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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// 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);