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
41 typedef struct {
42 unsigned int g_upper[8];
43 unsigned int o_upper[8];
44 unsigned int asi;
45 } siginfo_extra_v8plus_t;
46
47 struct 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
59 struct 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 */
invalid_frame_pointer(void __user * fp,int fplen)77 static 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
do_sigreturn32(struct pt_regs * regs)85 void 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
172 segv:
173 force_sig(SIGSEGV);
174 }
175
do_rt_sigreturn32(struct pt_regs * regs)176 asmlinkage 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;
258 segv:
259 force_sig(SIGSEGV);
260 }
261
get_sigframe(struct ksignal * ksig,struct pt_regs * regs,unsigned long framesize)262 static 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 */
flush_signal_insns(unsigned long address)297 static 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
341 out_unmap:
342 pte_unmap(ptep);
343 out_irqs_on:
344 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
345
346 }
347
setup_frame32(struct ksignal * ksig,struct pt_regs * regs,sigset_t * oldset)348 static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
349 sigset_t *oldset)
350 {
351 struct signal_frame32 __user *sf;
352 int i, err, wsaved;
353 void __user *tail;
354 int sigframe_size;
355 u32 psr;
356 compat_sigset_t seta;
357
358 /* 1. Make sure everything is clean */
359 synchronize_user_stack();
360 save_and_clear_fpu();
361
362 wsaved = get_thread_wsaved();
363
364 sigframe_size = sizeof(*sf);
365 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
366 sigframe_size += sizeof(__siginfo_fpu_t);
367 if (wsaved)
368 sigframe_size += sizeof(__siginfo_rwin_t);
369
370 sf = (struct signal_frame32 __user *)
371 get_sigframe(ksig, regs, sigframe_size);
372
373 if (invalid_frame_pointer(sf, sigframe_size)) {
374 if (show_unhandled_signals)
375 pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
376 current->comm, current->pid, (unsigned long)sf,
377 regs->tpc, regs->u_regs[UREG_I7]);
378 force_sigsegv(ksig->sig);
379 return -EINVAL;
380 }
381
382 tail = (sf + 1);
383
384 /* 2. Save the current process state */
385 if (test_thread_flag(TIF_32BIT)) {
386 regs->tpc &= 0xffffffff;
387 regs->tnpc &= 0xffffffff;
388 }
389 err = put_user(regs->tpc, &sf->info.si_regs.pc);
390 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
391 err |= __put_user(regs->y, &sf->info.si_regs.y);
392 psr = tstate_to_psr(regs->tstate);
393 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
394 psr |= PSR_EF;
395 err |= __put_user(psr, &sf->info.si_regs.psr);
396 for (i = 0; i < 16; i++)
397 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
398 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
399 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
400 for (i = 1; i < 16; i++)
401 err |= __put_user(((u32 *)regs->u_regs)[2*i],
402 &sf->v8plus.g_upper[i]);
403 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
404 &sf->v8plus.asi);
405
406 if (psr & PSR_EF) {
407 __siginfo_fpu_t __user *fp = tail;
408 tail += sizeof(*fp);
409 err |= save_fpu_state(regs, fp);
410 err |= __put_user((u64)fp, &sf->fpu_save);
411 } else {
412 err |= __put_user(0, &sf->fpu_save);
413 }
414 if (wsaved) {
415 __siginfo_rwin_t __user *rwp = tail;
416 tail += sizeof(*rwp);
417 err |= save_rwin_state(wsaved, rwp);
418 err |= __put_user((u64)rwp, &sf->rwin_save);
419 set_thread_wsaved(0);
420 } else {
421 err |= __put_user(0, &sf->rwin_save);
422 }
423
424 /* If these change we need to know - assignments to seta relies on these sizes */
425 BUILD_BUG_ON(_NSIG_WORDS != 1);
426 BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
427 seta.sig[1] = (oldset->sig[0] >> 32);
428 seta.sig[0] = oldset->sig[0];
429
430 err |= __put_user(seta.sig[0], &sf->info.si_mask);
431 err |= __copy_to_user(sf->extramask, &seta.sig[1],
432 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
433
434 if (!wsaved) {
435 err |= copy_in_user((u32 __user *)sf,
436 (u32 __user *)(regs->u_regs[UREG_FP]),
437 sizeof(struct reg_window32));
438 } else {
439 struct reg_window *rp;
440
441 rp = ¤t_thread_info()->reg_window[wsaved - 1];
442 for (i = 0; i < 8; i++)
443 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
444 for (i = 0; i < 6; i++)
445 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
446 err |= __put_user(rp->ins[6], &sf->ss.fp);
447 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
448 }
449 if (err)
450 return err;
451
452 /* 3. signal handler back-trampoline and parameters */
453 regs->u_regs[UREG_FP] = (unsigned long) sf;
454 regs->u_regs[UREG_I0] = ksig->sig;
455 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
456 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
457
458 /* 4. signal handler */
459 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
460 regs->tnpc = (regs->tpc + 4);
461 if (test_thread_flag(TIF_32BIT)) {
462 regs->tpc &= 0xffffffff;
463 regs->tnpc &= 0xffffffff;
464 }
465
466 /* 5. return to kernel instructions */
467 if (ksig->ka.ka_restorer) {
468 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
469 } else {
470 unsigned long address = ((unsigned long)&(sf->insns[0]));
471
472 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
473
474 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
475 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
476 if (err)
477 return err;
478 flush_signal_insns(address);
479 }
480 return 0;
481 }
482
setup_rt_frame32(struct ksignal * ksig,struct pt_regs * regs,sigset_t * oldset)483 static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
484 sigset_t *oldset)
485 {
486 struct rt_signal_frame32 __user *sf;
487 int i, err, wsaved;
488 void __user *tail;
489 int sigframe_size;
490 u32 psr;
491
492 /* 1. Make sure everything is clean */
493 synchronize_user_stack();
494 save_and_clear_fpu();
495
496 wsaved = get_thread_wsaved();
497
498 sigframe_size = sizeof(*sf);
499 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
500 sigframe_size += sizeof(__siginfo_fpu_t);
501 if (wsaved)
502 sigframe_size += sizeof(__siginfo_rwin_t);
503
504 sf = (struct rt_signal_frame32 __user *)
505 get_sigframe(ksig, regs, sigframe_size);
506
507 if (invalid_frame_pointer(sf, sigframe_size)) {
508 if (show_unhandled_signals)
509 pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
510 current->comm, current->pid, (unsigned long)sf,
511 regs->tpc, regs->u_regs[UREG_I7]);
512 force_sigsegv(ksig->sig);
513 return -EINVAL;
514 }
515
516 tail = (sf + 1);
517
518 /* 2. Save the current process state */
519 if (test_thread_flag(TIF_32BIT)) {
520 regs->tpc &= 0xffffffff;
521 regs->tnpc &= 0xffffffff;
522 }
523 err = put_user(regs->tpc, &sf->regs.pc);
524 err |= __put_user(regs->tnpc, &sf->regs.npc);
525 err |= __put_user(regs->y, &sf->regs.y);
526 psr = tstate_to_psr(regs->tstate);
527 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
528 psr |= PSR_EF;
529 err |= __put_user(psr, &sf->regs.psr);
530 for (i = 0; i < 16; i++)
531 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
532 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
533 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
534 for (i = 1; i < 16; i++)
535 err |= __put_user(((u32 *)regs->u_regs)[2*i],
536 &sf->v8plus.g_upper[i]);
537 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
538 &sf->v8plus.asi);
539
540 if (psr & PSR_EF) {
541 __siginfo_fpu_t __user *fp = tail;
542 tail += sizeof(*fp);
543 err |= save_fpu_state(regs, fp);
544 err |= __put_user((u64)fp, &sf->fpu_save);
545 } else {
546 err |= __put_user(0, &sf->fpu_save);
547 }
548 if (wsaved) {
549 __siginfo_rwin_t __user *rwp = tail;
550 tail += sizeof(*rwp);
551 err |= save_rwin_state(wsaved, rwp);
552 err |= __put_user((u64)rwp, &sf->rwin_save);
553 set_thread_wsaved(0);
554 } else {
555 err |= __put_user(0, &sf->rwin_save);
556 }
557
558 /* Update the siginfo structure. */
559 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
560
561 /* Setup sigaltstack */
562 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
563
564 err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t));
565
566 if (!wsaved) {
567 err |= copy_in_user((u32 __user *)sf,
568 (u32 __user *)(regs->u_regs[UREG_FP]),
569 sizeof(struct reg_window32));
570 } else {
571 struct reg_window *rp;
572
573 rp = ¤t_thread_info()->reg_window[wsaved - 1];
574 for (i = 0; i < 8; i++)
575 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
576 for (i = 0; i < 6; i++)
577 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
578 err |= __put_user(rp->ins[6], &sf->ss.fp);
579 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
580 }
581 if (err)
582 return err;
583
584 /* 3. signal handler back-trampoline and parameters */
585 regs->u_regs[UREG_FP] = (unsigned long) sf;
586 regs->u_regs[UREG_I0] = ksig->sig;
587 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
588 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
589
590 /* 4. signal handler */
591 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
592 regs->tnpc = (regs->tpc + 4);
593 if (test_thread_flag(TIF_32BIT)) {
594 regs->tpc &= 0xffffffff;
595 regs->tnpc &= 0xffffffff;
596 }
597
598 /* 5. return to kernel instructions */
599 if (ksig->ka.ka_restorer)
600 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
601 else {
602 unsigned long address = ((unsigned long)&(sf->insns[0]));
603
604 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
605
606 /* mov __NR_rt_sigreturn, %g1 */
607 err |= __put_user(0x82102065, &sf->insns[0]);
608
609 /* t 0x10 */
610 err |= __put_user(0x91d02010, &sf->insns[1]);
611 if (err)
612 return err;
613
614 flush_signal_insns(address);
615 }
616 return 0;
617 }
618
handle_signal32(struct ksignal * ksig,struct pt_regs * regs)619 static inline void handle_signal32(struct ksignal *ksig,
620 struct pt_regs *regs)
621 {
622 sigset_t *oldset = sigmask_to_save();
623 int err;
624
625 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
626 err = setup_rt_frame32(ksig, regs, oldset);
627 else
628 err = setup_frame32(ksig, regs, oldset);
629
630 signal_setup_done(err, ksig, 0);
631 }
632
syscall_restart32(unsigned long orig_i0,struct pt_regs * regs,struct sigaction * sa)633 static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
634 struct sigaction *sa)
635 {
636 switch (regs->u_regs[UREG_I0]) {
637 case ERESTART_RESTARTBLOCK:
638 case ERESTARTNOHAND:
639 no_system_call_restart:
640 regs->u_regs[UREG_I0] = EINTR;
641 regs->tstate |= TSTATE_ICARRY;
642 break;
643 case ERESTARTSYS:
644 if (!(sa->sa_flags & SA_RESTART))
645 goto no_system_call_restart;
646 /* fallthrough */
647 case ERESTARTNOINTR:
648 regs->u_regs[UREG_I0] = orig_i0;
649 regs->tpc -= 4;
650 regs->tnpc -= 4;
651 }
652 }
653
654 /* Note that 'init' is a special process: it doesn't get signals it doesn't
655 * want to handle. Thus you cannot kill init even with a SIGKILL even by
656 * mistake.
657 */
do_signal32(struct pt_regs * regs)658 void do_signal32(struct pt_regs * regs)
659 {
660 struct ksignal ksig;
661 unsigned long orig_i0 = 0;
662 int restart_syscall = 0;
663 bool has_handler = get_signal(&ksig);
664
665 if (pt_regs_is_syscall(regs) &&
666 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
667 restart_syscall = 1;
668 orig_i0 = regs->u_regs[UREG_G6];
669 }
670
671 if (has_handler) {
672 if (restart_syscall)
673 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
674 handle_signal32(&ksig, regs);
675 } else {
676 if (restart_syscall) {
677 switch (regs->u_regs[UREG_I0]) {
678 case ERESTARTNOHAND:
679 case ERESTARTSYS:
680 case ERESTARTNOINTR:
681 /* replay the system call when we are done */
682 regs->u_regs[UREG_I0] = orig_i0;
683 regs->tpc -= 4;
684 regs->tnpc -= 4;
685 pt_regs_clear_syscall(regs);
686 /* fall through */
687 case ERESTART_RESTARTBLOCK:
688 regs->u_regs[UREG_G1] = __NR_restart_syscall;
689 regs->tpc -= 4;
690 regs->tnpc -= 4;
691 pt_regs_clear_syscall(regs);
692 }
693 }
694 restore_saved_sigmask();
695 }
696 }
697
698 struct sigstack32 {
699 u32 the_stack;
700 int cur_status;
701 };
702
do_sys32_sigstack(u32 u_ssptr,u32 u_ossptr,unsigned long sp)703 asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
704 {
705 struct sigstack32 __user *ssptr =
706 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
707 struct sigstack32 __user *ossptr =
708 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
709 int ret = -EFAULT;
710
711 /* First see if old state is wanted. */
712 if (ossptr) {
713 if (put_user(current->sas_ss_sp + current->sas_ss_size,
714 &ossptr->the_stack) ||
715 __put_user(on_sig_stack(sp), &ossptr->cur_status))
716 goto out;
717 }
718
719 /* Now see if we want to update the new state. */
720 if (ssptr) {
721 u32 ss_sp;
722
723 if (get_user(ss_sp, &ssptr->the_stack))
724 goto out;
725
726 /* If the current stack was set with sigaltstack, don't
727 * swap stacks while we are on it.
728 */
729 ret = -EPERM;
730 if (current->sas_ss_sp && on_sig_stack(sp))
731 goto out;
732
733 /* Since we don't know the extent of the stack, and we don't
734 * track onstack-ness, but rather calculate it, we must
735 * presume a size. Ho hum this interface is lossy.
736 */
737 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
738 current->sas_ss_size = SIGSTKSZ;
739 }
740
741 ret = 0;
742 out:
743 return ret;
744 }
745