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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 <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}
1// SPDX-License-Identifier: GPL-2.0
2/* arch/sparc64/kernel/signal32.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11#include <linux/sched.h>
12#include <linux/kernel.h>
13#include <linux/signal.h>
14#include <linux/errno.h>
15#include <linux/wait.h>
16#include <linux/ptrace.h>
17#include <linux/unistd.h>
18#include <linux/mm.h>
19#include <linux/tty.h>
20#include <linux/binfmts.h>
21#include <linux/compat.h>
22#include <linux/bitops.h>
23
24#include <linux/uaccess.h>
25#include <asm/ptrace.h>
26#include <asm/psrcompat.h>
27#include <asm/fpumacro.h>
28#include <asm/visasm.h>
29#include <asm/compat_signal.h>
30#include <asm/switch_to.h>
31
32#include "sigutil.h"
33#include "kernel.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
71/* Checks if the fp is valid. We always build signal frames which are
72 * 16-byte aligned, therefore we can always enforce that the restore
73 * frame has that property as well.
74 */
75static bool invalid_frame_pointer(void __user *fp, int fplen)
76{
77 if ((((unsigned long) fp) & 15) ||
78 ((unsigned long)fp) > 0x100000000ULL - fplen)
79 return true;
80 return false;
81}
82
83void do_sigreturn32(struct pt_regs *regs)
84{
85 struct signal_frame32 __user *sf;
86 compat_uptr_t fpu_save;
87 compat_uptr_t rwin_save;
88 unsigned int psr, ufp;
89 unsigned int pc, npc;
90 sigset_t set;
91 compat_sigset_t seta;
92 int err, i;
93
94 /* Always make any pending restarted system calls return -EINTR */
95 current->restart_block.fn = do_no_restart_syscall;
96
97 synchronize_user_stack();
98
99 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
100 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
101
102 /* 1. Make sure we are not getting garbage from the user */
103 if (invalid_frame_pointer(sf, sizeof(*sf)))
104 goto segv;
105
106 if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
107 goto segv;
108
109 if (ufp & 0x7)
110 goto segv;
111
112 if (__get_user(pc, &sf->info.si_regs.pc) ||
113 __get_user(npc, &sf->info.si_regs.npc))
114 goto segv;
115
116 if ((pc | npc) & 3)
117 goto segv;
118
119 if (test_thread_flag(TIF_32BIT)) {
120 pc &= 0xffffffff;
121 npc &= 0xffffffff;
122 }
123 regs->tpc = pc;
124 regs->tnpc = npc;
125
126 /* 2. Restore the state */
127 err = __get_user(regs->y, &sf->info.si_regs.y);
128 err |= __get_user(psr, &sf->info.si_regs.psr);
129
130 for (i = UREG_G1; i <= UREG_I7; i++)
131 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
132 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
133 err |= __get_user(i, &sf->v8plus.g_upper[0]);
134 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
135 unsigned long asi;
136
137 for (i = UREG_G1; i <= UREG_I7; i++)
138 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
139 err |= __get_user(asi, &sf->v8plus.asi);
140 regs->tstate &= ~TSTATE_ASI;
141 regs->tstate |= ((asi & 0xffUL) << 24UL);
142 }
143 }
144
145 /* User can only change condition codes in %tstate. */
146 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
147 regs->tstate |= psr_to_tstate_icc(psr);
148
149 /* Prevent syscall restart. */
150 pt_regs_clear_syscall(regs);
151
152 err |= __get_user(fpu_save, &sf->fpu_save);
153 if (!err && fpu_save)
154 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
155 err |= __get_user(rwin_save, &sf->rwin_save);
156 if (!err && rwin_save) {
157 if (restore_rwin_state(compat_ptr(rwin_save)))
158 goto segv;
159 }
160 err |= __get_user(seta.sig[0], &sf->info.si_mask);
161 err |= copy_from_user(&seta.sig[1], &sf->extramask,
162 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
163 if (err)
164 goto segv;
165
166 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
167 set_current_blocked(&set);
168 return;
169
170segv:
171 force_sig(SIGSEGV);
172}
173
174asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
175{
176 struct rt_signal_frame32 __user *sf;
177 unsigned int psr, pc, npc, ufp;
178 compat_uptr_t fpu_save;
179 compat_uptr_t rwin_save;
180 sigset_t set;
181 int err, i;
182
183 /* Always make any pending restarted system calls return -EINTR */
184 current->restart_block.fn = do_no_restart_syscall;
185
186 synchronize_user_stack();
187 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
188 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
189
190 /* 1. Make sure we are not getting garbage from the user */
191 if (invalid_frame_pointer(sf, sizeof(*sf)))
192 goto segv;
193
194 if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
195 goto segv;
196
197 if (ufp & 0x7)
198 goto segv;
199
200 if (__get_user(pc, &sf->regs.pc) ||
201 __get_user(npc, &sf->regs.npc))
202 goto segv;
203
204 if ((pc | npc) & 3)
205 goto segv;
206
207 if (test_thread_flag(TIF_32BIT)) {
208 pc &= 0xffffffff;
209 npc &= 0xffffffff;
210 }
211 regs->tpc = pc;
212 regs->tnpc = npc;
213
214 /* 2. Restore the state */
215 err = __get_user(regs->y, &sf->regs.y);
216 err |= __get_user(psr, &sf->regs.psr);
217
218 for (i = UREG_G1; i <= UREG_I7; i++)
219 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
220 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
221 err |= __get_user(i, &sf->v8plus.g_upper[0]);
222 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
223 unsigned long asi;
224
225 for (i = UREG_G1; i <= UREG_I7; i++)
226 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
227 err |= __get_user(asi, &sf->v8plus.asi);
228 regs->tstate &= ~TSTATE_ASI;
229 regs->tstate |= ((asi & 0xffUL) << 24UL);
230 }
231 }
232
233 /* User can only change condition codes in %tstate. */
234 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
235 regs->tstate |= psr_to_tstate_icc(psr);
236
237 /* Prevent syscall restart. */
238 pt_regs_clear_syscall(regs);
239
240 err |= __get_user(fpu_save, &sf->fpu_save);
241 if (!err && fpu_save)
242 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
243 err |= get_compat_sigset(&set, &sf->mask);
244 err |= compat_restore_altstack(&sf->stack);
245 if (err)
246 goto segv;
247
248 err |= __get_user(rwin_save, &sf->rwin_save);
249 if (!err && rwin_save) {
250 if (restore_rwin_state(compat_ptr(rwin_save)))
251 goto segv;
252 }
253
254 set_current_blocked(&set);
255 return;
256segv:
257 force_sig(SIGSEGV);
258}
259
260static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
261{
262 unsigned long sp;
263
264 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
265 sp = regs->u_regs[UREG_FP];
266
267 /*
268 * If we are on the alternate signal stack and would overflow it, don't.
269 * Return an always-bogus address instead so we will die with SIGSEGV.
270 */
271 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
272 return (void __user *) -1L;
273
274 /* This is the X/Open sanctioned signal stack switching. */
275 sp = sigsp(sp, ksig) - framesize;
276
277 /* Always align the stack frame. This handles two cases. First,
278 * sigaltstack need not be mindful of platform specific stack
279 * alignment. Second, if we took this signal because the stack
280 * is not aligned properly, we'd like to take the signal cleanly
281 * and report that.
282 */
283 sp &= ~15UL;
284
285 return (void __user *) sp;
286}
287
288/* The I-cache flush instruction only works in the primary ASI, which
289 * right now is the nucleus, aka. kernel space.
290 *
291 * Therefore we have to kick the instructions out using the kernel
292 * side linear mapping of the physical address backing the user
293 * instructions.
294 */
295static void flush_signal_insns(unsigned long address)
296{
297 unsigned long pstate, paddr;
298 pte_t *ptep, pte;
299 pgd_t *pgdp;
300 p4d_t *p4dp;
301 pud_t *pudp;
302 pmd_t *pmdp;
303
304 /* Commit all stores of the instructions we are about to flush. */
305 wmb();
306
307 /* Disable cross-call reception. In this way even a very wide
308 * munmap() on another cpu can't tear down the page table
309 * hierarchy from underneath us, since that can't complete
310 * until the IPI tlb flush returns.
311 */
312
313 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
314 __asm__ __volatile__("wrpr %0, %1, %%pstate"
315 : : "r" (pstate), "i" (PSTATE_IE));
316
317 pgdp = pgd_offset(current->mm, address);
318 if (pgd_none(*pgdp))
319 goto out_irqs_on;
320 p4dp = p4d_offset(pgdp, address);
321 if (p4d_none(*p4dp))
322 goto out_irqs_on;
323 pudp = pud_offset(p4dp, address);
324 if (pud_none(*pudp))
325 goto out_irqs_on;
326 pmdp = pmd_offset(pudp, address);
327 if (pmd_none(*pmdp))
328 goto out_irqs_on;
329
330 ptep = pte_offset_map(pmdp, address);
331 if (!ptep)
332 goto out_irqs_on;
333 pte = *ptep;
334 if (!pte_present(pte))
335 goto out_unmap;
336
337 paddr = (unsigned long) page_address(pte_page(pte));
338
339 __asm__ __volatile__("flush %0 + %1"
340 : /* no outputs */
341 : "r" (paddr),
342 "r" (address & (PAGE_SIZE - 1))
343 : "memory");
344
345out_unmap:
346 pte_unmap(ptep);
347out_irqs_on:
348 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
349
350}
351
352static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
353 sigset_t *oldset)
354{
355 struct signal_frame32 __user *sf;
356 int i, err, wsaved;
357 void __user *tail;
358 int sigframe_size;
359 u32 psr;
360 compat_sigset_t seta;
361
362 /* 1. Make sure everything is clean */
363 synchronize_user_stack();
364 save_and_clear_fpu();
365
366 wsaved = get_thread_wsaved();
367
368 sigframe_size = sizeof(*sf);
369 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
370 sigframe_size += sizeof(__siginfo_fpu_t);
371 if (wsaved)
372 sigframe_size += sizeof(__siginfo_rwin_t);
373
374 sf = (struct signal_frame32 __user *)
375 get_sigframe(ksig, regs, sigframe_size);
376
377 if (invalid_frame_pointer(sf, sigframe_size)) {
378 if (show_unhandled_signals)
379 pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
380 current->comm, current->pid, (unsigned long)sf,
381 regs->tpc, regs->u_regs[UREG_I7]);
382 force_sigsegv(ksig->sig);
383 return -EINVAL;
384 }
385
386 tail = (sf + 1);
387
388 /* 2. Save the current process state */
389 if (test_thread_flag(TIF_32BIT)) {
390 regs->tpc &= 0xffffffff;
391 regs->tnpc &= 0xffffffff;
392 }
393 err = put_user(regs->tpc, &sf->info.si_regs.pc);
394 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
395 err |= __put_user(regs->y, &sf->info.si_regs.y);
396 psr = tstate_to_psr(regs->tstate);
397 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
398 psr |= PSR_EF;
399 err |= __put_user(psr, &sf->info.si_regs.psr);
400 for (i = 0; i < 16; i++)
401 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
402 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
403 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
404 for (i = 1; i < 16; i++)
405 err |= __put_user(((u32 *)regs->u_regs)[2*i],
406 &sf->v8plus.g_upper[i]);
407 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
408 &sf->v8plus.asi);
409
410 if (psr & PSR_EF) {
411 __siginfo_fpu_t __user *fp = tail;
412 tail += sizeof(*fp);
413 err |= save_fpu_state(regs, fp);
414 err |= __put_user((u64)fp, &sf->fpu_save);
415 } else {
416 err |= __put_user(0, &sf->fpu_save);
417 }
418 if (wsaved) {
419 __siginfo_rwin_t __user *rwp = tail;
420 tail += sizeof(*rwp);
421 err |= save_rwin_state(wsaved, rwp);
422 err |= __put_user((u64)rwp, &sf->rwin_save);
423 set_thread_wsaved(0);
424 } else {
425 err |= __put_user(0, &sf->rwin_save);
426 }
427
428 /* If these change we need to know - assignments to seta relies on these sizes */
429 BUILD_BUG_ON(_NSIG_WORDS != 1);
430 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
431 seta.sig[1] = (oldset->sig[0] >> 32);
432 seta.sig[0] = oldset->sig[0];
433
434 err |= __put_user(seta.sig[0], &sf->info.si_mask);
435 err |= __copy_to_user(sf->extramask, &seta.sig[1],
436 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
437
438 if (!wsaved) {
439 err |= raw_copy_in_user((u32 __user *)sf,
440 (u32 __user *)(regs->u_regs[UREG_FP]),
441 sizeof(struct reg_window32));
442 } else {
443 struct reg_window *rp;
444
445 rp = ¤t_thread_info()->reg_window[wsaved - 1];
446 for (i = 0; i < 8; i++)
447 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
448 for (i = 0; i < 6; i++)
449 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
450 err |= __put_user(rp->ins[6], &sf->ss.fp);
451 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
452 }
453 if (err)
454 return err;
455
456 /* 3. signal handler back-trampoline and parameters */
457 regs->u_regs[UREG_FP] = (unsigned long) sf;
458 regs->u_regs[UREG_I0] = ksig->sig;
459 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
460 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
461
462 /* 4. signal handler */
463 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
464 regs->tnpc = (regs->tpc + 4);
465 if (test_thread_flag(TIF_32BIT)) {
466 regs->tpc &= 0xffffffff;
467 regs->tnpc &= 0xffffffff;
468 }
469
470 /* 5. return to kernel instructions */
471 if (ksig->ka.ka_restorer) {
472 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
473 } else {
474 unsigned long address = ((unsigned long)&(sf->insns[0]));
475
476 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
477
478 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
479 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
480 if (err)
481 return err;
482 flush_signal_insns(address);
483 }
484 return 0;
485}
486
487static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
488 sigset_t *oldset)
489{
490 struct rt_signal_frame32 __user *sf;
491 int i, err, wsaved;
492 void __user *tail;
493 int sigframe_size;
494 u32 psr;
495
496 /* 1. Make sure everything is clean */
497 synchronize_user_stack();
498 save_and_clear_fpu();
499
500 wsaved = get_thread_wsaved();
501
502 sigframe_size = sizeof(*sf);
503 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
504 sigframe_size += sizeof(__siginfo_fpu_t);
505 if (wsaved)
506 sigframe_size += sizeof(__siginfo_rwin_t);
507
508 sf = (struct rt_signal_frame32 __user *)
509 get_sigframe(ksig, regs, sigframe_size);
510
511 if (invalid_frame_pointer(sf, sigframe_size)) {
512 if (show_unhandled_signals)
513 pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
514 current->comm, current->pid, (unsigned long)sf,
515 regs->tpc, regs->u_regs[UREG_I7]);
516 force_sigsegv(ksig->sig);
517 return -EINVAL;
518 }
519
520 tail = (sf + 1);
521
522 /* 2. Save the current process state */
523 if (test_thread_flag(TIF_32BIT)) {
524 regs->tpc &= 0xffffffff;
525 regs->tnpc &= 0xffffffff;
526 }
527 err = put_user(regs->tpc, &sf->regs.pc);
528 err |= __put_user(regs->tnpc, &sf->regs.npc);
529 err |= __put_user(regs->y, &sf->regs.y);
530 psr = tstate_to_psr(regs->tstate);
531 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
532 psr |= PSR_EF;
533 err |= __put_user(psr, &sf->regs.psr);
534 for (i = 0; i < 16; i++)
535 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
536 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
537 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
538 for (i = 1; i < 16; i++)
539 err |= __put_user(((u32 *)regs->u_regs)[2*i],
540 &sf->v8plus.g_upper[i]);
541 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
542 &sf->v8plus.asi);
543
544 if (psr & PSR_EF) {
545 __siginfo_fpu_t __user *fp = tail;
546 tail += sizeof(*fp);
547 err |= save_fpu_state(regs, fp);
548 err |= __put_user((u64)fp, &sf->fpu_save);
549 } else {
550 err |= __put_user(0, &sf->fpu_save);
551 }
552 if (wsaved) {
553 __siginfo_rwin_t __user *rwp = tail;
554 tail += sizeof(*rwp);
555 err |= save_rwin_state(wsaved, rwp);
556 err |= __put_user((u64)rwp, &sf->rwin_save);
557 set_thread_wsaved(0);
558 } else {
559 err |= __put_user(0, &sf->rwin_save);
560 }
561
562 /* Update the siginfo structure. */
563 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
564
565 /* Setup sigaltstack */
566 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
567
568 err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t));
569
570 if (!wsaved) {
571 err |= raw_copy_in_user((u32 __user *)sf,
572 (u32 __user *)(regs->u_regs[UREG_FP]),
573 sizeof(struct reg_window32));
574 } else {
575 struct reg_window *rp;
576
577 rp = ¤t_thread_info()->reg_window[wsaved - 1];
578 for (i = 0; i < 8; i++)
579 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
580 for (i = 0; i < 6; i++)
581 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
582 err |= __put_user(rp->ins[6], &sf->ss.fp);
583 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
584 }
585 if (err)
586 return err;
587
588 /* 3. signal handler back-trampoline and parameters */
589 regs->u_regs[UREG_FP] = (unsigned long) sf;
590 regs->u_regs[UREG_I0] = ksig->sig;
591 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
592 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
593
594 /* 4. signal handler */
595 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
596 regs->tnpc = (regs->tpc + 4);
597 if (test_thread_flag(TIF_32BIT)) {
598 regs->tpc &= 0xffffffff;
599 regs->tnpc &= 0xffffffff;
600 }
601
602 /* 5. return to kernel instructions */
603 if (ksig->ka.ka_restorer)
604 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
605 else {
606 unsigned long address = ((unsigned long)&(sf->insns[0]));
607
608 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
609
610 /* mov __NR_rt_sigreturn, %g1 */
611 err |= __put_user(0x82102065, &sf->insns[0]);
612
613 /* t 0x10 */
614 err |= __put_user(0x91d02010, &sf->insns[1]);
615 if (err)
616 return err;
617
618 flush_signal_insns(address);
619 }
620 return 0;
621}
622
623static inline void handle_signal32(struct ksignal *ksig,
624 struct pt_regs *regs)
625{
626 sigset_t *oldset = sigmask_to_save();
627 int err;
628
629 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
630 err = setup_rt_frame32(ksig, regs, oldset);
631 else
632 err = setup_frame32(ksig, regs, oldset);
633
634 signal_setup_done(err, ksig, 0);
635}
636
637static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
638 struct sigaction *sa)
639{
640 switch (regs->u_regs[UREG_I0]) {
641 case ERESTART_RESTARTBLOCK:
642 case ERESTARTNOHAND:
643 no_system_call_restart:
644 regs->u_regs[UREG_I0] = EINTR;
645 regs->tstate |= TSTATE_ICARRY;
646 break;
647 case ERESTARTSYS:
648 if (!(sa->sa_flags & SA_RESTART))
649 goto no_system_call_restart;
650 fallthrough;
651 case ERESTARTNOINTR:
652 regs->u_regs[UREG_I0] = orig_i0;
653 regs->tpc -= 4;
654 regs->tnpc -= 4;
655 }
656}
657
658/* Note that 'init' is a special process: it doesn't get signals it doesn't
659 * want to handle. Thus you cannot kill init even with a SIGKILL even by
660 * mistake.
661 */
662void do_signal32(struct pt_regs * regs)
663{
664 struct ksignal ksig;
665 unsigned long orig_i0 = 0;
666 int restart_syscall = 0;
667 bool has_handler = get_signal(&ksig);
668
669 if (pt_regs_is_syscall(regs) &&
670 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
671 restart_syscall = 1;
672 orig_i0 = regs->u_regs[UREG_G6];
673 }
674
675 if (has_handler) {
676 if (restart_syscall)
677 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
678 handle_signal32(&ksig, regs);
679 } else {
680 if (restart_syscall) {
681 switch (regs->u_regs[UREG_I0]) {
682 case ERESTARTNOHAND:
683 case ERESTARTSYS:
684 case ERESTARTNOINTR:
685 /* replay the system call when we are done */
686 regs->u_regs[UREG_I0] = orig_i0;
687 regs->tpc -= 4;
688 regs->tnpc -= 4;
689 pt_regs_clear_syscall(regs);
690 fallthrough;
691 case ERESTART_RESTARTBLOCK:
692 regs->u_regs[UREG_G1] = __NR_restart_syscall;
693 regs->tpc -= 4;
694 regs->tnpc -= 4;
695 pt_regs_clear_syscall(regs);
696 }
697 }
698 restore_saved_sigmask();
699 }
700}
701
702struct sigstack32 {
703 u32 the_stack;
704 int cur_status;
705};
706
707asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
708{
709 struct sigstack32 __user *ssptr =
710 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
711 struct sigstack32 __user *ossptr =
712 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
713 int ret = -EFAULT;
714
715 /* First see if old state is wanted. */
716 if (ossptr) {
717 if (put_user(current->sas_ss_sp + current->sas_ss_size,
718 &ossptr->the_stack) ||
719 __put_user(on_sig_stack(sp), &ossptr->cur_status))
720 goto out;
721 }
722
723 /* Now see if we want to update the new state. */
724 if (ssptr) {
725 u32 ss_sp;
726
727 if (get_user(ss_sp, &ssptr->the_stack))
728 goto out;
729
730 /* If the current stack was set with sigaltstack, don't
731 * swap stacks while we are on it.
732 */
733 ret = -EPERM;
734 if (current->sas_ss_sp && on_sig_stack(sp))
735 goto out;
736
737 /* Since we don't know the extent of the stack, and we don't
738 * track onstack-ness, but rather calculate it, we must
739 * presume a size. Ho hum this interface is lossy.
740 */
741 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
742 current->sas_ss_size = SIGSTKSZ;
743 }
744
745 ret = 0;
746out:
747 return ret;
748}
749
750/*
751 * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as
752 * changes likely come with new fields that should be added below.
753 */
754static_assert(NSIGILL == 11);
755static_assert(NSIGFPE == 15);
756static_assert(NSIGSEGV == 10);
757static_assert(NSIGBUS == 5);
758static_assert(NSIGTRAP == 6);
759static_assert(NSIGCHLD == 6);
760static_assert(NSIGSYS == 2);
761static_assert(sizeof(compat_siginfo_t) == 128);
762static_assert(__alignof__(compat_siginfo_t) == 4);
763static_assert(offsetof(compat_siginfo_t, si_signo) == 0x00);
764static_assert(offsetof(compat_siginfo_t, si_errno) == 0x04);
765static_assert(offsetof(compat_siginfo_t, si_code) == 0x08);
766static_assert(offsetof(compat_siginfo_t, si_pid) == 0x0c);
767static_assert(offsetof(compat_siginfo_t, si_uid) == 0x10);
768static_assert(offsetof(compat_siginfo_t, si_tid) == 0x0c);
769static_assert(offsetof(compat_siginfo_t, si_overrun) == 0x10);
770static_assert(offsetof(compat_siginfo_t, si_status) == 0x14);
771static_assert(offsetof(compat_siginfo_t, si_utime) == 0x18);
772static_assert(offsetof(compat_siginfo_t, si_stime) == 0x1c);
773static_assert(offsetof(compat_siginfo_t, si_value) == 0x14);
774static_assert(offsetof(compat_siginfo_t, si_int) == 0x14);
775static_assert(offsetof(compat_siginfo_t, si_ptr) == 0x14);
776static_assert(offsetof(compat_siginfo_t, si_addr) == 0x0c);
777static_assert(offsetof(compat_siginfo_t, si_trapno) == 0x10);
778static_assert(offsetof(compat_siginfo_t, si_addr_lsb) == 0x10);
779static_assert(offsetof(compat_siginfo_t, si_lower) == 0x14);
780static_assert(offsetof(compat_siginfo_t, si_upper) == 0x18);
781static_assert(offsetof(compat_siginfo_t, si_pkey) == 0x14);
782static_assert(offsetof(compat_siginfo_t, si_perf_data) == 0x10);
783static_assert(offsetof(compat_siginfo_t, si_perf_type) == 0x14);
784static_assert(offsetof(compat_siginfo_t, si_perf_flags) == 0x18);
785static_assert(offsetof(compat_siginfo_t, si_band) == 0x0c);
786static_assert(offsetof(compat_siginfo_t, si_fd) == 0x10);