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