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 | |
24 | #include <linux/uaccess.h> |
25 | #include <asm/ptrace.h> |
26 | #include <asm/psrcompat.h> |
27 | #include <asm/fpumacro.h> |
28 | #include <asm/visasm.h> |
29 | #include <asm/compat_signal.h> |
30 | #include <asm/switch_to.h> |
31 | |
32 | #include "sigutil.h" |
33 | #include "kernel.h" |
34 | |
35 | /* This magic should be in g_upper[0] for all upper parts |
36 | * to be valid. |
37 | */ |
38 | #define 0x130e269 |
39 | typedef struct { |
40 | unsigned int [8]; |
41 | unsigned int [8]; |
42 | unsigned int ; |
43 | } ; |
44 | |
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 [_COMPAT_NSIG_WORDS - 1]; |
51 | unsigned int ; /* 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))); |
56 | |
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 ; /* 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))); |
70 | |
71 | /* Checks if the fp is valid. We always build signal frames which are |
72 | * 16-byte aligned, therefore we can always enforce that the restore |
73 | * frame has that property as well. |
74 | */ |
75 | static bool invalid_frame_pointer(void __user *fp, int fplen) |
76 | { |
77 | if ((((unsigned long) fp) & 15) || |
78 | ((unsigned long)fp) > 0x100000000ULL - fplen) |
79 | return true; |
80 | return false; |
81 | } |
82 | |
83 | void do_sigreturn32(struct pt_regs *regs) |
84 | { |
85 | struct signal_frame32 __user *sf; |
86 | compat_uptr_t fpu_save; |
87 | compat_uptr_t rwin_save; |
88 | unsigned int psr, ufp; |
89 | unsigned int pc, npc; |
90 | sigset_t set; |
91 | compat_sigset_t seta; |
92 | int err, i; |
93 | |
94 | /* Always make any pending restarted system calls return -EINTR */ |
95 | current->restart_block.fn = do_no_restart_syscall; |
96 | |
97 | synchronize_user_stack(); |
98 | |
99 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
100 | sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; |
101 | |
102 | /* 1. Make sure we are not getting garbage from the user */ |
103 | if (invalid_frame_pointer(fp: sf, fplen: sizeof(*sf))) |
104 | goto segv; |
105 | |
106 | if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP])) |
107 | goto segv; |
108 | |
109 | if (ufp & 0x7) |
110 | goto segv; |
111 | |
112 | if (__get_user(pc, &sf->info.si_regs.pc) || |
113 | __get_user(npc, &sf->info.si_regs.npc)) |
114 | goto segv; |
115 | |
116 | if ((pc | npc) & 3) |
117 | goto segv; |
118 | |
119 | if (test_thread_flag(TIF_32BIT)) { |
120 | pc &= 0xffffffff; |
121 | npc &= 0xffffffff; |
122 | } |
123 | regs->tpc = pc; |
124 | regs->tnpc = npc; |
125 | |
126 | /* 2. Restore the state */ |
127 | err = __get_user(regs->y, &sf->info.si_regs.y); |
128 | err |= __get_user(psr, &sf->info.si_regs.psr); |
129 | |
130 | for (i = UREG_G1; i <= UREG_I7; i++) |
131 | err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); |
132 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { |
133 | err |= __get_user(i, &sf->v8plus.g_upper[0]); |
134 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { |
135 | unsigned long asi; |
136 | |
137 | for (i = UREG_G1; i <= UREG_I7; i++) |
138 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); |
139 | err |= __get_user(asi, &sf->v8plus.asi); |
140 | regs->tstate &= ~TSTATE_ASI; |
141 | regs->tstate |= ((asi & 0xffUL) << 24UL); |
142 | } |
143 | } |
144 | |
145 | /* User can only change condition codes in %tstate. */ |
146 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); |
147 | regs->tstate |= psr_to_tstate_icc(psr); |
148 | |
149 | /* Prevent syscall restart. */ |
150 | pt_regs_clear_syscall(regs); |
151 | |
152 | err |= __get_user(fpu_save, &sf->fpu_save); |
153 | if (!err && fpu_save) |
154 | err |= restore_fpu_state(regs, compat_ptr(uptr: fpu_save)); |
155 | err |= __get_user(rwin_save, &sf->rwin_save); |
156 | if (!err && rwin_save) { |
157 | if (restore_rwin_state(compat_ptr(uptr: rwin_save))) |
158 | goto segv; |
159 | } |
160 | err |= __get_user(seta.sig[0], &sf->info.si_mask); |
161 | err |= copy_from_user(to: &seta.sig[1], from: &sf->extramask, |
162 | n: (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
163 | if (err) |
164 | goto segv; |
165 | |
166 | set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); |
167 | set_current_blocked(&set); |
168 | return; |
169 | |
170 | segv: |
171 | force_sig(SIGSEGV); |
172 | } |
173 | |
174 | asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
175 | { |
176 | struct rt_signal_frame32 __user *sf; |
177 | unsigned int psr, pc, npc, ufp; |
178 | compat_uptr_t fpu_save; |
179 | compat_uptr_t rwin_save; |
180 | sigset_t set; |
181 | int err, i; |
182 | |
183 | /* Always make any pending restarted system calls return -EINTR */ |
184 | current->restart_block.fn = do_no_restart_syscall; |
185 | |
186 | synchronize_user_stack(); |
187 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
188 | sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; |
189 | |
190 | /* 1. Make sure we are not getting garbage from the user */ |
191 | if (invalid_frame_pointer(fp: sf, fplen: sizeof(*sf))) |
192 | goto segv; |
193 | |
194 | if (get_user(ufp, &sf->regs.u_regs[UREG_FP])) |
195 | goto segv; |
196 | |
197 | if (ufp & 0x7) |
198 | goto segv; |
199 | |
200 | if (__get_user(pc, &sf->regs.pc) || |
201 | __get_user(npc, &sf->regs.npc)) |
202 | goto segv; |
203 | |
204 | if ((pc | npc) & 3) |
205 | goto segv; |
206 | |
207 | if (test_thread_flag(TIF_32BIT)) { |
208 | pc &= 0xffffffff; |
209 | npc &= 0xffffffff; |
210 | } |
211 | regs->tpc = pc; |
212 | regs->tnpc = npc; |
213 | |
214 | /* 2. Restore the state */ |
215 | err = __get_user(regs->y, &sf->regs.y); |
216 | err |= __get_user(psr, &sf->regs.psr); |
217 | |
218 | for (i = UREG_G1; i <= UREG_I7; i++) |
219 | err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); |
220 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { |
221 | err |= __get_user(i, &sf->v8plus.g_upper[0]); |
222 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { |
223 | unsigned long asi; |
224 | |
225 | for (i = UREG_G1; i <= UREG_I7; i++) |
226 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); |
227 | err |= __get_user(asi, &sf->v8plus.asi); |
228 | regs->tstate &= ~TSTATE_ASI; |
229 | regs->tstate |= ((asi & 0xffUL) << 24UL); |
230 | } |
231 | } |
232 | |
233 | /* User can only change condition codes in %tstate. */ |
234 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); |
235 | regs->tstate |= psr_to_tstate_icc(psr); |
236 | |
237 | /* Prevent syscall restart. */ |
238 | pt_regs_clear_syscall(regs); |
239 | |
240 | err |= __get_user(fpu_save, &sf->fpu_save); |
241 | if (!err && fpu_save) |
242 | err |= restore_fpu_state(regs, compat_ptr(uptr: fpu_save)); |
243 | err |= get_compat_sigset(set: &set, compat: &sf->mask); |
244 | err |= compat_restore_altstack(uss: &sf->stack); |
245 | if (err) |
246 | goto segv; |
247 | |
248 | err |= __get_user(rwin_save, &sf->rwin_save); |
249 | if (!err && rwin_save) { |
250 | if (restore_rwin_state(compat_ptr(uptr: rwin_save))) |
251 | goto segv; |
252 | } |
253 | |
254 | set_current_blocked(&set); |
255 | return; |
256 | segv: |
257 | force_sig(SIGSEGV); |
258 | } |
259 | |
260 | static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) |
261 | { |
262 | unsigned long sp; |
263 | |
264 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
265 | sp = regs->u_regs[UREG_FP]; |
266 | |
267 | /* |
268 | * If we are on the alternate signal stack and would overflow it, don't. |
269 | * Return an always-bogus address instead so we will die with SIGSEGV. |
270 | */ |
271 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) |
272 | return (void __user *) -1L; |
273 | |
274 | /* This is the X/Open sanctioned signal stack switching. */ |
275 | sp = sigsp(sp, ksig) - framesize; |
276 | |
277 | /* Always align the stack frame. This handles two cases. First, |
278 | * sigaltstack need not be mindful of platform specific stack |
279 | * alignment. Second, if we took this signal because the stack |
280 | * is not aligned properly, we'd like to take the signal cleanly |
281 | * and report that. |
282 | */ |
283 | sp &= ~15UL; |
284 | |
285 | return (void __user *) sp; |
286 | } |
287 | |
288 | /* The I-cache flush instruction only works in the primary ASI, which |
289 | * right now is the nucleus, aka. kernel space. |
290 | * |
291 | * Therefore we have to kick the instructions out using the kernel |
292 | * side linear mapping of the physical address backing the user |
293 | * instructions. |
294 | */ |
295 | static void flush_signal_insns(unsigned long address) |
296 | { |
297 | unsigned long pstate, paddr; |
298 | pte_t *ptep, pte; |
299 | pgd_t *pgdp; |
300 | p4d_t *p4dp; |
301 | pud_t *pudp; |
302 | pmd_t *pmdp; |
303 | |
304 | /* Commit all stores of the instructions we are about to flush. */ |
305 | wmb(); |
306 | |
307 | /* Disable cross-call reception. In this way even a very wide |
308 | * munmap() on another cpu can't tear down the page table |
309 | * hierarchy from underneath us, since that can't complete |
310 | * until the IPI tlb flush returns. |
311 | */ |
312 | |
313 | __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); |
314 | __asm__ __volatile__("wrpr %0, %1, %%pstate" |
315 | : : "r" (pstate), "i" (PSTATE_IE)); |
316 | |
317 | pgdp = pgd_offset(current->mm, address); |
318 | if (pgd_none(pgd: *pgdp)) |
319 | goto out_irqs_on; |
320 | p4dp = p4d_offset(pgd: pgdp, address); |
321 | if (p4d_none(p4d: *p4dp)) |
322 | goto out_irqs_on; |
323 | pudp = pud_offset(p4d: p4dp, address); |
324 | if (pud_none(pud: *pudp)) |
325 | goto out_irqs_on; |
326 | pmdp = pmd_offset(pud: pudp, address); |
327 | if (pmd_none(pmd: *pmdp)) |
328 | goto out_irqs_on; |
329 | |
330 | ptep = pte_offset_map(pmd: pmdp, addr: address); |
331 | if (!ptep) |
332 | goto out_irqs_on; |
333 | pte = *ptep; |
334 | if (!pte_present(a: pte)) |
335 | goto out_unmap; |
336 | |
337 | paddr = (unsigned long) page_address(pte_page(pte)); |
338 | |
339 | __asm__ __volatile__("flush %0 + %1" |
340 | : /* no outputs */ |
341 | : "r" (paddr), |
342 | "r" (address & (PAGE_SIZE - 1)) |
343 | : "memory" ); |
344 | |
345 | out_unmap: |
346 | pte_unmap(pte: ptep); |
347 | out_irqs_on: |
348 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); |
349 | |
350 | } |
351 | |
352 | static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, |
353 | sigset_t *oldset) |
354 | { |
355 | struct signal_frame32 __user *sf; |
356 | int i, err, wsaved; |
357 | void __user *tail; |
358 | int sigframe_size; |
359 | u32 psr; |
360 | compat_sigset_t seta; |
361 | |
362 | /* 1. Make sure everything is clean */ |
363 | synchronize_user_stack(); |
364 | save_and_clear_fpu(); |
365 | |
366 | wsaved = get_thread_wsaved(); |
367 | |
368 | sigframe_size = sizeof(*sf); |
369 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) |
370 | sigframe_size += sizeof(__siginfo_fpu_t); |
371 | if (wsaved) |
372 | sigframe_size += sizeof(__siginfo_rwin_t); |
373 | |
374 | sf = (struct signal_frame32 __user *) |
375 | get_sigframe(ksig, regs, framesize: sigframe_size); |
376 | |
377 | if (invalid_frame_pointer(fp: sf, fplen: sigframe_size)) { |
378 | if (show_unhandled_signals) |
379 | pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n" , |
380 | current->comm, current->pid, (unsigned long)sf, |
381 | regs->tpc, regs->u_regs[UREG_I7]); |
382 | force_sigsegv(sig: ksig->sig); |
383 | return -EINVAL; |
384 | } |
385 | |
386 | tail = (sf + 1); |
387 | |
388 | /* 2. Save the current process state */ |
389 | if (test_thread_flag(TIF_32BIT)) { |
390 | regs->tpc &= 0xffffffff; |
391 | regs->tnpc &= 0xffffffff; |
392 | } |
393 | err = put_user(regs->tpc, &sf->info.si_regs.pc); |
394 | err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); |
395 | err |= __put_user(regs->y, &sf->info.si_regs.y); |
396 | psr = tstate_to_psr(regs->tstate); |
397 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) |
398 | psr |= PSR_EF; |
399 | err |= __put_user(psr, &sf->info.si_regs.psr); |
400 | for (i = 0; i < 16; i++) |
401 | err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); |
402 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); |
403 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); |
404 | for (i = 1; i < 16; i++) |
405 | err |= __put_user(((u32 *)regs->u_regs)[2*i], |
406 | &sf->v8plus.g_upper[i]); |
407 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, |
408 | &sf->v8plus.asi); |
409 | |
410 | if (psr & PSR_EF) { |
411 | __siginfo_fpu_t __user *fp = tail; |
412 | tail += sizeof(*fp); |
413 | err |= save_fpu_state(regs, fp); |
414 | err |= __put_user((u64)fp, &sf->fpu_save); |
415 | } else { |
416 | err |= __put_user(0, &sf->fpu_save); |
417 | } |
418 | if (wsaved) { |
419 | __siginfo_rwin_t __user *rwp = tail; |
420 | tail += sizeof(*rwp); |
421 | err |= save_rwin_state(wsaved, rwp); |
422 | err |= __put_user((u64)rwp, &sf->rwin_save); |
423 | set_thread_wsaved(0); |
424 | } else { |
425 | err |= __put_user(0, &sf->rwin_save); |
426 | } |
427 | |
428 | /* If these change we need to know - assignments to seta relies on these sizes */ |
429 | BUILD_BUG_ON(_NSIG_WORDS != 1); |
430 | BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2); |
431 | seta.sig[1] = (oldset->sig[0] >> 32); |
432 | seta.sig[0] = oldset->sig[0]; |
433 | |
434 | err |= __put_user(seta.sig[0], &sf->info.si_mask); |
435 | err |= __copy_to_user(to: sf->extramask, from: &seta.sig[1], |
436 | n: (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
437 | |
438 | if (!wsaved) { |
439 | err |= raw_copy_in_user((u32 __user *)sf, |
440 | (u32 __user *)(regs->u_regs[UREG_FP]), |
441 | sizeof(struct reg_window32)); |
442 | } else { |
443 | struct reg_window *rp; |
444 | |
445 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; |
446 | for (i = 0; i < 8; i++) |
447 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); |
448 | for (i = 0; i < 6; i++) |
449 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); |
450 | err |= __put_user(rp->ins[6], &sf->ss.fp); |
451 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); |
452 | } |
453 | if (err) |
454 | return err; |
455 | |
456 | /* 3. signal handler back-trampoline and parameters */ |
457 | regs->u_regs[UREG_FP] = (unsigned long) sf; |
458 | regs->u_regs[UREG_I0] = ksig->sig; |
459 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
460 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; |
461 | |
462 | /* 4. signal handler */ |
463 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
464 | regs->tnpc = (regs->tpc + 4); |
465 | if (test_thread_flag(TIF_32BIT)) { |
466 | regs->tpc &= 0xffffffff; |
467 | regs->tnpc &= 0xffffffff; |
468 | } |
469 | |
470 | /* 5. return to kernel instructions */ |
471 | if (ksig->ka.ka_restorer) { |
472 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; |
473 | } else { |
474 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
475 | |
476 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); |
477 | |
478 | err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ |
479 | err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ |
480 | if (err) |
481 | return err; |
482 | flush_signal_insns(address); |
483 | } |
484 | return 0; |
485 | } |
486 | |
487 | static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, |
488 | sigset_t *oldset) |
489 | { |
490 | struct rt_signal_frame32 __user *sf; |
491 | int i, err, wsaved; |
492 | void __user *tail; |
493 | int sigframe_size; |
494 | u32 psr; |
495 | |
496 | /* 1. Make sure everything is clean */ |
497 | synchronize_user_stack(); |
498 | save_and_clear_fpu(); |
499 | |
500 | wsaved = get_thread_wsaved(); |
501 | |
502 | sigframe_size = sizeof(*sf); |
503 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) |
504 | sigframe_size += sizeof(__siginfo_fpu_t); |
505 | if (wsaved) |
506 | sigframe_size += sizeof(__siginfo_rwin_t); |
507 | |
508 | sf = (struct rt_signal_frame32 __user *) |
509 | get_sigframe(ksig, regs, framesize: sigframe_size); |
510 | |
511 | if (invalid_frame_pointer(fp: sf, fplen: sigframe_size)) { |
512 | if (show_unhandled_signals) |
513 | pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n" , |
514 | current->comm, current->pid, (unsigned long)sf, |
515 | regs->tpc, regs->u_regs[UREG_I7]); |
516 | force_sigsegv(sig: ksig->sig); |
517 | return -EINVAL; |
518 | } |
519 | |
520 | tail = (sf + 1); |
521 | |
522 | /* 2. Save the current process state */ |
523 | if (test_thread_flag(TIF_32BIT)) { |
524 | regs->tpc &= 0xffffffff; |
525 | regs->tnpc &= 0xffffffff; |
526 | } |
527 | err = put_user(regs->tpc, &sf->regs.pc); |
528 | err |= __put_user(regs->tnpc, &sf->regs.npc); |
529 | err |= __put_user(regs->y, &sf->regs.y); |
530 | psr = tstate_to_psr(regs->tstate); |
531 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) |
532 | psr |= PSR_EF; |
533 | err |= __put_user(psr, &sf->regs.psr); |
534 | for (i = 0; i < 16; i++) |
535 | err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); |
536 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); |
537 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); |
538 | for (i = 1; i < 16; i++) |
539 | err |= __put_user(((u32 *)regs->u_regs)[2*i], |
540 | &sf->v8plus.g_upper[i]); |
541 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, |
542 | &sf->v8plus.asi); |
543 | |
544 | if (psr & PSR_EF) { |
545 | __siginfo_fpu_t __user *fp = tail; |
546 | tail += sizeof(*fp); |
547 | err |= save_fpu_state(regs, fp); |
548 | err |= __put_user((u64)fp, &sf->fpu_save); |
549 | } else { |
550 | err |= __put_user(0, &sf->fpu_save); |
551 | } |
552 | if (wsaved) { |
553 | __siginfo_rwin_t __user *rwp = tail; |
554 | tail += sizeof(*rwp); |
555 | err |= save_rwin_state(wsaved, rwp); |
556 | err |= __put_user((u64)rwp, &sf->rwin_save); |
557 | set_thread_wsaved(0); |
558 | } else { |
559 | err |= __put_user(0, &sf->rwin_save); |
560 | } |
561 | |
562 | /* Update the siginfo structure. */ |
563 | err |= copy_siginfo_to_user32(to: &sf->info, from: &ksig->info); |
564 | |
565 | /* Setup sigaltstack */ |
566 | err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); |
567 | |
568 | err |= put_compat_sigset(compat: &sf->mask, set: oldset, size: sizeof(compat_sigset_t)); |
569 | |
570 | if (!wsaved) { |
571 | err |= raw_copy_in_user((u32 __user *)sf, |
572 | (u32 __user *)(regs->u_regs[UREG_FP]), |
573 | sizeof(struct reg_window32)); |
574 | } else { |
575 | struct reg_window *rp; |
576 | |
577 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; |
578 | for (i = 0; i < 8; i++) |
579 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); |
580 | for (i = 0; i < 6; i++) |
581 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); |
582 | err |= __put_user(rp->ins[6], &sf->ss.fp); |
583 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); |
584 | } |
585 | if (err) |
586 | return err; |
587 | |
588 | /* 3. signal handler back-trampoline and parameters */ |
589 | regs->u_regs[UREG_FP] = (unsigned long) sf; |
590 | regs->u_regs[UREG_I0] = ksig->sig; |
591 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
592 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; |
593 | |
594 | /* 4. signal handler */ |
595 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
596 | regs->tnpc = (regs->tpc + 4); |
597 | if (test_thread_flag(TIF_32BIT)) { |
598 | regs->tpc &= 0xffffffff; |
599 | regs->tnpc &= 0xffffffff; |
600 | } |
601 | |
602 | /* 5. return to kernel instructions */ |
603 | if (ksig->ka.ka_restorer) |
604 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; |
605 | else { |
606 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
607 | |
608 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); |
609 | |
610 | /* mov __NR_rt_sigreturn, %g1 */ |
611 | err |= __put_user(0x82102065, &sf->insns[0]); |
612 | |
613 | /* t 0x10 */ |
614 | err |= __put_user(0x91d02010, &sf->insns[1]); |
615 | if (err) |
616 | return err; |
617 | |
618 | flush_signal_insns(address); |
619 | } |
620 | return 0; |
621 | } |
622 | |
623 | static inline void handle_signal32(struct ksignal *ksig, |
624 | struct pt_regs *regs) |
625 | { |
626 | sigset_t *oldset = sigmask_to_save(); |
627 | int err; |
628 | |
629 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
630 | err = setup_rt_frame32(ksig, regs, oldset); |
631 | else |
632 | err = setup_frame32(ksig, regs, oldset); |
633 | |
634 | signal_setup_done(failed: err, ksig, stepping: 0); |
635 | } |
636 | |
637 | static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, |
638 | struct sigaction *sa) |
639 | { |
640 | switch (regs->u_regs[UREG_I0]) { |
641 | case ERESTART_RESTARTBLOCK: |
642 | case ERESTARTNOHAND: |
643 | no_system_call_restart: |
644 | regs->u_regs[UREG_I0] = EINTR; |
645 | regs->tstate |= TSTATE_ICARRY; |
646 | break; |
647 | case ERESTARTSYS: |
648 | if (!(sa->sa_flags & SA_RESTART)) |
649 | goto no_system_call_restart; |
650 | fallthrough; |
651 | case ERESTARTNOINTR: |
652 | regs->u_regs[UREG_I0] = orig_i0; |
653 | regs->tpc -= 4; |
654 | regs->tnpc -= 4; |
655 | } |
656 | } |
657 | |
658 | /* Note that 'init' is a special process: it doesn't get signals it doesn't |
659 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
660 | * mistake. |
661 | */ |
662 | void do_signal32(struct pt_regs * regs) |
663 | { |
664 | struct ksignal ksig; |
665 | unsigned long orig_i0 = 0; |
666 | int restart_syscall = 0; |
667 | bool has_handler = get_signal(ksig: &ksig); |
668 | |
669 | if (pt_regs_is_syscall(regs) && |
670 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { |
671 | restart_syscall = 1; |
672 | orig_i0 = regs->u_regs[UREG_G6]; |
673 | } |
674 | |
675 | if (has_handler) { |
676 | if (restart_syscall) |
677 | syscall_restart32(orig_i0, regs, sa: &ksig.ka.sa); |
678 | handle_signal32(ksig: &ksig, regs); |
679 | } else { |
680 | if (restart_syscall) { |
681 | switch (regs->u_regs[UREG_I0]) { |
682 | case ERESTARTNOHAND: |
683 | case ERESTARTSYS: |
684 | case ERESTARTNOINTR: |
685 | /* replay the system call when we are done */ |
686 | regs->u_regs[UREG_I0] = orig_i0; |
687 | regs->tpc -= 4; |
688 | regs->tnpc -= 4; |
689 | pt_regs_clear_syscall(regs); |
690 | fallthrough; |
691 | case ERESTART_RESTARTBLOCK: |
692 | regs->u_regs[UREG_G1] = __NR_restart_syscall; |
693 | regs->tpc -= 4; |
694 | regs->tnpc -= 4; |
695 | pt_regs_clear_syscall(regs); |
696 | } |
697 | } |
698 | restore_saved_sigmask(); |
699 | } |
700 | } |
701 | |
702 | struct sigstack32 { |
703 | u32 the_stack; |
704 | int cur_status; |
705 | }; |
706 | |
707 | asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) |
708 | { |
709 | struct sigstack32 __user *ssptr = |
710 | (struct sigstack32 __user *)((unsigned long)(u_ssptr)); |
711 | struct sigstack32 __user *ossptr = |
712 | (struct sigstack32 __user *)((unsigned long)(u_ossptr)); |
713 | int ret = -EFAULT; |
714 | |
715 | /* First see if old state is wanted. */ |
716 | if (ossptr) { |
717 | if (put_user(current->sas_ss_sp + current->sas_ss_size, |
718 | &ossptr->the_stack) || |
719 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) |
720 | goto out; |
721 | } |
722 | |
723 | /* Now see if we want to update the new state. */ |
724 | if (ssptr) { |
725 | u32 ss_sp; |
726 | |
727 | if (get_user(ss_sp, &ssptr->the_stack)) |
728 | goto out; |
729 | |
730 | /* If the current stack was set with sigaltstack, don't |
731 | * swap stacks while we are on it. |
732 | */ |
733 | ret = -EPERM; |
734 | if (current->sas_ss_sp && on_sig_stack(sp)) |
735 | goto out; |
736 | |
737 | /* Since we don't know the extent of the stack, and we don't |
738 | * track onstack-ness, but rather calculate it, we must |
739 | * presume a size. Ho hum this interface is lossy. |
740 | */ |
741 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; |
742 | current->sas_ss_size = SIGSTKSZ; |
743 | } |
744 | |
745 | ret = 0; |
746 | out: |
747 | return ret; |
748 | } |
749 | |
750 | /* |
751 | * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as |
752 | * changes likely come with new fields that should be added below. |
753 | */ |
754 | static_assert(NSIGILL == 11); |
755 | static_assert(NSIGFPE == 15); |
756 | static_assert(NSIGSEGV == 10); |
757 | static_assert(NSIGBUS == 5); |
758 | static_assert(NSIGTRAP == 6); |
759 | static_assert(NSIGCHLD == 6); |
760 | static_assert(NSIGSYS == 2); |
761 | static_assert(sizeof(compat_siginfo_t) == 128); |
762 | static_assert(__alignof__(compat_siginfo_t) == 4); |
763 | static_assert(offsetof(compat_siginfo_t, si_signo) == 0x00); |
764 | static_assert(offsetof(compat_siginfo_t, si_errno) == 0x04); |
765 | static_assert(offsetof(compat_siginfo_t, si_code) == 0x08); |
766 | static_assert(offsetof(compat_siginfo_t, si_pid) == 0x0c); |
767 | static_assert(offsetof(compat_siginfo_t, si_uid) == 0x10); |
768 | static_assert(offsetof(compat_siginfo_t, si_tid) == 0x0c); |
769 | static_assert(offsetof(compat_siginfo_t, si_overrun) == 0x10); |
770 | static_assert(offsetof(compat_siginfo_t, si_status) == 0x14); |
771 | static_assert(offsetof(compat_siginfo_t, si_utime) == 0x18); |
772 | static_assert(offsetof(compat_siginfo_t, si_stime) == 0x1c); |
773 | static_assert(offsetof(compat_siginfo_t, si_value) == 0x14); |
774 | static_assert(offsetof(compat_siginfo_t, si_int) == 0x14); |
775 | static_assert(offsetof(compat_siginfo_t, si_ptr) == 0x14); |
776 | static_assert(offsetof(compat_siginfo_t, si_addr) == 0x0c); |
777 | static_assert(offsetof(compat_siginfo_t, si_trapno) == 0x10); |
778 | static_assert(offsetof(compat_siginfo_t, si_addr_lsb) == 0x10); |
779 | static_assert(offsetof(compat_siginfo_t, si_lower) == 0x14); |
780 | static_assert(offsetof(compat_siginfo_t, si_upper) == 0x18); |
781 | static_assert(offsetof(compat_siginfo_t, si_pkey) == 0x14); |
782 | static_assert(offsetof(compat_siginfo_t, si_perf_data) == 0x10); |
783 | static_assert(offsetof(compat_siginfo_t, si_perf_type) == 0x14); |
784 | static_assert(offsetof(compat_siginfo_t, si_perf_flags) == 0x18); |
785 | static_assert(offsetof(compat_siginfo_t, si_band) == 0x0c); |
786 | static_assert(offsetof(compat_siginfo_t, si_fd) == 0x10); |
787 | |