Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/signal.c | |
3 | * | |
ab72b007 | 4 | * Copyright (C) 1995-2009 Russell King |
1da177e4 LT |
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 version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
1da177e4 LT |
10 | #include <linux/errno.h> |
11 | #include <linux/signal.h> | |
1da177e4 | 12 | #include <linux/personality.h> |
7dfb7103 | 13 | #include <linux/freezer.h> |
33fa9b13 | 14 | #include <linux/uaccess.h> |
733e5e4b | 15 | #include <linux/tracehook.h> |
1da177e4 | 16 | |
ee90dabc | 17 | #include <asm/elf.h> |
1da177e4 LT |
18 | #include <asm/cacheflush.h> |
19 | #include <asm/ucontext.h> | |
1da177e4 | 20 | #include <asm/unistd.h> |
82c6f5a5 | 21 | #include <asm/vfp.h> |
1da177e4 | 22 | |
e00d349e | 23 | #include "signal.h" |
1da177e4 | 24 | |
1da177e4 LT |
25 | /* |
26 | * For ARM syscalls, we encode the syscall number into the instruction. | |
27 | */ | |
ee4cd588 | 28 | #define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE)) |
29 | #define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE)) | |
3b0c0622 | 30 | #define SWI_SYS_RESTART (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE) |
1da177e4 | 31 | |
fcca538b NP |
32 | /* |
33 | * With EABI, the syscall number has to be loaded into r7. | |
34 | */ | |
35 | #define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE)) | |
36 | #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) | |
37 | ||
1da177e4 LT |
38 | /* |
39 | * For Thumb syscalls, we pass the syscall number via r7. We therefore | |
40 | * need two 16-bit instructions. | |
41 | */ | |
42 | #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE)) | |
43 | #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) | |
44 | ||
fcca538b NP |
45 | const unsigned long sigreturn_codes[7] = { |
46 | MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, | |
47 | MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN, | |
1da177e4 LT |
48 | }; |
49 | ||
3b0c0622 WD |
50 | /* |
51 | * Either we support OABI only, or we have EABI with the OABI | |
52 | * compat layer enabled. In the later case we don't know if | |
53 | * user space is EABI or not, and if not we must not clobber r7. | |
54 | * Always using the OABI syscall solves that issue and works for | |
55 | * all those cases. | |
56 | */ | |
57 | const unsigned long syscall_restart_code[2] = { | |
58 | SWI_SYS_RESTART, /* swi __NR_restart_syscall */ | |
59 | 0xe49df004, /* ldr pc, [sp], #4 */ | |
60 | }; | |
61 | ||
1da177e4 LT |
62 | /* |
63 | * atomically swap in the new signal mask, and wait for a signal. | |
64 | */ | |
36984265 | 65 | asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask) |
1da177e4 | 66 | { |
101d9b0d | 67 | sigset_t blocked; |
101d9b0d | 68 | siginitset(&blocked, mask); |
68f3f16d | 69 | return sigsuspend(&blocked); |
1da177e4 LT |
70 | } |
71 | ||
72 | asmlinkage int | |
73 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
74 | struct old_sigaction __user *oact) | |
75 | { | |
76 | struct k_sigaction new_ka, old_ka; | |
77 | int ret; | |
78 | ||
79 | if (act) { | |
80 | old_sigset_t mask; | |
81 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
82 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
7f1b5a99 AV |
83 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
84 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
85 | __get_user(mask, &act->sa_mask)) | |
1da177e4 | 86 | return -EFAULT; |
1da177e4 LT |
87 | siginitset(&new_ka.sa.sa_mask, mask); |
88 | } | |
89 | ||
90 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
91 | ||
92 | if (!ret && oact) { | |
93 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
94 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
7f1b5a99 AV |
95 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
96 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
97 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
1da177e4 | 98 | return -EFAULT; |
1da177e4 LT |
99 | } |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
3bec6ded | 104 | #ifdef CONFIG_CRUNCH |
65a5053b | 105 | static int preserve_crunch_context(struct crunch_sigframe __user *frame) |
3bec6ded LB |
106 | { |
107 | char kbuf[sizeof(*frame) + 8]; | |
108 | struct crunch_sigframe *kframe; | |
109 | ||
110 | /* the crunch context must be 64 bit aligned */ | |
111 | kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7); | |
112 | kframe->magic = CRUNCH_MAGIC; | |
113 | kframe->size = CRUNCH_STORAGE_SIZE; | |
114 | crunch_task_copy(current_thread_info(), &kframe->storage); | |
115 | return __copy_to_user(frame, kframe, sizeof(*frame)); | |
116 | } | |
117 | ||
65a5053b | 118 | static int restore_crunch_context(struct crunch_sigframe __user *frame) |
3bec6ded LB |
119 | { |
120 | char kbuf[sizeof(*frame) + 8]; | |
121 | struct crunch_sigframe *kframe; | |
122 | ||
123 | /* the crunch context must be 64 bit aligned */ | |
124 | kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7); | |
125 | if (__copy_from_user(kframe, frame, sizeof(*frame))) | |
126 | return -1; | |
127 | if (kframe->magic != CRUNCH_MAGIC || | |
128 | kframe->size != CRUNCH_STORAGE_SIZE) | |
129 | return -1; | |
130 | crunch_task_restore(current_thread_info(), &kframe->storage); | |
131 | return 0; | |
132 | } | |
133 | #endif | |
134 | ||
1da177e4 LT |
135 | #ifdef CONFIG_IWMMXT |
136 | ||
1da177e4 LT |
137 | static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame) |
138 | { | |
69b04754 HD |
139 | char kbuf[sizeof(*frame) + 8]; |
140 | struct iwmmxt_sigframe *kframe; | |
1da177e4 LT |
141 | |
142 | /* the iWMMXt context must be 64 bit aligned */ | |
69b04754 | 143 | kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); |
85fe0681 DJ |
144 | kframe->magic = IWMMXT_MAGIC; |
145 | kframe->size = IWMMXT_STORAGE_SIZE; | |
69b04754 HD |
146 | iwmmxt_task_copy(current_thread_info(), &kframe->storage); |
147 | return __copy_to_user(frame, kframe, sizeof(*frame)); | |
1da177e4 LT |
148 | } |
149 | ||
150 | static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame) | |
151 | { | |
69b04754 HD |
152 | char kbuf[sizeof(*frame) + 8]; |
153 | struct iwmmxt_sigframe *kframe; | |
154 | ||
155 | /* the iWMMXt context must be 64 bit aligned */ | |
156 | kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); | |
157 | if (__copy_from_user(kframe, frame, sizeof(*frame))) | |
158 | return -1; | |
85fe0681 DJ |
159 | if (kframe->magic != IWMMXT_MAGIC || |
160 | kframe->size != IWMMXT_STORAGE_SIZE) | |
69b04754 HD |
161 | return -1; |
162 | iwmmxt_task_restore(current_thread_info(), &kframe->storage); | |
163 | return 0; | |
1da177e4 LT |
164 | } |
165 | ||
166 | #endif | |
167 | ||
82c6f5a5 ID |
168 | #ifdef CONFIG_VFP |
169 | ||
170 | static int preserve_vfp_context(struct vfp_sigframe __user *frame) | |
171 | { | |
82c6f5a5 ID |
172 | const unsigned long magic = VFP_MAGIC; |
173 | const unsigned long size = VFP_STORAGE_SIZE; | |
174 | int err = 0; | |
175 | ||
82c6f5a5 ID |
176 | __put_user_error(magic, &frame->magic, err); |
177 | __put_user_error(size, &frame->size, err); | |
178 | ||
2498814f WD |
179 | if (err) |
180 | return -EFAULT; | |
181 | ||
182 | return vfp_preserve_user_clear_hwstate(&frame->ufp, &frame->ufp_exc); | |
82c6f5a5 ID |
183 | } |
184 | ||
185 | static int restore_vfp_context(struct vfp_sigframe __user *frame) | |
186 | { | |
82c6f5a5 ID |
187 | unsigned long magic; |
188 | unsigned long size; | |
82c6f5a5 ID |
189 | int err = 0; |
190 | ||
191 | __get_user_error(magic, &frame->magic, err); | |
192 | __get_user_error(size, &frame->size, err); | |
193 | ||
194 | if (err) | |
195 | return -EFAULT; | |
196 | if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE) | |
197 | return -EINVAL; | |
198 | ||
2498814f | 199 | return vfp_restore_user_hwstate(&frame->ufp, &frame->ufp_exc); |
82c6f5a5 ID |
200 | } |
201 | ||
202 | #endif | |
203 | ||
1da177e4 LT |
204 | /* |
205 | * Do a signal return; undo the signal stack. These are aligned to 64-bit. | |
206 | */ | |
207 | struct sigframe { | |
7d4fdc19 | 208 | struct ucontext uc; |
fcca538b | 209 | unsigned long retcode[2]; |
1da177e4 LT |
210 | }; |
211 | ||
212 | struct rt_sigframe { | |
1da177e4 | 213 | struct siginfo info; |
cb3504e8 | 214 | struct sigframe sig; |
1da177e4 LT |
215 | }; |
216 | ||
68071484 | 217 | static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf) |
1da177e4 | 218 | { |
85fe0681 | 219 | struct aux_sigframe __user *aux; |
68071484 RK |
220 | sigset_t set; |
221 | int err; | |
222 | ||
223 | err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set)); | |
77097ae5 | 224 | if (err == 0) |
101d9b0d | 225 | set_current_blocked(&set); |
1da177e4 | 226 | |
68071484 RK |
227 | __get_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err); |
228 | __get_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err); | |
229 | __get_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err); | |
230 | __get_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err); | |
231 | __get_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err); | |
232 | __get_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err); | |
233 | __get_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err); | |
234 | __get_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err); | |
235 | __get_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err); | |
236 | __get_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err); | |
237 | __get_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err); | |
238 | __get_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err); | |
239 | __get_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err); | |
240 | __get_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
241 | __get_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
242 | __get_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err); | |
243 | __get_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err); | |
1da177e4 LT |
244 | |
245 | err |= !valid_user_regs(regs); | |
246 | ||
85fe0681 | 247 | aux = (struct aux_sigframe __user *) sf->uc.uc_regspace; |
3bec6ded LB |
248 | #ifdef CONFIG_CRUNCH |
249 | if (err == 0) | |
250 | err |= restore_crunch_context(&aux->crunch); | |
251 | #endif | |
1da177e4 LT |
252 | #ifdef CONFIG_IWMMXT |
253 | if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) | |
254 | err |= restore_iwmmxt_context(&aux->iwmmxt); | |
255 | #endif | |
256 | #ifdef CONFIG_VFP | |
82c6f5a5 ID |
257 | if (err == 0) |
258 | err |= restore_vfp_context(&aux->vfp); | |
1da177e4 LT |
259 | #endif |
260 | ||
261 | return err; | |
262 | } | |
263 | ||
264 | asmlinkage int sys_sigreturn(struct pt_regs *regs) | |
265 | { | |
266 | struct sigframe __user *frame; | |
1da177e4 LT |
267 | |
268 | /* Always make any pending restarted system calls return -EINTR */ | |
269 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
270 | ||
271 | /* | |
272 | * Since we stacked the signal on a 64-bit boundary, | |
273 | * then 'sp' should be word aligned here. If it's | |
274 | * not, then the user is trying to mess with us. | |
275 | */ | |
276 | if (regs->ARM_sp & 7) | |
277 | goto badframe; | |
278 | ||
279 | frame = (struct sigframe __user *)regs->ARM_sp; | |
280 | ||
281 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
282 | goto badframe; | |
1da177e4 | 283 | |
68071484 | 284 | if (restore_sigframe(regs, frame)) |
1da177e4 LT |
285 | goto badframe; |
286 | ||
1da177e4 LT |
287 | return regs->ARM_r0; |
288 | ||
289 | badframe: | |
290 | force_sig(SIGSEGV, current); | |
291 | return 0; | |
292 | } | |
293 | ||
294 | asmlinkage int sys_rt_sigreturn(struct pt_regs *regs) | |
295 | { | |
296 | struct rt_sigframe __user *frame; | |
1da177e4 LT |
297 | |
298 | /* Always make any pending restarted system calls return -EINTR */ | |
299 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
300 | ||
301 | /* | |
302 | * Since we stacked the signal on a 64-bit boundary, | |
303 | * then 'sp' should be word aligned here. If it's | |
304 | * not, then the user is trying to mess with us. | |
305 | */ | |
306 | if (regs->ARM_sp & 7) | |
307 | goto badframe; | |
308 | ||
309 | frame = (struct rt_sigframe __user *)regs->ARM_sp; | |
310 | ||
311 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
312 | goto badframe; | |
1da177e4 | 313 | |
68071484 | 314 | if (restore_sigframe(regs, &frame->sig)) |
1da177e4 LT |
315 | goto badframe; |
316 | ||
cb3504e8 | 317 | if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT) |
1da177e4 LT |
318 | goto badframe; |
319 | ||
1da177e4 LT |
320 | return regs->ARM_r0; |
321 | ||
322 | badframe: | |
323 | force_sig(SIGSEGV, current); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static int | |
aca6ca10 | 328 | setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set) |
1da177e4 | 329 | { |
85fe0681 | 330 | struct aux_sigframe __user *aux; |
1da177e4 LT |
331 | int err = 0; |
332 | ||
aca6ca10 RK |
333 | __put_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err); |
334 | __put_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err); | |
335 | __put_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err); | |
336 | __put_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err); | |
337 | __put_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err); | |
338 | __put_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err); | |
339 | __put_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err); | |
340 | __put_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err); | |
341 | __put_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err); | |
342 | __put_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err); | |
343 | __put_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err); | |
344 | __put_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err); | |
345 | __put_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err); | |
346 | __put_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
347 | __put_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
348 | __put_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err); | |
349 | __put_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err); | |
350 | ||
351 | __put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no, err); | |
352 | __put_user_error(current->thread.error_code, &sf->uc.uc_mcontext.error_code, err); | |
353 | __put_user_error(current->thread.address, &sf->uc.uc_mcontext.fault_address, err); | |
354 | __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); | |
355 | ||
356 | err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set)); | |
1da177e4 | 357 | |
85fe0681 | 358 | aux = (struct aux_sigframe __user *) sf->uc.uc_regspace; |
3bec6ded LB |
359 | #ifdef CONFIG_CRUNCH |
360 | if (err == 0) | |
361 | err |= preserve_crunch_context(&aux->crunch); | |
362 | #endif | |
1da177e4 LT |
363 | #ifdef CONFIG_IWMMXT |
364 | if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) | |
365 | err |= preserve_iwmmxt_context(&aux->iwmmxt); | |
366 | #endif | |
367 | #ifdef CONFIG_VFP | |
82c6f5a5 ID |
368 | if (err == 0) |
369 | err |= preserve_vfp_context(&aux->vfp); | |
1da177e4 | 370 | #endif |
85fe0681 | 371 | __put_user_error(0, &aux->end_magic, err); |
1da177e4 LT |
372 | |
373 | return err; | |
374 | } | |
375 | ||
376 | static inline void __user * | |
377 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize) | |
378 | { | |
379 | unsigned long sp = regs->ARM_sp; | |
380 | void __user *frame; | |
381 | ||
382 | /* | |
383 | * This is the X/Open sanctioned signal stack switching. | |
384 | */ | |
385 | if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) | |
386 | sp = current->sas_ss_sp + current->sas_ss_size; | |
387 | ||
388 | /* | |
389 | * ATPCS B01 mandates 8-byte alignment | |
390 | */ | |
391 | frame = (void __user *)((sp - framesize) & ~7); | |
392 | ||
393 | /* | |
394 | * Check that we can actually write to the signal frame. | |
395 | */ | |
396 | if (!access_ok(VERIFY_WRITE, frame, framesize)) | |
397 | frame = NULL; | |
398 | ||
399 | return frame; | |
400 | } | |
401 | ||
402 | static int | |
403 | setup_return(struct pt_regs *regs, struct k_sigaction *ka, | |
404 | unsigned long __user *rc, void __user *frame, int usig) | |
405 | { | |
406 | unsigned long handler = (unsigned long)ka->sa.sa_handler; | |
407 | unsigned long retcode; | |
408 | int thumb = 0; | |
53399053 RK |
409 | unsigned long cpsr = regs->ARM_cpsr & ~(PSR_f | PSR_E_BIT); |
410 | ||
411 | cpsr |= PSR_ENDSTATE; | |
1da177e4 LT |
412 | |
413 | /* | |
414 | * Maybe we need to deliver a 32-bit signal to a 26-bit task. | |
415 | */ | |
416 | if (ka->sa.sa_flags & SA_THIRTYTWO) | |
417 | cpsr = (cpsr & ~MODE_MASK) | USR_MODE; | |
418 | ||
419 | #ifdef CONFIG_ARM_THUMB | |
420 | if (elf_hwcap & HWCAP_THUMB) { | |
421 | /* | |
422 | * The LSB of the handler determines if we're going to | |
423 | * be using THUMB or ARM mode for this signal handler. | |
424 | */ | |
425 | thumb = handler & 1; | |
426 | ||
d71e1352 | 427 | if (thumb) { |
1da177e4 | 428 | cpsr |= PSR_T_BIT; |
d71e1352 CM |
429 | #if __LINUX_ARM_ARCH__ >= 7 |
430 | /* clear the If-Then Thumb-2 execution state */ | |
431 | cpsr &= ~PSR_IT_MASK; | |
432 | #endif | |
433 | } else | |
1da177e4 LT |
434 | cpsr &= ~PSR_T_BIT; |
435 | } | |
436 | #endif | |
437 | ||
438 | if (ka->sa.sa_flags & SA_RESTORER) { | |
439 | retcode = (unsigned long)ka->sa.sa_restorer; | |
440 | } else { | |
fcca538b | 441 | unsigned int idx = thumb << 1; |
1da177e4 LT |
442 | |
443 | if (ka->sa.sa_flags & SA_SIGINFO) | |
fcca538b | 444 | idx += 3; |
1da177e4 | 445 | |
fcca538b NP |
446 | if (__put_user(sigreturn_codes[idx], rc) || |
447 | __put_user(sigreturn_codes[idx+1], rc+1)) | |
1da177e4 LT |
448 | return 1; |
449 | ||
e00d349e RK |
450 | if (cpsr & MODE32_BIT) { |
451 | /* | |
452 | * 32-bit code can use the new high-page | |
453 | * signal return code support. | |
454 | */ | |
455 | retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb; | |
456 | } else { | |
457 | /* | |
458 | * Ensure that the instruction cache sees | |
459 | * the return code written onto the stack. | |
460 | */ | |
461 | flush_icache_range((unsigned long)rc, | |
fcca538b | 462 | (unsigned long)(rc + 2)); |
e00d349e RK |
463 | |
464 | retcode = ((unsigned long)rc) + thumb; | |
465 | } | |
1da177e4 LT |
466 | } |
467 | ||
468 | regs->ARM_r0 = usig; | |
469 | regs->ARM_sp = (unsigned long)frame; | |
470 | regs->ARM_lr = retcode; | |
471 | regs->ARM_pc = handler; | |
472 | regs->ARM_cpsr = cpsr; | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | static int | |
478 | setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs) | |
479 | { | |
480 | struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); | |
481 | int err = 0; | |
482 | ||
483 | if (!frame) | |
484 | return 1; | |
485 | ||
ca195cfe RK |
486 | /* |
487 | * Set uc.uc_flags to a value which sc.trap_no would never have. | |
488 | */ | |
489 | __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); | |
1da177e4 | 490 | |
aca6ca10 | 491 | err |= setup_sigframe(frame, regs, set); |
1da177e4 | 492 | if (err == 0) |
fcca538b | 493 | err = setup_return(regs, ka, frame->retcode, frame, usig); |
1da177e4 LT |
494 | |
495 | return err; | |
496 | } | |
497 | ||
498 | static int | |
499 | setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, | |
500 | sigset_t *set, struct pt_regs *regs) | |
501 | { | |
502 | struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); | |
503 | stack_t stack; | |
504 | int err = 0; | |
505 | ||
506 | if (!frame) | |
507 | return 1; | |
508 | ||
1da177e4 LT |
509 | err |= copy_siginfo_to_user(&frame->info, info); |
510 | ||
cb3504e8 RK |
511 | __put_user_error(0, &frame->sig.uc.uc_flags, err); |
512 | __put_user_error(NULL, &frame->sig.uc.uc_link, err); | |
1da177e4 LT |
513 | |
514 | memset(&stack, 0, sizeof(stack)); | |
515 | stack.ss_sp = (void __user *)current->sas_ss_sp; | |
516 | stack.ss_flags = sas_ss_flags(regs->ARM_sp); | |
517 | stack.ss_size = current->sas_ss_size; | |
cb3504e8 | 518 | err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); |
1da177e4 | 519 | |
aca6ca10 | 520 | err |= setup_sigframe(&frame->sig, regs, set); |
1da177e4 | 521 | if (err == 0) |
cb3504e8 | 522 | err = setup_return(regs, ka, frame->sig.retcode, frame, usig); |
1da177e4 LT |
523 | |
524 | if (err == 0) { | |
525 | /* | |
526 | * For realtime signals we must also set the second and third | |
527 | * arguments for the signal handler. | |
528 | * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06 | |
529 | */ | |
530 | regs->ARM_r1 = (unsigned long)&frame->info; | |
cb3504e8 | 531 | regs->ARM_r2 = (unsigned long)&frame->sig.uc; |
1da177e4 LT |
532 | } |
533 | ||
534 | return err; | |
535 | } | |
536 | ||
1da177e4 LT |
537 | /* |
538 | * OK, we're invoking a handler | |
539 | */ | |
a610d6e6 | 540 | static void |
1da177e4 | 541 | handle_signal(unsigned long sig, struct k_sigaction *ka, |
b7f9a11a | 542 | siginfo_t *info, struct pt_regs *regs) |
1da177e4 LT |
543 | { |
544 | struct thread_info *thread = current_thread_info(); | |
545 | struct task_struct *tsk = current; | |
b7f9a11a | 546 | sigset_t *oldset = sigmask_to_save(); |
1da177e4 LT |
547 | int usig = sig; |
548 | int ret; | |
549 | ||
1da177e4 LT |
550 | /* |
551 | * translate the signal | |
552 | */ | |
553 | if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap) | |
554 | usig = thread->exec_domain->signal_invmap[usig]; | |
555 | ||
556 | /* | |
557 | * Set up the stack frame | |
558 | */ | |
559 | if (ka->sa.sa_flags & SA_SIGINFO) | |
560 | ret = setup_rt_frame(usig, ka, info, oldset, regs); | |
561 | else | |
562 | ret = setup_frame(usig, ka, oldset, regs); | |
563 | ||
564 | /* | |
565 | * Check that the resulting registers are actually sane. | |
566 | */ | |
567 | ret |= !valid_user_regs(regs); | |
568 | ||
69be8f18 | 569 | if (ret != 0) { |
a6c61e9d | 570 | force_sigsegv(sig, tsk); |
a610d6e6 | 571 | return; |
1da177e4 | 572 | } |
efee984c | 573 | signal_delivered(sig, info, ka, regs, 0); |
1da177e4 LT |
574 | } |
575 | ||
576 | /* | |
577 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
578 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
579 | * mistake. | |
580 | * | |
581 | * Note that we go through the signals twice: once to check the signals that | |
582 | * the kernel can handle, and then we build all the user-level signal handling | |
583 | * stack-frames in one go after that. | |
584 | */ | |
36984265 | 585 | static void do_signal(struct pt_regs *regs, int syscall) |
1da177e4 | 586 | { |
2af68df0 | 587 | unsigned int retval = 0, continue_addr = 0, restart_addr = 0; |
1da177e4 LT |
588 | struct k_sigaction ka; |
589 | siginfo_t info; | |
590 | int signr; | |
591 | ||
2af68df0 AB |
592 | /* |
593 | * If we were from a system call, check for system call restarting... | |
594 | */ | |
595 | if (syscall) { | |
596 | continue_addr = regs->ARM_pc; | |
597 | restart_addr = continue_addr - (thumb_mode(regs) ? 2 : 4); | |
598 | retval = regs->ARM_r0; | |
599 | ||
600 | /* | |
601 | * Prepare for system call restart. We do this here so that a | |
602 | * debugger will see the already changed PSW. | |
603 | */ | |
604 | switch (retval) { | |
605 | case -ERESTARTNOHAND: | |
606 | case -ERESTARTSYS: | |
607 | case -ERESTARTNOINTR: | |
608 | regs->ARM_r0 = regs->ARM_ORIG_r0; | |
609 | regs->ARM_pc = restart_addr; | |
610 | break; | |
433e2f30 WD |
611 | case -ERESTART_RESTARTBLOCK: |
612 | regs->ARM_r0 = -EINTR; | |
613 | break; | |
2af68df0 AB |
614 | } |
615 | } | |
616 | ||
2af68df0 AB |
617 | /* |
618 | * Get the signal to deliver. When running under ptrace, at this | |
619 | * point the debugger may change all our registers ... | |
620 | */ | |
1da177e4 LT |
621 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
622 | if (signr > 0) { | |
2af68df0 AB |
623 | /* |
624 | * Depending on the signal settings we may need to revert the | |
625 | * decision to restart the system call. But skip this if a | |
626 | * debugger has chosen to restart at a different PC. | |
627 | */ | |
628 | if (regs->ARM_pc == restart_addr) { | |
433e2f30 | 629 | if (retval == -ERESTARTNOHAND |
2af68df0 AB |
630 | || (retval == -ERESTARTSYS |
631 | && !(ka.sa.sa_flags & SA_RESTART))) { | |
632 | regs->ARM_r0 = -EINTR; | |
633 | regs->ARM_pc = continue_addr; | |
634 | } | |
635 | } | |
636 | ||
a610d6e6 | 637 | handle_signal(signr, &ka, &info, regs); |
36984265 | 638 | return; |
1da177e4 LT |
639 | } |
640 | ||
1da177e4 | 641 | if (syscall) { |
2af68df0 AB |
642 | /* |
643 | * Handle restarting a different system call. As above, | |
644 | * if a debugger has chosen to restart at a different PC, | |
645 | * ignore the restart. | |
646 | */ | |
647 | if (retval == -ERESTART_RESTARTBLOCK | |
433e2f30 WD |
648 | && regs->ARM_pc == continue_addr) { |
649 | if (thumb_mode(regs)) { | |
650 | regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE; | |
651 | regs->ARM_pc -= 2; | |
652 | } else { | |
653 | #if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT) | |
654 | regs->ARM_r7 = __NR_restart_syscall; | |
655 | regs->ARM_pc -= 4; | |
656 | #else | |
657 | u32 __user *usp; | |
658 | ||
659 | regs->ARM_sp -= 4; | |
660 | usp = (u32 __user *)regs->ARM_sp; | |
661 | ||
662 | if (put_user(regs->ARM_pc, usp) == 0) { | |
663 | regs->ARM_pc = KERN_RESTART_CODE; | |
664 | } else { | |
665 | regs->ARM_sp += 4; | |
666 | force_sigsegv(0, current); | |
667 | } | |
668 | #endif | |
669 | } | |
670 | } | |
1da177e4 | 671 | } |
7dfae720 | 672 | |
51a7b448 | 673 | restore_saved_sigmask(); |
1da177e4 LT |
674 | } |
675 | ||
676 | asmlinkage void | |
677 | do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall) | |
678 | { | |
679 | if (thread_flags & _TIF_SIGPENDING) | |
36984265 | 680 | do_signal(regs, syscall); |
d0420c83 DH |
681 | |
682 | if (thread_flags & _TIF_NOTIFY_RESUME) { | |
683 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
684 | tracehook_notify_resume(regs); | |
685 | } | |
1da177e4 | 686 | } |