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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#include <asm/switch_to.h>
32
33#include "sigutil.h"
34
35/* This magic should be in g_upper[0] for all upper parts
36 * to be valid.
37 */
38#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
39typedef struct {
40 unsigned int g_upper[8];
41 unsigned int o_upper[8];
42 unsigned int asi;
43} siginfo_extra_v8plus_t;
44
45struct signal_frame32 {
46 struct sparc_stackf32 ss;
47 __siginfo32_t info;
48 /* __siginfo_fpu_t * */ u32 fpu_save;
49 unsigned int insns[2];
50 unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
51 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
52 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
53 siginfo_extra_v8plus_t v8plus;
54 /* __siginfo_rwin_t * */u32 rwin_save;
55} __attribute__((aligned(8)));
56
57typedef struct compat_siginfo{
58 int si_signo;
59 int si_errno;
60 int si_code;
61
62 union {
63 int _pad[SI_PAD_SIZE32];
64
65 /* kill() */
66 struct {
67 compat_pid_t _pid; /* sender's pid */
68 unsigned int _uid; /* sender's uid */
69 } _kill;
70
71 /* POSIX.1b timers */
72 struct {
73 compat_timer_t _tid; /* timer id */
74 int _overrun; /* overrun count */
75 compat_sigval_t _sigval; /* same as below */
76 int _sys_private; /* not to be passed to user */
77 } _timer;
78
79 /* POSIX.1b signals */
80 struct {
81 compat_pid_t _pid; /* sender's pid */
82 unsigned int _uid; /* sender's uid */
83 compat_sigval_t _sigval;
84 } _rt;
85
86 /* SIGCHLD */
87 struct {
88 compat_pid_t _pid; /* which child */
89 unsigned int _uid; /* sender's uid */
90 int _status; /* exit code */
91 compat_clock_t _utime;
92 compat_clock_t _stime;
93 } _sigchld;
94
95 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */
96 struct {
97 u32 _addr; /* faulting insn/memory ref. */
98 int _trapno;
99 } _sigfault;
100
101 /* SIGPOLL */
102 struct {
103 int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
104 int _fd;
105 } _sigpoll;
106 } _sifields;
107}compat_siginfo_t;
108
109struct rt_signal_frame32 {
110 struct sparc_stackf32 ss;
111 compat_siginfo_t info;
112 struct pt_regs32 regs;
113 compat_sigset_t mask;
114 /* __siginfo_fpu_t * */ u32 fpu_save;
115 unsigned int insns[2];
116 stack_t32 stack;
117 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
118 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
119 siginfo_extra_v8plus_t v8plus;
120 /* __siginfo_rwin_t * */u32 rwin_save;
121} __attribute__((aligned(8)));
122
123int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
124{
125 int err;
126
127 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
128 return -EFAULT;
129
130 /* If you change siginfo_t structure, please be sure
131 this code is fixed accordingly.
132 It should never copy any pad contained in the structure
133 to avoid security leaks, but must copy the generic
134 3 ints plus the relevant union member.
135 This routine must convert siginfo from 64bit to 32bit as well
136 at the same time. */
137 err = __put_user(from->si_signo, &to->si_signo);
138 err |= __put_user(from->si_errno, &to->si_errno);
139 err |= __put_user((short)from->si_code, &to->si_code);
140 if (from->si_code < 0)
141 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
142 else {
143 switch (from->si_code >> 16) {
144 case __SI_TIMER >> 16:
145 err |= __put_user(from->si_tid, &to->si_tid);
146 err |= __put_user(from->si_overrun, &to->si_overrun);
147 err |= __put_user(from->si_int, &to->si_int);
148 break;
149 case __SI_CHLD >> 16:
150 err |= __put_user(from->si_utime, &to->si_utime);
151 err |= __put_user(from->si_stime, &to->si_stime);
152 err |= __put_user(from->si_status, &to->si_status);
153 default:
154 err |= __put_user(from->si_pid, &to->si_pid);
155 err |= __put_user(from->si_uid, &to->si_uid);
156 break;
157 case __SI_FAULT >> 16:
158 err |= __put_user(from->si_trapno, &to->si_trapno);
159 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
160 break;
161 case __SI_POLL >> 16:
162 err |= __put_user(from->si_band, &to->si_band);
163 err |= __put_user(from->si_fd, &to->si_fd);
164 break;
165 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
166 case __SI_MESGQ >> 16:
167 err |= __put_user(from->si_pid, &to->si_pid);
168 err |= __put_user(from->si_uid, &to->si_uid);
169 err |= __put_user(from->si_int, &to->si_int);
170 break;
171 }
172 }
173 return err;
174}
175
176/* CAUTION: This is just a very minimalist implementation for the
177 * sake of compat_sys_rt_sigqueueinfo()
178 */
179int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
180{
181 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
182 return -EFAULT;
183
184 if (copy_from_user(to, from, 3*sizeof(int)) ||
185 copy_from_user(to->_sifields._pad, from->_sifields._pad,
186 SI_PAD_SIZE))
187 return -EFAULT;
188
189 return 0;
190}
191
192void do_sigreturn32(struct pt_regs *regs)
193{
194 struct signal_frame32 __user *sf;
195 compat_uptr_t fpu_save;
196 compat_uptr_t rwin_save;
197 unsigned int psr;
198 unsigned pc, npc;
199 sigset_t set;
200 unsigned seta[_COMPAT_NSIG_WORDS];
201 int err, i;
202
203 /* Always make any pending restarted system calls return -EINTR */
204 current_thread_info()->restart_block.fn = do_no_restart_syscall;
205
206 synchronize_user_stack();
207
208 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
209 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
210
211 /* 1. Make sure we are not getting garbage from the user */
212 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
213 (((unsigned long) sf) & 3))
214 goto segv;
215
216 if (get_user(pc, &sf->info.si_regs.pc) ||
217 __get_user(npc, &sf->info.si_regs.npc))
218 goto segv;
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 set_current_blocked(&set);
276 return;
277
278segv:
279 force_sig(SIGSEGV, current);
280}
281
282asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
283{
284 struct rt_signal_frame32 __user *sf;
285 unsigned int psr, pc, npc, u_ss_sp;
286 compat_uptr_t fpu_save;
287 compat_uptr_t rwin_save;
288 mm_segment_t old_fs;
289 sigset_t set;
290 compat_sigset_t seta;
291 stack_t st;
292 int err, i;
293
294 /* Always make any pending restarted system calls return -EINTR */
295 current_thread_info()->restart_block.fn = do_no_restart_syscall;
296
297 synchronize_user_stack();
298 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
299 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
300
301 /* 1. Make sure we are not getting garbage from the user */
302 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
303 (((unsigned long) sf) & 3))
304 goto segv;
305
306 if (get_user(pc, &sf->regs.pc) ||
307 __get_user(npc, &sf->regs.npc))
308 goto segv;
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 set_current_blocked(&set);
377 return;
378segv:
379 force_sig(SIGSEGV, current);
380}
381
382/* Checks if the fp is valid */
383static int invalid_frame_pointer(void __user *fp, int fplen)
384{
385 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
386 return 1;
387 return 0;
388}
389
390static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
391{
392 unsigned long sp;
393
394 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
395 sp = regs->u_regs[UREG_FP];
396
397 /*
398 * If we are on the alternate signal stack and would overflow it, don't.
399 * Return an always-bogus address instead so we will die with SIGSEGV.
400 */
401 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
402 return (void __user *) -1L;
403
404 /* This is the X/Open sanctioned signal stack switching. */
405 if (sa->sa_flags & SA_ONSTACK) {
406 if (sas_ss_flags(sp) == 0)
407 sp = current->sas_ss_sp + current->sas_ss_size;
408 }
409
410 sp -= framesize;
411
412 /* Always align the stack frame. This handles two cases. First,
413 * sigaltstack need not be mindful of platform specific stack
414 * alignment. Second, if we took this signal because the stack
415 * is not aligned properly, we'd like to take the signal cleanly
416 * and report that.
417 */
418 sp &= ~15UL;
419
420 return (void __user *) sp;
421}
422
423/* The I-cache flush instruction only works in the primary ASI, which
424 * right now is the nucleus, aka. kernel space.
425 *
426 * Therefore we have to kick the instructions out using the kernel
427 * side linear mapping of the physical address backing the user
428 * instructions.
429 */
430static void flush_signal_insns(unsigned long address)
431{
432 unsigned long pstate, paddr;
433 pte_t *ptep, pte;
434 pgd_t *pgdp;
435 pud_t *pudp;
436 pmd_t *pmdp;
437
438 /* Commit all stores of the instructions we are about to flush. */
439 wmb();
440
441 /* Disable cross-call reception. In this way even a very wide
442 * munmap() on another cpu can't tear down the page table
443 * hierarchy from underneath us, since that can't complete
444 * until the IPI tlb flush returns.
445 */
446
447 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
448 __asm__ __volatile__("wrpr %0, %1, %%pstate"
449 : : "r" (pstate), "i" (PSTATE_IE));
450
451 pgdp = pgd_offset(current->mm, address);
452 if (pgd_none(*pgdp))
453 goto out_irqs_on;
454 pudp = pud_offset(pgdp, address);
455 if (pud_none(*pudp))
456 goto out_irqs_on;
457 pmdp = pmd_offset(pudp, address);
458 if (pmd_none(*pmdp))
459 goto out_irqs_on;
460
461 ptep = pte_offset_map(pmdp, address);
462 pte = *ptep;
463 if (!pte_present(pte))
464 goto out_unmap;
465
466 paddr = (unsigned long) page_address(pte_page(pte));
467
468 __asm__ __volatile__("flush %0 + %1"
469 : /* no outputs */
470 : "r" (paddr),
471 "r" (address & (PAGE_SIZE - 1))
472 : "memory");
473
474out_unmap:
475 pte_unmap(ptep);
476out_irqs_on:
477 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
478
479}
480
481static int setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
482 int signo, sigset_t *oldset)
483{
484 struct signal_frame32 __user *sf;
485 int i, err, wsaved;
486 void __user *tail;
487 int sigframe_size;
488 u32 psr;
489 unsigned int seta[_COMPAT_NSIG_WORDS];
490
491 /* 1. Make sure everything is clean */
492 synchronize_user_stack();
493 save_and_clear_fpu();
494
495 wsaved = get_thread_wsaved();
496
497 sigframe_size = sizeof(*sf);
498 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
499 sigframe_size += sizeof(__siginfo_fpu_t);
500 if (wsaved)
501 sigframe_size += sizeof(__siginfo_rwin_t);
502
503 sf = (struct signal_frame32 __user *)
504 get_sigframe(&ka->sa, regs, sigframe_size);
505
506 if (invalid_frame_pointer(sf, sigframe_size))
507 goto sigill;
508
509 tail = (sf + 1);
510
511 /* 2. Save the current process state */
512 if (test_thread_flag(TIF_32BIT)) {
513 regs->tpc &= 0xffffffff;
514 regs->tnpc &= 0xffffffff;
515 }
516 err = put_user(regs->tpc, &sf->info.si_regs.pc);
517 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
518 err |= __put_user(regs->y, &sf->info.si_regs.y);
519 psr = tstate_to_psr(regs->tstate);
520 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
521 psr |= PSR_EF;
522 err |= __put_user(psr, &sf->info.si_regs.psr);
523 for (i = 0; i < 16; i++)
524 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
525 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
526 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
527 for (i = 1; i < 16; i++)
528 err |= __put_user(((u32 *)regs->u_regs)[2*i],
529 &sf->v8plus.g_upper[i]);
530 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
531 &sf->v8plus.asi);
532
533 if (psr & PSR_EF) {
534 __siginfo_fpu_t __user *fp = tail;
535 tail += sizeof(*fp);
536 err |= save_fpu_state(regs, fp);
537 err |= __put_user((u64)fp, &sf->fpu_save);
538 } else {
539 err |= __put_user(0, &sf->fpu_save);
540 }
541 if (wsaved) {
542 __siginfo_rwin_t __user *rwp = tail;
543 tail += sizeof(*rwp);
544 err |= save_rwin_state(wsaved, rwp);
545 err |= __put_user((u64)rwp, &sf->rwin_save);
546 set_thread_wsaved(0);
547 } else {
548 err |= __put_user(0, &sf->rwin_save);
549 }
550
551 switch (_NSIG_WORDS) {
552 case 4: seta[7] = (oldset->sig[3] >> 32);
553 seta[6] = oldset->sig[3];
554 case 3: seta[5] = (oldset->sig[2] >> 32);
555 seta[4] = oldset->sig[2];
556 case 2: seta[3] = (oldset->sig[1] >> 32);
557 seta[2] = oldset->sig[1];
558 case 1: seta[1] = (oldset->sig[0] >> 32);
559 seta[0] = oldset->sig[0];
560 }
561 err |= __put_user(seta[0], &sf->info.si_mask);
562 err |= __copy_to_user(sf->extramask, seta + 1,
563 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
564
565 if (!wsaved) {
566 err |= copy_in_user((u32 __user *)sf,
567 (u32 __user *)(regs->u_regs[UREG_FP]),
568 sizeof(struct reg_window32));
569 } else {
570 struct reg_window *rp;
571
572 rp = ¤t_thread_info()->reg_window[wsaved - 1];
573 for (i = 0; i < 8; i++)
574 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
575 for (i = 0; i < 6; i++)
576 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
577 err |= __put_user(rp->ins[6], &sf->ss.fp);
578 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
579 }
580 if (err)
581 goto sigsegv;
582
583 /* 3. signal handler back-trampoline and parameters */
584 regs->u_regs[UREG_FP] = (unsigned long) sf;
585 regs->u_regs[UREG_I0] = signo;
586 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
587 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
588
589 /* 4. signal handler */
590 regs->tpc = (unsigned long) ka->sa.sa_handler;
591 regs->tnpc = (regs->tpc + 4);
592 if (test_thread_flag(TIF_32BIT)) {
593 regs->tpc &= 0xffffffff;
594 regs->tnpc &= 0xffffffff;
595 }
596
597 /* 5. return to kernel instructions */
598 if (ka->ka_restorer) {
599 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
600 } else {
601 unsigned long address = ((unsigned long)&(sf->insns[0]));
602
603 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
604
605 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
606 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
607 if (err)
608 goto sigsegv;
609 flush_signal_insns(address);
610 }
611 return 0;
612
613sigill:
614 do_exit(SIGILL);
615 return -EINVAL;
616
617sigsegv:
618 force_sigsegv(signo, current);
619 return -EFAULT;
620}
621
622static int setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
623 unsigned long signr, sigset_t *oldset,
624 siginfo_t *info)
625{
626 struct rt_signal_frame32 __user *sf;
627 int i, err, wsaved;
628 void __user *tail;
629 int sigframe_size;
630 u32 psr;
631 compat_sigset_t seta;
632
633 /* 1. Make sure everything is clean */
634 synchronize_user_stack();
635 save_and_clear_fpu();
636
637 wsaved = get_thread_wsaved();
638
639 sigframe_size = sizeof(*sf);
640 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
641 sigframe_size += sizeof(__siginfo_fpu_t);
642 if (wsaved)
643 sigframe_size += sizeof(__siginfo_rwin_t);
644
645 sf = (struct rt_signal_frame32 __user *)
646 get_sigframe(&ka->sa, regs, sigframe_size);
647
648 if (invalid_frame_pointer(sf, sigframe_size))
649 goto sigill;
650
651 tail = (sf + 1);
652
653 /* 2. Save the current process state */
654 if (test_thread_flag(TIF_32BIT)) {
655 regs->tpc &= 0xffffffff;
656 regs->tnpc &= 0xffffffff;
657 }
658 err = put_user(regs->tpc, &sf->regs.pc);
659 err |= __put_user(regs->tnpc, &sf->regs.npc);
660 err |= __put_user(regs->y, &sf->regs.y);
661 psr = tstate_to_psr(regs->tstate);
662 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
663 psr |= PSR_EF;
664 err |= __put_user(psr, &sf->regs.psr);
665 for (i = 0; i < 16; i++)
666 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
667 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
668 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
669 for (i = 1; i < 16; i++)
670 err |= __put_user(((u32 *)regs->u_regs)[2*i],
671 &sf->v8plus.g_upper[i]);
672 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
673 &sf->v8plus.asi);
674
675 if (psr & PSR_EF) {
676 __siginfo_fpu_t __user *fp = tail;
677 tail += sizeof(*fp);
678 err |= save_fpu_state(regs, fp);
679 err |= __put_user((u64)fp, &sf->fpu_save);
680 } else {
681 err |= __put_user(0, &sf->fpu_save);
682 }
683 if (wsaved) {
684 __siginfo_rwin_t __user *rwp = tail;
685 tail += sizeof(*rwp);
686 err |= save_rwin_state(wsaved, rwp);
687 err |= __put_user((u64)rwp, &sf->rwin_save);
688 set_thread_wsaved(0);
689 } else {
690 err |= __put_user(0, &sf->rwin_save);
691 }
692
693 /* Update the siginfo structure. */
694 err |= copy_siginfo_to_user32(&sf->info, info);
695
696 /* Setup sigaltstack */
697 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
698 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
699 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
700
701 switch (_NSIG_WORDS) {
702 case 4: seta.sig[7] = (oldset->sig[3] >> 32);
703 seta.sig[6] = oldset->sig[3];
704 case 3: seta.sig[5] = (oldset->sig[2] >> 32);
705 seta.sig[4] = oldset->sig[2];
706 case 2: seta.sig[3] = (oldset->sig[1] >> 32);
707 seta.sig[2] = oldset->sig[1];
708 case 1: seta.sig[1] = (oldset->sig[0] >> 32);
709 seta.sig[0] = oldset->sig[0];
710 }
711 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
712
713 if (!wsaved) {
714 err |= copy_in_user((u32 __user *)sf,
715 (u32 __user *)(regs->u_regs[UREG_FP]),
716 sizeof(struct reg_window32));
717 } else {
718 struct reg_window *rp;
719
720 rp = ¤t_thread_info()->reg_window[wsaved - 1];
721 for (i = 0; i < 8; i++)
722 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
723 for (i = 0; i < 6; i++)
724 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
725 err |= __put_user(rp->ins[6], &sf->ss.fp);
726 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
727 }
728 if (err)
729 goto sigsegv;
730
731 /* 3. signal handler back-trampoline and parameters */
732 regs->u_regs[UREG_FP] = (unsigned long) sf;
733 regs->u_regs[UREG_I0] = signr;
734 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
735 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
736
737 /* 4. signal handler */
738 regs->tpc = (unsigned long) ka->sa.sa_handler;
739 regs->tnpc = (regs->tpc + 4);
740 if (test_thread_flag(TIF_32BIT)) {
741 regs->tpc &= 0xffffffff;
742 regs->tnpc &= 0xffffffff;
743 }
744
745 /* 5. return to kernel instructions */
746 if (ka->ka_restorer)
747 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
748 else {
749 unsigned long address = ((unsigned long)&(sf->insns[0]));
750
751 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
752
753 /* mov __NR_rt_sigreturn, %g1 */
754 err |= __put_user(0x82102065, &sf->insns[0]);
755
756 /* t 0x10 */
757 err |= __put_user(0x91d02010, &sf->insns[1]);
758 if (err)
759 goto sigsegv;
760
761 flush_signal_insns(address);
762 }
763 return 0;
764
765sigill:
766 do_exit(SIGILL);
767 return -EINVAL;
768
769sigsegv:
770 force_sigsegv(signr, current);
771 return -EFAULT;
772}
773
774static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka,
775 siginfo_t *info,
776 sigset_t *oldset, struct pt_regs *regs)
777{
778 int err;
779
780 if (ka->sa.sa_flags & SA_SIGINFO)
781 err = setup_rt_frame32(ka, regs, signr, oldset, info);
782 else
783 err = setup_frame32(ka, regs, signr, oldset);
784
785 if (err)
786 return;
787
788 signal_delivered(signr, info, ka, regs, 0);
789}
790
791static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
792 struct sigaction *sa)
793{
794 switch (regs->u_regs[UREG_I0]) {
795 case ERESTART_RESTARTBLOCK:
796 case ERESTARTNOHAND:
797 no_system_call_restart:
798 regs->u_regs[UREG_I0] = EINTR;
799 regs->tstate |= TSTATE_ICARRY;
800 break;
801 case ERESTARTSYS:
802 if (!(sa->sa_flags & SA_RESTART))
803 goto no_system_call_restart;
804 /* fallthrough */
805 case ERESTARTNOINTR:
806 regs->u_regs[UREG_I0] = orig_i0;
807 regs->tpc -= 4;
808 regs->tnpc -= 4;
809 }
810}
811
812/* Note that 'init' is a special process: it doesn't get signals it doesn't
813 * want to handle. Thus you cannot kill init even with a SIGKILL even by
814 * mistake.
815 */
816void do_signal32(sigset_t *oldset, struct pt_regs * regs)
817{
818 struct k_sigaction ka;
819 unsigned long orig_i0;
820 int restart_syscall;
821 siginfo_t info;
822 int signr;
823
824 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
825
826 restart_syscall = 0;
827 orig_i0 = 0;
828 if (pt_regs_is_syscall(regs) &&
829 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
830 restart_syscall = 1;
831 orig_i0 = regs->u_regs[UREG_G6];
832 }
833
834 if (signr > 0) {
835 if (restart_syscall)
836 syscall_restart32(orig_i0, regs, &ka.sa);
837 handle_signal32(signr, &ka, &info, oldset, regs);
838 return;
839 }
840 if (restart_syscall &&
841 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
842 regs->u_regs[UREG_I0] == ERESTARTSYS ||
843 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
844 /* replay the system call when we are done */
845 regs->u_regs[UREG_I0] = orig_i0;
846 regs->tpc -= 4;
847 regs->tnpc -= 4;
848 pt_regs_clear_syscall(regs);
849 }
850 if (restart_syscall &&
851 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
852 regs->u_regs[UREG_G1] = __NR_restart_syscall;
853 regs->tpc -= 4;
854 regs->tnpc -= 4;
855 pt_regs_clear_syscall(regs);
856 }
857
858 /* If there's no signal to deliver, we just put the saved sigmask
859 * back
860 */
861 restore_saved_sigmask();
862}
863
864struct sigstack32 {
865 u32 the_stack;
866 int cur_status;
867};
868
869asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
870{
871 struct sigstack32 __user *ssptr =
872 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
873 struct sigstack32 __user *ossptr =
874 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
875 int ret = -EFAULT;
876
877 /* First see if old state is wanted. */
878 if (ossptr) {
879 if (put_user(current->sas_ss_sp + current->sas_ss_size,
880 &ossptr->the_stack) ||
881 __put_user(on_sig_stack(sp), &ossptr->cur_status))
882 goto out;
883 }
884
885 /* Now see if we want to update the new state. */
886 if (ssptr) {
887 u32 ss_sp;
888
889 if (get_user(ss_sp, &ssptr->the_stack))
890 goto out;
891
892 /* If the current stack was set with sigaltstack, don't
893 * swap stacks while we are on it.
894 */
895 ret = -EPERM;
896 if (current->sas_ss_sp && on_sig_stack(sp))
897 goto out;
898
899 /* Since we don't know the extent of the stack, and we don't
900 * track onstack-ness, but rather calculate it, we must
901 * presume a size. Ho hum this interface is lossy.
902 */
903 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
904 current->sas_ss_size = SIGSTKSZ;
905 }
906
907 ret = 0;
908out:
909 return ret;
910}
911
912asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp)
913{
914 stack_t uss, uoss;
915 u32 u_ss_sp = 0;
916 int ret;
917 mm_segment_t old_fs;
918 stack_t32 __user *uss32 = compat_ptr(ussa);
919 stack_t32 __user *uoss32 = compat_ptr(uossa);
920
921 if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) ||
922 __get_user(uss.ss_flags, &uss32->ss_flags) ||
923 __get_user(uss.ss_size, &uss32->ss_size)))
924 return -EFAULT;
925 uss.ss_sp = compat_ptr(u_ss_sp);
926 old_fs = get_fs();
927 set_fs(KERNEL_DS);
928 ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL,
929 uossa ? (stack_t __user *) &uoss : NULL, sp);
930 set_fs(old_fs);
931 if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) ||
932 __put_user(uoss.ss_flags, &uoss32->ss_flags) ||
933 __put_user(uoss.ss_size, &uoss32->ss_size)))
934 return -EFAULT;
935 return ret;
936}
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}