Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/signal.c | |
3 | * | |
4 | * Copyright (C) 1995-2002 Russell King | |
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 LT |
20 | #include <asm/unistd.h> |
21 | ||
22 | #include "ptrace.h" | |
e00d349e | 23 | #include "signal.h" |
1da177e4 LT |
24 | |
25 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
26 | ||
27 | /* | |
28 | * For ARM syscalls, we encode the syscall number into the instruction. | |
29 | */ | |
ee4cd588 | 30 | #define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE)) |
31 | #define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE)) | |
1da177e4 | 32 | |
fcca538b NP |
33 | /* |
34 | * With EABI, the syscall number has to be loaded into r7. | |
35 | */ | |
36 | #define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE)) | |
37 | #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) | |
38 | ||
1da177e4 LT |
39 | /* |
40 | * For Thumb syscalls, we pass the syscall number via r7. We therefore | |
41 | * need two 16-bit instructions. | |
42 | */ | |
43 | #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE)) | |
44 | #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) | |
45 | ||
fcca538b NP |
46 | const unsigned long sigreturn_codes[7] = { |
47 | MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, | |
48 | MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN, | |
1da177e4 LT |
49 | }; |
50 | ||
1da177e4 LT |
51 | /* |
52 | * atomically swap in the new signal mask, and wait for a signal. | |
53 | */ | |
36984265 | 54 | asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask) |
1da177e4 | 55 | { |
1da177e4 LT |
56 | mask &= _BLOCKABLE; |
57 | spin_lock_irq(¤t->sighand->siglock); | |
36984265 | 58 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
59 | siginitset(¤t->blocked, mask); |
60 | recalc_sigpending(); | |
61 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 | 62 | |
36984265 MP |
63 | current->state = TASK_INTERRUPTIBLE; |
64 | schedule(); | |
65 | set_restore_sigmask(); | |
66 | return -ERESTARTNOHAND; | |
1da177e4 LT |
67 | } |
68 | ||
69 | asmlinkage int | |
70 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
71 | struct old_sigaction __user *oact) | |
72 | { | |
73 | struct k_sigaction new_ka, old_ka; | |
74 | int ret; | |
75 | ||
76 | if (act) { | |
77 | old_sigset_t mask; | |
78 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
79 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
80 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
81 | return -EFAULT; | |
82 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
83 | __get_user(mask, &act->sa_mask); | |
84 | siginitset(&new_ka.sa.sa_mask, mask); | |
85 | } | |
86 | ||
87 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
88 | ||
89 | if (!ret && oact) { | |
90 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
91 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
92 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
93 | return -EFAULT; | |
94 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
95 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
96 | } | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
3bec6ded | 101 | #ifdef CONFIG_CRUNCH |
65a5053b | 102 | static int preserve_crunch_context(struct crunch_sigframe __user *frame) |
3bec6ded LB |
103 | { |
104 | char kbuf[sizeof(*frame) + 8]; | |
105 | struct crunch_sigframe *kframe; | |
106 | ||
107 | /* the crunch context must be 64 bit aligned */ | |
108 | kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7); | |
109 | kframe->magic = CRUNCH_MAGIC; | |
110 | kframe->size = CRUNCH_STORAGE_SIZE; | |
111 | crunch_task_copy(current_thread_info(), &kframe->storage); | |
112 | return __copy_to_user(frame, kframe, sizeof(*frame)); | |
113 | } | |
114 | ||
65a5053b | 115 | static int restore_crunch_context(struct crunch_sigframe __user *frame) |
3bec6ded LB |
116 | { |
117 | char kbuf[sizeof(*frame) + 8]; | |
118 | struct crunch_sigframe *kframe; | |
119 | ||
120 | /* the crunch context must be 64 bit aligned */ | |
121 | kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7); | |
122 | if (__copy_from_user(kframe, frame, sizeof(*frame))) | |
123 | return -1; | |
124 | if (kframe->magic != CRUNCH_MAGIC || | |
125 | kframe->size != CRUNCH_STORAGE_SIZE) | |
126 | return -1; | |
127 | crunch_task_restore(current_thread_info(), &kframe->storage); | |
128 | return 0; | |
129 | } | |
130 | #endif | |
131 | ||
1da177e4 LT |
132 | #ifdef CONFIG_IWMMXT |
133 | ||
1da177e4 LT |
134 | static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame) |
135 | { | |
69b04754 HD |
136 | char kbuf[sizeof(*frame) + 8]; |
137 | struct iwmmxt_sigframe *kframe; | |
1da177e4 LT |
138 | |
139 | /* the iWMMXt context must be 64 bit aligned */ | |
69b04754 | 140 | kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); |
85fe0681 DJ |
141 | kframe->magic = IWMMXT_MAGIC; |
142 | kframe->size = IWMMXT_STORAGE_SIZE; | |
69b04754 HD |
143 | iwmmxt_task_copy(current_thread_info(), &kframe->storage); |
144 | return __copy_to_user(frame, kframe, sizeof(*frame)); | |
1da177e4 LT |
145 | } |
146 | ||
147 | static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame) | |
148 | { | |
69b04754 HD |
149 | char kbuf[sizeof(*frame) + 8]; |
150 | struct iwmmxt_sigframe *kframe; | |
151 | ||
152 | /* the iWMMXt context must be 64 bit aligned */ | |
153 | kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); | |
154 | if (__copy_from_user(kframe, frame, sizeof(*frame))) | |
155 | return -1; | |
85fe0681 DJ |
156 | if (kframe->magic != IWMMXT_MAGIC || |
157 | kframe->size != IWMMXT_STORAGE_SIZE) | |
69b04754 HD |
158 | return -1; |
159 | iwmmxt_task_restore(current_thread_info(), &kframe->storage); | |
160 | return 0; | |
1da177e4 LT |
161 | } |
162 | ||
163 | #endif | |
164 | ||
1da177e4 LT |
165 | /* |
166 | * Do a signal return; undo the signal stack. These are aligned to 64-bit. | |
167 | */ | |
168 | struct sigframe { | |
7d4fdc19 | 169 | struct ucontext uc; |
fcca538b | 170 | unsigned long retcode[2]; |
1da177e4 LT |
171 | }; |
172 | ||
173 | struct rt_sigframe { | |
1da177e4 | 174 | struct siginfo info; |
cb3504e8 | 175 | struct sigframe sig; |
1da177e4 LT |
176 | }; |
177 | ||
68071484 | 178 | static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf) |
1da177e4 | 179 | { |
85fe0681 | 180 | struct aux_sigframe __user *aux; |
68071484 RK |
181 | sigset_t set; |
182 | int err; | |
183 | ||
184 | err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set)); | |
185 | if (err == 0) { | |
186 | sigdelsetmask(&set, ~_BLOCKABLE); | |
187 | spin_lock_irq(¤t->sighand->siglock); | |
188 | current->blocked = set; | |
189 | recalc_sigpending(); | |
190 | spin_unlock_irq(¤t->sighand->siglock); | |
191 | } | |
1da177e4 | 192 | |
68071484 RK |
193 | __get_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err); |
194 | __get_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err); | |
195 | __get_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err); | |
196 | __get_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err); | |
197 | __get_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err); | |
198 | __get_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err); | |
199 | __get_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err); | |
200 | __get_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err); | |
201 | __get_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err); | |
202 | __get_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err); | |
203 | __get_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err); | |
204 | __get_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err); | |
205 | __get_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err); | |
206 | __get_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
207 | __get_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
208 | __get_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err); | |
209 | __get_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err); | |
1da177e4 LT |
210 | |
211 | err |= !valid_user_regs(regs); | |
212 | ||
85fe0681 | 213 | aux = (struct aux_sigframe __user *) sf->uc.uc_regspace; |
3bec6ded LB |
214 | #ifdef CONFIG_CRUNCH |
215 | if (err == 0) | |
216 | err |= restore_crunch_context(&aux->crunch); | |
217 | #endif | |
1da177e4 LT |
218 | #ifdef CONFIG_IWMMXT |
219 | if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) | |
220 | err |= restore_iwmmxt_context(&aux->iwmmxt); | |
221 | #endif | |
222 | #ifdef CONFIG_VFP | |
223 | // if (err == 0) | |
68071484 | 224 | // err |= vfp_restore_state(&sf->aux.vfp); |
1da177e4 LT |
225 | #endif |
226 | ||
227 | return err; | |
228 | } | |
229 | ||
230 | asmlinkage int sys_sigreturn(struct pt_regs *regs) | |
231 | { | |
232 | struct sigframe __user *frame; | |
1da177e4 LT |
233 | |
234 | /* Always make any pending restarted system calls return -EINTR */ | |
235 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
236 | ||
237 | /* | |
238 | * Since we stacked the signal on a 64-bit boundary, | |
239 | * then 'sp' should be word aligned here. If it's | |
240 | * not, then the user is trying to mess with us. | |
241 | */ | |
242 | if (regs->ARM_sp & 7) | |
243 | goto badframe; | |
244 | ||
245 | frame = (struct sigframe __user *)regs->ARM_sp; | |
246 | ||
247 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
248 | goto badframe; | |
1da177e4 | 249 | |
68071484 | 250 | if (restore_sigframe(regs, frame)) |
1da177e4 LT |
251 | goto badframe; |
252 | ||
b2a0d36f | 253 | single_step_trap(current); |
1da177e4 LT |
254 | |
255 | return regs->ARM_r0; | |
256 | ||
257 | badframe: | |
258 | force_sig(SIGSEGV, current); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | asmlinkage int sys_rt_sigreturn(struct pt_regs *regs) | |
263 | { | |
264 | struct rt_sigframe __user *frame; | |
1da177e4 LT |
265 | |
266 | /* Always make any pending restarted system calls return -EINTR */ | |
267 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
268 | ||
269 | /* | |
270 | * Since we stacked the signal on a 64-bit boundary, | |
271 | * then 'sp' should be word aligned here. If it's | |
272 | * not, then the user is trying to mess with us. | |
273 | */ | |
274 | if (regs->ARM_sp & 7) | |
275 | goto badframe; | |
276 | ||
277 | frame = (struct rt_sigframe __user *)regs->ARM_sp; | |
278 | ||
279 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
280 | goto badframe; | |
1da177e4 | 281 | |
68071484 | 282 | if (restore_sigframe(regs, &frame->sig)) |
1da177e4 LT |
283 | goto badframe; |
284 | ||
cb3504e8 | 285 | if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT) |
1da177e4 LT |
286 | goto badframe; |
287 | ||
b2a0d36f | 288 | single_step_trap(current); |
1da177e4 LT |
289 | |
290 | return regs->ARM_r0; | |
291 | ||
292 | badframe: | |
293 | force_sig(SIGSEGV, current); | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static int | |
aca6ca10 | 298 | setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set) |
1da177e4 | 299 | { |
85fe0681 | 300 | struct aux_sigframe __user *aux; |
1da177e4 LT |
301 | int err = 0; |
302 | ||
aca6ca10 RK |
303 | __put_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err); |
304 | __put_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err); | |
305 | __put_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err); | |
306 | __put_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err); | |
307 | __put_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err); | |
308 | __put_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err); | |
309 | __put_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err); | |
310 | __put_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err); | |
311 | __put_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err); | |
312 | __put_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err); | |
313 | __put_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err); | |
314 | __put_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err); | |
315 | __put_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err); | |
316 | __put_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
317 | __put_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
318 | __put_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err); | |
319 | __put_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err); | |
320 | ||
321 | __put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no, err); | |
322 | __put_user_error(current->thread.error_code, &sf->uc.uc_mcontext.error_code, err); | |
323 | __put_user_error(current->thread.address, &sf->uc.uc_mcontext.fault_address, err); | |
324 | __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); | |
325 | ||
326 | err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set)); | |
1da177e4 | 327 | |
85fe0681 | 328 | aux = (struct aux_sigframe __user *) sf->uc.uc_regspace; |
3bec6ded LB |
329 | #ifdef CONFIG_CRUNCH |
330 | if (err == 0) | |
331 | err |= preserve_crunch_context(&aux->crunch); | |
332 | #endif | |
1da177e4 LT |
333 | #ifdef CONFIG_IWMMXT |
334 | if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) | |
335 | err |= preserve_iwmmxt_context(&aux->iwmmxt); | |
336 | #endif | |
337 | #ifdef CONFIG_VFP | |
338 | // if (err == 0) | |
aca6ca10 | 339 | // err |= vfp_save_state(&sf->aux.vfp); |
1da177e4 | 340 | #endif |
85fe0681 | 341 | __put_user_error(0, &aux->end_magic, err); |
1da177e4 LT |
342 | |
343 | return err; | |
344 | } | |
345 | ||
346 | static inline void __user * | |
347 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize) | |
348 | { | |
349 | unsigned long sp = regs->ARM_sp; | |
350 | void __user *frame; | |
351 | ||
352 | /* | |
353 | * This is the X/Open sanctioned signal stack switching. | |
354 | */ | |
355 | if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) | |
356 | sp = current->sas_ss_sp + current->sas_ss_size; | |
357 | ||
358 | /* | |
359 | * ATPCS B01 mandates 8-byte alignment | |
360 | */ | |
361 | frame = (void __user *)((sp - framesize) & ~7); | |
362 | ||
363 | /* | |
364 | * Check that we can actually write to the signal frame. | |
365 | */ | |
366 | if (!access_ok(VERIFY_WRITE, frame, framesize)) | |
367 | frame = NULL; | |
368 | ||
369 | return frame; | |
370 | } | |
371 | ||
372 | static int | |
373 | setup_return(struct pt_regs *regs, struct k_sigaction *ka, | |
374 | unsigned long __user *rc, void __user *frame, int usig) | |
375 | { | |
376 | unsigned long handler = (unsigned long)ka->sa.sa_handler; | |
377 | unsigned long retcode; | |
378 | int thumb = 0; | |
379 | unsigned long cpsr = regs->ARM_cpsr & ~PSR_f; | |
380 | ||
381 | /* | |
382 | * Maybe we need to deliver a 32-bit signal to a 26-bit task. | |
383 | */ | |
384 | if (ka->sa.sa_flags & SA_THIRTYTWO) | |
385 | cpsr = (cpsr & ~MODE_MASK) | USR_MODE; | |
386 | ||
387 | #ifdef CONFIG_ARM_THUMB | |
388 | if (elf_hwcap & HWCAP_THUMB) { | |
389 | /* | |
390 | * The LSB of the handler determines if we're going to | |
391 | * be using THUMB or ARM mode for this signal handler. | |
392 | */ | |
393 | thumb = handler & 1; | |
394 | ||
d71e1352 | 395 | if (thumb) { |
1da177e4 | 396 | cpsr |= PSR_T_BIT; |
d71e1352 CM |
397 | #if __LINUX_ARM_ARCH__ >= 7 |
398 | /* clear the If-Then Thumb-2 execution state */ | |
399 | cpsr &= ~PSR_IT_MASK; | |
400 | #endif | |
401 | } else | |
1da177e4 LT |
402 | cpsr &= ~PSR_T_BIT; |
403 | } | |
404 | #endif | |
405 | ||
406 | if (ka->sa.sa_flags & SA_RESTORER) { | |
407 | retcode = (unsigned long)ka->sa.sa_restorer; | |
408 | } else { | |
fcca538b | 409 | unsigned int idx = thumb << 1; |
1da177e4 LT |
410 | |
411 | if (ka->sa.sa_flags & SA_SIGINFO) | |
fcca538b | 412 | idx += 3; |
1da177e4 | 413 | |
fcca538b NP |
414 | if (__put_user(sigreturn_codes[idx], rc) || |
415 | __put_user(sigreturn_codes[idx+1], rc+1)) | |
1da177e4 LT |
416 | return 1; |
417 | ||
e00d349e RK |
418 | if (cpsr & MODE32_BIT) { |
419 | /* | |
420 | * 32-bit code can use the new high-page | |
421 | * signal return code support. | |
422 | */ | |
423 | retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb; | |
424 | } else { | |
425 | /* | |
426 | * Ensure that the instruction cache sees | |
427 | * the return code written onto the stack. | |
428 | */ | |
429 | flush_icache_range((unsigned long)rc, | |
fcca538b | 430 | (unsigned long)(rc + 2)); |
e00d349e RK |
431 | |
432 | retcode = ((unsigned long)rc) + thumb; | |
433 | } | |
1da177e4 LT |
434 | } |
435 | ||
436 | regs->ARM_r0 = usig; | |
437 | regs->ARM_sp = (unsigned long)frame; | |
438 | regs->ARM_lr = retcode; | |
439 | regs->ARM_pc = handler; | |
440 | regs->ARM_cpsr = cpsr; | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | static int | |
446 | setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs) | |
447 | { | |
448 | struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); | |
449 | int err = 0; | |
450 | ||
451 | if (!frame) | |
452 | return 1; | |
453 | ||
ca195cfe RK |
454 | /* |
455 | * Set uc.uc_flags to a value which sc.trap_no would never have. | |
456 | */ | |
457 | __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); | |
1da177e4 | 458 | |
aca6ca10 | 459 | err |= setup_sigframe(frame, regs, set); |
1da177e4 | 460 | if (err == 0) |
fcca538b | 461 | err = setup_return(regs, ka, frame->retcode, frame, usig); |
1da177e4 LT |
462 | |
463 | return err; | |
464 | } | |
465 | ||
466 | static int | |
467 | setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, | |
468 | sigset_t *set, struct pt_regs *regs) | |
469 | { | |
470 | struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); | |
471 | stack_t stack; | |
472 | int err = 0; | |
473 | ||
474 | if (!frame) | |
475 | return 1; | |
476 | ||
1da177e4 LT |
477 | err |= copy_siginfo_to_user(&frame->info, info); |
478 | ||
cb3504e8 RK |
479 | __put_user_error(0, &frame->sig.uc.uc_flags, err); |
480 | __put_user_error(NULL, &frame->sig.uc.uc_link, err); | |
1da177e4 LT |
481 | |
482 | memset(&stack, 0, sizeof(stack)); | |
483 | stack.ss_sp = (void __user *)current->sas_ss_sp; | |
484 | stack.ss_flags = sas_ss_flags(regs->ARM_sp); | |
485 | stack.ss_size = current->sas_ss_size; | |
cb3504e8 | 486 | err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); |
1da177e4 | 487 | |
aca6ca10 | 488 | err |= setup_sigframe(&frame->sig, regs, set); |
1da177e4 | 489 | if (err == 0) |
cb3504e8 | 490 | err = setup_return(regs, ka, frame->sig.retcode, frame, usig); |
1da177e4 LT |
491 | |
492 | if (err == 0) { | |
493 | /* | |
494 | * For realtime signals we must also set the second and third | |
495 | * arguments for the signal handler. | |
496 | * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06 | |
497 | */ | |
498 | regs->ARM_r1 = (unsigned long)&frame->info; | |
cb3504e8 | 499 | regs->ARM_r2 = (unsigned long)&frame->sig.uc; |
1da177e4 LT |
500 | } |
501 | ||
502 | return err; | |
503 | } | |
504 | ||
288ddad5 | 505 | static inline void setup_syscall_restart(struct pt_regs *regs) |
1da177e4 LT |
506 | { |
507 | regs->ARM_r0 = regs->ARM_ORIG_r0; | |
508 | regs->ARM_pc -= thumb_mode(regs) ? 2 : 4; | |
509 | } | |
510 | ||
511 | /* | |
512 | * OK, we're invoking a handler | |
513 | */ | |
36984265 | 514 | static int |
1da177e4 LT |
515 | handle_signal(unsigned long sig, struct k_sigaction *ka, |
516 | siginfo_t *info, sigset_t *oldset, | |
517 | struct pt_regs * regs, int syscall) | |
518 | { | |
519 | struct thread_info *thread = current_thread_info(); | |
520 | struct task_struct *tsk = current; | |
521 | int usig = sig; | |
522 | int ret; | |
523 | ||
524 | /* | |
525 | * If we were from a system call, check for system call restarting... | |
526 | */ | |
527 | if (syscall) { | |
528 | switch (regs->ARM_r0) { | |
529 | case -ERESTART_RESTARTBLOCK: | |
530 | case -ERESTARTNOHAND: | |
531 | regs->ARM_r0 = -EINTR; | |
532 | break; | |
533 | case -ERESTARTSYS: | |
534 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
535 | regs->ARM_r0 = -EINTR; | |
536 | break; | |
537 | } | |
538 | /* fallthrough */ | |
539 | case -ERESTARTNOINTR: | |
288ddad5 | 540 | setup_syscall_restart(regs); |
1da177e4 LT |
541 | } |
542 | } | |
543 | ||
544 | /* | |
545 | * translate the signal | |
546 | */ | |
547 | if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap) | |
548 | usig = thread->exec_domain->signal_invmap[usig]; | |
549 | ||
550 | /* | |
551 | * Set up the stack frame | |
552 | */ | |
553 | if (ka->sa.sa_flags & SA_SIGINFO) | |
554 | ret = setup_rt_frame(usig, ka, info, oldset, regs); | |
555 | else | |
556 | ret = setup_frame(usig, ka, oldset, regs); | |
557 | ||
558 | /* | |
559 | * Check that the resulting registers are actually sane. | |
560 | */ | |
561 | ret |= !valid_user_regs(regs); | |
562 | ||
69be8f18 | 563 | if (ret != 0) { |
a6c61e9d | 564 | force_sigsegv(sig, tsk); |
36984265 | 565 | return ret; |
1da177e4 LT |
566 | } |
567 | ||
a6c61e9d DJ |
568 | /* |
569 | * Block the signal if we were successful. | |
570 | */ | |
571 | spin_lock_irq(&tsk->sighand->siglock); | |
572 | sigorsets(&tsk->blocked, &tsk->blocked, | |
573 | &ka->sa.sa_mask); | |
574 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
575 | sigaddset(&tsk->blocked, sig); | |
576 | recalc_sigpending(); | |
577 | spin_unlock_irq(&tsk->sighand->siglock); | |
1da177e4 | 578 | |
36984265 | 579 | return 0; |
1da177e4 LT |
580 | } |
581 | ||
582 | /* | |
583 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
584 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
585 | * mistake. | |
586 | * | |
587 | * Note that we go through the signals twice: once to check the signals that | |
588 | * the kernel can handle, and then we build all the user-level signal handling | |
589 | * stack-frames in one go after that. | |
590 | */ | |
36984265 | 591 | static void do_signal(struct pt_regs *regs, int syscall) |
1da177e4 LT |
592 | { |
593 | struct k_sigaction ka; | |
594 | siginfo_t info; | |
595 | int signr; | |
596 | ||
597 | /* | |
598 | * We want the common case to go fast, which | |
599 | * is why we may in certain cases get here from | |
600 | * kernel mode. Just return without doing anything | |
601 | * if so. | |
602 | */ | |
603 | if (!user_mode(regs)) | |
36984265 | 604 | return; |
1da177e4 | 605 | |
bdb94f3a | 606 | if (try_to_freeze()) |
1da177e4 LT |
607 | goto no_signal; |
608 | ||
b2a0d36f | 609 | single_step_clear(current); |
1da177e4 LT |
610 | |
611 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
612 | if (signr > 0) { | |
36984265 MP |
613 | sigset_t *oldset; |
614 | ||
615 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
616 | oldset = ¤t->saved_sigmask; | |
617 | else | |
618 | oldset = ¤t->blocked; | |
619 | if (handle_signal(signr, &ka, &info, oldset, regs, syscall) == 0) { | |
620 | /* | |
621 | * A signal was successfully delivered; the saved | |
622 | * sigmask will have been stored in the signal frame, | |
623 | * and will be restored by sigreturn, so we can simply | |
624 | * clear the TIF_RESTORE_SIGMASK flag. | |
625 | */ | |
626 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
627 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
628 | } | |
b2a0d36f | 629 | single_step_set(current); |
36984265 | 630 | return; |
1da177e4 LT |
631 | } |
632 | ||
633 | no_signal: | |
634 | /* | |
635 | * No signal to deliver to the process - restart the syscall. | |
636 | */ | |
637 | if (syscall) { | |
638 | if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) { | |
639 | if (thumb_mode(regs)) { | |
f606a6ff | 640 | regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE; |
1da177e4 LT |
641 | regs->ARM_pc -= 2; |
642 | } else { | |
f606a6ff NP |
643 | #if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT) |
644 | regs->ARM_r7 = __NR_restart_syscall; | |
645 | regs->ARM_pc -= 4; | |
646 | #else | |
1da177e4 | 647 | u32 __user *usp; |
f606a6ff | 648 | u32 swival = __NR_restart_syscall; |
1da177e4 LT |
649 | |
650 | regs->ARM_sp -= 12; | |
651 | usp = (u32 __user *)regs->ARM_sp; | |
652 | ||
f606a6ff NP |
653 | /* |
654 | * Either we supports OABI only, or we have | |
655 | * EABI with the OABI compat layer enabled. | |
656 | * In the later case we don't know if user | |
657 | * space is EABI or not, and if not we must | |
658 | * not clobber r7. Always using the OABI | |
659 | * syscall solves that issue and works for | |
660 | * all those cases. | |
661 | */ | |
95eaa5fa | 662 | swival = swival - __NR_SYSCALL_BASE + __NR_OABI_SYSCALL_BASE; |
f606a6ff | 663 | |
1da177e4 LT |
664 | put_user(regs->ARM_pc, &usp[0]); |
665 | /* swi __NR_restart_syscall */ | |
f606a6ff | 666 | put_user(0xef000000 | swival, &usp[1]); |
1da177e4 LT |
667 | /* ldr pc, [sp], #12 */ |
668 | put_user(0xe49df00c, &usp[2]); | |
669 | ||
670 | flush_icache_range((unsigned long)usp, | |
671 | (unsigned long)(usp + 3)); | |
672 | ||
673 | regs->ARM_pc = regs->ARM_sp + 4; | |
f606a6ff | 674 | #endif |
1da177e4 LT |
675 | } |
676 | } | |
677 | if (regs->ARM_r0 == -ERESTARTNOHAND || | |
678 | regs->ARM_r0 == -ERESTARTSYS || | |
679 | regs->ARM_r0 == -ERESTARTNOINTR) { | |
288ddad5 | 680 | setup_syscall_restart(regs); |
1da177e4 | 681 | } |
36984265 MP |
682 | |
683 | /* If there's no signal to deliver, we just put the saved sigmask | |
684 | * back. | |
685 | */ | |
686 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
687 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
688 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
689 | } | |
1da177e4 | 690 | } |
b2a0d36f | 691 | single_step_set(current); |
1da177e4 LT |
692 | } |
693 | ||
694 | asmlinkage void | |
695 | do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall) | |
696 | { | |
697 | if (thread_flags & _TIF_SIGPENDING) | |
36984265 | 698 | do_signal(regs, syscall); |
d0420c83 DH |
699 | |
700 | if (thread_flags & _TIF_NOTIFY_RESUME) { | |
701 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
702 | tracehook_notify_resume(regs); | |
ee18d64c DH |
703 | if (current->replacement_session_keyring) |
704 | key_replace_session_keyring(); | |
d0420c83 | 705 | } |
1da177e4 | 706 | } |