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 | 31 | |
5598473a DM |
32 | #include "sigutil.h" |
33 | ||
1da177e4 LT |
34 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
35 | ||
1da177e4 LT |
36 | /* This magic should be in g_upper[0] for all upper parts |
37 | * to be valid. | |
38 | */ | |
39 | #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 | |
40 | typedef struct { | |
41 | unsigned int g_upper[8]; | |
42 | unsigned int o_upper[8]; | |
43 | unsigned int asi; | |
44 | } siginfo_extra_v8plus_t; | |
45 | ||
5526b7e4 | 46 | struct signal_frame32 { |
1da177e4 LT |
47 | struct sparc_stackf32 ss; |
48 | __siginfo32_t info; | |
5598473a | 49 | /* __siginfo_fpu_t * */ u32 fpu_save; |
1da177e4 LT |
50 | unsigned int insns[2]; |
51 | unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; | |
52 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ | |
53 | /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
54 | siginfo_extra_v8plus_t v8plus; | |
5598473a DM |
55 | /* __siginfo_rwin_t * */u32 rwin_save; |
56 | } __attribute__((aligned(8))); | |
1da177e4 LT |
57 | |
58 | typedef struct compat_siginfo{ | |
59 | int si_signo; | |
60 | int si_errno; | |
61 | int si_code; | |
62 | ||
63 | union { | |
64 | int _pad[SI_PAD_SIZE32]; | |
65 | ||
66 | /* kill() */ | |
67 | struct { | |
68 | compat_pid_t _pid; /* sender's pid */ | |
69 | unsigned int _uid; /* sender's uid */ | |
70 | } _kill; | |
71 | ||
72 | /* POSIX.1b timers */ | |
73 | struct { | |
0d77e5a2 | 74 | compat_timer_t _tid; /* timer id */ |
1da177e4 LT |
75 | int _overrun; /* overrun count */ |
76 | compat_sigval_t _sigval; /* same as below */ | |
77 | int _sys_private; /* not to be passed to user */ | |
78 | } _timer; | |
79 | ||
80 | /* POSIX.1b signals */ | |
81 | struct { | |
82 | compat_pid_t _pid; /* sender's pid */ | |
83 | unsigned int _uid; /* sender's uid */ | |
84 | compat_sigval_t _sigval; | |
85 | } _rt; | |
86 | ||
87 | /* SIGCHLD */ | |
88 | struct { | |
89 | compat_pid_t _pid; /* which child */ | |
90 | unsigned int _uid; /* sender's uid */ | |
91 | int _status; /* exit code */ | |
92 | compat_clock_t _utime; | |
93 | compat_clock_t _stime; | |
94 | } _sigchld; | |
95 | ||
96 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */ | |
97 | struct { | |
98 | u32 _addr; /* faulting insn/memory ref. */ | |
99 | int _trapno; | |
100 | } _sigfault; | |
101 | ||
102 | /* SIGPOLL */ | |
103 | struct { | |
104 | int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ | |
105 | int _fd; | |
106 | } _sigpoll; | |
107 | } _sifields; | |
108 | }compat_siginfo_t; | |
109 | ||
110 | struct rt_signal_frame32 { | |
111 | struct sparc_stackf32 ss; | |
112 | compat_siginfo_t info; | |
113 | struct pt_regs32 regs; | |
114 | compat_sigset_t mask; | |
5598473a | 115 | /* __siginfo_fpu_t * */ u32 fpu_save; |
1da177e4 LT |
116 | unsigned int insns[2]; |
117 | stack_t32 stack; | |
118 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ | |
119 | /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
120 | siginfo_extra_v8plus_t v8plus; | |
5598473a DM |
121 | /* __siginfo_rwin_t * */u32 rwin_save; |
122 | } __attribute__((aligned(8))); | |
1da177e4 LT |
123 | |
124 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
125 | { | |
126 | int err; | |
127 | ||
128 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
129 | return -EFAULT; | |
130 | ||
131 | /* If you change siginfo_t structure, please be sure | |
132 | this code is fixed accordingly. | |
133 | It should never copy any pad contained in the structure | |
134 | to avoid security leaks, but must copy the generic | |
135 | 3 ints plus the relevant union member. | |
136 | This routine must convert siginfo from 64bit to 32bit as well | |
137 | at the same time. */ | |
138 | err = __put_user(from->si_signo, &to->si_signo); | |
139 | err |= __put_user(from->si_errno, &to->si_errno); | |
140 | err |= __put_user((short)from->si_code, &to->si_code); | |
141 | if (from->si_code < 0) | |
142 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
143 | else { | |
144 | switch (from->si_code >> 16) { | |
145 | case __SI_TIMER >> 16: | |
146 | err |= __put_user(from->si_tid, &to->si_tid); | |
147 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
148 | err |= __put_user(from->si_int, &to->si_int); | |
149 | break; | |
150 | case __SI_CHLD >> 16: | |
151 | err |= __put_user(from->si_utime, &to->si_utime); | |
152 | err |= __put_user(from->si_stime, &to->si_stime); | |
153 | err |= __put_user(from->si_status, &to->si_status); | |
154 | default: | |
155 | err |= __put_user(from->si_pid, &to->si_pid); | |
156 | err |= __put_user(from->si_uid, &to->si_uid); | |
157 | break; | |
158 | case __SI_FAULT >> 16: | |
1da177e4 LT |
159 | err |= __put_user(from->si_trapno, &to->si_trapno); |
160 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); | |
161 | break; | |
9c7d3b3a JS |
162 | case __SI_POLL >> 16: |
163 | err |= __put_user(from->si_band, &to->si_band); | |
164 | err |= __put_user(from->si_fd, &to->si_fd); | |
165 | break; | |
1da177e4 LT |
166 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
167 | case __SI_MESGQ >> 16: | |
168 | err |= __put_user(from->si_pid, &to->si_pid); | |
169 | err |= __put_user(from->si_uid, &to->si_uid); | |
170 | err |= __put_user(from->si_int, &to->si_int); | |
171 | break; | |
172 | } | |
173 | } | |
174 | return err; | |
175 | } | |
176 | ||
177 | /* CAUTION: This is just a very minimalist implementation for the | |
178 | * sake of compat_sys_rt_sigqueueinfo() | |
179 | */ | |
180 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
181 | { | |
182 | if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) | |
183 | return -EFAULT; | |
184 | ||
185 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
186 | copy_from_user(to->_sifields._pad, from->_sifields._pad, | |
187 | SI_PAD_SIZE)) | |
188 | return -EFAULT; | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
5526b7e4 | 193 | void do_sigreturn32(struct pt_regs *regs) |
1da177e4 | 194 | { |
5526b7e4 | 195 | struct signal_frame32 __user *sf; |
5598473a DM |
196 | compat_uptr_t fpu_save; |
197 | compat_uptr_t rwin_save; | |
1da177e4 | 198 | unsigned int psr; |
5598473a | 199 | unsigned pc, npc; |
1da177e4 LT |
200 | sigset_t set; |
201 | unsigned seta[_COMPAT_NSIG_WORDS]; | |
202 | int err, i; | |
203 | ||
5526b7e4 DM |
204 | /* Always make any pending restarted system calls return -EINTR */ |
205 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
206 | ||
207 | synchronize_user_stack(); | |
208 | ||
1da177e4 | 209 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
5526b7e4 | 210 | sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; |
1da177e4 LT |
211 | |
212 | /* 1. Make sure we are not getting garbage from the user */ | |
213 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
214 | (((unsigned long) sf) & 3)) | |
215 | goto segv; | |
216 | ||
217 | get_user(pc, &sf->info.si_regs.pc); | |
218 | __get_user(npc, &sf->info.si_regs.npc); | |
219 | ||
220 | if ((pc | npc) & 3) | |
221 | goto segv; | |
222 | ||
223 | if (test_thread_flag(TIF_32BIT)) { | |
224 | pc &= 0xffffffff; | |
225 | npc &= 0xffffffff; | |
226 | } | |
227 | regs->tpc = pc; | |
228 | regs->tnpc = npc; | |
229 | ||
230 | /* 2. Restore the state */ | |
231 | err = __get_user(regs->y, &sf->info.si_regs.y); | |
232 | err |= __get_user(psr, &sf->info.si_regs.psr); | |
233 | ||
234 | for (i = UREG_G1; i <= UREG_I7; i++) | |
235 | err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
236 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
237 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
238 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
239 | unsigned long asi; | |
240 | ||
241 | for (i = UREG_G1; i <= UREG_I7; i++) | |
242 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
243 | err |= __get_user(asi, &sf->v8plus.asi); | |
244 | regs->tstate &= ~TSTATE_ASI; | |
245 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
246 | } | |
247 | } | |
248 | ||
249 | /* User can only change condition codes in %tstate. */ | |
250 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
251 | regs->tstate |= psr_to_tstate_icc(psr); | |
252 | ||
2678fefe | 253 | /* Prevent syscall restart. */ |
28e61036 | 254 | pt_regs_clear_syscall(regs); |
2678fefe | 255 | |
1da177e4 | 256 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
257 | if (!err && fpu_save) |
258 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
259 | err |= __get_user(rwin_save, &sf->rwin_save); | |
260 | if (!err && rwin_save) { | |
261 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
262 | goto segv; | |
263 | } | |
1da177e4 LT |
264 | err |= __get_user(seta[0], &sf->info.si_mask); |
265 | err |= copy_from_user(seta+1, &sf->extramask, | |
266 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
267 | if (err) | |
268 | goto segv; | |
269 | switch (_NSIG_WORDS) { | |
270 | case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32); | |
271 | case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32); | |
272 | case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32); | |
273 | case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32); | |
274 | } | |
275 | sigdelsetmask(&set, ~_BLOCKABLE); | |
faddf598 | 276 | set_current_blocked(&set); |
1da177e4 LT |
277 | return; |
278 | ||
279 | segv: | |
280 | force_sig(SIGSEGV, current); | |
281 | } | |
282 | ||
1da177e4 LT |
283 | asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
284 | { | |
285 | struct rt_signal_frame32 __user *sf; | |
5598473a DM |
286 | unsigned int psr, pc, npc, u_ss_sp; |
287 | compat_uptr_t fpu_save; | |
288 | compat_uptr_t rwin_save; | |
1da177e4 LT |
289 | mm_segment_t old_fs; |
290 | sigset_t set; | |
291 | compat_sigset_t seta; | |
292 | stack_t st; | |
293 | int err, i; | |
294 | ||
295 | /* Always make any pending restarted system calls return -EINTR */ | |
296 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
297 | ||
298 | synchronize_user_stack(); | |
299 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
300 | sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; | |
301 | ||
302 | /* 1. Make sure we are not getting garbage from the user */ | |
303 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
304 | (((unsigned long) sf) & 3)) | |
305 | goto segv; | |
306 | ||
307 | get_user(pc, &sf->regs.pc); | |
308 | __get_user(npc, &sf->regs.npc); | |
309 | ||
310 | if ((pc | npc) & 3) | |
311 | goto segv; | |
312 | ||
313 | if (test_thread_flag(TIF_32BIT)) { | |
314 | pc &= 0xffffffff; | |
315 | npc &= 0xffffffff; | |
316 | } | |
317 | regs->tpc = pc; | |
318 | regs->tnpc = npc; | |
319 | ||
320 | /* 2. Restore the state */ | |
321 | err = __get_user(regs->y, &sf->regs.y); | |
322 | err |= __get_user(psr, &sf->regs.psr); | |
323 | ||
324 | for (i = UREG_G1; i <= UREG_I7; i++) | |
325 | err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
326 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
327 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
328 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
329 | unsigned long asi; | |
330 | ||
331 | for (i = UREG_G1; i <= UREG_I7; i++) | |
332 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
333 | err |= __get_user(asi, &sf->v8plus.asi); | |
334 | regs->tstate &= ~TSTATE_ASI; | |
335 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
336 | } | |
337 | } | |
338 | ||
339 | /* User can only change condition codes in %tstate. */ | |
340 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
341 | regs->tstate |= psr_to_tstate_icc(psr); | |
342 | ||
2678fefe | 343 | /* Prevent syscall restart. */ |
28e61036 | 344 | pt_regs_clear_syscall(regs); |
2678fefe | 345 | |
1da177e4 | 346 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
347 | if (!err && fpu_save) |
348 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
1da177e4 LT |
349 | err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t)); |
350 | err |= __get_user(u_ss_sp, &sf->stack.ss_sp); | |
351 | st.ss_sp = compat_ptr(u_ss_sp); | |
352 | err |= __get_user(st.ss_flags, &sf->stack.ss_flags); | |
353 | err |= __get_user(st.ss_size, &sf->stack.ss_size); | |
354 | if (err) | |
355 | goto segv; | |
356 | ||
357 | /* It is more difficult to avoid calling this function than to | |
358 | call it and ignore errors. */ | |
359 | old_fs = get_fs(); | |
360 | set_fs(KERNEL_DS); | |
361 | do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf); | |
362 | set_fs(old_fs); | |
363 | ||
5598473a DM |
364 | err |= __get_user(rwin_save, &sf->rwin_save); |
365 | if (!err && rwin_save) { | |
366 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
367 | goto segv; | |
368 | } | |
369 | ||
1da177e4 LT |
370 | switch (_NSIG_WORDS) { |
371 | case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32); | |
372 | case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32); | |
373 | case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32); | |
374 | case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); | |
375 | } | |
376 | sigdelsetmask(&set, ~_BLOCKABLE); | |
faddf598 | 377 | set_current_blocked(&set); |
1da177e4 LT |
378 | return; |
379 | segv: | |
380 | force_sig(SIGSEGV, current); | |
381 | } | |
382 | ||
383 | /* Checks if the fp is valid */ | |
384 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
385 | { | |
386 | if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen) | |
387 | return 1; | |
388 | return 0; | |
389 | } | |
390 | ||
391 | static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) | |
392 | { | |
393 | unsigned long sp; | |
394 | ||
395 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
396 | sp = regs->u_regs[UREG_FP]; | |
397 | ||
dc5dc7e6 DM |
398 | /* |
399 | * If we are on the alternate signal stack and would overflow it, don't. | |
400 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
401 | */ | |
402 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) | |
403 | return (void __user *) -1L; | |
404 | ||
1da177e4 LT |
405 | /* This is the X/Open sanctioned signal stack switching. */ |
406 | if (sa->sa_flags & SA_ONSTACK) { | |
dc5dc7e6 | 407 | if (sas_ss_flags(sp) == 0) |
1da177e4 LT |
408 | sp = current->sas_ss_sp + current->sas_ss_size; |
409 | } | |
dc5dc7e6 | 410 | |
f036d9f3 DM |
411 | sp -= framesize; |
412 | ||
dc5dc7e6 DM |
413 | /* Always align the stack frame. This handles two cases. First, |
414 | * sigaltstack need not be mindful of platform specific stack | |
415 | * alignment. Second, if we took this signal because the stack | |
416 | * is not aligned properly, we'd like to take the signal cleanly | |
417 | * and report that. | |
418 | */ | |
f036d9f3 | 419 | sp &= ~15UL; |
dc5dc7e6 | 420 | |
f036d9f3 | 421 | return (void __user *) sp; |
1da177e4 LT |
422 | } |
423 | ||
05c5e769 DM |
424 | /* The I-cache flush instruction only works in the primary ASI, which |
425 | * right now is the nucleus, aka. kernel space. | |
426 | * | |
427 | * Therefore we have to kick the instructions out using the kernel | |
428 | * side linear mapping of the physical address backing the user | |
429 | * instructions. | |
430 | */ | |
431 | static void flush_signal_insns(unsigned long address) | |
432 | { | |
433 | unsigned long pstate, paddr; | |
434 | pte_t *ptep, pte; | |
435 | pgd_t *pgdp; | |
436 | pud_t *pudp; | |
437 | pmd_t *pmdp; | |
438 | ||
439 | /* Commit all stores of the instructions we are about to flush. */ | |
440 | wmb(); | |
441 | ||
442 | /* Disable cross-call reception. In this way even a very wide | |
443 | * munmap() on another cpu can't tear down the page table | |
444 | * hierarchy from underneath us, since that can't complete | |
445 | * until the IPI tlb flush returns. | |
446 | */ | |
447 | ||
448 | __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); | |
449 | __asm__ __volatile__("wrpr %0, %1, %%pstate" | |
450 | : : "r" (pstate), "i" (PSTATE_IE)); | |
451 | ||
452 | pgdp = pgd_offset(current->mm, address); | |
453 | if (pgd_none(*pgdp)) | |
454 | goto out_irqs_on; | |
455 | pudp = pud_offset(pgdp, address); | |
456 | if (pud_none(*pudp)) | |
457 | goto out_irqs_on; | |
458 | pmdp = pmd_offset(pudp, address); | |
459 | if (pmd_none(*pmdp)) | |
460 | goto out_irqs_on; | |
461 | ||
462 | ptep = pte_offset_map(pmdp, address); | |
463 | pte = *ptep; | |
464 | if (!pte_present(pte)) | |
465 | goto out_unmap; | |
466 | ||
467 | paddr = (unsigned long) page_address(pte_page(pte)); | |
468 | ||
469 | __asm__ __volatile__("flush %0 + %1" | |
470 | : /* no outputs */ | |
471 | : "r" (paddr), | |
472 | "r" (address & (PAGE_SIZE - 1)) | |
473 | : "memory"); | |
474 | ||
475 | out_unmap: | |
476 | pte_unmap(ptep); | |
477 | out_irqs_on: | |
478 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); | |
479 | ||
480 | } | |
481 | ||
392c2180 DM |
482 | static int setup_frame32(struct k_sigaction *ka, struct pt_regs *regs, |
483 | int signo, sigset_t *oldset) | |
1da177e4 | 484 | { |
5526b7e4 | 485 | struct signal_frame32 __user *sf; |
5598473a DM |
486 | int i, err, wsaved; |
487 | void __user *tail; | |
1da177e4 LT |
488 | int sigframe_size; |
489 | u32 psr; | |
1da177e4 LT |
490 | unsigned int seta[_COMPAT_NSIG_WORDS]; |
491 | ||
492 | /* 1. Make sure everything is clean */ | |
493 | synchronize_user_stack(); | |
494 | save_and_clear_fpu(); | |
495 | ||
5598473a DM |
496 | wsaved = get_thread_wsaved(); |
497 | ||
498 | sigframe_size = sizeof(*sf); | |
499 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
500 | sigframe_size += sizeof(__siginfo_fpu_t); | |
501 | if (wsaved) | |
502 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 | 503 | |
5526b7e4 | 504 | sf = (struct signal_frame32 __user *) |
1da177e4 LT |
505 | get_sigframe(&ka->sa, regs, sigframe_size); |
506 | ||
507 | if (invalid_frame_pointer(sf, sigframe_size)) | |
508 | goto sigill; | |
509 | ||
5598473a | 510 | tail = (sf + 1); |
1da177e4 LT |
511 | |
512 | /* 2. Save the current process state */ | |
513 | if (test_thread_flag(TIF_32BIT)) { | |
514 | regs->tpc &= 0xffffffff; | |
515 | regs->tnpc &= 0xffffffff; | |
516 | } | |
517 | err = put_user(regs->tpc, &sf->info.si_regs.pc); | |
518 | err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); | |
519 | err |= __put_user(regs->y, &sf->info.si_regs.y); | |
520 | psr = tstate_to_psr(regs->tstate); | |
521 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
522 | psr |= PSR_EF; | |
523 | err |= __put_user(psr, &sf->info.si_regs.psr); | |
524 | for (i = 0; i < 16; i++) | |
525 | err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
526 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
527 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
528 | for (i = 1; i < 16; i++) | |
529 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
530 | &sf->v8plus.g_upper[i]); | |
531 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
532 | &sf->v8plus.asi); | |
533 | ||
534 | if (psr & PSR_EF) { | |
5598473a DM |
535 | __siginfo_fpu_t __user *fp = tail; |
536 | tail += sizeof(*fp); | |
537 | err |= save_fpu_state(regs, fp); | |
538 | err |= __put_user((u64)fp, &sf->fpu_save); | |
1da177e4 LT |
539 | } else { |
540 | err |= __put_user(0, &sf->fpu_save); | |
541 | } | |
5598473a DM |
542 | if (wsaved) { |
543 | __siginfo_rwin_t __user *rwp = tail; | |
544 | tail += sizeof(*rwp); | |
545 | err |= save_rwin_state(wsaved, rwp); | |
546 | err |= __put_user((u64)rwp, &sf->rwin_save); | |
547 | set_thread_wsaved(0); | |
548 | } else { | |
549 | err |= __put_user(0, &sf->rwin_save); | |
550 | } | |
1da177e4 LT |
551 | |
552 | switch (_NSIG_WORDS) { | |
553 | case 4: seta[7] = (oldset->sig[3] >> 32); | |
554 | seta[6] = oldset->sig[3]; | |
555 | case 3: seta[5] = (oldset->sig[2] >> 32); | |
556 | seta[4] = oldset->sig[2]; | |
557 | case 2: seta[3] = (oldset->sig[1] >> 32); | |
558 | seta[2] = oldset->sig[1]; | |
559 | case 1: seta[1] = (oldset->sig[0] >> 32); | |
560 | seta[0] = oldset->sig[0]; | |
561 | } | |
562 | err |= __put_user(seta[0], &sf->info.si_mask); | |
563 | err |= __copy_to_user(sf->extramask, seta + 1, | |
564 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
565 | ||
5598473a DM |
566 | if (!wsaved) { |
567 | err |= copy_in_user((u32 __user *)sf, | |
568 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
569 | sizeof(struct reg_window32)); | |
570 | } else { | |
571 | struct reg_window *rp; | |
572 | ||
573 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
574 | for (i = 0; i < 8; i++) | |
575 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); | |
576 | for (i = 0; i < 6; i++) | |
577 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); | |
578 | err |= __put_user(rp->ins[6], &sf->ss.fp); | |
579 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); | |
580 | } | |
1da177e4 LT |
581 | if (err) |
582 | goto sigsegv; | |
583 | ||
584 | /* 3. signal handler back-trampoline and parameters */ | |
585 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
586 | regs->u_regs[UREG_I0] = signo; | |
587 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
588 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
589 | ||
590 | /* 4. signal handler */ | |
591 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
592 | regs->tnpc = (regs->tpc + 4); | |
593 | if (test_thread_flag(TIF_32BIT)) { | |
594 | regs->tpc &= 0xffffffff; | |
595 | regs->tnpc &= 0xffffffff; | |
596 | } | |
597 | ||
598 | /* 5. return to kernel instructions */ | |
599 | if (ka->ka_restorer) { | |
600 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
601 | } else { | |
1da177e4 | 602 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
603 | |
604 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
605 | ||
606 | err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ | |
607 | err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ | |
608 | if (err) | |
609 | goto sigsegv; | |
05c5e769 | 610 | flush_signal_insns(address); |
1da177e4 | 611 | } |
c2785259 | 612 | return 0; |
1da177e4 LT |
613 | |
614 | sigill: | |
615 | do_exit(SIGILL); | |
392c2180 DM |
616 | return -EINVAL; |
617 | ||
1da177e4 LT |
618 | sigsegv: |
619 | force_sigsegv(signo, current); | |
392c2180 | 620 | return -EFAULT; |
1da177e4 LT |
621 | } |
622 | ||
392c2180 DM |
623 | static int setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs, |
624 | unsigned long signr, sigset_t *oldset, | |
625 | siginfo_t *info) | |
1da177e4 LT |
626 | { |
627 | struct rt_signal_frame32 __user *sf; | |
5598473a DM |
628 | int i, err, wsaved; |
629 | void __user *tail; | |
1da177e4 LT |
630 | int sigframe_size; |
631 | u32 psr; | |
1da177e4 LT |
632 | compat_sigset_t seta; |
633 | ||
634 | /* 1. Make sure everything is clean */ | |
635 | synchronize_user_stack(); | |
636 | save_and_clear_fpu(); | |
637 | ||
5598473a DM |
638 | wsaved = get_thread_wsaved(); |
639 | ||
640 | sigframe_size = sizeof(*sf); | |
641 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
642 | sigframe_size += sizeof(__siginfo_fpu_t); | |
643 | if (wsaved) | |
644 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 LT |
645 | |
646 | sf = (struct rt_signal_frame32 __user *) | |
647 | get_sigframe(&ka->sa, regs, sigframe_size); | |
648 | ||
649 | if (invalid_frame_pointer(sf, sigframe_size)) | |
650 | goto sigill; | |
651 | ||
5598473a | 652 | tail = (sf + 1); |
1da177e4 LT |
653 | |
654 | /* 2. Save the current process state */ | |
655 | if (test_thread_flag(TIF_32BIT)) { | |
656 | regs->tpc &= 0xffffffff; | |
657 | regs->tnpc &= 0xffffffff; | |
658 | } | |
659 | err = put_user(regs->tpc, &sf->regs.pc); | |
660 | err |= __put_user(regs->tnpc, &sf->regs.npc); | |
661 | err |= __put_user(regs->y, &sf->regs.y); | |
662 | psr = tstate_to_psr(regs->tstate); | |
663 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
664 | psr |= PSR_EF; | |
665 | err |= __put_user(psr, &sf->regs.psr); | |
666 | for (i = 0; i < 16; i++) | |
667 | err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
668 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
669 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
670 | for (i = 1; i < 16; i++) | |
671 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
672 | &sf->v8plus.g_upper[i]); | |
673 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
674 | &sf->v8plus.asi); | |
675 | ||
676 | if (psr & PSR_EF) { | |
5598473a DM |
677 | __siginfo_fpu_t __user *fp = tail; |
678 | tail += sizeof(*fp); | |
679 | err |= save_fpu_state(regs, fp); | |
680 | err |= __put_user((u64)fp, &sf->fpu_save); | |
1da177e4 LT |
681 | } else { |
682 | err |= __put_user(0, &sf->fpu_save); | |
683 | } | |
5598473a DM |
684 | if (wsaved) { |
685 | __siginfo_rwin_t __user *rwp = tail; | |
686 | tail += sizeof(*rwp); | |
687 | err |= save_rwin_state(wsaved, rwp); | |
688 | err |= __put_user((u64)rwp, &sf->rwin_save); | |
689 | set_thread_wsaved(0); | |
690 | } else { | |
691 | err |= __put_user(0, &sf->rwin_save); | |
692 | } | |
1da177e4 LT |
693 | |
694 | /* Update the siginfo structure. */ | |
695 | err |= copy_siginfo_to_user32(&sf->info, info); | |
696 | ||
697 | /* Setup sigaltstack */ | |
698 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
699 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
700 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
701 | ||
702 | switch (_NSIG_WORDS) { | |
703 | case 4: seta.sig[7] = (oldset->sig[3] >> 32); | |
704 | seta.sig[6] = oldset->sig[3]; | |
705 | case 3: seta.sig[5] = (oldset->sig[2] >> 32); | |
706 | seta.sig[4] = oldset->sig[2]; | |
707 | case 2: seta.sig[3] = (oldset->sig[1] >> 32); | |
708 | seta.sig[2] = oldset->sig[1]; | |
709 | case 1: seta.sig[1] = (oldset->sig[0] >> 32); | |
710 | seta.sig[0] = oldset->sig[0]; | |
711 | } | |
712 | err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t)); | |
713 | ||
5598473a DM |
714 | if (!wsaved) { |
715 | err |= copy_in_user((u32 __user *)sf, | |
716 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
717 | sizeof(struct reg_window32)); | |
718 | } else { | |
719 | struct reg_window *rp; | |
720 | ||
721 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
722 | for (i = 0; i < 8; i++) | |
723 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); | |
724 | for (i = 0; i < 6; i++) | |
725 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); | |
726 | err |= __put_user(rp->ins[6], &sf->ss.fp); | |
727 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); | |
728 | } | |
1da177e4 LT |
729 | if (err) |
730 | goto sigsegv; | |
731 | ||
732 | /* 3. signal handler back-trampoline and parameters */ | |
733 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
734 | regs->u_regs[UREG_I0] = signr; | |
735 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
736 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
737 | ||
738 | /* 4. signal handler */ | |
739 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
740 | regs->tnpc = (regs->tpc + 4); | |
741 | if (test_thread_flag(TIF_32BIT)) { | |
742 | regs->tpc &= 0xffffffff; | |
743 | regs->tnpc &= 0xffffffff; | |
744 | } | |
745 | ||
746 | /* 5. return to kernel instructions */ | |
747 | if (ka->ka_restorer) | |
748 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
749 | else { | |
1da177e4 | 750 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
751 | |
752 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
753 | ||
754 | /* mov __NR_rt_sigreturn, %g1 */ | |
755 | err |= __put_user(0x82102065, &sf->insns[0]); | |
756 | ||
757 | /* t 0x10 */ | |
758 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
759 | if (err) | |
760 | goto sigsegv; | |
761 | ||
05c5e769 | 762 | flush_signal_insns(address); |
1da177e4 | 763 | } |
392c2180 | 764 | return 0; |
1da177e4 LT |
765 | |
766 | sigill: | |
767 | do_exit(SIGILL); | |
392c2180 DM |
768 | return -EINVAL; |
769 | ||
1da177e4 LT |
770 | sigsegv: |
771 | force_sigsegv(signr, current); | |
392c2180 | 772 | return -EFAULT; |
1da177e4 LT |
773 | } |
774 | ||
392c2180 DM |
775 | static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka, |
776 | siginfo_t *info, | |
777 | sigset_t *oldset, struct pt_regs *regs) | |
1da177e4 | 778 | { |
faddf598 | 779 | sigset_t blocked; |
392c2180 DM |
780 | int err; |
781 | ||
ec98c6b9 | 782 | if (ka->sa.sa_flags & SA_SIGINFO) |
392c2180 | 783 | err = setup_rt_frame32(ka, regs, signr, oldset, info); |
ec98c6b9 | 784 | else |
392c2180 DM |
785 | err = setup_frame32(ka, regs, signr, oldset); |
786 | ||
787 | if (err) | |
788 | return err; | |
5526b7e4 | 789 | |
faddf598 | 790 | sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); |
69be8f18 | 791 | if (!(ka->sa.sa_flags & SA_NOMASK)) |
faddf598 MF |
792 | sigaddset(&blocked, signr); |
793 | set_current_blocked(&blocked); | |
392c2180 DM |
794 | |
795 | tracehook_signal_handler(signr, info, ka, regs, 0); | |
796 | ||
797 | return 0; | |
1da177e4 LT |
798 | } |
799 | ||
800 | static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, | |
801 | struct sigaction *sa) | |
802 | { | |
803 | switch (regs->u_regs[UREG_I0]) { | |
804 | case ERESTART_RESTARTBLOCK: | |
805 | case ERESTARTNOHAND: | |
806 | no_system_call_restart: | |
807 | regs->u_regs[UREG_I0] = EINTR; | |
808 | regs->tstate |= TSTATE_ICARRY; | |
809 | break; | |
810 | case ERESTARTSYS: | |
811 | if (!(sa->sa_flags & SA_RESTART)) | |
812 | goto no_system_call_restart; | |
813 | /* fallthrough */ | |
814 | case ERESTARTNOINTR: | |
815 | regs->u_regs[UREG_I0] = orig_i0; | |
816 | regs->tpc -= 4; | |
817 | regs->tnpc -= 4; | |
818 | } | |
819 | } | |
820 | ||
821 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
822 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
823 | * mistake. | |
824 | */ | |
2d7d5f05 | 825 | void do_signal32(sigset_t *oldset, struct pt_regs * regs, |
28e61036 | 826 | int restart_syscall, unsigned long orig_i0) |
1da177e4 | 827 | { |
1da177e4 | 828 | struct k_sigaction ka; |
238468b2 | 829 | siginfo_t info; |
1da177e4 | 830 | int signr; |
1da177e4 | 831 | |
28e61036 DM |
832 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
833 | ||
834 | /* If the debugger messes with the program counter, it clears | |
835 | * the "in syscall" bit, directing us to not perform a syscall | |
836 | * restart. | |
837 | */ | |
838 | if (restart_syscall && !pt_regs_is_syscall(regs)) | |
839 | restart_syscall = 0; | |
840 | ||
1da177e4 | 841 | if (signr > 0) { |
28e61036 DM |
842 | if (restart_syscall) |
843 | syscall_restart32(orig_i0, regs, &ka.sa); | |
392c2180 DM |
844 | if (handle_signal32(signr, &ka, &info, oldset, regs) == 0) { |
845 | /* A signal was successfully delivered; the saved | |
846 | * sigmask will have been stored in the signal frame, | |
847 | * and will be restored by sigreturn, so we can simply | |
848 | * clear the TS_RESTORE_SIGMASK flag. | |
849 | */ | |
850 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
851 | } | |
2d7d5f05 | 852 | return; |
1da177e4 | 853 | } |
28e61036 | 854 | if (restart_syscall && |
1da177e4 LT |
855 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || |
856 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
857 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
858 | /* replay the system call when we are done */ | |
28e61036 | 859 | regs->u_regs[UREG_I0] = orig_i0; |
1da177e4 LT |
860 | regs->tpc -= 4; |
861 | regs->tnpc -= 4; | |
c2785259 | 862 | pt_regs_clear_syscall(regs); |
1da177e4 | 863 | } |
28e61036 | 864 | if (restart_syscall && |
1da177e4 LT |
865 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { |
866 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
867 | regs->tpc -= 4; | |
868 | regs->tnpc -= 4; | |
c2785259 | 869 | pt_regs_clear_syscall(regs); |
1da177e4 | 870 | } |
2d7d5f05 | 871 | |
9a28dbf8 | 872 | /* If there's no signal to deliver, we just put the saved sigmask |
2d7d5f05 DM |
873 | * back |
874 | */ | |
9a28dbf8 DM |
875 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
876 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
27f20dca | 877 | set_current_blocked(¤t->saved_sigmask); |
2d7d5f05 | 878 | } |
1da177e4 LT |
879 | } |
880 | ||
881 | struct sigstack32 { | |
882 | u32 the_stack; | |
883 | int cur_status; | |
884 | }; | |
885 | ||
886 | asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) | |
887 | { | |
888 | struct sigstack32 __user *ssptr = | |
889 | (struct sigstack32 __user *)((unsigned long)(u_ssptr)); | |
890 | struct sigstack32 __user *ossptr = | |
891 | (struct sigstack32 __user *)((unsigned long)(u_ossptr)); | |
892 | int ret = -EFAULT; | |
893 | ||
894 | /* First see if old state is wanted. */ | |
895 | if (ossptr) { | |
896 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
897 | &ossptr->the_stack) || | |
898 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
899 | goto out; | |
900 | } | |
901 | ||
902 | /* Now see if we want to update the new state. */ | |
903 | if (ssptr) { | |
904 | u32 ss_sp; | |
905 | ||
906 | if (get_user(ss_sp, &ssptr->the_stack)) | |
907 | goto out; | |
908 | ||
909 | /* If the current stack was set with sigaltstack, don't | |
910 | * swap stacks while we are on it. | |
911 | */ | |
912 | ret = -EPERM; | |
913 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
914 | goto out; | |
915 | ||
916 | /* Since we don't know the extent of the stack, and we don't | |
917 | * track onstack-ness, but rather calculate it, we must | |
918 | * presume a size. Ho hum this interface is lossy. | |
919 | */ | |
920 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
921 | current->sas_ss_size = SIGSTKSZ; | |
922 | } | |
923 | ||
924 | ret = 0; | |
925 | out: | |
926 | return ret; | |
927 | } | |
928 | ||
929 | asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp) | |
930 | { | |
931 | stack_t uss, uoss; | |
932 | u32 u_ss_sp = 0; | |
933 | int ret; | |
934 | mm_segment_t old_fs; | |
935 | stack_t32 __user *uss32 = compat_ptr(ussa); | |
936 | stack_t32 __user *uoss32 = compat_ptr(uossa); | |
937 | ||
938 | if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) || | |
939 | __get_user(uss.ss_flags, &uss32->ss_flags) || | |
940 | __get_user(uss.ss_size, &uss32->ss_size))) | |
941 | return -EFAULT; | |
942 | uss.ss_sp = compat_ptr(u_ss_sp); | |
943 | old_fs = get_fs(); | |
944 | set_fs(KERNEL_DS); | |
945 | ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL, | |
946 | uossa ? (stack_t __user *) &uoss : NULL, sp); | |
947 | set_fs(old_fs); | |
948 | if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) || | |
949 | __put_user(uoss.ss_flags, &uoss32->ss_flags) || | |
950 | __put_user(uoss.ss_size, &uoss32->ss_size))) | |
951 | return -EFAULT; | |
952 | return ret; | |
953 | } |