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1/* arch/sparc64/kernel/signal32.c
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
6 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 */
9
10#include <linux/sched.h>
11#include <linux/kernel.h>
12#include <linux/signal.h>
13#include <linux/errno.h>
14#include <linux/wait.h>
15#include <linux/ptrace.h>
16#include <linux/unistd.h>
17#include <linux/mm.h>
18#include <linux/tty.h>
19#include <linux/binfmts.h>
20#include <linux/compat.h>
21#include <linux/bitops.h>
22#include <linux/tracehook.h>
23
24#include <asm/uaccess.h>
25#include <asm/ptrace.h>
26#include <asm/pgtable.h>
27#include <asm/psrcompat.h>
28#include <asm/fpumacro.h>
29#include <asm/visasm.h>
30#include <asm/compat_signal.h>
31#include <asm/switch_to.h>
32
33#include "sigutil.h"
34
35/* This magic should be in g_upper[0] for all upper parts
36 * to be valid.
37 */
38#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
39typedef struct {
40 unsigned int g_upper[8];
41 unsigned int o_upper[8];
42 unsigned int asi;
43} siginfo_extra_v8plus_t;
44
45struct signal_frame32 {
46 struct sparc_stackf32 ss;
47 __siginfo32_t info;
48 /* __siginfo_fpu_t * */ u32 fpu_save;
49 unsigned int insns[2];
50 unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
51 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
52 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
53 siginfo_extra_v8plus_t v8plus;
54 /* __siginfo_rwin_t * */u32 rwin_save;
55} __attribute__((aligned(8)));
56
57typedef struct compat_siginfo{
58 int si_signo;
59 int si_errno;
60 int si_code;
61
62 union {
63 int _pad[SI_PAD_SIZE32];
64
65 /* kill() */
66 struct {
67 compat_pid_t _pid; /* sender's pid */
68 unsigned int _uid; /* sender's uid */
69 } _kill;
70
71 /* POSIX.1b timers */
72 struct {
73 compat_timer_t _tid; /* timer id */
74 int _overrun; /* overrun count */
75 compat_sigval_t _sigval; /* same as below */
76 int _sys_private; /* not to be passed to user */
77 } _timer;
78
79 /* POSIX.1b signals */
80 struct {
81 compat_pid_t _pid; /* sender's pid */
82 unsigned int _uid; /* sender's uid */
83 compat_sigval_t _sigval;
84 } _rt;
85
86 /* SIGCHLD */
87 struct {
88 compat_pid_t _pid; /* which child */
89 unsigned int _uid; /* sender's uid */
90 int _status; /* exit code */
91 compat_clock_t _utime;
92 compat_clock_t _stime;
93 } _sigchld;
94
95 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */
96 struct {
97 u32 _addr; /* faulting insn/memory ref. */
98 int _trapno;
99 } _sigfault;
100
101 /* SIGPOLL */
102 struct {
103 int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
104 int _fd;
105 } _sigpoll;
106 } _sifields;
107}compat_siginfo_t;
108
109struct rt_signal_frame32 {
110 struct sparc_stackf32 ss;
111 compat_siginfo_t info;
112 struct pt_regs32 regs;
113 compat_sigset_t mask;
114 /* __siginfo_fpu_t * */ u32 fpu_save;
115 unsigned int insns[2];
116 stack_t32 stack;
117 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
118 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
119 siginfo_extra_v8plus_t v8plus;
120 /* __siginfo_rwin_t * */u32 rwin_save;
121} __attribute__((aligned(8)));
122
123int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
124{
125 int err;
126
127 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
128 return -EFAULT;
129
130 /* If you change siginfo_t structure, please be sure
131 this code is fixed accordingly.
132 It should never copy any pad contained in the structure
133 to avoid security leaks, but must copy the generic
134 3 ints plus the relevant union member.
135 This routine must convert siginfo from 64bit to 32bit as well
136 at the same time. */
137 err = __put_user(from->si_signo, &to->si_signo);
138 err |= __put_user(from->si_errno, &to->si_errno);
139 err |= __put_user((short)from->si_code, &to->si_code);
140 if (from->si_code < 0)
141 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
142 else {
143 switch (from->si_code >> 16) {
144 case __SI_TIMER >> 16:
145 err |= __put_user(from->si_tid, &to->si_tid);
146 err |= __put_user(from->si_overrun, &to->si_overrun);
147 err |= __put_user(from->si_int, &to->si_int);
148 break;
149 case __SI_CHLD >> 16:
150 err |= __put_user(from->si_utime, &to->si_utime);
151 err |= __put_user(from->si_stime, &to->si_stime);
152 err |= __put_user(from->si_status, &to->si_status);
153 default:
154 err |= __put_user(from->si_pid, &to->si_pid);
155 err |= __put_user(from->si_uid, &to->si_uid);
156 break;
157 case __SI_FAULT >> 16:
158 err |= __put_user(from->si_trapno, &to->si_trapno);
159 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
160 break;
161 case __SI_POLL >> 16:
162 err |= __put_user(from->si_band, &to->si_band);
163 err |= __put_user(from->si_fd, &to->si_fd);
164 break;
165 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
166 case __SI_MESGQ >> 16:
167 err |= __put_user(from->si_pid, &to->si_pid);
168 err |= __put_user(from->si_uid, &to->si_uid);
169 err |= __put_user(from->si_int, &to->si_int);
170 break;
171 }
172 }
173 return err;
174}
175
176/* CAUTION: This is just a very minimalist implementation for the
177 * sake of compat_sys_rt_sigqueueinfo()
178 */
179int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
180{
181 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
182 return -EFAULT;
183
184 if (copy_from_user(to, from, 3*sizeof(int)) ||
185 copy_from_user(to->_sifields._pad, from->_sifields._pad,
186 SI_PAD_SIZE))
187 return -EFAULT;
188
189 return 0;
190}
191
192void do_sigreturn32(struct pt_regs *regs)
193{
194 struct signal_frame32 __user *sf;
195 compat_uptr_t fpu_save;
196 compat_uptr_t rwin_save;
197 unsigned int psr;
198 unsigned pc, npc;
199 sigset_t set;
200 unsigned seta[_COMPAT_NSIG_WORDS];
201 int err, i;
202
203 /* Always make any pending restarted system calls return -EINTR */
204 current_thread_info()->restart_block.fn = do_no_restart_syscall;
205
206 synchronize_user_stack();
207
208 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
209 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
210
211 /* 1. Make sure we are not getting garbage from the user */
212 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
213 (((unsigned long) sf) & 3))
214 goto segv;
215
216 if (get_user(pc, &sf->info.si_regs.pc) ||
217 __get_user(npc, &sf->info.si_regs.npc))
218 goto segv;
219
220 if ((pc | npc) & 3)
221 goto segv;
222
223 if (test_thread_flag(TIF_32BIT)) {
224 pc &= 0xffffffff;
225 npc &= 0xffffffff;
226 }
227 regs->tpc = pc;
228 regs->tnpc = npc;
229
230 /* 2. Restore the state */
231 err = __get_user(regs->y, &sf->info.si_regs.y);
232 err |= __get_user(psr, &sf->info.si_regs.psr);
233
234 for (i = UREG_G1; i <= UREG_I7; i++)
235 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
236 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
237 err |= __get_user(i, &sf->v8plus.g_upper[0]);
238 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
239 unsigned long asi;
240
241 for (i = UREG_G1; i <= UREG_I7; i++)
242 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
243 err |= __get_user(asi, &sf->v8plus.asi);
244 regs->tstate &= ~TSTATE_ASI;
245 regs->tstate |= ((asi & 0xffUL) << 24UL);
246 }
247 }
248
249 /* User can only change condition codes in %tstate. */
250 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
251 regs->tstate |= psr_to_tstate_icc(psr);
252
253 /* Prevent syscall restart. */
254 pt_regs_clear_syscall(regs);
255
256 err |= __get_user(fpu_save, &sf->fpu_save);
257 if (!err && fpu_save)
258 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
259 err |= __get_user(rwin_save, &sf->rwin_save);
260 if (!err && rwin_save) {
261 if (restore_rwin_state(compat_ptr(rwin_save)))
262 goto segv;
263 }
264 err |= __get_user(seta[0], &sf->info.si_mask);
265 err |= copy_from_user(seta+1, &sf->extramask,
266 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
267 if (err)
268 goto segv;
269 switch (_NSIG_WORDS) {
270 case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
271 case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
272 case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
273 case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
274 }
275 set_current_blocked(&set);
276 return;
277
278segv:
279 force_sig(SIGSEGV, current);
280}
281
282asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
283{
284 struct rt_signal_frame32 __user *sf;
285 unsigned int psr, pc, npc, u_ss_sp;
286 compat_uptr_t fpu_save;
287 compat_uptr_t rwin_save;
288 mm_segment_t old_fs;
289 sigset_t set;
290 compat_sigset_t seta;
291 stack_t st;
292 int err, i;
293
294 /* Always make any pending restarted system calls return -EINTR */
295 current_thread_info()->restart_block.fn = do_no_restart_syscall;
296
297 synchronize_user_stack();
298 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
299 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
300
301 /* 1. Make sure we are not getting garbage from the user */
302 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
303 (((unsigned long) sf) & 3))
304 goto segv;
305
306 if (get_user(pc, &sf->regs.pc) ||
307 __get_user(npc, &sf->regs.npc))
308 goto segv;
309
310 if ((pc | npc) & 3)
311 goto segv;
312
313 if (test_thread_flag(TIF_32BIT)) {
314 pc &= 0xffffffff;
315 npc &= 0xffffffff;
316 }
317 regs->tpc = pc;
318 regs->tnpc = npc;
319
320 /* 2. Restore the state */
321 err = __get_user(regs->y, &sf->regs.y);
322 err |= __get_user(psr, &sf->regs.psr);
323
324 for (i = UREG_G1; i <= UREG_I7; i++)
325 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
326 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
327 err |= __get_user(i, &sf->v8plus.g_upper[0]);
328 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
329 unsigned long asi;
330
331 for (i = UREG_G1; i <= UREG_I7; i++)
332 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
333 err |= __get_user(asi, &sf->v8plus.asi);
334 regs->tstate &= ~TSTATE_ASI;
335 regs->tstate |= ((asi & 0xffUL) << 24UL);
336 }
337 }
338
339 /* User can only change condition codes in %tstate. */
340 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
341 regs->tstate |= psr_to_tstate_icc(psr);
342
343 /* Prevent syscall restart. */
344 pt_regs_clear_syscall(regs);
345
346 err |= __get_user(fpu_save, &sf->fpu_save);
347 if (!err && fpu_save)
348 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
349 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
350 err |= __get_user(u_ss_sp, &sf->stack.ss_sp);
351 st.ss_sp = compat_ptr(u_ss_sp);
352 err |= __get_user(st.ss_flags, &sf->stack.ss_flags);
353 err |= __get_user(st.ss_size, &sf->stack.ss_size);
354 if (err)
355 goto segv;
356
357 /* It is more difficult to avoid calling this function than to
358 call it and ignore errors. */
359 old_fs = get_fs();
360 set_fs(KERNEL_DS);
361 do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf);
362 set_fs(old_fs);
363
364 err |= __get_user(rwin_save, &sf->rwin_save);
365 if (!err && rwin_save) {
366 if (restore_rwin_state(compat_ptr(rwin_save)))
367 goto segv;
368 }
369
370 switch (_NSIG_WORDS) {
371 case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32);
372 case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32);
373 case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32);
374 case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
375 }
376 set_current_blocked(&set);
377 return;
378segv:
379 force_sig(SIGSEGV, current);
380}
381
382/* Checks if the fp is valid */
383static int invalid_frame_pointer(void __user *fp, int fplen)
384{
385 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
386 return 1;
387 return 0;
388}
389
390static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
391{
392 unsigned long sp;
393
394 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
395 sp = regs->u_regs[UREG_FP];
396
397 /*
398 * If we are on the alternate signal stack and would overflow it, don't.
399 * Return an always-bogus address instead so we will die with SIGSEGV.
400 */
401 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
402 return (void __user *) -1L;
403
404 /* This is the X/Open sanctioned signal stack switching. */
405 if (sa->sa_flags & SA_ONSTACK) {
406 if (sas_ss_flags(sp) == 0)
407 sp = current->sas_ss_sp + current->sas_ss_size;
408 }
409
410 sp -= framesize;
411
412 /* Always align the stack frame. This handles two cases. First,
413 * sigaltstack need not be mindful of platform specific stack
414 * alignment. Second, if we took this signal because the stack
415 * is not aligned properly, we'd like to take the signal cleanly
416 * and report that.
417 */
418 sp &= ~15UL;
419
420 return (void __user *) sp;
421}
422
423/* The I-cache flush instruction only works in the primary ASI, which
424 * right now is the nucleus, aka. kernel space.
425 *
426 * Therefore we have to kick the instructions out using the kernel
427 * side linear mapping of the physical address backing the user
428 * instructions.
429 */
430static void flush_signal_insns(unsigned long address)
431{
432 unsigned long pstate, paddr;
433 pte_t *ptep, pte;
434 pgd_t *pgdp;
435 pud_t *pudp;
436 pmd_t *pmdp;
437
438 /* Commit all stores of the instructions we are about to flush. */
439 wmb();
440
441 /* Disable cross-call reception. In this way even a very wide
442 * munmap() on another cpu can't tear down the page table
443 * hierarchy from underneath us, since that can't complete
444 * until the IPI tlb flush returns.
445 */
446
447 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
448 __asm__ __volatile__("wrpr %0, %1, %%pstate"
449 : : "r" (pstate), "i" (PSTATE_IE));
450
451 pgdp = pgd_offset(current->mm, address);
452 if (pgd_none(*pgdp))
453 goto out_irqs_on;
454 pudp = pud_offset(pgdp, address);
455 if (pud_none(*pudp))
456 goto out_irqs_on;
457 pmdp = pmd_offset(pudp, address);
458 if (pmd_none(*pmdp))
459 goto out_irqs_on;
460
461 ptep = pte_offset_map(pmdp, address);
462 pte = *ptep;
463 if (!pte_present(pte))
464 goto out_unmap;
465
466 paddr = (unsigned long) page_address(pte_page(pte));
467
468 __asm__ __volatile__("flush %0 + %1"
469 : /* no outputs */
470 : "r" (paddr),
471 "r" (address & (PAGE_SIZE - 1))
472 : "memory");
473
474out_unmap:
475 pte_unmap(ptep);
476out_irqs_on:
477 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
478
479}
480
481static int setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
482 int signo, sigset_t *oldset)
483{
484 struct signal_frame32 __user *sf;
485 int i, err, wsaved;
486 void __user *tail;
487 int sigframe_size;
488 u32 psr;
489 unsigned int seta[_COMPAT_NSIG_WORDS];
490
491 /* 1. Make sure everything is clean */
492 synchronize_user_stack();
493 save_and_clear_fpu();
494
495 wsaved = get_thread_wsaved();
496
497 sigframe_size = sizeof(*sf);
498 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
499 sigframe_size += sizeof(__siginfo_fpu_t);
500 if (wsaved)
501 sigframe_size += sizeof(__siginfo_rwin_t);
502
503 sf = (struct signal_frame32 __user *)
504 get_sigframe(&ka->sa, regs, sigframe_size);
505
506 if (invalid_frame_pointer(sf, sigframe_size))
507 goto sigill;
508
509 tail = (sf + 1);
510
511 /* 2. Save the current process state */
512 if (test_thread_flag(TIF_32BIT)) {
513 regs->tpc &= 0xffffffff;
514 regs->tnpc &= 0xffffffff;
515 }
516 err = put_user(regs->tpc, &sf->info.si_regs.pc);
517 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
518 err |= __put_user(regs->y, &sf->info.si_regs.y);
519 psr = tstate_to_psr(regs->tstate);
520 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
521 psr |= PSR_EF;
522 err |= __put_user(psr, &sf->info.si_regs.psr);
523 for (i = 0; i < 16; i++)
524 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
525 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
526 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
527 for (i = 1; i < 16; i++)
528 err |= __put_user(((u32 *)regs->u_regs)[2*i],
529 &sf->v8plus.g_upper[i]);
530 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
531 &sf->v8plus.asi);
532
533 if (psr & PSR_EF) {
534 __siginfo_fpu_t __user *fp = tail;
535 tail += sizeof(*fp);
536 err |= save_fpu_state(regs, fp);
537 err |= __put_user((u64)fp, &sf->fpu_save);
538 } else {
539 err |= __put_user(0, &sf->fpu_save);
540 }
541 if (wsaved) {
542 __siginfo_rwin_t __user *rwp = tail;
543 tail += sizeof(*rwp);
544 err |= save_rwin_state(wsaved, rwp);
545 err |= __put_user((u64)rwp, &sf->rwin_save);
546 set_thread_wsaved(0);
547 } else {
548 err |= __put_user(0, &sf->rwin_save);
549 }
550
551 switch (_NSIG_WORDS) {
552 case 4: seta[7] = (oldset->sig[3] >> 32);
553 seta[6] = oldset->sig[3];
554 case 3: seta[5] = (oldset->sig[2] >> 32);
555 seta[4] = oldset->sig[2];
556 case 2: seta[3] = (oldset->sig[1] >> 32);
557 seta[2] = oldset->sig[1];
558 case 1: seta[1] = (oldset->sig[0] >> 32);
559 seta[0] = oldset->sig[0];
560 }
561 err |= __put_user(seta[0], &sf->info.si_mask);
562 err |= __copy_to_user(sf->extramask, seta + 1,
563 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
564
565 if (!wsaved) {
566 err |= copy_in_user((u32 __user *)sf,
567 (u32 __user *)(regs->u_regs[UREG_FP]),
568 sizeof(struct reg_window32));
569 } else {
570 struct reg_window *rp;
571
572 rp = ¤t_thread_info()->reg_window[wsaved - 1];
573 for (i = 0; i < 8; i++)
574 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
575 for (i = 0; i < 6; i++)
576 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
577 err |= __put_user(rp->ins[6], &sf->ss.fp);
578 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
579 }
580 if (err)
581 goto sigsegv;
582
583 /* 3. signal handler back-trampoline and parameters */
584 regs->u_regs[UREG_FP] = (unsigned long) sf;
585 regs->u_regs[UREG_I0] = signo;
586 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
587 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
588
589 /* 4. signal handler */
590 regs->tpc = (unsigned long) ka->sa.sa_handler;
591 regs->tnpc = (regs->tpc + 4);
592 if (test_thread_flag(TIF_32BIT)) {
593 regs->tpc &= 0xffffffff;
594 regs->tnpc &= 0xffffffff;
595 }
596
597 /* 5. return to kernel instructions */
598 if (ka->ka_restorer) {
599 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
600 } else {
601 unsigned long address = ((unsigned long)&(sf->insns[0]));
602
603 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
604
605 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
606 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
607 if (err)
608 goto sigsegv;
609 flush_signal_insns(address);
610 }
611 return 0;
612
613sigill:
614 do_exit(SIGILL);
615 return -EINVAL;
616
617sigsegv:
618 force_sigsegv(signo, current);
619 return -EFAULT;
620}
621
622static int setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
623 unsigned long signr, sigset_t *oldset,
624 siginfo_t *info)
625{
626 struct rt_signal_frame32 __user *sf;
627 int i, err, wsaved;
628 void __user *tail;
629 int sigframe_size;
630 u32 psr;
631 compat_sigset_t seta;
632
633 /* 1. Make sure everything is clean */
634 synchronize_user_stack();
635 save_and_clear_fpu();
636
637 wsaved = get_thread_wsaved();
638
639 sigframe_size = sizeof(*sf);
640 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
641 sigframe_size += sizeof(__siginfo_fpu_t);
642 if (wsaved)
643 sigframe_size += sizeof(__siginfo_rwin_t);
644
645 sf = (struct rt_signal_frame32 __user *)
646 get_sigframe(&ka->sa, regs, sigframe_size);
647
648 if (invalid_frame_pointer(sf, sigframe_size))
649 goto sigill;
650
651 tail = (sf + 1);
652
653 /* 2. Save the current process state */
654 if (test_thread_flag(TIF_32BIT)) {
655 regs->tpc &= 0xffffffff;
656 regs->tnpc &= 0xffffffff;
657 }
658 err = put_user(regs->tpc, &sf->regs.pc);
659 err |= __put_user(regs->tnpc, &sf->regs.npc);
660 err |= __put_user(regs->y, &sf->regs.y);
661 psr = tstate_to_psr(regs->tstate);
662 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
663 psr |= PSR_EF;
664 err |= __put_user(psr, &sf->regs.psr);
665 for (i = 0; i < 16; i++)
666 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
667 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
668 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
669 for (i = 1; i < 16; i++)
670 err |= __put_user(((u32 *)regs->u_regs)[2*i],
671 &sf->v8plus.g_upper[i]);
672 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
673 &sf->v8plus.asi);
674
675 if (psr & PSR_EF) {
676 __siginfo_fpu_t __user *fp = tail;
677 tail += sizeof(*fp);
678 err |= save_fpu_state(regs, fp);
679 err |= __put_user((u64)fp, &sf->fpu_save);
680 } else {
681 err |= __put_user(0, &sf->fpu_save);
682 }
683 if (wsaved) {
684 __siginfo_rwin_t __user *rwp = tail;
685 tail += sizeof(*rwp);
686 err |= save_rwin_state(wsaved, rwp);
687 err |= __put_user((u64)rwp, &sf->rwin_save);
688 set_thread_wsaved(0);
689 } else {
690 err |= __put_user(0, &sf->rwin_save);
691 }
692
693 /* Update the siginfo structure. */
694 err |= copy_siginfo_to_user32(&sf->info, info);
695
696 /* Setup sigaltstack */
697 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
698 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
699 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
700
701 switch (_NSIG_WORDS) {
702 case 4: seta.sig[7] = (oldset->sig[3] >> 32);
703 seta.sig[6] = oldset->sig[3];
704 case 3: seta.sig[5] = (oldset->sig[2] >> 32);
705 seta.sig[4] = oldset->sig[2];
706 case 2: seta.sig[3] = (oldset->sig[1] >> 32);
707 seta.sig[2] = oldset->sig[1];
708 case 1: seta.sig[1] = (oldset->sig[0] >> 32);
709 seta.sig[0] = oldset->sig[0];
710 }
711 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
712
713 if (!wsaved) {
714 err |= copy_in_user((u32 __user *)sf,
715 (u32 __user *)(regs->u_regs[UREG_FP]),
716 sizeof(struct reg_window32));
717 } else {
718 struct reg_window *rp;
719
720 rp = ¤t_thread_info()->reg_window[wsaved - 1];
721 for (i = 0; i < 8; i++)
722 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
723 for (i = 0; i < 6; i++)
724 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
725 err |= __put_user(rp->ins[6], &sf->ss.fp);
726 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
727 }
728 if (err)
729 goto sigsegv;
730
731 /* 3. signal handler back-trampoline and parameters */
732 regs->u_regs[UREG_FP] = (unsigned long) sf;
733 regs->u_regs[UREG_I0] = signr;
734 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
735 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
736
737 /* 4. signal handler */
738 regs->tpc = (unsigned long) ka->sa.sa_handler;
739 regs->tnpc = (regs->tpc + 4);
740 if (test_thread_flag(TIF_32BIT)) {
741 regs->tpc &= 0xffffffff;
742 regs->tnpc &= 0xffffffff;
743 }
744
745 /* 5. return to kernel instructions */
746 if (ka->ka_restorer)
747 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
748 else {
749 unsigned long address = ((unsigned long)&(sf->insns[0]));
750
751 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
752
753 /* mov __NR_rt_sigreturn, %g1 */
754 err |= __put_user(0x82102065, &sf->insns[0]);
755
756 /* t 0x10 */
757 err |= __put_user(0x91d02010, &sf->insns[1]);
758 if (err)
759 goto sigsegv;
760
761 flush_signal_insns(address);
762 }
763 return 0;
764
765sigill:
766 do_exit(SIGILL);
767 return -EINVAL;
768
769sigsegv:
770 force_sigsegv(signr, current);
771 return -EFAULT;
772}
773
774static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka,
775 siginfo_t *info,
776 sigset_t *oldset, struct pt_regs *regs)
777{
778 int err;
779
780 if (ka->sa.sa_flags & SA_SIGINFO)
781 err = setup_rt_frame32(ka, regs, signr, oldset, info);
782 else
783 err = setup_frame32(ka, regs, signr, oldset);
784
785 if (err)
786 return;
787
788 signal_delivered(signr, info, ka, regs, 0);
789}
790
791static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
792 struct sigaction *sa)
793{
794 switch (regs->u_regs[UREG_I0]) {
795 case ERESTART_RESTARTBLOCK:
796 case ERESTARTNOHAND:
797 no_system_call_restart:
798 regs->u_regs[UREG_I0] = EINTR;
799 regs->tstate |= TSTATE_ICARRY;
800 break;
801 case ERESTARTSYS:
802 if (!(sa->sa_flags & SA_RESTART))
803 goto no_system_call_restart;
804 /* fallthrough */
805 case ERESTARTNOINTR:
806 regs->u_regs[UREG_I0] = orig_i0;
807 regs->tpc -= 4;
808 regs->tnpc -= 4;
809 }
810}
811
812/* Note that 'init' is a special process: it doesn't get signals it doesn't
813 * want to handle. Thus you cannot kill init even with a SIGKILL even by
814 * mistake.
815 */
816void do_signal32(sigset_t *oldset, struct pt_regs * regs)
817{
818 struct k_sigaction ka;
819 unsigned long orig_i0;
820 int restart_syscall;
821 siginfo_t info;
822 int signr;
823
824 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
825
826 restart_syscall = 0;
827 orig_i0 = 0;
828 if (pt_regs_is_syscall(regs) &&
829 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
830 restart_syscall = 1;
831 orig_i0 = regs->u_regs[UREG_G6];
832 }
833
834 if (signr > 0) {
835 if (restart_syscall)
836 syscall_restart32(orig_i0, regs, &ka.sa);
837 handle_signal32(signr, &ka, &info, oldset, regs);
838 return;
839 }
840 if (restart_syscall &&
841 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
842 regs->u_regs[UREG_I0] == ERESTARTSYS ||
843 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
844 /* replay the system call when we are done */
845 regs->u_regs[UREG_I0] = orig_i0;
846 regs->tpc -= 4;
847 regs->tnpc -= 4;
848 pt_regs_clear_syscall(regs);
849 }
850 if (restart_syscall &&
851 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
852 regs->u_regs[UREG_G1] = __NR_restart_syscall;
853 regs->tpc -= 4;
854 regs->tnpc -= 4;
855 pt_regs_clear_syscall(regs);
856 }
857
858 /* If there's no signal to deliver, we just put the saved sigmask
859 * back
860 */
861 restore_saved_sigmask();
862}
863
864struct sigstack32 {
865 u32 the_stack;
866 int cur_status;
867};
868
869asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
870{
871 struct sigstack32 __user *ssptr =
872 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
873 struct sigstack32 __user *ossptr =
874 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
875 int ret = -EFAULT;
876
877 /* First see if old state is wanted. */
878 if (ossptr) {
879 if (put_user(current->sas_ss_sp + current->sas_ss_size,
880 &ossptr->the_stack) ||
881 __put_user(on_sig_stack(sp), &ossptr->cur_status))
882 goto out;
883 }
884
885 /* Now see if we want to update the new state. */
886 if (ssptr) {
887 u32 ss_sp;
888
889 if (get_user(ss_sp, &ssptr->the_stack))
890 goto out;
891
892 /* If the current stack was set with sigaltstack, don't
893 * swap stacks while we are on it.
894 */
895 ret = -EPERM;
896 if (current->sas_ss_sp && on_sig_stack(sp))
897 goto out;
898
899 /* Since we don't know the extent of the stack, and we don't
900 * track onstack-ness, but rather calculate it, we must
901 * presume a size. Ho hum this interface is lossy.
902 */
903 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
904 current->sas_ss_size = SIGSTKSZ;
905 }
906
907 ret = 0;
908out:
909 return ret;
910}
911
912asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp)
913{
914 stack_t uss, uoss;
915 u32 u_ss_sp = 0;
916 int ret;
917 mm_segment_t old_fs;
918 stack_t32 __user *uss32 = compat_ptr(ussa);
919 stack_t32 __user *uoss32 = compat_ptr(uossa);
920
921 if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) ||
922 __get_user(uss.ss_flags, &uss32->ss_flags) ||
923 __get_user(uss.ss_size, &uss32->ss_size)))
924 return -EFAULT;
925 uss.ss_sp = compat_ptr(u_ss_sp);
926 old_fs = get_fs();
927 set_fs(KERNEL_DS);
928 ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL,
929 uossa ? (stack_t __user *) &uoss : NULL, sp);
930 set_fs(old_fs);
931 if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) ||
932 __put_user(uoss.ss_flags, &uoss32->ss_flags) ||
933 __put_user(uoss.ss_size, &uoss32->ss_size)))
934 return -EFAULT;
935 return ret;
936}
1// 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);