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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
57struct rt_signal_frame32 {
58 struct sparc_stackf32 ss;
59 compat_siginfo_t info;
60 struct pt_regs32 regs;
61 compat_sigset_t mask;
62 /* __siginfo_fpu_t * */ u32 fpu_save;
63 unsigned int insns[2];
64 compat_stack_t stack;
65 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
66 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
67 siginfo_extra_v8plus_t v8plus;
68 /* __siginfo_rwin_t * */u32 rwin_save;
69} __attribute__((aligned(8)));
70
71int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
72{
73 int err;
74
75 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
76 return -EFAULT;
77
78 /* If you change siginfo_t structure, please be sure
79 this code is fixed accordingly.
80 It should never copy any pad contained in the structure
81 to avoid security leaks, but must copy the generic
82 3 ints plus the relevant union member.
83 This routine must convert siginfo from 64bit to 32bit as well
84 at the same time. */
85 err = __put_user(from->si_signo, &to->si_signo);
86 err |= __put_user(from->si_errno, &to->si_errno);
87 err |= __put_user((short)from->si_code, &to->si_code);
88 if (from->si_code < 0)
89 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
90 else {
91 switch (from->si_code >> 16) {
92 case __SI_TIMER >> 16:
93 err |= __put_user(from->si_tid, &to->si_tid);
94 err |= __put_user(from->si_overrun, &to->si_overrun);
95 err |= __put_user(from->si_int, &to->si_int);
96 break;
97 case __SI_CHLD >> 16:
98 err |= __put_user(from->si_utime, &to->si_utime);
99 err |= __put_user(from->si_stime, &to->si_stime);
100 err |= __put_user(from->si_status, &to->si_status);
101 default:
102 err |= __put_user(from->si_pid, &to->si_pid);
103 err |= __put_user(from->si_uid, &to->si_uid);
104 break;
105 case __SI_FAULT >> 16:
106 err |= __put_user(from->si_trapno, &to->si_trapno);
107 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
108 break;
109 case __SI_POLL >> 16:
110 err |= __put_user(from->si_band, &to->si_band);
111 err |= __put_user(from->si_fd, &to->si_fd);
112 break;
113 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
114 case __SI_MESGQ >> 16:
115 err |= __put_user(from->si_pid, &to->si_pid);
116 err |= __put_user(from->si_uid, &to->si_uid);
117 err |= __put_user(from->si_int, &to->si_int);
118 break;
119 }
120 }
121 return err;
122}
123
124/* CAUTION: This is just a very minimalist implementation for the
125 * sake of compat_sys_rt_sigqueueinfo()
126 */
127int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
128{
129 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
130 return -EFAULT;
131
132 if (copy_from_user(to, from, 3*sizeof(int)) ||
133 copy_from_user(to->_sifields._pad, from->_sifields._pad,
134 SI_PAD_SIZE))
135 return -EFAULT;
136
137 return 0;
138}
139
140void do_sigreturn32(struct pt_regs *regs)
141{
142 struct signal_frame32 __user *sf;
143 compat_uptr_t fpu_save;
144 compat_uptr_t rwin_save;
145 unsigned int psr;
146 unsigned pc, npc;
147 sigset_t set;
148 unsigned seta[_COMPAT_NSIG_WORDS];
149 int err, i;
150
151 /* Always make any pending restarted system calls return -EINTR */
152 current_thread_info()->restart_block.fn = do_no_restart_syscall;
153
154 synchronize_user_stack();
155
156 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
157 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
158
159 /* 1. Make sure we are not getting garbage from the user */
160 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
161 (((unsigned long) sf) & 3))
162 goto segv;
163
164 if (get_user(pc, &sf->info.si_regs.pc) ||
165 __get_user(npc, &sf->info.si_regs.npc))
166 goto segv;
167
168 if ((pc | npc) & 3)
169 goto segv;
170
171 if (test_thread_flag(TIF_32BIT)) {
172 pc &= 0xffffffff;
173 npc &= 0xffffffff;
174 }
175 regs->tpc = pc;
176 regs->tnpc = npc;
177
178 /* 2. Restore the state */
179 err = __get_user(regs->y, &sf->info.si_regs.y);
180 err |= __get_user(psr, &sf->info.si_regs.psr);
181
182 for (i = UREG_G1; i <= UREG_I7; i++)
183 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
184 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
185 err |= __get_user(i, &sf->v8plus.g_upper[0]);
186 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
187 unsigned long asi;
188
189 for (i = UREG_G1; i <= UREG_I7; i++)
190 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
191 err |= __get_user(asi, &sf->v8plus.asi);
192 regs->tstate &= ~TSTATE_ASI;
193 regs->tstate |= ((asi & 0xffUL) << 24UL);
194 }
195 }
196
197 /* User can only change condition codes in %tstate. */
198 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
199 regs->tstate |= psr_to_tstate_icc(psr);
200
201 /* Prevent syscall restart. */
202 pt_regs_clear_syscall(regs);
203
204 err |= __get_user(fpu_save, &sf->fpu_save);
205 if (!err && fpu_save)
206 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
207 err |= __get_user(rwin_save, &sf->rwin_save);
208 if (!err && rwin_save) {
209 if (restore_rwin_state(compat_ptr(rwin_save)))
210 goto segv;
211 }
212 err |= __get_user(seta[0], &sf->info.si_mask);
213 err |= copy_from_user(seta+1, &sf->extramask,
214 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
215 if (err)
216 goto segv;
217 switch (_NSIG_WORDS) {
218 case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
219 case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
220 case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
221 case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
222 }
223 set_current_blocked(&set);
224 return;
225
226segv:
227 force_sig(SIGSEGV, current);
228}
229
230asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
231{
232 struct rt_signal_frame32 __user *sf;
233 unsigned int psr, pc, npc;
234 compat_uptr_t fpu_save;
235 compat_uptr_t rwin_save;
236 sigset_t set;
237 compat_sigset_t seta;
238 int err, i;
239
240 /* Always make any pending restarted system calls return -EINTR */
241 current_thread_info()->restart_block.fn = do_no_restart_syscall;
242
243 synchronize_user_stack();
244 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
245 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
246
247 /* 1. Make sure we are not getting garbage from the user */
248 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
249 (((unsigned long) sf) & 3))
250 goto segv;
251
252 if (get_user(pc, &sf->regs.pc) ||
253 __get_user(npc, &sf->regs.npc))
254 goto segv;
255
256 if ((pc | npc) & 3)
257 goto segv;
258
259 if (test_thread_flag(TIF_32BIT)) {
260 pc &= 0xffffffff;
261 npc &= 0xffffffff;
262 }
263 regs->tpc = pc;
264 regs->tnpc = npc;
265
266 /* 2. Restore the state */
267 err = __get_user(regs->y, &sf->regs.y);
268 err |= __get_user(psr, &sf->regs.psr);
269
270 for (i = UREG_G1; i <= UREG_I7; i++)
271 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
272 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
273 err |= __get_user(i, &sf->v8plus.g_upper[0]);
274 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
275 unsigned long asi;
276
277 for (i = UREG_G1; i <= UREG_I7; i++)
278 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
279 err |= __get_user(asi, &sf->v8plus.asi);
280 regs->tstate &= ~TSTATE_ASI;
281 regs->tstate |= ((asi & 0xffUL) << 24UL);
282 }
283 }
284
285 /* User can only change condition codes in %tstate. */
286 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
287 regs->tstate |= psr_to_tstate_icc(psr);
288
289 /* Prevent syscall restart. */
290 pt_regs_clear_syscall(regs);
291
292 err |= __get_user(fpu_save, &sf->fpu_save);
293 if (!err && fpu_save)
294 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
295 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
296 err |= compat_restore_altstack(&sf->stack);
297 if (err)
298 goto segv;
299
300 err |= __get_user(rwin_save, &sf->rwin_save);
301 if (!err && rwin_save) {
302 if (restore_rwin_state(compat_ptr(rwin_save)))
303 goto segv;
304 }
305
306 switch (_NSIG_WORDS) {
307 case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32);
308 case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32);
309 case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32);
310 case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
311 }
312 set_current_blocked(&set);
313 return;
314segv:
315 force_sig(SIGSEGV, current);
316}
317
318/* Checks if the fp is valid */
319static int invalid_frame_pointer(void __user *fp, int fplen)
320{
321 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
322 return 1;
323 return 0;
324}
325
326static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
327{
328 unsigned long sp;
329
330 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
331 sp = regs->u_regs[UREG_FP];
332
333 /*
334 * If we are on the alternate signal stack and would overflow it, don't.
335 * Return an always-bogus address instead so we will die with SIGSEGV.
336 */
337 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
338 return (void __user *) -1L;
339
340 /* This is the X/Open sanctioned signal stack switching. */
341 sp = sigsp(sp, ksig) - framesize;
342
343 /* Always align the stack frame. This handles two cases. First,
344 * sigaltstack need not be mindful of platform specific stack
345 * alignment. Second, if we took this signal because the stack
346 * is not aligned properly, we'd like to take the signal cleanly
347 * and report that.
348 */
349 sp &= ~15UL;
350
351 return (void __user *) sp;
352}
353
354/* The I-cache flush instruction only works in the primary ASI, which
355 * right now is the nucleus, aka. kernel space.
356 *
357 * Therefore we have to kick the instructions out using the kernel
358 * side linear mapping of the physical address backing the user
359 * instructions.
360 */
361static void flush_signal_insns(unsigned long address)
362{
363 unsigned long pstate, paddr;
364 pte_t *ptep, pte;
365 pgd_t *pgdp;
366 pud_t *pudp;
367 pmd_t *pmdp;
368
369 /* Commit all stores of the instructions we are about to flush. */
370 wmb();
371
372 /* Disable cross-call reception. In this way even a very wide
373 * munmap() on another cpu can't tear down the page table
374 * hierarchy from underneath us, since that can't complete
375 * until the IPI tlb flush returns.
376 */
377
378 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
379 __asm__ __volatile__("wrpr %0, %1, %%pstate"
380 : : "r" (pstate), "i" (PSTATE_IE));
381
382 pgdp = pgd_offset(current->mm, address);
383 if (pgd_none(*pgdp))
384 goto out_irqs_on;
385 pudp = pud_offset(pgdp, address);
386 if (pud_none(*pudp))
387 goto out_irqs_on;
388 pmdp = pmd_offset(pudp, address);
389 if (pmd_none(*pmdp))
390 goto out_irqs_on;
391
392 ptep = pte_offset_map(pmdp, address);
393 pte = *ptep;
394 if (!pte_present(pte))
395 goto out_unmap;
396
397 paddr = (unsigned long) page_address(pte_page(pte));
398
399 __asm__ __volatile__("flush %0 + %1"
400 : /* no outputs */
401 : "r" (paddr),
402 "r" (address & (PAGE_SIZE - 1))
403 : "memory");
404
405out_unmap:
406 pte_unmap(ptep);
407out_irqs_on:
408 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
409
410}
411
412static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
413 sigset_t *oldset)
414{
415 struct signal_frame32 __user *sf;
416 int i, err, wsaved;
417 void __user *tail;
418 int sigframe_size;
419 u32 psr;
420 unsigned int seta[_COMPAT_NSIG_WORDS];
421
422 /* 1. Make sure everything is clean */
423 synchronize_user_stack();
424 save_and_clear_fpu();
425
426 wsaved = get_thread_wsaved();
427
428 sigframe_size = sizeof(*sf);
429 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
430 sigframe_size += sizeof(__siginfo_fpu_t);
431 if (wsaved)
432 sigframe_size += sizeof(__siginfo_rwin_t);
433
434 sf = (struct signal_frame32 __user *)
435 get_sigframe(ksig, regs, sigframe_size);
436
437 if (invalid_frame_pointer(sf, sigframe_size)) {
438 do_exit(SIGILL);
439 return -EINVAL;
440 }
441
442 tail = (sf + 1);
443
444 /* 2. Save the current process state */
445 if (test_thread_flag(TIF_32BIT)) {
446 regs->tpc &= 0xffffffff;
447 regs->tnpc &= 0xffffffff;
448 }
449 err = put_user(regs->tpc, &sf->info.si_regs.pc);
450 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
451 err |= __put_user(regs->y, &sf->info.si_regs.y);
452 psr = tstate_to_psr(regs->tstate);
453 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
454 psr |= PSR_EF;
455 err |= __put_user(psr, &sf->info.si_regs.psr);
456 for (i = 0; i < 16; i++)
457 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
458 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
459 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
460 for (i = 1; i < 16; i++)
461 err |= __put_user(((u32 *)regs->u_regs)[2*i],
462 &sf->v8plus.g_upper[i]);
463 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
464 &sf->v8plus.asi);
465
466 if (psr & PSR_EF) {
467 __siginfo_fpu_t __user *fp = tail;
468 tail += sizeof(*fp);
469 err |= save_fpu_state(regs, fp);
470 err |= __put_user((u64)fp, &sf->fpu_save);
471 } else {
472 err |= __put_user(0, &sf->fpu_save);
473 }
474 if (wsaved) {
475 __siginfo_rwin_t __user *rwp = tail;
476 tail += sizeof(*rwp);
477 err |= save_rwin_state(wsaved, rwp);
478 err |= __put_user((u64)rwp, &sf->rwin_save);
479 set_thread_wsaved(0);
480 } else {
481 err |= __put_user(0, &sf->rwin_save);
482 }
483
484 switch (_NSIG_WORDS) {
485 case 4: seta[7] = (oldset->sig[3] >> 32);
486 seta[6] = oldset->sig[3];
487 case 3: seta[5] = (oldset->sig[2] >> 32);
488 seta[4] = oldset->sig[2];
489 case 2: seta[3] = (oldset->sig[1] >> 32);
490 seta[2] = oldset->sig[1];
491 case 1: seta[1] = (oldset->sig[0] >> 32);
492 seta[0] = oldset->sig[0];
493 }
494 err |= __put_user(seta[0], &sf->info.si_mask);
495 err |= __copy_to_user(sf->extramask, seta + 1,
496 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
497
498 if (!wsaved) {
499 err |= copy_in_user((u32 __user *)sf,
500 (u32 __user *)(regs->u_regs[UREG_FP]),
501 sizeof(struct reg_window32));
502 } else {
503 struct reg_window *rp;
504
505 rp = ¤t_thread_info()->reg_window[wsaved - 1];
506 for (i = 0; i < 8; i++)
507 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
508 for (i = 0; i < 6; i++)
509 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
510 err |= __put_user(rp->ins[6], &sf->ss.fp);
511 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
512 }
513 if (err)
514 return err;
515
516 /* 3. signal handler back-trampoline and parameters */
517 regs->u_regs[UREG_FP] = (unsigned long) sf;
518 regs->u_regs[UREG_I0] = ksig->sig;
519 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
520 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
521
522 /* 4. signal handler */
523 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
524 regs->tnpc = (regs->tpc + 4);
525 if (test_thread_flag(TIF_32BIT)) {
526 regs->tpc &= 0xffffffff;
527 regs->tnpc &= 0xffffffff;
528 }
529
530 /* 5. return to kernel instructions */
531 if (ksig->ka.ka_restorer) {
532 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
533 } else {
534 unsigned long address = ((unsigned long)&(sf->insns[0]));
535
536 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
537
538 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
539 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
540 if (err)
541 return err;
542 flush_signal_insns(address);
543 }
544 return 0;
545}
546
547static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
548 sigset_t *oldset)
549{
550 struct rt_signal_frame32 __user *sf;
551 int i, err, wsaved;
552 void __user *tail;
553 int sigframe_size;
554 u32 psr;
555 compat_sigset_t seta;
556
557 /* 1. Make sure everything is clean */
558 synchronize_user_stack();
559 save_and_clear_fpu();
560
561 wsaved = get_thread_wsaved();
562
563 sigframe_size = sizeof(*sf);
564 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
565 sigframe_size += sizeof(__siginfo_fpu_t);
566 if (wsaved)
567 sigframe_size += sizeof(__siginfo_rwin_t);
568
569 sf = (struct rt_signal_frame32 __user *)
570 get_sigframe(ksig, regs, sigframe_size);
571
572 if (invalid_frame_pointer(sf, sigframe_size)) {
573 do_exit(SIGILL);
574 return -EINVAL;
575 }
576
577 tail = (sf + 1);
578
579 /* 2. Save the current process state */
580 if (test_thread_flag(TIF_32BIT)) {
581 regs->tpc &= 0xffffffff;
582 regs->tnpc &= 0xffffffff;
583 }
584 err = put_user(regs->tpc, &sf->regs.pc);
585 err |= __put_user(regs->tnpc, &sf->regs.npc);
586 err |= __put_user(regs->y, &sf->regs.y);
587 psr = tstate_to_psr(regs->tstate);
588 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
589 psr |= PSR_EF;
590 err |= __put_user(psr, &sf->regs.psr);
591 for (i = 0; i < 16; i++)
592 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
593 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
594 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
595 for (i = 1; i < 16; i++)
596 err |= __put_user(((u32 *)regs->u_regs)[2*i],
597 &sf->v8plus.g_upper[i]);
598 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
599 &sf->v8plus.asi);
600
601 if (psr & PSR_EF) {
602 __siginfo_fpu_t __user *fp = tail;
603 tail += sizeof(*fp);
604 err |= save_fpu_state(regs, fp);
605 err |= __put_user((u64)fp, &sf->fpu_save);
606 } else {
607 err |= __put_user(0, &sf->fpu_save);
608 }
609 if (wsaved) {
610 __siginfo_rwin_t __user *rwp = tail;
611 tail += sizeof(*rwp);
612 err |= save_rwin_state(wsaved, rwp);
613 err |= __put_user((u64)rwp, &sf->rwin_save);
614 set_thread_wsaved(0);
615 } else {
616 err |= __put_user(0, &sf->rwin_save);
617 }
618
619 /* Update the siginfo structure. */
620 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
621
622 /* Setup sigaltstack */
623 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
624
625 switch (_NSIG_WORDS) {
626 case 4: seta.sig[7] = (oldset->sig[3] >> 32);
627 seta.sig[6] = oldset->sig[3];
628 case 3: seta.sig[5] = (oldset->sig[2] >> 32);
629 seta.sig[4] = oldset->sig[2];
630 case 2: seta.sig[3] = (oldset->sig[1] >> 32);
631 seta.sig[2] = oldset->sig[1];
632 case 1: seta.sig[1] = (oldset->sig[0] >> 32);
633 seta.sig[0] = oldset->sig[0];
634 }
635 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
636
637 if (!wsaved) {
638 err |= copy_in_user((u32 __user *)sf,
639 (u32 __user *)(regs->u_regs[UREG_FP]),
640 sizeof(struct reg_window32));
641 } else {
642 struct reg_window *rp;
643
644 rp = ¤t_thread_info()->reg_window[wsaved - 1];
645 for (i = 0; i < 8; i++)
646 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
647 for (i = 0; i < 6; i++)
648 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
649 err |= __put_user(rp->ins[6], &sf->ss.fp);
650 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
651 }
652 if (err)
653 return err;
654
655 /* 3. signal handler back-trampoline and parameters */
656 regs->u_regs[UREG_FP] = (unsigned long) sf;
657 regs->u_regs[UREG_I0] = ksig->sig;
658 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
659 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
660
661 /* 4. signal handler */
662 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
663 regs->tnpc = (regs->tpc + 4);
664 if (test_thread_flag(TIF_32BIT)) {
665 regs->tpc &= 0xffffffff;
666 regs->tnpc &= 0xffffffff;
667 }
668
669 /* 5. return to kernel instructions */
670 if (ksig->ka.ka_restorer)
671 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
672 else {
673 unsigned long address = ((unsigned long)&(sf->insns[0]));
674
675 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
676
677 /* mov __NR_rt_sigreturn, %g1 */
678 err |= __put_user(0x82102065, &sf->insns[0]);
679
680 /* t 0x10 */
681 err |= __put_user(0x91d02010, &sf->insns[1]);
682 if (err)
683 return err;
684
685 flush_signal_insns(address);
686 }
687 return 0;
688}
689
690static inline void handle_signal32(struct ksignal *ksig,
691 struct pt_regs *regs)
692{
693 sigset_t *oldset = sigmask_to_save();
694 int err;
695
696 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
697 err = setup_rt_frame32(ksig, regs, oldset);
698 else
699 err = setup_frame32(ksig, regs, oldset);
700
701 signal_setup_done(err, ksig, 0);
702}
703
704static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
705 struct sigaction *sa)
706{
707 switch (regs->u_regs[UREG_I0]) {
708 case ERESTART_RESTARTBLOCK:
709 case ERESTARTNOHAND:
710 no_system_call_restart:
711 regs->u_regs[UREG_I0] = EINTR;
712 regs->tstate |= TSTATE_ICARRY;
713 break;
714 case ERESTARTSYS:
715 if (!(sa->sa_flags & SA_RESTART))
716 goto no_system_call_restart;
717 /* fallthrough */
718 case ERESTARTNOINTR:
719 regs->u_regs[UREG_I0] = orig_i0;
720 regs->tpc -= 4;
721 regs->tnpc -= 4;
722 }
723}
724
725/* Note that 'init' is a special process: it doesn't get signals it doesn't
726 * want to handle. Thus you cannot kill init even with a SIGKILL even by
727 * mistake.
728 */
729void do_signal32(struct pt_regs * regs)
730{
731 struct ksignal ksig;
732 unsigned long orig_i0 = 0;
733 int restart_syscall = 0;
734 bool has_handler = get_signal(&ksig);
735
736 if (pt_regs_is_syscall(regs) &&
737 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
738 restart_syscall = 1;
739 orig_i0 = regs->u_regs[UREG_G6];
740 }
741
742 if (has_handler) {
743 if (restart_syscall)
744 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
745 handle_signal32(&ksig, regs);
746 } else {
747 if (restart_syscall) {
748 switch (regs->u_regs[UREG_I0]) {
749 case ERESTARTNOHAND:
750 case ERESTARTSYS:
751 case ERESTARTNOINTR:
752 /* replay the system call when we are done */
753 regs->u_regs[UREG_I0] = orig_i0;
754 regs->tpc -= 4;
755 regs->tnpc -= 4;
756 pt_regs_clear_syscall(regs);
757 case ERESTART_RESTARTBLOCK:
758 regs->u_regs[UREG_G1] = __NR_restart_syscall;
759 regs->tpc -= 4;
760 regs->tnpc -= 4;
761 pt_regs_clear_syscall(regs);
762 }
763 }
764 restore_saved_sigmask();
765 }
766}
767
768struct sigstack32 {
769 u32 the_stack;
770 int cur_status;
771};
772
773asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
774{
775 struct sigstack32 __user *ssptr =
776 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
777 struct sigstack32 __user *ossptr =
778 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
779 int ret = -EFAULT;
780
781 /* First see if old state is wanted. */
782 if (ossptr) {
783 if (put_user(current->sas_ss_sp + current->sas_ss_size,
784 &ossptr->the_stack) ||
785 __put_user(on_sig_stack(sp), &ossptr->cur_status))
786 goto out;
787 }
788
789 /* Now see if we want to update the new state. */
790 if (ssptr) {
791 u32 ss_sp;
792
793 if (get_user(ss_sp, &ssptr->the_stack))
794 goto out;
795
796 /* If the current stack was set with sigaltstack, don't
797 * swap stacks while we are on it.
798 */
799 ret = -EPERM;
800 if (current->sas_ss_sp && on_sig_stack(sp))
801 goto out;
802
803 /* Since we don't know the extent of the stack, and we don't
804 * track onstack-ness, but rather calculate it, we must
805 * presume a size. Ho hum this interface is lossy.
806 */
807 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
808 current->sas_ss_size = SIGSTKSZ;
809 }
810
811 ret = 0;
812out:
813 return ret;
814}
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}