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1/* arch/sparc64/kernel/signal32.c
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>
19#include <linux/binfmts.h>
20#include <linux/compat.h>
21#include <linux/bitops.h>
22#include <linux/tracehook.h>
23
24#include <asm/uaccess.h>
25#include <asm/ptrace.h>
26#include <asm/pgtable.h>
27#include <asm/psrcompat.h>
28#include <asm/fpumacro.h>
29#include <asm/visasm.h>
30#include <asm/compat_signal.h>
31
32#include "sigutil.h"
33
34#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
35
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
40typedef struct {
41 unsigned int g_upper[8];
42 unsigned int o_upper[8];
43 unsigned int asi;
44} siginfo_extra_v8plus_t;
45
46struct signal_frame32 {
47 struct sparc_stackf32 ss;
48 __siginfo32_t info;
49 /* __siginfo_fpu_t * */ u32 fpu_save;
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;
55 /* __siginfo_rwin_t * */u32 rwin_save;
56} __attribute__((aligned(8)));
57
58typedef 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 {
74 compat_timer_t _tid; /* timer id */
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
110struct rt_signal_frame32 {
111 struct sparc_stackf32 ss;
112 compat_siginfo_t info;
113 struct pt_regs32 regs;
114 compat_sigset_t mask;
115 /* __siginfo_fpu_t * */ u32 fpu_save;
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;
121 /* __siginfo_rwin_t * */u32 rwin_save;
122} __attribute__((aligned(8)));
123
124int 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:
159 err |= __put_user(from->si_trapno, &to->si_trapno);
160 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
161 break;
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;
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 */
180int 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
193void do_sigreturn32(struct pt_regs *regs)
194{
195 struct signal_frame32 __user *sf;
196 compat_uptr_t fpu_save;
197 compat_uptr_t rwin_save;
198 unsigned int psr;
199 unsigned pc, npc;
200 sigset_t set;
201 unsigned seta[_COMPAT_NSIG_WORDS];
202 int err, i;
203
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
209 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
210 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
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
253 /* Prevent syscall restart. */
254 pt_regs_clear_syscall(regs);
255
256 err |= __get_user(fpu_save, &sf->fpu_save);
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 }
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);
276 set_current_blocked(&set);
277 return;
278
279segv:
280 force_sig(SIGSEGV, current);
281}
282
283asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
284{
285 struct rt_signal_frame32 __user *sf;
286 unsigned int psr, pc, npc, u_ss_sp;
287 compat_uptr_t fpu_save;
288 compat_uptr_t rwin_save;
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
343 /* Prevent syscall restart. */
344 pt_regs_clear_syscall(regs);
345
346 err |= __get_user(fpu_save, &sf->fpu_save);
347 if (!err && fpu_save)
348 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
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
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
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);
377 set_current_blocked(&set);
378 return;
379segv:
380 force_sig(SIGSEGV, current);
381}
382
383/* Checks if the fp is valid */
384static 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
391static 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
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
405 /* This is the X/Open sanctioned signal stack switching. */
406 if (sa->sa_flags & SA_ONSTACK) {
407 if (sas_ss_flags(sp) == 0)
408 sp = current->sas_ss_sp + current->sas_ss_size;
409 }
410
411 sp -= framesize;
412
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 */
419 sp &= ~15UL;
420
421 return (void __user *) sp;
422}
423
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 */
431static 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
475out_unmap:
476 pte_unmap(ptep);
477out_irqs_on:
478 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
479
480}
481
482static int setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
483 int signo, sigset_t *oldset)
484{
485 struct signal_frame32 __user *sf;
486 int i, err, wsaved;
487 void __user *tail;
488 int sigframe_size;
489 u32 psr;
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
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);
503
504 sf = (struct signal_frame32 __user *)
505 get_sigframe(&ka->sa, regs, sigframe_size);
506
507 if (invalid_frame_pointer(sf, sigframe_size))
508 goto sigill;
509
510 tail = (sf + 1);
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) {
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);
539 } else {
540 err |= __put_user(0, &sf->fpu_save);
541 }
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 }
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
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 }
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 {
602 unsigned long address = ((unsigned long)&(sf->insns[0]));
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;
610 flush_signal_insns(address);
611 }
612 return 0;
613
614sigill:
615 do_exit(SIGILL);
616 return -EINVAL;
617
618sigsegv:
619 force_sigsegv(signo, current);
620 return -EFAULT;
621}
622
623static int setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
624 unsigned long signr, sigset_t *oldset,
625 siginfo_t *info)
626{
627 struct rt_signal_frame32 __user *sf;
628 int i, err, wsaved;
629 void __user *tail;
630 int sigframe_size;
631 u32 psr;
632 compat_sigset_t seta;
633
634 /* 1. Make sure everything is clean */
635 synchronize_user_stack();
636 save_and_clear_fpu();
637
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);
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
652 tail = (sf + 1);
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) {
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);
681 } else {
682 err |= __put_user(0, &sf->fpu_save);
683 }
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 }
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
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 }
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 {
750 unsigned long address = ((unsigned long)&(sf->insns[0]));
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
762 flush_signal_insns(address);
763 }
764 return 0;
765
766sigill:
767 do_exit(SIGILL);
768 return -EINVAL;
769
770sigsegv:
771 force_sigsegv(signr, current);
772 return -EFAULT;
773}
774
775static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka,
776 siginfo_t *info,
777 sigset_t *oldset, struct pt_regs *regs)
778{
779 sigset_t blocked;
780 int err;
781
782 if (ka->sa.sa_flags & SA_SIGINFO)
783 err = setup_rt_frame32(ka, regs, signr, oldset, info);
784 else
785 err = setup_frame32(ka, regs, signr, oldset);
786
787 if (err)
788 return err;
789
790 sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask);
791 if (!(ka->sa.sa_flags & SA_NOMASK))
792 sigaddset(&blocked, signr);
793 set_current_blocked(&blocked);
794
795 tracehook_signal_handler(signr, info, ka, regs, 0);
796
797 return 0;
798}
799
800static 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 */
825void do_signal32(sigset_t *oldset, struct pt_regs * regs,
826 int restart_syscall, unsigned long orig_i0)
827{
828 struct k_sigaction ka;
829 siginfo_t info;
830 int signr;
831
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
841 if (signr > 0) {
842 if (restart_syscall)
843 syscall_restart32(orig_i0, regs, &ka.sa);
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 }
852 return;
853 }
854 if (restart_syscall &&
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 */
859 regs->u_regs[UREG_I0] = orig_i0;
860 regs->tpc -= 4;
861 regs->tnpc -= 4;
862 pt_regs_clear_syscall(regs);
863 }
864 if (restart_syscall &&
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;
869 pt_regs_clear_syscall(regs);
870 }
871
872 /* If there's no signal to deliver, we just put the saved sigmask
873 * back
874 */
875 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
876 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
877 set_current_blocked(¤t->saved_sigmask);
878 }
879}
880
881struct sigstack32 {
882 u32 the_stack;
883 int cur_status;
884};
885
886asmlinkage 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;
925out:
926 return ret;
927}
928
929asmlinkage 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}
1/* arch/sparc64/kernel/signal32.c
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>
19#include <linux/binfmts.h>
20#include <linux/compat.h>
21#include <linux/bitops.h>
22#include <linux/tracehook.h>
23
24#include <asm/uaccess.h>
25#include <asm/ptrace.h>
26#include <asm/pgtable.h>
27#include <asm/psrcompat.h>
28#include <asm/fpumacro.h>
29#include <asm/visasm.h>
30#include <asm/compat_signal.h>
31#include <asm/switch_to.h>
32
33#include "sigutil.h"
34#include "kernel.h"
35
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
40typedef struct {
41 unsigned int g_upper[8];
42 unsigned int o_upper[8];
43 unsigned int asi;
44} siginfo_extra_v8plus_t;
45
46struct signal_frame32 {
47 struct sparc_stackf32 ss;
48 __siginfo32_t info;
49 /* __siginfo_fpu_t * */ u32 fpu_save;
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;
55 /* __siginfo_rwin_t * */u32 rwin_save;
56} __attribute__((aligned(8)));
57
58struct rt_signal_frame32 {
59 struct sparc_stackf32 ss;
60 compat_siginfo_t info;
61 struct pt_regs32 regs;
62 compat_sigset_t mask;
63 /* __siginfo_fpu_t * */ u32 fpu_save;
64 unsigned int insns[2];
65 compat_stack_t stack;
66 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
67 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
68 siginfo_extra_v8plus_t v8plus;
69 /* __siginfo_rwin_t * */u32 rwin_save;
70} __attribute__((aligned(8)));
71
72int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
73{
74 int err;
75
76 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
77 return -EFAULT;
78
79 /* If you change siginfo_t structure, please be sure
80 this code is fixed accordingly.
81 It should never copy any pad contained in the structure
82 to avoid security leaks, but must copy the generic
83 3 ints plus the relevant union member.
84 This routine must convert siginfo from 64bit to 32bit as well
85 at the same time. */
86 err = __put_user(from->si_signo, &to->si_signo);
87 err |= __put_user(from->si_errno, &to->si_errno);
88 err |= __put_user((short)from->si_code, &to->si_code);
89 if (from->si_code < 0)
90 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
91 else {
92 switch (from->si_code >> 16) {
93 case __SI_TIMER >> 16:
94 err |= __put_user(from->si_tid, &to->si_tid);
95 err |= __put_user(from->si_overrun, &to->si_overrun);
96 err |= __put_user(from->si_int, &to->si_int);
97 break;
98 case __SI_CHLD >> 16:
99 err |= __put_user(from->si_utime, &to->si_utime);
100 err |= __put_user(from->si_stime, &to->si_stime);
101 err |= __put_user(from->si_status, &to->si_status);
102 default:
103 err |= __put_user(from->si_pid, &to->si_pid);
104 err |= __put_user(from->si_uid, &to->si_uid);
105 break;
106 case __SI_FAULT >> 16:
107 err |= __put_user(from->si_trapno, &to->si_trapno);
108 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
109 break;
110 case __SI_POLL >> 16:
111 err |= __put_user(from->si_band, &to->si_band);
112 err |= __put_user(from->si_fd, &to->si_fd);
113 break;
114 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
115 case __SI_MESGQ >> 16:
116 err |= __put_user(from->si_pid, &to->si_pid);
117 err |= __put_user(from->si_uid, &to->si_uid);
118 err |= __put_user(from->si_int, &to->si_int);
119 break;
120 }
121 }
122 return err;
123}
124
125/* CAUTION: This is just a very minimalist implementation for the
126 * sake of compat_sys_rt_sigqueueinfo()
127 */
128int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
129{
130 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
131 return -EFAULT;
132
133 if (copy_from_user(to, from, 3*sizeof(int)) ||
134 copy_from_user(to->_sifields._pad, from->_sifields._pad,
135 SI_PAD_SIZE))
136 return -EFAULT;
137
138 return 0;
139}
140
141void do_sigreturn32(struct pt_regs *regs)
142{
143 struct signal_frame32 __user *sf;
144 compat_uptr_t fpu_save;
145 compat_uptr_t rwin_save;
146 unsigned int psr;
147 unsigned int pc, npc;
148 sigset_t set;
149 compat_sigset_t seta;
150 int err, i;
151
152 /* Always make any pending restarted system calls return -EINTR */
153 current->restart_block.fn = do_no_restart_syscall;
154
155 synchronize_user_stack();
156
157 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
158 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
159
160 /* 1. Make sure we are not getting garbage from the user */
161 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
162 (((unsigned long) sf) & 3))
163 goto segv;
164
165 if (get_user(pc, &sf->info.si_regs.pc) ||
166 __get_user(npc, &sf->info.si_regs.npc))
167 goto segv;
168
169 if ((pc | npc) & 3)
170 goto segv;
171
172 if (test_thread_flag(TIF_32BIT)) {
173 pc &= 0xffffffff;
174 npc &= 0xffffffff;
175 }
176 regs->tpc = pc;
177 regs->tnpc = npc;
178
179 /* 2. Restore the state */
180 err = __get_user(regs->y, &sf->info.si_regs.y);
181 err |= __get_user(psr, &sf->info.si_regs.psr);
182
183 for (i = UREG_G1; i <= UREG_I7; i++)
184 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
185 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
186 err |= __get_user(i, &sf->v8plus.g_upper[0]);
187 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
188 unsigned long asi;
189
190 for (i = UREG_G1; i <= UREG_I7; i++)
191 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
192 err |= __get_user(asi, &sf->v8plus.asi);
193 regs->tstate &= ~TSTATE_ASI;
194 regs->tstate |= ((asi & 0xffUL) << 24UL);
195 }
196 }
197
198 /* User can only change condition codes in %tstate. */
199 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
200 regs->tstate |= psr_to_tstate_icc(psr);
201
202 /* Prevent syscall restart. */
203 pt_regs_clear_syscall(regs);
204
205 err |= __get_user(fpu_save, &sf->fpu_save);
206 if (!err && fpu_save)
207 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
208 err |= __get_user(rwin_save, &sf->rwin_save);
209 if (!err && rwin_save) {
210 if (restore_rwin_state(compat_ptr(rwin_save)))
211 goto segv;
212 }
213 err |= __get_user(seta.sig[0], &sf->info.si_mask);
214 err |= copy_from_user(&seta.sig[1], &sf->extramask,
215 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
216 if (err)
217 goto segv;
218
219 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
220 set_current_blocked(&set);
221 return;
222
223segv:
224 force_sig(SIGSEGV, current);
225}
226
227asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
228{
229 struct rt_signal_frame32 __user *sf;
230 unsigned int psr, pc, npc;
231 compat_uptr_t fpu_save;
232 compat_uptr_t rwin_save;
233 sigset_t set;
234 compat_sigset_t seta;
235 int err, i;
236
237 /* Always make any pending restarted system calls return -EINTR */
238 current->restart_block.fn = do_no_restart_syscall;
239
240 synchronize_user_stack();
241 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
242 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
243
244 /* 1. Make sure we are not getting garbage from the user */
245 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
246 (((unsigned long) sf) & 3))
247 goto segv;
248
249 if (get_user(pc, &sf->regs.pc) ||
250 __get_user(npc, &sf->regs.npc))
251 goto segv;
252
253 if ((pc | npc) & 3)
254 goto segv;
255
256 if (test_thread_flag(TIF_32BIT)) {
257 pc &= 0xffffffff;
258 npc &= 0xffffffff;
259 }
260 regs->tpc = pc;
261 regs->tnpc = npc;
262
263 /* 2. Restore the state */
264 err = __get_user(regs->y, &sf->regs.y);
265 err |= __get_user(psr, &sf->regs.psr);
266
267 for (i = UREG_G1; i <= UREG_I7; i++)
268 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
269 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
270 err |= __get_user(i, &sf->v8plus.g_upper[0]);
271 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
272 unsigned long asi;
273
274 for (i = UREG_G1; i <= UREG_I7; i++)
275 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
276 err |= __get_user(asi, &sf->v8plus.asi);
277 regs->tstate &= ~TSTATE_ASI;
278 regs->tstate |= ((asi & 0xffUL) << 24UL);
279 }
280 }
281
282 /* User can only change condition codes in %tstate. */
283 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
284 regs->tstate |= psr_to_tstate_icc(psr);
285
286 /* Prevent syscall restart. */
287 pt_regs_clear_syscall(regs);
288
289 err |= __get_user(fpu_save, &sf->fpu_save);
290 if (!err && fpu_save)
291 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
292 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
293 err |= compat_restore_altstack(&sf->stack);
294 if (err)
295 goto segv;
296
297 err |= __get_user(rwin_save, &sf->rwin_save);
298 if (!err && rwin_save) {
299 if (restore_rwin_state(compat_ptr(rwin_save)))
300 goto segv;
301 }
302
303 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
304 set_current_blocked(&set);
305 return;
306segv:
307 force_sig(SIGSEGV, current);
308}
309
310/* Checks if the fp is valid */
311static int invalid_frame_pointer(void __user *fp, int fplen)
312{
313 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
314 return 1;
315 return 0;
316}
317
318static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
319{
320 unsigned long sp;
321
322 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
323 sp = regs->u_regs[UREG_FP];
324
325 /*
326 * If we are on the alternate signal stack and would overflow it, don't.
327 * Return an always-bogus address instead so we will die with SIGSEGV.
328 */
329 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
330 return (void __user *) -1L;
331
332 /* This is the X/Open sanctioned signal stack switching. */
333 sp = sigsp(sp, ksig) - framesize;
334
335 /* Always align the stack frame. This handles two cases. First,
336 * sigaltstack need not be mindful of platform specific stack
337 * alignment. Second, if we took this signal because the stack
338 * is not aligned properly, we'd like to take the signal cleanly
339 * and report that.
340 */
341 sp &= ~15UL;
342
343 return (void __user *) sp;
344}
345
346/* The I-cache flush instruction only works in the primary ASI, which
347 * right now is the nucleus, aka. kernel space.
348 *
349 * Therefore we have to kick the instructions out using the kernel
350 * side linear mapping of the physical address backing the user
351 * instructions.
352 */
353static void flush_signal_insns(unsigned long address)
354{
355 unsigned long pstate, paddr;
356 pte_t *ptep, pte;
357 pgd_t *pgdp;
358 pud_t *pudp;
359 pmd_t *pmdp;
360
361 /* Commit all stores of the instructions we are about to flush. */
362 wmb();
363
364 /* Disable cross-call reception. In this way even a very wide
365 * munmap() on another cpu can't tear down the page table
366 * hierarchy from underneath us, since that can't complete
367 * until the IPI tlb flush returns.
368 */
369
370 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
371 __asm__ __volatile__("wrpr %0, %1, %%pstate"
372 : : "r" (pstate), "i" (PSTATE_IE));
373
374 pgdp = pgd_offset(current->mm, address);
375 if (pgd_none(*pgdp))
376 goto out_irqs_on;
377 pudp = pud_offset(pgdp, address);
378 if (pud_none(*pudp))
379 goto out_irqs_on;
380 pmdp = pmd_offset(pudp, address);
381 if (pmd_none(*pmdp))
382 goto out_irqs_on;
383
384 ptep = pte_offset_map(pmdp, address);
385 pte = *ptep;
386 if (!pte_present(pte))
387 goto out_unmap;
388
389 paddr = (unsigned long) page_address(pte_page(pte));
390
391 __asm__ __volatile__("flush %0 + %1"
392 : /* no outputs */
393 : "r" (paddr),
394 "r" (address & (PAGE_SIZE - 1))
395 : "memory");
396
397out_unmap:
398 pte_unmap(ptep);
399out_irqs_on:
400 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
401
402}
403
404static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
405 sigset_t *oldset)
406{
407 struct signal_frame32 __user *sf;
408 int i, err, wsaved;
409 void __user *tail;
410 int sigframe_size;
411 u32 psr;
412 compat_sigset_t seta;
413
414 /* 1. Make sure everything is clean */
415 synchronize_user_stack();
416 save_and_clear_fpu();
417
418 wsaved = get_thread_wsaved();
419
420 sigframe_size = sizeof(*sf);
421 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
422 sigframe_size += sizeof(__siginfo_fpu_t);
423 if (wsaved)
424 sigframe_size += sizeof(__siginfo_rwin_t);
425
426 sf = (struct signal_frame32 __user *)
427 get_sigframe(ksig, regs, sigframe_size);
428
429 if (invalid_frame_pointer(sf, sigframe_size)) {
430 do_exit(SIGILL);
431 return -EINVAL;
432 }
433
434 tail = (sf + 1);
435
436 /* 2. Save the current process state */
437 if (test_thread_flag(TIF_32BIT)) {
438 regs->tpc &= 0xffffffff;
439 regs->tnpc &= 0xffffffff;
440 }
441 err = put_user(regs->tpc, &sf->info.si_regs.pc);
442 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
443 err |= __put_user(regs->y, &sf->info.si_regs.y);
444 psr = tstate_to_psr(regs->tstate);
445 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
446 psr |= PSR_EF;
447 err |= __put_user(psr, &sf->info.si_regs.psr);
448 for (i = 0; i < 16; i++)
449 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
450 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
451 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
452 for (i = 1; i < 16; i++)
453 err |= __put_user(((u32 *)regs->u_regs)[2*i],
454 &sf->v8plus.g_upper[i]);
455 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
456 &sf->v8plus.asi);
457
458 if (psr & PSR_EF) {
459 __siginfo_fpu_t __user *fp = tail;
460 tail += sizeof(*fp);
461 err |= save_fpu_state(regs, fp);
462 err |= __put_user((u64)fp, &sf->fpu_save);
463 } else {
464 err |= __put_user(0, &sf->fpu_save);
465 }
466 if (wsaved) {
467 __siginfo_rwin_t __user *rwp = tail;
468 tail += sizeof(*rwp);
469 err |= save_rwin_state(wsaved, rwp);
470 err |= __put_user((u64)rwp, &sf->rwin_save);
471 set_thread_wsaved(0);
472 } else {
473 err |= __put_user(0, &sf->rwin_save);
474 }
475
476 /* If these change we need to know - assignments to seta relies on these sizes */
477 BUILD_BUG_ON(_NSIG_WORDS != 1);
478 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
479 seta.sig[1] = (oldset->sig[0] >> 32);
480 seta.sig[0] = oldset->sig[0];
481
482 err |= __put_user(seta.sig[0], &sf->info.si_mask);
483 err |= __copy_to_user(sf->extramask, &seta.sig[1],
484 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
485
486 if (!wsaved) {
487 err |= copy_in_user((u32 __user *)sf,
488 (u32 __user *)(regs->u_regs[UREG_FP]),
489 sizeof(struct reg_window32));
490 } else {
491 struct reg_window *rp;
492
493 rp = ¤t_thread_info()->reg_window[wsaved - 1];
494 for (i = 0; i < 8; i++)
495 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
496 for (i = 0; i < 6; i++)
497 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
498 err |= __put_user(rp->ins[6], &sf->ss.fp);
499 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
500 }
501 if (err)
502 return err;
503
504 /* 3. signal handler back-trampoline and parameters */
505 regs->u_regs[UREG_FP] = (unsigned long) sf;
506 regs->u_regs[UREG_I0] = ksig->sig;
507 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
508 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
509
510 /* 4. signal handler */
511 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
512 regs->tnpc = (regs->tpc + 4);
513 if (test_thread_flag(TIF_32BIT)) {
514 regs->tpc &= 0xffffffff;
515 regs->tnpc &= 0xffffffff;
516 }
517
518 /* 5. return to kernel instructions */
519 if (ksig->ka.ka_restorer) {
520 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
521 } else {
522 unsigned long address = ((unsigned long)&(sf->insns[0]));
523
524 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
525
526 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
527 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
528 if (err)
529 return err;
530 flush_signal_insns(address);
531 }
532 return 0;
533}
534
535static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
536 sigset_t *oldset)
537{
538 struct rt_signal_frame32 __user *sf;
539 int i, err, wsaved;
540 void __user *tail;
541 int sigframe_size;
542 u32 psr;
543 compat_sigset_t seta;
544
545 /* 1. Make sure everything is clean */
546 synchronize_user_stack();
547 save_and_clear_fpu();
548
549 wsaved = get_thread_wsaved();
550
551 sigframe_size = sizeof(*sf);
552 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
553 sigframe_size += sizeof(__siginfo_fpu_t);
554 if (wsaved)
555 sigframe_size += sizeof(__siginfo_rwin_t);
556
557 sf = (struct rt_signal_frame32 __user *)
558 get_sigframe(ksig, regs, sigframe_size);
559
560 if (invalid_frame_pointer(sf, sigframe_size)) {
561 do_exit(SIGILL);
562 return -EINVAL;
563 }
564
565 tail = (sf + 1);
566
567 /* 2. Save the current process state */
568 if (test_thread_flag(TIF_32BIT)) {
569 regs->tpc &= 0xffffffff;
570 regs->tnpc &= 0xffffffff;
571 }
572 err = put_user(regs->tpc, &sf->regs.pc);
573 err |= __put_user(regs->tnpc, &sf->regs.npc);
574 err |= __put_user(regs->y, &sf->regs.y);
575 psr = tstate_to_psr(regs->tstate);
576 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
577 psr |= PSR_EF;
578 err |= __put_user(psr, &sf->regs.psr);
579 for (i = 0; i < 16; i++)
580 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
581 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
582 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
583 for (i = 1; i < 16; i++)
584 err |= __put_user(((u32 *)regs->u_regs)[2*i],
585 &sf->v8plus.g_upper[i]);
586 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
587 &sf->v8plus.asi);
588
589 if (psr & PSR_EF) {
590 __siginfo_fpu_t __user *fp = tail;
591 tail += sizeof(*fp);
592 err |= save_fpu_state(regs, fp);
593 err |= __put_user((u64)fp, &sf->fpu_save);
594 } else {
595 err |= __put_user(0, &sf->fpu_save);
596 }
597 if (wsaved) {
598 __siginfo_rwin_t __user *rwp = tail;
599 tail += sizeof(*rwp);
600 err |= save_rwin_state(wsaved, rwp);
601 err |= __put_user((u64)rwp, &sf->rwin_save);
602 set_thread_wsaved(0);
603 } else {
604 err |= __put_user(0, &sf->rwin_save);
605 }
606
607 /* Update the siginfo structure. */
608 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
609
610 /* Setup sigaltstack */
611 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
612
613 seta.sig[1] = (oldset->sig[0] >> 32);
614 seta.sig[0] = oldset->sig[0];
615 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
616
617 if (!wsaved) {
618 err |= copy_in_user((u32 __user *)sf,
619 (u32 __user *)(regs->u_regs[UREG_FP]),
620 sizeof(struct reg_window32));
621 } else {
622 struct reg_window *rp;
623
624 rp = ¤t_thread_info()->reg_window[wsaved - 1];
625 for (i = 0; i < 8; i++)
626 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
627 for (i = 0; i < 6; i++)
628 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
629 err |= __put_user(rp->ins[6], &sf->ss.fp);
630 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
631 }
632 if (err)
633 return err;
634
635 /* 3. signal handler back-trampoline and parameters */
636 regs->u_regs[UREG_FP] = (unsigned long) sf;
637 regs->u_regs[UREG_I0] = ksig->sig;
638 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
639 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
640
641 /* 4. signal handler */
642 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
643 regs->tnpc = (regs->tpc + 4);
644 if (test_thread_flag(TIF_32BIT)) {
645 regs->tpc &= 0xffffffff;
646 regs->tnpc &= 0xffffffff;
647 }
648
649 /* 5. return to kernel instructions */
650 if (ksig->ka.ka_restorer)
651 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
652 else {
653 unsigned long address = ((unsigned long)&(sf->insns[0]));
654
655 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
656
657 /* mov __NR_rt_sigreturn, %g1 */
658 err |= __put_user(0x82102065, &sf->insns[0]);
659
660 /* t 0x10 */
661 err |= __put_user(0x91d02010, &sf->insns[1]);
662 if (err)
663 return err;
664
665 flush_signal_insns(address);
666 }
667 return 0;
668}
669
670static inline void handle_signal32(struct ksignal *ksig,
671 struct pt_regs *regs)
672{
673 sigset_t *oldset = sigmask_to_save();
674 int err;
675
676 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
677 err = setup_rt_frame32(ksig, regs, oldset);
678 else
679 err = setup_frame32(ksig, regs, oldset);
680
681 signal_setup_done(err, ksig, 0);
682}
683
684static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
685 struct sigaction *sa)
686{
687 switch (regs->u_regs[UREG_I0]) {
688 case ERESTART_RESTARTBLOCK:
689 case ERESTARTNOHAND:
690 no_system_call_restart:
691 regs->u_regs[UREG_I0] = EINTR;
692 regs->tstate |= TSTATE_ICARRY;
693 break;
694 case ERESTARTSYS:
695 if (!(sa->sa_flags & SA_RESTART))
696 goto no_system_call_restart;
697 /* fallthrough */
698 case ERESTARTNOINTR:
699 regs->u_regs[UREG_I0] = orig_i0;
700 regs->tpc -= 4;
701 regs->tnpc -= 4;
702 }
703}
704
705/* Note that 'init' is a special process: it doesn't get signals it doesn't
706 * want to handle. Thus you cannot kill init even with a SIGKILL even by
707 * mistake.
708 */
709void do_signal32(struct pt_regs * regs)
710{
711 struct ksignal ksig;
712 unsigned long orig_i0 = 0;
713 int restart_syscall = 0;
714 bool has_handler = get_signal(&ksig);
715
716 if (pt_regs_is_syscall(regs) &&
717 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
718 restart_syscall = 1;
719 orig_i0 = regs->u_regs[UREG_G6];
720 }
721
722 if (has_handler) {
723 if (restart_syscall)
724 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
725 handle_signal32(&ksig, regs);
726 } else {
727 if (restart_syscall) {
728 switch (regs->u_regs[UREG_I0]) {
729 case ERESTARTNOHAND:
730 case ERESTARTSYS:
731 case ERESTARTNOINTR:
732 /* replay the system call when we are done */
733 regs->u_regs[UREG_I0] = orig_i0;
734 regs->tpc -= 4;
735 regs->tnpc -= 4;
736 pt_regs_clear_syscall(regs);
737 case ERESTART_RESTARTBLOCK:
738 regs->u_regs[UREG_G1] = __NR_restart_syscall;
739 regs->tpc -= 4;
740 regs->tnpc -= 4;
741 pt_regs_clear_syscall(regs);
742 }
743 }
744 restore_saved_sigmask();
745 }
746}
747
748struct sigstack32 {
749 u32 the_stack;
750 int cur_status;
751};
752
753asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
754{
755 struct sigstack32 __user *ssptr =
756 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
757 struct sigstack32 __user *ossptr =
758 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
759 int ret = -EFAULT;
760
761 /* First see if old state is wanted. */
762 if (ossptr) {
763 if (put_user(current->sas_ss_sp + current->sas_ss_size,
764 &ossptr->the_stack) ||
765 __put_user(on_sig_stack(sp), &ossptr->cur_status))
766 goto out;
767 }
768
769 /* Now see if we want to update the new state. */
770 if (ssptr) {
771 u32 ss_sp;
772
773 if (get_user(ss_sp, &ssptr->the_stack))
774 goto out;
775
776 /* If the current stack was set with sigaltstack, don't
777 * swap stacks while we are on it.
778 */
779 ret = -EPERM;
780 if (current->sas_ss_sp && on_sig_stack(sp))
781 goto out;
782
783 /* Since we don't know the extent of the stack, and we don't
784 * track onstack-ness, but rather calculate it, we must
785 * presume a size. Ho hum this interface is lossy.
786 */
787 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
788 current->sas_ss_size = SIGSTKSZ;
789 }
790
791 ret = 0;
792out:
793 return ret;
794}