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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// 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
24#include <linux/uaccess.h>
25#include <asm/ptrace.h>
26#include <asm/psrcompat.h>
27#include <asm/fpumacro.h>
28#include <asm/visasm.h>
29#include <asm/compat_signal.h>
30#include <asm/switch_to.h>
31
32#include "sigutil.h"
33#include "kernel.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
57struct rt_signal_frame32 {
58 struct sparc_stackf32 ss;
59 compat_siginfo_t info;
60 struct pt_regs32 regs;
61 compat_sigset_t mask;
62 /* __siginfo_fpu_t * */ u32 fpu_save;
63 unsigned int insns[2];
64 compat_stack_t stack;
65 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
66 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
67 siginfo_extra_v8plus_t v8plus;
68 /* __siginfo_rwin_t * */u32 rwin_save;
69} __attribute__((aligned(8)));
70
71/* Checks if the fp is valid. We always build signal frames which are
72 * 16-byte aligned, therefore we can always enforce that the restore
73 * frame has that property as well.
74 */
75static bool invalid_frame_pointer(void __user *fp, int fplen)
76{
77 if ((((unsigned long) fp) & 15) ||
78 ((unsigned long)fp) > 0x100000000ULL - fplen)
79 return true;
80 return false;
81}
82
83void do_sigreturn32(struct pt_regs *regs)
84{
85 struct signal_frame32 __user *sf;
86 compat_uptr_t fpu_save;
87 compat_uptr_t rwin_save;
88 unsigned int psr, ufp;
89 unsigned int pc, npc;
90 sigset_t set;
91 compat_sigset_t seta;
92 int err, i;
93
94 /* Always make any pending restarted system calls return -EINTR */
95 current->restart_block.fn = do_no_restart_syscall;
96
97 synchronize_user_stack();
98
99 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
100 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
101
102 /* 1. Make sure we are not getting garbage from the user */
103 if (invalid_frame_pointer(sf, sizeof(*sf)))
104 goto segv;
105
106 if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
107 goto segv;
108
109 if (ufp & 0x7)
110 goto segv;
111
112 if (__get_user(pc, &sf->info.si_regs.pc) ||
113 __get_user(npc, &sf->info.si_regs.npc))
114 goto segv;
115
116 if ((pc | npc) & 3)
117 goto segv;
118
119 if (test_thread_flag(TIF_32BIT)) {
120 pc &= 0xffffffff;
121 npc &= 0xffffffff;
122 }
123 regs->tpc = pc;
124 regs->tnpc = npc;
125
126 /* 2. Restore the state */
127 err = __get_user(regs->y, &sf->info.si_regs.y);
128 err |= __get_user(psr, &sf->info.si_regs.psr);
129
130 for (i = UREG_G1; i <= UREG_I7; i++)
131 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
132 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
133 err |= __get_user(i, &sf->v8plus.g_upper[0]);
134 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
135 unsigned long asi;
136
137 for (i = UREG_G1; i <= UREG_I7; i++)
138 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
139 err |= __get_user(asi, &sf->v8plus.asi);
140 regs->tstate &= ~TSTATE_ASI;
141 regs->tstate |= ((asi & 0xffUL) << 24UL);
142 }
143 }
144
145 /* User can only change condition codes in %tstate. */
146 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
147 regs->tstate |= psr_to_tstate_icc(psr);
148
149 /* Prevent syscall restart. */
150 pt_regs_clear_syscall(regs);
151
152 err |= __get_user(fpu_save, &sf->fpu_save);
153 if (!err && fpu_save)
154 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
155 err |= __get_user(rwin_save, &sf->rwin_save);
156 if (!err && rwin_save) {
157 if (restore_rwin_state(compat_ptr(rwin_save)))
158 goto segv;
159 }
160 err |= __get_user(seta.sig[0], &sf->info.si_mask);
161 err |= copy_from_user(&seta.sig[1], &sf->extramask,
162 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
163 if (err)
164 goto segv;
165
166 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
167 set_current_blocked(&set);
168 return;
169
170segv:
171 force_sig(SIGSEGV);
172}
173
174asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
175{
176 struct rt_signal_frame32 __user *sf;
177 unsigned int psr, pc, npc, ufp;
178 compat_uptr_t fpu_save;
179 compat_uptr_t rwin_save;
180 sigset_t set;
181 int err, i;
182
183 /* Always make any pending restarted system calls return -EINTR */
184 current->restart_block.fn = do_no_restart_syscall;
185
186 synchronize_user_stack();
187 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
188 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
189
190 /* 1. Make sure we are not getting garbage from the user */
191 if (invalid_frame_pointer(sf, sizeof(*sf)))
192 goto segv;
193
194 if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
195 goto segv;
196
197 if (ufp & 0x7)
198 goto segv;
199
200 if (__get_user(pc, &sf->regs.pc) ||
201 __get_user(npc, &sf->regs.npc))
202 goto segv;
203
204 if ((pc | npc) & 3)
205 goto segv;
206
207 if (test_thread_flag(TIF_32BIT)) {
208 pc &= 0xffffffff;
209 npc &= 0xffffffff;
210 }
211 regs->tpc = pc;
212 regs->tnpc = npc;
213
214 /* 2. Restore the state */
215 err = __get_user(regs->y, &sf->regs.y);
216 err |= __get_user(psr, &sf->regs.psr);
217
218 for (i = UREG_G1; i <= UREG_I7; i++)
219 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
220 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
221 err |= __get_user(i, &sf->v8plus.g_upper[0]);
222 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
223 unsigned long asi;
224
225 for (i = UREG_G1; i <= UREG_I7; i++)
226 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
227 err |= __get_user(asi, &sf->v8plus.asi);
228 regs->tstate &= ~TSTATE_ASI;
229 regs->tstate |= ((asi & 0xffUL) << 24UL);
230 }
231 }
232
233 /* User can only change condition codes in %tstate. */
234 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
235 regs->tstate |= psr_to_tstate_icc(psr);
236
237 /* Prevent syscall restart. */
238 pt_regs_clear_syscall(regs);
239
240 err |= __get_user(fpu_save, &sf->fpu_save);
241 if (!err && fpu_save)
242 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
243 err |= get_compat_sigset(&set, &sf->mask);
244 err |= compat_restore_altstack(&sf->stack);
245 if (err)
246 goto segv;
247
248 err |= __get_user(rwin_save, &sf->rwin_save);
249 if (!err && rwin_save) {
250 if (restore_rwin_state(compat_ptr(rwin_save)))
251 goto segv;
252 }
253
254 set_current_blocked(&set);
255 return;
256segv:
257 force_sig(SIGSEGV);
258}
259
260static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
261{
262 unsigned long sp;
263
264 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
265 sp = regs->u_regs[UREG_FP];
266
267 /*
268 * If we are on the alternate signal stack and would overflow it, don't.
269 * Return an always-bogus address instead so we will die with SIGSEGV.
270 */
271 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
272 return (void __user *) -1L;
273
274 /* This is the X/Open sanctioned signal stack switching. */
275 sp = sigsp(sp, ksig) - framesize;
276
277 /* Always align the stack frame. This handles two cases. First,
278 * sigaltstack need not be mindful of platform specific stack
279 * alignment. Second, if we took this signal because the stack
280 * is not aligned properly, we'd like to take the signal cleanly
281 * and report that.
282 */
283 sp &= ~15UL;
284
285 return (void __user *) sp;
286}
287
288/* The I-cache flush instruction only works in the primary ASI, which
289 * right now is the nucleus, aka. kernel space.
290 *
291 * Therefore we have to kick the instructions out using the kernel
292 * side linear mapping of the physical address backing the user
293 * instructions.
294 */
295static void flush_signal_insns(unsigned long address)
296{
297 unsigned long pstate, paddr;
298 pte_t *ptep, pte;
299 pgd_t *pgdp;
300 p4d_t *p4dp;
301 pud_t *pudp;
302 pmd_t *pmdp;
303
304 /* Commit all stores of the instructions we are about to flush. */
305 wmb();
306
307 /* Disable cross-call reception. In this way even a very wide
308 * munmap() on another cpu can't tear down the page table
309 * hierarchy from underneath us, since that can't complete
310 * until the IPI tlb flush returns.
311 */
312
313 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
314 __asm__ __volatile__("wrpr %0, %1, %%pstate"
315 : : "r" (pstate), "i" (PSTATE_IE));
316
317 pgdp = pgd_offset(current->mm, address);
318 if (pgd_none(*pgdp))
319 goto out_irqs_on;
320 p4dp = p4d_offset(pgdp, address);
321 if (p4d_none(*p4dp))
322 goto out_irqs_on;
323 pudp = pud_offset(p4dp, address);
324 if (pud_none(*pudp))
325 goto out_irqs_on;
326 pmdp = pmd_offset(pudp, address);
327 if (pmd_none(*pmdp))
328 goto out_irqs_on;
329
330 ptep = pte_offset_map(pmdp, address);
331 if (!ptep)
332 goto out_irqs_on;
333 pte = *ptep;
334 if (!pte_present(pte))
335 goto out_unmap;
336
337 paddr = (unsigned long) page_address(pte_page(pte));
338
339 __asm__ __volatile__("flush %0 + %1"
340 : /* no outputs */
341 : "r" (paddr),
342 "r" (address & (PAGE_SIZE - 1))
343 : "memory");
344
345out_unmap:
346 pte_unmap(ptep);
347out_irqs_on:
348 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
349
350}
351
352static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
353 sigset_t *oldset)
354{
355 struct signal_frame32 __user *sf;
356 int i, err, wsaved;
357 void __user *tail;
358 int sigframe_size;
359 u32 psr;
360 compat_sigset_t seta;
361
362 /* 1. Make sure everything is clean */
363 synchronize_user_stack();
364 save_and_clear_fpu();
365
366 wsaved = get_thread_wsaved();
367
368 sigframe_size = sizeof(*sf);
369 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
370 sigframe_size += sizeof(__siginfo_fpu_t);
371 if (wsaved)
372 sigframe_size += sizeof(__siginfo_rwin_t);
373
374 sf = (struct signal_frame32 __user *)
375 get_sigframe(ksig, regs, sigframe_size);
376
377 if (invalid_frame_pointer(sf, sigframe_size)) {
378 if (show_unhandled_signals)
379 pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
380 current->comm, current->pid, (unsigned long)sf,
381 regs->tpc, regs->u_regs[UREG_I7]);
382 force_sigsegv(ksig->sig);
383 return -EINVAL;
384 }
385
386 tail = (sf + 1);
387
388 /* 2. Save the current process state */
389 if (test_thread_flag(TIF_32BIT)) {
390 regs->tpc &= 0xffffffff;
391 regs->tnpc &= 0xffffffff;
392 }
393 err = put_user(regs->tpc, &sf->info.si_regs.pc);
394 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
395 err |= __put_user(regs->y, &sf->info.si_regs.y);
396 psr = tstate_to_psr(regs->tstate);
397 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
398 psr |= PSR_EF;
399 err |= __put_user(psr, &sf->info.si_regs.psr);
400 for (i = 0; i < 16; i++)
401 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
402 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
403 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
404 for (i = 1; i < 16; i++)
405 err |= __put_user(((u32 *)regs->u_regs)[2*i],
406 &sf->v8plus.g_upper[i]);
407 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
408 &sf->v8plus.asi);
409
410 if (psr & PSR_EF) {
411 __siginfo_fpu_t __user *fp = tail;
412 tail += sizeof(*fp);
413 err |= save_fpu_state(regs, fp);
414 err |= __put_user((u64)fp, &sf->fpu_save);
415 } else {
416 err |= __put_user(0, &sf->fpu_save);
417 }
418 if (wsaved) {
419 __siginfo_rwin_t __user *rwp = tail;
420 tail += sizeof(*rwp);
421 err |= save_rwin_state(wsaved, rwp);
422 err |= __put_user((u64)rwp, &sf->rwin_save);
423 set_thread_wsaved(0);
424 } else {
425 err |= __put_user(0, &sf->rwin_save);
426 }
427
428 /* If these change we need to know - assignments to seta relies on these sizes */
429 BUILD_BUG_ON(_NSIG_WORDS != 1);
430 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
431 seta.sig[1] = (oldset->sig[0] >> 32);
432 seta.sig[0] = oldset->sig[0];
433
434 err |= __put_user(seta.sig[0], &sf->info.si_mask);
435 err |= __copy_to_user(sf->extramask, &seta.sig[1],
436 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
437
438 if (!wsaved) {
439 err |= raw_copy_in_user((u32 __user *)sf,
440 (u32 __user *)(regs->u_regs[UREG_FP]),
441 sizeof(struct reg_window32));
442 } else {
443 struct reg_window *rp;
444
445 rp = ¤t_thread_info()->reg_window[wsaved - 1];
446 for (i = 0; i < 8; i++)
447 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
448 for (i = 0; i < 6; i++)
449 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
450 err |= __put_user(rp->ins[6], &sf->ss.fp);
451 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
452 }
453 if (err)
454 return err;
455
456 /* 3. signal handler back-trampoline and parameters */
457 regs->u_regs[UREG_FP] = (unsigned long) sf;
458 regs->u_regs[UREG_I0] = ksig->sig;
459 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
460 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
461
462 /* 4. signal handler */
463 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
464 regs->tnpc = (regs->tpc + 4);
465 if (test_thread_flag(TIF_32BIT)) {
466 regs->tpc &= 0xffffffff;
467 regs->tnpc &= 0xffffffff;
468 }
469
470 /* 5. return to kernel instructions */
471 if (ksig->ka.ka_restorer) {
472 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
473 } else {
474 unsigned long address = ((unsigned long)&(sf->insns[0]));
475
476 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
477
478 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
479 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
480 if (err)
481 return err;
482 flush_signal_insns(address);
483 }
484 return 0;
485}
486
487static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
488 sigset_t *oldset)
489{
490 struct rt_signal_frame32 __user *sf;
491 int i, err, wsaved;
492 void __user *tail;
493 int sigframe_size;
494 u32 psr;
495
496 /* 1. Make sure everything is clean */
497 synchronize_user_stack();
498 save_and_clear_fpu();
499
500 wsaved = get_thread_wsaved();
501
502 sigframe_size = sizeof(*sf);
503 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
504 sigframe_size += sizeof(__siginfo_fpu_t);
505 if (wsaved)
506 sigframe_size += sizeof(__siginfo_rwin_t);
507
508 sf = (struct rt_signal_frame32 __user *)
509 get_sigframe(ksig, regs, sigframe_size);
510
511 if (invalid_frame_pointer(sf, sigframe_size)) {
512 if (show_unhandled_signals)
513 pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
514 current->comm, current->pid, (unsigned long)sf,
515 regs->tpc, regs->u_regs[UREG_I7]);
516 force_sigsegv(ksig->sig);
517 return -EINVAL;
518 }
519
520 tail = (sf + 1);
521
522 /* 2. Save the current process state */
523 if (test_thread_flag(TIF_32BIT)) {
524 regs->tpc &= 0xffffffff;
525 regs->tnpc &= 0xffffffff;
526 }
527 err = put_user(regs->tpc, &sf->regs.pc);
528 err |= __put_user(regs->tnpc, &sf->regs.npc);
529 err |= __put_user(regs->y, &sf->regs.y);
530 psr = tstate_to_psr(regs->tstate);
531 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
532 psr |= PSR_EF;
533 err |= __put_user(psr, &sf->regs.psr);
534 for (i = 0; i < 16; i++)
535 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
536 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
537 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
538 for (i = 1; i < 16; i++)
539 err |= __put_user(((u32 *)regs->u_regs)[2*i],
540 &sf->v8plus.g_upper[i]);
541 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
542 &sf->v8plus.asi);
543
544 if (psr & PSR_EF) {
545 __siginfo_fpu_t __user *fp = tail;
546 tail += sizeof(*fp);
547 err |= save_fpu_state(regs, fp);
548 err |= __put_user((u64)fp, &sf->fpu_save);
549 } else {
550 err |= __put_user(0, &sf->fpu_save);
551 }
552 if (wsaved) {
553 __siginfo_rwin_t __user *rwp = tail;
554 tail += sizeof(*rwp);
555 err |= save_rwin_state(wsaved, rwp);
556 err |= __put_user((u64)rwp, &sf->rwin_save);
557 set_thread_wsaved(0);
558 } else {
559 err |= __put_user(0, &sf->rwin_save);
560 }
561
562 /* Update the siginfo structure. */
563 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
564
565 /* Setup sigaltstack */
566 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
567
568 err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t));
569
570 if (!wsaved) {
571 err |= raw_copy_in_user((u32 __user *)sf,
572 (u32 __user *)(regs->u_regs[UREG_FP]),
573 sizeof(struct reg_window32));
574 } else {
575 struct reg_window *rp;
576
577 rp = ¤t_thread_info()->reg_window[wsaved - 1];
578 for (i = 0; i < 8; i++)
579 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
580 for (i = 0; i < 6; i++)
581 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
582 err |= __put_user(rp->ins[6], &sf->ss.fp);
583 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
584 }
585 if (err)
586 return err;
587
588 /* 3. signal handler back-trampoline and parameters */
589 regs->u_regs[UREG_FP] = (unsigned long) sf;
590 regs->u_regs[UREG_I0] = ksig->sig;
591 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
592 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
593
594 /* 4. signal handler */
595 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
596 regs->tnpc = (regs->tpc + 4);
597 if (test_thread_flag(TIF_32BIT)) {
598 regs->tpc &= 0xffffffff;
599 regs->tnpc &= 0xffffffff;
600 }
601
602 /* 5. return to kernel instructions */
603 if (ksig->ka.ka_restorer)
604 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
605 else {
606 unsigned long address = ((unsigned long)&(sf->insns[0]));
607
608 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
609
610 /* mov __NR_rt_sigreturn, %g1 */
611 err |= __put_user(0x82102065, &sf->insns[0]);
612
613 /* t 0x10 */
614 err |= __put_user(0x91d02010, &sf->insns[1]);
615 if (err)
616 return err;
617
618 flush_signal_insns(address);
619 }
620 return 0;
621}
622
623static inline void handle_signal32(struct ksignal *ksig,
624 struct pt_regs *regs)
625{
626 sigset_t *oldset = sigmask_to_save();
627 int err;
628
629 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
630 err = setup_rt_frame32(ksig, regs, oldset);
631 else
632 err = setup_frame32(ksig, regs, oldset);
633
634 signal_setup_done(err, ksig, 0);
635}
636
637static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
638 struct sigaction *sa)
639{
640 switch (regs->u_regs[UREG_I0]) {
641 case ERESTART_RESTARTBLOCK:
642 case ERESTARTNOHAND:
643 no_system_call_restart:
644 regs->u_regs[UREG_I0] = EINTR;
645 regs->tstate |= TSTATE_ICARRY;
646 break;
647 case ERESTARTSYS:
648 if (!(sa->sa_flags & SA_RESTART))
649 goto no_system_call_restart;
650 fallthrough;
651 case ERESTARTNOINTR:
652 regs->u_regs[UREG_I0] = orig_i0;
653 regs->tpc -= 4;
654 regs->tnpc -= 4;
655 }
656}
657
658/* Note that 'init' is a special process: it doesn't get signals it doesn't
659 * want to handle. Thus you cannot kill init even with a SIGKILL even by
660 * mistake.
661 */
662void do_signal32(struct pt_regs * regs)
663{
664 struct ksignal ksig;
665 unsigned long orig_i0 = 0;
666 int restart_syscall = 0;
667 bool has_handler = get_signal(&ksig);
668
669 if (pt_regs_is_syscall(regs) &&
670 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
671 restart_syscall = 1;
672 orig_i0 = regs->u_regs[UREG_G6];
673 }
674
675 if (has_handler) {
676 if (restart_syscall)
677 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
678 handle_signal32(&ksig, regs);
679 } else {
680 if (restart_syscall) {
681 switch (regs->u_regs[UREG_I0]) {
682 case ERESTARTNOHAND:
683 case ERESTARTSYS:
684 case ERESTARTNOINTR:
685 /* replay the system call when we are done */
686 regs->u_regs[UREG_I0] = orig_i0;
687 regs->tpc -= 4;
688 regs->tnpc -= 4;
689 pt_regs_clear_syscall(regs);
690 fallthrough;
691 case ERESTART_RESTARTBLOCK:
692 regs->u_regs[UREG_G1] = __NR_restart_syscall;
693 regs->tpc -= 4;
694 regs->tnpc -= 4;
695 pt_regs_clear_syscall(regs);
696 }
697 }
698 restore_saved_sigmask();
699 }
700}
701
702struct sigstack32 {
703 u32 the_stack;
704 int cur_status;
705};
706
707asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
708{
709 struct sigstack32 __user *ssptr =
710 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
711 struct sigstack32 __user *ossptr =
712 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
713 int ret = -EFAULT;
714
715 /* First see if old state is wanted. */
716 if (ossptr) {
717 if (put_user(current->sas_ss_sp + current->sas_ss_size,
718 &ossptr->the_stack) ||
719 __put_user(on_sig_stack(sp), &ossptr->cur_status))
720 goto out;
721 }
722
723 /* Now see if we want to update the new state. */
724 if (ssptr) {
725 u32 ss_sp;
726
727 if (get_user(ss_sp, &ssptr->the_stack))
728 goto out;
729
730 /* If the current stack was set with sigaltstack, don't
731 * swap stacks while we are on it.
732 */
733 ret = -EPERM;
734 if (current->sas_ss_sp && on_sig_stack(sp))
735 goto out;
736
737 /* Since we don't know the extent of the stack, and we don't
738 * track onstack-ness, but rather calculate it, we must
739 * presume a size. Ho hum this interface is lossy.
740 */
741 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
742 current->sas_ss_size = SIGSTKSZ;
743 }
744
745 ret = 0;
746out:
747 return ret;
748}
749
750/*
751 * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as
752 * changes likely come with new fields that should be added below.
753 */
754static_assert(NSIGILL == 11);
755static_assert(NSIGFPE == 15);
756static_assert(NSIGSEGV == 10);
757static_assert(NSIGBUS == 5);
758static_assert(NSIGTRAP == 6);
759static_assert(NSIGCHLD == 6);
760static_assert(NSIGSYS == 2);
761static_assert(sizeof(compat_siginfo_t) == 128);
762static_assert(__alignof__(compat_siginfo_t) == 4);
763static_assert(offsetof(compat_siginfo_t, si_signo) == 0x00);
764static_assert(offsetof(compat_siginfo_t, si_errno) == 0x04);
765static_assert(offsetof(compat_siginfo_t, si_code) == 0x08);
766static_assert(offsetof(compat_siginfo_t, si_pid) == 0x0c);
767static_assert(offsetof(compat_siginfo_t, si_uid) == 0x10);
768static_assert(offsetof(compat_siginfo_t, si_tid) == 0x0c);
769static_assert(offsetof(compat_siginfo_t, si_overrun) == 0x10);
770static_assert(offsetof(compat_siginfo_t, si_status) == 0x14);
771static_assert(offsetof(compat_siginfo_t, si_utime) == 0x18);
772static_assert(offsetof(compat_siginfo_t, si_stime) == 0x1c);
773static_assert(offsetof(compat_siginfo_t, si_value) == 0x14);
774static_assert(offsetof(compat_siginfo_t, si_int) == 0x14);
775static_assert(offsetof(compat_siginfo_t, si_ptr) == 0x14);
776static_assert(offsetof(compat_siginfo_t, si_addr) == 0x0c);
777static_assert(offsetof(compat_siginfo_t, si_trapno) == 0x10);
778static_assert(offsetof(compat_siginfo_t, si_addr_lsb) == 0x10);
779static_assert(offsetof(compat_siginfo_t, si_lower) == 0x14);
780static_assert(offsetof(compat_siginfo_t, si_upper) == 0x18);
781static_assert(offsetof(compat_siginfo_t, si_pkey) == 0x14);
782static_assert(offsetof(compat_siginfo_t, si_perf_data) == 0x10);
783static_assert(offsetof(compat_siginfo_t, si_perf_type) == 0x14);
784static_assert(offsetof(compat_siginfo_t, si_perf_flags) == 0x18);
785static_assert(offsetof(compat_siginfo_t, si_band) == 0x0c);
786static_assert(offsetof(compat_siginfo_t, si_fd) == 0x10);