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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#include "kernel.h"
35
36/* This magic should be in g_upper[0] for all upper parts
37 * to be valid.
38 */
39#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
40typedef struct {
41 unsigned int g_upper[8];
42 unsigned int o_upper[8];
43 unsigned int asi;
44} siginfo_extra_v8plus_t;
45
46struct signal_frame32 {
47 struct sparc_stackf32 ss;
48 __siginfo32_t info;
49 /* __siginfo_fpu_t * */ u32 fpu_save;
50 unsigned int insns[2];
51 unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
52 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
53 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
54 siginfo_extra_v8plus_t v8plus;
55 /* __siginfo_rwin_t * */u32 rwin_save;
56} __attribute__((aligned(8)));
57
58struct rt_signal_frame32 {
59 struct sparc_stackf32 ss;
60 compat_siginfo_t info;
61 struct pt_regs32 regs;
62 compat_sigset_t mask;
63 /* __siginfo_fpu_t * */ u32 fpu_save;
64 unsigned int insns[2];
65 compat_stack_t stack;
66 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
67 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
68 siginfo_extra_v8plus_t v8plus;
69 /* __siginfo_rwin_t * */u32 rwin_save;
70} __attribute__((aligned(8)));
71
72int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
73{
74 int err;
75
76 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
77 return -EFAULT;
78
79 /* If you change siginfo_t structure, please be sure
80 this code is fixed accordingly.
81 It should never copy any pad contained in the structure
82 to avoid security leaks, but must copy the generic
83 3 ints plus the relevant union member.
84 This routine must convert siginfo from 64bit to 32bit as well
85 at the same time. */
86 err = __put_user(from->si_signo, &to->si_signo);
87 err |= __put_user(from->si_errno, &to->si_errno);
88 err |= __put_user((short)from->si_code, &to->si_code);
89 if (from->si_code < 0)
90 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
91 else {
92 switch (from->si_code >> 16) {
93 case __SI_TIMER >> 16:
94 err |= __put_user(from->si_tid, &to->si_tid);
95 err |= __put_user(from->si_overrun, &to->si_overrun);
96 err |= __put_user(from->si_int, &to->si_int);
97 break;
98 case __SI_CHLD >> 16:
99 err |= __put_user(from->si_utime, &to->si_utime);
100 err |= __put_user(from->si_stime, &to->si_stime);
101 err |= __put_user(from->si_status, &to->si_status);
102 default:
103 err |= __put_user(from->si_pid, &to->si_pid);
104 err |= __put_user(from->si_uid, &to->si_uid);
105 break;
106 case __SI_FAULT >> 16:
107 err |= __put_user(from->si_trapno, &to->si_trapno);
108 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
109 break;
110 case __SI_POLL >> 16:
111 err |= __put_user(from->si_band, &to->si_band);
112 err |= __put_user(from->si_fd, &to->si_fd);
113 break;
114 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
115 case __SI_MESGQ >> 16:
116 err |= __put_user(from->si_pid, &to->si_pid);
117 err |= __put_user(from->si_uid, &to->si_uid);
118 err |= __put_user(from->si_int, &to->si_int);
119 break;
120 }
121 }
122 return err;
123}
124
125/* CAUTION: This is just a very minimalist implementation for the
126 * sake of compat_sys_rt_sigqueueinfo()
127 */
128int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
129{
130 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
131 return -EFAULT;
132
133 if (copy_from_user(to, from, 3*sizeof(int)) ||
134 copy_from_user(to->_sifields._pad, from->_sifields._pad,
135 SI_PAD_SIZE))
136 return -EFAULT;
137
138 return 0;
139}
140
141void do_sigreturn32(struct pt_regs *regs)
142{
143 struct signal_frame32 __user *sf;
144 compat_uptr_t fpu_save;
145 compat_uptr_t rwin_save;
146 unsigned int psr;
147 unsigned int pc, npc;
148 sigset_t set;
149 compat_sigset_t seta;
150 int err, i;
151
152 /* Always make any pending restarted system calls return -EINTR */
153 current->restart_block.fn = do_no_restart_syscall;
154
155 synchronize_user_stack();
156
157 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
158 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
159
160 /* 1. Make sure we are not getting garbage from the user */
161 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
162 (((unsigned long) sf) & 3))
163 goto segv;
164
165 if (get_user(pc, &sf->info.si_regs.pc) ||
166 __get_user(npc, &sf->info.si_regs.npc))
167 goto segv;
168
169 if ((pc | npc) & 3)
170 goto segv;
171
172 if (test_thread_flag(TIF_32BIT)) {
173 pc &= 0xffffffff;
174 npc &= 0xffffffff;
175 }
176 regs->tpc = pc;
177 regs->tnpc = npc;
178
179 /* 2. Restore the state */
180 err = __get_user(regs->y, &sf->info.si_regs.y);
181 err |= __get_user(psr, &sf->info.si_regs.psr);
182
183 for (i = UREG_G1; i <= UREG_I7; i++)
184 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
185 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
186 err |= __get_user(i, &sf->v8plus.g_upper[0]);
187 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
188 unsigned long asi;
189
190 for (i = UREG_G1; i <= UREG_I7; i++)
191 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
192 err |= __get_user(asi, &sf->v8plus.asi);
193 regs->tstate &= ~TSTATE_ASI;
194 regs->tstate |= ((asi & 0xffUL) << 24UL);
195 }
196 }
197
198 /* User can only change condition codes in %tstate. */
199 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
200 regs->tstate |= psr_to_tstate_icc(psr);
201
202 /* Prevent syscall restart. */
203 pt_regs_clear_syscall(regs);
204
205 err |= __get_user(fpu_save, &sf->fpu_save);
206 if (!err && fpu_save)
207 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
208 err |= __get_user(rwin_save, &sf->rwin_save);
209 if (!err && rwin_save) {
210 if (restore_rwin_state(compat_ptr(rwin_save)))
211 goto segv;
212 }
213 err |= __get_user(seta.sig[0], &sf->info.si_mask);
214 err |= copy_from_user(&seta.sig[1], &sf->extramask,
215 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
216 if (err)
217 goto segv;
218
219 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
220 set_current_blocked(&set);
221 return;
222
223segv:
224 force_sig(SIGSEGV, current);
225}
226
227asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
228{
229 struct rt_signal_frame32 __user *sf;
230 unsigned int psr, pc, npc;
231 compat_uptr_t fpu_save;
232 compat_uptr_t rwin_save;
233 sigset_t set;
234 compat_sigset_t seta;
235 int err, i;
236
237 /* Always make any pending restarted system calls return -EINTR */
238 current->restart_block.fn = do_no_restart_syscall;
239
240 synchronize_user_stack();
241 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
242 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
243
244 /* 1. Make sure we are not getting garbage from the user */
245 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
246 (((unsigned long) sf) & 3))
247 goto segv;
248
249 if (get_user(pc, &sf->regs.pc) ||
250 __get_user(npc, &sf->regs.npc))
251 goto segv;
252
253 if ((pc | npc) & 3)
254 goto segv;
255
256 if (test_thread_flag(TIF_32BIT)) {
257 pc &= 0xffffffff;
258 npc &= 0xffffffff;
259 }
260 regs->tpc = pc;
261 regs->tnpc = npc;
262
263 /* 2. Restore the state */
264 err = __get_user(regs->y, &sf->regs.y);
265 err |= __get_user(psr, &sf->regs.psr);
266
267 for (i = UREG_G1; i <= UREG_I7; i++)
268 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
269 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
270 err |= __get_user(i, &sf->v8plus.g_upper[0]);
271 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
272 unsigned long asi;
273
274 for (i = UREG_G1; i <= UREG_I7; i++)
275 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
276 err |= __get_user(asi, &sf->v8plus.asi);
277 regs->tstate &= ~TSTATE_ASI;
278 regs->tstate |= ((asi & 0xffUL) << 24UL);
279 }
280 }
281
282 /* User can only change condition codes in %tstate. */
283 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
284 regs->tstate |= psr_to_tstate_icc(psr);
285
286 /* Prevent syscall restart. */
287 pt_regs_clear_syscall(regs);
288
289 err |= __get_user(fpu_save, &sf->fpu_save);
290 if (!err && fpu_save)
291 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
292 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
293 err |= compat_restore_altstack(&sf->stack);
294 if (err)
295 goto segv;
296
297 err |= __get_user(rwin_save, &sf->rwin_save);
298 if (!err && rwin_save) {
299 if (restore_rwin_state(compat_ptr(rwin_save)))
300 goto segv;
301 }
302
303 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
304 set_current_blocked(&set);
305 return;
306segv:
307 force_sig(SIGSEGV, current);
308}
309
310/* Checks if the fp is valid */
311static int invalid_frame_pointer(void __user *fp, int fplen)
312{
313 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
314 return 1;
315 return 0;
316}
317
318static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
319{
320 unsigned long sp;
321
322 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
323 sp = regs->u_regs[UREG_FP];
324
325 /*
326 * If we are on the alternate signal stack and would overflow it, don't.
327 * Return an always-bogus address instead so we will die with SIGSEGV.
328 */
329 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
330 return (void __user *) -1L;
331
332 /* This is the X/Open sanctioned signal stack switching. */
333 sp = sigsp(sp, ksig) - framesize;
334
335 /* Always align the stack frame. This handles two cases. First,
336 * sigaltstack need not be mindful of platform specific stack
337 * alignment. Second, if we took this signal because the stack
338 * is not aligned properly, we'd like to take the signal cleanly
339 * and report that.
340 */
341 sp &= ~15UL;
342
343 return (void __user *) sp;
344}
345
346/* The I-cache flush instruction only works in the primary ASI, which
347 * right now is the nucleus, aka. kernel space.
348 *
349 * Therefore we have to kick the instructions out using the kernel
350 * side linear mapping of the physical address backing the user
351 * instructions.
352 */
353static void flush_signal_insns(unsigned long address)
354{
355 unsigned long pstate, paddr;
356 pte_t *ptep, pte;
357 pgd_t *pgdp;
358 pud_t *pudp;
359 pmd_t *pmdp;
360
361 /* Commit all stores of the instructions we are about to flush. */
362 wmb();
363
364 /* Disable cross-call reception. In this way even a very wide
365 * munmap() on another cpu can't tear down the page table
366 * hierarchy from underneath us, since that can't complete
367 * until the IPI tlb flush returns.
368 */
369
370 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
371 __asm__ __volatile__("wrpr %0, %1, %%pstate"
372 : : "r" (pstate), "i" (PSTATE_IE));
373
374 pgdp = pgd_offset(current->mm, address);
375 if (pgd_none(*pgdp))
376 goto out_irqs_on;
377 pudp = pud_offset(pgdp, address);
378 if (pud_none(*pudp))
379 goto out_irqs_on;
380 pmdp = pmd_offset(pudp, address);
381 if (pmd_none(*pmdp))
382 goto out_irqs_on;
383
384 ptep = pte_offset_map(pmdp, address);
385 pte = *ptep;
386 if (!pte_present(pte))
387 goto out_unmap;
388
389 paddr = (unsigned long) page_address(pte_page(pte));
390
391 __asm__ __volatile__("flush %0 + %1"
392 : /* no outputs */
393 : "r" (paddr),
394 "r" (address & (PAGE_SIZE - 1))
395 : "memory");
396
397out_unmap:
398 pte_unmap(ptep);
399out_irqs_on:
400 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
401
402}
403
404static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
405 sigset_t *oldset)
406{
407 struct signal_frame32 __user *sf;
408 int i, err, wsaved;
409 void __user *tail;
410 int sigframe_size;
411 u32 psr;
412 compat_sigset_t seta;
413
414 /* 1. Make sure everything is clean */
415 synchronize_user_stack();
416 save_and_clear_fpu();
417
418 wsaved = get_thread_wsaved();
419
420 sigframe_size = sizeof(*sf);
421 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
422 sigframe_size += sizeof(__siginfo_fpu_t);
423 if (wsaved)
424 sigframe_size += sizeof(__siginfo_rwin_t);
425
426 sf = (struct signal_frame32 __user *)
427 get_sigframe(ksig, regs, sigframe_size);
428
429 if (invalid_frame_pointer(sf, sigframe_size)) {
430 do_exit(SIGILL);
431 return -EINVAL;
432 }
433
434 tail = (sf + 1);
435
436 /* 2. Save the current process state */
437 if (test_thread_flag(TIF_32BIT)) {
438 regs->tpc &= 0xffffffff;
439 regs->tnpc &= 0xffffffff;
440 }
441 err = put_user(regs->tpc, &sf->info.si_regs.pc);
442 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
443 err |= __put_user(regs->y, &sf->info.si_regs.y);
444 psr = tstate_to_psr(regs->tstate);
445 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
446 psr |= PSR_EF;
447 err |= __put_user(psr, &sf->info.si_regs.psr);
448 for (i = 0; i < 16; i++)
449 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
450 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
451 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
452 for (i = 1; i < 16; i++)
453 err |= __put_user(((u32 *)regs->u_regs)[2*i],
454 &sf->v8plus.g_upper[i]);
455 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
456 &sf->v8plus.asi);
457
458 if (psr & PSR_EF) {
459 __siginfo_fpu_t __user *fp = tail;
460 tail += sizeof(*fp);
461 err |= save_fpu_state(regs, fp);
462 err |= __put_user((u64)fp, &sf->fpu_save);
463 } else {
464 err |= __put_user(0, &sf->fpu_save);
465 }
466 if (wsaved) {
467 __siginfo_rwin_t __user *rwp = tail;
468 tail += sizeof(*rwp);
469 err |= save_rwin_state(wsaved, rwp);
470 err |= __put_user((u64)rwp, &sf->rwin_save);
471 set_thread_wsaved(0);
472 } else {
473 err |= __put_user(0, &sf->rwin_save);
474 }
475
476 /* If these change we need to know - assignments to seta relies on these sizes */
477 BUILD_BUG_ON(_NSIG_WORDS != 1);
478 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
479 seta.sig[1] = (oldset->sig[0] >> 32);
480 seta.sig[0] = oldset->sig[0];
481
482 err |= __put_user(seta.sig[0], &sf->info.si_mask);
483 err |= __copy_to_user(sf->extramask, &seta.sig[1],
484 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
485
486 if (!wsaved) {
487 err |= copy_in_user((u32 __user *)sf,
488 (u32 __user *)(regs->u_regs[UREG_FP]),
489 sizeof(struct reg_window32));
490 } else {
491 struct reg_window *rp;
492
493 rp = ¤t_thread_info()->reg_window[wsaved - 1];
494 for (i = 0; i < 8; i++)
495 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
496 for (i = 0; i < 6; i++)
497 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
498 err |= __put_user(rp->ins[6], &sf->ss.fp);
499 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
500 }
501 if (err)
502 return err;
503
504 /* 3. signal handler back-trampoline and parameters */
505 regs->u_regs[UREG_FP] = (unsigned long) sf;
506 regs->u_regs[UREG_I0] = ksig->sig;
507 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
508 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
509
510 /* 4. signal handler */
511 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
512 regs->tnpc = (regs->tpc + 4);
513 if (test_thread_flag(TIF_32BIT)) {
514 regs->tpc &= 0xffffffff;
515 regs->tnpc &= 0xffffffff;
516 }
517
518 /* 5. return to kernel instructions */
519 if (ksig->ka.ka_restorer) {
520 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
521 } else {
522 unsigned long address = ((unsigned long)&(sf->insns[0]));
523
524 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
525
526 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
527 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
528 if (err)
529 return err;
530 flush_signal_insns(address);
531 }
532 return 0;
533}
534
535static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
536 sigset_t *oldset)
537{
538 struct rt_signal_frame32 __user *sf;
539 int i, err, wsaved;
540 void __user *tail;
541 int sigframe_size;
542 u32 psr;
543 compat_sigset_t seta;
544
545 /* 1. Make sure everything is clean */
546 synchronize_user_stack();
547 save_and_clear_fpu();
548
549 wsaved = get_thread_wsaved();
550
551 sigframe_size = sizeof(*sf);
552 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
553 sigframe_size += sizeof(__siginfo_fpu_t);
554 if (wsaved)
555 sigframe_size += sizeof(__siginfo_rwin_t);
556
557 sf = (struct rt_signal_frame32 __user *)
558 get_sigframe(ksig, regs, sigframe_size);
559
560 if (invalid_frame_pointer(sf, sigframe_size)) {
561 do_exit(SIGILL);
562 return -EINVAL;
563 }
564
565 tail = (sf + 1);
566
567 /* 2. Save the current process state */
568 if (test_thread_flag(TIF_32BIT)) {
569 regs->tpc &= 0xffffffff;
570 regs->tnpc &= 0xffffffff;
571 }
572 err = put_user(regs->tpc, &sf->regs.pc);
573 err |= __put_user(regs->tnpc, &sf->regs.npc);
574 err |= __put_user(regs->y, &sf->regs.y);
575 psr = tstate_to_psr(regs->tstate);
576 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
577 psr |= PSR_EF;
578 err |= __put_user(psr, &sf->regs.psr);
579 for (i = 0; i < 16; i++)
580 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
581 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
582 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
583 for (i = 1; i < 16; i++)
584 err |= __put_user(((u32 *)regs->u_regs)[2*i],
585 &sf->v8plus.g_upper[i]);
586 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
587 &sf->v8plus.asi);
588
589 if (psr & PSR_EF) {
590 __siginfo_fpu_t __user *fp = tail;
591 tail += sizeof(*fp);
592 err |= save_fpu_state(regs, fp);
593 err |= __put_user((u64)fp, &sf->fpu_save);
594 } else {
595 err |= __put_user(0, &sf->fpu_save);
596 }
597 if (wsaved) {
598 __siginfo_rwin_t __user *rwp = tail;
599 tail += sizeof(*rwp);
600 err |= save_rwin_state(wsaved, rwp);
601 err |= __put_user((u64)rwp, &sf->rwin_save);
602 set_thread_wsaved(0);
603 } else {
604 err |= __put_user(0, &sf->rwin_save);
605 }
606
607 /* Update the siginfo structure. */
608 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
609
610 /* Setup sigaltstack */
611 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
612
613 seta.sig[1] = (oldset->sig[0] >> 32);
614 seta.sig[0] = oldset->sig[0];
615 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
616
617 if (!wsaved) {
618 err |= copy_in_user((u32 __user *)sf,
619 (u32 __user *)(regs->u_regs[UREG_FP]),
620 sizeof(struct reg_window32));
621 } else {
622 struct reg_window *rp;
623
624 rp = ¤t_thread_info()->reg_window[wsaved - 1];
625 for (i = 0; i < 8; i++)
626 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
627 for (i = 0; i < 6; i++)
628 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
629 err |= __put_user(rp->ins[6], &sf->ss.fp);
630 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
631 }
632 if (err)
633 return err;
634
635 /* 3. signal handler back-trampoline and parameters */
636 regs->u_regs[UREG_FP] = (unsigned long) sf;
637 regs->u_regs[UREG_I0] = ksig->sig;
638 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
639 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
640
641 /* 4. signal handler */
642 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
643 regs->tnpc = (regs->tpc + 4);
644 if (test_thread_flag(TIF_32BIT)) {
645 regs->tpc &= 0xffffffff;
646 regs->tnpc &= 0xffffffff;
647 }
648
649 /* 5. return to kernel instructions */
650 if (ksig->ka.ka_restorer)
651 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
652 else {
653 unsigned long address = ((unsigned long)&(sf->insns[0]));
654
655 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
656
657 /* mov __NR_rt_sigreturn, %g1 */
658 err |= __put_user(0x82102065, &sf->insns[0]);
659
660 /* t 0x10 */
661 err |= __put_user(0x91d02010, &sf->insns[1]);
662 if (err)
663 return err;
664
665 flush_signal_insns(address);
666 }
667 return 0;
668}
669
670static inline void handle_signal32(struct ksignal *ksig,
671 struct pt_regs *regs)
672{
673 sigset_t *oldset = sigmask_to_save();
674 int err;
675
676 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
677 err = setup_rt_frame32(ksig, regs, oldset);
678 else
679 err = setup_frame32(ksig, regs, oldset);
680
681 signal_setup_done(err, ksig, 0);
682}
683
684static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
685 struct sigaction *sa)
686{
687 switch (regs->u_regs[UREG_I0]) {
688 case ERESTART_RESTARTBLOCK:
689 case ERESTARTNOHAND:
690 no_system_call_restart:
691 regs->u_regs[UREG_I0] = EINTR;
692 regs->tstate |= TSTATE_ICARRY;
693 break;
694 case ERESTARTSYS:
695 if (!(sa->sa_flags & SA_RESTART))
696 goto no_system_call_restart;
697 /* fallthrough */
698 case ERESTARTNOINTR:
699 regs->u_regs[UREG_I0] = orig_i0;
700 regs->tpc -= 4;
701 regs->tnpc -= 4;
702 }
703}
704
705/* Note that 'init' is a special process: it doesn't get signals it doesn't
706 * want to handle. Thus you cannot kill init even with a SIGKILL even by
707 * mistake.
708 */
709void do_signal32(struct pt_regs * regs)
710{
711 struct ksignal ksig;
712 unsigned long orig_i0 = 0;
713 int restart_syscall = 0;
714 bool has_handler = get_signal(&ksig);
715
716 if (pt_regs_is_syscall(regs) &&
717 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
718 restart_syscall = 1;
719 orig_i0 = regs->u_regs[UREG_G6];
720 }
721
722 if (has_handler) {
723 if (restart_syscall)
724 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
725 handle_signal32(&ksig, regs);
726 } else {
727 if (restart_syscall) {
728 switch (regs->u_regs[UREG_I0]) {
729 case ERESTARTNOHAND:
730 case ERESTARTSYS:
731 case ERESTARTNOINTR:
732 /* replay the system call when we are done */
733 regs->u_regs[UREG_I0] = orig_i0;
734 regs->tpc -= 4;
735 regs->tnpc -= 4;
736 pt_regs_clear_syscall(regs);
737 case ERESTART_RESTARTBLOCK:
738 regs->u_regs[UREG_G1] = __NR_restart_syscall;
739 regs->tpc -= 4;
740 regs->tnpc -= 4;
741 pt_regs_clear_syscall(regs);
742 }
743 }
744 restore_saved_sigmask();
745 }
746}
747
748struct sigstack32 {
749 u32 the_stack;
750 int cur_status;
751};
752
753asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
754{
755 struct sigstack32 __user *ssptr =
756 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
757 struct sigstack32 __user *ossptr =
758 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
759 int ret = -EFAULT;
760
761 /* First see if old state is wanted. */
762 if (ossptr) {
763 if (put_user(current->sas_ss_sp + current->sas_ss_size,
764 &ossptr->the_stack) ||
765 __put_user(on_sig_stack(sp), &ossptr->cur_status))
766 goto out;
767 }
768
769 /* Now see if we want to update the new state. */
770 if (ssptr) {
771 u32 ss_sp;
772
773 if (get_user(ss_sp, &ssptr->the_stack))
774 goto out;
775
776 /* If the current stack was set with sigaltstack, don't
777 * swap stacks while we are on it.
778 */
779 ret = -EPERM;
780 if (current->sas_ss_sp && on_sig_stack(sp))
781 goto out;
782
783 /* Since we don't know the extent of the stack, and we don't
784 * track onstack-ness, but rather calculate it, we must
785 * presume a size. Ho hum this interface is lossy.
786 */
787 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
788 current->sas_ss_size = SIGSTKSZ;
789 }
790
791 ret = 0;
792out:
793 return ret;
794}
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);