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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> | |
23 | ||
7c0f6ba6 | 24 | #include <linux/uaccess.h> |
1da177e4 | 25 | #include <asm/ptrace.h> |
1da177e4 LT |
26 | #include <asm/psrcompat.h> |
27 | #include <asm/fpumacro.h> | |
28 | #include <asm/visasm.h> | |
14cc6aba | 29 | #include <asm/compat_signal.h> |
d550bbd4 | 30 | #include <asm/switch_to.h> |
1da177e4 | 31 | |
5598473a | 32 | #include "sigutil.h" |
abaff455 | 33 | #include "kernel.h" |
5598473a | 34 | |
1da177e4 LT |
35 | /* This magic should be in g_upper[0] for all upper parts |
36 | * to be valid. | |
37 | */ | |
38 | #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 | |
39 | typedef struct { | |
40 | unsigned int g_upper[8]; | |
41 | unsigned int o_upper[8]; | |
42 | unsigned int asi; | |
43 | } siginfo_extra_v8plus_t; | |
44 | ||
5526b7e4 | 45 | struct signal_frame32 { |
1da177e4 LT |
46 | struct sparc_stackf32 ss; |
47 | __siginfo32_t info; | |
5598473a | 48 | /* __siginfo_fpu_t * */ u32 fpu_save; |
1da177e4 LT |
49 | unsigned int insns[2]; |
50 | unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; | |
51 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ | |
52 | /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
53 | siginfo_extra_v8plus_t v8plus; | |
5598473a DM |
54 | /* __siginfo_rwin_t * */u32 rwin_save; |
55 | } __attribute__((aligned(8))); | |
1da177e4 | 56 | |
1da177e4 LT |
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; | |
5598473a | 62 | /* __siginfo_fpu_t * */ u32 fpu_save; |
1da177e4 | 63 | unsigned int insns[2]; |
99b06feb | 64 | compat_stack_t stack; |
1da177e4 LT |
65 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ |
66 | /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
67 | siginfo_extra_v8plus_t v8plus; | |
5598473a DM |
68 | /* __siginfo_rwin_t * */u32 rwin_save; |
69 | } __attribute__((aligned(8))); | |
1da177e4 | 70 | |
d11c2a0d DM |
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 | ||
5526b7e4 | 83 | void do_sigreturn32(struct pt_regs *regs) |
1da177e4 | 84 | { |
5526b7e4 | 85 | struct signal_frame32 __user *sf; |
5598473a DM |
86 | compat_uptr_t fpu_save; |
87 | compat_uptr_t rwin_save; | |
d11c2a0d | 88 | unsigned int psr, ufp; |
9ef595d8 | 89 | unsigned int pc, npc; |
1da177e4 | 90 | sigset_t set; |
c19ac326 | 91 | compat_sigset_t seta; |
1da177e4 LT |
92 | int err, i; |
93 | ||
5526b7e4 | 94 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 95 | current->restart_block.fn = do_no_restart_syscall; |
5526b7e4 DM |
96 | |
97 | synchronize_user_stack(); | |
98 | ||
1da177e4 | 99 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
5526b7e4 | 100 | sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; |
1da177e4 LT |
101 | |
102 | /* 1. Make sure we are not getting garbage from the user */ | |
d11c2a0d DM |
103 | if (invalid_frame_pointer(sf, 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) | |
1da177e4 LT |
110 | goto segv; |
111 | ||
d11c2a0d | 112 | if (__get_user(pc, &sf->info.si_regs.pc) || |
187cd44e AV |
113 | __get_user(npc, &sf->info.si_regs.npc)) |
114 | goto segv; | |
1da177e4 LT |
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 | ||
2678fefe | 149 | /* Prevent syscall restart. */ |
28e61036 | 150 | pt_regs_clear_syscall(regs); |
2678fefe | 151 | |
1da177e4 | 152 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
153 | if (!err && fpu_save) |
154 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
155 | err |= __get_user(rwin_save, &sf->rwin_save); | |
156 | if (!err && rwin_save) { | |
157 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
158 | goto segv; | |
159 | } | |
c19ac326 SR |
160 | err |= __get_user(seta.sig[0], &sf->info.si_mask); |
161 | err |= copy_from_user(&seta.sig[1], &sf->extramask, | |
1da177e4 LT |
162 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
163 | if (err) | |
164 | goto segv; | |
c19ac326 SR |
165 | |
166 | set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); | |
faddf598 | 167 | set_current_blocked(&set); |
1da177e4 LT |
168 | return; |
169 | ||
170 | segv: | |
3cf5d076 | 171 | force_sig(SIGSEGV); |
1da177e4 LT |
172 | } |
173 | ||
1da177e4 LT |
174 | asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
175 | { | |
176 | struct rt_signal_frame32 __user *sf; | |
d11c2a0d | 177 | unsigned int psr, pc, npc, ufp; |
5598473a DM |
178 | compat_uptr_t fpu_save; |
179 | compat_uptr_t rwin_save; | |
1da177e4 | 180 | sigset_t set; |
1da177e4 LT |
181 | int err, i; |
182 | ||
183 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 184 | current->restart_block.fn = do_no_restart_syscall; |
1da177e4 LT |
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 */ | |
d11c2a0d | 191 | if (invalid_frame_pointer(sf, sizeof(*sf))) |
1da177e4 LT |
192 | goto segv; |
193 | ||
d11c2a0d DM |
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) || | |
187cd44e AV |
201 | __get_user(npc, &sf->regs.npc)) |
202 | goto segv; | |
1da177e4 LT |
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 | ||
2678fefe | 237 | /* Prevent syscall restart. */ |
28e61036 | 238 | pt_regs_clear_syscall(regs); |
2678fefe | 239 | |
1da177e4 | 240 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
241 | if (!err && fpu_save) |
242 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
68c38fb6 | 243 | err |= get_compat_sigset(&set, &sf->mask); |
99b06feb | 244 | err |= compat_restore_altstack(&sf->stack); |
1da177e4 LT |
245 | if (err) |
246 | goto segv; | |
247 | ||
5598473a DM |
248 | err |= __get_user(rwin_save, &sf->rwin_save); |
249 | if (!err && rwin_save) { | |
250 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
251 | goto segv; | |
252 | } | |
253 | ||
faddf598 | 254 | set_current_blocked(&set); |
1da177e4 LT |
255 | return; |
256 | segv: | |
3cf5d076 | 257 | force_sig(SIGSEGV); |
1da177e4 LT |
258 | } |
259 | ||
08f73957 | 260 | static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) |
1da177e4 LT |
261 | { |
262 | unsigned long sp; | |
263 | ||
264 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
265 | sp = regs->u_regs[UREG_FP]; | |
266 | ||
dc5dc7e6 DM |
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 | ||
1da177e4 | 274 | /* This is the X/Open sanctioned signal stack switching. */ |
08f73957 | 275 | sp = sigsp(sp, ksig) - framesize; |
f036d9f3 | 276 | |
dc5dc7e6 DM |
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 | */ | |
f036d9f3 | 283 | sp &= ~15UL; |
dc5dc7e6 | 284 | |
f036d9f3 | 285 | return (void __user *) sp; |
1da177e4 LT |
286 | } |
287 | ||
05c5e769 DM |
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; | |
5637bc50 | 300 | p4d_t *p4dp; |
05c5e769 DM |
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(*pgdp)) | |
319 | goto out_irqs_on; | |
5637bc50 MR |
320 | p4dp = p4d_offset(pgdp, address); |
321 | if (p4d_none(*p4dp)) | |
322 | goto out_irqs_on; | |
323 | pudp = pud_offset(p4dp, address); | |
05c5e769 DM |
324 | if (pud_none(*pudp)) |
325 | goto out_irqs_on; | |
326 | pmdp = pmd_offset(pudp, address); | |
327 | if (pmd_none(*pmdp)) | |
328 | goto out_irqs_on; | |
329 | ||
330 | ptep = pte_offset_map(pmdp, address); | |
4be14ec0 HD |
331 | if (!ptep) |
332 | goto out_irqs_on; | |
05c5e769 DM |
333 | pte = *ptep; |
334 | if (!pte_present(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(ptep); | |
347 | out_irqs_on: | |
348 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); | |
349 | ||
350 | } | |
351 | ||
08f73957 AV |
352 | static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, |
353 | sigset_t *oldset) | |
1da177e4 | 354 | { |
5526b7e4 | 355 | struct signal_frame32 __user *sf; |
5598473a DM |
356 | int i, err, wsaved; |
357 | void __user *tail; | |
1da177e4 LT |
358 | int sigframe_size; |
359 | u32 psr; | |
c19ac326 | 360 | compat_sigset_t seta; |
1da177e4 LT |
361 | |
362 | /* 1. Make sure everything is clean */ | |
363 | synchronize_user_stack(); | |
364 | save_and_clear_fpu(); | |
365 | ||
5598473a DM |
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); | |
1da177e4 | 373 | |
5526b7e4 | 374 | sf = (struct signal_frame32 __user *) |
08f73957 | 375 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 376 | |
08f73957 | 377 | if (invalid_frame_pointer(sf, sigframe_size)) { |
5b4fc388 DM |
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]); | |
cb44c9a0 | 382 | force_sigsegv(ksig->sig); |
08f73957 AV |
383 | return -EINVAL; |
384 | } | |
1da177e4 | 385 | |
5598473a | 386 | tail = (sf + 1); |
1da177e4 LT |
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) { | |
5598473a DM |
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); | |
1da177e4 LT |
415 | } else { |
416 | err |= __put_user(0, &sf->fpu_save); | |
417 | } | |
5598473a DM |
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 | } | |
1da177e4 | 427 | |
c19ac326 SR |
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(sf->extramask, &seta.sig[1], | |
1da177e4 LT |
436 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
437 | ||
5598473a | 438 | if (!wsaved) { |
a7a08b27 AB |
439 | err |= raw_copy_in_user((u32 __user *)sf, |
440 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
441 | sizeof(struct reg_window32)); | |
5598473a DM |
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 | } | |
1da177e4 | 453 | if (err) |
08f73957 | 454 | return err; |
1da177e4 LT |
455 | |
456 | /* 3. signal handler back-trampoline and parameters */ | |
457 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 458 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
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 */ | |
08f73957 | 463 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
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 */ | |
08f73957 AV |
471 | if (ksig->ka.ka_restorer) { |
472 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 | 473 | } else { |
1da177e4 | 474 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
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) | |
08f73957 | 481 | return err; |
05c5e769 | 482 | flush_signal_insns(address); |
1da177e4 | 483 | } |
c2785259 | 484 | return 0; |
1da177e4 LT |
485 | } |
486 | ||
08f73957 AV |
487 | static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, |
488 | sigset_t *oldset) | |
1da177e4 LT |
489 | { |
490 | struct rt_signal_frame32 __user *sf; | |
5598473a DM |
491 | int i, err, wsaved; |
492 | void __user *tail; | |
1da177e4 LT |
493 | int sigframe_size; |
494 | u32 psr; | |
1da177e4 LT |
495 | |
496 | /* 1. Make sure everything is clean */ | |
497 | synchronize_user_stack(); | |
498 | save_and_clear_fpu(); | |
499 | ||
5598473a DM |
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); | |
1da177e4 LT |
507 | |
508 | sf = (struct rt_signal_frame32 __user *) | |
08f73957 | 509 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 510 | |
08f73957 | 511 | if (invalid_frame_pointer(sf, sigframe_size)) { |
5b4fc388 DM |
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]); | |
cb44c9a0 | 516 | force_sigsegv(ksig->sig); |
08f73957 AV |
517 | return -EINVAL; |
518 | } | |
1da177e4 | 519 | |
5598473a | 520 | tail = (sf + 1); |
1da177e4 LT |
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) { | |
5598473a DM |
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); | |
1da177e4 LT |
549 | } else { |
550 | err |= __put_user(0, &sf->fpu_save); | |
551 | } | |
5598473a DM |
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 | } | |
1da177e4 LT |
561 | |
562 | /* Update the siginfo structure. */ | |
08f73957 | 563 | err |= copy_siginfo_to_user32(&sf->info, &ksig->info); |
1da177e4 LT |
564 | |
565 | /* Setup sigaltstack */ | |
99b06feb | 566 | err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); |
1da177e4 | 567 | |
68c38fb6 | 568 | err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t)); |
1da177e4 | 569 | |
5598473a | 570 | if (!wsaved) { |
a7a08b27 AB |
571 | err |= raw_copy_in_user((u32 __user *)sf, |
572 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
573 | sizeof(struct reg_window32)); | |
5598473a DM |
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 | } | |
1da177e4 | 585 | if (err) |
08f73957 | 586 | return err; |
1da177e4 LT |
587 | |
588 | /* 3. signal handler back-trampoline and parameters */ | |
589 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 590 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
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 */ | |
08f73957 | 595 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
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 */ | |
08f73957 AV |
603 | if (ksig->ka.ka_restorer) |
604 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 | 605 | else { |
1da177e4 | 606 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
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) | |
08f73957 | 616 | return err; |
1da177e4 | 617 | |
05c5e769 | 618 | flush_signal_insns(address); |
1da177e4 | 619 | } |
392c2180 | 620 | return 0; |
1da177e4 LT |
621 | } |
622 | ||
08f73957 AV |
623 | static inline void handle_signal32(struct ksignal *ksig, |
624 | struct pt_regs *regs) | |
1da177e4 | 625 | { |
08f73957 | 626 | sigset_t *oldset = sigmask_to_save(); |
392c2180 DM |
627 | int err; |
628 | ||
08f73957 AV |
629 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
630 | err = setup_rt_frame32(ksig, regs, oldset); | |
ec98c6b9 | 631 | else |
08f73957 | 632 | err = setup_frame32(ksig, regs, oldset); |
392c2180 | 633 | |
08f73957 | 634 | signal_setup_done(err, ksig, 0); |
1da177e4 LT |
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; | |
df561f66 | 650 | fallthrough; |
1da177e4 LT |
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 | */ | |
dfbb83d3 | 662 | void do_signal32(struct pt_regs * regs) |
1da177e4 | 663 | { |
08f73957 AV |
664 | struct ksignal ksig; |
665 | unsigned long orig_i0 = 0; | |
666 | int restart_syscall = 0; | |
667 | bool has_handler = get_signal(&ksig); | |
28e61036 | 668 | |
1d299bc7 DM |
669 | if (pt_regs_is_syscall(regs) && |
670 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { | |
671 | restart_syscall = 1; | |
e88d2468 | 672 | orig_i0 = regs->u_regs[UREG_G6]; |
1d299bc7 | 673 | } |
28e61036 | 674 | |
08f73957 | 675 | if (has_handler) { |
28e61036 | 676 | if (restart_syscall) |
08f73957 AV |
677 | syscall_restart32(orig_i0, regs, &ksig.ka.sa); |
678 | handle_signal32(&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); | |
df561f66 | 690 | fallthrough; |
08f73957 AV |
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(); | |
1da177e4 | 699 | } |
1da177e4 LT |
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 | } | |
42365abd ME |
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); | |
a5f6c2ac | 756 | static_assert(NSIGSEGV == 10); |
42365abd ME |
757 | static_assert(NSIGBUS == 5); |
758 | static_assert(NSIGTRAP == 6); | |
759 | static_assert(NSIGCHLD == 6); | |
760 | static_assert(NSIGSYS == 2); | |
50ae8130 EB |
761 | static_assert(sizeof(compat_siginfo_t) == 128); |
762 | static_assert(__alignof__(compat_siginfo_t) == 4); | |
42365abd ME |
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); | |
78ed93d7 | 784 | static_assert(offsetof(compat_siginfo_t, si_perf_flags) == 0x18); |
42365abd ME |
785 | static_assert(offsetof(compat_siginfo_t, si_band) == 0x0c); |
786 | static_assert(offsetof(compat_siginfo_t, si_fd) == 0x10); |