT: | |
428 | case CTL_SYSCTL_NAME2OID: | |
429 | case CTL_SYSCTL_NEXTNOSKIP: | |
430 | /* | |
431 | * All of these return an OID array, so we need to convert to | |
432 | * target. | |
433 | */ | |
434 | sysctl_name2oid(holdp, holdlen); | |
435 | break; | |
436 | ||
437 | case CTL_SYSCTL_OIDFMT: | |
438 | /* Handle oidfmt */ | |
439 | sysctl_oidfmt(holdp); | |
440 | break; | |
441 | case CTL_SYSCTL_OIDDESCR: | |
442 | case CTL_SYSCTL_OIDLABEL: | |
443 | default: | |
444 | /* Handle it based on the type */ | |
445 | h2g_old_sysctl(holdp, &holdlen, kind); | |
446 | /* NB: None of these are LONG or ULONG */ | |
447 | break; | |
448 | } | |
449 | } else { | |
450 | /* | |
451 | * Need to convert from host to target. All the weird special cases | |
452 | * are handled above. | |
453 | */ | |
454 | h2g_old_sysctl(holdp, &holdlen, kind); | |
455 | #ifdef TARGET_ABI32 | |
456 | /* | |
457 | * For the 32-bit on 64-bit case, for longs we need to copy the | |
458 | * now-converted buffer to the target and free the buffer. | |
459 | */ | |
460 | if (kind == CTLTYPE_LONG || kind == CTLTYPE_ULONG) { | |
461 | memcpy(old_holdp, holdp, holdlen); | |
462 | g_free(holdp); | |
463 | holdp = old_holdp; | |
464 | } | |
465 | #endif | |
466 | } | |
467 | } | |
468 | ||
248a485b | 469 | out: |
dd7a627a JL |
470 | *holdlenp = holdlen; |
471 | return ret; | |
472 | } | |
473 | ||
6da777e2 KE |
474 | /* |
475 | * This syscall was created to make sysctlbyname(3) more efficient, but we can't | |
476 | * really provide it in bsd-user. Notably, we must always translate the names | |
477 | * independently since some sysctl values have to be faked for the target | |
478 | * environment, so it still has to break down to two syscalls for the underlying | |
479 | * implementation. | |
480 | */ | |
481 | abi_long do_freebsd_sysctlbyname(CPUArchState *env, abi_ulong namep, | |
482 | int32_t namelen, abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp, | |
483 | abi_ulong newlen) | |
484 | { | |
485 | abi_long ret = -TARGET_EFAULT; | |
486 | void *holdp = NULL, *hnewp = NULL; | |
487 | char *snamep = NULL; | |
488 | int oid[CTL_MAXNAME + 2]; | |
489 | size_t holdlen, oidplen; | |
490 | abi_ulong oldlen = 0; | |
491 | ||
492 | /* oldlenp is read/write, pre-check here for write */ | |
493 | if (oldlenp) { | |
494 | if (!access_ok(VERIFY_WRITE, oldlenp, sizeof(abi_ulong)) || | |
495 | get_user_ual(oldlen, oldlenp)) { | |
496 | goto out; | |
497 | } | |
498 | } | |
499 | snamep = lock_user_string(namep); | |
500 | if (snamep == NULL) { | |
501 | goto out; | |
502 | } | |
503 | if (newp) { | |
504 | hnewp = lock_user(VERIFY_READ, newp, newlen, 1); | |
505 | if (hnewp == NULL) { | |
506 | goto out; | |
507 | } | |
508 | } | |
509 | if (oldp) { | |
510 | holdp = lock_user(VERIFY_WRITE, oldp, oldlen, 0); | |
511 | if (holdp == NULL) { | |
512 | goto out; | |
513 | } | |
514 | } | |
515 | holdlen = oldlen; | |
516 | ||
517 | oidplen = ARRAY_SIZE(oid); | |
518 | if (sysctlnametomib(snamep, oid, &oidplen) != 0) { | |
519 | ret = -TARGET_EINVAL; | |
520 | goto out; | |
521 | } | |
522 | ||
523 | ret = do_freebsd_sysctl_oid(env, oid, oidplen, holdp, &holdlen, hnewp, | |
524 | newlen); | |
525 | ||
526 | /* | |
527 | * writeability pre-checked above. __sysctl(2) returns ENOMEM and updates | |
528 | * oldlenp for the proper size to use. | |
529 | */ | |
530 | if (oldlenp && (ret == 0 || ret == -TARGET_ENOMEM)) { | |
531 | put_user_ual(holdlen, oldlenp); | |
532 | } | |
533 | out: | |
534 | unlock_user(snamep, namep, 0); | |
535 | unlock_user(holdp, oldp, ret == 0 ? holdlen : 0); | |
536 | unlock_user(hnewp, newp, 0); | |
537 | ||
538 | return ret; | |
539 | } | |
540 | ||
7adda6de KE |
541 | abi_long do_freebsd_sysctl(CPUArchState *env, abi_ulong namep, int32_t namelen, |
542 | abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp, abi_ulong newlen) | |
543 | { | |
544 | abi_long ret = -TARGET_EFAULT; | |
545 | void *hnamep, *holdp = NULL, *hnewp = NULL; | |
546 | size_t holdlen; | |
547 | abi_ulong oldlen = 0; | |
548 | int32_t *snamep = g_malloc(sizeof(int32_t) * namelen), *p, *q, i; | |
549 | ||
550 | /* oldlenp is read/write, pre-check here for write */ | |
551 | if (oldlenp) { | |
552 | if (!access_ok(VERIFY_WRITE, oldlenp, sizeof(abi_ulong)) || | |
553 | get_user_ual(oldlen, oldlenp)) { | |
554 | goto out; | |
555 | } | |
556 | } | |
557 | hnamep = lock_user(VERIFY_READ, namep, namelen, 1); | |
558 | if (hnamep == NULL) { | |
559 | goto out; | |
560 | } | |
561 | if (newp) { | |
562 | hnewp = lock_user(VERIFY_READ, newp, newlen, 1); | |
563 | if (hnewp == NULL) { | |
564 | goto out; | |
565 | } | |
566 | } | |
567 | if (oldp) { | |
568 | holdp = lock_user(VERIFY_WRITE, oldp, oldlen, 0); | |
569 | if (holdp == NULL) { | |
570 | goto out; | |
571 | } | |
572 | } | |
573 | holdlen = oldlen; | |
574 | for (p = hnamep, q = snamep, i = 0; i < namelen; p++, i++, q++) { | |
575 | *q = tswap32(*p); | |
576 | } | |
577 | ||
578 | ret = do_freebsd_sysctl_oid(env, snamep, namelen, holdp, &holdlen, hnewp, | |
579 | newlen); | |
580 | ||
581 | /* | |
582 | * writeability pre-checked above. __sysctl(2) returns ENOMEM and updates | |
583 | * oldlenp for the proper size to use. | |
584 | */ | |
585 | if (oldlenp && (ret == 0 || ret == -TARGET_ENOMEM)) { | |
586 | put_user_ual(holdlen, oldlenp); | |
587 | } | |
588 | unlock_user(hnamep, namep, 0); | |
589 | unlock_user(holdp, oldp, ret == 0 ? holdlen : 0); | |
590 | out: | |
591 | g_free(snamep); | |
592 | return ret; | |
593 | } | |
594 | ||
da07e694 WL |
595 | /* sysarch() is architecture dependent. */ |
596 | abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2) | |
597 | { | |
598 | return do_freebsd_arch_sysarch(cpu_env, arg1, arg2); | |
599 | } |