1 // SPDX-License-Identifier: GPL-2.0
3 * arch/sparc64/kernel/signal.c
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)
13 #include <linux/compat.h> /* for compat_old_sigset_t */
15 #include <linux/sched.h>
16 #include <linux/kernel.h>
17 #include <linux/signal.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/ptrace.h>
21 #include <linux/tracehook.h>
22 #include <linux/unistd.h>
24 #include <linux/tty.h>
25 #include <linux/binfmts.h>
26 #include <linux/bitops.h>
27 #include <linux/context_tracking.h>
29 #include <linux/uaccess.h>
30 #include <asm/ptrace.h>
31 #include <asm/pgtable.h>
32 #include <asm/fpumacro.h>
34 #include <asm/siginfo.h>
35 #include <asm/visasm.h>
36 #include <asm/switch_to.h>
37 #include <asm/cacheflush.h>
44 /* {set, get}context() needed for 64-bit SparcLinux userland. */
45 asmlinkage void sparc64_set_context(struct pt_regs *regs)
47 struct ucontext __user *ucp = (struct ucontext __user *)
48 regs->u_regs[UREG_I0];
49 enum ctx_state prev_state = exception_enter();
50 mc_gregset_t __user *grp;
51 unsigned long pc, npc, tstate;
56 synchronize_user_stack();
57 if (get_thread_wsaved() ||
58 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
59 (!__access_ok(ucp, sizeof(*ucp))))
61 grp = &ucp->uc_mcontext.mc_gregs;
62 err = __get_user(pc, &((*grp)[MC_PC]));
63 err |= __get_user(npc, &((*grp)[MC_NPC]));
64 if (err || ((pc | npc) & 3))
66 if (regs->u_regs[UREG_I1]) {
69 if (_NSIG_WORDS == 1) {
70 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
73 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
76 set_current_blocked(&set);
78 if (test_thread_flag(TIF_32BIT)) {
84 err |= __get_user(regs->y, &((*grp)[MC_Y]));
85 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
86 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
87 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
88 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
89 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
90 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
91 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
92 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
93 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
95 /* Skip %g7 as that's the thread register in userspace. */
97 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
98 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
99 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
100 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
101 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
102 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
103 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
104 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
106 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
107 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
108 err |= __put_user(fp,
109 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
110 err |= __put_user(i7,
111 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
113 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
115 unsigned long *fpregs = current_thread_info()->fpregs;
119 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
121 err |= copy_from_user(fpregs,
122 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
123 (sizeof(unsigned int) * 32));
125 err |= copy_from_user(fpregs+16,
126 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
127 (sizeof(unsigned int) * 32));
128 err |= __get_user(current_thread_info()->xfsr[0],
129 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
130 err |= __get_user(current_thread_info()->gsr[0],
131 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
132 regs->tstate &= ~TSTATE_PEF;
137 exception_exit(prev_state);
140 force_sig(SIGSEGV, current);
144 asmlinkage void sparc64_get_context(struct pt_regs *regs)
146 struct ucontext __user *ucp = (struct ucontext __user *)
147 regs->u_regs[UREG_I0];
148 enum ctx_state prev_state = exception_enter();
149 mc_gregset_t __user *grp;
150 mcontext_t __user *mcp;
151 unsigned long fp, i7;
155 synchronize_user_stack();
156 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
160 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
162 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
165 mcp = &ucp->uc_mcontext;
166 grp = &mcp->mc_gregs;
168 /* Skip over the trap instruction, first. */
169 if (test_thread_flag(TIF_32BIT)) {
170 regs->tpc = (regs->tnpc & 0xffffffff);
171 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
173 regs->tpc = regs->tnpc;
177 if (_NSIG_WORDS == 1)
178 err |= __put_user(current->blocked.sig[0],
179 (unsigned long __user *)&ucp->uc_sigmask);
181 err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked,
184 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
185 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
186 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
187 err |= __put_user(regs->y, &((*grp)[MC_Y]));
188 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
189 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
190 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
191 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
192 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
193 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
194 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
195 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
196 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
197 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
198 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
199 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
200 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
201 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
202 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
204 err |= __get_user(fp,
205 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
206 err |= __get_user(i7,
207 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
208 err |= __put_user(fp, &(mcp->mc_fp));
209 err |= __put_user(i7, &(mcp->mc_i7));
211 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
213 unsigned long *fpregs = current_thread_info()->fpregs;
216 fprs = current_thread_info()->fpsaved[0];
218 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
219 (sizeof(unsigned int) * 32));
222 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
223 (sizeof(unsigned int) * 32));
224 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
225 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
226 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
231 exception_exit(prev_state);
234 force_sig(SIGSEGV, current);
238 /* Checks if the fp is valid. We always build rt signal frames which
239 * are 16-byte aligned, therefore we can always enforce that the
240 * restore frame has that property as well.
242 static bool invalid_frame_pointer(void __user *fp)
244 if (((unsigned long) fp) & 15)
249 struct rt_signal_frame {
250 struct sparc_stackf ss;
253 __siginfo_fpu_t __user *fpu_save;
256 __siginfo_rwin_t *rwin_save;
259 void do_rt_sigreturn(struct pt_regs *regs)
261 unsigned long tpc, tnpc, tstate, ufp;
262 struct rt_signal_frame __user *sf;
263 __siginfo_fpu_t __user *fpu_save;
264 __siginfo_rwin_t __user *rwin_save;
268 /* Always make any pending restarted system calls return -EINTR */
269 current->restart_block.fn = do_no_restart_syscall;
271 synchronize_user_stack ();
272 sf = (struct rt_signal_frame __user *)
273 (regs->u_regs [UREG_FP] + STACK_BIAS);
275 /* 1. Make sure we are not getting garbage from the user */
276 if (invalid_frame_pointer(sf))
279 if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
282 if ((ufp + STACK_BIAS) & 0x7)
285 err = __get_user(tpc, &sf->regs.tpc);
286 err |= __get_user(tnpc, &sf->regs.tnpc);
287 if (test_thread_flag(TIF_32BIT)) {
291 err |= ((tpc | tnpc) & 3);
293 /* 2. Restore the state */
294 err |= __get_user(regs->y, &sf->regs.y);
295 err |= __get_user(tstate, &sf->regs.tstate);
296 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
298 /* User can only change condition codes and %asi in %tstate. */
299 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
300 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
302 err |= __get_user(fpu_save, &sf->fpu_save);
303 if (!err && fpu_save)
304 err |= restore_fpu_state(regs, fpu_save);
306 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
307 err |= restore_altstack(&sf->stack);
311 err |= __get_user(rwin_save, &sf->rwin_save);
312 if (!err && rwin_save) {
313 if (restore_rwin_state(rwin_save))
320 /* Prevent syscall restart. */
321 pt_regs_clear_syscall(regs);
323 set_current_blocked(&set);
326 force_sig(SIGSEGV, current);
329 static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
331 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
334 * If we are on the alternate signal stack and would overflow it, don't.
335 * Return an always-bogus address instead so we will die with SIGSEGV.
337 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
338 return (void __user *) -1L;
340 /* This is the X/Open sanctioned signal stack switching. */
341 sp = sigsp(sp, ksig) - framesize;
343 /* Always align the stack frame. This handles two cases. First,
344 * sigaltstack need not be mindful of platform specific stack
345 * alignment. Second, if we took this signal because the stack
346 * is not aligned properly, we'd like to take the signal cleanly
351 return (void __user *) sp;
355 setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
357 struct rt_signal_frame __user *sf;
358 int wsaved, err, sf_size;
361 /* 1. Make sure everything is clean */
362 synchronize_user_stack();
363 save_and_clear_fpu();
365 wsaved = get_thread_wsaved();
367 sf_size = sizeof(struct rt_signal_frame);
368 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
369 sf_size += sizeof(__siginfo_fpu_t);
371 sf_size += sizeof(__siginfo_rwin_t);
372 sf = (struct rt_signal_frame __user *)
373 get_sigframe(ksig, regs, sf_size);
375 if (invalid_frame_pointer (sf)) {
376 if (show_unhandled_signals)
377 pr_info("%s[%d] bad frame in setup_rt_frame: %016lx TPC %016lx O7 %016lx\n",
378 current->comm, current->pid, (unsigned long)sf,
379 regs->tpc, regs->u_regs[UREG_I7]);
380 force_sigsegv(ksig->sig, current);
386 /* 2. Save the current process state */
387 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
389 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
390 __siginfo_fpu_t __user *fpu_save = tail;
391 tail += sizeof(__siginfo_fpu_t);
392 err |= save_fpu_state(regs, fpu_save);
393 err |= __put_user((u64)fpu_save, &sf->fpu_save);
395 err |= __put_user(0, &sf->fpu_save);
398 __siginfo_rwin_t __user *rwin_save = tail;
399 tail += sizeof(__siginfo_rwin_t);
400 err |= save_rwin_state(wsaved, rwin_save);
401 err |= __put_user((u64)rwin_save, &sf->rwin_save);
402 set_thread_wsaved(0);
404 err |= __put_user(0, &sf->rwin_save);
407 /* Setup sigaltstack */
408 err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
410 err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));
413 err |= copy_in_user((u64 __user *)sf,
414 (u64 __user *)(regs->u_regs[UREG_FP] +
416 sizeof(struct reg_window));
418 struct reg_window *rp;
420 rp = ¤t_thread_info()->reg_window[wsaved - 1];
421 err |= copy_to_user(sf, rp, sizeof(struct reg_window));
423 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
424 err |= copy_siginfo_to_user(&sf->info, &ksig->info);
426 err |= __put_user(ksig->sig, &sf->info.si_signo);
427 err |= __put_user(SI_NOINFO, &sf->info.si_code);
432 /* 3. signal handler back-trampoline and parameters */
433 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
434 regs->u_regs[UREG_I0] = ksig->sig;
435 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
437 /* The sigcontext is passed in this way because of how it
438 * is defined in GLIBC's /usr/include/bits/sigcontext.h
439 * for sparc64. It includes the 128 bytes of siginfo_t.
441 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
443 /* 5. signal handler */
444 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
445 regs->tnpc = (regs->tpc + 4);
446 if (test_thread_flag(TIF_32BIT)) {
447 regs->tpc &= 0xffffffff;
448 regs->tnpc &= 0xffffffff;
450 /* 4. return to kernel instructions */
451 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
455 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
456 struct sigaction *sa)
458 switch (regs->u_regs[UREG_I0]) {
459 case ERESTART_RESTARTBLOCK:
461 no_system_call_restart:
462 regs->u_regs[UREG_I0] = EINTR;
463 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
466 if (!(sa->sa_flags & SA_RESTART))
467 goto no_system_call_restart;
470 regs->u_regs[UREG_I0] = orig_i0;
476 /* Note that 'init' is a special process: it doesn't get signals it doesn't
477 * want to handle. Thus you cannot kill init even with a SIGKILL even by
480 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
486 /* It's a lot of work and synchronization to add a new ptrace
487 * register for GDB to save and restore in order to get
488 * orig_i0 correct for syscall restarts when debugging.
490 * Although it should be the case that most of the global
491 * registers are volatile across a system call, glibc already
492 * depends upon that fact that we preserve them. So we can't
493 * just use any global register to save away the orig_i0 value.
495 * In particular %g2, %g3, %g4, and %g5 are all assumed to be
496 * preserved across a system call trap by various pieces of
499 * %g7 is used as the "thread register". %g6 is not used in
500 * any fixed manner. %g6 is used as a scratch register and
501 * a compiler temporary, but it's value is never used across
502 * a system call. Therefore %g6 is usable for orig_i0 storage.
504 if (pt_regs_is_syscall(regs) &&
505 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
506 regs->u_regs[UREG_G6] = orig_i0;
509 if (test_thread_flag(TIF_32BIT)) {
515 has_handler = get_signal(&ksig);
518 if (pt_regs_is_syscall(regs) &&
519 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
521 orig_i0 = regs->u_regs[UREG_G6];
526 syscall_restart(orig_i0, regs, &ksig.ka.sa);
527 signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0);
529 if (restart_syscall) {
530 switch (regs->u_regs[UREG_I0]) {
534 /* replay the system call when we are done */
535 regs->u_regs[UREG_I0] = orig_i0;
538 pt_regs_clear_syscall(regs);
539 case ERESTART_RESTARTBLOCK:
540 regs->u_regs[UREG_G1] = __NR_restart_syscall;
543 pt_regs_clear_syscall(regs);
546 restore_saved_sigmask();
550 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
553 if (thread_info_flags & _TIF_UPROBE)
554 uprobe_notify_resume(regs);
555 if (thread_info_flags & _TIF_SIGPENDING)
556 do_signal(regs, orig_i0);
557 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
558 clear_thread_flag(TIF_NOTIFY_RESUME);
559 tracehook_notify_resume(regs);