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sparc: Stash orig_i0 into %g6 instead of %g2
[linux-block.git] / arch / sparc / kernel / signal32.c
CommitLineData
5526b7e4 1/* arch/sparc64/kernel/signal32.c
1da177e4
LT		 2 *
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 */
9
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>
1da177e4
LT		 19#include <linux/binfmts.h>
20#include <linux/compat.h>
21#include <linux/bitops.h>
95698466 22#include <linux/tracehook.h>
1da177e4
LT		 23
24#include <asm/uaccess.h>
25#include <asm/ptrace.h>
1da177e4
LT		 26#include <asm/pgtable.h>
27#include <asm/psrcompat.h>
28#include <asm/fpumacro.h>
29#include <asm/visasm.h>
14cc6aba 30#include <asm/compat_signal.h>
1da177e4 31
5598473a
DM		 32#include "sigutil.h"
33
1da177e4
LT		 34#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
35
1da177e4
LT		 36/* This magic should be in g_upper[0] for all upper parts
37 * to be valid.
38 */
39#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
40typedef struct {
41 unsigned int g_upper[8];
42 unsigned int o_upper[8];
43 unsigned int asi;
44} siginfo_extra_v8plus_t;
45
5526b7e4 46struct signal_frame32 {
1da177e4
LT		 47 struct sparc_stackf32 ss;
48 __siginfo32_t info;
5598473a 49 /* __siginfo_fpu_t * */ u32 fpu_save;
1da177e4
LT		 50 unsigned int insns[2];
51 unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
52 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
53 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
54 siginfo_extra_v8plus_t v8plus;
5598473a
DM		 55 /* __siginfo_rwin_t * */u32 rwin_save;
56} __attribute__((aligned(8)));
1da177e4
LT		 57
58typedef struct compat_siginfo{
59 int si_signo;
60 int si_errno;
61 int si_code;
62
63 union {
64 int _pad[SI_PAD_SIZE32];
65
66 /* kill() */
67 struct {
68 compat_pid_t _pid; /* sender's pid */
69 unsigned int _uid; /* sender's uid */
70 } _kill;
71
72 /* POSIX.1b timers */
73 struct {
0d77e5a2 74 compat_timer_t _tid; /* timer id */
1da177e4
LT		 75 int _overrun; /* overrun count */
76 compat_sigval_t _sigval; /* same as below */
77 int _sys_private; /* not to be passed to user */
78 } _timer;
79
80 /* POSIX.1b signals */
81 struct {
82 compat_pid_t _pid; /* sender's pid */
83 unsigned int _uid; /* sender's uid */
84 compat_sigval_t _sigval;
85 } _rt;
86
87 /* SIGCHLD */
88 struct {
89 compat_pid_t _pid; /* which child */
90 unsigned int _uid; /* sender's uid */
91 int _status; /* exit code */
92 compat_clock_t _utime;
93 compat_clock_t _stime;
94 } _sigchld;
95
96 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */
97 struct {
98 u32 _addr; /* faulting insn/memory ref. */
99 int _trapno;
100 } _sigfault;
101
102 /* SIGPOLL */
103 struct {
104 int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
105 int _fd;
106 } _sigpoll;
107 } _sifields;
108}compat_siginfo_t;
109
110struct rt_signal_frame32 {
111 struct sparc_stackf32 ss;
112 compat_siginfo_t info;
113 struct pt_regs32 regs;
114 compat_sigset_t mask;
5598473a 115 /* __siginfo_fpu_t * */ u32 fpu_save;
1da177e4
LT		 116 unsigned int insns[2];
117 stack_t32 stack;
118 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
119 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
120 siginfo_extra_v8plus_t v8plus;
5598473a
DM		 121 /* __siginfo_rwin_t * */u32 rwin_save;
122} __attribute__((aligned(8)));
1da177e4
LT		 123
124int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
125{
126 int err;
127
128 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
129 return -EFAULT;
130
131 /* If you change siginfo_t structure, please be sure
132 this code is fixed accordingly.
133 It should never copy any pad contained in the structure
134 to avoid security leaks, but must copy the generic
135 3 ints plus the relevant union member.
136 This routine must convert siginfo from 64bit to 32bit as well
137 at the same time. */
138 err = __put_user(from->si_signo, &to->si_signo);
139 err |= __put_user(from->si_errno, &to->si_errno);
140 err |= __put_user((short)from->si_code, &to->si_code);
141 if (from->si_code < 0)
142 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
143 else {
144 switch (from->si_code >> 16) {
145 case __SI_TIMER >> 16:
146 err |= __put_user(from->si_tid, &to->si_tid);
147 err |= __put_user(from->si_overrun, &to->si_overrun);
148 err |= __put_user(from->si_int, &to->si_int);
149 break;
150 case __SI_CHLD >> 16:
151 err |= __put_user(from->si_utime, &to->si_utime);
152 err |= __put_user(from->si_stime, &to->si_stime);
153 err |= __put_user(from->si_status, &to->si_status);
154 default:
155 err |= __put_user(from->si_pid, &to->si_pid);
156 err |= __put_user(from->si_uid, &to->si_uid);
157 break;
158 case __SI_FAULT >> 16:
1da177e4
LT		 159 err |= __put_user(from->si_trapno, &to->si_trapno);
160 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
161 break;
9c7d3b3a
JS		 162 case __SI_POLL >> 16:
163 err |= __put_user(from->si_band, &to->si_band);
164 err |= __put_user(from->si_fd, &to->si_fd);
165 break;
1da177e4
LT		 166 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
167 case __SI_MESGQ >> 16:
168 err |= __put_user(from->si_pid, &to->si_pid);
169 err |= __put_user(from->si_uid, &to->si_uid);
170 err |= __put_user(from->si_int, &to->si_int);
171 break;
172 }
173 }
174 return err;
175}
176
177/* CAUTION: This is just a very minimalist implementation for the
178 * sake of compat_sys_rt_sigqueueinfo()
179 */
180int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
181{
182 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
183 return -EFAULT;
184
185 if (copy_from_user(to, from, 3*sizeof(int)) ||
186 copy_from_user(to->_sifields._pad, from->_sifields._pad,
187 SI_PAD_SIZE))
188 return -EFAULT;
189
190 return 0;
191}
192
5526b7e4 193void do_sigreturn32(struct pt_regs *regs)
1da177e4 194{
5526b7e4 195 struct signal_frame32 __user *sf;
5598473a
DM		 196 compat_uptr_t fpu_save;
197 compat_uptr_t rwin_save;
1da177e4 198 unsigned int psr;
5598473a 199 unsigned pc, npc;
1da177e4
LT		 200 sigset_t set;
201 unsigned seta[_COMPAT_NSIG_WORDS];
202 int err, i;
203
5526b7e4
DM		 204 /* Always make any pending restarted system calls return -EINTR */
205 current_thread_info()->restart_block.fn = do_no_restart_syscall;
206
207 synchronize_user_stack();
208
1da177e4 209 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
5526b7e4 210 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
1da177e4
LT		 211
212 /* 1. Make sure we are not getting garbage from the user */
213 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
214 (((unsigned long) sf) & 3))
215 goto segv;
216
217 get_user(pc, &sf->info.si_regs.pc);
218 __get_user(npc, &sf->info.si_regs.npc);
219
220 if ((pc | npc) & 3)
221 goto segv;
222
223 if (test_thread_flag(TIF_32BIT)) {
224 pc &= 0xffffffff;
225 npc &= 0xffffffff;
226 }
227 regs->tpc = pc;
228 regs->tnpc = npc;
229
230 /* 2. Restore the state */
231 err = __get_user(regs->y, &sf->info.si_regs.y);
232 err |= __get_user(psr, &sf->info.si_regs.psr);
233
234 for (i = UREG_G1; i <= UREG_I7; i++)
235 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
236 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
237 err |= __get_user(i, &sf->v8plus.g_upper[0]);
238 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
239 unsigned long asi;
240
241 for (i = UREG_G1; i <= UREG_I7; i++)
242 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
243 err |= __get_user(asi, &sf->v8plus.asi);
244 regs->tstate &= ~TSTATE_ASI;
245 regs->tstate |= ((asi & 0xffUL) << 24UL);
246 }
247 }
248
249 /* User can only change condition codes in %tstate. */
250 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
251 regs->tstate |= psr_to_tstate_icc(psr);
252
2678fefe 253 /* Prevent syscall restart. */
28e61036 254 pt_regs_clear_syscall(regs);
2678fefe 255
1da177e4 256 err |= __get_user(fpu_save, &sf->fpu_save);
5598473a
DM		 257 if (!err && fpu_save)
258 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
259 err |= __get_user(rwin_save, &sf->rwin_save);
260 if (!err && rwin_save) {
261 if (restore_rwin_state(compat_ptr(rwin_save)))
262 goto segv;
263 }
1da177e4
LT		 264 err |= __get_user(seta[0], &sf->info.si_mask);
265 err |= copy_from_user(seta+1, &sf->extramask,
266 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
267 if (err)
268 goto segv;
269 switch (_NSIG_WORDS) {
270 case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
271 case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
272 case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
273 case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
274 }
275 sigdelsetmask(&set, ~_BLOCKABLE);
faddf598 276 set_current_blocked(&set);
1da177e4
LT		 277 return;
278
279segv:
280 force_sig(SIGSEGV, current);
281}
282
1da177e4
LT		 283asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
284{
285 struct rt_signal_frame32 __user *sf;
5598473a
DM		 286 unsigned int psr, pc, npc, u_ss_sp;
287 compat_uptr_t fpu_save;
288 compat_uptr_t rwin_save;
1da177e4
LT		 289 mm_segment_t old_fs;
290 sigset_t set;
291 compat_sigset_t seta;
292 stack_t st;
293 int err, i;
294
295 /* Always make any pending restarted system calls return -EINTR */
296 current_thread_info()->restart_block.fn = do_no_restart_syscall;
297
298 synchronize_user_stack();
299 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
300 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
301
302 /* 1. Make sure we are not getting garbage from the user */
303 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
304 (((unsigned long) sf) & 3))
305 goto segv;
306
307 get_user(pc, &sf->regs.pc);
308 __get_user(npc, &sf->regs.npc);
309
310 if ((pc | npc) & 3)
311 goto segv;
312
313 if (test_thread_flag(TIF_32BIT)) {
314 pc &= 0xffffffff;
315 npc &= 0xffffffff;
316 }
317 regs->tpc = pc;
318 regs->tnpc = npc;
319
320 /* 2. Restore the state */
321 err = __get_user(regs->y, &sf->regs.y);
322 err |= __get_user(psr, &sf->regs.psr);
323
324 for (i = UREG_G1; i <= UREG_I7; i++)
325 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
326 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
327 err |= __get_user(i, &sf->v8plus.g_upper[0]);
328 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
329 unsigned long asi;
330
331 for (i = UREG_G1; i <= UREG_I7; i++)
332 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
333 err |= __get_user(asi, &sf->v8plus.asi);
334 regs->tstate &= ~TSTATE_ASI;
335 regs->tstate |= ((asi & 0xffUL) << 24UL);
336 }
337 }
338
339 /* User can only change condition codes in %tstate. */
340 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
341 regs->tstate |= psr_to_tstate_icc(psr);
342
2678fefe 343 /* Prevent syscall restart. */
28e61036 344 pt_regs_clear_syscall(regs);
2678fefe 345
1da177e4 346 err |= __get_user(fpu_save, &sf->fpu_save);
5598473a
DM		 347 if (!err && fpu_save)
348 err |= restore_fpu_state(regs, compat_ptr(fpu_save));
1da177e4
LT		 349 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
350 err |= __get_user(u_ss_sp, &sf->stack.ss_sp);
351 st.ss_sp = compat_ptr(u_ss_sp);
352 err |= __get_user(st.ss_flags, &sf->stack.ss_flags);
353 err |= __get_user(st.ss_size, &sf->stack.ss_size);
354 if (err)
355 goto segv;
356
357 /* It is more difficult to avoid calling this function than to
358 call it and ignore errors. */
359 old_fs = get_fs();
360 set_fs(KERNEL_DS);
361 do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf);
362 set_fs(old_fs);
363
5598473a
DM		 364 err |= __get_user(rwin_save, &sf->rwin_save);
365 if (!err && rwin_save) {
366 if (restore_rwin_state(compat_ptr(rwin_save)))
367 goto segv;
368 }
369
1da177e4
LT		 370 switch (_NSIG_WORDS) {
371 case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32);
372 case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32);
373 case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32);
374 case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
375 }
376 sigdelsetmask(&set, ~_BLOCKABLE);
faddf598 377 set_current_blocked(&set);
1da177e4
LT		 378 return;
379segv:
380 force_sig(SIGSEGV, current);
381}
382
383/* Checks if the fp is valid */
384static int invalid_frame_pointer(void __user *fp, int fplen)
385{
386 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
387 return 1;
388 return 0;
389}
390
391static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
392{
393 unsigned long sp;
394
395 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
396 sp = regs->u_regs[UREG_FP];
397
dc5dc7e6
DM		 398 /*
399 * If we are on the alternate signal stack and would overflow it, don't.
400 * Return an always-bogus address instead so we will die with SIGSEGV.
401 */
402 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
403 return (void __user *) -1L;
404
1da177e4
LT		 405 /* This is the X/Open sanctioned signal stack switching. */
406 if (sa->sa_flags & SA_ONSTACK) {
dc5dc7e6 407 if (sas_ss_flags(sp) == 0)
1da177e4
LT		 408 sp = current->sas_ss_sp + current->sas_ss_size;
409 }
dc5dc7e6 410
f036d9f3
DM		 411 sp -= framesize;
412
dc5dc7e6
DM		 413 /* Always align the stack frame. This handles two cases. First,
414 * sigaltstack need not be mindful of platform specific stack
415 * alignment. Second, if we took this signal because the stack
416 * is not aligned properly, we'd like to take the signal cleanly
417 * and report that.
418 */
f036d9f3 419 sp &= ~15UL;
dc5dc7e6 420
f036d9f3 421 return (void __user *) sp;
1da177e4
LT		 422}
423
05c5e769
DM		 424/* The I-cache flush instruction only works in the primary ASI, which
425 * right now is the nucleus, aka. kernel space.
426 *
427 * Therefore we have to kick the instructions out using the kernel
428 * side linear mapping of the physical address backing the user
429 * instructions.
430 */
431static void flush_signal_insns(unsigned long address)
432{
433 unsigned long pstate, paddr;
434 pte_t *ptep, pte;
435 pgd_t *pgdp;
436 pud_t *pudp;
437 pmd_t *pmdp;
438
439 /* Commit all stores of the instructions we are about to flush. */
440 wmb();
441
442 /* Disable cross-call reception. In this way even a very wide
443 * munmap() on another cpu can't tear down the page table
444 * hierarchy from underneath us, since that can't complete
445 * until the IPI tlb flush returns.
446 */
447
448 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
449 __asm__ __volatile__("wrpr %0, %1, %%pstate"
450 : : "r" (pstate), "i" (PSTATE_IE));
451
452 pgdp = pgd_offset(current->mm, address);
453 if (pgd_none(*pgdp))
454 goto out_irqs_on;
455 pudp = pud_offset(pgdp, address);
456 if (pud_none(*pudp))
457 goto out_irqs_on;
458 pmdp = pmd_offset(pudp, address);
459 if (pmd_none(*pmdp))
460 goto out_irqs_on;
461
462 ptep = pte_offset_map(pmdp, address);
463 pte = *ptep;
464 if (!pte_present(pte))
465 goto out_unmap;
466
467 paddr = (unsigned long) page_address(pte_page(pte));
468
469 __asm__ __volatile__("flush %0 + %1"
470 : /* no outputs */
471 : "r" (paddr),
472 "r" (address & (PAGE_SIZE - 1))
473 : "memory");
474
475out_unmap:
476 pte_unmap(ptep);
477out_irqs_on:
478 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
479
480}
481
392c2180
DM		 482static int setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
483 int signo, sigset_t *oldset)
1da177e4 484{
5526b7e4 485 struct signal_frame32 __user *sf;
5598473a
DM		 486 int i, err, wsaved;
487 void __user *tail;
1da177e4
LT		 488 int sigframe_size;
489 u32 psr;
1da177e4
LT		 490 unsigned int seta[_COMPAT_NSIG_WORDS];
491
492 /* 1. Make sure everything is clean */
493 synchronize_user_stack();
494 save_and_clear_fpu();
495
5598473a
DM		 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);
1da177e4 503
5526b7e4 504 sf = (struct signal_frame32 __user *)
1da177e4
LT		 505 get_sigframe(&ka->sa, regs, sigframe_size);
506
507 if (invalid_frame_pointer(sf, sigframe_size))
508 goto sigill;
509
5598473a 510 tail = (sf + 1);
1da177e4
LT		 511
512 /* 2. Save the current process state */
513 if (test_thread_flag(TIF_32BIT)) {
514 regs->tpc &= 0xffffffff;
515 regs->tnpc &= 0xffffffff;
516 }
517 err = put_user(regs->tpc, &sf->info.si_regs.pc);
518 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
519 err |= __put_user(regs->y, &sf->info.si_regs.y);
520 psr = tstate_to_psr(regs->tstate);
521 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
522 psr |= PSR_EF;
523 err |= __put_user(psr, &sf->info.si_regs.psr);
524 for (i = 0; i < 16; i++)
525 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
526 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
527 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
528 for (i = 1; i < 16; i++)
529 err |= __put_user(((u32 *)regs->u_regs)[2*i],
530 &sf->v8plus.g_upper[i]);
531 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
532 &sf->v8plus.asi);
533
534 if (psr & PSR_EF) {
5598473a
DM		 535 __siginfo_fpu_t __user *fp = tail;
536 tail += sizeof(*fp);
537 err |= save_fpu_state(regs, fp);
538 err |= __put_user((u64)fp, &sf->fpu_save);
1da177e4
LT		 539 } else {
540 err |= __put_user(0, &sf->fpu_save);
541 }
5598473a
DM		 542 if (wsaved) {
543 __siginfo_rwin_t __user *rwp = tail;
544 tail += sizeof(*rwp);
545 err |= save_rwin_state(wsaved, rwp);
546 err |= __put_user((u64)rwp, &sf->rwin_save);
547 set_thread_wsaved(0);
548 } else {
549 err |= __put_user(0, &sf->rwin_save);
550 }
1da177e4
LT		 551
552 switch (_NSIG_WORDS) {
553 case 4: seta[7] = (oldset->sig[3] >> 32);
554 seta[6] = oldset->sig[3];
555 case 3: seta[5] = (oldset->sig[2] >> 32);
556 seta[4] = oldset->sig[2];
557 case 2: seta[3] = (oldset->sig[1] >> 32);
558 seta[2] = oldset->sig[1];
559 case 1: seta[1] = (oldset->sig[0] >> 32);
560 seta[0] = oldset->sig[0];
561 }
562 err |= __put_user(seta[0], &sf->info.si_mask);
563 err |= __copy_to_user(sf->extramask, seta + 1,
564 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
565
5598473a
DM		 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 }
1da177e4
LT		 581 if (err)
582 goto sigsegv;
583
584 /* 3. signal handler back-trampoline and parameters */
585 regs->u_regs[UREG_FP] = (unsigned long) sf;
586 regs->u_regs[UREG_I0] = signo;
587 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
588 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
589
590 /* 4. signal handler */
591 regs->tpc = (unsigned long) 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 (ka->ka_restorer) {
600 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
601 } else {
1da177e4 602 unsigned long address = ((unsigned long)&(sf->insns[0]));
1da177e4
LT		 603
604 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
605
606 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
607 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
608 if (err)
609 goto sigsegv;
05c5e769 610 flush_signal_insns(address);
1da177e4 611 }
c2785259 612 return 0;
1da177e4
LT		 613
614sigill:
615 do_exit(SIGILL);
392c2180
DM		 616 return -EINVAL;
617
1da177e4
LT		 618sigsegv:
619 force_sigsegv(signo, current);
392c2180 620 return -EFAULT;
1da177e4
LT		 621}
622
392c2180
DM		 623static int setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
624 unsigned long signr, sigset_t *oldset,
625 siginfo_t *info)
1da177e4
LT		 626{
627 struct rt_signal_frame32 __user *sf;
5598473a
DM		 628 int i, err, wsaved;
629 void __user *tail;
1da177e4
LT		 630 int sigframe_size;
631 u32 psr;
1da177e4
LT		 632 compat_sigset_t seta;
633
634 /* 1. Make sure everything is clean */
635 synchronize_user_stack();
636 save_and_clear_fpu();
637
5598473a
DM		 638 wsaved = get_thread_wsaved();
639
640 sigframe_size = sizeof(*sf);
641 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
642 sigframe_size += sizeof(__siginfo_fpu_t);
643 if (wsaved)
644 sigframe_size += sizeof(__siginfo_rwin_t);
1da177e4
LT		 645
646 sf = (struct rt_signal_frame32 __user *)
647 get_sigframe(&ka->sa, regs, sigframe_size);
648
649 if (invalid_frame_pointer(sf, sigframe_size))
650 goto sigill;
651
5598473a 652 tail = (sf + 1);
1da177e4
LT		 653
654 /* 2. Save the current process state */
655 if (test_thread_flag(TIF_32BIT)) {
656 regs->tpc &= 0xffffffff;
657 regs->tnpc &= 0xffffffff;
658 }
659 err = put_user(regs->tpc, &sf->regs.pc);
660 err |= __put_user(regs->tnpc, &sf->regs.npc);
661 err |= __put_user(regs->y, &sf->regs.y);
662 psr = tstate_to_psr(regs->tstate);
663 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
664 psr |= PSR_EF;
665 err |= __put_user(psr, &sf->regs.psr);
666 for (i = 0; i < 16; i++)
667 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
668 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
669 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
670 for (i = 1; i < 16; i++)
671 err |= __put_user(((u32 *)regs->u_regs)[2*i],
672 &sf->v8plus.g_upper[i]);
673 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
674 &sf->v8plus.asi);
675
676 if (psr & PSR_EF) {
5598473a
DM		 677 __siginfo_fpu_t __user *fp = tail;
678 tail += sizeof(*fp);
679 err |= save_fpu_state(regs, fp);
680 err |= __put_user((u64)fp, &sf->fpu_save);
1da177e4
LT		 681 } else {
682 err |= __put_user(0, &sf->fpu_save);
683 }
5598473a
DM		 684 if (wsaved) {
685 __siginfo_rwin_t __user *rwp = tail;
686 tail += sizeof(*rwp);
687 err |= save_rwin_state(wsaved, rwp);
688 err |= __put_user((u64)rwp, &sf->rwin_save);
689 set_thread_wsaved(0);
690 } else {
691 err |= __put_user(0, &sf->rwin_save);
692 }
1da177e4
LT		 693
694 /* Update the siginfo structure. */
695 err |= copy_siginfo_to_user32(&sf->info, info);
696
697 /* Setup sigaltstack */
698 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
699 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
700 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
701
702 switch (_NSIG_WORDS) {
703 case 4: seta.sig[7] = (oldset->sig[3] >> 32);
704 seta.sig[6] = oldset->sig[3];
705 case 3: seta.sig[5] = (oldset->sig[2] >> 32);
706 seta.sig[4] = oldset->sig[2];
707 case 2: seta.sig[3] = (oldset->sig[1] >> 32);
708 seta.sig[2] = oldset->sig[1];
709 case 1: seta.sig[1] = (oldset->sig[0] >> 32);
710 seta.sig[0] = oldset->sig[0];
711 }
712 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
713
5598473a
DM		 714 if (!wsaved) {
715 err |= copy_in_user((u32 __user *)sf,
716 (u32 __user *)(regs->u_regs[UREG_FP]),
717 sizeof(struct reg_window32));
718 } else {
719 struct reg_window *rp;
720
721 rp = &current_thread_info()->reg_window[wsaved - 1];
722 for (i = 0; i < 8; i++)
723 err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
724 for (i = 0; i < 6; i++)
725 err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
726 err |= __put_user(rp->ins[6], &sf->ss.fp);
727 err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
728 }
1da177e4
LT		 729 if (err)
730 goto sigsegv;
731
732 /* 3. signal handler back-trampoline and parameters */
733 regs->u_regs[UREG_FP] = (unsigned long) sf;
734 regs->u_regs[UREG_I0] = signr;
735 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
736 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
737
738 /* 4. signal handler */
739 regs->tpc = (unsigned long) ka->sa.sa_handler;
740 regs->tnpc = (regs->tpc + 4);
741 if (test_thread_flag(TIF_32BIT)) {
742 regs->tpc &= 0xffffffff;
743 regs->tnpc &= 0xffffffff;
744 }
745
746 /* 5. return to kernel instructions */
747 if (ka->ka_restorer)
748 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
749 else {
1da177e4 750 unsigned long address = ((unsigned long)&(sf->insns[0]));
1da177e4
LT		 751
752 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
753
754 /* mov __NR_rt_sigreturn, %g1 */
755 err |= __put_user(0x82102065, &sf->insns[0]);
756
757 /* t 0x10 */
758 err |= __put_user(0x91d02010, &sf->insns[1]);
759 if (err)
760 goto sigsegv;
761
05c5e769 762 flush_signal_insns(address);
1da177e4 763 }
392c2180 764 return 0;
1da177e4
LT		 765
766sigill:
767 do_exit(SIGILL);
392c2180
DM		 768 return -EINVAL;
769
1da177e4
LT		 770sigsegv:
771 force_sigsegv(signr, current);
392c2180 772 return -EFAULT;
1da177e4
LT		 773}
774
392c2180
DM		 775static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka,
776 siginfo_t *info,
777 sigset_t *oldset, struct pt_regs *regs)
1da177e4 778{
faddf598 779 sigset_t blocked;
392c2180
DM		 780 int err;
781
ec98c6b9 782 if (ka->sa.sa_flags & SA_SIGINFO)
392c2180 783 err = setup_rt_frame32(ka, regs, signr, oldset, info);
ec98c6b9 784 else
392c2180
DM		 785 err = setup_frame32(ka, regs, signr, oldset);
786
787 if (err)
788 return err;
5526b7e4 789
faddf598 790 sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
69be8f18 791 if (!(ka->sa.sa_flags & SA_NOMASK))
faddf598
MF		 792 sigaddset(&blocked, signr);
793 set_current_blocked(&blocked);
392c2180
DM		 794
795 tracehook_signal_handler(signr, info, ka, regs, 0);
796
797 return 0;
1da177e4
LT		 798}
799
800static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
801 struct sigaction *sa)
802{
803 switch (regs->u_regs[UREG_I0]) {
804 case ERESTART_RESTARTBLOCK:
805 case ERESTARTNOHAND:
806 no_system_call_restart:
807 regs->u_regs[UREG_I0] = EINTR;
808 regs->tstate |= TSTATE_ICARRY;
809 break;
810 case ERESTARTSYS:
811 if (!(sa->sa_flags & SA_RESTART))
812 goto no_system_call_restart;
813 /* fallthrough */
814 case ERESTARTNOINTR:
815 regs->u_regs[UREG_I0] = orig_i0;
816 regs->tpc -= 4;
817 regs->tnpc -= 4;
818 }
819}
820
821/* Note that 'init' is a special process: it doesn't get signals it doesn't
822 * want to handle. Thus you cannot kill init even with a SIGKILL even by
823 * mistake.
824 */
1d299bc7 825void do_signal32(sigset_t *oldset, struct pt_regs * regs)
1da177e4 826{
1da177e4 827 struct k_sigaction ka;
1d299bc7
DM		 828 unsigned long orig_i0;
829 int restart_syscall;
238468b2 830 siginfo_t info;
1da177e4 831 int signr;
1da177e4 832
28e61036
DM		 833 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
834
1d299bc7
DM		 835 restart_syscall = 0;
836 orig_i0 = 0;
837 if (pt_regs_is_syscall(regs) &&
838 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
839 restart_syscall = 1;
e88d2468 840 orig_i0 = regs->u_regs[UREG_G6];
1d299bc7 841 }
28e61036 842
1da177e4 843 if (signr > 0) {
28e61036
DM		 844 if (restart_syscall)
845 syscall_restart32(orig_i0, regs, &ka.sa);
392c2180
DM		 846 if (handle_signal32(signr, &ka, &info, oldset, regs) == 0) {
847 /* A signal was successfully delivered; the saved
848 * sigmask will have been stored in the signal frame,
849 * and will be restored by sigreturn, so we can simply
850 * clear the TS_RESTORE_SIGMASK flag.
851 */
852 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
853 }
2d7d5f05 854 return;
1da177e4 855 }
28e61036 856 if (restart_syscall &&
1da177e4
LT		 857 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
858 regs->u_regs[UREG_I0] == ERESTARTSYS ||
859 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
860 /* replay the system call when we are done */
28e61036 861 regs->u_regs[UREG_I0] = orig_i0;
1da177e4
LT		 862 regs->tpc -= 4;
863 regs->tnpc -= 4;
c2785259 864 pt_regs_clear_syscall(regs);
1da177e4 865 }
28e61036 866 if (restart_syscall &&
1da177e4
LT		 867 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
868 regs->u_regs[UREG_G1] = __NR_restart_syscall;
869 regs->tpc -= 4;
870 regs->tnpc -= 4;
c2785259 871 pt_regs_clear_syscall(regs);
1da177e4 872 }
2d7d5f05 873
9a28dbf8 874 /* If there's no signal to deliver, we just put the saved sigmask
2d7d5f05
DM		 875 * back
876 */
9a28dbf8
DM		 877 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
878 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
27f20dca 879 set_current_blocked(&current->saved_sigmask);
2d7d5f05 880 }
1da177e4
LT		 881}
882
883struct sigstack32 {
884 u32 the_stack;
885 int cur_status;
886};
887
888asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
889{
890 struct sigstack32 __user *ssptr =
891 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
892 struct sigstack32 __user *ossptr =
893 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
894 int ret = -EFAULT;
895
896 /* First see if old state is wanted. */
897 if (ossptr) {
898 if (put_user(current->sas_ss_sp + current->sas_ss_size,
899 &ossptr->the_stack) ||
900 __put_user(on_sig_stack(sp), &ossptr->cur_status))
901 goto out;
902 }
903
904 /* Now see if we want to update the new state. */
905 if (ssptr) {
906 u32 ss_sp;
907
908 if (get_user(ss_sp, &ssptr->the_stack))
909 goto out;
910
911 /* If the current stack was set with sigaltstack, don't
912 * swap stacks while we are on it.
913 */
914 ret = -EPERM;
915 if (current->sas_ss_sp && on_sig_stack(sp))
916 goto out;
917
918 /* Since we don't know the extent of the stack, and we don't
919 * track onstack-ness, but rather calculate it, we must
920 * presume a size. Ho hum this interface is lossy.
921 */
922 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
923 current->sas_ss_size = SIGSTKSZ;
924 }
925
926 ret = 0;
927out:
928 return ret;
929}
930
931asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp)
932{
933 stack_t uss, uoss;
934 u32 u_ss_sp = 0;
935 int ret;
936 mm_segment_t old_fs;
937 stack_t32 __user *uss32 = compat_ptr(ussa);
938 stack_t32 __user *uoss32 = compat_ptr(uossa);
939
940 if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) ||
941 __get_user(uss.ss_flags, &uss32->ss_flags) ||
942 __get_user(uss.ss_size, &uss32->ss_size)))
943 return -EFAULT;
944 uss.ss_sp = compat_ptr(u_ss_sp);
945 old_fs = get_fs();
946 set_fs(KERNEL_DS);
947 ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL,
948 uossa ? (stack_t __user *) &uoss : NULL, sp);
949 set_fs(old_fs);
950 if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) ||
951 __put_user(uoss.ss_flags, &uoss32->ss_flags) ||
952 __put_user(uoss.ss_size, &uoss32->ss_size)))
953 return -EFAULT;
954 return ret;
955}
Linux 6.x block layer and io_uring tree(s)