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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
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 pte = *ptep;
332 if (!pte_present(pte))
333 goto out_unmap;
334
335 paddr = (unsigned long) page_address(pte_page(pte));
336
337 __asm__ __volatile__("flush %0 + %1"
338 : /* no outputs */
339 : "r" (paddr),
340 "r" (address & (PAGE_SIZE - 1))
341 : "memory");
342
343out_unmap:
344 pte_unmap(ptep);
345out_irqs_on:
346 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
347
348}
349
350static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
351 sigset_t *oldset)
352{
353 struct signal_frame32 __user *sf;
354 int i, err, wsaved;
355 void __user *tail;
356 int sigframe_size;
357 u32 psr;
358 compat_sigset_t seta;
359
360 /* 1. Make sure everything is clean */
361 synchronize_user_stack();
362 save_and_clear_fpu();
363
364 wsaved = get_thread_wsaved();
365
366 sigframe_size = sizeof(*sf);
367 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
368 sigframe_size += sizeof(__siginfo_fpu_t);
369 if (wsaved)
370 sigframe_size += sizeof(__siginfo_rwin_t);
371
372 sf = (struct signal_frame32 __user *)
373 get_sigframe(ksig, regs, sigframe_size);
374
375 if (invalid_frame_pointer(sf, sigframe_size)) {
376 if (show_unhandled_signals)
377 pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
378 current->comm, current->pid, (unsigned long)sf,
379 regs->tpc, regs->u_regs[UREG_I7]);
380 force_sigsegv(ksig->sig);
381 return -EINVAL;
382 }
383
384 tail = (sf + 1);
385
386 /* 2. Save the current process state */
387 if (test_thread_flag(TIF_32BIT)) {
388 regs->tpc &= 0xffffffff;
389 regs->tnpc &= 0xffffffff;
390 }
391 err = put_user(regs->tpc, &sf->info.si_regs.pc);
392 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
393 err |= __put_user(regs->y, &sf->info.si_regs.y);
394 psr = tstate_to_psr(regs->tstate);
395 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
396 psr |= PSR_EF;
397 err |= __put_user(psr, &sf->info.si_regs.psr);
398 for (i = 0; i < 16; i++)
399 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
400 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
401 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
402 for (i = 1; i < 16; i++)
403 err |= __put_user(((u32 *)regs->u_regs)[2*i],
404 &sf->v8plus.g_upper[i]);
405 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
406 &sf->v8plus.asi);
407
408 if (psr & PSR_EF) {
409 __siginfo_fpu_t __user *fp = tail;
410 tail += sizeof(*fp);
411 err |= save_fpu_state(regs, fp);
412 err |= __put_user((u64)fp, &sf->fpu_save);
413 } else {
414 err |= __put_user(0, &sf->fpu_save);
415 }
416 if (wsaved) {
417 __siginfo_rwin_t __user *rwp = tail;
418 tail += sizeof(*rwp);
419 err |= save_rwin_state(wsaved, rwp);
420 err |= __put_user((u64)rwp, &sf->rwin_save);
421 set_thread_wsaved(0);
422 } else {
423 err |= __put_user(0, &sf->rwin_save);
424 }
425
426 /* If these change we need to know - assignments to seta relies on these sizes */
427 BUILD_BUG_ON(_NSIG_WORDS != 1);
428 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
429 seta.sig[1] = (oldset->sig[0] >> 32);
430 seta.sig[0] = oldset->sig[0];
431
432 err |= __put_user(seta.sig[0], &sf->info.si_mask);
433 err |= __copy_to_user(sf->extramask, &seta.sig[1],
434 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
435
436 if (!wsaved) {
437 err |= raw_copy_in_user((u32 __user *)sf,
438 (u32 __user *)(regs->u_regs[UREG_FP]),
439 sizeof(struct reg_window32));
440 } else {
441 struct reg_window *rp;
442
443 rp = ¤t_thread_info()->reg_window[wsaved - 1];
444 for (i = 0; i < 8; i++)
445 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
446 for (i = 0; i < 6; i++)
447 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
448 err |= __put_user(rp->ins[6], &sf->ss.fp);
449 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
450 }
451 if (err)
452 return err;
453
454 /* 3. signal handler back-trampoline and parameters */
455 regs->u_regs[UREG_FP] = (unsigned long) sf;
456 regs->u_regs[UREG_I0] = ksig->sig;
457 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
458 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
459
460 /* 4. signal handler */
461 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
462 regs->tnpc = (regs->tpc + 4);
463 if (test_thread_flag(TIF_32BIT)) {
464 regs->tpc &= 0xffffffff;
465 regs->tnpc &= 0xffffffff;
466 }
467
468 /* 5. return to kernel instructions */
469 if (ksig->ka.ka_restorer) {
470 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
471 } else {
472 unsigned long address = ((unsigned long)&(sf->insns[0]));
473
474 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
475
476 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
477 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
478 if (err)
479 return err;
480 flush_signal_insns(address);
481 }
482 return 0;
483}
484
485static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
486 sigset_t *oldset)
487{
488 struct rt_signal_frame32 __user *sf;
489 int i, err, wsaved;
490 void __user *tail;
491 int sigframe_size;
492 u32 psr;
493
494 /* 1. Make sure everything is clean */
495 synchronize_user_stack();
496 save_and_clear_fpu();
497
498 wsaved = get_thread_wsaved();
499
500 sigframe_size = sizeof(*sf);
501 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
502 sigframe_size += sizeof(__siginfo_fpu_t);
503 if (wsaved)
504 sigframe_size += sizeof(__siginfo_rwin_t);
505
506 sf = (struct rt_signal_frame32 __user *)
507 get_sigframe(ksig, regs, sigframe_size);
508
509 if (invalid_frame_pointer(sf, sigframe_size)) {
510 if (show_unhandled_signals)
511 pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
512 current->comm, current->pid, (unsigned long)sf,
513 regs->tpc, regs->u_regs[UREG_I7]);
514 force_sigsegv(ksig->sig);
515 return -EINVAL;
516 }
517
518 tail = (sf + 1);
519
520 /* 2. Save the current process state */
521 if (test_thread_flag(TIF_32BIT)) {
522 regs->tpc &= 0xffffffff;
523 regs->tnpc &= 0xffffffff;
524 }
525 err = put_user(regs->tpc, &sf->regs.pc);
526 err |= __put_user(regs->tnpc, &sf->regs.npc);
527 err |= __put_user(regs->y, &sf->regs.y);
528 psr = tstate_to_psr(regs->tstate);
529 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
530 psr |= PSR_EF;
531 err |= __put_user(psr, &sf->regs.psr);
532 for (i = 0; i < 16; i++)
533 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
534 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
535 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
536 for (i = 1; i < 16; i++)
537 err |= __put_user(((u32 *)regs->u_regs)[2*i],
538 &sf->v8plus.g_upper[i]);
539 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
540 &sf->v8plus.asi);
541
542 if (psr & PSR_EF) {
543 __siginfo_fpu_t __user *fp = tail;
544 tail += sizeof(*fp);
545 err |= save_fpu_state(regs, fp);
546 err |= __put_user((u64)fp, &sf->fpu_save);
547 } else {
548 err |= __put_user(0, &sf->fpu_save);
549 }
550 if (wsaved) {
551 __siginfo_rwin_t __user *rwp = tail;
552 tail += sizeof(*rwp);
553 err |= save_rwin_state(wsaved, rwp);
554 err |= __put_user((u64)rwp, &sf->rwin_save);
555 set_thread_wsaved(0);
556 } else {
557 err |= __put_user(0, &sf->rwin_save);
558 }
559
560 /* Update the siginfo structure. */
561 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
562
563 /* Setup sigaltstack */
564 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
565
566 err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t));
567
568 if (!wsaved) {
569 err |= raw_copy_in_user((u32 __user *)sf,
570 (u32 __user *)(regs->u_regs[UREG_FP]),
571 sizeof(struct reg_window32));
572 } else {
573 struct reg_window *rp;
574
575 rp = ¤t_thread_info()->reg_window[wsaved - 1];
576 for (i = 0; i < 8; i++)
577 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
578 for (i = 0; i < 6; i++)
579 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
580 err |= __put_user(rp->ins[6], &sf->ss.fp);
581 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
582 }
583 if (err)
584 return err;
585
586 /* 3. signal handler back-trampoline and parameters */
587 regs->u_regs[UREG_FP] = (unsigned long) sf;
588 regs->u_regs[UREG_I0] = ksig->sig;
589 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
590 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
591
592 /* 4. signal handler */
593 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
594 regs->tnpc = (regs->tpc + 4);
595 if (test_thread_flag(TIF_32BIT)) {
596 regs->tpc &= 0xffffffff;
597 regs->tnpc &= 0xffffffff;
598 }
599
600 /* 5. return to kernel instructions */
601 if (ksig->ka.ka_restorer)
602 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
603 else {
604 unsigned long address = ((unsigned long)&(sf->insns[0]));
605
606 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
607
608 /* mov __NR_rt_sigreturn, %g1 */
609 err |= __put_user(0x82102065, &sf->insns[0]);
610
611 /* t 0x10 */
612 err |= __put_user(0x91d02010, &sf->insns[1]);
613 if (err)
614 return err;
615
616 flush_signal_insns(address);
617 }
618 return 0;
619}
620
621static inline void handle_signal32(struct ksignal *ksig,
622 struct pt_regs *regs)
623{
624 sigset_t *oldset = sigmask_to_save();
625 int err;
626
627 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
628 err = setup_rt_frame32(ksig, regs, oldset);
629 else
630 err = setup_frame32(ksig, regs, oldset);
631
632 signal_setup_done(err, ksig, 0);
633}
634
635static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
636 struct sigaction *sa)
637{
638 switch (regs->u_regs[UREG_I0]) {
639 case ERESTART_RESTARTBLOCK:
640 case ERESTARTNOHAND:
641 no_system_call_restart:
642 regs->u_regs[UREG_I0] = EINTR;
643 regs->tstate |= TSTATE_ICARRY;
644 break;
645 case ERESTARTSYS:
646 if (!(sa->sa_flags & SA_RESTART))
647 goto no_system_call_restart;
648 fallthrough;
649 case ERESTARTNOINTR:
650 regs->u_regs[UREG_I0] = orig_i0;
651 regs->tpc -= 4;
652 regs->tnpc -= 4;
653 }
654}
655
656/* Note that 'init' is a special process: it doesn't get signals it doesn't
657 * want to handle. Thus you cannot kill init even with a SIGKILL even by
658 * mistake.
659 */
660void do_signal32(struct pt_regs * regs)
661{
662 struct ksignal ksig;
663 unsigned long orig_i0 = 0;
664 int restart_syscall = 0;
665 bool has_handler = get_signal(&ksig);
666
667 if (pt_regs_is_syscall(regs) &&
668 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
669 restart_syscall = 1;
670 orig_i0 = regs->u_regs[UREG_G6];
671 }
672
673 if (has_handler) {
674 if (restart_syscall)
675 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
676 handle_signal32(&ksig, regs);
677 } else {
678 if (restart_syscall) {
679 switch (regs->u_regs[UREG_I0]) {
680 case ERESTARTNOHAND:
681 case ERESTARTSYS:
682 case ERESTARTNOINTR:
683 /* replay the system call when we are done */
684 regs->u_regs[UREG_I0] = orig_i0;
685 regs->tpc -= 4;
686 regs->tnpc -= 4;
687 pt_regs_clear_syscall(regs);
688 fallthrough;
689 case ERESTART_RESTARTBLOCK:
690 regs->u_regs[UREG_G1] = __NR_restart_syscall;
691 regs->tpc -= 4;
692 regs->tnpc -= 4;
693 pt_regs_clear_syscall(regs);
694 }
695 }
696 restore_saved_sigmask();
697 }
698}
699
700struct sigstack32 {
701 u32 the_stack;
702 int cur_status;
703};
704
705asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
706{
707 struct sigstack32 __user *ssptr =
708 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
709 struct sigstack32 __user *ossptr =
710 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
711 int ret = -EFAULT;
712
713 /* First see if old state is wanted. */
714 if (ossptr) {
715 if (put_user(current->sas_ss_sp + current->sas_ss_size,
716 &ossptr->the_stack) ||
717 __put_user(on_sig_stack(sp), &ossptr->cur_status))
718 goto out;
719 }
720
721 /* Now see if we want to update the new state. */
722 if (ssptr) {
723 u32 ss_sp;
724
725 if (get_user(ss_sp, &ssptr->the_stack))
726 goto out;
727
728 /* If the current stack was set with sigaltstack, don't
729 * swap stacks while we are on it.
730 */
731 ret = -EPERM;
732 if (current->sas_ss_sp && on_sig_stack(sp))
733 goto out;
734
735 /* Since we don't know the extent of the stack, and we don't
736 * track onstack-ness, but rather calculate it, we must
737 * presume a size. Ho hum this interface is lossy.
738 */
739 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
740 current->sas_ss_size = SIGSTKSZ;
741 }
742
743 ret = 0;
744out:
745 return ret;
746}
747
748/*
749 * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as
750 * changes likely come with new fields that should be added below.
751 */
752static_assert(NSIGILL == 11);
753static_assert(NSIGFPE == 15);
754static_assert(NSIGSEGV == 9);
755static_assert(NSIGBUS == 5);
756static_assert(NSIGTRAP == 6);
757static_assert(NSIGCHLD == 6);
758static_assert(NSIGSYS == 2);
759static_assert(sizeof(compat_siginfo_t) == 128);
760static_assert(__alignof__(compat_siginfo_t) == 4);
761static_assert(offsetof(compat_siginfo_t, si_signo) == 0x00);
762static_assert(offsetof(compat_siginfo_t, si_errno) == 0x04);
763static_assert(offsetof(compat_siginfo_t, si_code) == 0x08);
764static_assert(offsetof(compat_siginfo_t, si_pid) == 0x0c);
765static_assert(offsetof(compat_siginfo_t, si_uid) == 0x10);
766static_assert(offsetof(compat_siginfo_t, si_tid) == 0x0c);
767static_assert(offsetof(compat_siginfo_t, si_overrun) == 0x10);
768static_assert(offsetof(compat_siginfo_t, si_status) == 0x14);
769static_assert(offsetof(compat_siginfo_t, si_utime) == 0x18);
770static_assert(offsetof(compat_siginfo_t, si_stime) == 0x1c);
771static_assert(offsetof(compat_siginfo_t, si_value) == 0x14);
772static_assert(offsetof(compat_siginfo_t, si_int) == 0x14);
773static_assert(offsetof(compat_siginfo_t, si_ptr) == 0x14);
774static_assert(offsetof(compat_siginfo_t, si_addr) == 0x0c);
775static_assert(offsetof(compat_siginfo_t, si_trapno) == 0x10);
776static_assert(offsetof(compat_siginfo_t, si_addr_lsb) == 0x10);
777static_assert(offsetof(compat_siginfo_t, si_lower) == 0x14);
778static_assert(offsetof(compat_siginfo_t, si_upper) == 0x18);
779static_assert(offsetof(compat_siginfo_t, si_pkey) == 0x14);
780static_assert(offsetof(compat_siginfo_t, si_perf_data) == 0x10);
781static_assert(offsetof(compat_siginfo_t, si_perf_type) == 0x14);
782static_assert(offsetof(compat_siginfo_t, si_perf_flags) == 0x18);
783static_assert(offsetof(compat_siginfo_t, si_band) == 0x0c);
784static_assert(offsetof(compat_siginfo_t, si_fd) == 0x10);
1// SPDX-License-Identifier: GPL-2.0
2/* arch/sparc64/kernel/signal32.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11#include <linux/sched.h>
12#include <linux/kernel.h>
13#include <linux/signal.h>
14#include <linux/errno.h>
15#include <linux/wait.h>
16#include <linux/ptrace.h>
17#include <linux/unistd.h>
18#include <linux/mm.h>
19#include <linux/tty.h>
20#include <linux/binfmts.h>
21#include <linux/compat.h>
22#include <linux/bitops.h>
23#include <linux/tracehook.h>
24
25#include <linux/uaccess.h>
26#include <asm/ptrace.h>
27#include <asm/psrcompat.h>
28#include <asm/fpumacro.h>
29#include <asm/visasm.h>
30#include <asm/compat_signal.h>
31#include <asm/switch_to.h>
32
33#include "sigutil.h"
34#include "kernel.h"
35
36/* This magic should be in g_upper[0] for all upper parts
37 * to be valid.
38 */
39#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
40typedef struct {
41 unsigned int g_upper[8];
42 unsigned int o_upper[8];
43 unsigned int asi;
44} siginfo_extra_v8plus_t;
45
46struct signal_frame32 {
47 struct sparc_stackf32 ss;
48 __siginfo32_t info;
49 /* __siginfo_fpu_t * */ u32 fpu_save;
50 unsigned int insns[2];
51 unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
52 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
53 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
54 siginfo_extra_v8plus_t v8plus;
55 /* __siginfo_rwin_t * */u32 rwin_save;
56} __attribute__((aligned(8)));
57
58struct rt_signal_frame32 {
59 struct sparc_stackf32 ss;
60 compat_siginfo_t info;
61 struct pt_regs32 regs;
62 compat_sigset_t mask;
63 /* __siginfo_fpu_t * */ u32 fpu_save;
64 unsigned int insns[2];
65 compat_stack_t stack;
66 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
67 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
68 siginfo_extra_v8plus_t v8plus;
69 /* __siginfo_rwin_t * */u32 rwin_save;
70} __attribute__((aligned(8)));
71
72/* Checks if the fp is valid. We always build signal frames which are
73 * 16-byte aligned, therefore we can always enforce that the restore
74 * frame has that property as well.
75 */
76static bool invalid_frame_pointer(void __user *fp, int fplen)
77{
78 if ((((unsigned long) fp) & 15) ||
79 ((unsigned long)fp) > 0x100000000ULL - fplen)
80 return true;
81 return false;
82}
83
84void do_sigreturn32(struct pt_regs *regs)
85{
86 struct signal_frame32 __user *sf;
87 compat_uptr_t fpu_save;
88 compat_uptr_t rwin_save;
89 unsigned int psr, ufp;
90 unsigned int pc, npc;
91 sigset_t set;
92 compat_sigset_t seta;
93 int err, i;
94
95 /* Always make any pending restarted system calls return -EINTR */
96 current->restart_block.fn = do_no_restart_syscall;
97
98 synchronize_user_stack();
99
100 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
101 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
102
103 /* 1. Make sure we are not getting garbage from the user */
104 if (invalid_frame_pointer(sf, sizeof(*sf)))
105 goto segv;
106
107 if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
108 goto segv;
109
110 if (ufp & 0x7)
111 goto segv;
112
113 if (__get_user(pc, &sf->info.si_regs.pc) ||
114 __get_user(npc, &sf->info.si_regs.npc))
115 goto segv;
116
117 if ((pc | npc) & 3)
118 goto segv;
119
120 if (test_thread_flag(TIF_32BIT)) {
121 pc &= 0xffffffff;
122 npc &= 0xffffffff;
123 }
124 regs->tpc = pc;
125 regs->tnpc = npc;
126
127 /* 2. Restore the state */
128 err = __get_user(regs->y, &sf->info.si_regs.y);
129 err |= __get_user(psr, &sf->info.si_regs.psr);
130
131 for (i = UREG_G1; i <= UREG_I7; i++)
132 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
133 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
134 err |= __get_user(i, &sf->v8plus.g_upper[0]);
135 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
136 unsigned long asi;
137
138 for (i = UREG_G1; i <= UREG_I7; i++)
139 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
140 err |= __get_user(asi, &sf->v8plus.asi);
141 regs->tstate &= ~TSTATE_ASI;
142 regs->tstate |= ((asi & 0xffUL) << 24UL);
143 }
144 }
145
146 /* User can only change condition codes in %tstate. */
147 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
148 regs->tstate |= psr_to_tstate_icc(psr);
149
150 /* Prevent syscall restart. */
151 pt_regs_clear_syscall(regs);
152
153 err |= __get_user(fpu_save, &sf->fpu_save);
154 if (!err && fpu_save)
155 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
156 err |= __get_user(rwin_save, &sf->rwin_save);
157 if (!err && rwin_save) {
158 if (restore_rwin_state(compat_ptr(rwin_save)))
159 goto segv;
160 }
161 err |= __get_user(seta.sig[0], &sf->info.si_mask);
162 err |= copy_from_user(&seta.sig[1], &sf->extramask,
163 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
164 if (err)
165 goto segv;
166
167 set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
168 set_current_blocked(&set);
169 return;
170
171segv:
172 force_sig(SIGSEGV);
173}
174
175asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
176{
177 struct rt_signal_frame32 __user *sf;
178 unsigned int psr, pc, npc, ufp;
179 compat_uptr_t fpu_save;
180 compat_uptr_t rwin_save;
181 sigset_t set;
182 int err, i;
183
184 /* Always make any pending restarted system calls return -EINTR */
185 current->restart_block.fn = do_no_restart_syscall;
186
187 synchronize_user_stack();
188 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
189 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
190
191 /* 1. Make sure we are not getting garbage from the user */
192 if (invalid_frame_pointer(sf, sizeof(*sf)))
193 goto segv;
194
195 if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
196 goto segv;
197
198 if (ufp & 0x7)
199 goto segv;
200
201 if (__get_user(pc, &sf->regs.pc) ||
202 __get_user(npc, &sf->regs.npc))
203 goto segv;
204
205 if ((pc | npc) & 3)
206 goto segv;
207
208 if (test_thread_flag(TIF_32BIT)) {
209 pc &= 0xffffffff;
210 npc &= 0xffffffff;
211 }
212 regs->tpc = pc;
213 regs->tnpc = npc;
214
215 /* 2. Restore the state */
216 err = __get_user(regs->y, &sf->regs.y);
217 err |= __get_user(psr, &sf->regs.psr);
218
219 for (i = UREG_G1; i <= UREG_I7; i++)
220 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
221 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
222 err |= __get_user(i, &sf->v8plus.g_upper[0]);
223 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
224 unsigned long asi;
225
226 for (i = UREG_G1; i <= UREG_I7; i++)
227 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
228 err |= __get_user(asi, &sf->v8plus.asi);
229 regs->tstate &= ~TSTATE_ASI;
230 regs->tstate |= ((asi & 0xffUL) << 24UL);
231 }
232 }
233
234 /* User can only change condition codes in %tstate. */
235 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
236 regs->tstate |= psr_to_tstate_icc(psr);
237
238 /* Prevent syscall restart. */
239 pt_regs_clear_syscall(regs);
240
241 err |= __get_user(fpu_save, &sf->fpu_save);
242 if (!err && fpu_save)
243 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
244 err |= get_compat_sigset(&set, &sf->mask);
245 err |= compat_restore_altstack(&sf->stack);
246 if (err)
247 goto segv;
248
249 err |= __get_user(rwin_save, &sf->rwin_save);
250 if (!err && rwin_save) {
251 if (restore_rwin_state(compat_ptr(rwin_save)))
252 goto segv;
253 }
254
255 set_current_blocked(&set);
256 return;
257segv:
258 force_sig(SIGSEGV);
259}
260
261static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
262{
263 unsigned long sp;
264
265 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
266 sp = regs->u_regs[UREG_FP];
267
268 /*
269 * If we are on the alternate signal stack and would overflow it, don't.
270 * Return an always-bogus address instead so we will die with SIGSEGV.
271 */
272 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
273 return (void __user *) -1L;
274
275 /* This is the X/Open sanctioned signal stack switching. */
276 sp = sigsp(sp, ksig) - framesize;
277
278 /* Always align the stack frame. This handles two cases. First,
279 * sigaltstack need not be mindful of platform specific stack
280 * alignment. Second, if we took this signal because the stack
281 * is not aligned properly, we'd like to take the signal cleanly
282 * and report that.
283 */
284 sp &= ~15UL;
285
286 return (void __user *) sp;
287}
288
289/* The I-cache flush instruction only works in the primary ASI, which
290 * right now is the nucleus, aka. kernel space.
291 *
292 * Therefore we have to kick the instructions out using the kernel
293 * side linear mapping of the physical address backing the user
294 * instructions.
295 */
296static void flush_signal_insns(unsigned long address)
297{
298 unsigned long pstate, paddr;
299 pte_t *ptep, pte;
300 pgd_t *pgdp;
301 p4d_t *p4dp;
302 pud_t *pudp;
303 pmd_t *pmdp;
304
305 /* Commit all stores of the instructions we are about to flush. */
306 wmb();
307
308 /* Disable cross-call reception. In this way even a very wide
309 * munmap() on another cpu can't tear down the page table
310 * hierarchy from underneath us, since that can't complete
311 * until the IPI tlb flush returns.
312 */
313
314 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
315 __asm__ __volatile__("wrpr %0, %1, %%pstate"
316 : : "r" (pstate), "i" (PSTATE_IE));
317
318 pgdp = pgd_offset(current->mm, address);
319 if (pgd_none(*pgdp))
320 goto out_irqs_on;
321 p4dp = p4d_offset(pgdp, address);
322 if (p4d_none(*p4dp))
323 goto out_irqs_on;
324 pudp = pud_offset(p4dp, address);
325 if (pud_none(*pudp))
326 goto out_irqs_on;
327 pmdp = pmd_offset(pudp, address);
328 if (pmd_none(*pmdp))
329 goto out_irqs_on;
330
331 ptep = pte_offset_map(pmdp, address);
332 pte = *ptep;
333 if (!pte_present(pte))
334 goto out_unmap;
335
336 paddr = (unsigned long) page_address(pte_page(pte));
337
338 __asm__ __volatile__("flush %0 + %1"
339 : /* no outputs */
340 : "r" (paddr),
341 "r" (address & (PAGE_SIZE - 1))
342 : "memory");
343
344out_unmap:
345 pte_unmap(ptep);
346out_irqs_on:
347 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
348
349}
350
351static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
352 sigset_t *oldset)
353{
354 struct signal_frame32 __user *sf;
355 int i, err, wsaved;
356 void __user *tail;
357 int sigframe_size;
358 u32 psr;
359 compat_sigset_t seta;
360
361 /* 1. Make sure everything is clean */
362 synchronize_user_stack();
363 save_and_clear_fpu();
364
365 wsaved = get_thread_wsaved();
366
367 sigframe_size = sizeof(*sf);
368 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
369 sigframe_size += sizeof(__siginfo_fpu_t);
370 if (wsaved)
371 sigframe_size += sizeof(__siginfo_rwin_t);
372
373 sf = (struct signal_frame32 __user *)
374 get_sigframe(ksig, regs, sigframe_size);
375
376 if (invalid_frame_pointer(sf, sigframe_size)) {
377 if (show_unhandled_signals)
378 pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
379 current->comm, current->pid, (unsigned long)sf,
380 regs->tpc, regs->u_regs[UREG_I7]);
381 force_sigsegv(ksig->sig);
382 return -EINVAL;
383 }
384
385 tail = (sf + 1);
386
387 /* 2. Save the current process state */
388 if (test_thread_flag(TIF_32BIT)) {
389 regs->tpc &= 0xffffffff;
390 regs->tnpc &= 0xffffffff;
391 }
392 err = put_user(regs->tpc, &sf->info.si_regs.pc);
393 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
394 err |= __put_user(regs->y, &sf->info.si_regs.y);
395 psr = tstate_to_psr(regs->tstate);
396 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
397 psr |= PSR_EF;
398 err |= __put_user(psr, &sf->info.si_regs.psr);
399 for (i = 0; i < 16; i++)
400 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
401 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
402 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
403 for (i = 1; i < 16; i++)
404 err |= __put_user(((u32 *)regs->u_regs)[2*i],
405 &sf->v8plus.g_upper[i]);
406 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
407 &sf->v8plus.asi);
408
409 if (psr & PSR_EF) {
410 __siginfo_fpu_t __user *fp = tail;
411 tail += sizeof(*fp);
412 err |= save_fpu_state(regs, fp);
413 err |= __put_user((u64)fp, &sf->fpu_save);
414 } else {
415 err |= __put_user(0, &sf->fpu_save);
416 }
417 if (wsaved) {
418 __siginfo_rwin_t __user *rwp = tail;
419 tail += sizeof(*rwp);
420 err |= save_rwin_state(wsaved, rwp);
421 err |= __put_user((u64)rwp, &sf->rwin_save);
422 set_thread_wsaved(0);
423 } else {
424 err |= __put_user(0, &sf->rwin_save);
425 }
426
427 /* If these change we need to know - assignments to seta relies on these sizes */
428 BUILD_BUG_ON(_NSIG_WORDS != 1);
429 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
430 seta.sig[1] = (oldset->sig[0] >> 32);
431 seta.sig[0] = oldset->sig[0];
432
433 err |= __put_user(seta.sig[0], &sf->info.si_mask);
434 err |= __copy_to_user(sf->extramask, &seta.sig[1],
435 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
436
437 if (!wsaved) {
438 err |= copy_in_user((u32 __user *)sf,
439 (u32 __user *)(regs->u_regs[UREG_FP]),
440 sizeof(struct reg_window32));
441 } else {
442 struct reg_window *rp;
443
444 rp = ¤t_thread_info()->reg_window[wsaved - 1];
445 for (i = 0; i < 8; i++)
446 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
447 for (i = 0; i < 6; i++)
448 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
449 err |= __put_user(rp->ins[6], &sf->ss.fp);
450 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
451 }
452 if (err)
453 return err;
454
455 /* 3. signal handler back-trampoline and parameters */
456 regs->u_regs[UREG_FP] = (unsigned long) sf;
457 regs->u_regs[UREG_I0] = ksig->sig;
458 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
459 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
460
461 /* 4. signal handler */
462 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
463 regs->tnpc = (regs->tpc + 4);
464 if (test_thread_flag(TIF_32BIT)) {
465 regs->tpc &= 0xffffffff;
466 regs->tnpc &= 0xffffffff;
467 }
468
469 /* 5. return to kernel instructions */
470 if (ksig->ka.ka_restorer) {
471 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
472 } else {
473 unsigned long address = ((unsigned long)&(sf->insns[0]));
474
475 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
476
477 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
478 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
479 if (err)
480 return err;
481 flush_signal_insns(address);
482 }
483 return 0;
484}
485
486static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
487 sigset_t *oldset)
488{
489 struct rt_signal_frame32 __user *sf;
490 int i, err, wsaved;
491 void __user *tail;
492 int sigframe_size;
493 u32 psr;
494
495 /* 1. Make sure everything is clean */
496 synchronize_user_stack();
497 save_and_clear_fpu();
498
499 wsaved = get_thread_wsaved();
500
501 sigframe_size = sizeof(*sf);
502 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
503 sigframe_size += sizeof(__siginfo_fpu_t);
504 if (wsaved)
505 sigframe_size += sizeof(__siginfo_rwin_t);
506
507 sf = (struct rt_signal_frame32 __user *)
508 get_sigframe(ksig, regs, sigframe_size);
509
510 if (invalid_frame_pointer(sf, sigframe_size)) {
511 if (show_unhandled_signals)
512 pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
513 current->comm, current->pid, (unsigned long)sf,
514 regs->tpc, regs->u_regs[UREG_I7]);
515 force_sigsegv(ksig->sig);
516 return -EINVAL;
517 }
518
519 tail = (sf + 1);
520
521 /* 2. Save the current process state */
522 if (test_thread_flag(TIF_32BIT)) {
523 regs->tpc &= 0xffffffff;
524 regs->tnpc &= 0xffffffff;
525 }
526 err = put_user(regs->tpc, &sf->regs.pc);
527 err |= __put_user(regs->tnpc, &sf->regs.npc);
528 err |= __put_user(regs->y, &sf->regs.y);
529 psr = tstate_to_psr(regs->tstate);
530 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
531 psr |= PSR_EF;
532 err |= __put_user(psr, &sf->regs.psr);
533 for (i = 0; i < 16; i++)
534 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
535 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
536 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
537 for (i = 1; i < 16; i++)
538 err |= __put_user(((u32 *)regs->u_regs)[2*i],
539 &sf->v8plus.g_upper[i]);
540 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
541 &sf->v8plus.asi);
542
543 if (psr & PSR_EF) {
544 __siginfo_fpu_t __user *fp = tail;
545 tail += sizeof(*fp);
546 err |= save_fpu_state(regs, fp);
547 err |= __put_user((u64)fp, &sf->fpu_save);
548 } else {
549 err |= __put_user(0, &sf->fpu_save);
550 }
551 if (wsaved) {
552 __siginfo_rwin_t __user *rwp = tail;
553 tail += sizeof(*rwp);
554 err |= save_rwin_state(wsaved, rwp);
555 err |= __put_user((u64)rwp, &sf->rwin_save);
556 set_thread_wsaved(0);
557 } else {
558 err |= __put_user(0, &sf->rwin_save);
559 }
560
561 /* Update the siginfo structure. */
562 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
563
564 /* Setup sigaltstack */
565 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
566
567 err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t));
568
569 if (!wsaved) {
570 err |= copy_in_user((u32 __user *)sf,
571 (u32 __user *)(regs->u_regs[UREG_FP]),
572 sizeof(struct reg_window32));
573 } else {
574 struct reg_window *rp;
575
576 rp = ¤t_thread_info()->reg_window[wsaved - 1];
577 for (i = 0; i < 8; i++)
578 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
579 for (i = 0; i < 6; i++)
580 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
581 err |= __put_user(rp->ins[6], &sf->ss.fp);
582 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
583 }
584 if (err)
585 return err;
586
587 /* 3. signal handler back-trampoline and parameters */
588 regs->u_regs[UREG_FP] = (unsigned long) sf;
589 regs->u_regs[UREG_I0] = ksig->sig;
590 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
591 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
592
593 /* 4. signal handler */
594 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
595 regs->tnpc = (regs->tpc + 4);
596 if (test_thread_flag(TIF_32BIT)) {
597 regs->tpc &= 0xffffffff;
598 regs->tnpc &= 0xffffffff;
599 }
600
601 /* 5. return to kernel instructions */
602 if (ksig->ka.ka_restorer)
603 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
604 else {
605 unsigned long address = ((unsigned long)&(sf->insns[0]));
606
607 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
608
609 /* mov __NR_rt_sigreturn, %g1 */
610 err |= __put_user(0x82102065, &sf->insns[0]);
611
612 /* t 0x10 */
613 err |= __put_user(0x91d02010, &sf->insns[1]);
614 if (err)
615 return err;
616
617 flush_signal_insns(address);
618 }
619 return 0;
620}
621
622static inline void handle_signal32(struct ksignal *ksig,
623 struct pt_regs *regs)
624{
625 sigset_t *oldset = sigmask_to_save();
626 int err;
627
628 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
629 err = setup_rt_frame32(ksig, regs, oldset);
630 else
631 err = setup_frame32(ksig, regs, oldset);
632
633 signal_setup_done(err, ksig, 0);
634}
635
636static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
637 struct sigaction *sa)
638{
639 switch (regs->u_regs[UREG_I0]) {
640 case ERESTART_RESTARTBLOCK:
641 case ERESTARTNOHAND:
642 no_system_call_restart:
643 regs->u_regs[UREG_I0] = EINTR;
644 regs->tstate |= TSTATE_ICARRY;
645 break;
646 case ERESTARTSYS:
647 if (!(sa->sa_flags & SA_RESTART))
648 goto no_system_call_restart;
649 fallthrough;
650 case ERESTARTNOINTR:
651 regs->u_regs[UREG_I0] = orig_i0;
652 regs->tpc -= 4;
653 regs->tnpc -= 4;
654 }
655}
656
657/* Note that 'init' is a special process: it doesn't get signals it doesn't
658 * want to handle. Thus you cannot kill init even with a SIGKILL even by
659 * mistake.
660 */
661void do_signal32(struct pt_regs * regs)
662{
663 struct ksignal ksig;
664 unsigned long orig_i0 = 0;
665 int restart_syscall = 0;
666 bool has_handler = get_signal(&ksig);
667
668 if (pt_regs_is_syscall(regs) &&
669 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
670 restart_syscall = 1;
671 orig_i0 = regs->u_regs[UREG_G6];
672 }
673
674 if (has_handler) {
675 if (restart_syscall)
676 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
677 handle_signal32(&ksig, regs);
678 } else {
679 if (restart_syscall) {
680 switch (regs->u_regs[UREG_I0]) {
681 case ERESTARTNOHAND:
682 case ERESTARTSYS:
683 case ERESTARTNOINTR:
684 /* replay the system call when we are done */
685 regs->u_regs[UREG_I0] = orig_i0;
686 regs->tpc -= 4;
687 regs->tnpc -= 4;
688 pt_regs_clear_syscall(regs);
689 fallthrough;
690 case ERESTART_RESTARTBLOCK:
691 regs->u_regs[UREG_G1] = __NR_restart_syscall;
692 regs->tpc -= 4;
693 regs->tnpc -= 4;
694 pt_regs_clear_syscall(regs);
695 }
696 }
697 restore_saved_sigmask();
698 }
699}
700
701struct sigstack32 {
702 u32 the_stack;
703 int cur_status;
704};
705
706asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
707{
708 struct sigstack32 __user *ssptr =
709 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
710 struct sigstack32 __user *ossptr =
711 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
712 int ret = -EFAULT;
713
714 /* First see if old state is wanted. */
715 if (ossptr) {
716 if (put_user(current->sas_ss_sp + current->sas_ss_size,
717 &ossptr->the_stack) ||
718 __put_user(on_sig_stack(sp), &ossptr->cur_status))
719 goto out;
720 }
721
722 /* Now see if we want to update the new state. */
723 if (ssptr) {
724 u32 ss_sp;
725
726 if (get_user(ss_sp, &ssptr->the_stack))
727 goto out;
728
729 /* If the current stack was set with sigaltstack, don't
730 * swap stacks while we are on it.
731 */
732 ret = -EPERM;
733 if (current->sas_ss_sp && on_sig_stack(sp))
734 goto out;
735
736 /* Since we don't know the extent of the stack, and we don't
737 * track onstack-ness, but rather calculate it, we must
738 * presume a size. Ho hum this interface is lossy.
739 */
740 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
741 current->sas_ss_size = SIGSTKSZ;
742 }
743
744 ret = 0;
745out:
746 return ret;
747}