x86/efi: Enforce CONFIG_RELOCATABLE for EFI boot stub
[linux/fpc-iii.git] / arch / sparc / kernel / signal32.c
blobb524f91dd0e51ad4a09119759c403843b9a7e3f9
1 /* arch/sparc64/kernel/signal32.c
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
6 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 */
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
12 #include <linux/signal.h>
13 #include <linux/errno.h>
14 #include <linux/wait.h>
15 #include <linux/ptrace.h>
16 #include <linux/unistd.h>
17 #include <linux/mm.h>
18 #include <linux/tty.h>
19 #include <linux/binfmts.h>
20 #include <linux/compat.h>
21 #include <linux/bitops.h>
22 #include <linux/tracehook.h>
24 #include <asm/uaccess.h>
25 #include <asm/ptrace.h>
26 #include <asm/pgtable.h>
27 #include <asm/psrcompat.h>
28 #include <asm/fpumacro.h>
29 #include <asm/visasm.h>
30 #include <asm/compat_signal.h>
31 #include <asm/switch_to.h>
33 #include "sigutil.h"
35 /* This magic should be in g_upper[0] for all upper parts
36 * to be valid.
38 #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
39 typedef struct {
40 unsigned int g_upper[8];
41 unsigned int o_upper[8];
42 unsigned int asi;
43 } siginfo_extra_v8plus_t;
45 struct signal_frame32 {
46 struct sparc_stackf32 ss;
47 __siginfo32_t info;
48 /* __siginfo_fpu_t * */ u32 fpu_save;
49 unsigned int insns[2];
50 unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
51 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
52 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
53 siginfo_extra_v8plus_t v8plus;
54 /* __siginfo_rwin_t * */u32 rwin_save;
55 } __attribute__((aligned(8)));
57 struct rt_signal_frame32 {
58 struct sparc_stackf32 ss;
59 compat_siginfo_t info;
60 struct pt_regs32 regs;
61 compat_sigset_t mask;
62 /* __siginfo_fpu_t * */ u32 fpu_save;
63 unsigned int insns[2];
64 compat_stack_t stack;
65 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
66 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
67 siginfo_extra_v8plus_t v8plus;
68 /* __siginfo_rwin_t * */u32 rwin_save;
69 } __attribute__((aligned(8)));
71 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
73 int err;
75 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
76 return -EFAULT;
78 /* If you change siginfo_t structure, please be sure
79 this code is fixed accordingly.
80 It should never copy any pad contained in the structure
81 to avoid security leaks, but must copy the generic
82 3 ints plus the relevant union member.
83 This routine must convert siginfo from 64bit to 32bit as well
84 at the same time. */
85 err = __put_user(from->si_signo, &to->si_signo);
86 err |= __put_user(from->si_errno, &to->si_errno);
87 err |= __put_user((short)from->si_code, &to->si_code);
88 if (from->si_code < 0)
89 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
90 else {
91 switch (from->si_code >> 16) {
92 case __SI_TIMER >> 16:
93 err |= __put_user(from->si_tid, &to->si_tid);
94 err |= __put_user(from->si_overrun, &to->si_overrun);
95 err |= __put_user(from->si_int, &to->si_int);
96 break;
97 case __SI_CHLD >> 16:
98 err |= __put_user(from->si_utime, &to->si_utime);
99 err |= __put_user(from->si_stime, &to->si_stime);
100 err |= __put_user(from->si_status, &to->si_status);
101 default:
102 err |= __put_user(from->si_pid, &to->si_pid);
103 err |= __put_user(from->si_uid, &to->si_uid);
104 break;
105 case __SI_FAULT >> 16:
106 err |= __put_user(from->si_trapno, &to->si_trapno);
107 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
108 break;
109 case __SI_POLL >> 16:
110 err |= __put_user(from->si_band, &to->si_band);
111 err |= __put_user(from->si_fd, &to->si_fd);
112 break;
113 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
114 case __SI_MESGQ >> 16:
115 err |= __put_user(from->si_pid, &to->si_pid);
116 err |= __put_user(from->si_uid, &to->si_uid);
117 err |= __put_user(from->si_int, &to->si_int);
118 break;
121 return err;
124 /* CAUTION: This is just a very minimalist implementation for the
125 * sake of compat_sys_rt_sigqueueinfo()
127 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
129 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
130 return -EFAULT;
132 if (copy_from_user(to, from, 3*sizeof(int)) ||
133 copy_from_user(to->_sifields._pad, from->_sifields._pad,
134 SI_PAD_SIZE))
135 return -EFAULT;
137 return 0;
140 void do_sigreturn32(struct pt_regs *regs)
142 struct signal_frame32 __user *sf;
143 compat_uptr_t fpu_save;
144 compat_uptr_t rwin_save;
145 unsigned int psr;
146 unsigned pc, npc;
147 sigset_t set;
148 unsigned seta[_COMPAT_NSIG_WORDS];
149 int err, i;
151 /* Always make any pending restarted system calls return -EINTR */
152 current_thread_info()->restart_block.fn = do_no_restart_syscall;
154 synchronize_user_stack();
156 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
157 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
159 /* 1. Make sure we are not getting garbage from the user */
160 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
161 (((unsigned long) sf) & 3))
162 goto segv;
164 if (get_user(pc, &sf->info.si_regs.pc) ||
165 __get_user(npc, &sf->info.si_regs.npc))
166 goto segv;
168 if ((pc | npc) & 3)
169 goto segv;
171 if (test_thread_flag(TIF_32BIT)) {
172 pc &= 0xffffffff;
173 npc &= 0xffffffff;
175 regs->tpc = pc;
176 regs->tnpc = npc;
178 /* 2. Restore the state */
179 err = __get_user(regs->y, &sf->info.si_regs.y);
180 err |= __get_user(psr, &sf->info.si_regs.psr);
182 for (i = UREG_G1; i <= UREG_I7; i++)
183 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
184 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
185 err |= __get_user(i, &sf->v8plus.g_upper[0]);
186 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
187 unsigned long asi;
189 for (i = UREG_G1; i <= UREG_I7; i++)
190 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
191 err |= __get_user(asi, &sf->v8plus.asi);
192 regs->tstate &= ~TSTATE_ASI;
193 regs->tstate |= ((asi & 0xffUL) << 24UL);
197 /* User can only change condition codes in %tstate. */
198 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
199 regs->tstate |= psr_to_tstate_icc(psr);
201 /* Prevent syscall restart. */
202 pt_regs_clear_syscall(regs);
204 err |= __get_user(fpu_save, &sf->fpu_save);
205 if (!err && fpu_save)
206 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
207 err |= __get_user(rwin_save, &sf->rwin_save);
208 if (!err && rwin_save) {
209 if (restore_rwin_state(compat_ptr(rwin_save)))
210 goto segv;
212 err |= __get_user(seta[0], &sf->info.si_mask);
213 err |= copy_from_user(seta+1, &sf->extramask,
214 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
215 if (err)
216 goto segv;
217 switch (_NSIG_WORDS) {
218 case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
219 case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
220 case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
221 case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
223 set_current_blocked(&set);
224 return;
226 segv:
227 force_sig(SIGSEGV, current);
230 asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
232 struct rt_signal_frame32 __user *sf;
233 unsigned int psr, pc, npc;
234 compat_uptr_t fpu_save;
235 compat_uptr_t rwin_save;
236 sigset_t set;
237 compat_sigset_t seta;
238 int err, i;
240 /* Always make any pending restarted system calls return -EINTR */
241 current_thread_info()->restart_block.fn = do_no_restart_syscall;
243 synchronize_user_stack();
244 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
245 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
247 /* 1. Make sure we are not getting garbage from the user */
248 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
249 (((unsigned long) sf) & 3))
250 goto segv;
252 if (get_user(pc, &sf->regs.pc) ||
253 __get_user(npc, &sf->regs.npc))
254 goto segv;
256 if ((pc | npc) & 3)
257 goto segv;
259 if (test_thread_flag(TIF_32BIT)) {
260 pc &= 0xffffffff;
261 npc &= 0xffffffff;
263 regs->tpc = pc;
264 regs->tnpc = npc;
266 /* 2. Restore the state */
267 err = __get_user(regs->y, &sf->regs.y);
268 err |= __get_user(psr, &sf->regs.psr);
270 for (i = UREG_G1; i <= UREG_I7; i++)
271 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
272 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
273 err |= __get_user(i, &sf->v8plus.g_upper[0]);
274 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
275 unsigned long asi;
277 for (i = UREG_G1; i <= UREG_I7; i++)
278 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
279 err |= __get_user(asi, &sf->v8plus.asi);
280 regs->tstate &= ~TSTATE_ASI;
281 regs->tstate |= ((asi & 0xffUL) << 24UL);
285 /* User can only change condition codes in %tstate. */
286 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
287 regs->tstate |= psr_to_tstate_icc(psr);
289 /* Prevent syscall restart. */
290 pt_regs_clear_syscall(regs);
292 err |= __get_user(fpu_save, &sf->fpu_save);
293 if (!err && fpu_save)
294 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
295 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
296 err |= compat_restore_altstack(&sf->stack);
297 if (err)
298 goto segv;
300 err |= __get_user(rwin_save, &sf->rwin_save);
301 if (!err && rwin_save) {
302 if (restore_rwin_state(compat_ptr(rwin_save)))
303 goto segv;
306 switch (_NSIG_WORDS) {
307 case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32);
308 case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32);
309 case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32);
310 case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
312 set_current_blocked(&set);
313 return;
314 segv:
315 force_sig(SIGSEGV, current);
318 /* Checks if the fp is valid */
319 static int invalid_frame_pointer(void __user *fp, int fplen)
321 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
322 return 1;
323 return 0;
326 static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
328 unsigned long sp;
330 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
331 sp = regs->u_regs[UREG_FP];
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
347 * and report that.
349 sp &= ~15UL;
351 return (void __user *) sp;
354 /* The I-cache flush instruction only works in the primary ASI, which
355 * right now is the nucleus, aka. kernel space.
357 * Therefore we have to kick the instructions out using the kernel
358 * side linear mapping of the physical address backing the user
359 * instructions.
361 static void flush_signal_insns(unsigned long address)
363 unsigned long pstate, paddr;
364 pte_t *ptep, pte;
365 pgd_t *pgdp;
366 pud_t *pudp;
367 pmd_t *pmdp;
369 /* Commit all stores of the instructions we are about to flush. */
370 wmb();
372 /* Disable cross-call reception. In this way even a very wide
373 * munmap() on another cpu can't tear down the page table
374 * hierarchy from underneath us, since that can't complete
375 * until the IPI tlb flush returns.
378 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
379 __asm__ __volatile__("wrpr %0, %1, %%pstate"
380 : : "r" (pstate), "i" (PSTATE_IE));
382 pgdp = pgd_offset(current->mm, address);
383 if (pgd_none(*pgdp))
384 goto out_irqs_on;
385 pudp = pud_offset(pgdp, address);
386 if (pud_none(*pudp))
387 goto out_irqs_on;
388 pmdp = pmd_offset(pudp, address);
389 if (pmd_none(*pmdp))
390 goto out_irqs_on;
392 ptep = pte_offset_map(pmdp, address);
393 pte = *ptep;
394 if (!pte_present(pte))
395 goto out_unmap;
397 paddr = (unsigned long) page_address(pte_page(pte));
399 __asm__ __volatile__("flush %0 + %1"
400 : /* no outputs */
401 : "r" (paddr),
402 "r" (address & (PAGE_SIZE - 1))
403 : "memory");
405 out_unmap:
406 pte_unmap(ptep);
407 out_irqs_on:
408 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
412 static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
413 sigset_t *oldset)
415 struct signal_frame32 __user *sf;
416 int i, err, wsaved;
417 void __user *tail;
418 int sigframe_size;
419 u32 psr;
420 unsigned int seta[_COMPAT_NSIG_WORDS];
422 /* 1. Make sure everything is clean */
423 synchronize_user_stack();
424 save_and_clear_fpu();
426 wsaved = get_thread_wsaved();
428 sigframe_size = sizeof(*sf);
429 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
430 sigframe_size += sizeof(__siginfo_fpu_t);
431 if (wsaved)
432 sigframe_size += sizeof(__siginfo_rwin_t);
434 sf = (struct signal_frame32 __user *)
435 get_sigframe(ksig, regs, sigframe_size);
437 if (invalid_frame_pointer(sf, sigframe_size)) {
438 do_exit(SIGILL);
439 return -EINVAL;
442 tail = (sf + 1);
444 /* 2. Save the current process state */
445 if (test_thread_flag(TIF_32BIT)) {
446 regs->tpc &= 0xffffffff;
447 regs->tnpc &= 0xffffffff;
449 err = put_user(regs->tpc, &sf->info.si_regs.pc);
450 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
451 err |= __put_user(regs->y, &sf->info.si_regs.y);
452 psr = tstate_to_psr(regs->tstate);
453 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
454 psr |= PSR_EF;
455 err |= __put_user(psr, &sf->info.si_regs.psr);
456 for (i = 0; i < 16; i++)
457 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
458 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
459 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
460 for (i = 1; i < 16; i++)
461 err |= __put_user(((u32 *)regs->u_regs)[2*i],
462 &sf->v8plus.g_upper[i]);
463 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
464 &sf->v8plus.asi);
466 if (psr & PSR_EF) {
467 __siginfo_fpu_t __user *fp = tail;
468 tail += sizeof(*fp);
469 err |= save_fpu_state(regs, fp);
470 err |= __put_user((u64)fp, &sf->fpu_save);
471 } else {
472 err |= __put_user(0, &sf->fpu_save);
474 if (wsaved) {
475 __siginfo_rwin_t __user *rwp = tail;
476 tail += sizeof(*rwp);
477 err |= save_rwin_state(wsaved, rwp);
478 err |= __put_user((u64)rwp, &sf->rwin_save);
479 set_thread_wsaved(0);
480 } else {
481 err |= __put_user(0, &sf->rwin_save);
484 switch (_NSIG_WORDS) {
485 case 4: seta[7] = (oldset->sig[3] >> 32);
486 seta[6] = oldset->sig[3];
487 case 3: seta[5] = (oldset->sig[2] >> 32);
488 seta[4] = oldset->sig[2];
489 case 2: seta[3] = (oldset->sig[1] >> 32);
490 seta[2] = oldset->sig[1];
491 case 1: seta[1] = (oldset->sig[0] >> 32);
492 seta[0] = oldset->sig[0];
494 err |= __put_user(seta[0], &sf->info.si_mask);
495 err |= __copy_to_user(sf->extramask, seta + 1,
496 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
498 if (!wsaved) {
499 err |= copy_in_user((u32 __user *)sf,
500 (u32 __user *)(regs->u_regs[UREG_FP]),
501 sizeof(struct reg_window32));
502 } else {
503 struct reg_window *rp;
505 rp = &current_thread_info()->reg_window[wsaved - 1];
506 for (i = 0; i < 8; i++)
507 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
508 for (i = 0; i < 6; i++)
509 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
510 err |= __put_user(rp->ins[6], &sf->ss.fp);
511 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
513 if (err)
514 return err;
516 /* 3. signal handler back-trampoline and parameters */
517 regs->u_regs[UREG_FP] = (unsigned long) sf;
518 regs->u_regs[UREG_I0] = ksig->sig;
519 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
520 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
522 /* 4. signal handler */
523 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
524 regs->tnpc = (regs->tpc + 4);
525 if (test_thread_flag(TIF_32BIT)) {
526 regs->tpc &= 0xffffffff;
527 regs->tnpc &= 0xffffffff;
530 /* 5. return to kernel instructions */
531 if (ksig->ka.ka_restorer) {
532 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
533 } else {
534 unsigned long address = ((unsigned long)&(sf->insns[0]));
536 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
538 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
539 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
540 if (err)
541 return err;
542 flush_signal_insns(address);
544 return 0;
547 static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
548 sigset_t *oldset)
550 struct rt_signal_frame32 __user *sf;
551 int i, err, wsaved;
552 void __user *tail;
553 int sigframe_size;
554 u32 psr;
555 compat_sigset_t seta;
557 /* 1. Make sure everything is clean */
558 synchronize_user_stack();
559 save_and_clear_fpu();
561 wsaved = get_thread_wsaved();
563 sigframe_size = sizeof(*sf);
564 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
565 sigframe_size += sizeof(__siginfo_fpu_t);
566 if (wsaved)
567 sigframe_size += sizeof(__siginfo_rwin_t);
569 sf = (struct rt_signal_frame32 __user *)
570 get_sigframe(ksig, regs, sigframe_size);
572 if (invalid_frame_pointer(sf, sigframe_size)) {
573 do_exit(SIGILL);
574 return -EINVAL;
577 tail = (sf + 1);
579 /* 2. Save the current process state */
580 if (test_thread_flag(TIF_32BIT)) {
581 regs->tpc &= 0xffffffff;
582 regs->tnpc &= 0xffffffff;
584 err = put_user(regs->tpc, &sf->regs.pc);
585 err |= __put_user(regs->tnpc, &sf->regs.npc);
586 err |= __put_user(regs->y, &sf->regs.y);
587 psr = tstate_to_psr(regs->tstate);
588 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
589 psr |= PSR_EF;
590 err |= __put_user(psr, &sf->regs.psr);
591 for (i = 0; i < 16; i++)
592 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
593 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
594 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
595 for (i = 1; i < 16; i++)
596 err |= __put_user(((u32 *)regs->u_regs)[2*i],
597 &sf->v8plus.g_upper[i]);
598 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
599 &sf->v8plus.asi);
601 if (psr & PSR_EF) {
602 __siginfo_fpu_t __user *fp = tail;
603 tail += sizeof(*fp);
604 err |= save_fpu_state(regs, fp);
605 err |= __put_user((u64)fp, &sf->fpu_save);
606 } else {
607 err |= __put_user(0, &sf->fpu_save);
609 if (wsaved) {
610 __siginfo_rwin_t __user *rwp = tail;
611 tail += sizeof(*rwp);
612 err |= save_rwin_state(wsaved, rwp);
613 err |= __put_user((u64)rwp, &sf->rwin_save);
614 set_thread_wsaved(0);
615 } else {
616 err |= __put_user(0, &sf->rwin_save);
619 /* Update the siginfo structure. */
620 err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
622 /* Setup sigaltstack */
623 err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
625 switch (_NSIG_WORDS) {
626 case 4: seta.sig[7] = (oldset->sig[3] >> 32);
627 seta.sig[6] = oldset->sig[3];
628 case 3: seta.sig[5] = (oldset->sig[2] >> 32);
629 seta.sig[4] = oldset->sig[2];
630 case 2: seta.sig[3] = (oldset->sig[1] >> 32);
631 seta.sig[2] = oldset->sig[1];
632 case 1: seta.sig[1] = (oldset->sig[0] >> 32);
633 seta.sig[0] = oldset->sig[0];
635 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
637 if (!wsaved) {
638 err |= copy_in_user((u32 __user *)sf,
639 (u32 __user *)(regs->u_regs[UREG_FP]),
640 sizeof(struct reg_window32));
641 } else {
642 struct reg_window *rp;
644 rp = &current_thread_info()->reg_window[wsaved - 1];
645 for (i = 0; i < 8; i++)
646 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
647 for (i = 0; i < 6; i++)
648 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
649 err |= __put_user(rp->ins[6], &sf->ss.fp);
650 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
652 if (err)
653 return err;
655 /* 3. signal handler back-trampoline and parameters */
656 regs->u_regs[UREG_FP] = (unsigned long) sf;
657 regs->u_regs[UREG_I0] = ksig->sig;
658 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
659 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
661 /* 4. signal handler */
662 regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
663 regs->tnpc = (regs->tpc + 4);
664 if (test_thread_flag(TIF_32BIT)) {
665 regs->tpc &= 0xffffffff;
666 regs->tnpc &= 0xffffffff;
669 /* 5. return to kernel instructions */
670 if (ksig->ka.ka_restorer)
671 regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
672 else {
673 unsigned long address = ((unsigned long)&(sf->insns[0]));
675 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
677 /* mov __NR_rt_sigreturn, %g1 */
678 err |= __put_user(0x82102065, &sf->insns[0]);
680 /* t 0x10 */
681 err |= __put_user(0x91d02010, &sf->insns[1]);
682 if (err)
683 return err;
685 flush_signal_insns(address);
687 return 0;
690 static inline void handle_signal32(struct ksignal *ksig,
691 struct pt_regs *regs)
693 sigset_t *oldset = sigmask_to_save();
694 int err;
696 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
697 err = setup_rt_frame32(ksig, regs, oldset);
698 else
699 err = setup_frame32(ksig, regs, oldset);
701 signal_setup_done(err, ksig, 0);
704 static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
705 struct sigaction *sa)
707 switch (regs->u_regs[UREG_I0]) {
708 case ERESTART_RESTARTBLOCK:
709 case ERESTARTNOHAND:
710 no_system_call_restart:
711 regs->u_regs[UREG_I0] = EINTR;
712 regs->tstate |= TSTATE_ICARRY;
713 break;
714 case ERESTARTSYS:
715 if (!(sa->sa_flags & SA_RESTART))
716 goto no_system_call_restart;
717 /* fallthrough */
718 case ERESTARTNOINTR:
719 regs->u_regs[UREG_I0] = orig_i0;
720 regs->tpc -= 4;
721 regs->tnpc -= 4;
725 /* Note that 'init' is a special process: it doesn't get signals it doesn't
726 * want to handle. Thus you cannot kill init even with a SIGKILL even by
727 * mistake.
729 void do_signal32(struct pt_regs * regs)
731 struct ksignal ksig;
732 unsigned long orig_i0 = 0;
733 int restart_syscall = 0;
734 bool has_handler = get_signal(&ksig);
736 if (pt_regs_is_syscall(regs) &&
737 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
738 restart_syscall = 1;
739 orig_i0 = regs->u_regs[UREG_G6];
742 if (has_handler) {
743 if (restart_syscall)
744 syscall_restart32(orig_i0, regs, &ksig.ka.sa);
745 handle_signal32(&ksig, regs);
746 } else {
747 if (restart_syscall) {
748 switch (regs->u_regs[UREG_I0]) {
749 case ERESTARTNOHAND:
750 case ERESTARTSYS:
751 case ERESTARTNOINTR:
752 /* replay the system call when we are done */
753 regs->u_regs[UREG_I0] = orig_i0;
754 regs->tpc -= 4;
755 regs->tnpc -= 4;
756 pt_regs_clear_syscall(regs);
757 case ERESTART_RESTARTBLOCK:
758 regs->u_regs[UREG_G1] = __NR_restart_syscall;
759 regs->tpc -= 4;
760 regs->tnpc -= 4;
761 pt_regs_clear_syscall(regs);
764 restore_saved_sigmask();
768 struct sigstack32 {
769 u32 the_stack;
770 int cur_status;
773 asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
775 struct sigstack32 __user *ssptr =
776 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
777 struct sigstack32 __user *ossptr =
778 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
779 int ret = -EFAULT;
781 /* First see if old state is wanted. */
782 if (ossptr) {
783 if (put_user(current->sas_ss_sp + current->sas_ss_size,
784 &ossptr->the_stack) ||
785 __put_user(on_sig_stack(sp), &ossptr->cur_status))
786 goto out;
789 /* Now see if we want to update the new state. */
790 if (ssptr) {
791 u32 ss_sp;
793 if (get_user(ss_sp, &ssptr->the_stack))
794 goto out;
796 /* If the current stack was set with sigaltstack, don't
797 * swap stacks while we are on it.
799 ret = -EPERM;
800 if (current->sas_ss_sp && on_sig_stack(sp))
801 goto out;
803 /* Since we don't know the extent of the stack, and we don't
804 * track onstack-ness, but rather calculate it, we must
805 * presume a size. Ho hum this interface is lossy.
807 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
808 current->sas_ss_size = SIGSTKSZ;
811 ret = 0;
812 out:
813 return ret;