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