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Linux 5.8-rc4
[linux/fpc-iii.git] / arch / sparc / kernel / signal32.c
blobe2c6f0abda009be9972b82d76e5f4c18b5dd8334
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
40 typedef struct {
41 unsigned int g_upper[8];
42 unsigned int o_upper[8];
43 unsigned int asi;
44 } siginfo_extra_v8plus_t;
45
46 struct 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
58 struct 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 */
76 static 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
84 void 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
171 segv:
172 force_sig(SIGSEGV);
173 }
174
175 asmlinkage 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;
257 segv:
258 force_sig(SIGSEGV);
259 }
260
261 static 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 */
296 static 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
344 out_unmap:
345 pte_unmap(ptep);
346 out_irqs_on:
347 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
348
349 }
350
351 static 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 = &current_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
486 static 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 = &current_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
622 static 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
636 static 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 */
661 void 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 /* fall through */
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
701 struct sigstack32 {
702 u32 the_stack;
703 int cur_status;
704 };
705
706 asmlinkage 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;
745 out:
746 return ret;
747 }
Linux with added FPC-III support