Commit | Line | Data |
---|---|---|
5526b7e4 | 1 | /* arch/sparc64/kernel/signal32.c |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1991, 1992 Linus Torvalds | |
4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) | |
6 | * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) | |
7 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/signal.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/ptrace.h> | |
16 | #include <linux/unistd.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/tty.h> | |
1da177e4 LT |
19 | #include <linux/binfmts.h> |
20 | #include <linux/compat.h> | |
21 | #include <linux/bitops.h> | |
95698466 | 22 | #include <linux/tracehook.h> |
1da177e4 LT |
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 | /* This magic should be in g_upper[0] for all upper parts |
35 | * to be valid. | |
36 | */ | |
37 | #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 | |
38 | typedef struct { | |
39 | unsigned int g_upper[8]; | |
40 | unsigned int o_upper[8]; | |
41 | unsigned int asi; | |
42 | } siginfo_extra_v8plus_t; | |
43 | ||
5526b7e4 | 44 | struct signal_frame32 { |
1da177e4 LT |
45 | struct sparc_stackf32 ss; |
46 | __siginfo32_t info; | |
47 | /* __siginfo_fpu32_t * */ u32 fpu_save; | |
48 | unsigned int insns[2]; | |
49 | unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; | |
50 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ | |
51 | /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
52 | siginfo_extra_v8plus_t v8plus; | |
53 | __siginfo_fpu_t fpu_state; | |
54 | }; | |
55 | ||
56 | typedef struct compat_siginfo{ | |
57 | int si_signo; | |
58 | int si_errno; | |
59 | int si_code; | |
60 | ||
61 | union { | |
62 | int _pad[SI_PAD_SIZE32]; | |
63 | ||
64 | /* kill() */ | |
65 | struct { | |
66 | compat_pid_t _pid; /* sender's pid */ | |
67 | unsigned int _uid; /* sender's uid */ | |
68 | } _kill; | |
69 | ||
70 | /* POSIX.1b timers */ | |
71 | struct { | |
0d77e5a2 | 72 | compat_timer_t _tid; /* timer id */ |
1da177e4 LT |
73 | int _overrun; /* overrun count */ |
74 | compat_sigval_t _sigval; /* same as below */ | |
75 | int _sys_private; /* not to be passed to user */ | |
76 | } _timer; | |
77 | ||
78 | /* POSIX.1b signals */ | |
79 | struct { | |
80 | compat_pid_t _pid; /* sender's pid */ | |
81 | unsigned int _uid; /* sender's uid */ | |
82 | compat_sigval_t _sigval; | |
83 | } _rt; | |
84 | ||
85 | /* SIGCHLD */ | |
86 | struct { | |
87 | compat_pid_t _pid; /* which child */ | |
88 | unsigned int _uid; /* sender's uid */ | |
89 | int _status; /* exit code */ | |
90 | compat_clock_t _utime; | |
91 | compat_clock_t _stime; | |
92 | } _sigchld; | |
93 | ||
94 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */ | |
95 | struct { | |
96 | u32 _addr; /* faulting insn/memory ref. */ | |
97 | int _trapno; | |
98 | } _sigfault; | |
99 | ||
100 | /* SIGPOLL */ | |
101 | struct { | |
102 | int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ | |
103 | int _fd; | |
104 | } _sigpoll; | |
105 | } _sifields; | |
106 | }compat_siginfo_t; | |
107 | ||
108 | struct rt_signal_frame32 { | |
109 | struct sparc_stackf32 ss; | |
110 | compat_siginfo_t info; | |
111 | struct pt_regs32 regs; | |
112 | compat_sigset_t mask; | |
113 | /* __siginfo_fpu32_t * */ u32 fpu_save; | |
114 | unsigned int insns[2]; | |
115 | stack_t32 stack; | |
116 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ | |
117 | /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
118 | siginfo_extra_v8plus_t v8plus; | |
119 | __siginfo_fpu_t fpu_state; | |
120 | }; | |
121 | ||
122 | /* Align macros */ | |
f036d9f3 DM |
123 | #define SF_ALIGNEDSZ (((sizeof(struct signal_frame32) + 15) & (~15))) |
124 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame32) + 15) & (~15))) | |
1da177e4 LT |
125 | |
126 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
127 | { | |
128 | int err; | |
129 | ||
130 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
131 | return -EFAULT; | |
132 | ||
133 | /* If you change siginfo_t structure, please be sure | |
134 | this code is fixed accordingly. | |
135 | It should never copy any pad contained in the structure | |
136 | to avoid security leaks, but must copy the generic | |
137 | 3 ints plus the relevant union member. | |
138 | This routine must convert siginfo from 64bit to 32bit as well | |
139 | at the same time. */ | |
140 | err = __put_user(from->si_signo, &to->si_signo); | |
141 | err |= __put_user(from->si_errno, &to->si_errno); | |
142 | err |= __put_user((short)from->si_code, &to->si_code); | |
143 | if (from->si_code < 0) | |
144 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
145 | else { | |
146 | switch (from->si_code >> 16) { | |
147 | case __SI_TIMER >> 16: | |
148 | err |= __put_user(from->si_tid, &to->si_tid); | |
149 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
150 | err |= __put_user(from->si_int, &to->si_int); | |
151 | break; | |
152 | case __SI_CHLD >> 16: | |
153 | err |= __put_user(from->si_utime, &to->si_utime); | |
154 | err |= __put_user(from->si_stime, &to->si_stime); | |
155 | err |= __put_user(from->si_status, &to->si_status); | |
156 | default: | |
157 | err |= __put_user(from->si_pid, &to->si_pid); | |
158 | err |= __put_user(from->si_uid, &to->si_uid); | |
159 | break; | |
160 | case __SI_FAULT >> 16: | |
1da177e4 LT |
161 | err |= __put_user(from->si_trapno, &to->si_trapno); |
162 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); | |
163 | break; | |
9c7d3b3a JS |
164 | case __SI_POLL >> 16: |
165 | err |= __put_user(from->si_band, &to->si_band); | |
166 | err |= __put_user(from->si_fd, &to->si_fd); | |
167 | break; | |
1da177e4 LT |
168 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
169 | case __SI_MESGQ >> 16: | |
170 | err |= __put_user(from->si_pid, &to->si_pid); | |
171 | err |= __put_user(from->si_uid, &to->si_uid); | |
172 | err |= __put_user(from->si_int, &to->si_int); | |
173 | break; | |
174 | } | |
175 | } | |
176 | return err; | |
177 | } | |
178 | ||
179 | /* CAUTION: This is just a very minimalist implementation for the | |
180 | * sake of compat_sys_rt_sigqueueinfo() | |
181 | */ | |
182 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
183 | { | |
184 | if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) | |
185 | return -EFAULT; | |
186 | ||
187 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
188 | copy_from_user(to->_sifields._pad, from->_sifields._pad, | |
189 | SI_PAD_SIZE)) | |
190 | return -EFAULT; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
1da177e4 LT |
195 | static int restore_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) |
196 | { | |
197 | unsigned long *fpregs = current_thread_info()->fpregs; | |
198 | unsigned long fprs; | |
199 | int err; | |
200 | ||
201 | err = __get_user(fprs, &fpu->si_fprs); | |
202 | fprs_write(0); | |
203 | regs->tstate &= ~TSTATE_PEF; | |
204 | if (fprs & FPRS_DL) | |
205 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], (sizeof(unsigned int) * 32)); | |
206 | if (fprs & FPRS_DU) | |
207 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], (sizeof(unsigned int) * 32)); | |
208 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
209 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
210 | current_thread_info()->fpsaved[0] |= fprs; | |
211 | return err; | |
212 | } | |
213 | ||
5526b7e4 | 214 | void do_sigreturn32(struct pt_regs *regs) |
1da177e4 | 215 | { |
5526b7e4 | 216 | struct signal_frame32 __user *sf; |
1da177e4 LT |
217 | unsigned int psr; |
218 | unsigned pc, npc, fpu_save; | |
219 | sigset_t set; | |
220 | unsigned seta[_COMPAT_NSIG_WORDS]; | |
221 | int err, i; | |
222 | ||
5526b7e4 DM |
223 | /* Always make any pending restarted system calls return -EINTR */ |
224 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
225 | ||
226 | synchronize_user_stack(); | |
227 | ||
1da177e4 | 228 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
5526b7e4 | 229 | sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; |
1da177e4 LT |
230 | |
231 | /* 1. Make sure we are not getting garbage from the user */ | |
232 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
233 | (((unsigned long) sf) & 3)) | |
234 | goto segv; | |
235 | ||
236 | get_user(pc, &sf->info.si_regs.pc); | |
237 | __get_user(npc, &sf->info.si_regs.npc); | |
238 | ||
239 | if ((pc | npc) & 3) | |
240 | goto segv; | |
241 | ||
242 | if (test_thread_flag(TIF_32BIT)) { | |
243 | pc &= 0xffffffff; | |
244 | npc &= 0xffffffff; | |
245 | } | |
246 | regs->tpc = pc; | |
247 | regs->tnpc = npc; | |
248 | ||
249 | /* 2. Restore the state */ | |
250 | err = __get_user(regs->y, &sf->info.si_regs.y); | |
251 | err |= __get_user(psr, &sf->info.si_regs.psr); | |
252 | ||
253 | for (i = UREG_G1; i <= UREG_I7; i++) | |
254 | err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
255 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
256 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
257 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
258 | unsigned long asi; | |
259 | ||
260 | for (i = UREG_G1; i <= UREG_I7; i++) | |
261 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
262 | err |= __get_user(asi, &sf->v8plus.asi); | |
263 | regs->tstate &= ~TSTATE_ASI; | |
264 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
265 | } | |
266 | } | |
267 | ||
268 | /* User can only change condition codes in %tstate. */ | |
269 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
270 | regs->tstate |= psr_to_tstate_icc(psr); | |
271 | ||
2678fefe | 272 | /* Prevent syscall restart. */ |
28e61036 | 273 | pt_regs_clear_syscall(regs); |
2678fefe | 274 | |
1da177e4 LT |
275 | err |= __get_user(fpu_save, &sf->fpu_save); |
276 | if (fpu_save) | |
277 | err |= restore_fpu_state32(regs, &sf->fpu_state); | |
278 | err |= __get_user(seta[0], &sf->info.si_mask); | |
279 | err |= copy_from_user(seta+1, &sf->extramask, | |
280 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
281 | if (err) | |
282 | goto segv; | |
283 | switch (_NSIG_WORDS) { | |
284 | case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32); | |
285 | case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32); | |
286 | case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32); | |
287 | case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32); | |
288 | } | |
289 | sigdelsetmask(&set, ~_BLOCKABLE); | |
290 | spin_lock_irq(¤t->sighand->siglock); | |
291 | current->blocked = set; | |
292 | recalc_sigpending(); | |
293 | spin_unlock_irq(¤t->sighand->siglock); | |
294 | return; | |
295 | ||
296 | segv: | |
297 | force_sig(SIGSEGV, current); | |
298 | } | |
299 | ||
1da177e4 LT |
300 | asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
301 | { | |
302 | struct rt_signal_frame32 __user *sf; | |
303 | unsigned int psr, pc, npc, fpu_save, u_ss_sp; | |
304 | mm_segment_t old_fs; | |
305 | sigset_t set; | |
306 | compat_sigset_t seta; | |
307 | stack_t st; | |
308 | int err, i; | |
309 | ||
310 | /* Always make any pending restarted system calls return -EINTR */ | |
311 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
312 | ||
313 | synchronize_user_stack(); | |
314 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
315 | sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; | |
316 | ||
317 | /* 1. Make sure we are not getting garbage from the user */ | |
318 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
319 | (((unsigned long) sf) & 3)) | |
320 | goto segv; | |
321 | ||
322 | get_user(pc, &sf->regs.pc); | |
323 | __get_user(npc, &sf->regs.npc); | |
324 | ||
325 | if ((pc | npc) & 3) | |
326 | goto segv; | |
327 | ||
328 | if (test_thread_flag(TIF_32BIT)) { | |
329 | pc &= 0xffffffff; | |
330 | npc &= 0xffffffff; | |
331 | } | |
332 | regs->tpc = pc; | |
333 | regs->tnpc = npc; | |
334 | ||
335 | /* 2. Restore the state */ | |
336 | err = __get_user(regs->y, &sf->regs.y); | |
337 | err |= __get_user(psr, &sf->regs.psr); | |
338 | ||
339 | for (i = UREG_G1; i <= UREG_I7; i++) | |
340 | err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
341 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
342 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
343 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
344 | unsigned long asi; | |
345 | ||
346 | for (i = UREG_G1; i <= UREG_I7; i++) | |
347 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
348 | err |= __get_user(asi, &sf->v8plus.asi); | |
349 | regs->tstate &= ~TSTATE_ASI; | |
350 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
351 | } | |
352 | } | |
353 | ||
354 | /* User can only change condition codes in %tstate. */ | |
355 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
356 | regs->tstate |= psr_to_tstate_icc(psr); | |
357 | ||
2678fefe | 358 | /* Prevent syscall restart. */ |
28e61036 | 359 | pt_regs_clear_syscall(regs); |
2678fefe | 360 | |
1da177e4 LT |
361 | err |= __get_user(fpu_save, &sf->fpu_save); |
362 | if (fpu_save) | |
363 | err |= restore_fpu_state32(regs, &sf->fpu_state); | |
364 | err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t)); | |
365 | err |= __get_user(u_ss_sp, &sf->stack.ss_sp); | |
366 | st.ss_sp = compat_ptr(u_ss_sp); | |
367 | err |= __get_user(st.ss_flags, &sf->stack.ss_flags); | |
368 | err |= __get_user(st.ss_size, &sf->stack.ss_size); | |
369 | if (err) | |
370 | goto segv; | |
371 | ||
372 | /* It is more difficult to avoid calling this function than to | |
373 | call it and ignore errors. */ | |
374 | old_fs = get_fs(); | |
375 | set_fs(KERNEL_DS); | |
376 | do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf); | |
377 | set_fs(old_fs); | |
378 | ||
379 | switch (_NSIG_WORDS) { | |
380 | case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32); | |
381 | case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32); | |
382 | case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32); | |
383 | case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); | |
384 | } | |
385 | sigdelsetmask(&set, ~_BLOCKABLE); | |
386 | spin_lock_irq(¤t->sighand->siglock); | |
387 | current->blocked = set; | |
388 | recalc_sigpending(); | |
389 | spin_unlock_irq(¤t->sighand->siglock); | |
390 | return; | |
391 | segv: | |
392 | force_sig(SIGSEGV, current); | |
393 | } | |
394 | ||
395 | /* Checks if the fp is valid */ | |
396 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
397 | { | |
398 | if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen) | |
399 | return 1; | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) | |
404 | { | |
405 | unsigned long sp; | |
406 | ||
407 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
408 | sp = regs->u_regs[UREG_FP]; | |
409 | ||
dc5dc7e6 DM |
410 | /* |
411 | * If we are on the alternate signal stack and would overflow it, don't. | |
412 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
413 | */ | |
414 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) | |
415 | return (void __user *) -1L; | |
416 | ||
1da177e4 LT |
417 | /* This is the X/Open sanctioned signal stack switching. */ |
418 | if (sa->sa_flags & SA_ONSTACK) { | |
dc5dc7e6 | 419 | if (sas_ss_flags(sp) == 0) |
1da177e4 LT |
420 | sp = current->sas_ss_sp + current->sas_ss_size; |
421 | } | |
dc5dc7e6 | 422 | |
f036d9f3 DM |
423 | sp -= framesize; |
424 | ||
dc5dc7e6 DM |
425 | /* Always align the stack frame. This handles two cases. First, |
426 | * sigaltstack need not be mindful of platform specific stack | |
427 | * alignment. Second, if we took this signal because the stack | |
428 | * is not aligned properly, we'd like to take the signal cleanly | |
429 | * and report that. | |
430 | */ | |
f036d9f3 | 431 | sp &= ~15UL; |
dc5dc7e6 | 432 | |
f036d9f3 | 433 | return (void __user *) sp; |
1da177e4 LT |
434 | } |
435 | ||
1da177e4 LT |
436 | static int save_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) |
437 | { | |
438 | unsigned long *fpregs = current_thread_info()->fpregs; | |
439 | unsigned long fprs; | |
440 | int err = 0; | |
441 | ||
442 | fprs = current_thread_info()->fpsaved[0]; | |
443 | if (fprs & FPRS_DL) | |
444 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
445 | (sizeof(unsigned int) * 32)); | |
446 | if (fprs & FPRS_DU) | |
447 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
448 | (sizeof(unsigned int) * 32)); | |
449 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
450 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
451 | err |= __put_user(fprs, &fpu->si_fprs); | |
452 | ||
453 | return err; | |
454 | } | |
455 | ||
5526b7e4 DM |
456 | static void setup_frame32(struct k_sigaction *ka, struct pt_regs *regs, |
457 | int signo, sigset_t *oldset) | |
1da177e4 | 458 | { |
5526b7e4 | 459 | struct signal_frame32 __user *sf; |
1da177e4 LT |
460 | int sigframe_size; |
461 | u32 psr; | |
462 | int i, err; | |
463 | unsigned int seta[_COMPAT_NSIG_WORDS]; | |
464 | ||
465 | /* 1. Make sure everything is clean */ | |
466 | synchronize_user_stack(); | |
467 | save_and_clear_fpu(); | |
468 | ||
5526b7e4 | 469 | sigframe_size = SF_ALIGNEDSZ; |
1da177e4 LT |
470 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) |
471 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
472 | ||
5526b7e4 | 473 | sf = (struct signal_frame32 __user *) |
1da177e4 LT |
474 | get_sigframe(&ka->sa, regs, sigframe_size); |
475 | ||
476 | if (invalid_frame_pointer(sf, sigframe_size)) | |
477 | goto sigill; | |
478 | ||
479 | if (get_thread_wsaved() != 0) | |
480 | goto sigill; | |
481 | ||
482 | /* 2. Save the current process state */ | |
483 | if (test_thread_flag(TIF_32BIT)) { | |
484 | regs->tpc &= 0xffffffff; | |
485 | regs->tnpc &= 0xffffffff; | |
486 | } | |
487 | err = put_user(regs->tpc, &sf->info.si_regs.pc); | |
488 | err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); | |
489 | err |= __put_user(regs->y, &sf->info.si_regs.y); | |
490 | psr = tstate_to_psr(regs->tstate); | |
491 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
492 | psr |= PSR_EF; | |
493 | err |= __put_user(psr, &sf->info.si_regs.psr); | |
494 | for (i = 0; i < 16; i++) | |
495 | err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
496 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
497 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
498 | for (i = 1; i < 16; i++) | |
499 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
500 | &sf->v8plus.g_upper[i]); | |
501 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
502 | &sf->v8plus.asi); | |
503 | ||
504 | if (psr & PSR_EF) { | |
505 | err |= save_fpu_state32(regs, &sf->fpu_state); | |
506 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
507 | } else { | |
508 | err |= __put_user(0, &sf->fpu_save); | |
509 | } | |
510 | ||
511 | switch (_NSIG_WORDS) { | |
512 | case 4: seta[7] = (oldset->sig[3] >> 32); | |
513 | seta[6] = oldset->sig[3]; | |
514 | case 3: seta[5] = (oldset->sig[2] >> 32); | |
515 | seta[4] = oldset->sig[2]; | |
516 | case 2: seta[3] = (oldset->sig[1] >> 32); | |
517 | seta[2] = oldset->sig[1]; | |
518 | case 1: seta[1] = (oldset->sig[0] >> 32); | |
519 | seta[0] = oldset->sig[0]; | |
520 | } | |
521 | err |= __put_user(seta[0], &sf->info.si_mask); | |
522 | err |= __copy_to_user(sf->extramask, seta + 1, | |
523 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
524 | ||
525 | err |= copy_in_user((u32 __user *)sf, | |
526 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
527 | sizeof(struct reg_window32)); | |
528 | ||
529 | if (err) | |
530 | goto sigsegv; | |
531 | ||
532 | /* 3. signal handler back-trampoline and parameters */ | |
533 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
534 | regs->u_regs[UREG_I0] = signo; | |
535 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
536 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
537 | ||
538 | /* 4. signal handler */ | |
539 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
540 | regs->tnpc = (regs->tpc + 4); | |
541 | if (test_thread_flag(TIF_32BIT)) { | |
542 | regs->tpc &= 0xffffffff; | |
543 | regs->tnpc &= 0xffffffff; | |
544 | } | |
545 | ||
546 | /* 5. return to kernel instructions */ | |
547 | if (ka->ka_restorer) { | |
548 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
549 | } else { | |
550 | /* Flush instruction space. */ | |
551 | unsigned long address = ((unsigned long)&(sf->insns[0])); | |
552 | pgd_t *pgdp = pgd_offset(current->mm, address); | |
553 | pud_t *pudp = pud_offset(pgdp, address); | |
554 | pmd_t *pmdp = pmd_offset(pudp, address); | |
555 | pte_t *ptep; | |
b8ae4865 | 556 | pte_t pte; |
1da177e4 LT |
557 | |
558 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
559 | ||
560 | err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ | |
561 | err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ | |
562 | if (err) | |
563 | goto sigsegv; | |
564 | ||
565 | preempt_disable(); | |
566 | ptep = pte_offset_map(pmdp, address); | |
b8ae4865 HD |
567 | pte = *ptep; |
568 | if (pte_present(pte)) { | |
1da177e4 | 569 | unsigned long page = (unsigned long) |
b8ae4865 | 570 | page_address(pte_page(pte)); |
1da177e4 | 571 | |
4f07118f DM |
572 | wmb(); |
573 | __asm__ __volatile__("flush %0 + %1" | |
574 | : /* no outputs */ | |
575 | : "r" (page), | |
576 | "r" (address & (PAGE_SIZE - 1)) | |
577 | : "memory"); | |
1da177e4 LT |
578 | } |
579 | pte_unmap(ptep); | |
580 | preempt_enable(); | |
581 | } | |
582 | return; | |
583 | ||
584 | sigill: | |
585 | do_exit(SIGILL); | |
586 | sigsegv: | |
587 | force_sigsegv(signo, current); | |
588 | } | |
589 | ||
1da177e4 LT |
590 | static void setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs, |
591 | unsigned long signr, sigset_t *oldset, | |
592 | siginfo_t *info) | |
593 | { | |
594 | struct rt_signal_frame32 __user *sf; | |
595 | int sigframe_size; | |
596 | u32 psr; | |
597 | int i, err; | |
598 | compat_sigset_t seta; | |
599 | ||
600 | /* 1. Make sure everything is clean */ | |
601 | synchronize_user_stack(); | |
602 | save_and_clear_fpu(); | |
603 | ||
604 | sigframe_size = RT_ALIGNEDSZ; | |
605 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) | |
606 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
607 | ||
608 | sf = (struct rt_signal_frame32 __user *) | |
609 | get_sigframe(&ka->sa, regs, sigframe_size); | |
610 | ||
611 | if (invalid_frame_pointer(sf, sigframe_size)) | |
612 | goto sigill; | |
613 | ||
614 | if (get_thread_wsaved() != 0) | |
615 | goto sigill; | |
616 | ||
617 | /* 2. Save the current process state */ | |
618 | if (test_thread_flag(TIF_32BIT)) { | |
619 | regs->tpc &= 0xffffffff; | |
620 | regs->tnpc &= 0xffffffff; | |
621 | } | |
622 | err = put_user(regs->tpc, &sf->regs.pc); | |
623 | err |= __put_user(regs->tnpc, &sf->regs.npc); | |
624 | err |= __put_user(regs->y, &sf->regs.y); | |
625 | psr = tstate_to_psr(regs->tstate); | |
626 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
627 | psr |= PSR_EF; | |
628 | err |= __put_user(psr, &sf->regs.psr); | |
629 | for (i = 0; i < 16; i++) | |
630 | err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
631 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
632 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
633 | for (i = 1; i < 16; i++) | |
634 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
635 | &sf->v8plus.g_upper[i]); | |
636 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
637 | &sf->v8plus.asi); | |
638 | ||
639 | if (psr & PSR_EF) { | |
640 | err |= save_fpu_state32(regs, &sf->fpu_state); | |
641 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
642 | } else { | |
643 | err |= __put_user(0, &sf->fpu_save); | |
644 | } | |
645 | ||
646 | /* Update the siginfo structure. */ | |
647 | err |= copy_siginfo_to_user32(&sf->info, info); | |
648 | ||
649 | /* Setup sigaltstack */ | |
650 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
651 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
652 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
653 | ||
654 | switch (_NSIG_WORDS) { | |
655 | case 4: seta.sig[7] = (oldset->sig[3] >> 32); | |
656 | seta.sig[6] = oldset->sig[3]; | |
657 | case 3: seta.sig[5] = (oldset->sig[2] >> 32); | |
658 | seta.sig[4] = oldset->sig[2]; | |
659 | case 2: seta.sig[3] = (oldset->sig[1] >> 32); | |
660 | seta.sig[2] = oldset->sig[1]; | |
661 | case 1: seta.sig[1] = (oldset->sig[0] >> 32); | |
662 | seta.sig[0] = oldset->sig[0]; | |
663 | } | |
664 | err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t)); | |
665 | ||
666 | err |= copy_in_user((u32 __user *)sf, | |
667 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
668 | sizeof(struct reg_window32)); | |
669 | if (err) | |
670 | goto sigsegv; | |
671 | ||
672 | /* 3. signal handler back-trampoline and parameters */ | |
673 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
674 | regs->u_regs[UREG_I0] = signr; | |
675 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
676 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
677 | ||
678 | /* 4. signal handler */ | |
679 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
680 | regs->tnpc = (regs->tpc + 4); | |
681 | if (test_thread_flag(TIF_32BIT)) { | |
682 | regs->tpc &= 0xffffffff; | |
683 | regs->tnpc &= 0xffffffff; | |
684 | } | |
685 | ||
686 | /* 5. return to kernel instructions */ | |
687 | if (ka->ka_restorer) | |
688 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
689 | else { | |
690 | /* Flush instruction space. */ | |
691 | unsigned long address = ((unsigned long)&(sf->insns[0])); | |
692 | pgd_t *pgdp = pgd_offset(current->mm, address); | |
693 | pud_t *pudp = pud_offset(pgdp, address); | |
694 | pmd_t *pmdp = pmd_offset(pudp, address); | |
695 | pte_t *ptep; | |
696 | ||
697 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
698 | ||
699 | /* mov __NR_rt_sigreturn, %g1 */ | |
700 | err |= __put_user(0x82102065, &sf->insns[0]); | |
701 | ||
702 | /* t 0x10 */ | |
703 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
704 | if (err) | |
705 | goto sigsegv; | |
706 | ||
707 | preempt_disable(); | |
708 | ptep = pte_offset_map(pmdp, address); | |
709 | if (pte_present(*ptep)) { | |
710 | unsigned long page = (unsigned long) | |
711 | page_address(pte_page(*ptep)); | |
712 | ||
4f07118f DM |
713 | wmb(); |
714 | __asm__ __volatile__("flush %0 + %1" | |
715 | : /* no outputs */ | |
716 | : "r" (page), | |
717 | "r" (address & (PAGE_SIZE - 1)) | |
718 | : "memory"); | |
1da177e4 LT |
719 | } |
720 | pte_unmap(ptep); | |
721 | preempt_enable(); | |
722 | } | |
723 | return; | |
724 | ||
725 | sigill: | |
726 | do_exit(SIGILL); | |
727 | sigsegv: | |
728 | force_sigsegv(signr, current); | |
729 | } | |
730 | ||
731 | static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka, | |
732 | siginfo_t *info, | |
ec98c6b9 | 733 | sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 734 | { |
ec98c6b9 DM |
735 | if (ka->sa.sa_flags & SA_SIGINFO) |
736 | setup_rt_frame32(ka, regs, signr, oldset, info); | |
ec98c6b9 | 737 | else |
5526b7e4 DM |
738 | setup_frame32(ka, regs, signr, oldset); |
739 | ||
69be8f18 SR |
740 | spin_lock_irq(¤t->sighand->siglock); |
741 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
742 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 743 | sigaddset(¤t->blocked,signr); |
69be8f18 SR |
744 | recalc_sigpending(); |
745 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
746 | } |
747 | ||
748 | static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, | |
749 | struct sigaction *sa) | |
750 | { | |
751 | switch (regs->u_regs[UREG_I0]) { | |
752 | case ERESTART_RESTARTBLOCK: | |
753 | case ERESTARTNOHAND: | |
754 | no_system_call_restart: | |
755 | regs->u_regs[UREG_I0] = EINTR; | |
756 | regs->tstate |= TSTATE_ICARRY; | |
757 | break; | |
758 | case ERESTARTSYS: | |
759 | if (!(sa->sa_flags & SA_RESTART)) | |
760 | goto no_system_call_restart; | |
761 | /* fallthrough */ | |
762 | case ERESTARTNOINTR: | |
763 | regs->u_regs[UREG_I0] = orig_i0; | |
764 | regs->tpc -= 4; | |
765 | regs->tnpc -= 4; | |
766 | } | |
767 | } | |
768 | ||
769 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
770 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
771 | * mistake. | |
772 | */ | |
2d7d5f05 | 773 | void do_signal32(sigset_t *oldset, struct pt_regs * regs, |
28e61036 | 774 | int restart_syscall, unsigned long orig_i0) |
1da177e4 | 775 | { |
1da177e4 | 776 | struct k_sigaction ka; |
238468b2 | 777 | siginfo_t info; |
1da177e4 | 778 | int signr; |
1da177e4 | 779 | |
28e61036 DM |
780 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
781 | ||
782 | /* If the debugger messes with the program counter, it clears | |
783 | * the "in syscall" bit, directing us to not perform a syscall | |
784 | * restart. | |
785 | */ | |
786 | if (restart_syscall && !pt_regs_is_syscall(regs)) | |
787 | restart_syscall = 0; | |
788 | ||
1da177e4 | 789 | if (signr > 0) { |
28e61036 DM |
790 | if (restart_syscall) |
791 | syscall_restart32(orig_i0, regs, &ka.sa); | |
ec98c6b9 | 792 | handle_signal32(signr, &ka, &info, oldset, regs); |
2d7d5f05 | 793 | |
9a28dbf8 | 794 | /* A signal was successfully delivered; the saved |
2d7d5f05 DM |
795 | * sigmask will have been stored in the signal frame, |
796 | * and will be restored by sigreturn, so we can simply | |
9a28dbf8 | 797 | * clear the TS_RESTORE_SIGMASK flag. |
2d7d5f05 | 798 | */ |
9a28dbf8 | 799 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
95698466 RM |
800 | |
801 | tracehook_signal_handler(signr, &info, &ka, regs, 0); | |
2d7d5f05 | 802 | return; |
1da177e4 | 803 | } |
28e61036 | 804 | if (restart_syscall && |
1da177e4 LT |
805 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || |
806 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
807 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
808 | /* replay the system call when we are done */ | |
28e61036 | 809 | regs->u_regs[UREG_I0] = orig_i0; |
1da177e4 LT |
810 | regs->tpc -= 4; |
811 | regs->tnpc -= 4; | |
812 | } | |
28e61036 | 813 | if (restart_syscall && |
1da177e4 LT |
814 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { |
815 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
816 | regs->tpc -= 4; | |
817 | regs->tnpc -= 4; | |
818 | } | |
2d7d5f05 | 819 | |
9a28dbf8 | 820 | /* If there's no signal to deliver, we just put the saved sigmask |
2d7d5f05 DM |
821 | * back |
822 | */ | |
9a28dbf8 DM |
823 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
824 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
2d7d5f05 DM |
825 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
826 | } | |
1da177e4 LT |
827 | } |
828 | ||
829 | struct sigstack32 { | |
830 | u32 the_stack; | |
831 | int cur_status; | |
832 | }; | |
833 | ||
834 | asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) | |
835 | { | |
836 | struct sigstack32 __user *ssptr = | |
837 | (struct sigstack32 __user *)((unsigned long)(u_ssptr)); | |
838 | struct sigstack32 __user *ossptr = | |
839 | (struct sigstack32 __user *)((unsigned long)(u_ossptr)); | |
840 | int ret = -EFAULT; | |
841 | ||
842 | /* First see if old state is wanted. */ | |
843 | if (ossptr) { | |
844 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
845 | &ossptr->the_stack) || | |
846 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
847 | goto out; | |
848 | } | |
849 | ||
850 | /* Now see if we want to update the new state. */ | |
851 | if (ssptr) { | |
852 | u32 ss_sp; | |
853 | ||
854 | if (get_user(ss_sp, &ssptr->the_stack)) | |
855 | goto out; | |
856 | ||
857 | /* If the current stack was set with sigaltstack, don't | |
858 | * swap stacks while we are on it. | |
859 | */ | |
860 | ret = -EPERM; | |
861 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
862 | goto out; | |
863 | ||
864 | /* Since we don't know the extent of the stack, and we don't | |
865 | * track onstack-ness, but rather calculate it, we must | |
866 | * presume a size. Ho hum this interface is lossy. | |
867 | */ | |
868 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
869 | current->sas_ss_size = SIGSTKSZ; | |
870 | } | |
871 | ||
872 | ret = 0; | |
873 | out: | |
874 | return ret; | |
875 | } | |
876 | ||
877 | asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp) | |
878 | { | |
879 | stack_t uss, uoss; | |
880 | u32 u_ss_sp = 0; | |
881 | int ret; | |
882 | mm_segment_t old_fs; | |
883 | stack_t32 __user *uss32 = compat_ptr(ussa); | |
884 | stack_t32 __user *uoss32 = compat_ptr(uossa); | |
885 | ||
886 | if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) || | |
887 | __get_user(uss.ss_flags, &uss32->ss_flags) || | |
888 | __get_user(uss.ss_size, &uss32->ss_size))) | |
889 | return -EFAULT; | |
890 | uss.ss_sp = compat_ptr(u_ss_sp); | |
891 | old_fs = get_fs(); | |
892 | set_fs(KERNEL_DS); | |
893 | ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL, | |
894 | uossa ? (stack_t __user *) &uoss : NULL, sp); | |
895 | set_fs(old_fs); | |
896 | if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) || | |
897 | __put_user(uoss.ss_flags, &uoss32->ss_flags) || | |
898 | __put_user(uoss.ss_size, &uoss32->ss_size))) | |
899 | return -EFAULT; | |
900 | return ret; | |
901 | } |