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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 <linux/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
141/* Checks if the fp is valid. We always build signal frames which are
142 * 16-byte aligned, therefore we can always enforce that the restore
143 * frame has that property as well.
144 */
145static bool invalid_frame_pointer(void __user *fp, int fplen)
146{
147 if ((((unsigned long) fp) & 15) ||
148 ((unsigned long)fp) > 0x100000000ULL - fplen)
149 return true;
150 return false;
151}
152
153void do_sigreturn32(struct pt_regs *regs)
154{
155 struct signal_frame32 __user *sf;
156 compat_uptr_t fpu_save;
157 compat_uptr_t rwin_save;
158 unsigned int psr, ufp;
159 unsigned int pc, npc;
160 sigset_t set;
161 compat_sigset_t seta;
162 int err, i;
163
164 /* Always make any pending restarted system calls return -EINTR */
165 current->restart_block.fn = do_no_restart_syscall;
166
167 synchronize_user_stack();
168
169 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
170 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
171
172 /* 1. Make sure we are not getting garbage from the user */
173 if (invalid_frame_pointer(sf, sizeof(*sf)))
174 goto segv;
175
176 if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
177 goto segv;
178
179 if (ufp & 0x7)
180 goto segv;
181
182 if (__get_user(pc, &sf->info.si_regs.pc) ||
183 __get_user(npc, &sf->info.si_regs.npc))
184 goto segv;
185
186 if ((pc | npc) & 3)
187 goto segv;
188
189 if (test_thread_flag(TIF_32BIT)) {
190 pc &= 0xffffffff;
191 npc &= 0xffffffff;
192 }
193 regs->tpc = pc;
194 regs->tnpc = npc;
195
196 /* 2. Restore the state */
197 err = __get_user(regs->y, &sf->info.si_regs.y);
198 err |= __get_user(psr, &sf->info.si_regs.psr);
199
200 for (i = UREG_G1; i <= UREG_I7; i++)
201 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
202 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
203 err |= __get_user(i, &sf->v8plus.g_upper[0]);
204 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
205 unsigned long asi;
206
207 for (i = UREG_G1; i <= UREG_I7; i++)
208 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
209 err |= __get_user(asi, &sf->v8plus.asi);
210 regs->tstate &= ~TSTATE_ASI;
211 regs->tstate |= ((asi & 0xffUL) << 24UL);
212 }
213 }
214
215 /* User can only change condition codes in %tstate. */
216 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
217 regs->tstate |= psr_to_tstate_icc(psr);
218
219 /* Prevent syscall restart. */
220 pt_regs_clear_syscall(regs);
221
222 err |= __get_user(fpu_save, &sf->fpu_save);
223 if (!err && fpu_save)
224 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
225 err |= __get_user(rwin_save, &sf->rwin_save);
226 if (!err && rwin_save) {
227 if (restore_rwin_state(compat_ptr(rwin_save)))
228 goto segv;
229 }
230 err |= __get_user(seta.sig[0], &sf->info.si_mask);
231 err |= copy_from_user(&seta.sig[1], &sf->extramask,
232 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
233 if (err)
234 goto segv;
235
236 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
237 set_current_blocked(&set);
238 return;
239
240segv:
241 force_sig(SIGSEGV, current);
242}
243
244asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
245{
246 struct rt_signal_frame32 __user *sf;
247 unsigned int psr, pc, npc, ufp;
248 compat_uptr_t fpu_save;
249 compat_uptr_t rwin_save;
250 sigset_t set;
251 compat_sigset_t seta;
252 int err, i;
253
254 /* Always make any pending restarted system calls return -EINTR */
255 current->restart_block.fn = do_no_restart_syscall;
256
257 synchronize_user_stack();
258 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
259 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
260
261 /* 1. Make sure we are not getting garbage from the user */
262 if (invalid_frame_pointer(sf, sizeof(*sf)))
263 goto segv;
264
265 if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
266 goto segv;
267
268 if (ufp & 0x7)
269 goto segv;
270
271 if (__get_user(pc, &sf->regs.pc) ||
272 __get_user(npc, &sf->regs.npc))
273 goto segv;
274
275 if ((pc | npc) & 3)
276 goto segv;
277
278 if (test_thread_flag(TIF_32BIT)) {
279 pc &= 0xffffffff;
280 npc &= 0xffffffff;
281 }
282 regs->tpc = pc;
283 regs->tnpc = npc;
284
285 /* 2. Restore the state */
286 err = __get_user(regs->y, &sf->regs.y);
287 err |= __get_user(psr, &sf->regs.psr);
288
289 for (i = UREG_G1; i <= UREG_I7; i++)
290 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
291 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
292 err |= __get_user(i, &sf->v8plus.g_upper[0]);
293 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
294 unsigned long asi;
295
296 for (i = UREG_G1; i <= UREG_I7; i++)
297 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
298 err |= __get_user(asi, &sf->v8plus.asi);
299 regs->tstate &= ~TSTATE_ASI;
300 regs->tstate |= ((asi & 0xffUL) << 24UL);
301 }
302 }
303
304 /* User can only change condition codes in %tstate. */
305 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
306 regs->tstate |= psr_to_tstate_icc(psr);
307
308 /* Prevent syscall restart. */
309 pt_regs_clear_syscall(regs);
310
311 err |= __get_user(fpu_save, &sf->fpu_save);
312 if (!err && fpu_save)
313 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
314 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
315 err |= compat_restore_altstack(&sf->stack);
316 if (err)
317 goto segv;
318
319 err |= __get_user(rwin_save, &sf->rwin_save);
320 if (!err && rwin_save) {
321 if (restore_rwin_state(compat_ptr(rwin_save)))
322 goto segv;
323 }
324
325 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
326 set_current_blocked(&set);
327 return;
328segv:
329 force_sig(SIGSEGV, current);
330}
331
332static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
333{
334 unsigned long sp;
335
336 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
337 sp = regs->u_regs[UREG_FP];
338
339 /*
340 * If we are on the alternate signal stack and would overflow it, don't.
341 * Return an always-bogus address instead so we will die with SIGSEGV.
342 */
343 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
344 return (void __user *) -1L;
345
346 /* This is the X/Open sanctioned signal stack switching. */
347 sp = sigsp(sp, ksig) - framesize;
348
349 /* Always align the stack frame. This handles two cases. First,
350 * sigaltstack need not be mindful of platform specific stack
351 * alignment. Second, if we took this signal because the stack
352 * is not aligned properly, we'd like to take the signal cleanly
353 * and report that.
354 */
355 sp &= ~15UL;
356
357 return (void __user *) sp;
358}
359
360/* The I-cache flush instruction only works in the primary ASI, which
361 * right now is the nucleus, aka. kernel space.
362 *
363 * Therefore we have to kick the instructions out using the kernel
364 * side linear mapping of the physical address backing the user
365 * instructions.
366 */
367static void flush_signal_insns(unsigned long address)
368{
369 unsigned long pstate, paddr;
370 pte_t *ptep, pte;
371 pgd_t *pgdp;
372 pud_t *pudp;
373 pmd_t *pmdp;
374
375 /* Commit all stores of the instructions we are about to flush. */
376 wmb();
377
378 /* Disable cross-call reception. In this way even a very wide
379 * munmap() on another cpu can't tear down the page table
380 * hierarchy from underneath us, since that can't complete
381 * until the IPI tlb flush returns.
382 */
383
384 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
385 __asm__ __volatile__("wrpr %0, %1, %%pstate"
386 : : "r" (pstate), "i" (PSTATE_IE));
387
388 pgdp = pgd_offset(current->mm, address);
389 if (pgd_none(*pgdp))
390 goto out_irqs_on;
391 pudp = pud_offset(pgdp, address);
392 if (pud_none(*pudp))
393 goto out_irqs_on;
394 pmdp = pmd_offset(pudp, address);
395 if (pmd_none(*pmdp))
396 goto out_irqs_on;
397
398 ptep = pte_offset_map(pmdp, address);
399 pte = *ptep;
400 if (!pte_present(pte))
401 goto out_unmap;
402
403 paddr = (unsigned long) page_address(pte_page(pte));
404
405 __asm__ __volatile__("flush %0 + %1"
406 : /* no outputs */
407 : "r" (paddr),
408 "r" (address & (PAGE_SIZE - 1))
409 : "memory");
410
411out_unmap:
412 pte_unmap(ptep);
413out_irqs_on:
414 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
415
416}
417
418static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
419 sigset_t *oldset)
420{
421 struct signal_frame32 __user *sf;
422 int i, err, wsaved;
423 void __user *tail;
424 int sigframe_size;
425 u32 psr;
426 compat_sigset_t seta;
427
428 /* 1. Make sure everything is clean */
429 synchronize_user_stack();
430 save_and_clear_fpu();
431
432 wsaved = get_thread_wsaved();
433
434 sigframe_size = sizeof(*sf);
435 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
436 sigframe_size += sizeof(__siginfo_fpu_t);
437 if (wsaved)
438 sigframe_size += sizeof(__siginfo_rwin_t);
439
440 sf = (struct signal_frame32 __user *)
441 get_sigframe(ksig, regs, sigframe_size);
442
443 if (invalid_frame_pointer(sf, sigframe_size)) {
444 do_exit(SIGILL);
445 return -EINVAL;
446 }
447
448 tail = (sf + 1);
449
450 /* 2. Save the current process state */
451 if (test_thread_flag(TIF_32BIT)) {
452 regs->tpc &= 0xffffffff;
453 regs->tnpc &= 0xffffffff;
454 }
455 err = put_user(regs->tpc, &sf->info.si_regs.pc);
456 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
457 err |= __put_user(regs->y, &sf->info.si_regs.y);
458 psr = tstate_to_psr(regs->tstate);
459 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
460 psr |= PSR_EF;
461 err |= __put_user(psr, &sf->info.si_regs.psr);
462 for (i = 0; i < 16; i++)
463 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
464 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
465 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
466 for (i = 1; i < 16; i++)
467 err |= __put_user(((u32 *)regs->u_regs)[2*i],
468 &sf->v8plus.g_upper[i]);
469 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
470 &sf->v8plus.asi);
471
472 if (psr & PSR_EF) {
473 __siginfo_fpu_t __user *fp = tail;
474 tail += sizeof(*fp);
475 err |= save_fpu_state(regs, fp);
476 err |= __put_user((u64)fp, &sf->fpu_save);
477 } else {
478 err |= __put_user(0, &sf->fpu_save);
479 }
480 if (wsaved) {
481 __siginfo_rwin_t __user *rwp = tail;
482 tail += sizeof(*rwp);
483 err |= save_rwin_state(wsaved, rwp);
484 err |= __put_user((u64)rwp, &sf->rwin_save);
485 set_thread_wsaved(0);
486 } else {
487 err |= __put_user(0, &sf->rwin_save);
488 }
489
490 /* If these change we need to know - assignments to seta relies on these sizes */
491 BUILD_BUG_ON(_NSIG_WORDS != 1);
492 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
493 seta.sig[1] = (oldset->sig[0] >> 32);
494 seta.sig[0] = oldset->sig[0];
495
496 err |= __put_user(seta.sig[0], &sf->info.si_mask);
497 err |= __copy_to_user(sf->extramask, &seta.sig[1],
498 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
499
500 if (!wsaved) {
501 err |= copy_in_user((u32 __user *)sf,
502 (u32 __user *)(regs->u_regs[UREG_FP]),
503 sizeof(struct reg_window32));
504 } else {
505 struct reg_window *rp;
506
507 rp = ¤t_thread_info()->reg_window[wsaved - 1];
508 for (i = 0; i < 8; i++)
509 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
510 for (i = 0; i < 6; i++)
511 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
512 err |= __put_user(rp->ins[6], &sf->ss.fp);
513 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
514 }
515 if (err)
516 return err;
517
518 /* 3. signal handler back-trampoline and parameters */
519 regs->u_regs[UREG_FP] = (unsigned long) sf;
520 regs->u_regs[UREG_I0] = ksig->sig;
521 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
522 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
523
524 /* 4. signal handler */
525 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
526 regs->tnpc = (regs->tpc + 4);
527 if (test_thread_flag(TIF_32BIT)) {
528 regs->tpc &= 0xffffffff;
529 regs->tnpc &= 0xffffffff;
530 }
531
532 /* 5. return to kernel instructions */
533 if (ksig->ka.ka_restorer) {
534 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
535 } else {
536 unsigned long address = ((unsigned long)&(sf->insns[0]));
537
538 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
539
540 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
541 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
542 if (err)
543 return err;
544 flush_signal_insns(address);
545 }
546 return 0;
547}
548
549static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
550 sigset_t *oldset)
551{
552 struct rt_signal_frame32 __user *sf;
553 int i, err, wsaved;
554 void __user *tail;
555 int sigframe_size;
556 u32 psr;
557 compat_sigset_t seta;
558
559 /* 1. Make sure everything is clean */
560 synchronize_user_stack();
561 save_and_clear_fpu();
562
563 wsaved = get_thread_wsaved();
564
565 sigframe_size = sizeof(*sf);
566 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
567 sigframe_size += sizeof(__siginfo_fpu_t);
568 if (wsaved)
569 sigframe_size += sizeof(__siginfo_rwin_t);
570
571 sf = (struct rt_signal_frame32 __user *)
572 get_sigframe(ksig, regs, sigframe_size);
573
574 if (invalid_frame_pointer(sf, sigframe_size)) {
575 do_exit(SIGILL);
576 return -EINVAL;
577 }
578
579 tail = (sf + 1);
580
581 /* 2. Save the current process state */
582 if (test_thread_flag(TIF_32BIT)) {
583 regs->tpc &= 0xffffffff;
584 regs->tnpc &= 0xffffffff;
585 }
586 err = put_user(regs->tpc, &sf->regs.pc);
587 err |= __put_user(regs->tnpc, &sf->regs.npc);
588 err |= __put_user(regs->y, &sf->regs.y);
589 psr = tstate_to_psr(regs->tstate);
590 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
591 psr |= PSR_EF;
592 err |= __put_user(psr, &sf->regs.psr);
593 for (i = 0; i < 16; i++)
594 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
595 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
596 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
597 for (i = 1; i < 16; i++)
598 err |= __put_user(((u32 *)regs->u_regs)[2*i],
599 &sf->v8plus.g_upper[i]);
600 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
601 &sf->v8plus.asi);
602
603 if (psr & PSR_EF) {
604 __siginfo_fpu_t __user *fp = tail;
605 tail += sizeof(*fp);
606 err |= save_fpu_state(regs, fp);
607 err |= __put_user((u64)fp, &sf->fpu_save);
608 } else {
609 err |= __put_user(0, &sf->fpu_save);
610 }
611 if (wsaved) {
612 __siginfo_rwin_t __user *rwp = tail;
613 tail += sizeof(*rwp);
614 err |= save_rwin_state(wsaved, rwp);
615 err |= __put_user((u64)rwp, &sf->rwin_save);
616 set_thread_wsaved(0);
617 } else {
618 err |= __put_user(0, &sf->rwin_save);
619 }
620
621 /* Update the siginfo structure. */
622 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
623
624 /* Setup sigaltstack */
625 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
626
627 seta.sig[1] = (oldset->sig[0] >> 32);
628 seta.sig[0] = oldset->sig[0];
629 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
630
631 if (!wsaved) {
632 err |= copy_in_user((u32 __user *)sf,
633 (u32 __user *)(regs->u_regs[UREG_FP]),
634 sizeof(struct reg_window32));
635 } else {
636 struct reg_window *rp;
637
638 rp = ¤t_thread_info()->reg_window[wsaved - 1];
639 for (i = 0; i < 8; i++)
640 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
641 for (i = 0; i < 6; i++)
642 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
643 err |= __put_user(rp->ins[6], &sf->ss.fp);
644 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
645 }
646 if (err)
647 return err;
648
649 /* 3. signal handler back-trampoline and parameters */
650 regs->u_regs[UREG_FP] = (unsigned long) sf;
651 regs->u_regs[UREG_I0] = ksig->sig;
652 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
653 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
654
655 /* 4. signal handler */
656 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
657 regs->tnpc = (regs->tpc + 4);
658 if (test_thread_flag(TIF_32BIT)) {
659 regs->tpc &= 0xffffffff;
660 regs->tnpc &= 0xffffffff;
661 }
662
663 /* 5. return to kernel instructions */
664 if (ksig->ka.ka_restorer)
665 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
666 else {
667 unsigned long address = ((unsigned long)&(sf->insns[0]));
668
669 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
670
671 /* mov __NR_rt_sigreturn, %g1 */
672 err |= __put_user(0x82102065, &sf->insns[0]);
673
674 /* t 0x10 */
675 err |= __put_user(0x91d02010, &sf->insns[1]);
676 if (err)
677 return err;
678
679 flush_signal_insns(address);
680 }
681 return 0;
682}
683
684static inline void handle_signal32(struct ksignal *ksig,
685 struct pt_regs *regs)
686{
687 sigset_t *oldset = sigmask_to_save();
688 int err;
689
690 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
691 err = setup_rt_frame32(ksig, regs, oldset);
692 else
693 err = setup_frame32(ksig, regs, oldset);
694
695 signal_setup_done(err, ksig, 0);
696}
697
698static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
699 struct sigaction *sa)
700{
701 switch (regs->u_regs[UREG_I0]) {
702 case ERESTART_RESTARTBLOCK:
703 case ERESTARTNOHAND:
704 no_system_call_restart:
705 regs->u_regs[UREG_I0] = EINTR;
706 regs->tstate |= TSTATE_ICARRY;
707 break;
708 case ERESTARTSYS:
709 if (!(sa->sa_flags & SA_RESTART))
710 goto no_system_call_restart;
711 /* fallthrough */
712 case ERESTARTNOINTR:
713 regs->u_regs[UREG_I0] = orig_i0;
714 regs->tpc -= 4;
715 regs->tnpc -= 4;
716 }
717}
718
719/* Note that 'init' is a special process: it doesn't get signals it doesn't
720 * want to handle. Thus you cannot kill init even with a SIGKILL even by
721 * mistake.
722 */
723void do_signal32(struct pt_regs * regs)
724{
725 struct ksignal ksig;
726 unsigned long orig_i0 = 0;
727 int restart_syscall = 0;
728 bool has_handler = get_signal(&ksig);
729
730 if (pt_regs_is_syscall(regs) &&
731 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
732 restart_syscall = 1;
733 orig_i0 = regs->u_regs[UREG_G6];
734 }
735
736 if (has_handler) {
737 if (restart_syscall)
738 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
739 handle_signal32(&ksig, regs);
740 } else {
741 if (restart_syscall) {
742 switch (regs->u_regs[UREG_I0]) {
743 case ERESTARTNOHAND:
744 case ERESTARTSYS:
745 case ERESTARTNOINTR:
746 /* replay the system call when we are done */
747 regs->u_regs[UREG_I0] = orig_i0;
748 regs->tpc -= 4;
749 regs->tnpc -= 4;
750 pt_regs_clear_syscall(regs);
751 case ERESTART_RESTARTBLOCK:
752 regs->u_regs[UREG_G1] = __NR_restart_syscall;
753 regs->tpc -= 4;
754 regs->tnpc -= 4;
755 pt_regs_clear_syscall(regs);
756 }
757 }
758 restore_saved_sigmask();
759 }
760}
761
762struct sigstack32 {
763 u32 the_stack;
764 int cur_status;
765};
766
767asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
768{
769 struct sigstack32 __user *ssptr =
770 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
771 struct sigstack32 __user *ossptr =
772 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
773 int ret = -EFAULT;
774
775 /* First see if old state is wanted. */
776 if (ossptr) {
777 if (put_user(current->sas_ss_sp + current->sas_ss_size,
778 &ossptr->the_stack) ||
779 __put_user(on_sig_stack(sp), &ossptr->cur_status))
780 goto out;
781 }
782
783 /* Now see if we want to update the new state. */
784 if (ssptr) {
785 u32 ss_sp;
786
787 if (get_user(ss_sp, &ssptr->the_stack))
788 goto out;
789
790 /* If the current stack was set with sigaltstack, don't
791 * swap stacks while we are on it.
792 */
793 ret = -EPERM;
794 if (current->sas_ss_sp && on_sig_stack(sp))
795 goto out;
796
797 /* Since we don't know the extent of the stack, and we don't
798 * track onstack-ness, but rather calculate it, we must
799 * presume a size. Ho hum this interface is lossy.
800 */
801 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
802 current->sas_ss_size = SIGSTKSZ;
803 }
804
805 ret = 0;
806out:
807 return ret;
808}