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Linux 5.8-rc4
[linux/fpc-iii.git] / arch / sparc / kernel / signal_64.c
blob6937339a272c5111297dc92d9d81a489777df438
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sparc64/kernel/signal.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
7 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
8 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
9 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
10 */
11
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/signal.h>
15 #include <linux/errno.h>
16 #include <linux/wait.h>
17 #include <linux/ptrace.h>
18 #include <linux/tracehook.h>
19 #include <linux/unistd.h>
20 #include <linux/mm.h>
21 #include <linux/tty.h>
22 #include <linux/binfmts.h>
23 #include <linux/bitops.h>
24 #include <linux/context_tracking.h>
25
26 #include <linux/uaccess.h>
27 #include <asm/ptrace.h>
28 #include <asm/fpumacro.h>
29 #include <asm/uctx.h>
30 #include <asm/siginfo.h>
31 #include <asm/visasm.h>
32 #include <asm/switch_to.h>
33 #include <asm/cacheflush.h>
34
35 #include "sigutil.h"
36 #include "systbls.h"
37 #include "kernel.h"
38 #include "entry.h"
39
40 /* {set, get}context() needed for 64-bit SparcLinux userland. */
41 asmlinkage void sparc64_set_context(struct pt_regs *regs)
42 {
43 struct ucontext __user *ucp = (struct ucontext __user *)
44 regs->u_regs[UREG_I0];
45 enum ctx_state prev_state = exception_enter();
46 mc_gregset_t __user *grp;
47 unsigned long pc, npc, tstate;
48 unsigned long fp, i7;
49 unsigned char fenab;
50 int err;
51
52 synchronize_user_stack();
53 if (get_thread_wsaved() ||
54 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
55 (!__access_ok(ucp, sizeof(*ucp))))
56 goto do_sigsegv;
57 grp = &ucp->uc_mcontext.mc_gregs;
58 err = __get_user(pc, &((*grp)[MC_PC]));
59 err |= __get_user(npc, &((*grp)[MC_NPC]));
60 if (err || ((pc | npc) & 3))
61 goto do_sigsegv;
62 if (regs->u_regs[UREG_I1]) {
63 sigset_t set;
64
65 if (_NSIG_WORDS == 1) {
66 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
67 goto do_sigsegv;
68 } else {
69 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
70 goto do_sigsegv;
71 }
72 set_current_blocked(&set);
73 }
74 if (test_thread_flag(TIF_32BIT)) {
75 pc &= 0xffffffff;
76 npc &= 0xffffffff;
77 }
78 regs->tpc = pc;
79 regs->tnpc = npc;
80 err |= __get_user(regs->y, &((*grp)[MC_Y]));
81 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
82 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
83 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
84 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
85 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
86 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
87 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
88 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
89 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
90
91 /* Skip %g7 as that's the thread register in userspace. */
92
93 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
94 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
95 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
96 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
97 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
98 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
99 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
100 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
101
102 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
103 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
104 err |= __put_user(fp,
105 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
106 err |= __put_user(i7,
107 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
108
109 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
110 if (fenab) {
111 unsigned long *fpregs = current_thread_info()->fpregs;
112 unsigned long fprs;
113
114 fprs_write(0);
115 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
116 if (fprs & FPRS_DL)
117 err |= copy_from_user(fpregs,
118 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
119 (sizeof(unsigned int) * 32));
120 if (fprs & FPRS_DU)
121 err |= copy_from_user(fpregs+16,
122 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
123 (sizeof(unsigned int) * 32));
124 err |= __get_user(current_thread_info()->xfsr[0],
125 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
126 err |= __get_user(current_thread_info()->gsr[0],
127 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
128 regs->tstate &= ~TSTATE_PEF;
129 }
130 if (err)
131 goto do_sigsegv;
132 out:
133 exception_exit(prev_state);
134 return;
135 do_sigsegv:
136 force_sig(SIGSEGV);
137 goto out;
138 }
139
140 asmlinkage void sparc64_get_context(struct pt_regs *regs)
141 {
142 struct ucontext __user *ucp = (struct ucontext __user *)
143 regs->u_regs[UREG_I0];
144 enum ctx_state prev_state = exception_enter();
145 mc_gregset_t __user *grp;
146 mcontext_t __user *mcp;
147 unsigned long fp, i7;
148 unsigned char fenab;
149 int err;
150
151 synchronize_user_stack();
152 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
153 goto do_sigsegv;
154
155 #if 1
156 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
157 #else
158 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
159 #endif
160
161 mcp = &ucp->uc_mcontext;
162 grp = &mcp->mc_gregs;
163
164 /* Skip over the trap instruction, first. */
165 if (test_thread_flag(TIF_32BIT)) {
166 regs->tpc = (regs->tnpc & 0xffffffff);
167 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
168 } else {
169 regs->tpc = regs->tnpc;
170 regs->tnpc += 4;
171 }
172 err = 0;
173 if (_NSIG_WORDS == 1)
174 err |= __put_user(current->blocked.sig[0],
175 (unsigned long __user *)&ucp->uc_sigmask);
176 else
177 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
178 sizeof(sigset_t));
179
180 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
181 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
182 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
183 err |= __put_user(regs->y, &((*grp)[MC_Y]));
184 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
185 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
186 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
187 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
188 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
189 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
190 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
191 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
192 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
193 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
194 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
195 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
196 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
197 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
198 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
199
200 err |= __get_user(fp,
201 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
202 err |= __get_user(i7,
203 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
204 err |= __put_user(fp, &(mcp->mc_fp));
205 err |= __put_user(i7, &(mcp->mc_i7));
206
207 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
208 if (fenab) {
209 unsigned long *fpregs = current_thread_info()->fpregs;
210 unsigned long fprs;
211
212 fprs = current_thread_info()->fpsaved[0];
213 if (fprs & FPRS_DL)
214 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
215 (sizeof(unsigned int) * 32));
216 if (fprs & FPRS_DU)
217 err |= copy_to_user(
218 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
219 (sizeof(unsigned int) * 32));
220 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
221 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
222 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
223 }
224 if (err)
225 goto do_sigsegv;
226 out:
227 exception_exit(prev_state);
228 return;
229 do_sigsegv:
230 force_sig(SIGSEGV);
231 goto out;
232 }
233
234 /* Checks if the fp is valid. We always build rt signal frames which
235 * are 16-byte aligned, therefore we can always enforce that the
236 * restore frame has that property as well.
237 */
238 static bool invalid_frame_pointer(void __user *fp)
239 {
240 if (((unsigned long) fp) & 15)
241 return true;
242 return false;
243 }
244
245 struct rt_signal_frame {
246 struct sparc_stackf ss;
247 siginfo_t info;
248 struct pt_regs regs;
249 __siginfo_fpu_t __user *fpu_save;
250 stack_t stack;
251 sigset_t mask;
252 __siginfo_rwin_t *rwin_save;
253 };
254
255 void do_rt_sigreturn(struct pt_regs *regs)
256 {
257 unsigned long tpc, tnpc, tstate, ufp;
258 struct rt_signal_frame __user *sf;
259 __siginfo_fpu_t __user *fpu_save;
260 __siginfo_rwin_t __user *rwin_save;
261 sigset_t set;
262 int err;
263
264 /* Always make any pending restarted system calls return -EINTR */
265 current->restart_block.fn = do_no_restart_syscall;
266
267 synchronize_user_stack ();
268 sf = (struct rt_signal_frame __user *)
269 (regs->u_regs [UREG_FP] + STACK_BIAS);
270
271 /* 1. Make sure we are not getting garbage from the user */
272 if (invalid_frame_pointer(sf))
273 goto segv;
274
275 if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
276 goto segv;
277
278 if ((ufp + STACK_BIAS) & 0x7)
279 goto segv;
280
281 err = __get_user(tpc, &sf->regs.tpc);
282 err |= __get_user(tnpc, &sf->regs.tnpc);
283 if (test_thread_flag(TIF_32BIT)) {
284 tpc &= 0xffffffff;
285 tnpc &= 0xffffffff;
286 }
287 err |= ((tpc | tnpc) & 3);
288
289 /* 2. Restore the state */
290 err |= __get_user(regs->y, &sf->regs.y);
291 err |= __get_user(tstate, &sf->regs.tstate);
292 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
293
294 /* User can only change condition codes and %asi in %tstate. */
295 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
296 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
297
298 err |= __get_user(fpu_save, &sf->fpu_save);
299 if (!err && fpu_save)
300 err |= restore_fpu_state(regs, fpu_save);
301
302 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
303 err |= restore_altstack(&sf->stack);
304 if (err)
305 goto segv;
306
307 err |= __get_user(rwin_save, &sf->rwin_save);
308 if (!err && rwin_save) {
309 if (restore_rwin_state(rwin_save))
310 goto segv;
311 }
312
313 regs->tpc = tpc;
314 regs->tnpc = tnpc;
315
316 /* Prevent syscall restart. */
317 pt_regs_clear_syscall(regs);
318
319 set_current_blocked(&set);
320 return;
321 segv:
322 force_sig(SIGSEGV);
323 }
324
325 static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
326 {
327 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
328
329 /*
330 * If we are on the alternate signal stack and would overflow it, don't.
331 * Return an always-bogus address instead so we will die with SIGSEGV.
332 */
333 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
334 return (void __user *) -1L;
335
336 /* This is the X/Open sanctioned signal stack switching. */
337 sp = sigsp(sp, ksig) - framesize;
338
339 /* Always align the stack frame. This handles two cases. First,
340 * sigaltstack need not be mindful of platform specific stack
341 * alignment. Second, if we took this signal because the stack
342 * is not aligned properly, we'd like to take the signal cleanly
343 * and report that.
344 */
345 sp &= ~15UL;
346
347 return (void __user *) sp;
348 }
349
350 static inline int
351 setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
352 {
353 struct rt_signal_frame __user *sf;
354 int wsaved, err, sf_size;
355 void __user *tail;
356
357 /* 1. Make sure everything is clean */
358 synchronize_user_stack();
359 save_and_clear_fpu();
360
361 wsaved = get_thread_wsaved();
362
363 sf_size = sizeof(struct rt_signal_frame);
364 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
365 sf_size += sizeof(__siginfo_fpu_t);
366 if (wsaved)
367 sf_size += sizeof(__siginfo_rwin_t);
368 sf = (struct rt_signal_frame __user *)
369 get_sigframe(ksig, regs, sf_size);
370
371 if (invalid_frame_pointer (sf)) {
372 if (show_unhandled_signals)
373 pr_info("%s[%d] bad frame in setup_rt_frame: %016lx TPC %016lx O7 %016lx\n",
374 current->comm, current->pid, (unsigned long)sf,
375 regs->tpc, regs->u_regs[UREG_I7]);
376 force_sigsegv(ksig->sig);
377 return -EINVAL;
378 }
379
380 tail = (sf + 1);
381
382 /* 2. Save the current process state */
383 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
384
385 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
386 __siginfo_fpu_t __user *fpu_save = tail;
387 tail += sizeof(__siginfo_fpu_t);
388 err |= save_fpu_state(regs, fpu_save);
389 err |= __put_user((u64)fpu_save, &sf->fpu_save);
390 } else {
391 err |= __put_user(0, &sf->fpu_save);
392 }
393 if (wsaved) {
394 __siginfo_rwin_t __user *rwin_save = tail;
395 tail += sizeof(__siginfo_rwin_t);
396 err |= save_rwin_state(wsaved, rwin_save);
397 err |= __put_user((u64)rwin_save, &sf->rwin_save);
398 set_thread_wsaved(0);
399 } else {
400 err |= __put_user(0, &sf->rwin_save);
401 }
402
403 /* Setup sigaltstack */
404 err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
405
406 err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));
407
408 if (!wsaved) {
409 err |= copy_in_user((u64 __user *)sf,
410 (u64 __user *)(regs->u_regs[UREG_FP] +
411 STACK_BIAS),
412 sizeof(struct reg_window));
413 } else {
414 struct reg_window *rp;
415
416 rp = &current_thread_info()->reg_window[wsaved - 1];
417 err |= copy_to_user(sf, rp, sizeof(struct reg_window));
418 }
419 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
420 err |= copy_siginfo_to_user(&sf->info, &ksig->info);
421 else {
422 err |= __put_user(ksig->sig, &sf->info.si_signo);
423 err |= __put_user(SI_NOINFO, &sf->info.si_code);
424 }
425 if (err)
426 return err;
427
428 /* 3. signal handler back-trampoline and parameters */
429 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
430 regs->u_regs[UREG_I0] = ksig->sig;
431 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
432
433 /* The sigcontext is passed in this way because of how it
434 * is defined in GLIBC's /usr/include/bits/sigcontext.h
435 * for sparc64. It includes the 128 bytes of siginfo_t.
436 */
437 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
438
439 /* 5. signal handler */
440 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
441 regs->tnpc = (regs->tpc + 4);
442 if (test_thread_flag(TIF_32BIT)) {
443 regs->tpc &= 0xffffffff;
444 regs->tnpc &= 0xffffffff;
445 }
446 /* 4. return to kernel instructions */
447 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
448 return 0;
449 }
450
451 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
452 struct sigaction *sa)
453 {
454 switch (regs->u_regs[UREG_I0]) {
455 case ERESTART_RESTARTBLOCK:
456 case ERESTARTNOHAND:
457 no_system_call_restart:
458 regs->u_regs[UREG_I0] = EINTR;
459 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
460 break;
461 case ERESTARTSYS:
462 if (!(sa->sa_flags & SA_RESTART))
463 goto no_system_call_restart;
464 /* fallthrough */
465 case ERESTARTNOINTR:
466 regs->u_regs[UREG_I0] = orig_i0;
467 regs->tpc -= 4;
468 regs->tnpc -= 4;
469 }
470 }
471
472 /* Note that 'init' is a special process: it doesn't get signals it doesn't
473 * want to handle. Thus you cannot kill init even with a SIGKILL even by
474 * mistake.
475 */
476 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
477 {
478 struct ksignal ksig;
479 int restart_syscall;
480 bool has_handler;
481
482 /* It's a lot of work and synchronization to add a new ptrace
483 * register for GDB to save and restore in order to get
484 * orig_i0 correct for syscall restarts when debugging.
485 *
486 * Although it should be the case that most of the global
487 * registers are volatile across a system call, glibc already
488 * depends upon that fact that we preserve them. So we can't
489 * just use any global register to save away the orig_i0 value.
490 *
491 * In particular %g2, %g3, %g4, and %g5 are all assumed to be
492 * preserved across a system call trap by various pieces of
493 * code in glibc.
494 *
495 * %g7 is used as the "thread register". %g6 is not used in
496 * any fixed manner. %g6 is used as a scratch register and
497 * a compiler temporary, but it's value is never used across
498 * a system call. Therefore %g6 is usable for orig_i0 storage.
499 */
500 if (pt_regs_is_syscall(regs) &&
501 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
502 regs->u_regs[UREG_G6] = orig_i0;
503
504 #ifdef CONFIG_COMPAT
505 if (test_thread_flag(TIF_32BIT)) {
506 do_signal32(regs);
507 return;
508 }
509 #endif
510
511 has_handler = get_signal(&ksig);
512
513 restart_syscall = 0;
514 if (pt_regs_is_syscall(regs) &&
515 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
516 restart_syscall = 1;
517 orig_i0 = regs->u_regs[UREG_G6];
518 }
519
520 if (has_handler) {
521 if (restart_syscall)
522 syscall_restart(orig_i0, regs, &ksig.ka.sa);
523 signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0);
524 } else {
525 if (restart_syscall) {
526 switch (regs->u_regs[UREG_I0]) {
527 case ERESTARTNOHAND:
528 case ERESTARTSYS:
529 case ERESTARTNOINTR:
530 /* replay the system call when we are done */
531 regs->u_regs[UREG_I0] = orig_i0;
532 regs->tpc -= 4;
533 regs->tnpc -= 4;
534 pt_regs_clear_syscall(regs);
535 /* fall through */
536 case ERESTART_RESTARTBLOCK:
537 regs->u_regs[UREG_G1] = __NR_restart_syscall;
538 regs->tpc -= 4;
539 regs->tnpc -= 4;
540 pt_regs_clear_syscall(regs);
541 }
542 }
543 restore_saved_sigmask();
544 }
545 }
546
547 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
548 {
549 user_exit();
550 if (thread_info_flags & _TIF_UPROBE)
551 uprobe_notify_resume(regs);
552 if (thread_info_flags & _TIF_SIGPENDING)
553 do_signal(regs, orig_i0);
554 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
555 clear_thread_flag(TIF_NOTIFY_RESUME);
556 tracehook_notify_resume(regs);
557 }
558 user_enter();
559 }
560
Linux with added FPC-III support