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TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/signal32.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /*  arch/sparc64/kernel/signal32.c
  3  *
  4  *  Copyright (C) 1991, 1992  Linus Torvalds
  5  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
  6  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
  7  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
  8  *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
  9  */
 10 
 11 #include <linux/sched.h>
 12 #include <linux/kernel.h>
 13 #include <linux/signal.h>
 14 #include <linux/errno.h>
 15 #include <linux/wait.h>
 16 #include <linux/ptrace.h>
 17 #include <linux/unistd.h>
 18 #include <linux/mm.h>
 19 #include <linux/tty.h>
 20 #include <linux/binfmts.h>
 21 #include <linux/compat.h>
 22 #include <linux/bitops.h>
 23 #include <linux/tracehook.h>
 24 
 25 #include <linux/uaccess.h>
 26 #include <asm/ptrace.h>
 27 #include <asm/pgtable.h>
 28 #include <asm/psrcompat.h>
 29 #include <asm/fpumacro.h>
 30 #include <asm/visasm.h>
 31 #include <asm/compat_signal.h>
 32 #include <asm/switch_to.h>
 33 
 34 #include "sigutil.h"
 35 #include "kernel.h"
 36 
 37 /* This magic should be in g_upper[0] for all upper parts
 38  * to be valid.
 39  */
 40 #define SIGINFO_EXTRA_V8PLUS_MAGIC      0x130e269
 41 typedef struct {
 42         unsigned int g_upper[8];
 43         unsigned int o_upper[8];
 44         unsigned int asi;
 45 } siginfo_extra_v8plus_t;
 46 
 47 struct signal_frame32 {
 48         struct sparc_stackf32   ss;
 49         __siginfo32_t           info;
 50         /* __siginfo_fpu_t * */ u32 fpu_save;
 51         unsigned int            insns[2];
 52         unsigned int            extramask[_COMPAT_NSIG_WORDS - 1];
 53         unsigned int            extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
 54         /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
 55         siginfo_extra_v8plus_t  v8plus;
 56         /* __siginfo_rwin_t * */u32 rwin_save;
 57 } __attribute__((aligned(8)));
 58 
 59 struct rt_signal_frame32 {
 60         struct sparc_stackf32   ss;
 61         compat_siginfo_t        info;
 62         struct pt_regs32        regs;
 63         compat_sigset_t         mask;
 64         /* __siginfo_fpu_t * */ u32 fpu_save;
 65         unsigned int            insns[2];
 66         compat_stack_t          stack;
 67         unsigned int            extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
 68         /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
 69         siginfo_extra_v8plus_t  v8plus;
 70         /* __siginfo_rwin_t * */u32 rwin_save;
 71 } __attribute__((aligned(8)));
 72 
 73 /* Checks if the fp is valid.  We always build signal frames which are
 74  * 16-byte aligned, therefore we can always enforce that the restore
 75  * frame has that property as well.
 76  */
 77 static bool invalid_frame_pointer(void __user *fp, int fplen)
 78 {
 79         if ((((unsigned long) fp) & 15) ||
 80             ((unsigned long)fp) > 0x100000000ULL - fplen)
 81                 return true;
 82         return false;
 83 }
 84 
 85 void do_sigreturn32(struct pt_regs *regs)
 86 {
 87         struct signal_frame32 __user *sf;
 88         compat_uptr_t fpu_save;
 89         compat_uptr_t rwin_save;
 90         unsigned int psr, ufp;
 91         unsigned int pc, npc;
 92         sigset_t set;
 93         compat_sigset_t seta;
 94         int err, i;
 95         
 96         /* Always make any pending restarted system calls return -EINTR */
 97         current->restart_block.fn = do_no_restart_syscall;
 98 
 99         synchronize_user_stack();
100 
101         regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
102         sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
103 
104         /* 1. Make sure we are not getting garbage from the user */
105         if (invalid_frame_pointer(sf, sizeof(*sf)))
106                 goto segv;
107 
108         if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
109                 goto segv;
110 
111         if (ufp & 0x7)
112                 goto segv;
113 
114         if (__get_user(pc, &sf->info.si_regs.pc) ||
115             __get_user(npc, &sf->info.si_regs.npc))
116                 goto segv;
117 
118         if ((pc | npc) & 3)
119                 goto segv;
120 
121         if (test_thread_flag(TIF_32BIT)) {
122                 pc &= 0xffffffff;
123                 npc &= 0xffffffff;
124         }
125         regs->tpc = pc;
126         regs->tnpc = npc;
127 
128         /* 2. Restore the state */
129         err = __get_user(regs->y, &sf->info.si_regs.y);
130         err |= __get_user(psr, &sf->info.si_regs.psr);
131 
132         for (i = UREG_G1; i <= UREG_I7; i++)
133                 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
134         if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
135                 err |= __get_user(i, &sf->v8plus.g_upper[0]);
136                 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
137                         unsigned long asi;
138 
139                         for (i = UREG_G1; i <= UREG_I7; i++)
140                                 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
141                         err |= __get_user(asi, &sf->v8plus.asi);
142                         regs->tstate &= ~TSTATE_ASI;
143                         regs->tstate |= ((asi & 0xffUL) << 24UL);
144                 }
145         }
146 
147         /* User can only change condition codes in %tstate. */
148         regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
149         regs->tstate |= psr_to_tstate_icc(psr);
150 
151         /* Prevent syscall restart.  */
152         pt_regs_clear_syscall(regs);
153 
154         err |= __get_user(fpu_save, &sf->fpu_save);
155         if (!err && fpu_save)
156                 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
157         err |= __get_user(rwin_save, &sf->rwin_save);
158         if (!err && rwin_save) {
159                 if (restore_rwin_state(compat_ptr(rwin_save)))
160                         goto segv;
161         }
162         err |= __get_user(seta.sig[0], &sf->info.si_mask);
163         err |= copy_from_user(&seta.sig[1], &sf->extramask,
164                               (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
165         if (err)
166                 goto segv;
167 
168         set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
169         set_current_blocked(&set);
170         return;
171 
172 segv:
173         force_sig(SIGSEGV);
174 }
175 
176 asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
177 {
178         struct rt_signal_frame32 __user *sf;
179         unsigned int psr, pc, npc, ufp;
180         compat_uptr_t fpu_save;
181         compat_uptr_t rwin_save;
182         sigset_t set;
183         int err, i;
184         
185         /* Always make any pending restarted system calls return -EINTR */
186         current->restart_block.fn = do_no_restart_syscall;
187 
188         synchronize_user_stack();
189         regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
190         sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
191 
192         /* 1. Make sure we are not getting garbage from the user */
193         if (invalid_frame_pointer(sf, sizeof(*sf)))
194                 goto segv;
195 
196         if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
197                 goto segv;
198 
199         if (ufp & 0x7)
200                 goto segv;
201 
202         if (__get_user(pc, &sf->regs.pc) || 
203             __get_user(npc, &sf->regs.npc))
204                 goto segv;
205 
206         if ((pc | npc) & 3)
207                 goto segv;
208 
209         if (test_thread_flag(TIF_32BIT)) {
210                 pc &= 0xffffffff;
211                 npc &= 0xffffffff;
212         }
213         regs->tpc = pc;
214         regs->tnpc = npc;
215 
216         /* 2. Restore the state */
217         err = __get_user(regs->y, &sf->regs.y);
218         err |= __get_user(psr, &sf->regs.psr);
219         
220         for (i = UREG_G1; i <= UREG_I7; i++)
221                 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
222         if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
223                 err |= __get_user(i, &sf->v8plus.g_upper[0]);
224                 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
225                         unsigned long asi;
226 
227                         for (i = UREG_G1; i <= UREG_I7; i++)
228                                 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
229                         err |= __get_user(asi, &sf->v8plus.asi);
230                         regs->tstate &= ~TSTATE_ASI;
231                         regs->tstate |= ((asi & 0xffUL) << 24UL);
232                 }
233         }
234 
235         /* User can only change condition codes in %tstate. */
236         regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
237         regs->tstate |= psr_to_tstate_icc(psr);
238 
239         /* Prevent syscall restart.  */
240         pt_regs_clear_syscall(regs);
241 
242         err |= __get_user(fpu_save, &sf->fpu_save);
243         if (!err && fpu_save)
244                 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
245         err |= get_compat_sigset(&set, &sf->mask);
246         err |= compat_restore_altstack(&sf->stack);
247         if (err)
248                 goto segv;
249                 
250         err |= __get_user(rwin_save, &sf->rwin_save);
251         if (!err && rwin_save) {
252                 if (restore_rwin_state(compat_ptr(rwin_save)))
253                         goto segv;
254         }
255 
256         set_current_blocked(&set);
257         return;
258 segv:
259         force_sig(SIGSEGV);
260 }
261 
262 static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
263 {
264         unsigned long sp;
265         
266         regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
267         sp = regs->u_regs[UREG_FP];
268         
269         /*
270          * If we are on the alternate signal stack and would overflow it, don't.
271          * Return an always-bogus address instead so we will die with SIGSEGV.
272          */
273         if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
274                 return (void __user *) -1L;
275 
276         /* This is the X/Open sanctioned signal stack switching.  */
277         sp = sigsp(sp, ksig) - framesize;
278 
279         /* Always align the stack frame.  This handles two cases.  First,
280          * sigaltstack need not be mindful of platform specific stack
281          * alignment.  Second, if we took this signal because the stack
282          * is not aligned properly, we'd like to take the signal cleanly
283          * and report that.
284          */
285         sp &= ~15UL;
286 
287         return (void __user *) sp;
288 }
289 
290 /* The I-cache flush instruction only works in the primary ASI, which
291  * right now is the nucleus, aka. kernel space.
292  *
293  * Therefore we have to kick the instructions out using the kernel
294  * side linear mapping of the physical address backing the user
295  * instructions.
296  */
297 static void flush_signal_insns(unsigned long address)
298 {
299         unsigned long pstate, paddr;
300         pte_t *ptep, pte;
301         pgd_t *pgdp;
302         pud_t *pudp;
303         pmd_t *pmdp;
304 
305         /* Commit all stores of the instructions we are about to flush.  */
306         wmb();
307 
308         /* Disable cross-call reception.  In this way even a very wide
309          * munmap() on another cpu can't tear down the page table
310          * hierarchy from underneath us, since that can't complete
311          * until the IPI tlb flush returns.
312          */
313 
314         __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
315         __asm__ __volatile__("wrpr %0, %1, %%pstate"
316                                 : : "r" (pstate), "i" (PSTATE_IE));
317 
318         pgdp = pgd_offset(current->mm, address);
319         if (pgd_none(*pgdp))
320                 goto out_irqs_on;
321         pudp = pud_offset(pgdp, address);
322         if (pud_none(*pudp))
323                 goto out_irqs_on;
324         pmdp = pmd_offset(pudp, address);
325         if (pmd_none(*pmdp))
326                 goto out_irqs_on;
327 
328         ptep = pte_offset_map(pmdp, address);
329         pte = *ptep;
330         if (!pte_present(pte))
331                 goto out_unmap;
332 
333         paddr = (unsigned long) page_address(pte_page(pte));
334 
335         __asm__ __volatile__("flush     %0 + %1"
336                              : /* no outputs */
337                              : "r" (paddr),
338                                "r" (address & (PAGE_SIZE - 1))
339                              : "memory");
340 
341 out_unmap:
342         pte_unmap(ptep);
343 out_irqs_on:
344         __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
345 
346 }
347 
348 static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
349                          sigset_t *oldset)
350 {
351         struct signal_frame32 __user *sf;
352         int i, err, wsaved;
353         void __user *tail;
354         int sigframe_size;
355         u32 psr;
356         compat_sigset_t seta;
357 
358         /* 1. Make sure everything is clean */
359         synchronize_user_stack();
360         save_and_clear_fpu();
361         
362         wsaved = get_thread_wsaved();
363 
364         sigframe_size = sizeof(*sf);
365         if (current_thread_info()->fpsaved[0] & FPRS_FEF)
366                 sigframe_size += sizeof(__siginfo_fpu_t);
367         if (wsaved)
368                 sigframe_size += sizeof(__siginfo_rwin_t);
369 
370         sf = (struct signal_frame32 __user *)
371                 get_sigframe(ksig, regs, sigframe_size);
372         
373         if (invalid_frame_pointer(sf, sigframe_size)) {
374                 if (show_unhandled_signals)
375                         pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
376                                 current->comm, current->pid, (unsigned long)sf,
377                                 regs->tpc, regs->u_regs[UREG_I7]);
378                 force_sigsegv(ksig->sig);
379                 return -EINVAL;
380         }
381 
382         tail = (sf + 1);
383 
384         /* 2. Save the current process state */
385         if (test_thread_flag(TIF_32BIT)) {
386                 regs->tpc &= 0xffffffff;
387                 regs->tnpc &= 0xffffffff;
388         }
389         err  = put_user(regs->tpc, &sf->info.si_regs.pc);
390         err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
391         err |= __put_user(regs->y, &sf->info.si_regs.y);
392         psr = tstate_to_psr(regs->tstate);
393         if (current_thread_info()->fpsaved[0] & FPRS_FEF)
394                 psr |= PSR_EF;
395         err |= __put_user(psr, &sf->info.si_regs.psr);
396         for (i = 0; i < 16; i++)
397                 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
398         err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
399         err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
400         for (i = 1; i < 16; i++)
401                 err |= __put_user(((u32 *)regs->u_regs)[2*i],
402                                   &sf->v8plus.g_upper[i]);
403         err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
404                           &sf->v8plus.asi);
405 
406         if (psr & PSR_EF) {
407                 __siginfo_fpu_t __user *fp = tail;
408                 tail += sizeof(*fp);
409                 err |= save_fpu_state(regs, fp);
410                 err |= __put_user((u64)fp, &sf->fpu_save);
411         } else {
412                 err |= __put_user(0, &sf->fpu_save);
413         }
414         if (wsaved) {
415                 __siginfo_rwin_t __user *rwp = tail;
416                 tail += sizeof(*rwp);
417                 err |= save_rwin_state(wsaved, rwp);
418                 err |= __put_user((u64)rwp, &sf->rwin_save);
419                 set_thread_wsaved(0);
420         } else {
421                 err |= __put_user(0, &sf->rwin_save);
422         }
423 
424         /* If these change we need to know - assignments to seta relies on these sizes */
425         BUILD_BUG_ON(_NSIG_WORDS != 1);
426         BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
427         seta.sig[1] = (oldset->sig[0] >> 32);
428         seta.sig[0] = oldset->sig[0];
429 
430         err |= __put_user(seta.sig[0], &sf->info.si_mask);
431         err |= __copy_to_user(sf->extramask, &seta.sig[1],
432                               (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
433 
434         if (!wsaved) {
435                 err |= copy_in_user((u32 __user *)sf,
436                                     (u32 __user *)(regs->u_regs[UREG_FP]),
437                                     sizeof(struct reg_window32));
438         } else {
439                 struct reg_window *rp;
440 
441                 rp = &current_thread_info()->reg_window[wsaved - 1];
442                 for (i = 0; i < 8; i++)
443                         err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
444                 for (i = 0; i < 6; i++)
445                         err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
446                 err |= __put_user(rp->ins[6], &sf->ss.fp);
447                 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
448         }       
449         if (err)
450                 return err;
451 
452         /* 3. signal handler back-trampoline and parameters */
453         regs->u_regs[UREG_FP] = (unsigned long) sf;
454         regs->u_regs[UREG_I0] = ksig->sig;
455         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
456         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
457 
458         /* 4. signal handler */
459         regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
460         regs->tnpc = (regs->tpc + 4);
461         if (test_thread_flag(TIF_32BIT)) {
462                 regs->tpc &= 0xffffffff;
463                 regs->tnpc &= 0xffffffff;
464         }
465 
466         /* 5. return to kernel instructions */
467         if (ksig->ka.ka_restorer) {
468                 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
469         } else {
470                 unsigned long address = ((unsigned long)&(sf->insns[0]));
471 
472                 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
473         
474                 err  = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
475                 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
476                 if (err)
477                         return err;
478                 flush_signal_insns(address);
479         }
480         return 0;
481 }
482 
483 static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
484                             sigset_t *oldset)
485 {
486         struct rt_signal_frame32 __user *sf;
487         int i, err, wsaved;
488         void __user *tail;
489         int sigframe_size;
490         u32 psr;
491 
492         /* 1. Make sure everything is clean */
493         synchronize_user_stack();
494         save_and_clear_fpu();
495         
496         wsaved = get_thread_wsaved();
497 
498         sigframe_size = sizeof(*sf);
499         if (current_thread_info()->fpsaved[0] & FPRS_FEF)
500                 sigframe_size += sizeof(__siginfo_fpu_t);
501         if (wsaved)
502                 sigframe_size += sizeof(__siginfo_rwin_t);
503 
504         sf = (struct rt_signal_frame32 __user *)
505                 get_sigframe(ksig, regs, sigframe_size);
506         
507         if (invalid_frame_pointer(sf, sigframe_size)) {
508                 if (show_unhandled_signals)
509                         pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
510                                 current->comm, current->pid, (unsigned long)sf,
511                                 regs->tpc, regs->u_regs[UREG_I7]);
512                 force_sigsegv(ksig->sig);
513                 return -EINVAL;
514         }
515 
516         tail = (sf + 1);
517 
518         /* 2. Save the current process state */
519         if (test_thread_flag(TIF_32BIT)) {
520                 regs->tpc &= 0xffffffff;
521                 regs->tnpc &= 0xffffffff;
522         }
523         err  = put_user(regs->tpc, &sf->regs.pc);
524         err |= __put_user(regs->tnpc, &sf->regs.npc);
525         err |= __put_user(regs->y, &sf->regs.y);
526         psr = tstate_to_psr(regs->tstate);
527         if (current_thread_info()->fpsaved[0] & FPRS_FEF)
528                 psr |= PSR_EF;
529         err |= __put_user(psr, &sf->regs.psr);
530         for (i = 0; i < 16; i++)
531                 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
532         err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
533         err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
534         for (i = 1; i < 16; i++)
535                 err |= __put_user(((u32 *)regs->u_regs)[2*i],
536                                   &sf->v8plus.g_upper[i]);
537         err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
538                           &sf->v8plus.asi);
539 
540         if (psr & PSR_EF) {
541                 __siginfo_fpu_t __user *fp = tail;
542                 tail += sizeof(*fp);
543                 err |= save_fpu_state(regs, fp);
544                 err |= __put_user((u64)fp, &sf->fpu_save);
545         } else {
546                 err |= __put_user(0, &sf->fpu_save);
547         }
548         if (wsaved) {
549                 __siginfo_rwin_t __user *rwp = tail;
550                 tail += sizeof(*rwp);
551                 err |= save_rwin_state(wsaved, rwp);
552                 err |= __put_user((u64)rwp, &sf->rwin_save);
553                 set_thread_wsaved(0);
554         } else {
555                 err |= __put_user(0, &sf->rwin_save);
556         }
557 
558         /* Update the siginfo structure.  */
559         err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
560         
561         /* Setup sigaltstack */
562         err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
563 
564         err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t));
565 
566         if (!wsaved) {
567                 err |= copy_in_user((u32 __user *)sf,
568                                     (u32 __user *)(regs->u_regs[UREG_FP]),
569                                     sizeof(struct reg_window32));
570         } else {
571                 struct reg_window *rp;
572 
573                 rp = &current_thread_info()->reg_window[wsaved - 1];
574                 for (i = 0; i < 8; i++)
575                         err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
576                 for (i = 0; i < 6; i++)
577                         err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
578                 err |= __put_user(rp->ins[6], &sf->ss.fp);
579                 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
580         }
581         if (err)
582                 return err;
583         
584         /* 3. signal handler back-trampoline and parameters */
585         regs->u_regs[UREG_FP] = (unsigned long) sf;
586         regs->u_regs[UREG_I0] = ksig->sig;
587         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
588         regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
589 
590         /* 4. signal handler */
591         regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
592         regs->tnpc = (regs->tpc + 4);
593         if (test_thread_flag(TIF_32BIT)) {
594                 regs->tpc &= 0xffffffff;
595                 regs->tnpc &= 0xffffffff;
596         }
597 
598         /* 5. return to kernel instructions */
599         if (ksig->ka.ka_restorer)
600                 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
601         else {
602                 unsigned long address = ((unsigned long)&(sf->insns[0]));
603 
604                 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
605         
606                 /* mov __NR_rt_sigreturn, %g1 */
607                 err |= __put_user(0x82102065, &sf->insns[0]);
608 
609                 /* t 0x10 */
610                 err |= __put_user(0x91d02010, &sf->insns[1]);
611                 if (err)
612                         return err;
613 
614                 flush_signal_insns(address);
615         }
616         return 0;
617 }
618 
619 static inline void handle_signal32(struct ksignal *ksig, 
620                                   struct pt_regs *regs)
621 {
622         sigset_t *oldset = sigmask_to_save();
623         int err;
624 
625         if (ksig->ka.sa.sa_flags & SA_SIGINFO)
626                 err = setup_rt_frame32(ksig, regs, oldset);
627         else
628                 err = setup_frame32(ksig, regs, oldset);
629 
630         signal_setup_done(err, ksig, 0);
631 }
632 
633 static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
634                                      struct sigaction *sa)
635 {
636         switch (regs->u_regs[UREG_I0]) {
637         case ERESTART_RESTARTBLOCK:
638         case ERESTARTNOHAND:
639         no_system_call_restart:
640                 regs->u_regs[UREG_I0] = EINTR;
641                 regs->tstate |= TSTATE_ICARRY;
642                 break;
643         case ERESTARTSYS:
644                 if (!(sa->sa_flags & SA_RESTART))
645                         goto no_system_call_restart;
646                 /* fallthrough */
647         case ERESTARTNOINTR:
648                 regs->u_regs[UREG_I0] = orig_i0;
649                 regs->tpc -= 4;
650                 regs->tnpc -= 4;
651         }
652 }
653 
654 /* Note that 'init' is a special process: it doesn't get signals it doesn't
655  * want to handle. Thus you cannot kill init even with a SIGKILL even by
656  * mistake.
657  */
658 void do_signal32(struct pt_regs * regs)
659 {
660         struct ksignal ksig;
661         unsigned long orig_i0 = 0;
662         int restart_syscall = 0;
663         bool has_handler = get_signal(&ksig);
664 
665         if (pt_regs_is_syscall(regs) &&
666             (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
667                 restart_syscall = 1;
668                 orig_i0 = regs->u_regs[UREG_G6];
669         }
670 
671         if (has_handler) {
672                 if (restart_syscall)
673                         syscall_restart32(orig_i0, regs, &ksig.ka.sa);
674                 handle_signal32(&ksig, regs);
675         } else {
676                 if (restart_syscall) {
677                         switch (regs->u_regs[UREG_I0]) {
678                         case ERESTARTNOHAND:
679                         case ERESTARTSYS:
680                         case ERESTARTNOINTR:
681                                 /* replay the system call when we are done */
682                                 regs->u_regs[UREG_I0] = orig_i0;
683                                 regs->tpc -= 4;
684                                 regs->tnpc -= 4;
685                                 pt_regs_clear_syscall(regs);
686                                 /* fall through */
687                         case ERESTART_RESTARTBLOCK:
688                                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
689                                 regs->tpc -= 4;
690                                 regs->tnpc -= 4;
691                                 pt_regs_clear_syscall(regs);
692                         }
693                 }
694                 restore_saved_sigmask();
695         }
696 }
697 
698 struct sigstack32 {
699         u32 the_stack;
700         int cur_status;
701 };
702 
703 asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
704 {
705         struct sigstack32 __user *ssptr =
706                 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
707         struct sigstack32 __user *ossptr =
708                 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
709         int ret = -EFAULT;
710 
711         /* First see if old state is wanted. */
712         if (ossptr) {
713                 if (put_user(current->sas_ss_sp + current->sas_ss_size,
714                              &ossptr->the_stack) ||
715                     __put_user(on_sig_stack(sp), &ossptr->cur_status))
716                         goto out;
717         }
718         
719         /* Now see if we want to update the new state. */
720         if (ssptr) {
721                 u32 ss_sp;
722 
723                 if (get_user(ss_sp, &ssptr->the_stack))
724                         goto out;
725 
726                 /* If the current stack was set with sigaltstack, don't
727                  * swap stacks while we are on it.
728                  */
729                 ret = -EPERM;
730                 if (current->sas_ss_sp && on_sig_stack(sp))
731                         goto out;
732                         
733                 /* Since we don't know the extent of the stack, and we don't
734                  * track onstack-ness, but rather calculate it, we must
735                  * presume a size.  Ho hum this interface is lossy.
736                  */
737                 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
738                 current->sas_ss_size = SIGSTKSZ;
739         }
740         
741         ret = 0;
742 out:
743         return ret;
744 }
745 

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