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1da177e4 LT |
1 | /* $Id: signal32.c,v 1.74 2002/02/09 19:49:30 davem Exp $ |
2 | * arch/sparc64/kernel/signal32.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
6 | * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) | |
7 | * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) | |
8 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
9 | */ | |
10 | ||
11 | #include <linux/sched.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/signal.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/wait.h> | |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/unistd.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/tty.h> | |
1da177e4 LT |
20 | #include <linux/binfmts.h> |
21 | #include <linux/compat.h> | |
22 | #include <linux/bitops.h> | |
23 | ||
24 | #include <asm/uaccess.h> | |
25 | #include <asm/ptrace.h> | |
1da177e4 LT |
26 | #include <asm/pgtable.h> |
27 | #include <asm/psrcompat.h> | |
28 | #include <asm/fpumacro.h> | |
29 | #include <asm/visasm.h> | |
14cc6aba | 30 | #include <asm/compat_signal.h> |
1da177e4 LT |
31 | |
32 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
33 | ||
1da177e4 LT |
34 | /* Signal frames: the original one (compatible with SunOS): |
35 | * | |
36 | * Set up a signal frame... Make the stack look the way SunOS | |
37 | * expects it to look which is basically: | |
38 | * | |
39 | * ---------------------------------- <-- %sp at signal time | |
40 | * Struct sigcontext | |
41 | * Signal address | |
42 | * Ptr to sigcontext area above | |
43 | * Signal code | |
44 | * The signal number itself | |
45 | * One register window | |
46 | * ---------------------------------- <-- New %sp | |
47 | */ | |
48 | struct signal_sframe32 { | |
49 | struct reg_window32 sig_window; | |
50 | int sig_num; | |
51 | int sig_code; | |
52 | /* struct sigcontext32 * */ u32 sig_scptr; | |
53 | int sig_address; | |
54 | struct sigcontext32 sig_context; | |
55 | unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; | |
56 | }; | |
57 | ||
58 | /* This magic should be in g_upper[0] for all upper parts | |
59 | * to be valid. | |
60 | */ | |
61 | #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 | |
62 | typedef struct { | |
63 | unsigned int g_upper[8]; | |
64 | unsigned int o_upper[8]; | |
65 | unsigned int asi; | |
66 | } siginfo_extra_v8plus_t; | |
67 | ||
68 | /* | |
69 | * And the new one, intended to be used for Linux applications only | |
70 | * (we have enough in there to work with clone). | |
71 | * All the interesting bits are in the info field. | |
72 | */ | |
73 | struct new_signal_frame32 { | |
74 | struct sparc_stackf32 ss; | |
75 | __siginfo32_t info; | |
76 | /* __siginfo_fpu32_t * */ u32 fpu_save; | |
77 | unsigned int insns[2]; | |
78 | unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; | |
79 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ | |
80 | /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
81 | siginfo_extra_v8plus_t v8plus; | |
82 | __siginfo_fpu_t fpu_state; | |
83 | }; | |
84 | ||
85 | typedef struct compat_siginfo{ | |
86 | int si_signo; | |
87 | int si_errno; | |
88 | int si_code; | |
89 | ||
90 | union { | |
91 | int _pad[SI_PAD_SIZE32]; | |
92 | ||
93 | /* kill() */ | |
94 | struct { | |
95 | compat_pid_t _pid; /* sender's pid */ | |
96 | unsigned int _uid; /* sender's uid */ | |
97 | } _kill; | |
98 | ||
99 | /* POSIX.1b timers */ | |
100 | struct { | |
0d77e5a2 | 101 | compat_timer_t _tid; /* timer id */ |
1da177e4 LT |
102 | int _overrun; /* overrun count */ |
103 | compat_sigval_t _sigval; /* same as below */ | |
104 | int _sys_private; /* not to be passed to user */ | |
105 | } _timer; | |
106 | ||
107 | /* POSIX.1b signals */ | |
108 | struct { | |
109 | compat_pid_t _pid; /* sender's pid */ | |
110 | unsigned int _uid; /* sender's uid */ | |
111 | compat_sigval_t _sigval; | |
112 | } _rt; | |
113 | ||
114 | /* SIGCHLD */ | |
115 | struct { | |
116 | compat_pid_t _pid; /* which child */ | |
117 | unsigned int _uid; /* sender's uid */ | |
118 | int _status; /* exit code */ | |
119 | compat_clock_t _utime; | |
120 | compat_clock_t _stime; | |
121 | } _sigchld; | |
122 | ||
123 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */ | |
124 | struct { | |
125 | u32 _addr; /* faulting insn/memory ref. */ | |
126 | int _trapno; | |
127 | } _sigfault; | |
128 | ||
129 | /* SIGPOLL */ | |
130 | struct { | |
131 | int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ | |
132 | int _fd; | |
133 | } _sigpoll; | |
134 | } _sifields; | |
135 | }compat_siginfo_t; | |
136 | ||
137 | struct rt_signal_frame32 { | |
138 | struct sparc_stackf32 ss; | |
139 | compat_siginfo_t info; | |
140 | struct pt_regs32 regs; | |
141 | compat_sigset_t mask; | |
142 | /* __siginfo_fpu32_t * */ u32 fpu_save; | |
143 | unsigned int insns[2]; | |
144 | stack_t32 stack; | |
145 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ | |
146 | /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
147 | siginfo_extra_v8plus_t v8plus; | |
148 | __siginfo_fpu_t fpu_state; | |
149 | }; | |
150 | ||
151 | /* Align macros */ | |
152 | #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe32) + 7) & (~7))) | |
153 | #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame32) + 7) & (~7))) | |
154 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame32) + 7) & (~7))) | |
155 | ||
156 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
157 | { | |
158 | int err; | |
159 | ||
160 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
161 | return -EFAULT; | |
162 | ||
163 | /* If you change siginfo_t structure, please be sure | |
164 | this code is fixed accordingly. | |
165 | It should never copy any pad contained in the structure | |
166 | to avoid security leaks, but must copy the generic | |
167 | 3 ints plus the relevant union member. | |
168 | This routine must convert siginfo from 64bit to 32bit as well | |
169 | at the same time. */ | |
170 | err = __put_user(from->si_signo, &to->si_signo); | |
171 | err |= __put_user(from->si_errno, &to->si_errno); | |
172 | err |= __put_user((short)from->si_code, &to->si_code); | |
173 | if (from->si_code < 0) | |
174 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
175 | else { | |
176 | switch (from->si_code >> 16) { | |
177 | case __SI_TIMER >> 16: | |
178 | err |= __put_user(from->si_tid, &to->si_tid); | |
179 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
180 | err |= __put_user(from->si_int, &to->si_int); | |
181 | break; | |
182 | case __SI_CHLD >> 16: | |
183 | err |= __put_user(from->si_utime, &to->si_utime); | |
184 | err |= __put_user(from->si_stime, &to->si_stime); | |
185 | err |= __put_user(from->si_status, &to->si_status); | |
186 | default: | |
187 | err |= __put_user(from->si_pid, &to->si_pid); | |
188 | err |= __put_user(from->si_uid, &to->si_uid); | |
189 | break; | |
190 | case __SI_FAULT >> 16: | |
1da177e4 LT |
191 | err |= __put_user(from->si_trapno, &to->si_trapno); |
192 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); | |
193 | break; | |
9c7d3b3a JS |
194 | case __SI_POLL >> 16: |
195 | err |= __put_user(from->si_band, &to->si_band); | |
196 | err |= __put_user(from->si_fd, &to->si_fd); | |
197 | break; | |
1da177e4 LT |
198 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
199 | case __SI_MESGQ >> 16: | |
200 | err |= __put_user(from->si_pid, &to->si_pid); | |
201 | err |= __put_user(from->si_uid, &to->si_uid); | |
202 | err |= __put_user(from->si_int, &to->si_int); | |
203 | break; | |
204 | } | |
205 | } | |
206 | return err; | |
207 | } | |
208 | ||
209 | /* CAUTION: This is just a very minimalist implementation for the | |
210 | * sake of compat_sys_rt_sigqueueinfo() | |
211 | */ | |
212 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
213 | { | |
214 | if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) | |
215 | return -EFAULT; | |
216 | ||
217 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
218 | copy_from_user(to->_sifields._pad, from->_sifields._pad, | |
219 | SI_PAD_SIZE)) | |
220 | return -EFAULT; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
1da177e4 LT |
225 | static int restore_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) |
226 | { | |
227 | unsigned long *fpregs = current_thread_info()->fpregs; | |
228 | unsigned long fprs; | |
229 | int err; | |
230 | ||
231 | err = __get_user(fprs, &fpu->si_fprs); | |
232 | fprs_write(0); | |
233 | regs->tstate &= ~TSTATE_PEF; | |
234 | if (fprs & FPRS_DL) | |
235 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], (sizeof(unsigned int) * 32)); | |
236 | if (fprs & FPRS_DU) | |
237 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], (sizeof(unsigned int) * 32)); | |
238 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
239 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
240 | current_thread_info()->fpsaved[0] |= fprs; | |
241 | return err; | |
242 | } | |
243 | ||
244 | void do_new_sigreturn32(struct pt_regs *regs) | |
245 | { | |
246 | struct new_signal_frame32 __user *sf; | |
247 | unsigned int psr; | |
248 | unsigned pc, npc, fpu_save; | |
249 | sigset_t set; | |
250 | unsigned seta[_COMPAT_NSIG_WORDS]; | |
251 | int err, i; | |
252 | ||
253 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
254 | sf = (struct new_signal_frame32 __user *) regs->u_regs[UREG_FP]; | |
255 | ||
256 | /* 1. Make sure we are not getting garbage from the user */ | |
257 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
258 | (((unsigned long) sf) & 3)) | |
259 | goto segv; | |
260 | ||
261 | get_user(pc, &sf->info.si_regs.pc); | |
262 | __get_user(npc, &sf->info.si_regs.npc); | |
263 | ||
264 | if ((pc | npc) & 3) | |
265 | goto segv; | |
266 | ||
267 | if (test_thread_flag(TIF_32BIT)) { | |
268 | pc &= 0xffffffff; | |
269 | npc &= 0xffffffff; | |
270 | } | |
271 | regs->tpc = pc; | |
272 | regs->tnpc = npc; | |
273 | ||
274 | /* 2. Restore the state */ | |
275 | err = __get_user(regs->y, &sf->info.si_regs.y); | |
276 | err |= __get_user(psr, &sf->info.si_regs.psr); | |
277 | ||
278 | for (i = UREG_G1; i <= UREG_I7; i++) | |
279 | err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
280 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
281 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
282 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
283 | unsigned long asi; | |
284 | ||
285 | for (i = UREG_G1; i <= UREG_I7; i++) | |
286 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
287 | err |= __get_user(asi, &sf->v8plus.asi); | |
288 | regs->tstate &= ~TSTATE_ASI; | |
289 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
290 | } | |
291 | } | |
292 | ||
293 | /* User can only change condition codes in %tstate. */ | |
294 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
295 | regs->tstate |= psr_to_tstate_icc(psr); | |
296 | ||
297 | err |= __get_user(fpu_save, &sf->fpu_save); | |
298 | if (fpu_save) | |
299 | err |= restore_fpu_state32(regs, &sf->fpu_state); | |
300 | err |= __get_user(seta[0], &sf->info.si_mask); | |
301 | err |= copy_from_user(seta+1, &sf->extramask, | |
302 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
303 | if (err) | |
304 | goto segv; | |
305 | switch (_NSIG_WORDS) { | |
306 | case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32); | |
307 | case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32); | |
308 | case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32); | |
309 | case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32); | |
310 | } | |
311 | sigdelsetmask(&set, ~_BLOCKABLE); | |
312 | spin_lock_irq(¤t->sighand->siglock); | |
313 | current->blocked = set; | |
314 | recalc_sigpending(); | |
315 | spin_unlock_irq(¤t->sighand->siglock); | |
316 | return; | |
317 | ||
318 | segv: | |
319 | force_sig(SIGSEGV, current); | |
320 | } | |
321 | ||
322 | asmlinkage void do_sigreturn32(struct pt_regs *regs) | |
323 | { | |
324 | struct sigcontext32 __user *scptr; | |
325 | unsigned int pc, npc, psr; | |
326 | sigset_t set; | |
327 | unsigned int seta[_COMPAT_NSIG_WORDS]; | |
328 | int err; | |
329 | ||
330 | /* Always make any pending restarted system calls return -EINTR */ | |
331 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
332 | ||
333 | synchronize_user_stack(); | |
334 | if (test_thread_flag(TIF_NEWSIGNALS)) { | |
335 | do_new_sigreturn32(regs); | |
336 | return; | |
337 | } | |
338 | ||
339 | scptr = (struct sigcontext32 __user *) | |
340 | (regs->u_regs[UREG_I0] & 0x00000000ffffffffUL); | |
341 | /* Check sanity of the user arg. */ | |
342 | if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext32)) || | |
343 | (((unsigned long) scptr) & 3)) | |
344 | goto segv; | |
345 | ||
346 | err = __get_user(pc, &scptr->sigc_pc); | |
347 | err |= __get_user(npc, &scptr->sigc_npc); | |
348 | ||
349 | if ((pc | npc) & 3) | |
350 | goto segv; /* Nice try. */ | |
351 | ||
352 | err |= __get_user(seta[0], &scptr->sigc_mask); | |
353 | /* Note that scptr + 1 points to extramask */ | |
354 | err |= copy_from_user(seta+1, scptr + 1, | |
355 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
356 | if (err) | |
357 | goto segv; | |
358 | switch (_NSIG_WORDS) { | |
359 | case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32); | |
360 | case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32); | |
361 | case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32); | |
362 | case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32); | |
363 | } | |
364 | sigdelsetmask(&set, ~_BLOCKABLE); | |
365 | spin_lock_irq(¤t->sighand->siglock); | |
366 | current->blocked = set; | |
367 | recalc_sigpending(); | |
368 | spin_unlock_irq(¤t->sighand->siglock); | |
369 | ||
370 | if (test_thread_flag(TIF_32BIT)) { | |
371 | pc &= 0xffffffff; | |
372 | npc &= 0xffffffff; | |
373 | } | |
374 | regs->tpc = pc; | |
375 | regs->tnpc = npc; | |
376 | err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp); | |
377 | err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0); | |
378 | err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1); | |
379 | ||
380 | /* User can only change condition codes in %tstate. */ | |
381 | err |= __get_user(psr, &scptr->sigc_psr); | |
382 | if (err) | |
383 | goto segv; | |
384 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
385 | regs->tstate |= psr_to_tstate_icc(psr); | |
386 | return; | |
387 | ||
388 | segv: | |
389 | force_sig(SIGSEGV, current); | |
390 | } | |
391 | ||
392 | asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) | |
393 | { | |
394 | struct rt_signal_frame32 __user *sf; | |
395 | unsigned int psr, pc, npc, fpu_save, u_ss_sp; | |
396 | mm_segment_t old_fs; | |
397 | sigset_t set; | |
398 | compat_sigset_t seta; | |
399 | stack_t st; | |
400 | int err, i; | |
401 | ||
402 | /* Always make any pending restarted system calls return -EINTR */ | |
403 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
404 | ||
405 | synchronize_user_stack(); | |
406 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
407 | sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; | |
408 | ||
409 | /* 1. Make sure we are not getting garbage from the user */ | |
410 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
411 | (((unsigned long) sf) & 3)) | |
412 | goto segv; | |
413 | ||
414 | get_user(pc, &sf->regs.pc); | |
415 | __get_user(npc, &sf->regs.npc); | |
416 | ||
417 | if ((pc | npc) & 3) | |
418 | goto segv; | |
419 | ||
420 | if (test_thread_flag(TIF_32BIT)) { | |
421 | pc &= 0xffffffff; | |
422 | npc &= 0xffffffff; | |
423 | } | |
424 | regs->tpc = pc; | |
425 | regs->tnpc = npc; | |
426 | ||
427 | /* 2. Restore the state */ | |
428 | err = __get_user(regs->y, &sf->regs.y); | |
429 | err |= __get_user(psr, &sf->regs.psr); | |
430 | ||
431 | for (i = UREG_G1; i <= UREG_I7; i++) | |
432 | err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
433 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
434 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
435 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
436 | unsigned long asi; | |
437 | ||
438 | for (i = UREG_G1; i <= UREG_I7; i++) | |
439 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
440 | err |= __get_user(asi, &sf->v8plus.asi); | |
441 | regs->tstate &= ~TSTATE_ASI; | |
442 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
443 | } | |
444 | } | |
445 | ||
446 | /* User can only change condition codes in %tstate. */ | |
447 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
448 | regs->tstate |= psr_to_tstate_icc(psr); | |
449 | ||
450 | err |= __get_user(fpu_save, &sf->fpu_save); | |
451 | if (fpu_save) | |
452 | err |= restore_fpu_state32(regs, &sf->fpu_state); | |
453 | err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t)); | |
454 | err |= __get_user(u_ss_sp, &sf->stack.ss_sp); | |
455 | st.ss_sp = compat_ptr(u_ss_sp); | |
456 | err |= __get_user(st.ss_flags, &sf->stack.ss_flags); | |
457 | err |= __get_user(st.ss_size, &sf->stack.ss_size); | |
458 | if (err) | |
459 | goto segv; | |
460 | ||
461 | /* It is more difficult to avoid calling this function than to | |
462 | call it and ignore errors. */ | |
463 | old_fs = get_fs(); | |
464 | set_fs(KERNEL_DS); | |
465 | do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf); | |
466 | set_fs(old_fs); | |
467 | ||
468 | switch (_NSIG_WORDS) { | |
469 | case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32); | |
470 | case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32); | |
471 | case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32); | |
472 | case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); | |
473 | } | |
474 | sigdelsetmask(&set, ~_BLOCKABLE); | |
475 | spin_lock_irq(¤t->sighand->siglock); | |
476 | current->blocked = set; | |
477 | recalc_sigpending(); | |
478 | spin_unlock_irq(¤t->sighand->siglock); | |
479 | return; | |
480 | segv: | |
481 | force_sig(SIGSEGV, current); | |
482 | } | |
483 | ||
484 | /* Checks if the fp is valid */ | |
485 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
486 | { | |
487 | if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen) | |
488 | return 1; | |
489 | return 0; | |
490 | } | |
491 | ||
492 | static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) | |
493 | { | |
494 | unsigned long sp; | |
495 | ||
496 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
497 | sp = regs->u_regs[UREG_FP]; | |
498 | ||
499 | /* This is the X/Open sanctioned signal stack switching. */ | |
500 | if (sa->sa_flags & SA_ONSTACK) { | |
501 | if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7)) | |
502 | sp = current->sas_ss_sp + current->sas_ss_size; | |
503 | } | |
504 | return (void __user *)(sp - framesize); | |
505 | } | |
506 | ||
507 | static void | |
508 | setup_frame32(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info) | |
509 | { | |
510 | struct signal_sframe32 __user *sframep; | |
511 | struct sigcontext32 __user *sc; | |
512 | unsigned int seta[_COMPAT_NSIG_WORDS]; | |
513 | int err = 0; | |
514 | void __user *sig_address; | |
515 | int sig_code; | |
516 | unsigned long pc = regs->tpc; | |
517 | unsigned long npc = regs->tnpc; | |
518 | unsigned int psr; | |
519 | ||
520 | if (test_thread_flag(TIF_32BIT)) { | |
521 | pc &= 0xffffffff; | |
522 | npc &= 0xffffffff; | |
523 | } | |
524 | ||
525 | synchronize_user_stack(); | |
526 | save_and_clear_fpu(); | |
527 | ||
528 | sframep = (struct signal_sframe32 __user *) | |
529 | get_sigframe(sa, regs, SF_ALIGNEDSZ); | |
530 | if (invalid_frame_pointer(sframep, sizeof(*sframep))){ | |
531 | /* Don't change signal code and address, so that | |
532 | * post mortem debuggers can have a look. | |
533 | */ | |
534 | do_exit(SIGILL); | |
535 | } | |
536 | ||
537 | sc = &sframep->sig_context; | |
538 | ||
539 | /* We've already made sure frame pointer isn't in kernel space... */ | |
540 | err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK), | |
541 | &sc->sigc_onstack); | |
542 | ||
543 | switch (_NSIG_WORDS) { | |
544 | case 4: seta[7] = (oldset->sig[3] >> 32); | |
545 | seta[6] = oldset->sig[3]; | |
546 | case 3: seta[5] = (oldset->sig[2] >> 32); | |
547 | seta[4] = oldset->sig[2]; | |
548 | case 2: seta[3] = (oldset->sig[1] >> 32); | |
549 | seta[2] = oldset->sig[1]; | |
550 | case 1: seta[1] = (oldset->sig[0] >> 32); | |
551 | seta[0] = oldset->sig[0]; | |
552 | } | |
553 | err |= __put_user(seta[0], &sc->sigc_mask); | |
554 | err |= __copy_to_user(sframep->extramask, seta + 1, | |
555 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
556 | err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp); | |
557 | err |= __put_user(pc, &sc->sigc_pc); | |
558 | err |= __put_user(npc, &sc->sigc_npc); | |
559 | psr = tstate_to_psr(regs->tstate); | |
560 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
561 | psr |= PSR_EF; | |
562 | err |= __put_user(psr, &sc->sigc_psr); | |
563 | err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1); | |
564 | err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0); | |
565 | err |= __put_user(get_thread_wsaved(), &sc->sigc_oswins); | |
566 | ||
567 | err |= copy_in_user((u32 __user *)sframep, | |
568 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
569 | sizeof(struct reg_window32)); | |
570 | ||
571 | set_thread_wsaved(0); /* So process is allowed to execute. */ | |
572 | err |= __put_user(signr, &sframep->sig_num); | |
573 | sig_address = NULL; | |
574 | sig_code = 0; | |
575 | if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) { | |
576 | sig_address = info->si_addr; | |
577 | switch (signr) { | |
578 | case SIGSEGV: | |
579 | switch (info->si_code) { | |
580 | case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break; | |
581 | default: sig_code = SUBSIG_PROTECTION; break; | |
582 | } | |
583 | break; | |
584 | case SIGILL: | |
585 | switch (info->si_code) { | |
586 | case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break; | |
587 | case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break; | |
588 | case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break; | |
589 | default: sig_code = SUBSIG_STACK; break; | |
590 | } | |
591 | break; | |
592 | case SIGFPE: | |
593 | switch (info->si_code) { | |
594 | case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break; | |
595 | case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break; | |
596 | case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break; | |
597 | case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break; | |
598 | case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break; | |
599 | case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break; | |
600 | case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break; | |
601 | default: sig_code = SUBSIG_FPERROR; break; | |
602 | } | |
603 | break; | |
604 | case SIGBUS: | |
605 | switch (info->si_code) { | |
606 | case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break; | |
607 | case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break; | |
608 | default: sig_code = SUBSIG_BUSTIMEOUT; break; | |
609 | } | |
610 | break; | |
611 | case SIGEMT: | |
612 | switch (info->si_code) { | |
613 | case EMT_TAGOVF: sig_code = SUBSIG_TAG; break; | |
614 | } | |
615 | break; | |
616 | case SIGSYS: | |
617 | if (info->si_code == (__SI_FAULT|0x100)) { | |
618 | /* See sys_sunos32.c */ | |
619 | sig_code = info->si_trapno; | |
620 | break; | |
621 | } | |
622 | default: | |
623 | sig_address = NULL; | |
624 | } | |
625 | } | |
626 | err |= __put_user(ptr_to_compat(sig_address), &sframep->sig_address); | |
627 | err |= __put_user(sig_code, &sframep->sig_code); | |
628 | err |= __put_user(ptr_to_compat(sc), &sframep->sig_scptr); | |
629 | if (err) | |
630 | goto sigsegv; | |
631 | ||
632 | regs->u_regs[UREG_FP] = (unsigned long) sframep; | |
633 | regs->tpc = (unsigned long) sa->sa_handler; | |
634 | regs->tnpc = (regs->tpc + 4); | |
635 | if (test_thread_flag(TIF_32BIT)) { | |
636 | regs->tpc &= 0xffffffff; | |
637 | regs->tnpc &= 0xffffffff; | |
638 | } | |
639 | return; | |
640 | ||
641 | sigsegv: | |
642 | force_sigsegv(signr, current); | |
643 | } | |
644 | ||
645 | ||
646 | static int save_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
647 | { | |
648 | unsigned long *fpregs = current_thread_info()->fpregs; | |
649 | unsigned long fprs; | |
650 | int err = 0; | |
651 | ||
652 | fprs = current_thread_info()->fpsaved[0]; | |
653 | if (fprs & FPRS_DL) | |
654 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
655 | (sizeof(unsigned int) * 32)); | |
656 | if (fprs & FPRS_DU) | |
657 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
658 | (sizeof(unsigned int) * 32)); | |
659 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
660 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
661 | err |= __put_user(fprs, &fpu->si_fprs); | |
662 | ||
663 | return err; | |
664 | } | |
665 | ||
666 | static void new_setup_frame32(struct k_sigaction *ka, struct pt_regs *regs, | |
667 | int signo, sigset_t *oldset) | |
668 | { | |
669 | struct new_signal_frame32 __user *sf; | |
670 | int sigframe_size; | |
671 | u32 psr; | |
672 | int i, err; | |
673 | unsigned int seta[_COMPAT_NSIG_WORDS]; | |
674 | ||
675 | /* 1. Make sure everything is clean */ | |
676 | synchronize_user_stack(); | |
677 | save_and_clear_fpu(); | |
678 | ||
679 | sigframe_size = NF_ALIGNEDSZ; | |
680 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) | |
681 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
682 | ||
683 | sf = (struct new_signal_frame32 __user *) | |
684 | get_sigframe(&ka->sa, regs, sigframe_size); | |
685 | ||
686 | if (invalid_frame_pointer(sf, sigframe_size)) | |
687 | goto sigill; | |
688 | ||
689 | if (get_thread_wsaved() != 0) | |
690 | goto sigill; | |
691 | ||
692 | /* 2. Save the current process state */ | |
693 | if (test_thread_flag(TIF_32BIT)) { | |
694 | regs->tpc &= 0xffffffff; | |
695 | regs->tnpc &= 0xffffffff; | |
696 | } | |
697 | err = put_user(regs->tpc, &sf->info.si_regs.pc); | |
698 | err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); | |
699 | err |= __put_user(regs->y, &sf->info.si_regs.y); | |
700 | psr = tstate_to_psr(regs->tstate); | |
701 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
702 | psr |= PSR_EF; | |
703 | err |= __put_user(psr, &sf->info.si_regs.psr); | |
704 | for (i = 0; i < 16; i++) | |
705 | err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
706 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
707 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
708 | for (i = 1; i < 16; i++) | |
709 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
710 | &sf->v8plus.g_upper[i]); | |
711 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
712 | &sf->v8plus.asi); | |
713 | ||
714 | if (psr & PSR_EF) { | |
715 | err |= save_fpu_state32(regs, &sf->fpu_state); | |
716 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
717 | } else { | |
718 | err |= __put_user(0, &sf->fpu_save); | |
719 | } | |
720 | ||
721 | switch (_NSIG_WORDS) { | |
722 | case 4: seta[7] = (oldset->sig[3] >> 32); | |
723 | seta[6] = oldset->sig[3]; | |
724 | case 3: seta[5] = (oldset->sig[2] >> 32); | |
725 | seta[4] = oldset->sig[2]; | |
726 | case 2: seta[3] = (oldset->sig[1] >> 32); | |
727 | seta[2] = oldset->sig[1]; | |
728 | case 1: seta[1] = (oldset->sig[0] >> 32); | |
729 | seta[0] = oldset->sig[0]; | |
730 | } | |
731 | err |= __put_user(seta[0], &sf->info.si_mask); | |
732 | err |= __copy_to_user(sf->extramask, seta + 1, | |
733 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
734 | ||
735 | err |= copy_in_user((u32 __user *)sf, | |
736 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
737 | sizeof(struct reg_window32)); | |
738 | ||
739 | if (err) | |
740 | goto sigsegv; | |
741 | ||
742 | /* 3. signal handler back-trampoline and parameters */ | |
743 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
744 | regs->u_regs[UREG_I0] = signo; | |
745 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
746 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
747 | ||
748 | /* 4. signal handler */ | |
749 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
750 | regs->tnpc = (regs->tpc + 4); | |
751 | if (test_thread_flag(TIF_32BIT)) { | |
752 | regs->tpc &= 0xffffffff; | |
753 | regs->tnpc &= 0xffffffff; | |
754 | } | |
755 | ||
756 | /* 5. return to kernel instructions */ | |
757 | if (ka->ka_restorer) { | |
758 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
759 | } else { | |
760 | /* Flush instruction space. */ | |
761 | unsigned long address = ((unsigned long)&(sf->insns[0])); | |
762 | pgd_t *pgdp = pgd_offset(current->mm, address); | |
763 | pud_t *pudp = pud_offset(pgdp, address); | |
764 | pmd_t *pmdp = pmd_offset(pudp, address); | |
765 | pte_t *ptep; | |
b8ae4865 | 766 | pte_t pte; |
1da177e4 LT |
767 | |
768 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
769 | ||
770 | err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ | |
771 | err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ | |
772 | if (err) | |
773 | goto sigsegv; | |
774 | ||
775 | preempt_disable(); | |
776 | ptep = pte_offset_map(pmdp, address); | |
b8ae4865 HD |
777 | pte = *ptep; |
778 | if (pte_present(pte)) { | |
1da177e4 | 779 | unsigned long page = (unsigned long) |
b8ae4865 | 780 | page_address(pte_page(pte)); |
1da177e4 | 781 | |
4f07118f DM |
782 | wmb(); |
783 | __asm__ __volatile__("flush %0 + %1" | |
784 | : /* no outputs */ | |
785 | : "r" (page), | |
786 | "r" (address & (PAGE_SIZE - 1)) | |
787 | : "memory"); | |
1da177e4 LT |
788 | } |
789 | pte_unmap(ptep); | |
790 | preempt_enable(); | |
791 | } | |
792 | return; | |
793 | ||
794 | sigill: | |
795 | do_exit(SIGILL); | |
796 | sigsegv: | |
797 | force_sigsegv(signo, current); | |
798 | } | |
799 | ||
1da177e4 LT |
800 | static void setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs, |
801 | unsigned long signr, sigset_t *oldset, | |
802 | siginfo_t *info) | |
803 | { | |
804 | struct rt_signal_frame32 __user *sf; | |
805 | int sigframe_size; | |
806 | u32 psr; | |
807 | int i, err; | |
808 | compat_sigset_t seta; | |
809 | ||
810 | /* 1. Make sure everything is clean */ | |
811 | synchronize_user_stack(); | |
812 | save_and_clear_fpu(); | |
813 | ||
814 | sigframe_size = RT_ALIGNEDSZ; | |
815 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) | |
816 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
817 | ||
818 | sf = (struct rt_signal_frame32 __user *) | |
819 | get_sigframe(&ka->sa, regs, sigframe_size); | |
820 | ||
821 | if (invalid_frame_pointer(sf, sigframe_size)) | |
822 | goto sigill; | |
823 | ||
824 | if (get_thread_wsaved() != 0) | |
825 | goto sigill; | |
826 | ||
827 | /* 2. Save the current process state */ | |
828 | if (test_thread_flag(TIF_32BIT)) { | |
829 | regs->tpc &= 0xffffffff; | |
830 | regs->tnpc &= 0xffffffff; | |
831 | } | |
832 | err = put_user(regs->tpc, &sf->regs.pc); | |
833 | err |= __put_user(regs->tnpc, &sf->regs.npc); | |
834 | err |= __put_user(regs->y, &sf->regs.y); | |
835 | psr = tstate_to_psr(regs->tstate); | |
836 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
837 | psr |= PSR_EF; | |
838 | err |= __put_user(psr, &sf->regs.psr); | |
839 | for (i = 0; i < 16; i++) | |
840 | err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
841 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
842 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
843 | for (i = 1; i < 16; i++) | |
844 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
845 | &sf->v8plus.g_upper[i]); | |
846 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
847 | &sf->v8plus.asi); | |
848 | ||
849 | if (psr & PSR_EF) { | |
850 | err |= save_fpu_state32(regs, &sf->fpu_state); | |
851 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
852 | } else { | |
853 | err |= __put_user(0, &sf->fpu_save); | |
854 | } | |
855 | ||
856 | /* Update the siginfo structure. */ | |
857 | err |= copy_siginfo_to_user32(&sf->info, info); | |
858 | ||
859 | /* Setup sigaltstack */ | |
860 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
861 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
862 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
863 | ||
864 | switch (_NSIG_WORDS) { | |
865 | case 4: seta.sig[7] = (oldset->sig[3] >> 32); | |
866 | seta.sig[6] = oldset->sig[3]; | |
867 | case 3: seta.sig[5] = (oldset->sig[2] >> 32); | |
868 | seta.sig[4] = oldset->sig[2]; | |
869 | case 2: seta.sig[3] = (oldset->sig[1] >> 32); | |
870 | seta.sig[2] = oldset->sig[1]; | |
871 | case 1: seta.sig[1] = (oldset->sig[0] >> 32); | |
872 | seta.sig[0] = oldset->sig[0]; | |
873 | } | |
874 | err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t)); | |
875 | ||
876 | err |= copy_in_user((u32 __user *)sf, | |
877 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
878 | sizeof(struct reg_window32)); | |
879 | if (err) | |
880 | goto sigsegv; | |
881 | ||
882 | /* 3. signal handler back-trampoline and parameters */ | |
883 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
884 | regs->u_regs[UREG_I0] = signr; | |
885 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
886 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
887 | ||
888 | /* 4. signal handler */ | |
889 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
890 | regs->tnpc = (regs->tpc + 4); | |
891 | if (test_thread_flag(TIF_32BIT)) { | |
892 | regs->tpc &= 0xffffffff; | |
893 | regs->tnpc &= 0xffffffff; | |
894 | } | |
895 | ||
896 | /* 5. return to kernel instructions */ | |
897 | if (ka->ka_restorer) | |
898 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
899 | else { | |
900 | /* Flush instruction space. */ | |
901 | unsigned long address = ((unsigned long)&(sf->insns[0])); | |
902 | pgd_t *pgdp = pgd_offset(current->mm, address); | |
903 | pud_t *pudp = pud_offset(pgdp, address); | |
904 | pmd_t *pmdp = pmd_offset(pudp, address); | |
905 | pte_t *ptep; | |
906 | ||
907 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
908 | ||
909 | /* mov __NR_rt_sigreturn, %g1 */ | |
910 | err |= __put_user(0x82102065, &sf->insns[0]); | |
911 | ||
912 | /* t 0x10 */ | |
913 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
914 | if (err) | |
915 | goto sigsegv; | |
916 | ||
917 | preempt_disable(); | |
918 | ptep = pte_offset_map(pmdp, address); | |
919 | if (pte_present(*ptep)) { | |
920 | unsigned long page = (unsigned long) | |
921 | page_address(pte_page(*ptep)); | |
922 | ||
4f07118f DM |
923 | wmb(); |
924 | __asm__ __volatile__("flush %0 + %1" | |
925 | : /* no outputs */ | |
926 | : "r" (page), | |
927 | "r" (address & (PAGE_SIZE - 1)) | |
928 | : "memory"); | |
1da177e4 LT |
929 | } |
930 | pte_unmap(ptep); | |
931 | preempt_enable(); | |
932 | } | |
933 | return; | |
934 | ||
935 | sigill: | |
936 | do_exit(SIGILL); | |
937 | sigsegv: | |
938 | force_sigsegv(signr, current); | |
939 | } | |
940 | ||
941 | static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka, | |
942 | siginfo_t *info, | |
ec98c6b9 | 943 | sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 944 | { |
ec98c6b9 DM |
945 | if (ka->sa.sa_flags & SA_SIGINFO) |
946 | setup_rt_frame32(ka, regs, signr, oldset, info); | |
947 | else if (test_thread_flag(TIF_NEWSIGNALS)) | |
948 | new_setup_frame32(ka, regs, signr, oldset); | |
949 | else | |
950 | setup_frame32(&ka->sa, regs, signr, oldset, info); | |
69be8f18 SR |
951 | spin_lock_irq(¤t->sighand->siglock); |
952 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
953 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 954 | sigaddset(¤t->blocked,signr); |
69be8f18 SR |
955 | recalc_sigpending(); |
956 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
957 | } |
958 | ||
959 | static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, | |
960 | struct sigaction *sa) | |
961 | { | |
962 | switch (regs->u_regs[UREG_I0]) { | |
963 | case ERESTART_RESTARTBLOCK: | |
964 | case ERESTARTNOHAND: | |
965 | no_system_call_restart: | |
966 | regs->u_regs[UREG_I0] = EINTR; | |
967 | regs->tstate |= TSTATE_ICARRY; | |
968 | break; | |
969 | case ERESTARTSYS: | |
970 | if (!(sa->sa_flags & SA_RESTART)) | |
971 | goto no_system_call_restart; | |
972 | /* fallthrough */ | |
973 | case ERESTARTNOINTR: | |
974 | regs->u_regs[UREG_I0] = orig_i0; | |
975 | regs->tpc -= 4; | |
976 | regs->tnpc -= 4; | |
977 | } | |
978 | } | |
979 | ||
980 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
981 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
982 | * mistake. | |
983 | */ | |
2d7d5f05 DM |
984 | void do_signal32(sigset_t *oldset, struct pt_regs * regs, |
985 | unsigned long orig_i0, int restart_syscall) | |
1da177e4 LT |
986 | { |
987 | siginfo_t info; | |
988 | struct signal_deliver_cookie cookie; | |
989 | struct k_sigaction ka; | |
990 | int signr; | |
1da177e4 LT |
991 | |
992 | cookie.restart_syscall = restart_syscall; | |
993 | cookie.orig_i0 = orig_i0; | |
994 | ||
995 | signr = get_signal_to_deliver(&info, &ka, regs, &cookie); | |
996 | if (signr > 0) { | |
997 | if (cookie.restart_syscall) | |
998 | syscall_restart32(orig_i0, regs, &ka.sa); | |
ec98c6b9 | 999 | handle_signal32(signr, &ka, &info, oldset, regs); |
2d7d5f05 DM |
1000 | |
1001 | /* a signal was successfully delivered; the saved | |
1002 | * sigmask will have been stored in the signal frame, | |
1003 | * and will be restored by sigreturn, so we can simply | |
1004 | * clear the TIF_RESTORE_SIGMASK flag. | |
1005 | */ | |
1006 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
1007 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1008 | return; | |
1da177e4 LT |
1009 | } |
1010 | if (cookie.restart_syscall && | |
1011 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
1012 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
1013 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
1014 | /* replay the system call when we are done */ | |
1015 | regs->u_regs[UREG_I0] = cookie.orig_i0; | |
1016 | regs->tpc -= 4; | |
1017 | regs->tnpc -= 4; | |
1018 | } | |
1019 | if (cookie.restart_syscall && | |
1020 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
1021 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
1022 | regs->tpc -= 4; | |
1023 | regs->tnpc -= 4; | |
1024 | } | |
2d7d5f05 DM |
1025 | |
1026 | /* if there's no signal to deliver, we just put the saved sigmask | |
1027 | * back | |
1028 | */ | |
1029 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
1030 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1031 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1032 | } | |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | struct sigstack32 { | |
1036 | u32 the_stack; | |
1037 | int cur_status; | |
1038 | }; | |
1039 | ||
1040 | asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) | |
1041 | { | |
1042 | struct sigstack32 __user *ssptr = | |
1043 | (struct sigstack32 __user *)((unsigned long)(u_ssptr)); | |
1044 | struct sigstack32 __user *ossptr = | |
1045 | (struct sigstack32 __user *)((unsigned long)(u_ossptr)); | |
1046 | int ret = -EFAULT; | |
1047 | ||
1048 | /* First see if old state is wanted. */ | |
1049 | if (ossptr) { | |
1050 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
1051 | &ossptr->the_stack) || | |
1052 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
1053 | goto out; | |
1054 | } | |
1055 | ||
1056 | /* Now see if we want to update the new state. */ | |
1057 | if (ssptr) { | |
1058 | u32 ss_sp; | |
1059 | ||
1060 | if (get_user(ss_sp, &ssptr->the_stack)) | |
1061 | goto out; | |
1062 | ||
1063 | /* If the current stack was set with sigaltstack, don't | |
1064 | * swap stacks while we are on it. | |
1065 | */ | |
1066 | ret = -EPERM; | |
1067 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
1068 | goto out; | |
1069 | ||
1070 | /* Since we don't know the extent of the stack, and we don't | |
1071 | * track onstack-ness, but rather calculate it, we must | |
1072 | * presume a size. Ho hum this interface is lossy. | |
1073 | */ | |
1074 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
1075 | current->sas_ss_size = SIGSTKSZ; | |
1076 | } | |
1077 | ||
1078 | ret = 0; | |
1079 | out: | |
1080 | return ret; | |
1081 | } | |
1082 | ||
1083 | asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp) | |
1084 | { | |
1085 | stack_t uss, uoss; | |
1086 | u32 u_ss_sp = 0; | |
1087 | int ret; | |
1088 | mm_segment_t old_fs; | |
1089 | stack_t32 __user *uss32 = compat_ptr(ussa); | |
1090 | stack_t32 __user *uoss32 = compat_ptr(uossa); | |
1091 | ||
1092 | if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) || | |
1093 | __get_user(uss.ss_flags, &uss32->ss_flags) || | |
1094 | __get_user(uss.ss_size, &uss32->ss_size))) | |
1095 | return -EFAULT; | |
1096 | uss.ss_sp = compat_ptr(u_ss_sp); | |
1097 | old_fs = get_fs(); | |
1098 | set_fs(KERNEL_DS); | |
1099 | ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL, | |
1100 | uossa ? (stack_t __user *) &uoss : NULL, sp); | |
1101 | set_fs(old_fs); | |
1102 | if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) || | |
1103 | __put_user(uoss.ss_flags, &uoss32->ss_flags) || | |
1104 | __put_user(uoss.ss_size, &uoss32->ss_size))) | |
1105 | return -EFAULT; | |
1106 | return ret; | |
1107 | } |