Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Signal support for 32-bit kernel builds |
2 | * | |
3 | * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> | |
d104f11c KM |
4 | * Copyright (C) 2006 Kyle McMartin <kyle at parisc-linux.org> |
5 | * | |
1da177e4 LT |
6 | * Code was mostly borrowed from kernel/signal.c. |
7 | * See kernel/signal.c for additional Copyrights. | |
8 | * | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/compat.h> | |
1da177e4 LT |
26 | #include <linux/module.h> |
27 | #include <linux/unistd.h> | |
1da177e4 LT |
28 | #include <linux/init.h> |
29 | #include <linux/sched.h> | |
30 | #include <linux/syscalls.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/errno.h> | |
33 | ||
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | ||
36 | #include "signal32.h" | |
1da177e4 LT |
37 | |
38 | #define DEBUG_COMPAT_SIG 0 | |
39 | #define DEBUG_COMPAT_SIG_LEVEL 2 | |
40 | ||
41 | #if DEBUG_COMPAT_SIG | |
42 | #define DBG(LEVEL, ...) \ | |
43 | ((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \ | |
44 | ? printk(__VA_ARGS__) : (void) 0) | |
45 | #else | |
46 | #define DBG(LEVEL, ...) | |
47 | #endif | |
48 | ||
1da177e4 LT |
49 | inline void |
50 | sigset_32to64(sigset_t *s64, compat_sigset_t *s32) | |
51 | { | |
52 | s64->sig[0] = s32->sig[0] | ((unsigned long)s32->sig[1] << 32); | |
53 | } | |
54 | ||
55 | inline void | |
56 | sigset_64to32(compat_sigset_t *s32, sigset_t *s64) | |
57 | { | |
58 | s32->sig[0] = s64->sig[0] & 0xffffffffUL; | |
59 | s32->sig[1] = (s64->sig[0] >> 32) & 0xffffffffUL; | |
60 | } | |
61 | ||
1da177e4 LT |
62 | long |
63 | restore_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf, | |
64 | struct pt_regs *regs) | |
65 | { | |
66 | long err = 0; | |
67 | compat_uint_t compat_reg; | |
68 | compat_uint_t compat_regt; | |
69 | int regn; | |
70 | ||
71 | /* When loading 32-bit values into 64-bit registers make | |
72 | sure to clear the upper 32-bits */ | |
73 | DBG(2,"restore_sigcontext32: PER_LINUX32 process\n"); | |
74 | DBG(2,"restore_sigcontext32: sc = 0x%p, rf = 0x%p, regs = 0x%p\n", sc, rf, regs); | |
75 | DBG(2,"restore_sigcontext32: compat_sigcontext is %#lx bytes\n", sizeof(*sc)); | |
76 | for(regn=0; regn < 32; regn++){ | |
77 | err |= __get_user(compat_reg,&sc->sc_gr[regn]); | |
78 | regs->gr[regn] = compat_reg; | |
79 | /* Load upper half */ | |
80 | err |= __get_user(compat_regt,&rf->rf_gr[regn]); | |
81 | regs->gr[regn] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
82 | DBG(3,"restore_sigcontext32: gr%02d = %#lx (%#x / %#x)\n", | |
83 | regn, regs->gr[regn], compat_regt, compat_reg); | |
84 | } | |
85 | DBG(2,"restore_sigcontext32: sc->sc_fr = 0x%p (%#lx)\n",sc->sc_fr, sizeof(sc->sc_fr)); | |
86 | /* XXX: BE WARNED FR's are 64-BIT! */ | |
87 | err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); | |
88 | ||
89 | /* Better safe than sorry, pass __get_user two things of | |
90 | the same size and let gcc do the upward conversion to | |
91 | 64-bits */ | |
92 | err |= __get_user(compat_reg, &sc->sc_iaoq[0]); | |
93 | /* Load upper half */ | |
94 | err |= __get_user(compat_regt, &rf->rf_iaoq[0]); | |
95 | regs->iaoq[0] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
96 | DBG(2,"restore_sigcontext32: upper half of iaoq[0] = %#lx\n", compat_regt); | |
97 | DBG(2,"restore_sigcontext32: sc->sc_iaoq[0] = %p => %#x\n", | |
98 | &sc->sc_iaoq[0], compat_reg); | |
99 | ||
100 | err |= __get_user(compat_reg, &sc->sc_iaoq[1]); | |
101 | /* Load upper half */ | |
102 | err |= __get_user(compat_regt, &rf->rf_iaoq[1]); | |
103 | regs->iaoq[1] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
104 | DBG(2,"restore_sigcontext32: upper half of iaoq[1] = %#lx\n", compat_regt); | |
105 | DBG(2,"restore_sigcontext32: sc->sc_iaoq[1] = %p => %#x\n", | |
106 | &sc->sc_iaoq[1],compat_reg); | |
107 | DBG(2,"restore_sigcontext32: iaoq is %#lx / %#lx\n", | |
108 | regs->iaoq[0],regs->iaoq[1]); | |
109 | ||
110 | err |= __get_user(compat_reg, &sc->sc_iasq[0]); | |
111 | /* Load the upper half for iasq */ | |
112 | err |= __get_user(compat_regt, &rf->rf_iasq[0]); | |
113 | regs->iasq[0] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
114 | DBG(2,"restore_sigcontext32: upper half of iasq[0] = %#lx\n", compat_regt); | |
115 | ||
116 | err |= __get_user(compat_reg, &sc->sc_iasq[1]); | |
117 | /* Load the upper half for iasq */ | |
118 | err |= __get_user(compat_regt, &rf->rf_iasq[1]); | |
119 | regs->iasq[1] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
120 | DBG(2,"restore_sigcontext32: upper half of iasq[1] = %#lx\n", compat_regt); | |
121 | DBG(2,"restore_sigcontext32: iasq is %#lx / %#lx\n", | |
122 | regs->iasq[0],regs->iasq[1]); | |
123 | ||
124 | err |= __get_user(compat_reg, &sc->sc_sar); | |
125 | /* Load the upper half for sar */ | |
126 | err |= __get_user(compat_regt, &rf->rf_sar); | |
127 | regs->sar = ((u64)compat_regt << 32) | (u64)compat_reg; | |
128 | DBG(2,"restore_sigcontext32: upper_half & sar = %#lx\n", compat_regt); | |
129 | DBG(2,"restore_sigcontext32: sar is %#lx\n", regs->sar); | |
130 | DBG(2,"restore_sigcontext32: r28 is %ld\n", regs->gr[28]); | |
131 | ||
132 | return err; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Set up the sigcontext structure for this process. | |
137 | * This is not an easy task if the kernel is 64-bit, it will require | |
138 | * that we examine the process personality to determine if we need to | |
139 | * truncate for a 32-bit userspace. | |
140 | */ | |
141 | long | |
142 | setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf, | |
143 | struct pt_regs *regs, int in_syscall) | |
144 | { | |
145 | compat_int_t flags = 0; | |
146 | long err = 0; | |
147 | compat_uint_t compat_reg; | |
148 | compat_uint_t compat_regb; | |
149 | int regn; | |
150 | ||
151 | if (on_sig_stack((unsigned long) sc)) | |
152 | flags |= PARISC_SC_FLAG_ONSTACK; | |
153 | ||
154 | if (in_syscall) { | |
155 | ||
156 | DBG(1,"setup_sigcontext32: in_syscall\n"); | |
157 | ||
158 | flags |= PARISC_SC_FLAG_IN_SYSCALL; | |
159 | /* Truncate gr31 */ | |
160 | compat_reg = (compat_uint_t)(regs->gr[31]); | |
161 | /* regs->iaoq is undefined in the syscall return path */ | |
162 | err |= __put_user(compat_reg, &sc->sc_iaoq[0]); | |
163 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n", | |
164 | &sc->sc_iaoq[0], compat_reg); | |
165 | ||
166 | /* Store upper half */ | |
f4441b62 | 167 | compat_reg = (compat_uint_t)(regs->gr[31] >> 32); |
1da177e4 LT |
168 | err |= __put_user(compat_reg, &rf->rf_iaoq[0]); |
169 | DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg); | |
170 | ||
171 | ||
172 | compat_reg = (compat_uint_t)(regs->gr[31]+4); | |
173 | err |= __put_user(compat_reg, &sc->sc_iaoq[1]); | |
174 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n", | |
175 | &sc->sc_iaoq[1], compat_reg); | |
176 | /* Store upper half */ | |
f4441b62 | 177 | compat_reg = (compat_uint_t)((regs->gr[31]+4) >> 32); |
1da177e4 LT |
178 | err |= __put_user(compat_reg, &rf->rf_iaoq[1]); |
179 | DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg); | |
180 | ||
181 | /* Truncate sr3 */ | |
182 | compat_reg = (compat_uint_t)(regs->sr[3]); | |
183 | err |= __put_user(compat_reg, &sc->sc_iasq[0]); | |
184 | err |= __put_user(compat_reg, &sc->sc_iasq[1]); | |
185 | ||
186 | /* Store upper half */ | |
187 | compat_reg = (compat_uint_t)(regs->sr[3] >> 32); | |
188 | err |= __put_user(compat_reg, &rf->rf_iasq[0]); | |
189 | err |= __put_user(compat_reg, &rf->rf_iasq[1]); | |
190 | ||
191 | DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg); | |
192 | DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg); | |
193 | DBG(1,"setup_sigcontext32: iaoq %#lx / %#lx\n", | |
194 | regs->gr[31], regs->gr[31]+4); | |
195 | ||
196 | } else { | |
197 | ||
198 | compat_reg = (compat_uint_t)(regs->iaoq[0]); | |
199 | err |= __put_user(compat_reg, &sc->sc_iaoq[0]); | |
200 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n", | |
201 | &sc->sc_iaoq[0], compat_reg); | |
202 | /* Store upper half */ | |
203 | compat_reg = (compat_uint_t)(regs->iaoq[0] >> 32); | |
204 | err |= __put_user(compat_reg, &rf->rf_iaoq[0]); | |
205 | DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg); | |
206 | ||
207 | compat_reg = (compat_uint_t)(regs->iaoq[1]); | |
208 | err |= __put_user(compat_reg, &sc->sc_iaoq[1]); | |
209 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n", | |
210 | &sc->sc_iaoq[1], compat_reg); | |
211 | /* Store upper half */ | |
212 | compat_reg = (compat_uint_t)(regs->iaoq[1] >> 32); | |
213 | err |= __put_user(compat_reg, &rf->rf_iaoq[1]); | |
214 | DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg); | |
215 | ||
216 | ||
217 | compat_reg = (compat_uint_t)(regs->iasq[0]); | |
218 | err |= __put_user(compat_reg, &sc->sc_iasq[0]); | |
219 | DBG(2,"setup_sigcontext32: sc->sc_iasq[0] = %p <= %#x\n", | |
220 | &sc->sc_iasq[0], compat_reg); | |
221 | /* Store upper half */ | |
222 | compat_reg = (compat_uint_t)(regs->iasq[0] >> 32); | |
223 | err |= __put_user(compat_reg, &rf->rf_iasq[0]); | |
224 | DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg); | |
225 | ||
226 | ||
227 | compat_reg = (compat_uint_t)(regs->iasq[1]); | |
228 | err |= __put_user(compat_reg, &sc->sc_iasq[1]); | |
229 | DBG(2,"setup_sigcontext32: sc->sc_iasq[1] = %p <= %#x\n", | |
230 | &sc->sc_iasq[1], compat_reg); | |
231 | /* Store upper half */ | |
232 | compat_reg = (compat_uint_t)(regs->iasq[1] >> 32); | |
233 | err |= __put_user(compat_reg, &rf->rf_iasq[1]); | |
234 | DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg); | |
235 | ||
236 | /* Print out the IAOQ for debugging */ | |
237 | DBG(1,"setup_sigcontext32: ia0q %#lx / %#lx\n", | |
238 | regs->iaoq[0], regs->iaoq[1]); | |
239 | } | |
240 | ||
241 | err |= __put_user(flags, &sc->sc_flags); | |
242 | ||
243 | DBG(1,"setup_sigcontext32: Truncating general registers.\n"); | |
244 | ||
245 | for(regn=0; regn < 32; regn++){ | |
246 | /* Truncate a general register */ | |
247 | compat_reg = (compat_uint_t)(regs->gr[regn]); | |
248 | err |= __put_user(compat_reg, &sc->sc_gr[regn]); | |
249 | /* Store upper half */ | |
250 | compat_regb = (compat_uint_t)(regs->gr[regn] >> 32); | |
251 | err |= __put_user(compat_regb, &rf->rf_gr[regn]); | |
252 | ||
253 | /* DEBUG: Write out the "upper / lower" register data */ | |
254 | DBG(2,"setup_sigcontext32: gr%02d = %#x / %#x\n", regn, | |
255 | compat_regb, compat_reg); | |
256 | } | |
257 | ||
258 | /* Copy the floating point registers (same size) | |
259 | XXX: BE WARNED FR's are 64-BIT! */ | |
260 | DBG(1,"setup_sigcontext32: Copying from regs to sc, " | |
261 | "sc->sc_fr size = %#lx, regs->fr size = %#lx\n", | |
262 | sizeof(regs->fr), sizeof(sc->sc_fr)); | |
263 | err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); | |
264 | ||
265 | compat_reg = (compat_uint_t)(regs->sar); | |
266 | err |= __put_user(compat_reg, &sc->sc_sar); | |
267 | DBG(2,"setup_sigcontext32: sar is %#x\n", compat_reg); | |
268 | /* Store upper half */ | |
269 | compat_reg = (compat_uint_t)(regs->sar >> 32); | |
270 | err |= __put_user(compat_reg, &rf->rf_sar); | |
271 | DBG(2,"setup_sigcontext32: upper half sar = %#x\n", compat_reg); | |
272 | DBG(1,"setup_sigcontext32: r28 is %ld\n", regs->gr[28]); | |
273 | ||
274 | return err; | |
275 | } | |
f671c45d KM |
276 | |
277 | int | |
278 | copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from) | |
279 | { | |
f6744bdd | 280 | compat_uptr_t addr; |
f671c45d KM |
281 | int err; |
282 | ||
283 | if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t))) | |
284 | return -EFAULT; | |
285 | ||
286 | err = __get_user(to->si_signo, &from->si_signo); | |
287 | err |= __get_user(to->si_errno, &from->si_errno); | |
288 | err |= __get_user(to->si_code, &from->si_code); | |
289 | ||
290 | if (to->si_code < 0) | |
291 | err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
292 | else { | |
293 | switch (to->si_code >> 16) { | |
294 | case __SI_CHLD >> 16: | |
295 | err |= __get_user(to->si_utime, &from->si_utime); | |
296 | err |= __get_user(to->si_stime, &from->si_stime); | |
297 | err |= __get_user(to->si_status, &from->si_status); | |
298 | default: | |
299 | err |= __get_user(to->si_pid, &from->si_pid); | |
300 | err |= __get_user(to->si_uid, &from->si_uid); | |
301 | break; | |
302 | case __SI_FAULT >> 16: | |
f6744bdd CDJ |
303 | err |= __get_user(addr, &from->si_addr); |
304 | to->si_addr = compat_ptr(addr); | |
f671c45d KM |
305 | break; |
306 | case __SI_POLL >> 16: | |
307 | err |= __get_user(to->si_band, &from->si_band); | |
308 | err |= __get_user(to->si_fd, &from->si_fd); | |
309 | break; | |
310 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
311 | case __SI_MESGQ >> 16: | |
312 | err |= __get_user(to->si_pid, &from->si_pid); | |
313 | err |= __get_user(to->si_uid, &from->si_uid); | |
314 | err |= __get_user(to->si_int, &from->si_int); | |
315 | break; | |
316 | } | |
317 | } | |
318 | return err; | |
319 | } | |
320 | ||
321 | int | |
322 | copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from) | |
323 | { | |
f6744bdd CDJ |
324 | compat_uptr_t addr; |
325 | compat_int_t val; | |
f671c45d KM |
326 | int err; |
327 | ||
328 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
329 | return -EFAULT; | |
330 | ||
331 | /* If you change siginfo_t structure, please be sure | |
332 | this code is fixed accordingly. | |
333 | It should never copy any pad contained in the structure | |
334 | to avoid security leaks, but must copy the generic | |
335 | 3 ints plus the relevant union member. | |
336 | This routine must convert siginfo from 64bit to 32bit as well | |
337 | at the same time. */ | |
338 | err = __put_user(from->si_signo, &to->si_signo); | |
339 | err |= __put_user(from->si_errno, &to->si_errno); | |
340 | err |= __put_user((short)from->si_code, &to->si_code); | |
341 | if (from->si_code < 0) | |
342 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
343 | else { | |
344 | switch (from->si_code >> 16) { | |
345 | case __SI_CHLD >> 16: | |
346 | err |= __put_user(from->si_utime, &to->si_utime); | |
347 | err |= __put_user(from->si_stime, &to->si_stime); | |
348 | err |= __put_user(from->si_status, &to->si_status); | |
349 | default: | |
350 | err |= __put_user(from->si_pid, &to->si_pid); | |
351 | err |= __put_user(from->si_uid, &to->si_uid); | |
352 | break; | |
353 | case __SI_FAULT >> 16: | |
f6744bdd CDJ |
354 | addr = ptr_to_compat(from->si_addr); |
355 | err |= __put_user(addr, &to->si_addr); | |
f671c45d KM |
356 | break; |
357 | case __SI_POLL >> 16: | |
358 | err |= __put_user(from->si_band, &to->si_band); | |
359 | err |= __put_user(from->si_fd, &to->si_fd); | |
360 | break; | |
361 | case __SI_TIMER >> 16: | |
362 | err |= __put_user(from->si_tid, &to->si_tid); | |
363 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
f6744bdd CDJ |
364 | val = (compat_int_t)from->si_int; |
365 | err |= __put_user(val, &to->si_int); | |
f671c45d KM |
366 | break; |
367 | case __SI_RT >> 16: /* Not generated by the kernel as of now. */ | |
368 | case __SI_MESGQ >> 16: | |
369 | err |= __put_user(from->si_uid, &to->si_uid); | |
370 | err |= __put_user(from->si_pid, &to->si_pid); | |
f6744bdd CDJ |
371 | val = (compat_int_t)from->si_int; |
372 | err |= __put_user(val, &to->si_int); | |
f671c45d KM |
373 | break; |
374 | } | |
375 | } | |
376 | return err; | |
377 | } |