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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 | |
d11c2a0d DM |
73 | /* Checks if the fp is valid. We always build signal frames which are |
74 | * 16-byte aligned, therefore we can always enforce that the restore | |
75 | * frame has that property as well. | |
76 | */ | |
77 | static bool invalid_frame_pointer(void __user *fp, int fplen) | |
78 | { | |
79 | if ((((unsigned long) fp) & 15) || | |
80 | ((unsigned long)fp) > 0x100000000ULL - fplen) | |
81 | return true; | |
82 | return false; | |
83 | } | |
84 | ||
5526b7e4 | 85 | void do_sigreturn32(struct pt_regs *regs) |
1da177e4 | 86 | { |
5526b7e4 | 87 | struct signal_frame32 __user *sf; |
5598473a DM |
88 | compat_uptr_t fpu_save; |
89 | compat_uptr_t rwin_save; | |
d11c2a0d | 90 | unsigned int psr, ufp; |
9ef595d8 | 91 | unsigned int pc, npc; |
1da177e4 | 92 | sigset_t set; |
c19ac326 | 93 | compat_sigset_t seta; |
1da177e4 LT |
94 | int err, i; |
95 | ||
5526b7e4 | 96 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 97 | current->restart_block.fn = do_no_restart_syscall; |
5526b7e4 DM |
98 | |
99 | synchronize_user_stack(); | |
100 | ||
1da177e4 | 101 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
5526b7e4 | 102 | sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; |
1da177e4 LT |
103 | |
104 | /* 1. Make sure we are not getting garbage from the user */ | |
d11c2a0d DM |
105 | if (invalid_frame_pointer(sf, sizeof(*sf))) |
106 | goto segv; | |
107 | ||
108 | if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP])) | |
109 | goto segv; | |
110 | ||
111 | if (ufp & 0x7) | |
1da177e4 LT |
112 | goto segv; |
113 | ||
d11c2a0d | 114 | if (__get_user(pc, &sf->info.si_regs.pc) || |
187cd44e AV |
115 | __get_user(npc, &sf->info.si_regs.npc)) |
116 | goto segv; | |
1da177e4 LT |
117 | |
118 | if ((pc | npc) & 3) | |
119 | goto segv; | |
120 | ||
121 | if (test_thread_flag(TIF_32BIT)) { | |
122 | pc &= 0xffffffff; | |
123 | npc &= 0xffffffff; | |
124 | } | |
125 | regs->tpc = pc; | |
126 | regs->tnpc = npc; | |
127 | ||
128 | /* 2. Restore the state */ | |
129 | err = __get_user(regs->y, &sf->info.si_regs.y); | |
130 | err |= __get_user(psr, &sf->info.si_regs.psr); | |
131 | ||
132 | for (i = UREG_G1; i <= UREG_I7; i++) | |
133 | err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
134 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
135 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
136 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
137 | unsigned long asi; | |
138 | ||
139 | for (i = UREG_G1; i <= UREG_I7; i++) | |
140 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
141 | err |= __get_user(asi, &sf->v8plus.asi); | |
142 | regs->tstate &= ~TSTATE_ASI; | |
143 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
144 | } | |
145 | } | |
146 | ||
147 | /* User can only change condition codes in %tstate. */ | |
148 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
149 | regs->tstate |= psr_to_tstate_icc(psr); | |
150 | ||
2678fefe | 151 | /* Prevent syscall restart. */ |
28e61036 | 152 | pt_regs_clear_syscall(regs); |
2678fefe | 153 | |
1da177e4 | 154 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
155 | if (!err && fpu_save) |
156 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
157 | err |= __get_user(rwin_save, &sf->rwin_save); | |
158 | if (!err && rwin_save) { | |
159 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
160 | goto segv; | |
161 | } | |
c19ac326 SR |
162 | err |= __get_user(seta.sig[0], &sf->info.si_mask); |
163 | err |= copy_from_user(&seta.sig[1], &sf->extramask, | |
1da177e4 LT |
164 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
165 | if (err) | |
166 | goto segv; | |
c19ac326 SR |
167 | |
168 | set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); | |
faddf598 | 169 | set_current_blocked(&set); |
1da177e4 LT |
170 | return; |
171 | ||
172 | segv: | |
173 | force_sig(SIGSEGV, current); | |
174 | } | |
175 | ||
1da177e4 LT |
176 | asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
177 | { | |
178 | struct rt_signal_frame32 __user *sf; | |
d11c2a0d | 179 | unsigned int psr, pc, npc, ufp; |
5598473a DM |
180 | compat_uptr_t fpu_save; |
181 | compat_uptr_t rwin_save; | |
1da177e4 | 182 | sigset_t set; |
1da177e4 LT |
183 | int err, i; |
184 | ||
185 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 186 | current->restart_block.fn = do_no_restart_syscall; |
1da177e4 LT |
187 | |
188 | synchronize_user_stack(); | |
189 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
190 | sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; | |
191 | ||
192 | /* 1. Make sure we are not getting garbage from the user */ | |
d11c2a0d | 193 | if (invalid_frame_pointer(sf, sizeof(*sf))) |
1da177e4 LT |
194 | goto segv; |
195 | ||
d11c2a0d DM |
196 | if (get_user(ufp, &sf->regs.u_regs[UREG_FP])) |
197 | goto segv; | |
198 | ||
199 | if (ufp & 0x7) | |
200 | goto segv; | |
201 | ||
202 | if (__get_user(pc, &sf->regs.pc) || | |
187cd44e AV |
203 | __get_user(npc, &sf->regs.npc)) |
204 | goto segv; | |
1da177e4 LT |
205 | |
206 | if ((pc | npc) & 3) | |
207 | goto segv; | |
208 | ||
209 | if (test_thread_flag(TIF_32BIT)) { | |
210 | pc &= 0xffffffff; | |
211 | npc &= 0xffffffff; | |
212 | } | |
213 | regs->tpc = pc; | |
214 | regs->tnpc = npc; | |
215 | ||
216 | /* 2. Restore the state */ | |
217 | err = __get_user(regs->y, &sf->regs.y); | |
218 | err |= __get_user(psr, &sf->regs.psr); | |
219 | ||
220 | for (i = UREG_G1; i <= UREG_I7; i++) | |
221 | err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
222 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
223 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
224 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
225 | unsigned long asi; | |
226 | ||
227 | for (i = UREG_G1; i <= UREG_I7; i++) | |
228 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
229 | err |= __get_user(asi, &sf->v8plus.asi); | |
230 | regs->tstate &= ~TSTATE_ASI; | |
231 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
232 | } | |
233 | } | |
234 | ||
235 | /* User can only change condition codes in %tstate. */ | |
236 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
237 | regs->tstate |= psr_to_tstate_icc(psr); | |
238 | ||
2678fefe | 239 | /* Prevent syscall restart. */ |
28e61036 | 240 | pt_regs_clear_syscall(regs); |
2678fefe | 241 | |
1da177e4 | 242 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
243 | if (!err && fpu_save) |
244 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
68c38fb6 | 245 | err |= get_compat_sigset(&set, &sf->mask); |
99b06feb | 246 | err |= compat_restore_altstack(&sf->stack); |
1da177e4 LT |
247 | if (err) |
248 | goto segv; | |
249 | ||
5598473a DM |
250 | err |= __get_user(rwin_save, &sf->rwin_save); |
251 | if (!err && rwin_save) { | |
252 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
253 | goto segv; | |
254 | } | |
255 | ||
faddf598 | 256 | set_current_blocked(&set); |
1da177e4 LT |
257 | return; |
258 | segv: | |
259 | force_sig(SIGSEGV, current); | |
260 | } | |
261 | ||
08f73957 | 262 | static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) |
1da177e4 LT |
263 | { |
264 | unsigned long sp; | |
265 | ||
266 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
267 | sp = regs->u_regs[UREG_FP]; | |
268 | ||
dc5dc7e6 DM |
269 | /* |
270 | * If we are on the alternate signal stack and would overflow it, don't. | |
271 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
272 | */ | |
273 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) | |
274 | return (void __user *) -1L; | |
275 | ||
1da177e4 | 276 | /* This is the X/Open sanctioned signal stack switching. */ |
08f73957 | 277 | sp = sigsp(sp, ksig) - framesize; |
f036d9f3 | 278 | |
dc5dc7e6 DM |
279 | /* Always align the stack frame. This handles two cases. First, |
280 | * sigaltstack need not be mindful of platform specific stack | |
281 | * alignment. Second, if we took this signal because the stack | |
282 | * is not aligned properly, we'd like to take the signal cleanly | |
283 | * and report that. | |
284 | */ | |
f036d9f3 | 285 | sp &= ~15UL; |
dc5dc7e6 | 286 | |
f036d9f3 | 287 | return (void __user *) sp; |
1da177e4 LT |
288 | } |
289 | ||
05c5e769 DM |
290 | /* The I-cache flush instruction only works in the primary ASI, which |
291 | * right now is the nucleus, aka. kernel space. | |
292 | * | |
293 | * Therefore we have to kick the instructions out using the kernel | |
294 | * side linear mapping of the physical address backing the user | |
295 | * instructions. | |
296 | */ | |
297 | static void flush_signal_insns(unsigned long address) | |
298 | { | |
299 | unsigned long pstate, paddr; | |
300 | pte_t *ptep, pte; | |
301 | pgd_t *pgdp; | |
302 | pud_t *pudp; | |
303 | pmd_t *pmdp; | |
304 | ||
305 | /* Commit all stores of the instructions we are about to flush. */ | |
306 | wmb(); | |
307 | ||
308 | /* Disable cross-call reception. In this way even a very wide | |
309 | * munmap() on another cpu can't tear down the page table | |
310 | * hierarchy from underneath us, since that can't complete | |
311 | * until the IPI tlb flush returns. | |
312 | */ | |
313 | ||
314 | __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); | |
315 | __asm__ __volatile__("wrpr %0, %1, %%pstate" | |
316 | : : "r" (pstate), "i" (PSTATE_IE)); | |
317 | ||
318 | pgdp = pgd_offset(current->mm, address); | |
319 | if (pgd_none(*pgdp)) | |
320 | goto out_irqs_on; | |
321 | pudp = pud_offset(pgdp, address); | |
322 | if (pud_none(*pudp)) | |
323 | goto out_irqs_on; | |
324 | pmdp = pmd_offset(pudp, address); | |
325 | if (pmd_none(*pmdp)) | |
326 | goto out_irqs_on; | |
327 | ||
328 | ptep = pte_offset_map(pmdp, address); | |
329 | pte = *ptep; | |
330 | if (!pte_present(pte)) | |
331 | goto out_unmap; | |
332 | ||
333 | paddr = (unsigned long) page_address(pte_page(pte)); | |
334 | ||
335 | __asm__ __volatile__("flush %0 + %1" | |
336 | : /* no outputs */ | |
337 | : "r" (paddr), | |
338 | "r" (address & (PAGE_SIZE - 1)) | |
339 | : "memory"); | |
340 | ||
341 | out_unmap: | |
342 | pte_unmap(ptep); | |
343 | out_irqs_on: | |
344 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); | |
345 | ||
346 | } | |
347 | ||
08f73957 AV |
348 | static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, |
349 | sigset_t *oldset) | |
1da177e4 | 350 | { |
5526b7e4 | 351 | struct signal_frame32 __user *sf; |
5598473a DM |
352 | int i, err, wsaved; |
353 | void __user *tail; | |
1da177e4 LT |
354 | int sigframe_size; |
355 | u32 psr; | |
c19ac326 | 356 | compat_sigset_t seta; |
1da177e4 LT |
357 | |
358 | /* 1. Make sure everything is clean */ | |
359 | synchronize_user_stack(); | |
360 | save_and_clear_fpu(); | |
361 | ||
5598473a DM |
362 | wsaved = get_thread_wsaved(); |
363 | ||
364 | sigframe_size = sizeof(*sf); | |
365 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
366 | sigframe_size += sizeof(__siginfo_fpu_t); | |
367 | if (wsaved) | |
368 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 | 369 | |
5526b7e4 | 370 | sf = (struct signal_frame32 __user *) |
08f73957 | 371 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 372 | |
08f73957 AV |
373 | if (invalid_frame_pointer(sf, sigframe_size)) { |
374 | do_exit(SIGILL); | |
375 | return -EINVAL; | |
376 | } | |
1da177e4 | 377 | |
5598473a | 378 | tail = (sf + 1); |
1da177e4 LT |
379 | |
380 | /* 2. Save the current process state */ | |
381 | if (test_thread_flag(TIF_32BIT)) { | |
382 | regs->tpc &= 0xffffffff; | |
383 | regs->tnpc &= 0xffffffff; | |
384 | } | |
385 | err = put_user(regs->tpc, &sf->info.si_regs.pc); | |
386 | err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); | |
387 | err |= __put_user(regs->y, &sf->info.si_regs.y); | |
388 | psr = tstate_to_psr(regs->tstate); | |
389 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
390 | psr |= PSR_EF; | |
391 | err |= __put_user(psr, &sf->info.si_regs.psr); | |
392 | for (i = 0; i < 16; i++) | |
393 | err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
394 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
395 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
396 | for (i = 1; i < 16; i++) | |
397 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
398 | &sf->v8plus.g_upper[i]); | |
399 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
400 | &sf->v8plus.asi); | |
401 | ||
402 | if (psr & PSR_EF) { | |
5598473a DM |
403 | __siginfo_fpu_t __user *fp = tail; |
404 | tail += sizeof(*fp); | |
405 | err |= save_fpu_state(regs, fp); | |
406 | err |= __put_user((u64)fp, &sf->fpu_save); | |
1da177e4 LT |
407 | } else { |
408 | err |= __put_user(0, &sf->fpu_save); | |
409 | } | |
5598473a DM |
410 | if (wsaved) { |
411 | __siginfo_rwin_t __user *rwp = tail; | |
412 | tail += sizeof(*rwp); | |
413 | err |= save_rwin_state(wsaved, rwp); | |
414 | err |= __put_user((u64)rwp, &sf->rwin_save); | |
415 | set_thread_wsaved(0); | |
416 | } else { | |
417 | err |= __put_user(0, &sf->rwin_save); | |
418 | } | |
1da177e4 | 419 | |
c19ac326 SR |
420 | /* If these change we need to know - assignments to seta relies on these sizes */ |
421 | BUILD_BUG_ON(_NSIG_WORDS != 1); | |
422 | BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2); | |
423 | seta.sig[1] = (oldset->sig[0] >> 32); | |
424 | seta.sig[0] = oldset->sig[0]; | |
425 | ||
426 | err |= __put_user(seta.sig[0], &sf->info.si_mask); | |
427 | err |= __copy_to_user(sf->extramask, &seta.sig[1], | |
1da177e4 LT |
428 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
429 | ||
5598473a DM |
430 | if (!wsaved) { |
431 | err |= copy_in_user((u32 __user *)sf, | |
432 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
433 | sizeof(struct reg_window32)); | |
434 | } else { | |
435 | struct reg_window *rp; | |
436 | ||
437 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
438 | for (i = 0; i < 8; i++) | |
439 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); | |
440 | for (i = 0; i < 6; i++) | |
441 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); | |
442 | err |= __put_user(rp->ins[6], &sf->ss.fp); | |
443 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); | |
444 | } | |
1da177e4 | 445 | if (err) |
08f73957 | 446 | return err; |
1da177e4 LT |
447 | |
448 | /* 3. signal handler back-trampoline and parameters */ | |
449 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 450 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
451 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
452 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
453 | ||
454 | /* 4. signal handler */ | |
08f73957 | 455 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
456 | regs->tnpc = (regs->tpc + 4); |
457 | if (test_thread_flag(TIF_32BIT)) { | |
458 | regs->tpc &= 0xffffffff; | |
459 | regs->tnpc &= 0xffffffff; | |
460 | } | |
461 | ||
462 | /* 5. return to kernel instructions */ | |
08f73957 AV |
463 | if (ksig->ka.ka_restorer) { |
464 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 | 465 | } else { |
1da177e4 | 466 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
467 | |
468 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
469 | ||
470 | err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ | |
471 | err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ | |
472 | if (err) | |
08f73957 | 473 | return err; |
05c5e769 | 474 | flush_signal_insns(address); |
1da177e4 | 475 | } |
c2785259 | 476 | return 0; |
1da177e4 LT |
477 | } |
478 | ||
08f73957 AV |
479 | static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, |
480 | sigset_t *oldset) | |
1da177e4 LT |
481 | { |
482 | struct rt_signal_frame32 __user *sf; | |
5598473a DM |
483 | int i, err, wsaved; |
484 | void __user *tail; | |
1da177e4 LT |
485 | int sigframe_size; |
486 | u32 psr; | |
1da177e4 LT |
487 | |
488 | /* 1. Make sure everything is clean */ | |
489 | synchronize_user_stack(); | |
490 | save_and_clear_fpu(); | |
491 | ||
5598473a DM |
492 | wsaved = get_thread_wsaved(); |
493 | ||
494 | sigframe_size = sizeof(*sf); | |
495 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
496 | sigframe_size += sizeof(__siginfo_fpu_t); | |
497 | if (wsaved) | |
498 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 LT |
499 | |
500 | sf = (struct rt_signal_frame32 __user *) | |
08f73957 | 501 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 502 | |
08f73957 AV |
503 | if (invalid_frame_pointer(sf, sigframe_size)) { |
504 | do_exit(SIGILL); | |
505 | return -EINVAL; | |
506 | } | |
1da177e4 | 507 | |
5598473a | 508 | tail = (sf + 1); |
1da177e4 LT |
509 | |
510 | /* 2. Save the current process state */ | |
511 | if (test_thread_flag(TIF_32BIT)) { | |
512 | regs->tpc &= 0xffffffff; | |
513 | regs->tnpc &= 0xffffffff; | |
514 | } | |
515 | err = put_user(regs->tpc, &sf->regs.pc); | |
516 | err |= __put_user(regs->tnpc, &sf->regs.npc); | |
517 | err |= __put_user(regs->y, &sf->regs.y); | |
518 | psr = tstate_to_psr(regs->tstate); | |
519 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
520 | psr |= PSR_EF; | |
521 | err |= __put_user(psr, &sf->regs.psr); | |
522 | for (i = 0; i < 16; i++) | |
523 | err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
524 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
525 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
526 | for (i = 1; i < 16; i++) | |
527 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
528 | &sf->v8plus.g_upper[i]); | |
529 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
530 | &sf->v8plus.asi); | |
531 | ||
532 | if (psr & PSR_EF) { | |
5598473a DM |
533 | __siginfo_fpu_t __user *fp = tail; |
534 | tail += sizeof(*fp); | |
535 | err |= save_fpu_state(regs, fp); | |
536 | err |= __put_user((u64)fp, &sf->fpu_save); | |
1da177e4 LT |
537 | } else { |
538 | err |= __put_user(0, &sf->fpu_save); | |
539 | } | |
5598473a DM |
540 | if (wsaved) { |
541 | __siginfo_rwin_t __user *rwp = tail; | |
542 | tail += sizeof(*rwp); | |
543 | err |= save_rwin_state(wsaved, rwp); | |
544 | err |= __put_user((u64)rwp, &sf->rwin_save); | |
545 | set_thread_wsaved(0); | |
546 | } else { | |
547 | err |= __put_user(0, &sf->rwin_save); | |
548 | } | |
1da177e4 LT |
549 | |
550 | /* Update the siginfo structure. */ | |
08f73957 | 551 | err |= copy_siginfo_to_user32(&sf->info, &ksig->info); |
1da177e4 LT |
552 | |
553 | /* Setup sigaltstack */ | |
99b06feb | 554 | err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); |
1da177e4 | 555 | |
68c38fb6 | 556 | err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t)); |
1da177e4 | 557 | |
5598473a DM |
558 | if (!wsaved) { |
559 | err |= copy_in_user((u32 __user *)sf, | |
560 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
561 | sizeof(struct reg_window32)); | |
562 | } else { | |
563 | struct reg_window *rp; | |
564 | ||
565 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
566 | for (i = 0; i < 8; i++) | |
567 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); | |
568 | for (i = 0; i < 6; i++) | |
569 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); | |
570 | err |= __put_user(rp->ins[6], &sf->ss.fp); | |
571 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); | |
572 | } | |
1da177e4 | 573 | if (err) |
08f73957 | 574 | return err; |
1da177e4 LT |
575 | |
576 | /* 3. signal handler back-trampoline and parameters */ | |
577 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 578 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
579 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
580 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
581 | ||
582 | /* 4. signal handler */ | |
08f73957 | 583 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
584 | regs->tnpc = (regs->tpc + 4); |
585 | if (test_thread_flag(TIF_32BIT)) { | |
586 | regs->tpc &= 0xffffffff; | |
587 | regs->tnpc &= 0xffffffff; | |
588 | } | |
589 | ||
590 | /* 5. return to kernel instructions */ | |
08f73957 AV |
591 | if (ksig->ka.ka_restorer) |
592 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 | 593 | else { |
1da177e4 | 594 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
595 | |
596 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
597 | ||
598 | /* mov __NR_rt_sigreturn, %g1 */ | |
599 | err |= __put_user(0x82102065, &sf->insns[0]); | |
600 | ||
601 | /* t 0x10 */ | |
602 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
603 | if (err) | |
08f73957 | 604 | return err; |
1da177e4 | 605 | |
05c5e769 | 606 | flush_signal_insns(address); |
1da177e4 | 607 | } |
392c2180 | 608 | return 0; |
1da177e4 LT |
609 | } |
610 | ||
08f73957 AV |
611 | static inline void handle_signal32(struct ksignal *ksig, |
612 | struct pt_regs *regs) | |
1da177e4 | 613 | { |
08f73957 | 614 | sigset_t *oldset = sigmask_to_save(); |
392c2180 DM |
615 | int err; |
616 | ||
08f73957 AV |
617 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
618 | err = setup_rt_frame32(ksig, regs, oldset); | |
ec98c6b9 | 619 | else |
08f73957 | 620 | err = setup_frame32(ksig, regs, oldset); |
392c2180 | 621 | |
08f73957 | 622 | signal_setup_done(err, ksig, 0); |
1da177e4 LT |
623 | } |
624 | ||
625 | static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, | |
626 | struct sigaction *sa) | |
627 | { | |
628 | switch (regs->u_regs[UREG_I0]) { | |
629 | case ERESTART_RESTARTBLOCK: | |
630 | case ERESTARTNOHAND: | |
631 | no_system_call_restart: | |
632 | regs->u_regs[UREG_I0] = EINTR; | |
633 | regs->tstate |= TSTATE_ICARRY; | |
634 | break; | |
635 | case ERESTARTSYS: | |
636 | if (!(sa->sa_flags & SA_RESTART)) | |
637 | goto no_system_call_restart; | |
638 | /* fallthrough */ | |
639 | case ERESTARTNOINTR: | |
640 | regs->u_regs[UREG_I0] = orig_i0; | |
641 | regs->tpc -= 4; | |
642 | regs->tnpc -= 4; | |
643 | } | |
644 | } | |
645 | ||
646 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
647 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
648 | * mistake. | |
649 | */ | |
dfbb83d3 | 650 | void do_signal32(struct pt_regs * regs) |
1da177e4 | 651 | { |
08f73957 AV |
652 | struct ksignal ksig; |
653 | unsigned long orig_i0 = 0; | |
654 | int restart_syscall = 0; | |
655 | bool has_handler = get_signal(&ksig); | |
28e61036 | 656 | |
1d299bc7 DM |
657 | if (pt_regs_is_syscall(regs) && |
658 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { | |
659 | restart_syscall = 1; | |
e88d2468 | 660 | orig_i0 = regs->u_regs[UREG_G6]; |
1d299bc7 | 661 | } |
28e61036 | 662 | |
08f73957 | 663 | if (has_handler) { |
28e61036 | 664 | if (restart_syscall) |
08f73957 AV |
665 | syscall_restart32(orig_i0, regs, &ksig.ka.sa); |
666 | handle_signal32(&ksig, regs); | |
667 | } else { | |
668 | if (restart_syscall) { | |
669 | switch (regs->u_regs[UREG_I0]) { | |
670 | case ERESTARTNOHAND: | |
671 | case ERESTARTSYS: | |
672 | case ERESTARTNOINTR: | |
673 | /* replay the system call when we are done */ | |
674 | regs->u_regs[UREG_I0] = orig_i0; | |
675 | regs->tpc -= 4; | |
676 | regs->tnpc -= 4; | |
677 | pt_regs_clear_syscall(regs); | |
678 | case ERESTART_RESTARTBLOCK: | |
679 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
680 | regs->tpc -= 4; | |
681 | regs->tnpc -= 4; | |
682 | pt_regs_clear_syscall(regs); | |
683 | } | |
684 | } | |
685 | restore_saved_sigmask(); | |
1da177e4 | 686 | } |
1da177e4 LT |
687 | } |
688 | ||
689 | struct sigstack32 { | |
690 | u32 the_stack; | |
691 | int cur_status; | |
692 | }; | |
693 | ||
694 | asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) | |
695 | { | |
696 | struct sigstack32 __user *ssptr = | |
697 | (struct sigstack32 __user *)((unsigned long)(u_ssptr)); | |
698 | struct sigstack32 __user *ossptr = | |
699 | (struct sigstack32 __user *)((unsigned long)(u_ossptr)); | |
700 | int ret = -EFAULT; | |
701 | ||
702 | /* First see if old state is wanted. */ | |
703 | if (ossptr) { | |
704 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
705 | &ossptr->the_stack) || | |
706 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
707 | goto out; | |
708 | } | |
709 | ||
710 | /* Now see if we want to update the new state. */ | |
711 | if (ssptr) { | |
712 | u32 ss_sp; | |
713 | ||
714 | if (get_user(ss_sp, &ssptr->the_stack)) | |
715 | goto out; | |
716 | ||
717 | /* If the current stack was set with sigaltstack, don't | |
718 | * swap stacks while we are on it. | |
719 | */ | |
720 | ret = -EPERM; | |
721 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
722 | goto out; | |
723 | ||
724 | /* Since we don't know the extent of the stack, and we don't | |
725 | * track onstack-ness, but rather calculate it, we must | |
726 | * presume a size. Ho hum this interface is lossy. | |
727 | */ | |
728 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
729 | current->sas_ss_size = SIGSTKSZ; | |
730 | } | |
731 | ||
732 | ret = 0; | |
733 | out: | |
734 | return ret; | |
735 | } |