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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5526b7e4 | 2 | /* arch/sparc64/kernel/signal32.c |
1da177e4 LT |
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> | |
1da177e4 LT |
20 | #include <linux/binfmts.h> |
21 | #include <linux/compat.h> | |
22 | #include <linux/bitops.h> | |
95698466 | 23 | #include <linux/tracehook.h> |
1da177e4 | 24 | |
7c0f6ba6 | 25 | #include <linux/uaccess.h> |
1da177e4 | 26 | #include <asm/ptrace.h> |
1da177e4 LT |
27 | #include <asm/pgtable.h> |
28 | #include <asm/psrcompat.h> | |
29 | #include <asm/fpumacro.h> | |
30 | #include <asm/visasm.h> | |
14cc6aba | 31 | #include <asm/compat_signal.h> |
d550bbd4 | 32 | #include <asm/switch_to.h> |
1da177e4 | 33 | |
5598473a | 34 | #include "sigutil.h" |
abaff455 | 35 | #include "kernel.h" |
5598473a | 36 | |
1da177e4 LT |
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 | ||
5526b7e4 | 47 | struct signal_frame32 { |
1da177e4 LT |
48 | struct sparc_stackf32 ss; |
49 | __siginfo32_t info; | |
5598473a | 50 | /* __siginfo_fpu_t * */ u32 fpu_save; |
1da177e4 LT |
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; | |
5598473a DM |
56 | /* __siginfo_rwin_t * */u32 rwin_save; |
57 | } __attribute__((aligned(8))); | |
1da177e4 | 58 | |
1da177e4 LT |
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; | |
5598473a | 64 | /* __siginfo_fpu_t * */ u32 fpu_save; |
1da177e4 | 65 | unsigned int insns[2]; |
99b06feb | 66 | compat_stack_t stack; |
1da177e4 LT |
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; | |
5598473a DM |
70 | /* __siginfo_rwin_t * */u32 rwin_save; |
71 | } __attribute__((aligned(8))); | |
1da177e4 | 72 | |
ce395960 | 73 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) |
1da177e4 LT |
74 | { |
75 | int err; | |
76 | ||
77 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
78 | return -EFAULT; | |
79 | ||
80 | /* If you change siginfo_t structure, please be sure | |
81 | this code is fixed accordingly. | |
82 | It should never copy any pad contained in the structure | |
83 | to avoid security leaks, but must copy the generic | |
84 | 3 ints plus the relevant union member. | |
85 | This routine must convert siginfo from 64bit to 32bit as well | |
86 | at the same time. */ | |
87 | err = __put_user(from->si_signo, &to->si_signo); | |
88 | err |= __put_user(from->si_errno, &to->si_errno); | |
cc731525 | 89 | err |= __put_user(from->si_code, &to->si_code); |
1da177e4 LT |
90 | if (from->si_code < 0) |
91 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
92 | else { | |
cc731525 EB |
93 | switch (siginfo_layout(from->si_signo, from->si_code)) { |
94 | case SIL_TIMER: | |
1da177e4 LT |
95 | err |= __put_user(from->si_tid, &to->si_tid); |
96 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
97 | err |= __put_user(from->si_int, &to->si_int); | |
98 | break; | |
cc731525 | 99 | case SIL_CHLD: |
1da177e4 LT |
100 | err |= __put_user(from->si_utime, &to->si_utime); |
101 | err |= __put_user(from->si_stime, &to->si_stime); | |
102 | err |= __put_user(from->si_status, &to->si_status); | |
103 | default: | |
cc731525 | 104 | case SIL_KILL: |
1da177e4 LT |
105 | err |= __put_user(from->si_pid, &to->si_pid); |
106 | err |= __put_user(from->si_uid, &to->si_uid); | |
107 | break; | |
cc731525 | 108 | case SIL_FAULT: |
1da177e4 LT |
109 | err |= __put_user(from->si_trapno, &to->si_trapno); |
110 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); | |
111 | break; | |
cc731525 | 112 | case SIL_POLL: |
9c7d3b3a JS |
113 | err |= __put_user(from->si_band, &to->si_band); |
114 | err |= __put_user(from->si_fd, &to->si_fd); | |
115 | break; | |
cc731525 | 116 | case SIL_RT: |
1da177e4 LT |
117 | err |= __put_user(from->si_pid, &to->si_pid); |
118 | err |= __put_user(from->si_uid, &to->si_uid); | |
119 | err |= __put_user(from->si_int, &to->si_int); | |
120 | break; | |
121 | } | |
122 | } | |
123 | return err; | |
124 | } | |
125 | ||
126 | /* CAUTION: This is just a very minimalist implementation for the | |
127 | * sake of compat_sys_rt_sigqueueinfo() | |
128 | */ | |
129 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
130 | { | |
131 | if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) | |
132 | return -EFAULT; | |
133 | ||
134 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
135 | copy_from_user(to->_sifields._pad, from->_sifields._pad, | |
136 | SI_PAD_SIZE)) | |
137 | return -EFAULT; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
d11c2a0d DM |
142 | /* Checks if the fp is valid. We always build signal frames which are |
143 | * 16-byte aligned, therefore we can always enforce that the restore | |
144 | * frame has that property as well. | |
145 | */ | |
146 | static bool invalid_frame_pointer(void __user *fp, int fplen) | |
147 | { | |
148 | if ((((unsigned long) fp) & 15) || | |
149 | ((unsigned long)fp) > 0x100000000ULL - fplen) | |
150 | return true; | |
151 | return false; | |
152 | } | |
153 | ||
5526b7e4 | 154 | void do_sigreturn32(struct pt_regs *regs) |
1da177e4 | 155 | { |
5526b7e4 | 156 | struct signal_frame32 __user *sf; |
5598473a DM |
157 | compat_uptr_t fpu_save; |
158 | compat_uptr_t rwin_save; | |
d11c2a0d | 159 | unsigned int psr, ufp; |
9ef595d8 | 160 | unsigned int pc, npc; |
1da177e4 | 161 | sigset_t set; |
c19ac326 | 162 | compat_sigset_t seta; |
1da177e4 LT |
163 | int err, i; |
164 | ||
5526b7e4 | 165 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 166 | current->restart_block.fn = do_no_restart_syscall; |
5526b7e4 DM |
167 | |
168 | synchronize_user_stack(); | |
169 | ||
1da177e4 | 170 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
5526b7e4 | 171 | sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; |
1da177e4 LT |
172 | |
173 | /* 1. Make sure we are not getting garbage from the user */ | |
d11c2a0d DM |
174 | if (invalid_frame_pointer(sf, sizeof(*sf))) |
175 | goto segv; | |
176 | ||
177 | if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP])) | |
178 | goto segv; | |
179 | ||
180 | if (ufp & 0x7) | |
1da177e4 LT |
181 | goto segv; |
182 | ||
d11c2a0d | 183 | if (__get_user(pc, &sf->info.si_regs.pc) || |
187cd44e AV |
184 | __get_user(npc, &sf->info.si_regs.npc)) |
185 | goto segv; | |
1da177e4 LT |
186 | |
187 | if ((pc | npc) & 3) | |
188 | goto segv; | |
189 | ||
190 | if (test_thread_flag(TIF_32BIT)) { | |
191 | pc &= 0xffffffff; | |
192 | npc &= 0xffffffff; | |
193 | } | |
194 | regs->tpc = pc; | |
195 | regs->tnpc = npc; | |
196 | ||
197 | /* 2. Restore the state */ | |
198 | err = __get_user(regs->y, &sf->info.si_regs.y); | |
199 | err |= __get_user(psr, &sf->info.si_regs.psr); | |
200 | ||
201 | for (i = UREG_G1; i <= UREG_I7; i++) | |
202 | err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
203 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
204 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
205 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
206 | unsigned long asi; | |
207 | ||
208 | for (i = UREG_G1; i <= UREG_I7; i++) | |
209 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
210 | err |= __get_user(asi, &sf->v8plus.asi); | |
211 | regs->tstate &= ~TSTATE_ASI; | |
212 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
213 | } | |
214 | } | |
215 | ||
216 | /* User can only change condition codes in %tstate. */ | |
217 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
218 | regs->tstate |= psr_to_tstate_icc(psr); | |
219 | ||
2678fefe | 220 | /* Prevent syscall restart. */ |
28e61036 | 221 | pt_regs_clear_syscall(regs); |
2678fefe | 222 | |
1da177e4 | 223 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
224 | if (!err && fpu_save) |
225 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
226 | err |= __get_user(rwin_save, &sf->rwin_save); | |
227 | if (!err && rwin_save) { | |
228 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
229 | goto segv; | |
230 | } | |
c19ac326 SR |
231 | err |= __get_user(seta.sig[0], &sf->info.si_mask); |
232 | err |= copy_from_user(&seta.sig[1], &sf->extramask, | |
1da177e4 LT |
233 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
234 | if (err) | |
235 | goto segv; | |
c19ac326 SR |
236 | |
237 | set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); | |
faddf598 | 238 | set_current_blocked(&set); |
1da177e4 LT |
239 | return; |
240 | ||
241 | segv: | |
242 | force_sig(SIGSEGV, current); | |
243 | } | |
244 | ||
1da177e4 LT |
245 | asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
246 | { | |
247 | struct rt_signal_frame32 __user *sf; | |
d11c2a0d | 248 | unsigned int psr, pc, npc, ufp; |
5598473a DM |
249 | compat_uptr_t fpu_save; |
250 | compat_uptr_t rwin_save; | |
1da177e4 LT |
251 | sigset_t set; |
252 | compat_sigset_t seta; | |
1da177e4 LT |
253 | int err, i; |
254 | ||
255 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 256 | current->restart_block.fn = do_no_restart_syscall; |
1da177e4 LT |
257 | |
258 | synchronize_user_stack(); | |
259 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
260 | sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; | |
261 | ||
262 | /* 1. Make sure we are not getting garbage from the user */ | |
d11c2a0d | 263 | if (invalid_frame_pointer(sf, sizeof(*sf))) |
1da177e4 LT |
264 | goto segv; |
265 | ||
d11c2a0d DM |
266 | if (get_user(ufp, &sf->regs.u_regs[UREG_FP])) |
267 | goto segv; | |
268 | ||
269 | if (ufp & 0x7) | |
270 | goto segv; | |
271 | ||
272 | if (__get_user(pc, &sf->regs.pc) || | |
187cd44e AV |
273 | __get_user(npc, &sf->regs.npc)) |
274 | goto segv; | |
1da177e4 LT |
275 | |
276 | if ((pc | npc) & 3) | |
277 | goto segv; | |
278 | ||
279 | if (test_thread_flag(TIF_32BIT)) { | |
280 | pc &= 0xffffffff; | |
281 | npc &= 0xffffffff; | |
282 | } | |
283 | regs->tpc = pc; | |
284 | regs->tnpc = npc; | |
285 | ||
286 | /* 2. Restore the state */ | |
287 | err = __get_user(regs->y, &sf->regs.y); | |
288 | err |= __get_user(psr, &sf->regs.psr); | |
289 | ||
290 | for (i = UREG_G1; i <= UREG_I7; i++) | |
291 | err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
292 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
293 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
294 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
295 | unsigned long asi; | |
296 | ||
297 | for (i = UREG_G1; i <= UREG_I7; i++) | |
298 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
299 | err |= __get_user(asi, &sf->v8plus.asi); | |
300 | regs->tstate &= ~TSTATE_ASI; | |
301 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
302 | } | |
303 | } | |
304 | ||
305 | /* User can only change condition codes in %tstate. */ | |
306 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
307 | regs->tstate |= psr_to_tstate_icc(psr); | |
308 | ||
2678fefe | 309 | /* Prevent syscall restart. */ |
28e61036 | 310 | pt_regs_clear_syscall(regs); |
2678fefe | 311 | |
1da177e4 | 312 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
313 | if (!err && fpu_save) |
314 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
1da177e4 | 315 | err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t)); |
99b06feb | 316 | err |= compat_restore_altstack(&sf->stack); |
1da177e4 LT |
317 | if (err) |
318 | goto segv; | |
319 | ||
5598473a DM |
320 | err |= __get_user(rwin_save, &sf->rwin_save); |
321 | if (!err && rwin_save) { | |
322 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
323 | goto segv; | |
324 | } | |
325 | ||
c19ac326 | 326 | set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); |
faddf598 | 327 | set_current_blocked(&set); |
1da177e4 LT |
328 | return; |
329 | segv: | |
330 | force_sig(SIGSEGV, current); | |
331 | } | |
332 | ||
08f73957 | 333 | static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) |
1da177e4 LT |
334 | { |
335 | unsigned long sp; | |
336 | ||
337 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
338 | sp = regs->u_regs[UREG_FP]; | |
339 | ||
dc5dc7e6 DM |
340 | /* |
341 | * If we are on the alternate signal stack and would overflow it, don't. | |
342 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
343 | */ | |
344 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) | |
345 | return (void __user *) -1L; | |
346 | ||
1da177e4 | 347 | /* This is the X/Open sanctioned signal stack switching. */ |
08f73957 | 348 | sp = sigsp(sp, ksig) - framesize; |
f036d9f3 | 349 | |
dc5dc7e6 DM |
350 | /* Always align the stack frame. This handles two cases. First, |
351 | * sigaltstack need not be mindful of platform specific stack | |
352 | * alignment. Second, if we took this signal because the stack | |
353 | * is not aligned properly, we'd like to take the signal cleanly | |
354 | * and report that. | |
355 | */ | |
f036d9f3 | 356 | sp &= ~15UL; |
dc5dc7e6 | 357 | |
f036d9f3 | 358 | return (void __user *) sp; |
1da177e4 LT |
359 | } |
360 | ||
05c5e769 DM |
361 | /* The I-cache flush instruction only works in the primary ASI, which |
362 | * right now is the nucleus, aka. kernel space. | |
363 | * | |
364 | * Therefore we have to kick the instructions out using the kernel | |
365 | * side linear mapping of the physical address backing the user | |
366 | * instructions. | |
367 | */ | |
368 | static void flush_signal_insns(unsigned long address) | |
369 | { | |
370 | unsigned long pstate, paddr; | |
371 | pte_t *ptep, pte; | |
372 | pgd_t *pgdp; | |
373 | pud_t *pudp; | |
374 | pmd_t *pmdp; | |
375 | ||
376 | /* Commit all stores of the instructions we are about to flush. */ | |
377 | wmb(); | |
378 | ||
379 | /* Disable cross-call reception. In this way even a very wide | |
380 | * munmap() on another cpu can't tear down the page table | |
381 | * hierarchy from underneath us, since that can't complete | |
382 | * until the IPI tlb flush returns. | |
383 | */ | |
384 | ||
385 | __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); | |
386 | __asm__ __volatile__("wrpr %0, %1, %%pstate" | |
387 | : : "r" (pstate), "i" (PSTATE_IE)); | |
388 | ||
389 | pgdp = pgd_offset(current->mm, address); | |
390 | if (pgd_none(*pgdp)) | |
391 | goto out_irqs_on; | |
392 | pudp = pud_offset(pgdp, address); | |
393 | if (pud_none(*pudp)) | |
394 | goto out_irqs_on; | |
395 | pmdp = pmd_offset(pudp, address); | |
396 | if (pmd_none(*pmdp)) | |
397 | goto out_irqs_on; | |
398 | ||
399 | ptep = pte_offset_map(pmdp, address); | |
400 | pte = *ptep; | |
401 | if (!pte_present(pte)) | |
402 | goto out_unmap; | |
403 | ||
404 | paddr = (unsigned long) page_address(pte_page(pte)); | |
405 | ||
406 | __asm__ __volatile__("flush %0 + %1" | |
407 | : /* no outputs */ | |
408 | : "r" (paddr), | |
409 | "r" (address & (PAGE_SIZE - 1)) | |
410 | : "memory"); | |
411 | ||
412 | out_unmap: | |
413 | pte_unmap(ptep); | |
414 | out_irqs_on: | |
415 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); | |
416 | ||
417 | } | |
418 | ||
08f73957 AV |
419 | static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, |
420 | sigset_t *oldset) | |
1da177e4 | 421 | { |
5526b7e4 | 422 | struct signal_frame32 __user *sf; |
5598473a DM |
423 | int i, err, wsaved; |
424 | void __user *tail; | |
1da177e4 LT |
425 | int sigframe_size; |
426 | u32 psr; | |
c19ac326 | 427 | compat_sigset_t seta; |
1da177e4 LT |
428 | |
429 | /* 1. Make sure everything is clean */ | |
430 | synchronize_user_stack(); | |
431 | save_and_clear_fpu(); | |
432 | ||
5598473a DM |
433 | wsaved = get_thread_wsaved(); |
434 | ||
435 | sigframe_size = sizeof(*sf); | |
436 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
437 | sigframe_size += sizeof(__siginfo_fpu_t); | |
438 | if (wsaved) | |
439 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 | 440 | |
5526b7e4 | 441 | sf = (struct signal_frame32 __user *) |
08f73957 | 442 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 443 | |
08f73957 AV |
444 | if (invalid_frame_pointer(sf, sigframe_size)) { |
445 | do_exit(SIGILL); | |
446 | return -EINVAL; | |
447 | } | |
1da177e4 | 448 | |
5598473a | 449 | tail = (sf + 1); |
1da177e4 LT |
450 | |
451 | /* 2. Save the current process state */ | |
452 | if (test_thread_flag(TIF_32BIT)) { | |
453 | regs->tpc &= 0xffffffff; | |
454 | regs->tnpc &= 0xffffffff; | |
455 | } | |
456 | err = put_user(regs->tpc, &sf->info.si_regs.pc); | |
457 | err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); | |
458 | err |= __put_user(regs->y, &sf->info.si_regs.y); | |
459 | psr = tstate_to_psr(regs->tstate); | |
460 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
461 | psr |= PSR_EF; | |
462 | err |= __put_user(psr, &sf->info.si_regs.psr); | |
463 | for (i = 0; i < 16; i++) | |
464 | err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
465 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
466 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
467 | for (i = 1; i < 16; i++) | |
468 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
469 | &sf->v8plus.g_upper[i]); | |
470 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
471 | &sf->v8plus.asi); | |
472 | ||
473 | if (psr & PSR_EF) { | |
5598473a DM |
474 | __siginfo_fpu_t __user *fp = tail; |
475 | tail += sizeof(*fp); | |
476 | err |= save_fpu_state(regs, fp); | |
477 | err |= __put_user((u64)fp, &sf->fpu_save); | |
1da177e4 LT |
478 | } else { |
479 | err |= __put_user(0, &sf->fpu_save); | |
480 | } | |
5598473a DM |
481 | if (wsaved) { |
482 | __siginfo_rwin_t __user *rwp = tail; | |
483 | tail += sizeof(*rwp); | |
484 | err |= save_rwin_state(wsaved, rwp); | |
485 | err |= __put_user((u64)rwp, &sf->rwin_save); | |
486 | set_thread_wsaved(0); | |
487 | } else { | |
488 | err |= __put_user(0, &sf->rwin_save); | |
489 | } | |
1da177e4 | 490 | |
c19ac326 SR |
491 | /* If these change we need to know - assignments to seta relies on these sizes */ |
492 | BUILD_BUG_ON(_NSIG_WORDS != 1); | |
493 | BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2); | |
494 | seta.sig[1] = (oldset->sig[0] >> 32); | |
495 | seta.sig[0] = oldset->sig[0]; | |
496 | ||
497 | err |= __put_user(seta.sig[0], &sf->info.si_mask); | |
498 | err |= __copy_to_user(sf->extramask, &seta.sig[1], | |
1da177e4 LT |
499 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
500 | ||
5598473a DM |
501 | if (!wsaved) { |
502 | err |= copy_in_user((u32 __user *)sf, | |
503 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
504 | sizeof(struct reg_window32)); | |
505 | } else { | |
506 | struct reg_window *rp; | |
507 | ||
508 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
509 | for (i = 0; i < 8; i++) | |
510 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); | |
511 | for (i = 0; i < 6; i++) | |
512 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); | |
513 | err |= __put_user(rp->ins[6], &sf->ss.fp); | |
514 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); | |
515 | } | |
1da177e4 | 516 | if (err) |
08f73957 | 517 | return err; |
1da177e4 LT |
518 | |
519 | /* 3. signal handler back-trampoline and parameters */ | |
520 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 521 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
522 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
523 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
524 | ||
525 | /* 4. signal handler */ | |
08f73957 | 526 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
527 | regs->tnpc = (regs->tpc + 4); |
528 | if (test_thread_flag(TIF_32BIT)) { | |
529 | regs->tpc &= 0xffffffff; | |
530 | regs->tnpc &= 0xffffffff; | |
531 | } | |
532 | ||
533 | /* 5. return to kernel instructions */ | |
08f73957 AV |
534 | if (ksig->ka.ka_restorer) { |
535 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 | 536 | } else { |
1da177e4 | 537 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
538 | |
539 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
540 | ||
541 | err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ | |
542 | err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ | |
543 | if (err) | |
08f73957 | 544 | return err; |
05c5e769 | 545 | flush_signal_insns(address); |
1da177e4 | 546 | } |
c2785259 | 547 | return 0; |
1da177e4 LT |
548 | } |
549 | ||
08f73957 AV |
550 | static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, |
551 | sigset_t *oldset) | |
1da177e4 LT |
552 | { |
553 | struct rt_signal_frame32 __user *sf; | |
5598473a DM |
554 | int i, err, wsaved; |
555 | void __user *tail; | |
1da177e4 LT |
556 | int sigframe_size; |
557 | u32 psr; | |
1da177e4 LT |
558 | compat_sigset_t seta; |
559 | ||
560 | /* 1. Make sure everything is clean */ | |
561 | synchronize_user_stack(); | |
562 | save_and_clear_fpu(); | |
563 | ||
5598473a DM |
564 | wsaved = get_thread_wsaved(); |
565 | ||
566 | sigframe_size = sizeof(*sf); | |
567 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
568 | sigframe_size += sizeof(__siginfo_fpu_t); | |
569 | if (wsaved) | |
570 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 LT |
571 | |
572 | sf = (struct rt_signal_frame32 __user *) | |
08f73957 | 573 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 574 | |
08f73957 AV |
575 | if (invalid_frame_pointer(sf, sigframe_size)) { |
576 | do_exit(SIGILL); | |
577 | return -EINVAL; | |
578 | } | |
1da177e4 | 579 | |
5598473a | 580 | tail = (sf + 1); |
1da177e4 LT |
581 | |
582 | /* 2. Save the current process state */ | |
583 | if (test_thread_flag(TIF_32BIT)) { | |
584 | regs->tpc &= 0xffffffff; | |
585 | regs->tnpc &= 0xffffffff; | |
586 | } | |
587 | err = put_user(regs->tpc, &sf->regs.pc); | |
588 | err |= __put_user(regs->tnpc, &sf->regs.npc); | |
589 | err |= __put_user(regs->y, &sf->regs.y); | |
590 | psr = tstate_to_psr(regs->tstate); | |
591 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
592 | psr |= PSR_EF; | |
593 | err |= __put_user(psr, &sf->regs.psr); | |
594 | for (i = 0; i < 16; i++) | |
595 | err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
596 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
597 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
598 | for (i = 1; i < 16; i++) | |
599 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
600 | &sf->v8plus.g_upper[i]); | |
601 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
602 | &sf->v8plus.asi); | |
603 | ||
604 | if (psr & PSR_EF) { | |
5598473a DM |
605 | __siginfo_fpu_t __user *fp = tail; |
606 | tail += sizeof(*fp); | |
607 | err |= save_fpu_state(regs, fp); | |
608 | err |= __put_user((u64)fp, &sf->fpu_save); | |
1da177e4 LT |
609 | } else { |
610 | err |= __put_user(0, &sf->fpu_save); | |
611 | } | |
5598473a DM |
612 | if (wsaved) { |
613 | __siginfo_rwin_t __user *rwp = tail; | |
614 | tail += sizeof(*rwp); | |
615 | err |= save_rwin_state(wsaved, rwp); | |
616 | err |= __put_user((u64)rwp, &sf->rwin_save); | |
617 | set_thread_wsaved(0); | |
618 | } else { | |
619 | err |= __put_user(0, &sf->rwin_save); | |
620 | } | |
1da177e4 LT |
621 | |
622 | /* Update the siginfo structure. */ | |
08f73957 | 623 | err |= copy_siginfo_to_user32(&sf->info, &ksig->info); |
1da177e4 LT |
624 | |
625 | /* Setup sigaltstack */ | |
99b06feb | 626 | err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); |
1da177e4 | 627 | |
c19ac326 SR |
628 | seta.sig[1] = (oldset->sig[0] >> 32); |
629 | seta.sig[0] = oldset->sig[0]; | |
1da177e4 LT |
630 | err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t)); |
631 | ||
5598473a DM |
632 | if (!wsaved) { |
633 | err |= copy_in_user((u32 __user *)sf, | |
634 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
635 | sizeof(struct reg_window32)); | |
636 | } else { | |
637 | struct reg_window *rp; | |
638 | ||
639 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
640 | for (i = 0; i < 8; i++) | |
641 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); | |
642 | for (i = 0; i < 6; i++) | |
643 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); | |
644 | err |= __put_user(rp->ins[6], &sf->ss.fp); | |
645 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); | |
646 | } | |
1da177e4 | 647 | if (err) |
08f73957 | 648 | return err; |
1da177e4 LT |
649 | |
650 | /* 3. signal handler back-trampoline and parameters */ | |
651 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 652 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
653 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
654 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
655 | ||
656 | /* 4. signal handler */ | |
08f73957 | 657 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
658 | regs->tnpc = (regs->tpc + 4); |
659 | if (test_thread_flag(TIF_32BIT)) { | |
660 | regs->tpc &= 0xffffffff; | |
661 | regs->tnpc &= 0xffffffff; | |
662 | } | |
663 | ||
664 | /* 5. return to kernel instructions */ | |
08f73957 AV |
665 | if (ksig->ka.ka_restorer) |
666 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 | 667 | else { |
1da177e4 | 668 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
669 | |
670 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
671 | ||
672 | /* mov __NR_rt_sigreturn, %g1 */ | |
673 | err |= __put_user(0x82102065, &sf->insns[0]); | |
674 | ||
675 | /* t 0x10 */ | |
676 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
677 | if (err) | |
08f73957 | 678 | return err; |
1da177e4 | 679 | |
05c5e769 | 680 | flush_signal_insns(address); |
1da177e4 | 681 | } |
392c2180 | 682 | return 0; |
1da177e4 LT |
683 | } |
684 | ||
08f73957 AV |
685 | static inline void handle_signal32(struct ksignal *ksig, |
686 | struct pt_regs *regs) | |
1da177e4 | 687 | { |
08f73957 | 688 | sigset_t *oldset = sigmask_to_save(); |
392c2180 DM |
689 | int err; |
690 | ||
08f73957 AV |
691 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
692 | err = setup_rt_frame32(ksig, regs, oldset); | |
ec98c6b9 | 693 | else |
08f73957 | 694 | err = setup_frame32(ksig, regs, oldset); |
392c2180 | 695 | |
08f73957 | 696 | signal_setup_done(err, ksig, 0); |
1da177e4 LT |
697 | } |
698 | ||
699 | static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, | |
700 | struct sigaction *sa) | |
701 | { | |
702 | switch (regs->u_regs[UREG_I0]) { | |
703 | case ERESTART_RESTARTBLOCK: | |
704 | case ERESTARTNOHAND: | |
705 | no_system_call_restart: | |
706 | regs->u_regs[UREG_I0] = EINTR; | |
707 | regs->tstate |= TSTATE_ICARRY; | |
708 | break; | |
709 | case ERESTARTSYS: | |
710 | if (!(sa->sa_flags & SA_RESTART)) | |
711 | goto no_system_call_restart; | |
712 | /* fallthrough */ | |
713 | case ERESTARTNOINTR: | |
714 | regs->u_regs[UREG_I0] = orig_i0; | |
715 | regs->tpc -= 4; | |
716 | regs->tnpc -= 4; | |
717 | } | |
718 | } | |
719 | ||
720 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
721 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
722 | * mistake. | |
723 | */ | |
dfbb83d3 | 724 | void do_signal32(struct pt_regs * regs) |
1da177e4 | 725 | { |
08f73957 AV |
726 | struct ksignal ksig; |
727 | unsigned long orig_i0 = 0; | |
728 | int restart_syscall = 0; | |
729 | bool has_handler = get_signal(&ksig); | |
28e61036 | 730 | |
1d299bc7 DM |
731 | if (pt_regs_is_syscall(regs) && |
732 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { | |
733 | restart_syscall = 1; | |
e88d2468 | 734 | orig_i0 = regs->u_regs[UREG_G6]; |
1d299bc7 | 735 | } |
28e61036 | 736 | |
08f73957 | 737 | if (has_handler) { |
28e61036 | 738 | if (restart_syscall) |
08f73957 AV |
739 | syscall_restart32(orig_i0, regs, &ksig.ka.sa); |
740 | handle_signal32(&ksig, regs); | |
741 | } else { | |
742 | if (restart_syscall) { | |
743 | switch (regs->u_regs[UREG_I0]) { | |
744 | case ERESTARTNOHAND: | |
745 | case ERESTARTSYS: | |
746 | case ERESTARTNOINTR: | |
747 | /* replay the system call when we are done */ | |
748 | regs->u_regs[UREG_I0] = orig_i0; | |
749 | regs->tpc -= 4; | |
750 | regs->tnpc -= 4; | |
751 | pt_regs_clear_syscall(regs); | |
752 | case ERESTART_RESTARTBLOCK: | |
753 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
754 | regs->tpc -= 4; | |
755 | regs->tnpc -= 4; | |
756 | pt_regs_clear_syscall(regs); | |
757 | } | |
758 | } | |
759 | restore_saved_sigmask(); | |
1da177e4 | 760 | } |
1da177e4 LT |
761 | } |
762 | ||
763 | struct sigstack32 { | |
764 | u32 the_stack; | |
765 | int cur_status; | |
766 | }; | |
767 | ||
768 | asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) | |
769 | { | |
770 | struct sigstack32 __user *ssptr = | |
771 | (struct sigstack32 __user *)((unsigned long)(u_ssptr)); | |
772 | struct sigstack32 __user *ossptr = | |
773 | (struct sigstack32 __user *)((unsigned long)(u_ossptr)); | |
774 | int ret = -EFAULT; | |
775 | ||
776 | /* First see if old state is wanted. */ | |
777 | if (ossptr) { | |
778 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
779 | &ossptr->the_stack) || | |
780 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
781 | goto out; | |
782 | } | |
783 | ||
784 | /* Now see if we want to update the new state. */ | |
785 | if (ssptr) { | |
786 | u32 ss_sp; | |
787 | ||
788 | if (get_user(ss_sp, &ssptr->the_stack)) | |
789 | goto out; | |
790 | ||
791 | /* If the current stack was set with sigaltstack, don't | |
792 | * swap stacks while we are on it. | |
793 | */ | |
794 | ret = -EPERM; | |
795 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
796 | goto out; | |
797 | ||
798 | /* Since we don't know the extent of the stack, and we don't | |
799 | * track onstack-ness, but rather calculate it, we must | |
800 | * presume a size. Ho hum this interface is lossy. | |
801 | */ | |
802 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
803 | current->sas_ss_size = SIGSTKSZ; | |
804 | } | |
805 | ||
806 | ret = 0; | |
807 | out: | |
808 | return ret; | |
809 | } |