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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
32#include "sigutil.h"
33
34#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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
58typedef struct compat_siginfo{
59 int si_signo;
60 int si_errno;
61 int si_code;
62
63 union {
64 int _pad[SI_PAD_SIZE32];
65
66 /* kill() */
67 struct {
68 compat_pid_t _pid; /* sender's pid */
69 unsigned int _uid; /* sender's uid */
70 } _kill;
71
72 /* POSIX.1b timers */
73 struct {
74 compat_timer_t _tid; /* timer id */
75 int _overrun; /* overrun count */
76 compat_sigval_t _sigval; /* same as below */
77 int _sys_private; /* not to be passed to user */
78 } _timer;
79
80 /* POSIX.1b signals */
81 struct {
82 compat_pid_t _pid; /* sender's pid */
83 unsigned int _uid; /* sender's uid */
84 compat_sigval_t _sigval;
85 } _rt;
86
87 /* SIGCHLD */
88 struct {
89 compat_pid_t _pid; /* which child */
90 unsigned int _uid; /* sender's uid */
91 int _status; /* exit code */
92 compat_clock_t _utime;
93 compat_clock_t _stime;
94 } _sigchld;
95
96 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */
97 struct {
98 u32 _addr; /* faulting insn/memory ref. */
99 int _trapno;
100 } _sigfault;
101
102 /* SIGPOLL */
103 struct {
104 int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
105 int _fd;
106 } _sigpoll;
107 } _sifields;
108}compat_siginfo_t;
109
110struct rt_signal_frame32 {
111 struct sparc_stackf32 ss;
112 compat_siginfo_t info;
113 struct pt_regs32 regs;
114 compat_sigset_t mask;
115 /* __siginfo_fpu_t * */ u32 fpu_save;
116 unsigned int insns[2];
117 stack_t32 stack;
118 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
119 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
120 siginfo_extra_v8plus_t v8plus;
121 /* __siginfo_rwin_t * */u32 rwin_save;
122} __attribute__((aligned(8)));
123
124int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
125{
126 int err;
127
128 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
129 return -EFAULT;
130
131 /* If you change siginfo_t structure, please be sure
132 this code is fixed accordingly.
133 It should never copy any pad contained in the structure
134 to avoid security leaks, but must copy the generic
135 3 ints plus the relevant union member.
136 This routine must convert siginfo from 64bit to 32bit as well
137 at the same time. */
138 err = __put_user(from->si_signo, &to->si_signo);
139 err |= __put_user(from->si_errno, &to->si_errno);
140 err |= __put_user((short)from->si_code, &to->si_code);
141 if (from->si_code < 0)
142 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
143 else {
144 switch (from->si_code >> 16) {
145 case __SI_TIMER >> 16:
146 err |= __put_user(from->si_tid, &to->si_tid);
147 err |= __put_user(from->si_overrun, &to->si_overrun);
148 err |= __put_user(from->si_int, &to->si_int);
149 break;
150 case __SI_CHLD >> 16:
151 err |= __put_user(from->si_utime, &to->si_utime);
152 err |= __put_user(from->si_stime, &to->si_stime);
153 err |= __put_user(from->si_status, &to->si_status);
154 default:
155 err |= __put_user(from->si_pid, &to->si_pid);
156 err |= __put_user(from->si_uid, &to->si_uid);
157 break;
158 case __SI_FAULT >> 16:
159 err |= __put_user(from->si_trapno, &to->si_trapno);
160 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
161 break;
162 case __SI_POLL >> 16:
163 err |= __put_user(from->si_band, &to->si_band);
164 err |= __put_user(from->si_fd, &to->si_fd);
165 break;
166 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
167 case __SI_MESGQ >> 16:
168 err |= __put_user(from->si_pid, &to->si_pid);
169 err |= __put_user(from->si_uid, &to->si_uid);
170 err |= __put_user(from->si_int, &to->si_int);
171 break;
172 }
173 }
174 return err;
175}
176
177/* CAUTION: This is just a very minimalist implementation for the
178 * sake of compat_sys_rt_sigqueueinfo()
179 */
180int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
181{
182 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
183 return -EFAULT;
184
185 if (copy_from_user(to, from, 3*sizeof(int)) ||
186 copy_from_user(to->_sifields._pad, from->_sifields._pad,
187 SI_PAD_SIZE))
188 return -EFAULT;
189
190 return 0;
191}
192
193void do_sigreturn32(struct pt_regs *regs)
194{
195 struct signal_frame32 __user *sf;
196 compat_uptr_t fpu_save;
197 compat_uptr_t rwin_save;
198 unsigned int psr;
199 unsigned pc, npc;
200 sigset_t set;
201 unsigned seta[_COMPAT_NSIG_WORDS];
202 int err, i;
203
204 /* Always make any pending restarted system calls return -EINTR */
205 current_thread_info()->restart_block.fn = do_no_restart_syscall;
206
207 synchronize_user_stack();
208
209 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
210 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
211
212 /* 1. Make sure we are not getting garbage from the user */
213 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
214 (((unsigned long) sf) & 3))
215 goto segv;
216
217 get_user(pc, &sf->info.si_regs.pc);
218 __get_user(npc, &sf->info.si_regs.npc);
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 sigdelsetmask(&set, ~_BLOCKABLE);
276 set_current_blocked(&set);
277 return;
278
279segv:
280 force_sig(SIGSEGV, current);
281}
282
283asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
284{
285 struct rt_signal_frame32 __user *sf;
286 unsigned int psr, pc, npc, u_ss_sp;
287 compat_uptr_t fpu_save;
288 compat_uptr_t rwin_save;
289 mm_segment_t old_fs;
290 sigset_t set;
291 compat_sigset_t seta;
292 stack_t st;
293 int err, i;
294
295 /* Always make any pending restarted system calls return -EINTR */
296 current_thread_info()->restart_block.fn = do_no_restart_syscall;
297
298 synchronize_user_stack();
299 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
300 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
301
302 /* 1. Make sure we are not getting garbage from the user */
303 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
304 (((unsigned long) sf) & 3))
305 goto segv;
306
307 get_user(pc, &sf->regs.pc);
308 __get_user(npc, &sf->regs.npc);
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 sigdelsetmask(&set, ~_BLOCKABLE);
377 set_current_blocked(&set);
378 return;
379segv:
380 force_sig(SIGSEGV, current);
381}
382
383/* Checks if the fp is valid */
384static int invalid_frame_pointer(void __user *fp, int fplen)
385{
386 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
387 return 1;
388 return 0;
389}
390
391static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
392{
393 unsigned long sp;
394
395 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
396 sp = regs->u_regs[UREG_FP];
397
398 /*
399 * If we are on the alternate signal stack and would overflow it, don't.
400 * Return an always-bogus address instead so we will die with SIGSEGV.
401 */
402 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
403 return (void __user *) -1L;
404
405 /* This is the X/Open sanctioned signal stack switching. */
406 if (sa->sa_flags & SA_ONSTACK) {
407 if (sas_ss_flags(sp) == 0)
408 sp = current->sas_ss_sp + current->sas_ss_size;
409 }
410
411 sp -= framesize;
412
413 /* Always align the stack frame. This handles two cases. First,
414 * sigaltstack need not be mindful of platform specific stack
415 * alignment. Second, if we took this signal because the stack
416 * is not aligned properly, we'd like to take the signal cleanly
417 * and report that.
418 */
419 sp &= ~15UL;
420
421 return (void __user *) sp;
422}
423
424/* The I-cache flush instruction only works in the primary ASI, which
425 * right now is the nucleus, aka. kernel space.
426 *
427 * Therefore we have to kick the instructions out using the kernel
428 * side linear mapping of the physical address backing the user
429 * instructions.
430 */
431static void flush_signal_insns(unsigned long address)
432{
433 unsigned long pstate, paddr;
434 pte_t *ptep, pte;
435 pgd_t *pgdp;
436 pud_t *pudp;
437 pmd_t *pmdp;
438
439 /* Commit all stores of the instructions we are about to flush. */
440 wmb();
441
442 /* Disable cross-call reception. In this way even a very wide
443 * munmap() on another cpu can't tear down the page table
444 * hierarchy from underneath us, since that can't complete
445 * until the IPI tlb flush returns.
446 */
447
448 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
449 __asm__ __volatile__("wrpr %0, %1, %%pstate"
450 : : "r" (pstate), "i" (PSTATE_IE));
451
452 pgdp = pgd_offset(current->mm, address);
453 if (pgd_none(*pgdp))
454 goto out_irqs_on;
455 pudp = pud_offset(pgdp, address);
456 if (pud_none(*pudp))
457 goto out_irqs_on;
458 pmdp = pmd_offset(pudp, address);
459 if (pmd_none(*pmdp))
460 goto out_irqs_on;
461
462 ptep = pte_offset_map(pmdp, address);
463 pte = *ptep;
464 if (!pte_present(pte))
465 goto out_unmap;
466
467 paddr = (unsigned long) page_address(pte_page(pte));
468
469 __asm__ __volatile__("flush %0 + %1"
470 : /* no outputs */
471 : "r" (paddr),
472 "r" (address & (PAGE_SIZE - 1))
473 : "memory");
474
475out_unmap:
476 pte_unmap(ptep);
477out_irqs_on:
478 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
479
480}
481
482static int setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
483 int signo, sigset_t *oldset)
484{
485 struct signal_frame32 __user *sf;
486 int i, err, wsaved;
487 void __user *tail;
488 int sigframe_size;
489 u32 psr;
490 unsigned int seta[_COMPAT_NSIG_WORDS];
491
492 /* 1. Make sure everything is clean */
493 synchronize_user_stack();
494 save_and_clear_fpu();
495
496 wsaved = get_thread_wsaved();
497
498 sigframe_size = sizeof(*sf);
499 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
500 sigframe_size += sizeof(__siginfo_fpu_t);
501 if (wsaved)
502 sigframe_size += sizeof(__siginfo_rwin_t);
503
504 sf = (struct signal_frame32 __user *)
505 get_sigframe(&ka->sa, regs, sigframe_size);
506
507 if (invalid_frame_pointer(sf, sigframe_size))
508 goto sigill;
509
510 tail = (sf + 1);
511
512 /* 2. Save the current process state */
513 if (test_thread_flag(TIF_32BIT)) {
514 regs->tpc &= 0xffffffff;
515 regs->tnpc &= 0xffffffff;
516 }
517 err = put_user(regs->tpc, &sf->info.si_regs.pc);
518 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
519 err |= __put_user(regs->y, &sf->info.si_regs.y);
520 psr = tstate_to_psr(regs->tstate);
521 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
522 psr |= PSR_EF;
523 err |= __put_user(psr, &sf->info.si_regs.psr);
524 for (i = 0; i < 16; i++)
525 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
526 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
527 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
528 for (i = 1; i < 16; i++)
529 err |= __put_user(((u32 *)regs->u_regs)[2*i],
530 &sf->v8plus.g_upper[i]);
531 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
532 &sf->v8plus.asi);
533
534 if (psr & PSR_EF) {
535 __siginfo_fpu_t __user *fp = tail;
536 tail += sizeof(*fp);
537 err |= save_fpu_state(regs, fp);
538 err |= __put_user((u64)fp, &sf->fpu_save);
539 } else {
540 err |= __put_user(0, &sf->fpu_save);
541 }
542 if (wsaved) {
543 __siginfo_rwin_t __user *rwp = tail;
544 tail += sizeof(*rwp);
545 err |= save_rwin_state(wsaved, rwp);
546 err |= __put_user((u64)rwp, &sf->rwin_save);
547 set_thread_wsaved(0);
548 } else {
549 err |= __put_user(0, &sf->rwin_save);
550 }
551
552 switch (_NSIG_WORDS) {
553 case 4: seta[7] = (oldset->sig[3] >> 32);
554 seta[6] = oldset->sig[3];
555 case 3: seta[5] = (oldset->sig[2] >> 32);
556 seta[4] = oldset->sig[2];
557 case 2: seta[3] = (oldset->sig[1] >> 32);
558 seta[2] = oldset->sig[1];
559 case 1: seta[1] = (oldset->sig[0] >> 32);
560 seta[0] = oldset->sig[0];
561 }
562 err |= __put_user(seta[0], &sf->info.si_mask);
563 err |= __copy_to_user(sf->extramask, seta + 1,
564 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
565
566 if (!wsaved) {
567 err |= copy_in_user((u32 __user *)sf,
568 (u32 __user *)(regs->u_regs[UREG_FP]),
569 sizeof(struct reg_window32));
570 } else {
571 struct reg_window *rp;
572
573 rp = ¤t_thread_info()->reg_window[wsaved - 1];
574 for (i = 0; i < 8; i++)
575 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
576 for (i = 0; i < 6; i++)
577 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
578 err |= __put_user(rp->ins[6], &sf->ss.fp);
579 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
580 }
581 if (err)
582 goto sigsegv;
583
584 /* 3. signal handler back-trampoline and parameters */
585 regs->u_regs[UREG_FP] = (unsigned long) sf;
586 regs->u_regs[UREG_I0] = signo;
587 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
588 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
589
590 /* 4. signal handler */
591 regs->tpc = (unsigned long) ka->sa.sa_handler;
592 regs->tnpc = (regs->tpc + 4);
593 if (test_thread_flag(TIF_32BIT)) {
594 regs->tpc &= 0xffffffff;
595 regs->tnpc &= 0xffffffff;
596 }
597
598 /* 5. return to kernel instructions */
599 if (ka->ka_restorer) {
600 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
601 } else {
602 unsigned long address = ((unsigned long)&(sf->insns[0]));
603
604 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
605
606 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
607 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
608 if (err)
609 goto sigsegv;
610 flush_signal_insns(address);
611 }
612 return 0;
613
614sigill:
615 do_exit(SIGILL);
616 return -EINVAL;
617
618sigsegv:
619 force_sigsegv(signo, current);
620 return -EFAULT;
621}
622
623static int setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
624 unsigned long signr, sigset_t *oldset,
625 siginfo_t *info)
626{
627 struct rt_signal_frame32 __user *sf;
628 int i, err, wsaved;
629 void __user *tail;
630 int sigframe_size;
631 u32 psr;
632 compat_sigset_t seta;
633
634 /* 1. Make sure everything is clean */
635 synchronize_user_stack();
636 save_and_clear_fpu();
637
638 wsaved = get_thread_wsaved();
639
640 sigframe_size = sizeof(*sf);
641 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
642 sigframe_size += sizeof(__siginfo_fpu_t);
643 if (wsaved)
644 sigframe_size += sizeof(__siginfo_rwin_t);
645
646 sf = (struct rt_signal_frame32 __user *)
647 get_sigframe(&ka->sa, regs, sigframe_size);
648
649 if (invalid_frame_pointer(sf, sigframe_size))
650 goto sigill;
651
652 tail = (sf + 1);
653
654 /* 2. Save the current process state */
655 if (test_thread_flag(TIF_32BIT)) {
656 regs->tpc &= 0xffffffff;
657 regs->tnpc &= 0xffffffff;
658 }
659 err = put_user(regs->tpc, &sf->regs.pc);
660 err |= __put_user(regs->tnpc, &sf->regs.npc);
661 err |= __put_user(regs->y, &sf->regs.y);
662 psr = tstate_to_psr(regs->tstate);
663 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
664 psr |= PSR_EF;
665 err |= __put_user(psr, &sf->regs.psr);
666 for (i = 0; i < 16; i++)
667 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
668 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
669 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
670 for (i = 1; i < 16; i++)
671 err |= __put_user(((u32 *)regs->u_regs)[2*i],
672 &sf->v8plus.g_upper[i]);
673 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
674 &sf->v8plus.asi);
675
676 if (psr & PSR_EF) {
677 __siginfo_fpu_t __user *fp = tail;
678 tail += sizeof(*fp);
679 err |= save_fpu_state(regs, fp);
680 err |= __put_user((u64)fp, &sf->fpu_save);
681 } else {
682 err |= __put_user(0, &sf->fpu_save);
683 }
684 if (wsaved) {
685 __siginfo_rwin_t __user *rwp = tail;
686 tail += sizeof(*rwp);
687 err |= save_rwin_state(wsaved, rwp);
688 err |= __put_user((u64)rwp, &sf->rwin_save);
689 set_thread_wsaved(0);
690 } else {
691 err |= __put_user(0, &sf->rwin_save);
692 }
693
694 /* Update the siginfo structure. */
695 err |= copy_siginfo_to_user32(&sf->info, info);
696
697 /* Setup sigaltstack */
698 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
699 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
700 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
701
702 switch (_NSIG_WORDS) {
703 case 4: seta.sig[7] = (oldset->sig[3] >> 32);
704 seta.sig[6] = oldset->sig[3];
705 case 3: seta.sig[5] = (oldset->sig[2] >> 32);
706 seta.sig[4] = oldset->sig[2];
707 case 2: seta.sig[3] = (oldset->sig[1] >> 32);
708 seta.sig[2] = oldset->sig[1];
709 case 1: seta.sig[1] = (oldset->sig[0] >> 32);
710 seta.sig[0] = oldset->sig[0];
711 }
712 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
713
714 if (!wsaved) {
715 err |= copy_in_user((u32 __user *)sf,
716 (u32 __user *)(regs->u_regs[UREG_FP]),
717 sizeof(struct reg_window32));
718 } else {
719 struct reg_window *rp;
720
721 rp = ¤t_thread_info()->reg_window[wsaved - 1];
722 for (i = 0; i < 8; i++)
723 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
724 for (i = 0; i < 6; i++)
725 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
726 err |= __put_user(rp->ins[6], &sf->ss.fp);
727 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
728 }
729 if (err)
730 goto sigsegv;
731
732 /* 3. signal handler back-trampoline and parameters */
733 regs->u_regs[UREG_FP] = (unsigned long) sf;
734 regs->u_regs[UREG_I0] = signr;
735 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
736 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
737
738 /* 4. signal handler */
739 regs->tpc = (unsigned long) ka->sa.sa_handler;
740 regs->tnpc = (regs->tpc + 4);
741 if (test_thread_flag(TIF_32BIT)) {
742 regs->tpc &= 0xffffffff;
743 regs->tnpc &= 0xffffffff;
744 }
745
746 /* 5. return to kernel instructions */
747 if (ka->ka_restorer)
748 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
749 else {
750 unsigned long address = ((unsigned long)&(sf->insns[0]));
751
752 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
753
754 /* mov __NR_rt_sigreturn, %g1 */
755 err |= __put_user(0x82102065, &sf->insns[0]);
756
757 /* t 0x10 */
758 err |= __put_user(0x91d02010, &sf->insns[1]);
759 if (err)
760 goto sigsegv;
761
762 flush_signal_insns(address);
763 }
764 return 0;
765
766sigill:
767 do_exit(SIGILL);
768 return -EINVAL;
769
770sigsegv:
771 force_sigsegv(signr, current);
772 return -EFAULT;
773}
774
775static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka,
776 siginfo_t *info,
777 sigset_t *oldset, struct pt_regs *regs)
778{
779 sigset_t blocked;
780 int err;
781
782 if (ka->sa.sa_flags & SA_SIGINFO)
783 err = setup_rt_frame32(ka, regs, signr, oldset, info);
784 else
785 err = setup_frame32(ka, regs, signr, oldset);
786
787 if (err)
788 return err;
789
790 sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask);
791 if (!(ka->sa.sa_flags & SA_NOMASK))
792 sigaddset(&blocked, signr);
793 set_current_blocked(&blocked);
794
795 tracehook_signal_handler(signr, info, ka, regs, 0);
796
797 return 0;
798}
799
800static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
801 struct sigaction *sa)
802{
803 switch (regs->u_regs[UREG_I0]) {
804 case ERESTART_RESTARTBLOCK:
805 case ERESTARTNOHAND:
806 no_system_call_restart:
807 regs->u_regs[UREG_I0] = EINTR;
808 regs->tstate |= TSTATE_ICARRY;
809 break;
810 case ERESTARTSYS:
811 if (!(sa->sa_flags & SA_RESTART))
812 goto no_system_call_restart;
813 /* fallthrough */
814 case ERESTARTNOINTR:
815 regs->u_regs[UREG_I0] = orig_i0;
816 regs->tpc -= 4;
817 regs->tnpc -= 4;
818 }
819}
820
821/* Note that 'init' is a special process: it doesn't get signals it doesn't
822 * want to handle. Thus you cannot kill init even with a SIGKILL even by
823 * mistake.
824 */
825void do_signal32(sigset_t *oldset, struct pt_regs * regs,
826 int restart_syscall, unsigned long orig_i0)
827{
828 struct k_sigaction ka;
829 siginfo_t info;
830 int signr;
831
832 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
833
834 /* If the debugger messes with the program counter, it clears
835 * the "in syscall" bit, directing us to not perform a syscall
836 * restart.
837 */
838 if (restart_syscall && !pt_regs_is_syscall(regs))
839 restart_syscall = 0;
840
841 if (signr > 0) {
842 if (restart_syscall)
843 syscall_restart32(orig_i0, regs, &ka.sa);
844 if (handle_signal32(signr, &ka, &info, oldset, regs) == 0) {
845 /* A signal was successfully delivered; the saved
846 * sigmask will have been stored in the signal frame,
847 * and will be restored by sigreturn, so we can simply
848 * clear the TS_RESTORE_SIGMASK flag.
849 */
850 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
851 }
852 return;
853 }
854 if (restart_syscall &&
855 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
856 regs->u_regs[UREG_I0] == ERESTARTSYS ||
857 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
858 /* replay the system call when we are done */
859 regs->u_regs[UREG_I0] = orig_i0;
860 regs->tpc -= 4;
861 regs->tnpc -= 4;
862 pt_regs_clear_syscall(regs);
863 }
864 if (restart_syscall &&
865 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
866 regs->u_regs[UREG_G1] = __NR_restart_syscall;
867 regs->tpc -= 4;
868 regs->tnpc -= 4;
869 pt_regs_clear_syscall(regs);
870 }
871
872 /* If there's no signal to deliver, we just put the saved sigmask
873 * back
874 */
875 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
876 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
877 set_current_blocked(¤t->saved_sigmask);
878 }
879}
880
881struct sigstack32 {
882 u32 the_stack;
883 int cur_status;
884};
885
886asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
887{
888 struct sigstack32 __user *ssptr =
889 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
890 struct sigstack32 __user *ossptr =
891 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
892 int ret = -EFAULT;
893
894 /* First see if old state is wanted. */
895 if (ossptr) {
896 if (put_user(current->sas_ss_sp + current->sas_ss_size,
897 &ossptr->the_stack) ||
898 __put_user(on_sig_stack(sp), &ossptr->cur_status))
899 goto out;
900 }
901
902 /* Now see if we want to update the new state. */
903 if (ssptr) {
904 u32 ss_sp;
905
906 if (get_user(ss_sp, &ssptr->the_stack))
907 goto out;
908
909 /* If the current stack was set with sigaltstack, don't
910 * swap stacks while we are on it.
911 */
912 ret = -EPERM;
913 if (current->sas_ss_sp && on_sig_stack(sp))
914 goto out;
915
916 /* Since we don't know the extent of the stack, and we don't
917 * track onstack-ness, but rather calculate it, we must
918 * presume a size. Ho hum this interface is lossy.
919 */
920 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
921 current->sas_ss_size = SIGSTKSZ;
922 }
923
924 ret = 0;
925out:
926 return ret;
927}
928
929asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp)
930{
931 stack_t uss, uoss;
932 u32 u_ss_sp = 0;
933 int ret;
934 mm_segment_t old_fs;
935 stack_t32 __user *uss32 = compat_ptr(ussa);
936 stack_t32 __user *uoss32 = compat_ptr(uossa);
937
938 if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) ||
939 __get_user(uss.ss_flags, &uss32->ss_flags) ||
940 __get_user(uss.ss_size, &uss32->ss_size)))
941 return -EFAULT;
942 uss.ss_sp = compat_ptr(u_ss_sp);
943 old_fs = get_fs();
944 set_fs(KERNEL_DS);
945 ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL,
946 uossa ? (stack_t __user *) &uoss : NULL, sp);
947 set_fs(old_fs);
948 if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) ||
949 __put_user(uoss.ss_flags, &uoss32->ss_flags) ||
950 __put_user(uoss.ss_size, &uoss32->ss_size)))
951 return -EFAULT;
952 return ret;
953}
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}