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v6.2
  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/resume_user_mode.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. */
 41asmlinkage 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;
132out:
133	exception_exit(prev_state);
134	return;
135do_sigsegv:
136	force_sig(SIGSEGV);
137	goto out;
138}
139
140asmlinkage 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;
226out:
227	exception_exit(prev_state);
228	return;
229do_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 */
238static bool invalid_frame_pointer(void __user *fp)
239{
240	if (((unsigned long) fp) & 15)
241		return true;
242	return false;
243}
244
245struct 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
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
255void 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;
321segv:
322	force_sig(SIGSEGV);
 
 
 
 
 
 
 
 
323}
324
325static 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
350static inline int
351setup_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 |= raw_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
451static 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 */
476static 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				fallthrough;
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
547void 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 | _TIF_NOTIFY_SIGNAL))
553		do_signal(regs, orig_i0);
554	if (thread_info_flags & _TIF_NOTIFY_RESUME)
555		resume_user_mode_work(regs);
556	user_enter();
 
 
 
557}
558
559/*
560 * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as
561 * changes likely come with new fields that should be added below.
562 */
563static_assert(NSIGILL	== 11);
564static_assert(NSIGFPE	== 15);
565static_assert(NSIGSEGV	== 9);
566static_assert(NSIGBUS	== 5);
567static_assert(NSIGTRAP	== 6);
568static_assert(NSIGCHLD	== 6);
569static_assert(NSIGSYS	== 2);
570static_assert(sizeof(siginfo_t) == 128);
571static_assert(__alignof__(siginfo_t) == 8);
572static_assert(offsetof(siginfo_t, si_signo)	== 0x00);
573static_assert(offsetof(siginfo_t, si_errno)	== 0x04);
574static_assert(offsetof(siginfo_t, si_code)	== 0x08);
575static_assert(offsetof(siginfo_t, si_pid)	== 0x10);
576static_assert(offsetof(siginfo_t, si_uid)	== 0x14);
577static_assert(offsetof(siginfo_t, si_tid)	== 0x10);
578static_assert(offsetof(siginfo_t, si_overrun)	== 0x14);
579static_assert(offsetof(siginfo_t, si_status)	== 0x18);
580static_assert(offsetof(siginfo_t, si_utime)	== 0x20);
581static_assert(offsetof(siginfo_t, si_stime)	== 0x28);
582static_assert(offsetof(siginfo_t, si_value)	== 0x18);
583static_assert(offsetof(siginfo_t, si_int)	== 0x18);
584static_assert(offsetof(siginfo_t, si_ptr)	== 0x18);
585static_assert(offsetof(siginfo_t, si_addr)	== 0x10);
586static_assert(offsetof(siginfo_t, si_trapno)	== 0x18);
587static_assert(offsetof(siginfo_t, si_addr_lsb)	== 0x18);
588static_assert(offsetof(siginfo_t, si_lower)	== 0x20);
589static_assert(offsetof(siginfo_t, si_upper)	== 0x28);
590static_assert(offsetof(siginfo_t, si_pkey)	== 0x20);
591static_assert(offsetof(siginfo_t, si_perf_data)	== 0x18);
592static_assert(offsetof(siginfo_t, si_perf_type)	== 0x20);
593static_assert(offsetof(siginfo_t, si_perf_flags) == 0x24);
594static_assert(offsetof(siginfo_t, si_band)	== 0x10);
595static_assert(offsetof(siginfo_t, si_fd)	== 0x14);
v3.1
 
  1/*
  2 *  arch/sparc64/kernel/signal.c
  3 *
  4 *  Copyright (C) 1991, 1992  Linus Torvalds
  5 *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
  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#ifdef CONFIG_COMPAT
 12#include <linux/compat.h>	/* for compat_old_sigset_t */
 13#endif
 14#include <linux/sched.h>
 15#include <linux/kernel.h>
 16#include <linux/signal.h>
 17#include <linux/errno.h>
 18#include <linux/wait.h>
 19#include <linux/ptrace.h>
 20#include <linux/tracehook.h>
 21#include <linux/unistd.h>
 22#include <linux/mm.h>
 23#include <linux/tty.h>
 24#include <linux/binfmts.h>
 25#include <linux/bitops.h>
 
 26
 27#include <asm/uaccess.h>
 28#include <asm/ptrace.h>
 29#include <asm/pgtable.h>
 30#include <asm/fpumacro.h>
 31#include <asm/uctx.h>
 32#include <asm/siginfo.h>
 33#include <asm/visasm.h>
 
 
 34
 
 
 
 35#include "entry.h"
 36#include "systbls.h"
 37#include "sigutil.h"
 38
 39#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 40
 41/* {set, get}context() needed for 64-bit SparcLinux userland. */
 42asmlinkage void sparc64_set_context(struct pt_regs *regs)
 43{
 44	struct ucontext __user *ucp = (struct ucontext __user *)
 45		regs->u_regs[UREG_I0];
 
 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	flush_user_windows();
 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		sigdelsetmask(&set, ~_BLOCKABLE);
 73		set_current_blocked(&set);
 74	}
 75	if (test_thread_flag(TIF_32BIT)) {
 76		pc &= 0xffffffff;
 77		npc &= 0xffffffff;
 78	}
 79	regs->tpc = pc;
 80	regs->tnpc = npc;
 81	err |= __get_user(regs->y, &((*grp)[MC_Y]));
 82	err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
 83	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
 84	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
 85	err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
 86	err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
 87	err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
 88	err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
 89	err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
 90	err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
 91
 92	/* Skip %g7 as that's the thread register in userspace.  */
 93
 94	err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
 95	err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
 96	err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
 97	err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
 98	err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
 99	err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
100	err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
101	err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
102
103	err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
104	err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
105	err |= __put_user(fp,
106	      (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
107	err |= __put_user(i7,
108	      (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
109
110	err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
111	if (fenab) {
112		unsigned long *fpregs = current_thread_info()->fpregs;
113		unsigned long fprs;
114		
115		fprs_write(0);
116		err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
117		if (fprs & FPRS_DL)
118			err |= copy_from_user(fpregs,
119					      &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
120					      (sizeof(unsigned int) * 32));
121		if (fprs & FPRS_DU)
122			err |= copy_from_user(fpregs+16,
123			 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
124			 (sizeof(unsigned int) * 32));
125		err |= __get_user(current_thread_info()->xfsr[0],
126				  &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
127		err |= __get_user(current_thread_info()->gsr[0],
128				  &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
129		regs->tstate &= ~TSTATE_PEF;
130	}
131	if (err)
132		goto do_sigsegv;
133
 
134	return;
135do_sigsegv:
136	force_sig(SIGSEGV, current);
 
137}
138
139asmlinkage void sparc64_get_context(struct pt_regs *regs)
140{
141	struct ucontext __user *ucp = (struct ucontext __user *)
142		regs->u_regs[UREG_I0];
 
143	mc_gregset_t __user *grp;
144	mcontext_t __user *mcp;
145	unsigned long fp, i7;
146	unsigned char fenab;
147	int err;
148
149	synchronize_user_stack();
150	if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
151		goto do_sigsegv;
152
153#if 1
154	fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
155#else
156	fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
157#endif
158		
159	mcp = &ucp->uc_mcontext;
160	grp = &mcp->mc_gregs;
161
162	/* Skip over the trap instruction, first. */
163	if (test_thread_flag(TIF_32BIT)) {
164		regs->tpc   = (regs->tnpc & 0xffffffff);
165		regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
166	} else {
167		regs->tpc   = regs->tnpc;
168		regs->tnpc += 4;
169	}
170	err = 0;
171	if (_NSIG_WORDS == 1)
172		err |= __put_user(current->blocked.sig[0],
173				  (unsigned long __user *)&ucp->uc_sigmask);
174	else
175		err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
176				      sizeof(sigset_t));
177
178	err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
179	err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
180	err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
181	err |= __put_user(regs->y, &((*grp)[MC_Y]));
182	err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
183	err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
184	err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
185	err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
186	err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
187	err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
188	err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
189	err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
190	err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
191	err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
192	err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
193	err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
194	err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
195	err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
196	err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
197
198	err |= __get_user(fp,
199		 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
200	err |= __get_user(i7,
201		 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
202	err |= __put_user(fp, &(mcp->mc_fp));
203	err |= __put_user(i7, &(mcp->mc_i7));
204
205	err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
206	if (fenab) {
207		unsigned long *fpregs = current_thread_info()->fpregs;
208		unsigned long fprs;
209		
210		fprs = current_thread_info()->fpsaved[0];
211		if (fprs & FPRS_DL)
212			err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
213					    (sizeof(unsigned int) * 32));
214		if (fprs & FPRS_DU)
215			err |= copy_to_user(
216                          ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
217			  (sizeof(unsigned int) * 32));
218		err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
219		err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
220		err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
221	}
222	if (err)
223		goto do_sigsegv;
224
 
225	return;
226do_sigsegv:
227	force_sig(SIGSEGV, current);
 
 
 
 
 
 
 
 
 
 
 
 
228}
229
230struct rt_signal_frame {
231	struct sparc_stackf	ss;
232	siginfo_t		info;
233	struct pt_regs		regs;
234	__siginfo_fpu_t __user	*fpu_save;
235	stack_t			stack;
236	sigset_t		mask;
237	__siginfo_rwin_t	*rwin_save;
238};
239
240static long _sigpause_common(old_sigset_t set)
241{
242	sigset_t blocked;
243
244	current->saved_sigmask = current->blocked;
245
246	set &= _BLOCKABLE;
247	siginitset(&blocked, set);
248	set_current_blocked(&blocked);
249
250	current->state = TASK_INTERRUPTIBLE;
251	schedule();
252
253	set_restore_sigmask();
254
255	return -ERESTARTNOHAND;
256}
257
258asmlinkage long sys_sigpause(unsigned int set)
259{
260	return _sigpause_common(set);
261}
262
263asmlinkage long sys_sigsuspend(old_sigset_t set)
264{
265	return _sigpause_common(set);
266}
267
268void do_rt_sigreturn(struct pt_regs *regs)
269{
 
270	struct rt_signal_frame __user *sf;
271	unsigned long tpc, tnpc, tstate;
272	__siginfo_fpu_t __user *fpu_save;
273	__siginfo_rwin_t __user *rwin_save;
274	sigset_t set;
275	int err;
276
277	/* Always make any pending restarted system calls return -EINTR */
278	current_thread_info()->restart_block.fn = do_no_restart_syscall;
279
280	synchronize_user_stack ();
281	sf = (struct rt_signal_frame __user *)
282		(regs->u_regs [UREG_FP] + STACK_BIAS);
283
284	/* 1. Make sure we are not getting garbage from the user */
285	if (((unsigned long) sf) & 3)
 
 
 
 
 
 
286		goto segv;
287
288	err = get_user(tpc, &sf->regs.tpc);
289	err |= __get_user(tnpc, &sf->regs.tnpc);
290	if (test_thread_flag(TIF_32BIT)) {
291		tpc &= 0xffffffff;
292		tnpc &= 0xffffffff;
293	}
294	err |= ((tpc | tnpc) & 3);
295
296	/* 2. Restore the state */
297	err |= __get_user(regs->y, &sf->regs.y);
298	err |= __get_user(tstate, &sf->regs.tstate);
299	err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
300
301	/* User can only change condition codes and %asi in %tstate. */
302	regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
303	regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
304
305	err |= __get_user(fpu_save, &sf->fpu_save);
306	if (!err && fpu_save)
307		err |= restore_fpu_state(regs, fpu_save);
308
309	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
310	err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
311
312	if (err)
313		goto segv;
314
315	err |= __get_user(rwin_save, &sf->rwin_save);
316	if (!err && rwin_save) {
317		if (restore_rwin_state(rwin_save))
318			goto segv;
319	}
320
321	regs->tpc = tpc;
322	regs->tnpc = tnpc;
323
324	/* Prevent syscall restart.  */
325	pt_regs_clear_syscall(regs);
326
327	sigdelsetmask(&set, ~_BLOCKABLE);
328	set_current_blocked(&set);
329	return;
330segv:
331	force_sig(SIGSEGV, current);
332}
333
334/* Checks if the fp is valid */
335static int invalid_frame_pointer(void __user *fp)
336{
337	if (((unsigned long) fp) & 15)
338		return 1;
339	return 0;
340}
341
342static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
343{
344	unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
345
346	/*
347	 * If we are on the alternate signal stack and would overflow it, don't.
348	 * Return an always-bogus address instead so we will die with SIGSEGV.
349	 */
350	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
351		return (void __user *) -1L;
352
353	/* This is the X/Open sanctioned signal stack switching.  */
354	if (ka->sa.sa_flags & SA_ONSTACK) {
355		if (sas_ss_flags(sp) == 0)
356			sp = current->sas_ss_sp + current->sas_ss_size;
357	}
358
359	sp -= framesize;
360
361	/* Always align the stack frame.  This handles two cases.  First,
362	 * sigaltstack need not be mindful of platform specific stack
363	 * alignment.  Second, if we took this signal because the stack
364	 * is not aligned properly, we'd like to take the signal cleanly
365	 * and report that.
366	 */
367	sp &= ~15UL;
368
369	return (void __user *) sp;
370}
371
372static inline int
373setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
374	       int signo, sigset_t *oldset, siginfo_t *info)
375{
376	struct rt_signal_frame __user *sf;
377	int wsaved, err, sf_size;
378	void __user *tail;
379
380	/* 1. Make sure everything is clean */
381	synchronize_user_stack();
382	save_and_clear_fpu();
383	
384	wsaved = get_thread_wsaved();
385
386	sf_size = sizeof(struct rt_signal_frame);
387	if (current_thread_info()->fpsaved[0] & FPRS_FEF)
388		sf_size += sizeof(__siginfo_fpu_t);
389	if (wsaved)
390		sf_size += sizeof(__siginfo_rwin_t);
391	sf = (struct rt_signal_frame __user *)
392		get_sigframe(ka, regs, sf_size);
393
394	if (invalid_frame_pointer (sf))
395		goto sigill;
 
 
 
 
 
 
396
397	tail = (sf + 1);
398
399	/* 2. Save the current process state */
400	err = copy_to_user(&sf->regs, regs, sizeof (*regs));
401
402	if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
403		__siginfo_fpu_t __user *fpu_save = tail;
404		tail += sizeof(__siginfo_fpu_t);
405		err |= save_fpu_state(regs, fpu_save);
406		err |= __put_user((u64)fpu_save, &sf->fpu_save);
407	} else {
408		err |= __put_user(0, &sf->fpu_save);
409	}
410	if (wsaved) {
411		__siginfo_rwin_t __user *rwin_save = tail;
412		tail += sizeof(__siginfo_rwin_t);
413		err |= save_rwin_state(wsaved, rwin_save);
414		err |= __put_user((u64)rwin_save, &sf->rwin_save);
415		set_thread_wsaved(0);
416	} else {
417		err |= __put_user(0, &sf->rwin_save);
418	}
419	
420	/* Setup sigaltstack */
421	err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
422	err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
423	err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
424
425	err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
426
427	if (!wsaved) {
428		err |= copy_in_user((u64 __user *)sf,
429				    (u64 __user *)(regs->u_regs[UREG_FP] +
430						   STACK_BIAS),
431				    sizeof(struct reg_window));
432	} else {
433		struct reg_window *rp;
434
435		rp = &current_thread_info()->reg_window[wsaved - 1];
436		err |= copy_to_user(sf, rp, sizeof(struct reg_window));
437	}
438	if (info)
439		err |= copy_siginfo_to_user(&sf->info, info);
440	else {
441		err |= __put_user(signo, &sf->info.si_signo);
442		err |= __put_user(SI_NOINFO, &sf->info.si_code);
443	}
444	if (err)
445		goto sigsegv;
446	
447	/* 3. signal handler back-trampoline and parameters */
448	regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
449	regs->u_regs[UREG_I0] = signo;
450	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
451
452	/* The sigcontext is passed in this way because of how it
453	 * is defined in GLIBC's /usr/include/bits/sigcontext.h
454	 * for sparc64.  It includes the 128 bytes of siginfo_t.
455	 */
456	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
457
458	/* 5. signal handler */
459	regs->tpc = (unsigned long) 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	/* 4. return to kernel instructions */
466	regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
467	return 0;
468
469sigill:
470	do_exit(SIGILL);
471	return -EINVAL;
472
473sigsegv:
474	force_sigsegv(signo, current);
475	return -EFAULT;
476}
477
478static inline int handle_signal(unsigned long signr, struct k_sigaction *ka,
479				siginfo_t *info,
480				sigset_t *oldset, struct pt_regs *regs)
481{
482	sigset_t blocked;
483	int err;
484
485	err = setup_rt_frame(ka, regs, signr, oldset,
486			     (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
487	if (err)
488		return err;
489	sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
490	if (!(ka->sa.sa_flags & SA_NOMASK))
491		sigaddset(&blocked, signr);
492	set_current_blocked(&blocked);
493
494	tracehook_signal_handler(signr, info, ka, regs, 0);
495
496	return 0;
497}
498
499static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
500				   struct sigaction *sa)
501{
502	switch (regs->u_regs[UREG_I0]) {
503	case ERESTART_RESTARTBLOCK:
504	case ERESTARTNOHAND:
505	no_system_call_restart:
506		regs->u_regs[UREG_I0] = EINTR;
507		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
508		break;
509	case ERESTARTSYS:
510		if (!(sa->sa_flags & SA_RESTART))
511			goto no_system_call_restart;
512		/* fallthrough */
513	case ERESTARTNOINTR:
514		regs->u_regs[UREG_I0] = orig_i0;
515		regs->tpc -= 4;
516		regs->tnpc -= 4;
517	}
518}
519
520/* Note that 'init' is a special process: it doesn't get signals it doesn't
521 * want to handle. Thus you cannot kill init even with a SIGKILL even by
522 * mistake.
523 */
524static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
525{
526	struct k_sigaction ka;
527	int restart_syscall;
528	sigset_t *oldset;
529	siginfo_t info;
530	int signr;
531	
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
532	if (pt_regs_is_syscall(regs) &&
533	    (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
534		restart_syscall = 1;
535	} else
536		restart_syscall = 0;
537
538	if (current_thread_info()->status & TS_RESTORE_SIGMASK)
539		oldset = &current->saved_sigmask;
540	else
541		oldset = &current->blocked;
542
543#ifdef CONFIG_COMPAT
544	if (test_thread_flag(TIF_32BIT)) {
545		extern void do_signal32(sigset_t *, struct pt_regs *,
546					int restart_syscall,
547					unsigned long orig_i0);
548		do_signal32(oldset, regs, restart_syscall, orig_i0);
549		return;
550	}
551#endif	
552
553	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
554
555	/* If the debugger messes with the program counter, it clears
556	 * the software "in syscall" bit, directing us to not perform
557	 * a syscall restart.
558	 */
559	if (restart_syscall && !pt_regs_is_syscall(regs))
560		restart_syscall = 0;
561
562	if (signr > 0) {
563		if (restart_syscall)
564			syscall_restart(orig_i0, regs, &ka.sa);
565		if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
566			/* A signal was successfully delivered; the saved
567			 * sigmask will have been stored in the signal frame,
568			 * and will be restored by sigreturn, so we can simply
569			 * clear the TS_RESTORE_SIGMASK flag.
570			 */
571			current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 
 
 
 
 
 
 
 
 
 
 
 
572		}
573		return;
574	}
575	if (restart_syscall &&
576	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
577	     regs->u_regs[UREG_I0] == ERESTARTSYS ||
578	     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
579		/* replay the system call when we are done */
580		regs->u_regs[UREG_I0] = orig_i0;
581		regs->tpc -= 4;
582		regs->tnpc -= 4;
583		pt_regs_clear_syscall(regs);
584	}
585	if (restart_syscall &&
586	    regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
587		regs->u_regs[UREG_G1] = __NR_restart_syscall;
588		regs->tpc -= 4;
589		regs->tnpc -= 4;
590		pt_regs_clear_syscall(regs);
591	}
592
593	/* If there's no signal to deliver, we just put the saved sigmask
594	 * back
595	 */
596	if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
597		current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
598		set_current_blocked(&current->saved_sigmask);
599	}
600}
601
602void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
603{
604	if (thread_info_flags & _TIF_SIGPENDING)
 
 
 
605		do_signal(regs, orig_i0);
606	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
607		clear_thread_flag(TIF_NOTIFY_RESUME);
608		tracehook_notify_resume(regs);
609		if (current->replacement_session_keyring)
610			key_replace_session_keyring();
611	}
612}
613