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Commit | Line | Data |
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1da177e4 | 1 | /* |
81e7009e | 2 | * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC |
1da177e4 | 3 | * |
81e7009e SR |
4 | * PowerPC version |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
1da177e4 LT |
6 | * Copyright (C) 2001 IBM |
7 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
8 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) | |
9 | * | |
81e7009e SR |
10 | * Derived from "arch/i386/kernel/signal.c" |
11 | * Copyright (C) 1991, 1992 Linus Torvalds | |
12 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
1da177e4 | 13 | * |
81e7009e SR |
14 | * This program is free software; you can redistribute it and/or |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/sched.h> |
81e7009e | 21 | #include <linux/mm.h> |
1da177e4 | 22 | #include <linux/smp.h> |
1da177e4 LT |
23 | #include <linux/kernel.h> |
24 | #include <linux/signal.h> | |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/elf.h> | |
05ead015 | 27 | #include <linux/ptrace.h> |
76462232 | 28 | #include <linux/ratelimit.h> |
81e7009e SR |
29 | #ifdef CONFIG_PPC64 |
30 | #include <linux/syscalls.h> | |
1da177e4 | 31 | #include <linux/compat.h> |
81e7009e SR |
32 | #else |
33 | #include <linux/wait.h> | |
81e7009e SR |
34 | #include <linux/unistd.h> |
35 | #include <linux/stddef.h> | |
36 | #include <linux/tty.h> | |
37 | #include <linux/binfmts.h> | |
81e7009e SR |
38 | #endif |
39 | ||
7c0f6ba6 | 40 | #include <linux/uaccess.h> |
81e7009e | 41 | #include <asm/cacheflush.h> |
a7f31841 | 42 | #include <asm/syscalls.h> |
c5ff7001 | 43 | #include <asm/sigcontext.h> |
a7f290da | 44 | #include <asm/vdso.h> |
ae3a197e | 45 | #include <asm/switch_to.h> |
2b0a576d | 46 | #include <asm/tm.h> |
0545d543 | 47 | #include <asm/asm-prototypes.h> |
81e7009e | 48 | #ifdef CONFIG_PPC64 |
879168ee | 49 | #include "ppc32.h" |
1da177e4 | 50 | #include <asm/unistd.h> |
81e7009e SR |
51 | #else |
52 | #include <asm/ucontext.h> | |
53 | #include <asm/pgtable.h> | |
54 | #endif | |
1da177e4 | 55 | |
22e38f29 BH |
56 | #include "signal.h" |
57 | ||
1da177e4 | 58 | |
81e7009e | 59 | #ifdef CONFIG_PPC64 |
b09a4913 | 60 | #define sys_rt_sigreturn compat_sys_rt_sigreturn |
b09a4913 SR |
61 | #define sys_swapcontext compat_sys_swapcontext |
62 | #define sys_sigreturn compat_sys_sigreturn | |
81e7009e SR |
63 | |
64 | #define old_sigaction old_sigaction32 | |
65 | #define sigcontext sigcontext32 | |
66 | #define mcontext mcontext32 | |
67 | #define ucontext ucontext32 | |
68 | ||
7cce2465 AV |
69 | #define __save_altstack __compat_save_altstack |
70 | ||
c1cb299e MN |
71 | /* |
72 | * Userspace code may pass a ucontext which doesn't include VSX added | |
73 | * at the end. We need to check for this case. | |
74 | */ | |
75 | #define UCONTEXTSIZEWITHOUTVSX \ | |
76 | (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32)) | |
77 | ||
81e7009e SR |
78 | /* |
79 | * Returning 0 means we return to userspace via | |
80 | * ret_from_except and thus restore all user | |
81 | * registers from *regs. This is what we need | |
82 | * to do when a signal has been delivered. | |
83 | */ | |
81e7009e SR |
84 | |
85 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
86 | #undef __SIGNAL_FRAMESIZE | |
87 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
88 | #undef ELF_NVRREG | |
89 | #define ELF_NVRREG ELF_NVRREG32 | |
90 | ||
91 | /* | |
92 | * Functions for flipping sigsets (thanks to brain dead generic | |
93 | * implementation that makes things simple for little endian only) | |
94 | */ | |
95 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
96 | { | |
97 | compat_sigset_t cset; | |
98 | ||
99 | switch (_NSIG_WORDS) { | |
a313f4c5 | 100 | case 4: cset.sig[6] = set->sig[3] & 0xffffffffull; |
81e7009e SR |
101 | cset.sig[7] = set->sig[3] >> 32; |
102 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
103 | cset.sig[5] = set->sig[2] >> 32; | |
104 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
105 | cset.sig[3] = set->sig[1] >> 32; | |
106 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
107 | cset.sig[1] = set->sig[0] >> 32; | |
108 | } | |
109 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
110 | } | |
111 | ||
9b7cf8b4 PM |
112 | static inline int get_sigset_t(sigset_t *set, |
113 | const compat_sigset_t __user *uset) | |
81e7009e SR |
114 | { |
115 | compat_sigset_t s32; | |
116 | ||
117 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
118 | return -EFAULT; | |
119 | ||
120 | /* | |
121 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
122 | * in the "wrong" endian in 32-bit user storage). | |
123 | */ | |
124 | switch (_NSIG_WORDS) { | |
125 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
126 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
127 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
128 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
129 | } | |
130 | return 0; | |
131 | } | |
132 | ||
29e646df | 133 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
134 | #define from_user_ptr(p) compat_ptr(p) |
135 | ||
136 | static inline int save_general_regs(struct pt_regs *regs, | |
137 | struct mcontext __user *frame) | |
138 | { | |
139 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
140 | int i; | |
141 | ||
1bd79336 | 142 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
143 | |
144 | for (i = 0; i <= PT_RESULT; i ++) { | |
145 | if (i == 14 && !FULL_REGS(regs)) | |
146 | i = 32; | |
81e7009e SR |
147 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
148 | return -EFAULT; | |
401d1f02 | 149 | } |
81e7009e SR |
150 | return 0; |
151 | } | |
152 | ||
153 | static inline int restore_general_regs(struct pt_regs *regs, | |
154 | struct mcontext __user *sr) | |
155 | { | |
156 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
157 | int i; | |
158 | ||
159 | for (i = 0; i <= PT_RESULT; i++) { | |
160 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
161 | continue; | |
162 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
163 | return -EFAULT; | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
168 | #else /* CONFIG_PPC64 */ | |
169 | ||
81e7009e SR |
170 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
171 | ||
172 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
173 | { | |
174 | return copy_to_user(uset, set, sizeof(*uset)); | |
175 | } | |
176 | ||
9b7cf8b4 | 177 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
178 | { |
179 | return copy_from_user(set, uset, sizeof(*uset)); | |
180 | } | |
181 | ||
29e646df AV |
182 | #define to_user_ptr(p) ((unsigned long)(p)) |
183 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
184 | |
185 | static inline int save_general_regs(struct pt_regs *regs, | |
186 | struct mcontext __user *frame) | |
187 | { | |
1bd79336 | 188 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
189 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
190 | } | |
191 | ||
192 | static inline int restore_general_regs(struct pt_regs *regs, | |
193 | struct mcontext __user *sr) | |
194 | { | |
195 | /* copy up to but not including MSR */ | |
196 | if (__copy_from_user(regs, &sr->mc_gregs, | |
197 | PT_MSR * sizeof(elf_greg_t))) | |
198 | return -EFAULT; | |
199 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
200 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
201 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
202 | return -EFAULT; | |
203 | return 0; | |
204 | } | |
81e7009e SR |
205 | #endif |
206 | ||
1da177e4 LT |
207 | /* |
208 | * When we have signals to deliver, we set up on the | |
209 | * user stack, going down from the original stack pointer: | |
a3f61dc0 BH |
210 | * an ABI gap of 56 words |
211 | * an mcontext struct | |
81e7009e SR |
212 | * a sigcontext struct |
213 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 | 214 | * |
a3f61dc0 BH |
215 | * Each of these things must be a multiple of 16 bytes in size. The following |
216 | * structure represent all of this except the __SIGNAL_FRAMESIZE gap | |
1da177e4 LT |
217 | * |
218 | */ | |
a3f61dc0 BH |
219 | struct sigframe { |
220 | struct sigcontext sctx; /* the sigcontext */ | |
81e7009e | 221 | struct mcontext mctx; /* all the register values */ |
2b0a576d MN |
222 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
223 | struct sigcontext sctx_transact; | |
224 | struct mcontext mctx_transact; | |
225 | #endif | |
1da177e4 LT |
226 | /* |
227 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
228 | * regs and 18 fp regs below sp before decrementing it. | |
229 | */ | |
230 | int abigap[56]; | |
231 | }; | |
232 | ||
233 | /* We use the mc_pad field for the signal return trampoline. */ | |
234 | #define tramp mc_pad | |
235 | ||
236 | /* | |
237 | * When we have rt signals to deliver, we set up on the | |
238 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
239 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
240 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
241 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
242 | * positions as in older kernels). |
243 | * | |
244 | * Each of these things must be a multiple of 16 bytes in size. | |
245 | * | |
246 | */ | |
81e7009e SR |
247 | struct rt_sigframe { |
248 | #ifdef CONFIG_PPC64 | |
249 | compat_siginfo_t info; | |
250 | #else | |
251 | struct siginfo info; | |
252 | #endif | |
253 | struct ucontext uc; | |
2b0a576d MN |
254 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
255 | struct ucontext uc_transact; | |
256 | #endif | |
1da177e4 LT |
257 | /* |
258 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
259 | * regs and 18 fp regs below sp before decrementing it. | |
260 | */ | |
261 | int abigap[56]; | |
262 | }; | |
263 | ||
6a274c08 MN |
264 | #ifdef CONFIG_VSX |
265 | unsigned long copy_fpr_to_user(void __user *to, | |
266 | struct task_struct *task) | |
267 | { | |
de79f7b9 | 268 | u64 buf[ELF_NFPREG]; |
6a274c08 MN |
269 | int i; |
270 | ||
271 | /* save FPR copy to local buffer then write to the thread_struct */ | |
272 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
273 | buf[i] = task->thread.TS_FPR(i); | |
de79f7b9 | 274 | buf[i] = task->thread.fp_state.fpscr; |
6a274c08 MN |
275 | return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); |
276 | } | |
277 | ||
278 | unsigned long copy_fpr_from_user(struct task_struct *task, | |
279 | void __user *from) | |
280 | { | |
de79f7b9 | 281 | u64 buf[ELF_NFPREG]; |
6a274c08 MN |
282 | int i; |
283 | ||
284 | if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) | |
285 | return 1; | |
286 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
287 | task->thread.TS_FPR(i) = buf[i]; | |
de79f7b9 | 288 | task->thread.fp_state.fpscr = buf[i]; |
6a274c08 MN |
289 | |
290 | return 0; | |
291 | } | |
292 | ||
293 | unsigned long copy_vsx_to_user(void __user *to, | |
294 | struct task_struct *task) | |
295 | { | |
de79f7b9 | 296 | u64 buf[ELF_NVSRHALFREG]; |
6a274c08 MN |
297 | int i; |
298 | ||
299 | /* save FPR copy to local buffer then write to the thread_struct */ | |
300 | for (i = 0; i < ELF_NVSRHALFREG; i++) | |
de79f7b9 | 301 | buf[i] = task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET]; |
6a274c08 MN |
302 | return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); |
303 | } | |
304 | ||
305 | unsigned long copy_vsx_from_user(struct task_struct *task, | |
306 | void __user *from) | |
307 | { | |
de79f7b9 | 308 | u64 buf[ELF_NVSRHALFREG]; |
6a274c08 MN |
309 | int i; |
310 | ||
311 | if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) | |
312 | return 1; | |
313 | for (i = 0; i < ELF_NVSRHALFREG ; i++) | |
de79f7b9 | 314 | task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; |
6a274c08 MN |
315 | return 0; |
316 | } | |
2b0a576d MN |
317 | |
318 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
000ec280 | 319 | unsigned long copy_ckfpr_to_user(void __user *to, |
2b0a576d MN |
320 | struct task_struct *task) |
321 | { | |
de79f7b9 | 322 | u64 buf[ELF_NFPREG]; |
2b0a576d MN |
323 | int i; |
324 | ||
325 | /* save FPR copy to local buffer then write to the thread_struct */ | |
326 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
000ec280 CB |
327 | buf[i] = task->thread.TS_CKFPR(i); |
328 | buf[i] = task->thread.ckfp_state.fpscr; | |
2b0a576d MN |
329 | return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); |
330 | } | |
331 | ||
000ec280 | 332 | unsigned long copy_ckfpr_from_user(struct task_struct *task, |
2b0a576d MN |
333 | void __user *from) |
334 | { | |
de79f7b9 | 335 | u64 buf[ELF_NFPREG]; |
2b0a576d MN |
336 | int i; |
337 | ||
338 | if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) | |
339 | return 1; | |
340 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
000ec280 CB |
341 | task->thread.TS_CKFPR(i) = buf[i]; |
342 | task->thread.ckfp_state.fpscr = buf[i]; | |
2b0a576d MN |
343 | |
344 | return 0; | |
345 | } | |
346 | ||
000ec280 | 347 | unsigned long copy_ckvsx_to_user(void __user *to, |
2b0a576d MN |
348 | struct task_struct *task) |
349 | { | |
de79f7b9 | 350 | u64 buf[ELF_NVSRHALFREG]; |
2b0a576d MN |
351 | int i; |
352 | ||
353 | /* save FPR copy to local buffer then write to the thread_struct */ | |
354 | for (i = 0; i < ELF_NVSRHALFREG; i++) | |
000ec280 | 355 | buf[i] = task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET]; |
2b0a576d MN |
356 | return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); |
357 | } | |
358 | ||
000ec280 | 359 | unsigned long copy_ckvsx_from_user(struct task_struct *task, |
2b0a576d MN |
360 | void __user *from) |
361 | { | |
de79f7b9 | 362 | u64 buf[ELF_NVSRHALFREG]; |
2b0a576d MN |
363 | int i; |
364 | ||
365 | if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) | |
366 | return 1; | |
367 | for (i = 0; i < ELF_NVSRHALFREG ; i++) | |
000ec280 | 368 | task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; |
2b0a576d MN |
369 | return 0; |
370 | } | |
371 | #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ | |
6a274c08 MN |
372 | #else |
373 | inline unsigned long copy_fpr_to_user(void __user *to, | |
374 | struct task_struct *task) | |
375 | { | |
de79f7b9 | 376 | return __copy_to_user(to, task->thread.fp_state.fpr, |
6a274c08 MN |
377 | ELF_NFPREG * sizeof(double)); |
378 | } | |
379 | ||
380 | inline unsigned long copy_fpr_from_user(struct task_struct *task, | |
381 | void __user *from) | |
382 | { | |
de79f7b9 | 383 | return __copy_from_user(task->thread.fp_state.fpr, from, |
6a274c08 MN |
384 | ELF_NFPREG * sizeof(double)); |
385 | } | |
2b0a576d MN |
386 | |
387 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
000ec280 | 388 | inline unsigned long copy_ckfpr_to_user(void __user *to, |
2b0a576d MN |
389 | struct task_struct *task) |
390 | { | |
000ec280 | 391 | return __copy_to_user(to, task->thread.ckfp_state.fpr, |
2b0a576d MN |
392 | ELF_NFPREG * sizeof(double)); |
393 | } | |
394 | ||
000ec280 | 395 | inline unsigned long copy_ckfpr_from_user(struct task_struct *task, |
2b0a576d MN |
396 | void __user *from) |
397 | { | |
000ec280 | 398 | return __copy_from_user(task->thread.ckfp_state.fpr, from, |
2b0a576d MN |
399 | ELF_NFPREG * sizeof(double)); |
400 | } | |
401 | #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ | |
6a274c08 MN |
402 | #endif |
403 | ||
1da177e4 LT |
404 | /* |
405 | * Save the current user registers on the user stack. | |
81e7009e SR |
406 | * We only save the altivec/spe registers if the process has used |
407 | * altivec/spe instructions at some point. | |
1da177e4 | 408 | */ |
81e7009e | 409 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
1d25f11f MN |
410 | struct mcontext __user *tm_frame, int sigret, |
411 | int ctx_has_vsx_region) | |
1da177e4 | 412 | { |
9e751186 MN |
413 | unsigned long msr = regs->msr; |
414 | ||
1da177e4 LT |
415 | /* Make sure floating point registers are stored in regs */ |
416 | flush_fp_to_thread(current); | |
417 | ||
c6e6771b MN |
418 | /* save general registers */ |
419 | if (save_general_regs(regs, frame)) | |
1da177e4 LT |
420 | return 1; |
421 | ||
1da177e4 LT |
422 | #ifdef CONFIG_ALTIVEC |
423 | /* save altivec registers */ | |
424 | if (current->thread.used_vr) { | |
425 | flush_altivec_to_thread(current); | |
de79f7b9 | 426 | if (__copy_to_user(&frame->mc_vregs, ¤t->thread.vr_state, |
81e7009e | 427 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
428 | return 1; |
429 | /* set MSR_VEC in the saved MSR value to indicate that | |
430 | frame->mc_vregs contains valid data */ | |
9e751186 | 431 | msr |= MSR_VEC; |
1da177e4 LT |
432 | } |
433 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
434 | ||
435 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
436 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
437 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
438 | * most significant bits of that same vector. --BenH | |
408a7e08 | 439 | * Note that the current VRSAVE value is in the SPR at this point. |
1da177e4 | 440 | */ |
408a7e08 PM |
441 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
442 | current->thread.vrsave = mfspr(SPRN_VRSAVE); | |
1da177e4 LT |
443 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) |
444 | return 1; | |
445 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 | 446 | if (copy_fpr_to_user(&frame->mc_fregs, current)) |
c6e6771b | 447 | return 1; |
ec67ad82 MN |
448 | |
449 | /* | |
450 | * Clear the MSR VSX bit to indicate there is no valid state attached | |
451 | * to this context, except in the specific case below where we set it. | |
452 | */ | |
453 | msr &= ~MSR_VSX; | |
6a274c08 | 454 | #ifdef CONFIG_VSX |
ce48b210 MN |
455 | /* |
456 | * Copy VSR 0-31 upper half from thread_struct to local | |
457 | * buffer, then write that to userspace. Also set MSR_VSX in | |
458 | * the saved MSR value to indicate that frame->mc_vregs | |
459 | * contains valid data | |
460 | */ | |
16c29d18 | 461 | if (current->thread.used_vsr && ctx_has_vsx_region) { |
a7d623d4 | 462 | flush_vsx_to_thread(current); |
6a274c08 | 463 | if (copy_vsx_to_user(&frame->mc_vsregs, current)) |
ce48b210 MN |
464 | return 1; |
465 | msr |= MSR_VSX; | |
ec67ad82 | 466 | } |
c6e6771b | 467 | #endif /* CONFIG_VSX */ |
81e7009e SR |
468 | #ifdef CONFIG_SPE |
469 | /* save spe registers */ | |
470 | if (current->thread.used_spe) { | |
471 | flush_spe_to_thread(current); | |
472 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
473 | ELF_NEVRREG * sizeof(u32))) | |
474 | return 1; | |
475 | /* set MSR_SPE in the saved MSR value to indicate that | |
476 | frame->mc_vregs contains valid data */ | |
9e751186 | 477 | msr |= MSR_SPE; |
81e7009e SR |
478 | } |
479 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
480 | ||
481 | /* We always copy to/from spefscr */ | |
482 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
483 | return 1; | |
484 | #endif /* CONFIG_SPE */ | |
485 | ||
9e751186 MN |
486 | if (__put_user(msr, &frame->mc_gregs[PT_MSR])) |
487 | return 1; | |
1d25f11f MN |
488 | /* We need to write 0 the MSR top 32 bits in the tm frame so that we |
489 | * can check it on the restore to see if TM is active | |
490 | */ | |
491 | if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR])) | |
492 | return 1; | |
493 | ||
1da177e4 LT |
494 | if (sigret) { |
495 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
496 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
497 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
498 | return 1; | |
499 | flush_icache_range((unsigned long) &frame->tramp[0], | |
500 | (unsigned long) &frame->tramp[2]); | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
2b0a576d MN |
506 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
507 | /* | |
508 | * Save the current user registers on the user stack. | |
509 | * We only save the altivec/spe registers if the process has used | |
510 | * altivec/spe instructions at some point. | |
511 | * We also save the transactional registers to a second ucontext in the | |
512 | * frame. | |
513 | * | |
514 | * See save_user_regs() and signal_64.c:setup_tm_sigcontexts(). | |
515 | */ | |
516 | static int save_tm_user_regs(struct pt_regs *regs, | |
517 | struct mcontext __user *frame, | |
518 | struct mcontext __user *tm_frame, int sigret) | |
519 | { | |
520 | unsigned long msr = regs->msr; | |
521 | ||
d31626f7 PM |
522 | /* Remove TM bits from thread's MSR. The MSR in the sigcontext |
523 | * just indicates to userland that we were doing a transaction, but we | |
524 | * don't want to return in transactional state. This also ensures | |
525 | * that flush_fp_to_thread won't set TIF_RESTORE_TM again. | |
526 | */ | |
527 | regs->msr &= ~MSR_TS_MASK; | |
528 | ||
2b0a576d MN |
529 | /* Save both sets of general registers */ |
530 | if (save_general_regs(¤t->thread.ckpt_regs, frame) | |
531 | || save_general_regs(regs, tm_frame)) | |
532 | return 1; | |
533 | ||
534 | /* Stash the top half of the 64bit MSR into the 32bit MSR word | |
535 | * of the transactional mcontext. This way we have a backward-compatible | |
536 | * MSR in the 'normal' (checkpointed) mcontext and additionally one can | |
537 | * also look at what type of transaction (T or S) was active at the | |
538 | * time of the signal. | |
539 | */ | |
540 | if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR])) | |
541 | return 1; | |
542 | ||
543 | #ifdef CONFIG_ALTIVEC | |
544 | /* save altivec registers */ | |
545 | if (current->thread.used_vr) { | |
000ec280 | 546 | if (__copy_to_user(&frame->mc_vregs, ¤t->thread.ckvr_state, |
2b0a576d MN |
547 | ELF_NVRREG * sizeof(vector128))) |
548 | return 1; | |
549 | if (msr & MSR_VEC) { | |
550 | if (__copy_to_user(&tm_frame->mc_vregs, | |
dc310669 | 551 | ¤t->thread.vr_state, |
2b0a576d MN |
552 | ELF_NVRREG * sizeof(vector128))) |
553 | return 1; | |
554 | } else { | |
555 | if (__copy_to_user(&tm_frame->mc_vregs, | |
000ec280 | 556 | ¤t->thread.ckvr_state, |
2b0a576d MN |
557 | ELF_NVRREG * sizeof(vector128))) |
558 | return 1; | |
559 | } | |
560 | ||
561 | /* set MSR_VEC in the saved MSR value to indicate that | |
562 | * frame->mc_vregs contains valid data | |
563 | */ | |
564 | msr |= MSR_VEC; | |
565 | } | |
566 | ||
567 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
568 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
569 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
570 | * most significant bits of that same vector. --BenH | |
571 | */ | |
408a7e08 | 572 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
000ec280 CB |
573 | current->thread.ckvrsave = mfspr(SPRN_VRSAVE); |
574 | if (__put_user(current->thread.ckvrsave, | |
2b0a576d MN |
575 | (u32 __user *)&frame->mc_vregs[32])) |
576 | return 1; | |
577 | if (msr & MSR_VEC) { | |
dc310669 | 578 | if (__put_user(current->thread.vrsave, |
2b0a576d MN |
579 | (u32 __user *)&tm_frame->mc_vregs[32])) |
580 | return 1; | |
581 | } else { | |
000ec280 | 582 | if (__put_user(current->thread.ckvrsave, |
2b0a576d MN |
583 | (u32 __user *)&tm_frame->mc_vregs[32])) |
584 | return 1; | |
585 | } | |
586 | #endif /* CONFIG_ALTIVEC */ | |
587 | ||
000ec280 | 588 | if (copy_ckfpr_to_user(&frame->mc_fregs, current)) |
2b0a576d MN |
589 | return 1; |
590 | if (msr & MSR_FP) { | |
dc310669 | 591 | if (copy_fpr_to_user(&tm_frame->mc_fregs, current)) |
2b0a576d MN |
592 | return 1; |
593 | } else { | |
000ec280 | 594 | if (copy_ckfpr_to_user(&tm_frame->mc_fregs, current)) |
2b0a576d MN |
595 | return 1; |
596 | } | |
597 | ||
598 | #ifdef CONFIG_VSX | |
599 | /* | |
600 | * Copy VSR 0-31 upper half from thread_struct to local | |
601 | * buffer, then write that to userspace. Also set MSR_VSX in | |
602 | * the saved MSR value to indicate that frame->mc_vregs | |
603 | * contains valid data | |
604 | */ | |
605 | if (current->thread.used_vsr) { | |
000ec280 | 606 | if (copy_ckvsx_to_user(&frame->mc_vsregs, current)) |
2b0a576d MN |
607 | return 1; |
608 | if (msr & MSR_VSX) { | |
dc310669 | 609 | if (copy_vsx_to_user(&tm_frame->mc_vsregs, |
2b0a576d MN |
610 | current)) |
611 | return 1; | |
612 | } else { | |
000ec280 | 613 | if (copy_ckvsx_to_user(&tm_frame->mc_vsregs, current)) |
2b0a576d MN |
614 | return 1; |
615 | } | |
616 | ||
617 | msr |= MSR_VSX; | |
618 | } | |
619 | #endif /* CONFIG_VSX */ | |
620 | #ifdef CONFIG_SPE | |
621 | /* SPE regs are not checkpointed with TM, so this section is | |
622 | * simply the same as in save_user_regs(). | |
623 | */ | |
624 | if (current->thread.used_spe) { | |
625 | flush_spe_to_thread(current); | |
626 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
627 | ELF_NEVRREG * sizeof(u32))) | |
628 | return 1; | |
629 | /* set MSR_SPE in the saved MSR value to indicate that | |
630 | * frame->mc_vregs contains valid data */ | |
631 | msr |= MSR_SPE; | |
632 | } | |
633 | ||
634 | /* We always copy to/from spefscr */ | |
635 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
636 | return 1; | |
637 | #endif /* CONFIG_SPE */ | |
638 | ||
639 | if (__put_user(msr, &frame->mc_gregs[PT_MSR])) | |
640 | return 1; | |
641 | if (sigret) { | |
642 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
643 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
644 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
645 | return 1; | |
646 | flush_icache_range((unsigned long) &frame->tramp[0], | |
647 | (unsigned long) &frame->tramp[2]); | |
648 | } | |
649 | ||
650 | return 0; | |
651 | } | |
652 | #endif | |
653 | ||
1da177e4 LT |
654 | /* |
655 | * Restore the current user register values from the user stack, | |
656 | * (except for MSR). | |
657 | */ | |
658 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 659 | struct mcontext __user *sr, int sig) |
1da177e4 | 660 | { |
81e7009e | 661 | long err; |
1da177e4 | 662 | unsigned int save_r2 = 0; |
1da177e4 | 663 | unsigned long msr; |
c6e6771b | 664 | #ifdef CONFIG_VSX |
c6e6771b MN |
665 | int i; |
666 | #endif | |
1da177e4 LT |
667 | |
668 | /* | |
669 | * restore general registers but not including MSR or SOFTE. Also | |
670 | * take care of keeping r2 (TLS) intact if not a signal | |
671 | */ | |
672 | if (!sig) | |
673 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 674 | err = restore_general_regs(regs, sr); |
9a81c16b | 675 | regs->trap = 0; |
fab5db97 | 676 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
677 | if (!sig) |
678 | regs->gpr[2] = (unsigned long) save_r2; | |
679 | if (err) | |
680 | return 1; | |
681 | ||
fab5db97 PM |
682 | /* if doing signal return, restore the previous little-endian mode */ |
683 | if (sig) | |
684 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
685 | ||
1da177e4 | 686 | #ifdef CONFIG_ALTIVEC |
c6e6771b MN |
687 | /* |
688 | * Force the process to reload the altivec registers from | |
689 | * current->thread when it next does altivec instructions | |
690 | */ | |
1da177e4 | 691 | regs->msr &= ~MSR_VEC; |
fab5db97 | 692 | if (msr & MSR_VEC) { |
1da177e4 | 693 | /* restore altivec registers from the stack */ |
de79f7b9 | 694 | if (__copy_from_user(¤t->thread.vr_state, &sr->mc_vregs, |
1da177e4 LT |
695 | sizeof(sr->mc_vregs))) |
696 | return 1; | |
e1c0d66f | 697 | current->thread.used_vr = true; |
1da177e4 | 698 | } else if (current->thread.used_vr) |
de79f7b9 PM |
699 | memset(¤t->thread.vr_state, 0, |
700 | ELF_NVRREG * sizeof(vector128)); | |
1da177e4 LT |
701 | |
702 | /* Always get VRSAVE back */ | |
703 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
704 | return 1; | |
408a7e08 PM |
705 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
706 | mtspr(SPRN_VRSAVE, current->thread.vrsave); | |
1da177e4 | 707 | #endif /* CONFIG_ALTIVEC */ |
6a274c08 MN |
708 | if (copy_fpr_from_user(current, &sr->mc_fregs)) |
709 | return 1; | |
1da177e4 | 710 | |
c6e6771b | 711 | #ifdef CONFIG_VSX |
ce48b210 MN |
712 | /* |
713 | * Force the process to reload the VSX registers from | |
714 | * current->thread when it next does VSX instruction. | |
715 | */ | |
716 | regs->msr &= ~MSR_VSX; | |
717 | if (msr & MSR_VSX) { | |
718 | /* | |
719 | * Restore altivec registers from the stack to a local | |
720 | * buffer, then write this out to the thread_struct | |
721 | */ | |
6a274c08 | 722 | if (copy_vsx_from_user(current, &sr->mc_vsregs)) |
ce48b210 | 723 | return 1; |
e1c0d66f | 724 | current->thread.used_vsr = true; |
ce48b210 MN |
725 | } else if (current->thread.used_vsr) |
726 | for (i = 0; i < 32 ; i++) | |
de79f7b9 | 727 | current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0; |
c6e6771b MN |
728 | #endif /* CONFIG_VSX */ |
729 | /* | |
730 | * force the process to reload the FP registers from | |
731 | * current->thread when it next does FP instructions | |
732 | */ | |
733 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
734 | ||
81e7009e SR |
735 | #ifdef CONFIG_SPE |
736 | /* force the process to reload the spe registers from | |
737 | current->thread when it next does spe instructions */ | |
738 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 739 | if (msr & MSR_SPE) { |
81e7009e SR |
740 | /* restore spe registers from the stack */ |
741 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
742 | ELF_NEVRREG * sizeof(u32))) | |
743 | return 1; | |
e1c0d66f | 744 | current->thread.used_spe = true; |
81e7009e SR |
745 | } else if (current->thread.used_spe) |
746 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
747 | ||
748 | /* Always get SPEFSCR back */ | |
749 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
750 | return 1; | |
751 | #endif /* CONFIG_SPE */ | |
752 | ||
1da177e4 LT |
753 | return 0; |
754 | } | |
755 | ||
2b0a576d MN |
756 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
757 | /* | |
758 | * Restore the current user register values from the user stack, except for | |
759 | * MSR, and recheckpoint the original checkpointed register state for processes | |
760 | * in transactions. | |
761 | */ | |
762 | static long restore_tm_user_regs(struct pt_regs *regs, | |
763 | struct mcontext __user *sr, | |
764 | struct mcontext __user *tm_sr) | |
765 | { | |
766 | long err; | |
2c27a18f | 767 | unsigned long msr, msr_hi; |
2b0a576d MN |
768 | #ifdef CONFIG_VSX |
769 | int i; | |
770 | #endif | |
771 | ||
772 | /* | |
773 | * restore general registers but not including MSR or SOFTE. Also | |
774 | * take care of keeping r2 (TLS) intact if not a signal. | |
775 | * See comment in signal_64.c:restore_tm_sigcontexts(); | |
776 | * TFHAR is restored from the checkpointed NIP; TEXASR and TFIAR | |
777 | * were set by the signal delivery. | |
778 | */ | |
779 | err = restore_general_regs(regs, tm_sr); | |
780 | err |= restore_general_regs(¤t->thread.ckpt_regs, sr); | |
781 | ||
782 | err |= __get_user(current->thread.tm_tfhar, &sr->mc_gregs[PT_NIP]); | |
783 | ||
784 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); | |
785 | if (err) | |
786 | return 1; | |
787 | ||
788 | /* Restore the previous little-endian mode */ | |
789 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
790 | ||
2b0a576d MN |
791 | #ifdef CONFIG_ALTIVEC |
792 | regs->msr &= ~MSR_VEC; | |
793 | if (msr & MSR_VEC) { | |
794 | /* restore altivec registers from the stack */ | |
000ec280 | 795 | if (__copy_from_user(¤t->thread.ckvr_state, &sr->mc_vregs, |
2b0a576d | 796 | sizeof(sr->mc_vregs)) || |
dc310669 | 797 | __copy_from_user(¤t->thread.vr_state, |
2b0a576d MN |
798 | &tm_sr->mc_vregs, |
799 | sizeof(sr->mc_vregs))) | |
800 | return 1; | |
e1c0d66f | 801 | current->thread.used_vr = true; |
2b0a576d | 802 | } else if (current->thread.used_vr) { |
de79f7b9 PM |
803 | memset(¤t->thread.vr_state, 0, |
804 | ELF_NVRREG * sizeof(vector128)); | |
000ec280 | 805 | memset(¤t->thread.ckvr_state, 0, |
2b0a576d MN |
806 | ELF_NVRREG * sizeof(vector128)); |
807 | } | |
808 | ||
809 | /* Always get VRSAVE back */ | |
000ec280 | 810 | if (__get_user(current->thread.ckvrsave, |
2b0a576d | 811 | (u32 __user *)&sr->mc_vregs[32]) || |
dc310669 | 812 | __get_user(current->thread.vrsave, |
2b0a576d MN |
813 | (u32 __user *)&tm_sr->mc_vregs[32])) |
814 | return 1; | |
408a7e08 | 815 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
000ec280 | 816 | mtspr(SPRN_VRSAVE, current->thread.ckvrsave); |
2b0a576d MN |
817 | #endif /* CONFIG_ALTIVEC */ |
818 | ||
819 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
820 | ||
821 | if (copy_fpr_from_user(current, &sr->mc_fregs) || | |
000ec280 | 822 | copy_ckfpr_from_user(current, &tm_sr->mc_fregs)) |
2b0a576d MN |
823 | return 1; |
824 | ||
825 | #ifdef CONFIG_VSX | |
826 | regs->msr &= ~MSR_VSX; | |
827 | if (msr & MSR_VSX) { | |
828 | /* | |
829 | * Restore altivec registers from the stack to a local | |
830 | * buffer, then write this out to the thread_struct | |
831 | */ | |
dc310669 | 832 | if (copy_vsx_from_user(current, &tm_sr->mc_vsregs) || |
000ec280 | 833 | copy_ckvsx_from_user(current, &sr->mc_vsregs)) |
2b0a576d | 834 | return 1; |
e1c0d66f | 835 | current->thread.used_vsr = true; |
2b0a576d MN |
836 | } else if (current->thread.used_vsr) |
837 | for (i = 0; i < 32 ; i++) { | |
de79f7b9 | 838 | current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0; |
000ec280 | 839 | current->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0; |
2b0a576d MN |
840 | } |
841 | #endif /* CONFIG_VSX */ | |
842 | ||
843 | #ifdef CONFIG_SPE | |
844 | /* SPE regs are not checkpointed with TM, so this section is | |
845 | * simply the same as in restore_user_regs(). | |
846 | */ | |
847 | regs->msr &= ~MSR_SPE; | |
848 | if (msr & MSR_SPE) { | |
849 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
850 | ELF_NEVRREG * sizeof(u32))) | |
851 | return 1; | |
e1c0d66f | 852 | current->thread.used_spe = true; |
2b0a576d MN |
853 | } else if (current->thread.used_spe) |
854 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
855 | ||
856 | /* Always get SPEFSCR back */ | |
857 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs | |
858 | + ELF_NEVRREG)) | |
859 | return 1; | |
860 | #endif /* CONFIG_SPE */ | |
861 | ||
d2b9d2a5 MN |
862 | /* Get the top half of the MSR from the user context */ |
863 | if (__get_user(msr_hi, &tm_sr->mc_gregs[PT_MSR])) | |
864 | return 1; | |
865 | msr_hi <<= 32; | |
866 | /* If TM bits are set to the reserved value, it's an invalid context */ | |
867 | if (MSR_TM_RESV(msr_hi)) | |
868 | return 1; | |
869 | /* Pull in the MSR TM bits from the user context */ | |
870 | regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr_hi & MSR_TS_MASK); | |
2b0a576d MN |
871 | /* Now, recheckpoint. This loads up all of the checkpointed (older) |
872 | * registers, including FP and V[S]Rs. After recheckpointing, the | |
873 | * transactional versions should be loaded. | |
874 | */ | |
875 | tm_enable(); | |
e6b8fd02 MN |
876 | /* Make sure the transaction is marked as failed */ |
877 | current->thread.tm_texasr |= TEXASR_FS; | |
2b0a576d MN |
878 | /* This loads the checkpointed FP/VEC state, if used */ |
879 | tm_recheckpoint(¤t->thread, msr); | |
2b0a576d MN |
880 | |
881 | /* This loads the speculative FP/VEC state, if used */ | |
dc310669 | 882 | msr_check_and_set(msr & (MSR_FP | MSR_VEC)); |
2b0a576d | 883 | if (msr & MSR_FP) { |
dc310669 | 884 | load_fp_state(¤t->thread.fp_state); |
2b0a576d MN |
885 | regs->msr |= (MSR_FP | current->thread.fpexc_mode); |
886 | } | |
f110c0c1 | 887 | #ifdef CONFIG_ALTIVEC |
2b0a576d | 888 | if (msr & MSR_VEC) { |
dc310669 | 889 | load_vr_state(¤t->thread.vr_state); |
2b0a576d MN |
890 | regs->msr |= MSR_VEC; |
891 | } | |
f110c0c1 | 892 | #endif |
2b0a576d MN |
893 | |
894 | return 0; | |
895 | } | |
896 | #endif | |
897 | ||
81e7009e | 898 | #ifdef CONFIG_PPC64 |
ce395960 | 899 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, const siginfo_t *s) |
1da177e4 LT |
900 | { |
901 | int err; | |
902 | ||
903 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
904 | return -EFAULT; | |
905 | ||
906 | /* If you change siginfo_t structure, please be sure | |
907 | * this code is fixed accordingly. | |
908 | * It should never copy any pad contained in the structure | |
909 | * to avoid security leaks, but must copy the generic | |
910 | * 3 ints plus the relevant union member. | |
911 | * This routine must convert siginfo from 64bit to 32bit as well | |
912 | * at the same time. | |
913 | */ | |
914 | err = __put_user(s->si_signo, &d->si_signo); | |
915 | err |= __put_user(s->si_errno, &d->si_errno); | |
cc731525 | 916 | err |= __put_user(s->si_code, &d->si_code); |
1da177e4 LT |
917 | if (s->si_code < 0) |
918 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
919 | SI_PAD_SIZE32); | |
cc731525 EB |
920 | else switch(siginfo_layout(s->si_signo, s->si_code)) { |
921 | case SIL_CHLD: | |
1da177e4 LT |
922 | err |= __put_user(s->si_pid, &d->si_pid); |
923 | err |= __put_user(s->si_uid, &d->si_uid); | |
924 | err |= __put_user(s->si_utime, &d->si_utime); | |
925 | err |= __put_user(s->si_stime, &d->si_stime); | |
926 | err |= __put_user(s->si_status, &d->si_status); | |
927 | break; | |
cc731525 | 928 | case SIL_FAULT: |
1da177e4 LT |
929 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, |
930 | &d->si_addr); | |
931 | break; | |
cc731525 | 932 | case SIL_POLL: |
1da177e4 LT |
933 | err |= __put_user(s->si_band, &d->si_band); |
934 | err |= __put_user(s->si_fd, &d->si_fd); | |
935 | break; | |
cc731525 | 936 | case SIL_TIMER: |
1da177e4 LT |
937 | err |= __put_user(s->si_tid, &d->si_tid); |
938 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
939 | err |= __put_user(s->si_int, &d->si_int); | |
940 | break; | |
cc731525 | 941 | case SIL_SYS: |
1b60bab0 ME |
942 | err |= __put_user(ptr_to_compat(s->si_call_addr), &d->si_call_addr); |
943 | err |= __put_user(s->si_syscall, &d->si_syscall); | |
944 | err |= __put_user(s->si_arch, &d->si_arch); | |
945 | break; | |
cc731525 | 946 | case SIL_RT: |
1da177e4 LT |
947 | err |= __put_user(s->si_int, &d->si_int); |
948 | /* fallthrough */ | |
cc731525 | 949 | case SIL_KILL: |
1da177e4 LT |
950 | err |= __put_user(s->si_pid, &d->si_pid); |
951 | err |= __put_user(s->si_uid, &d->si_uid); | |
952 | break; | |
953 | } | |
954 | return err; | |
955 | } | |
956 | ||
81e7009e SR |
957 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
958 | ||
9c0c44db RM |
959 | int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) |
960 | { | |
9c0c44db RM |
961 | if (copy_from_user(to, from, 3*sizeof(int)) || |
962 | copy_from_user(to->_sifields._pad, | |
963 | from->_sifields._pad, SI_PAD_SIZE32)) | |
964 | return -EFAULT; | |
965 | ||
966 | return 0; | |
967 | } | |
81e7009e | 968 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 969 | |
1da177e4 LT |
970 | /* |
971 | * Set up a signal frame for a "real-time" signal handler | |
972 | * (one which gets siginfo). | |
973 | */ | |
129b69df | 974 | int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset, |
d1199431 | 975 | struct task_struct *tsk) |
1da177e4 | 976 | { |
81e7009e SR |
977 | struct rt_sigframe __user *rt_sf; |
978 | struct mcontext __user *frame; | |
1d25f11f | 979 | struct mcontext __user *tm_frame = NULL; |
d0c3d534 | 980 | void __user *addr; |
a3f61dc0 | 981 | unsigned long newsp = 0; |
2b0a576d MN |
982 | int sigret; |
983 | unsigned long tramp; | |
d1199431 CB |
984 | struct pt_regs *regs = tsk->thread.regs; |
985 | ||
986 | BUG_ON(tsk != current); | |
1da177e4 LT |
987 | |
988 | /* Set up Signal Frame */ | |
989 | /* Put a Real Time Context onto stack */ | |
d1199431 | 990 | rt_sf = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*rt_sf), 1); |
d0c3d534 | 991 | addr = rt_sf; |
a3f61dc0 | 992 | if (unlikely(rt_sf == NULL)) |
1da177e4 LT |
993 | goto badframe; |
994 | ||
1da177e4 | 995 | /* Put the siginfo & fill in most of the ucontext */ |
129b69df | 996 | if (copy_siginfo_to_user(&rt_sf->info, &ksig->info) |
1da177e4 | 997 | || __put_user(0, &rt_sf->uc.uc_flags) |
7cce2465 | 998 | || __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1]) |
81e7009e SR |
999 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
1000 | &rt_sf->uc.uc_regs) | |
1001 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
1002 | goto badframe; |
1003 | ||
1004 | /* Save user registers on the stack */ | |
1005 | frame = &rt_sf->uc.uc_mcontext; | |
d0c3d534 | 1006 | addr = frame; |
d1199431 | 1007 | if (vdso32_rt_sigtramp && tsk->mm->context.vdso_base) { |
2b0a576d | 1008 | sigret = 0; |
d1199431 | 1009 | tramp = tsk->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 1010 | } else { |
2b0a576d MN |
1011 | sigret = __NR_rt_sigreturn; |
1012 | tramp = (unsigned long) frame->tramp; | |
1013 | } | |
1014 | ||
1015 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
1d25f11f | 1016 | tm_frame = &rt_sf->uc_transact.uc_mcontext; |
2b0a576d | 1017 | if (MSR_TM_ACTIVE(regs->msr)) { |
d765ff23 PM |
1018 | if (__put_user((unsigned long)&rt_sf->uc_transact, |
1019 | &rt_sf->uc.uc_link) || | |
1020 | __put_user((unsigned long)tm_frame, | |
1021 | &rt_sf->uc_transact.uc_regs)) | |
1022 | goto badframe; | |
1d25f11f | 1023 | if (save_tm_user_regs(regs, frame, tm_frame, sigret)) |
1da177e4 | 1024 | goto badframe; |
1da177e4 | 1025 | } |
2b0a576d MN |
1026 | else |
1027 | #endif | |
1d25f11f | 1028 | { |
d765ff23 PM |
1029 | if (__put_user(0, &rt_sf->uc.uc_link)) |
1030 | goto badframe; | |
1d25f11f | 1031 | if (save_user_regs(regs, frame, tm_frame, sigret, 1)) |
2b0a576d | 1032 | goto badframe; |
1d25f11f | 1033 | } |
2b0a576d MN |
1034 | regs->link = tramp; |
1035 | ||
d1199431 | 1036 | tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */ |
cc657f53 | 1037 | |
a3f61dc0 BH |
1038 | /* create a stack frame for the caller of the handler */ |
1039 | newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16); | |
d0c3d534 | 1040 | addr = (void __user *)regs->gpr[1]; |
e2b55306 | 1041 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e | 1042 | goto badframe; |
a3f61dc0 BH |
1043 | |
1044 | /* Fill registers for signal handler */ | |
81e7009e | 1045 | regs->gpr[1] = newsp; |
129b69df | 1046 | regs->gpr[3] = ksig->sig; |
1da177e4 LT |
1047 | regs->gpr[4] = (unsigned long) &rt_sf->info; |
1048 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
1049 | regs->gpr[6] = (unsigned long) rt_sf; | |
129b69df | 1050 | regs->nip = (unsigned long) ksig->ka.sa.sa_handler; |
e871c6bb | 1051 | /* enter the signal handler in native-endian mode */ |
fab5db97 | 1052 | regs->msr &= ~MSR_LE; |
e871c6bb | 1053 | regs->msr |= (MSR_KERNEL & MSR_LE); |
129b69df | 1054 | return 0; |
1da177e4 LT |
1055 | |
1056 | badframe: | |
76462232 CD |
1057 | if (show_unhandled_signals) |
1058 | printk_ratelimited(KERN_INFO | |
1059 | "%s[%d]: bad frame in handle_rt_signal32: " | |
1060 | "%p nip %08lx lr %08lx\n", | |
d1199431 | 1061 | tsk->comm, tsk->pid, |
76462232 | 1062 | addr, regs->nip, regs->link); |
d0c3d534 | 1063 | |
129b69df | 1064 | return 1; |
1da177e4 LT |
1065 | } |
1066 | ||
81e7009e | 1067 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 1068 | { |
1da177e4 | 1069 | sigset_t set; |
81e7009e SR |
1070 | struct mcontext __user *mcp; |
1071 | ||
1072 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
1073 | return -EFAULT; | |
1074 | #ifdef CONFIG_PPC64 | |
1075 | { | |
1076 | u32 cmcp; | |
1da177e4 | 1077 | |
81e7009e SR |
1078 | if (__get_user(cmcp, &ucp->uc_regs)) |
1079 | return -EFAULT; | |
1080 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 1081 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
1082 | } |
1083 | #else | |
1084 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 1085 | return -EFAULT; |
7c85d1f9 PM |
1086 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
1087 | return -EFAULT; | |
81e7009e | 1088 | #endif |
17440f17 | 1089 | set_current_blocked(&set); |
81e7009e | 1090 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
1091 | return -EFAULT; |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
2b0a576d MN |
1096 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1097 | static int do_setcontext_tm(struct ucontext __user *ucp, | |
1098 | struct ucontext __user *tm_ucp, | |
1099 | struct pt_regs *regs) | |
1100 | { | |
1101 | sigset_t set; | |
1102 | struct mcontext __user *mcp; | |
1103 | struct mcontext __user *tm_mcp; | |
1104 | u32 cmcp; | |
1105 | u32 tm_cmcp; | |
1106 | ||
1107 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
1108 | return -EFAULT; | |
1109 | ||
1110 | if (__get_user(cmcp, &ucp->uc_regs) || | |
1111 | __get_user(tm_cmcp, &tm_ucp->uc_regs)) | |
1112 | return -EFAULT; | |
1113 | mcp = (struct mcontext __user *)(u64)cmcp; | |
1114 | tm_mcp = (struct mcontext __user *)(u64)tm_cmcp; | |
1115 | /* no need to check access_ok(mcp), since mcp < 4GB */ | |
1116 | ||
1117 | set_current_blocked(&set); | |
1118 | if (restore_tm_user_regs(regs, mcp, tm_mcp)) | |
1119 | return -EFAULT; | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | #endif | |
1124 | ||
81e7009e | 1125 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
1126 | struct ucontext __user *new_ctx, |
1127 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
1128 | { |
1129 | unsigned char tmp; | |
16c29d18 | 1130 | int ctx_has_vsx_region = 0; |
1da177e4 | 1131 | |
c1cb299e MN |
1132 | #ifdef CONFIG_PPC64 |
1133 | unsigned long new_msr = 0; | |
1134 | ||
77eb50ae AS |
1135 | if (new_ctx) { |
1136 | struct mcontext __user *mcp; | |
1137 | u32 cmcp; | |
1138 | ||
1139 | /* | |
1140 | * Get pointer to the real mcontext. No need for | |
1141 | * access_ok since we are dealing with compat | |
1142 | * pointers. | |
1143 | */ | |
1144 | if (__get_user(cmcp, &new_ctx->uc_regs)) | |
1145 | return -EFAULT; | |
1146 | mcp = (struct mcontext __user *)(u64)cmcp; | |
1147 | if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR])) | |
1148 | return -EFAULT; | |
1149 | } | |
c1cb299e MN |
1150 | /* |
1151 | * Check that the context is not smaller than the original | |
1152 | * size (with VMX but without VSX) | |
1153 | */ | |
1154 | if (ctx_size < UCONTEXTSIZEWITHOUTVSX) | |
1155 | return -EINVAL; | |
1156 | /* | |
1157 | * If the new context state sets the MSR VSX bits but | |
1158 | * it doesn't provide VSX state. | |
1159 | */ | |
1160 | if ((ctx_size < sizeof(struct ucontext)) && | |
1161 | (new_msr & MSR_VSX)) | |
1162 | return -EINVAL; | |
16c29d18 MN |
1163 | /* Does the context have enough room to store VSX data? */ |
1164 | if (ctx_size >= sizeof(struct ucontext)) | |
1165 | ctx_has_vsx_region = 1; | |
c1cb299e | 1166 | #else |
1da177e4 LT |
1167 | /* Context size is for future use. Right now, we only make sure |
1168 | * we are passed something we understand | |
1169 | */ | |
81e7009e | 1170 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 | 1171 | return -EINVAL; |
c1cb299e | 1172 | #endif |
1da177e4 | 1173 | if (old_ctx != NULL) { |
1c9bb1a0 PM |
1174 | struct mcontext __user *mctx; |
1175 | ||
1176 | /* | |
1177 | * old_ctx might not be 16-byte aligned, in which | |
1178 | * case old_ctx->uc_mcontext won't be either. | |
1179 | * Because we have the old_ctx->uc_pad2 field | |
1180 | * before old_ctx->uc_mcontext, we need to round down | |
1181 | * from &old_ctx->uc_mcontext to a 16-byte boundary. | |
1182 | */ | |
1183 | mctx = (struct mcontext __user *) | |
1184 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); | |
16c29d18 | 1185 | if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size) |
1d25f11f | 1186 | || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region) |
81e7009e | 1187 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
1c9bb1a0 | 1188 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
1da177e4 LT |
1189 | return -EFAULT; |
1190 | } | |
1191 | if (new_ctx == NULL) | |
1192 | return 0; | |
16c29d18 | 1193 | if (!access_ok(VERIFY_READ, new_ctx, ctx_size) |
1da177e4 | 1194 | || __get_user(tmp, (u8 __user *) new_ctx) |
16c29d18 | 1195 | || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1)) |
1da177e4 LT |
1196 | return -EFAULT; |
1197 | ||
1198 | /* | |
1199 | * If we get a fault copying the context into the kernel's | |
1200 | * image of the user's registers, we can't just return -EFAULT | |
1201 | * because the user's registers will be corrupted. For instance | |
1202 | * the NIP value may have been updated but not some of the | |
1203 | * other registers. Given that we have done the access_ok | |
1204 | * and successfully read the first and last bytes of the region | |
1205 | * above, this should only happen in an out-of-memory situation | |
1206 | * or if another thread unmaps the region containing the context. | |
1207 | * We kill the task with a SIGSEGV in this situation. | |
1208 | */ | |
81e7009e | 1209 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 1210 | do_exit(SIGSEGV); |
401d1f02 DW |
1211 | |
1212 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
1213 | return 0; |
1214 | } | |
1215 | ||
81e7009e | 1216 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1217 | struct pt_regs *regs) |
1218 | { | |
81e7009e | 1219 | struct rt_sigframe __user *rt_sf; |
2b0a576d MN |
1220 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1221 | struct ucontext __user *uc_transact; | |
1222 | unsigned long msr_hi; | |
1223 | unsigned long tmp; | |
1224 | int tm_restore = 0; | |
1225 | #endif | |
1da177e4 | 1226 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 1227 | current->restart_block.fn = do_no_restart_syscall; |
1da177e4 | 1228 | |
81e7009e SR |
1229 | rt_sf = (struct rt_sigframe __user *) |
1230 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
1231 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
1232 | goto bad; | |
78a3e888 | 1233 | |
2b0a576d | 1234 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
78a3e888 CB |
1235 | /* |
1236 | * If there is a transactional state then throw it away. | |
1237 | * The purpose of a sigreturn is to destroy all traces of the | |
1238 | * signal frame, this includes any transactional state created | |
1239 | * within in. We only check for suspended as we can never be | |
1240 | * active in the kernel, we are active, there is nothing better to | |
1241 | * do than go ahead and Bad Thing later. | |
1242 | * The cause is not important as there will never be a | |
1243 | * recheckpoint so it's not user visible. | |
1244 | */ | |
1245 | if (MSR_TM_SUSPENDED(mfmsr())) | |
1246 | tm_reclaim_current(0); | |
1247 | ||
2b0a576d MN |
1248 | if (__get_user(tmp, &rt_sf->uc.uc_link)) |
1249 | goto bad; | |
1250 | uc_transact = (struct ucontext __user *)(uintptr_t)tmp; | |
1251 | if (uc_transact) { | |
1252 | u32 cmcp; | |
1253 | struct mcontext __user *mcp; | |
1254 | ||
1255 | if (__get_user(cmcp, &uc_transact->uc_regs)) | |
1256 | return -EFAULT; | |
1257 | mcp = (struct mcontext __user *)(u64)cmcp; | |
1258 | /* The top 32 bits of the MSR are stashed in the transactional | |
1259 | * ucontext. */ | |
1260 | if (__get_user(msr_hi, &mcp->mc_gregs[PT_MSR])) | |
1261 | goto bad; | |
1262 | ||
55e43418 | 1263 | if (MSR_TM_ACTIVE(msr_hi<<32)) { |
2b0a576d MN |
1264 | /* We only recheckpoint on return if we're |
1265 | * transaction. | |
1266 | */ | |
1267 | tm_restore = 1; | |
1268 | if (do_setcontext_tm(&rt_sf->uc, uc_transact, regs)) | |
1269 | goto bad; | |
1270 | } | |
1271 | } | |
1272 | if (!tm_restore) | |
1273 | /* Fall through, for non-TM restore */ | |
1274 | #endif | |
81e7009e | 1275 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
1276 | goto bad; |
1277 | ||
1278 | /* | |
1279 | * It's not clear whether or why it is desirable to save the | |
1280 | * sigaltstack setting on signal delivery and restore it on | |
1281 | * signal return. But other architectures do this and we have | |
1282 | * always done it up until now so it is probably better not to | |
1283 | * change it. -- paulus | |
81e7009e SR |
1284 | */ |
1285 | #ifdef CONFIG_PPC64 | |
7cce2465 AV |
1286 | if (compat_restore_altstack(&rt_sf->uc.uc_stack)) |
1287 | goto bad; | |
81e7009e | 1288 | #else |
7cce2465 AV |
1289 | if (restore_altstack(&rt_sf->uc.uc_stack)) |
1290 | goto bad; | |
81e7009e | 1291 | #endif |
401d1f02 DW |
1292 | set_thread_flag(TIF_RESTOREALL); |
1293 | return 0; | |
1da177e4 LT |
1294 | |
1295 | bad: | |
76462232 CD |
1296 | if (show_unhandled_signals) |
1297 | printk_ratelimited(KERN_INFO | |
1298 | "%s[%d]: bad frame in sys_rt_sigreturn: " | |
1299 | "%p nip %08lx lr %08lx\n", | |
1300 | current->comm, current->pid, | |
1301 | rt_sf, regs->nip, regs->link); | |
d0c3d534 | 1302 | |
1da177e4 LT |
1303 | force_sig(SIGSEGV, current); |
1304 | return 0; | |
1305 | } | |
1306 | ||
81e7009e SR |
1307 | #ifdef CONFIG_PPC32 |
1308 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
1309 | int ndbg, struct sig_dbg_op __user *dbg, | |
1310 | int r6, int r7, int r8, | |
1311 | struct pt_regs *regs) | |
1312 | { | |
1313 | struct sig_dbg_op op; | |
1314 | int i; | |
7c85d1f9 | 1315 | unsigned char tmp; |
81e7009e | 1316 | unsigned long new_msr = regs->msr; |
172ae2e7 | 1317 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
51ae8d4a | 1318 | unsigned long new_dbcr0 = current->thread.debug.dbcr0; |
81e7009e SR |
1319 | #endif |
1320 | ||
1321 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 1322 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
1323 | return -EFAULT; |
1324 | switch (op.dbg_type) { | |
1325 | case SIG_DBG_SINGLE_STEPPING: | |
172ae2e7 | 1326 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1327 | if (op.dbg_value) { |
1328 | new_msr |= MSR_DE; | |
1329 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
1330 | } else { | |
3bffb652 DK |
1331 | new_dbcr0 &= ~DBCR0_IC; |
1332 | if (!DBCR_ACTIVE_EVENTS(new_dbcr0, | |
51ae8d4a | 1333 | current->thread.debug.dbcr1)) { |
3bffb652 DK |
1334 | new_msr &= ~MSR_DE; |
1335 | new_dbcr0 &= ~DBCR0_IDM; | |
1336 | } | |
81e7009e SR |
1337 | } |
1338 | #else | |
1339 | if (op.dbg_value) | |
1340 | new_msr |= MSR_SE; | |
1341 | else | |
1342 | new_msr &= ~MSR_SE; | |
1343 | #endif | |
1344 | break; | |
1345 | case SIG_DBG_BRANCH_TRACING: | |
172ae2e7 | 1346 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1347 | return -EINVAL; |
1348 | #else | |
1349 | if (op.dbg_value) | |
1350 | new_msr |= MSR_BE; | |
1351 | else | |
1352 | new_msr &= ~MSR_BE; | |
1353 | #endif | |
1354 | break; | |
1355 | ||
1356 | default: | |
1357 | return -EINVAL; | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | /* We wait until here to actually install the values in the | |
1362 | registers so if we fail in the above loop, it will not | |
1363 | affect the contents of these registers. After this point, | |
1364 | failure is a problem, anyway, and it's very unlikely unless | |
1365 | the user is really doing something wrong. */ | |
1366 | regs->msr = new_msr; | |
172ae2e7 | 1367 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
51ae8d4a | 1368 | current->thread.debug.dbcr0 = new_dbcr0; |
81e7009e SR |
1369 | #endif |
1370 | ||
7c85d1f9 PM |
1371 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
1372 | || __get_user(tmp, (u8 __user *) ctx) | |
1373 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) | |
1374 | return -EFAULT; | |
1375 | ||
81e7009e SR |
1376 | /* |
1377 | * If we get a fault copying the context into the kernel's | |
1378 | * image of the user's registers, we can't just return -EFAULT | |
1379 | * because the user's registers will be corrupted. For instance | |
1380 | * the NIP value may have been updated but not some of the | |
1381 | * other registers. Given that we have done the access_ok | |
1382 | * and successfully read the first and last bytes of the region | |
1383 | * above, this should only happen in an out-of-memory situation | |
1384 | * or if another thread unmaps the region containing the context. | |
1385 | * We kill the task with a SIGSEGV in this situation. | |
1386 | */ | |
1387 | if (do_setcontext(ctx, regs, 1)) { | |
76462232 CD |
1388 | if (show_unhandled_signals) |
1389 | printk_ratelimited(KERN_INFO "%s[%d]: bad frame in " | |
1390 | "sys_debug_setcontext: %p nip %08lx " | |
1391 | "lr %08lx\n", | |
1392 | current->comm, current->pid, | |
1393 | ctx, regs->nip, regs->link); | |
d0c3d534 | 1394 | |
81e7009e SR |
1395 | force_sig(SIGSEGV, current); |
1396 | goto out; | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * It's not clear whether or why it is desirable to save the | |
1401 | * sigaltstack setting on signal delivery and restore it on | |
1402 | * signal return. But other architectures do this and we have | |
1403 | * always done it up until now so it is probably better not to | |
1404 | * change it. -- paulus | |
1405 | */ | |
7cce2465 | 1406 | restore_altstack(&ctx->uc_stack); |
81e7009e | 1407 | |
401d1f02 | 1408 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
1409 | out: |
1410 | return 0; | |
1411 | } | |
1412 | #endif | |
1da177e4 LT |
1413 | |
1414 | /* | |
1415 | * OK, we're invoking a handler | |
1416 | */ | |
d1199431 CB |
1417 | int handle_signal32(struct ksignal *ksig, sigset_t *oldset, |
1418 | struct task_struct *tsk) | |
1da177e4 | 1419 | { |
81e7009e | 1420 | struct sigcontext __user *sc; |
a3f61dc0 | 1421 | struct sigframe __user *frame; |
1d25f11f | 1422 | struct mcontext __user *tm_mctx = NULL; |
a3f61dc0 | 1423 | unsigned long newsp = 0; |
2b0a576d MN |
1424 | int sigret; |
1425 | unsigned long tramp; | |
d1199431 CB |
1426 | struct pt_regs *regs = tsk->thread.regs; |
1427 | ||
1428 | BUG_ON(tsk != current); | |
1da177e4 LT |
1429 | |
1430 | /* Set up Signal Frame */ | |
d1199431 | 1431 | frame = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*frame), 1); |
a3f61dc0 | 1432 | if (unlikely(frame == NULL)) |
1da177e4 | 1433 | goto badframe; |
a3f61dc0 | 1434 | sc = (struct sigcontext __user *) &frame->sctx; |
1da177e4 LT |
1435 | |
1436 | #if _NSIG != 64 | |
81e7009e | 1437 | #error "Please adjust handle_signal()" |
1da177e4 | 1438 | #endif |
129b69df | 1439 | if (__put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler) |
1da177e4 | 1440 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1441 | #ifdef CONFIG_PPC64 |
1da177e4 | 1442 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1443 | #else |
1444 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1445 | #endif | |
a3f61dc0 | 1446 | || __put_user(to_user_ptr(&frame->mctx), &sc->regs) |
129b69df | 1447 | || __put_user(ksig->sig, &sc->signal)) |
1da177e4 LT |
1448 | goto badframe; |
1449 | ||
d1199431 | 1450 | if (vdso32_sigtramp && tsk->mm->context.vdso_base) { |
2b0a576d | 1451 | sigret = 0; |
d1199431 | 1452 | tramp = tsk->mm->context.vdso_base + vdso32_sigtramp; |
a7f290da | 1453 | } else { |
2b0a576d MN |
1454 | sigret = __NR_sigreturn; |
1455 | tramp = (unsigned long) frame->mctx.tramp; | |
1456 | } | |
1457 | ||
1458 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM | |
1d25f11f | 1459 | tm_mctx = &frame->mctx_transact; |
2b0a576d MN |
1460 | if (MSR_TM_ACTIVE(regs->msr)) { |
1461 | if (save_tm_user_regs(regs, &frame->mctx, &frame->mctx_transact, | |
1462 | sigret)) | |
1da177e4 | 1463 | goto badframe; |
1da177e4 | 1464 | } |
2b0a576d MN |
1465 | else |
1466 | #endif | |
1d25f11f MN |
1467 | { |
1468 | if (save_user_regs(regs, &frame->mctx, tm_mctx, sigret, 1)) | |
2b0a576d | 1469 | goto badframe; |
1d25f11f | 1470 | } |
2b0a576d MN |
1471 | |
1472 | regs->link = tramp; | |
1da177e4 | 1473 | |
d1199431 | 1474 | tsk->thread.fp_state.fpscr = 0; /* turn off all fp exceptions */ |
cc657f53 | 1475 | |
a3f61dc0 BH |
1476 | /* create a stack frame for the caller of the handler */ |
1477 | newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; | |
9747dd6f | 1478 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1479 | goto badframe; |
a3f61dc0 | 1480 | |
81e7009e | 1481 | regs->gpr[1] = newsp; |
129b69df | 1482 | regs->gpr[3] = ksig->sig; |
1da177e4 | 1483 | regs->gpr[4] = (unsigned long) sc; |
129b69df | 1484 | regs->nip = (unsigned long) (unsigned long)ksig->ka.sa.sa_handler; |
fab5db97 PM |
1485 | /* enter the signal handler in big-endian mode */ |
1486 | regs->msr &= ~MSR_LE; | |
129b69df | 1487 | return 0; |
1da177e4 LT |
1488 | |
1489 | badframe: | |
76462232 CD |
1490 | if (show_unhandled_signals) |
1491 | printk_ratelimited(KERN_INFO | |
1492 | "%s[%d]: bad frame in handle_signal32: " | |
1493 | "%p nip %08lx lr %08lx\n", | |
d1199431 | 1494 | tsk->comm, tsk->pid, |
76462232 | 1495 | frame, regs->nip, regs->link); |
d0c3d534 | 1496 | |
129b69df | 1497 | return 1; |
1da177e4 LT |
1498 | } |
1499 | ||
1500 | /* | |
1501 | * Do a signal return; undo the signal stack. | |
1502 | */ | |
81e7009e | 1503 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1504 | struct pt_regs *regs) |
1505 | { | |
fee55450 | 1506 | struct sigframe __user *sf; |
81e7009e SR |
1507 | struct sigcontext __user *sc; |
1508 | struct sigcontext sigctx; | |
1509 | struct mcontext __user *sr; | |
d0c3d534 | 1510 | void __user *addr; |
1da177e4 | 1511 | sigset_t set; |
fee55450 MN |
1512 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1513 | struct mcontext __user *mcp, *tm_mcp; | |
1514 | unsigned long msr_hi; | |
1515 | #endif | |
1da177e4 LT |
1516 | |
1517 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 1518 | current->restart_block.fn = do_no_restart_syscall; |
1da177e4 | 1519 | |
fee55450 MN |
1520 | sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
1521 | sc = &sf->sctx; | |
d0c3d534 | 1522 | addr = sc; |
1da177e4 LT |
1523 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1524 | goto badframe; | |
1525 | ||
81e7009e | 1526 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1527 | /* |
1528 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1529 | * unused part of the signal stackframe | |
1530 | */ | |
1531 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1532 | #else |
1533 | set.sig[0] = sigctx.oldmask; | |
1534 | set.sig[1] = sigctx._unused[3]; | |
1535 | #endif | |
17440f17 | 1536 | set_current_blocked(&set); |
1da177e4 | 1537 | |
fee55450 MN |
1538 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
1539 | mcp = (struct mcontext __user *)&sf->mctx; | |
1540 | tm_mcp = (struct mcontext __user *)&sf->mctx_transact; | |
1541 | if (__get_user(msr_hi, &tm_mcp->mc_gregs[PT_MSR])) | |
1da177e4 | 1542 | goto badframe; |
fee55450 MN |
1543 | if (MSR_TM_ACTIVE(msr_hi<<32)) { |
1544 | if (!cpu_has_feature(CPU_FTR_TM)) | |
1545 | goto badframe; | |
1546 | if (restore_tm_user_regs(regs, mcp, tm_mcp)) | |
1547 | goto badframe; | |
1548 | } else | |
1549 | #endif | |
1550 | { | |
1551 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); | |
1552 | addr = sr; | |
1553 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) | |
1554 | || restore_user_regs(regs, sr, 1)) | |
1555 | goto badframe; | |
1556 | } | |
1da177e4 | 1557 | |
401d1f02 | 1558 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1559 | return 0; |
1da177e4 LT |
1560 | |
1561 | badframe: | |
76462232 CD |
1562 | if (show_unhandled_signals) |
1563 | printk_ratelimited(KERN_INFO | |
1564 | "%s[%d]: bad frame in sys_sigreturn: " | |
1565 | "%p nip %08lx lr %08lx\n", | |
1566 | current->comm, current->pid, | |
1567 | addr, regs->nip, regs->link); | |
d0c3d534 | 1568 | |
1da177e4 LT |
1569 | force_sig(SIGSEGV, current); |
1570 | return 0; | |
1571 | } |