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