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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/pgtable.h>
28#include <asm/psrcompat.h>
29#include <asm/fpumacro.h>
30#include <asm/visasm.h>
31#include <asm/compat_signal.h>
32#include <asm/switch_to.h>
33
34#include "sigutil.h"
35#include "kernel.h"
36
37/* This magic should be in g_upper[0] for all upper parts
38 * to be valid.
39 */
40#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
41typedef struct {
42 unsigned int g_upper[8];
43 unsigned int o_upper[8];
44 unsigned int asi;
45} siginfo_extra_v8plus_t;
46
47struct signal_frame32 {
48 struct sparc_stackf32 ss;
49 __siginfo32_t info;
50 /* __siginfo_fpu_t * */ u32 fpu_save;
51 unsigned int insns[2];
52 unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
53 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
54 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
55 siginfo_extra_v8plus_t v8plus;
56 /* __siginfo_rwin_t * */u32 rwin_save;
57} __attribute__((aligned(8)));
58
59struct rt_signal_frame32 {
60 struct sparc_stackf32 ss;
61 compat_siginfo_t info;
62 struct pt_regs32 regs;
63 compat_sigset_t mask;
64 /* __siginfo_fpu_t * */ u32 fpu_save;
65 unsigned int insns[2];
66 compat_stack_t stack;
67 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
68 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
69 siginfo_extra_v8plus_t v8plus;
70 /* __siginfo_rwin_t * */u32 rwin_save;
71} __attribute__((aligned(8)));
72
73/* Checks if the fp is valid. We always build signal frames which are
74 * 16-byte aligned, therefore we can always enforce that the restore
75 * frame has that property as well.
76 */
77static bool invalid_frame_pointer(void __user *fp, int fplen)
78{
79 if ((((unsigned long) fp) & 15) ||
80 ((unsigned long)fp) > 0x100000000ULL - fplen)
81 return true;
82 return false;
83}
84
85void do_sigreturn32(struct pt_regs *regs)
86{
87 struct signal_frame32 __user *sf;
88 compat_uptr_t fpu_save;
89 compat_uptr_t rwin_save;
90 unsigned int psr, ufp;
91 unsigned int pc, npc;
92 sigset_t set;
93 compat_sigset_t seta;
94 int err, i;
95
96 /* Always make any pending restarted system calls return -EINTR */
97 current->restart_block.fn = do_no_restart_syscall;
98
99 synchronize_user_stack();
100
101 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
102 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
103
104 /* 1. Make sure we are not getting garbage from the user */
105 if (invalid_frame_pointer(sf, sizeof(*sf)))
106 goto segv;
107
108 if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
109 goto segv;
110
111 if (ufp & 0x7)
112 goto segv;
113
114 if (__get_user(pc, &sf->info.si_regs.pc) ||
115 __get_user(npc, &sf->info.si_regs.npc))
116 goto segv;
117
118 if ((pc | npc) & 3)
119 goto segv;
120
121 if (test_thread_flag(TIF_32BIT)) {
122 pc &= 0xffffffff;
123 npc &= 0xffffffff;
124 }
125 regs->tpc = pc;
126 regs->tnpc = npc;
127
128 /* 2. Restore the state */
129 err = __get_user(regs->y, &sf->info.si_regs.y);
130 err |= __get_user(psr, &sf->info.si_regs.psr);
131
132 for (i = UREG_G1; i <= UREG_I7; i++)
133 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
134 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
135 err |= __get_user(i, &sf->v8plus.g_upper[0]);
136 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
137 unsigned long asi;
138
139 for (i = UREG_G1; i <= UREG_I7; i++)
140 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
141 err |= __get_user(asi, &sf->v8plus.asi);
142 regs->tstate &= ~TSTATE_ASI;
143 regs->tstate |= ((asi & 0xffUL) << 24UL);
144 }
145 }
146
147 /* User can only change condition codes in %tstate. */
148 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
149 regs->tstate |= psr_to_tstate_icc(psr);
150
151 /* Prevent syscall restart. */
152 pt_regs_clear_syscall(regs);
153
154 err |= __get_user(fpu_save, &sf->fpu_save);
155 if (!err && fpu_save)
156 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
157 err |= __get_user(rwin_save, &sf->rwin_save);
158 if (!err && rwin_save) {
159 if (restore_rwin_state(compat_ptr(rwin_save)))
160 goto segv;
161 }
162 err |= __get_user(seta.sig[0], &sf->info.si_mask);
163 err |= copy_from_user(&seta.sig[1], &sf->extramask,
164 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
165 if (err)
166 goto segv;
167
168 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
169 set_current_blocked(&set);
170 return;
171
172segv:
173 force_sig(SIGSEGV);
174}
175
176asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
177{
178 struct rt_signal_frame32 __user *sf;
179 unsigned int psr, pc, npc, ufp;
180 compat_uptr_t fpu_save;
181 compat_uptr_t rwin_save;
182 sigset_t set;
183 int err, i;
184
185 /* Always make any pending restarted system calls return -EINTR */
186 current->restart_block.fn = do_no_restart_syscall;
187
188 synchronize_user_stack();
189 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
190 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
191
192 /* 1. Make sure we are not getting garbage from the user */
193 if (invalid_frame_pointer(sf, sizeof(*sf)))
194 goto segv;
195
196 if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
197 goto segv;
198
199 if (ufp & 0x7)
200 goto segv;
201
202 if (__get_user(pc, &sf->regs.pc) ||
203 __get_user(npc, &sf->regs.npc))
204 goto segv;
205
206 if ((pc | npc) & 3)
207 goto segv;
208
209 if (test_thread_flag(TIF_32BIT)) {
210 pc &= 0xffffffff;
211 npc &= 0xffffffff;
212 }
213 regs->tpc = pc;
214 regs->tnpc = npc;
215
216 /* 2. Restore the state */
217 err = __get_user(regs->y, &sf->regs.y);
218 err |= __get_user(psr, &sf->regs.psr);
219
220 for (i = UREG_G1; i <= UREG_I7; i++)
221 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
222 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
223 err |= __get_user(i, &sf->v8plus.g_upper[0]);
224 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
225 unsigned long asi;
226
227 for (i = UREG_G1; i <= UREG_I7; i++)
228 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
229 err |= __get_user(asi, &sf->v8plus.asi);
230 regs->tstate &= ~TSTATE_ASI;
231 regs->tstate |= ((asi & 0xffUL) << 24UL);
232 }
233 }
234
235 /* User can only change condition codes in %tstate. */
236 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
237 regs->tstate |= psr_to_tstate_icc(psr);
238
239 /* Prevent syscall restart. */
240 pt_regs_clear_syscall(regs);
241
242 err |= __get_user(fpu_save, &sf->fpu_save);
243 if (!err && fpu_save)
244 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
245 err |= get_compat_sigset(&set, &sf->mask);
246 err |= compat_restore_altstack(&sf->stack);
247 if (err)
248 goto segv;
249
250 err |= __get_user(rwin_save, &sf->rwin_save);
251 if (!err && rwin_save) {
252 if (restore_rwin_state(compat_ptr(rwin_save)))
253 goto segv;
254 }
255
256 set_current_blocked(&set);
257 return;
258segv:
259 force_sig(SIGSEGV);
260}
261
262static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
263{
264 unsigned long sp;
265
266 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
267 sp = regs->u_regs[UREG_FP];
268
269 /*
270 * If we are on the alternate signal stack and would overflow it, don't.
271 * Return an always-bogus address instead so we will die with SIGSEGV.
272 */
273 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
274 return (void __user *) -1L;
275
276 /* This is the X/Open sanctioned signal stack switching. */
277 sp = sigsp(sp, ksig) - framesize;
278
279 /* Always align the stack frame. This handles two cases. First,
280 * sigaltstack need not be mindful of platform specific stack
281 * alignment. Second, if we took this signal because the stack
282 * is not aligned properly, we'd like to take the signal cleanly
283 * and report that.
284 */
285 sp &= ~15UL;
286
287 return (void __user *) sp;
288}
289
290/* The I-cache flush instruction only works in the primary ASI, which
291 * right now is the nucleus, aka. kernel space.
292 *
293 * Therefore we have to kick the instructions out using the kernel
294 * side linear mapping of the physical address backing the user
295 * instructions.
296 */
297static void flush_signal_insns(unsigned long address)
298{
299 unsigned long pstate, paddr;
300 pte_t *ptep, pte;
301 pgd_t *pgdp;
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 pudp = pud_offset(pgdp, address);
322 if (pud_none(*pudp))
323 goto out_irqs_on;
324 pmdp = pmd_offset(pudp, address);
325 if (pmd_none(*pmdp))
326 goto out_irqs_on;
327
328 ptep = pte_offset_map(pmdp, address);
329 pte = *ptep;
330 if (!pte_present(pte))
331 goto out_unmap;
332
333 paddr = (unsigned long) page_address(pte_page(pte));
334
335 __asm__ __volatile__("flush %0 + %1"
336 : /* no outputs */
337 : "r" (paddr),
338 "r" (address & (PAGE_SIZE - 1))
339 : "memory");
340
341out_unmap:
342 pte_unmap(ptep);
343out_irqs_on:
344 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
345
346}
347
348static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
349 sigset_t *oldset)
350{
351 struct signal_frame32 __user *sf;
352 int i, err, wsaved;
353 void __user *tail;
354 int sigframe_size;
355 u32 psr;
356 compat_sigset_t seta;
357
358 /* 1. Make sure everything is clean */
359 synchronize_user_stack();
360 save_and_clear_fpu();
361
362 wsaved = get_thread_wsaved();
363
364 sigframe_size = sizeof(*sf);
365 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
366 sigframe_size += sizeof(__siginfo_fpu_t);
367 if (wsaved)
368 sigframe_size += sizeof(__siginfo_rwin_t);
369
370 sf = (struct signal_frame32 __user *)
371 get_sigframe(ksig, regs, sigframe_size);
372
373 if (invalid_frame_pointer(sf, sigframe_size)) {
374 if (show_unhandled_signals)
375 pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
376 current->comm, current->pid, (unsigned long)sf,
377 regs->tpc, regs->u_regs[UREG_I7]);
378 force_sigsegv(ksig->sig);
379 return -EINVAL;
380 }
381
382 tail = (sf + 1);
383
384 /* 2. Save the current process state */
385 if (test_thread_flag(TIF_32BIT)) {
386 regs->tpc &= 0xffffffff;
387 regs->tnpc &= 0xffffffff;
388 }
389 err = put_user(regs->tpc, &sf->info.si_regs.pc);
390 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
391 err |= __put_user(regs->y, &sf->info.si_regs.y);
392 psr = tstate_to_psr(regs->tstate);
393 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
394 psr |= PSR_EF;
395 err |= __put_user(psr, &sf->info.si_regs.psr);
396 for (i = 0; i < 16; i++)
397 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
398 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
399 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
400 for (i = 1; i < 16; i++)
401 err |= __put_user(((u32 *)regs->u_regs)[2*i],
402 &sf->v8plus.g_upper[i]);
403 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
404 &sf->v8plus.asi);
405
406 if (psr & PSR_EF) {
407 __siginfo_fpu_t __user *fp = tail;
408 tail += sizeof(*fp);
409 err |= save_fpu_state(regs, fp);
410 err |= __put_user((u64)fp, &sf->fpu_save);
411 } else {
412 err |= __put_user(0, &sf->fpu_save);
413 }
414 if (wsaved) {
415 __siginfo_rwin_t __user *rwp = tail;
416 tail += sizeof(*rwp);
417 err |= save_rwin_state(wsaved, rwp);
418 err |= __put_user((u64)rwp, &sf->rwin_save);
419 set_thread_wsaved(0);
420 } else {
421 err |= __put_user(0, &sf->rwin_save);
422 }
423
424 /* If these change we need to know - assignments to seta relies on these sizes */
425 BUILD_BUG_ON(_NSIG_WORDS != 1);
426 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
427 seta.sig[1] = (oldset->sig[0] >> 32);
428 seta.sig[0] = oldset->sig[0];
429
430 err |= __put_user(seta.sig[0], &sf->info.si_mask);
431 err |= __copy_to_user(sf->extramask, &seta.sig[1],
432 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
433
434 if (!wsaved) {
435 err |= copy_in_user((u32 __user *)sf,
436 (u32 __user *)(regs->u_regs[UREG_FP]),
437 sizeof(struct reg_window32));
438 } else {
439 struct reg_window *rp;
440
441 rp = ¤t_thread_info()->reg_window[wsaved - 1];
442 for (i = 0; i < 8; i++)
443 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
444 for (i = 0; i < 6; i++)
445 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
446 err |= __put_user(rp->ins[6], &sf->ss.fp);
447 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
448 }
449 if (err)
450 return err;
451
452 /* 3. signal handler back-trampoline and parameters */
453 regs->u_regs[UREG_FP] = (unsigned long) sf;
454 regs->u_regs[UREG_I0] = ksig->sig;
455 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
456 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
457
458 /* 4. signal handler */
459 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
460 regs->tnpc = (regs->tpc + 4);
461 if (test_thread_flag(TIF_32BIT)) {
462 regs->tpc &= 0xffffffff;
463 regs->tnpc &= 0xffffffff;
464 }
465
466 /* 5. return to kernel instructions */
467 if (ksig->ka.ka_restorer) {
468 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
469 } else {
470 unsigned long address = ((unsigned long)&(sf->insns[0]));
471
472 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
473
474 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
475 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
476 if (err)
477 return err;
478 flush_signal_insns(address);
479 }
480 return 0;
481}
482
483static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
484 sigset_t *oldset)
485{
486 struct rt_signal_frame32 __user *sf;
487 int i, err, wsaved;
488 void __user *tail;
489 int sigframe_size;
490 u32 psr;
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 rt_signal_frame32 __user *)
505 get_sigframe(ksig, regs, sigframe_size);
506
507 if (invalid_frame_pointer(sf, sigframe_size)) {
508 if (show_unhandled_signals)
509 pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
510 current->comm, current->pid, (unsigned long)sf,
511 regs->tpc, regs->u_regs[UREG_I7]);
512 force_sigsegv(ksig->sig);
513 return -EINVAL;
514 }
515
516 tail = (sf + 1);
517
518 /* 2. Save the current process state */
519 if (test_thread_flag(TIF_32BIT)) {
520 regs->tpc &= 0xffffffff;
521 regs->tnpc &= 0xffffffff;
522 }
523 err = put_user(regs->tpc, &sf->regs.pc);
524 err |= __put_user(regs->tnpc, &sf->regs.npc);
525 err |= __put_user(regs->y, &sf->regs.y);
526 psr = tstate_to_psr(regs->tstate);
527 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
528 psr |= PSR_EF;
529 err |= __put_user(psr, &sf->regs.psr);
530 for (i = 0; i < 16; i++)
531 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
532 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
533 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
534 for (i = 1; i < 16; i++)
535 err |= __put_user(((u32 *)regs->u_regs)[2*i],
536 &sf->v8plus.g_upper[i]);
537 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
538 &sf->v8plus.asi);
539
540 if (psr & PSR_EF) {
541 __siginfo_fpu_t __user *fp = tail;
542 tail += sizeof(*fp);
543 err |= save_fpu_state(regs, fp);
544 err |= __put_user((u64)fp, &sf->fpu_save);
545 } else {
546 err |= __put_user(0, &sf->fpu_save);
547 }
548 if (wsaved) {
549 __siginfo_rwin_t __user *rwp = tail;
550 tail += sizeof(*rwp);
551 err |= save_rwin_state(wsaved, rwp);
552 err |= __put_user((u64)rwp, &sf->rwin_save);
553 set_thread_wsaved(0);
554 } else {
555 err |= __put_user(0, &sf->rwin_save);
556 }
557
558 /* Update the siginfo structure. */
559 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
560
561 /* Setup sigaltstack */
562 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
563
564 err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t));
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 return err;
583
584 /* 3. signal handler back-trampoline and parameters */
585 regs->u_regs[UREG_FP] = (unsigned long) sf;
586 regs->u_regs[UREG_I0] = ksig->sig;
587 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
588 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
589
590 /* 4. signal handler */
591 regs->tpc = (unsigned long) ksig->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 (ksig->ka.ka_restorer)
600 regs->u_regs[UREG_I7] = (unsigned long)ksig->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 /* mov __NR_rt_sigreturn, %g1 */
607 err |= __put_user(0x82102065, &sf->insns[0]);
608
609 /* t 0x10 */
610 err |= __put_user(0x91d02010, &sf->insns[1]);
611 if (err)
612 return err;
613
614 flush_signal_insns(address);
615 }
616 return 0;
617}
618
619static inline void handle_signal32(struct ksignal *ksig,
620 struct pt_regs *regs)
621{
622 sigset_t *oldset = sigmask_to_save();
623 int err;
624
625 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
626 err = setup_rt_frame32(ksig, regs, oldset);
627 else
628 err = setup_frame32(ksig, regs, oldset);
629
630 signal_setup_done(err, ksig, 0);
631}
632
633static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
634 struct sigaction *sa)
635{
636 switch (regs->u_regs[UREG_I0]) {
637 case ERESTART_RESTARTBLOCK:
638 case ERESTARTNOHAND:
639 no_system_call_restart:
640 regs->u_regs[UREG_I0] = EINTR;
641 regs->tstate |= TSTATE_ICARRY;
642 break;
643 case ERESTARTSYS:
644 if (!(sa->sa_flags & SA_RESTART))
645 goto no_system_call_restart;
646 /* fallthrough */
647 case ERESTARTNOINTR:
648 regs->u_regs[UREG_I0] = orig_i0;
649 regs->tpc -= 4;
650 regs->tnpc -= 4;
651 }
652}
653
654/* Note that 'init' is a special process: it doesn't get signals it doesn't
655 * want to handle. Thus you cannot kill init even with a SIGKILL even by
656 * mistake.
657 */
658void do_signal32(struct pt_regs * regs)
659{
660 struct ksignal ksig;
661 unsigned long orig_i0 = 0;
662 int restart_syscall = 0;
663 bool has_handler = get_signal(&ksig);
664
665 if (pt_regs_is_syscall(regs) &&
666 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
667 restart_syscall = 1;
668 orig_i0 = regs->u_regs[UREG_G6];
669 }
670
671 if (has_handler) {
672 if (restart_syscall)
673 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
674 handle_signal32(&ksig, regs);
675 } else {
676 if (restart_syscall) {
677 switch (regs->u_regs[UREG_I0]) {
678 case ERESTARTNOHAND:
679 case ERESTARTSYS:
680 case ERESTARTNOINTR:
681 /* replay the system call when we are done */
682 regs->u_regs[UREG_I0] = orig_i0;
683 regs->tpc -= 4;
684 regs->tnpc -= 4;
685 pt_regs_clear_syscall(regs);
686 /* fall through */
687 case ERESTART_RESTARTBLOCK:
688 regs->u_regs[UREG_G1] = __NR_restart_syscall;
689 regs->tpc -= 4;
690 regs->tnpc -= 4;
691 pt_regs_clear_syscall(regs);
692 }
693 }
694 restore_saved_sigmask();
695 }
696}
697
698struct sigstack32 {
699 u32 the_stack;
700 int cur_status;
701};
702
703asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
704{
705 struct sigstack32 __user *ssptr =
706 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
707 struct sigstack32 __user *ossptr =
708 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
709 int ret = -EFAULT;
710
711 /* First see if old state is wanted. */
712 if (ossptr) {
713 if (put_user(current->sas_ss_sp + current->sas_ss_size,
714 &ossptr->the_stack) ||
715 __put_user(on_sig_stack(sp), &ossptr->cur_status))
716 goto out;
717 }
718
719 /* Now see if we want to update the new state. */
720 if (ssptr) {
721 u32 ss_sp;
722
723 if (get_user(ss_sp, &ssptr->the_stack))
724 goto out;
725
726 /* If the current stack was set with sigaltstack, don't
727 * swap stacks while we are on it.
728 */
729 ret = -EPERM;
730 if (current->sas_ss_sp && on_sig_stack(sp))
731 goto out;
732
733 /* Since we don't know the extent of the stack, and we don't
734 * track onstack-ness, but rather calculate it, we must
735 * presume a size. Ho hum this interface is lossy.
736 */
737 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
738 current->sas_ss_size = SIGSTKSZ;
739 }
740
741 ret = 0;
742out:
743 return ret;
744}