Commit | Line | Data |
---|---|---|
5526b7e4 | 1 | /* arch/sparc64/kernel/signal32.c |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1991, 1992 Linus Torvalds | |
4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) | |
6 | * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) | |
7 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/signal.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/ptrace.h> | |
16 | #include <linux/unistd.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/tty.h> | |
1da177e4 LT |
19 | #include <linux/binfmts.h> |
20 | #include <linux/compat.h> | |
21 | #include <linux/bitops.h> | |
95698466 | 22 | #include <linux/tracehook.h> |
1da177e4 LT |
23 | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/ptrace.h> | |
1da177e4 LT |
26 | #include <asm/pgtable.h> |
27 | #include <asm/psrcompat.h> | |
28 | #include <asm/fpumacro.h> | |
29 | #include <asm/visasm.h> | |
14cc6aba | 30 | #include <asm/compat_signal.h> |
d550bbd4 | 31 | #include <asm/switch_to.h> |
1da177e4 | 32 | |
5598473a | 33 | #include "sigutil.h" |
abaff455 | 34 | #include "kernel.h" |
5598473a | 35 | |
1da177e4 LT |
36 | /* This magic should be in g_upper[0] for all upper parts |
37 | * to be valid. | |
38 | */ | |
39 | #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 | |
40 | typedef struct { | |
41 | unsigned int g_upper[8]; | |
42 | unsigned int o_upper[8]; | |
43 | unsigned int asi; | |
44 | } siginfo_extra_v8plus_t; | |
45 | ||
5526b7e4 | 46 | struct signal_frame32 { |
1da177e4 LT |
47 | struct sparc_stackf32 ss; |
48 | __siginfo32_t info; | |
5598473a | 49 | /* __siginfo_fpu_t * */ u32 fpu_save; |
1da177e4 LT |
50 | unsigned int insns[2]; |
51 | unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; | |
52 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ | |
53 | /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
54 | siginfo_extra_v8plus_t v8plus; | |
5598473a DM |
55 | /* __siginfo_rwin_t * */u32 rwin_save; |
56 | } __attribute__((aligned(8))); | |
1da177e4 | 57 | |
1da177e4 LT |
58 | struct rt_signal_frame32 { |
59 | struct sparc_stackf32 ss; | |
60 | compat_siginfo_t info; | |
61 | struct pt_regs32 regs; | |
62 | compat_sigset_t mask; | |
5598473a | 63 | /* __siginfo_fpu_t * */ u32 fpu_save; |
1da177e4 | 64 | unsigned int insns[2]; |
99b06feb | 65 | compat_stack_t stack; |
1da177e4 LT |
66 | unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ |
67 | /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ | |
68 | siginfo_extra_v8plus_t v8plus; | |
5598473a DM |
69 | /* __siginfo_rwin_t * */u32 rwin_save; |
70 | } __attribute__((aligned(8))); | |
1da177e4 | 71 | |
ce395960 | 72 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) |
1da177e4 LT |
73 | { |
74 | int err; | |
75 | ||
76 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
77 | return -EFAULT; | |
78 | ||
79 | /* If you change siginfo_t structure, please be sure | |
80 | this code is fixed accordingly. | |
81 | It should never copy any pad contained in the structure | |
82 | to avoid security leaks, but must copy the generic | |
83 | 3 ints plus the relevant union member. | |
84 | This routine must convert siginfo from 64bit to 32bit as well | |
85 | at the same time. */ | |
86 | err = __put_user(from->si_signo, &to->si_signo); | |
87 | err |= __put_user(from->si_errno, &to->si_errno); | |
88 | err |= __put_user((short)from->si_code, &to->si_code); | |
89 | if (from->si_code < 0) | |
90 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
91 | else { | |
92 | switch (from->si_code >> 16) { | |
93 | case __SI_TIMER >> 16: | |
94 | err |= __put_user(from->si_tid, &to->si_tid); | |
95 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
96 | err |= __put_user(from->si_int, &to->si_int); | |
97 | break; | |
98 | case __SI_CHLD >> 16: | |
99 | err |= __put_user(from->si_utime, &to->si_utime); | |
100 | err |= __put_user(from->si_stime, &to->si_stime); | |
101 | err |= __put_user(from->si_status, &to->si_status); | |
102 | default: | |
103 | err |= __put_user(from->si_pid, &to->si_pid); | |
104 | err |= __put_user(from->si_uid, &to->si_uid); | |
105 | break; | |
106 | case __SI_FAULT >> 16: | |
1da177e4 LT |
107 | err |= __put_user(from->si_trapno, &to->si_trapno); |
108 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); | |
109 | break; | |
9c7d3b3a JS |
110 | case __SI_POLL >> 16: |
111 | err |= __put_user(from->si_band, &to->si_band); | |
112 | err |= __put_user(from->si_fd, &to->si_fd); | |
113 | break; | |
1da177e4 LT |
114 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
115 | case __SI_MESGQ >> 16: | |
116 | err |= __put_user(from->si_pid, &to->si_pid); | |
117 | err |= __put_user(from->si_uid, &to->si_uid); | |
118 | err |= __put_user(from->si_int, &to->si_int); | |
119 | break; | |
120 | } | |
121 | } | |
122 | return err; | |
123 | } | |
124 | ||
125 | /* CAUTION: This is just a very minimalist implementation for the | |
126 | * sake of compat_sys_rt_sigqueueinfo() | |
127 | */ | |
128 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
129 | { | |
130 | if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) | |
131 | return -EFAULT; | |
132 | ||
133 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
134 | copy_from_user(to->_sifields._pad, from->_sifields._pad, | |
135 | SI_PAD_SIZE)) | |
136 | return -EFAULT; | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
5526b7e4 | 141 | void do_sigreturn32(struct pt_regs *regs) |
1da177e4 | 142 | { |
5526b7e4 | 143 | struct signal_frame32 __user *sf; |
5598473a DM |
144 | compat_uptr_t fpu_save; |
145 | compat_uptr_t rwin_save; | |
1da177e4 | 146 | unsigned int psr; |
5598473a | 147 | unsigned pc, npc; |
1da177e4 | 148 | sigset_t set; |
c19ac326 | 149 | compat_sigset_t seta; |
1da177e4 LT |
150 | int err, i; |
151 | ||
5526b7e4 DM |
152 | /* Always make any pending restarted system calls return -EINTR */ |
153 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
154 | ||
155 | synchronize_user_stack(); | |
156 | ||
1da177e4 | 157 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
5526b7e4 | 158 | sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; |
1da177e4 LT |
159 | |
160 | /* 1. Make sure we are not getting garbage from the user */ | |
161 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
162 | (((unsigned long) sf) & 3)) | |
163 | goto segv; | |
164 | ||
187cd44e AV |
165 | if (get_user(pc, &sf->info.si_regs.pc) || |
166 | __get_user(npc, &sf->info.si_regs.npc)) | |
167 | goto segv; | |
1da177e4 LT |
168 | |
169 | if ((pc | npc) & 3) | |
170 | goto segv; | |
171 | ||
172 | if (test_thread_flag(TIF_32BIT)) { | |
173 | pc &= 0xffffffff; | |
174 | npc &= 0xffffffff; | |
175 | } | |
176 | regs->tpc = pc; | |
177 | regs->tnpc = npc; | |
178 | ||
179 | /* 2. Restore the state */ | |
180 | err = __get_user(regs->y, &sf->info.si_regs.y); | |
181 | err |= __get_user(psr, &sf->info.si_regs.psr); | |
182 | ||
183 | for (i = UREG_G1; i <= UREG_I7; i++) | |
184 | err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
185 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
186 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
187 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
188 | unsigned long asi; | |
189 | ||
190 | for (i = UREG_G1; i <= UREG_I7; i++) | |
191 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
192 | err |= __get_user(asi, &sf->v8plus.asi); | |
193 | regs->tstate &= ~TSTATE_ASI; | |
194 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
195 | } | |
196 | } | |
197 | ||
198 | /* User can only change condition codes in %tstate. */ | |
199 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
200 | regs->tstate |= psr_to_tstate_icc(psr); | |
201 | ||
2678fefe | 202 | /* Prevent syscall restart. */ |
28e61036 | 203 | pt_regs_clear_syscall(regs); |
2678fefe | 204 | |
1da177e4 | 205 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
206 | if (!err && fpu_save) |
207 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
208 | err |= __get_user(rwin_save, &sf->rwin_save); | |
209 | if (!err && rwin_save) { | |
210 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
211 | goto segv; | |
212 | } | |
c19ac326 SR |
213 | err |= __get_user(seta.sig[0], &sf->info.si_mask); |
214 | err |= copy_from_user(&seta.sig[1], &sf->extramask, | |
1da177e4 LT |
215 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
216 | if (err) | |
217 | goto segv; | |
c19ac326 SR |
218 | |
219 | set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); | |
faddf598 | 220 | set_current_blocked(&set); |
1da177e4 LT |
221 | return; |
222 | ||
223 | segv: | |
224 | force_sig(SIGSEGV, current); | |
225 | } | |
226 | ||
1da177e4 LT |
227 | asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
228 | { | |
229 | struct rt_signal_frame32 __user *sf; | |
99b06feb | 230 | unsigned int psr, pc, npc; |
5598473a DM |
231 | compat_uptr_t fpu_save; |
232 | compat_uptr_t rwin_save; | |
1da177e4 LT |
233 | sigset_t set; |
234 | compat_sigset_t seta; | |
1da177e4 LT |
235 | int err, i; |
236 | ||
237 | /* Always make any pending restarted system calls return -EINTR */ | |
238 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
239 | ||
240 | synchronize_user_stack(); | |
241 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
242 | sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; | |
243 | ||
244 | /* 1. Make sure we are not getting garbage from the user */ | |
245 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
246 | (((unsigned long) sf) & 3)) | |
247 | goto segv; | |
248 | ||
187cd44e AV |
249 | if (get_user(pc, &sf->regs.pc) || |
250 | __get_user(npc, &sf->regs.npc)) | |
251 | goto segv; | |
1da177e4 LT |
252 | |
253 | if ((pc | npc) & 3) | |
254 | goto segv; | |
255 | ||
256 | if (test_thread_flag(TIF_32BIT)) { | |
257 | pc &= 0xffffffff; | |
258 | npc &= 0xffffffff; | |
259 | } | |
260 | regs->tpc = pc; | |
261 | regs->tnpc = npc; | |
262 | ||
263 | /* 2. Restore the state */ | |
264 | err = __get_user(regs->y, &sf->regs.y); | |
265 | err |= __get_user(psr, &sf->regs.psr); | |
266 | ||
267 | for (i = UREG_G1; i <= UREG_I7; i++) | |
268 | err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
269 | if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { | |
270 | err |= __get_user(i, &sf->v8plus.g_upper[0]); | |
271 | if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { | |
272 | unsigned long asi; | |
273 | ||
274 | for (i = UREG_G1; i <= UREG_I7; i++) | |
275 | err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); | |
276 | err |= __get_user(asi, &sf->v8plus.asi); | |
277 | regs->tstate &= ~TSTATE_ASI; | |
278 | regs->tstate |= ((asi & 0xffUL) << 24UL); | |
279 | } | |
280 | } | |
281 | ||
282 | /* User can only change condition codes in %tstate. */ | |
283 | regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); | |
284 | regs->tstate |= psr_to_tstate_icc(psr); | |
285 | ||
2678fefe | 286 | /* Prevent syscall restart. */ |
28e61036 | 287 | pt_regs_clear_syscall(regs); |
2678fefe | 288 | |
1da177e4 | 289 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a DM |
290 | if (!err && fpu_save) |
291 | err |= restore_fpu_state(regs, compat_ptr(fpu_save)); | |
1da177e4 | 292 | err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t)); |
99b06feb | 293 | err |= compat_restore_altstack(&sf->stack); |
1da177e4 LT |
294 | if (err) |
295 | goto segv; | |
296 | ||
5598473a DM |
297 | err |= __get_user(rwin_save, &sf->rwin_save); |
298 | if (!err && rwin_save) { | |
299 | if (restore_rwin_state(compat_ptr(rwin_save))) | |
300 | goto segv; | |
301 | } | |
302 | ||
c19ac326 | 303 | set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); |
faddf598 | 304 | set_current_blocked(&set); |
1da177e4 LT |
305 | return; |
306 | segv: | |
307 | force_sig(SIGSEGV, current); | |
308 | } | |
309 | ||
310 | /* Checks if the fp is valid */ | |
311 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
312 | { | |
313 | if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen) | |
314 | return 1; | |
315 | return 0; | |
316 | } | |
317 | ||
08f73957 | 318 | static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) |
1da177e4 LT |
319 | { |
320 | unsigned long sp; | |
321 | ||
322 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; | |
323 | sp = regs->u_regs[UREG_FP]; | |
324 | ||
dc5dc7e6 DM |
325 | /* |
326 | * If we are on the alternate signal stack and would overflow it, don't. | |
327 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
328 | */ | |
329 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) | |
330 | return (void __user *) -1L; | |
331 | ||
1da177e4 | 332 | /* This is the X/Open sanctioned signal stack switching. */ |
08f73957 | 333 | sp = sigsp(sp, ksig) - framesize; |
f036d9f3 | 334 | |
dc5dc7e6 DM |
335 | /* Always align the stack frame. This handles two cases. First, |
336 | * sigaltstack need not be mindful of platform specific stack | |
337 | * alignment. Second, if we took this signal because the stack | |
338 | * is not aligned properly, we'd like to take the signal cleanly | |
339 | * and report that. | |
340 | */ | |
f036d9f3 | 341 | sp &= ~15UL; |
dc5dc7e6 | 342 | |
f036d9f3 | 343 | return (void __user *) sp; |
1da177e4 LT |
344 | } |
345 | ||
05c5e769 DM |
346 | /* The I-cache flush instruction only works in the primary ASI, which |
347 | * right now is the nucleus, aka. kernel space. | |
348 | * | |
349 | * Therefore we have to kick the instructions out using the kernel | |
350 | * side linear mapping of the physical address backing the user | |
351 | * instructions. | |
352 | */ | |
353 | static void flush_signal_insns(unsigned long address) | |
354 | { | |
355 | unsigned long pstate, paddr; | |
356 | pte_t *ptep, pte; | |
357 | pgd_t *pgdp; | |
358 | pud_t *pudp; | |
359 | pmd_t *pmdp; | |
360 | ||
361 | /* Commit all stores of the instructions we are about to flush. */ | |
362 | wmb(); | |
363 | ||
364 | /* Disable cross-call reception. In this way even a very wide | |
365 | * munmap() on another cpu can't tear down the page table | |
366 | * hierarchy from underneath us, since that can't complete | |
367 | * until the IPI tlb flush returns. | |
368 | */ | |
369 | ||
370 | __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); | |
371 | __asm__ __volatile__("wrpr %0, %1, %%pstate" | |
372 | : : "r" (pstate), "i" (PSTATE_IE)); | |
373 | ||
374 | pgdp = pgd_offset(current->mm, address); | |
375 | if (pgd_none(*pgdp)) | |
376 | goto out_irqs_on; | |
377 | pudp = pud_offset(pgdp, address); | |
378 | if (pud_none(*pudp)) | |
379 | goto out_irqs_on; | |
380 | pmdp = pmd_offset(pudp, address); | |
381 | if (pmd_none(*pmdp)) | |
382 | goto out_irqs_on; | |
383 | ||
384 | ptep = pte_offset_map(pmdp, address); | |
385 | pte = *ptep; | |
386 | if (!pte_present(pte)) | |
387 | goto out_unmap; | |
388 | ||
389 | paddr = (unsigned long) page_address(pte_page(pte)); | |
390 | ||
391 | __asm__ __volatile__("flush %0 + %1" | |
392 | : /* no outputs */ | |
393 | : "r" (paddr), | |
394 | "r" (address & (PAGE_SIZE - 1)) | |
395 | : "memory"); | |
396 | ||
397 | out_unmap: | |
398 | pte_unmap(ptep); | |
399 | out_irqs_on: | |
400 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); | |
401 | ||
402 | } | |
403 | ||
08f73957 AV |
404 | static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, |
405 | sigset_t *oldset) | |
1da177e4 | 406 | { |
5526b7e4 | 407 | struct signal_frame32 __user *sf; |
5598473a DM |
408 | int i, err, wsaved; |
409 | void __user *tail; | |
1da177e4 LT |
410 | int sigframe_size; |
411 | u32 psr; | |
c19ac326 | 412 | compat_sigset_t seta; |
1da177e4 LT |
413 | |
414 | /* 1. Make sure everything is clean */ | |
415 | synchronize_user_stack(); | |
416 | save_and_clear_fpu(); | |
417 | ||
5598473a DM |
418 | wsaved = get_thread_wsaved(); |
419 | ||
420 | sigframe_size = sizeof(*sf); | |
421 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
422 | sigframe_size += sizeof(__siginfo_fpu_t); | |
423 | if (wsaved) | |
424 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 | 425 | |
5526b7e4 | 426 | sf = (struct signal_frame32 __user *) |
08f73957 | 427 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 428 | |
08f73957 AV |
429 | if (invalid_frame_pointer(sf, sigframe_size)) { |
430 | do_exit(SIGILL); | |
431 | return -EINVAL; | |
432 | } | |
1da177e4 | 433 | |
5598473a | 434 | tail = (sf + 1); |
1da177e4 LT |
435 | |
436 | /* 2. Save the current process state */ | |
437 | if (test_thread_flag(TIF_32BIT)) { | |
438 | regs->tpc &= 0xffffffff; | |
439 | regs->tnpc &= 0xffffffff; | |
440 | } | |
441 | err = put_user(regs->tpc, &sf->info.si_regs.pc); | |
442 | err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); | |
443 | err |= __put_user(regs->y, &sf->info.si_regs.y); | |
444 | psr = tstate_to_psr(regs->tstate); | |
445 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
446 | psr |= PSR_EF; | |
447 | err |= __put_user(psr, &sf->info.si_regs.psr); | |
448 | for (i = 0; i < 16; i++) | |
449 | err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); | |
450 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
451 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
452 | for (i = 1; i < 16; i++) | |
453 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
454 | &sf->v8plus.g_upper[i]); | |
455 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
456 | &sf->v8plus.asi); | |
457 | ||
458 | if (psr & PSR_EF) { | |
5598473a DM |
459 | __siginfo_fpu_t __user *fp = tail; |
460 | tail += sizeof(*fp); | |
461 | err |= save_fpu_state(regs, fp); | |
462 | err |= __put_user((u64)fp, &sf->fpu_save); | |
1da177e4 LT |
463 | } else { |
464 | err |= __put_user(0, &sf->fpu_save); | |
465 | } | |
5598473a DM |
466 | if (wsaved) { |
467 | __siginfo_rwin_t __user *rwp = tail; | |
468 | tail += sizeof(*rwp); | |
469 | err |= save_rwin_state(wsaved, rwp); | |
470 | err |= __put_user((u64)rwp, &sf->rwin_save); | |
471 | set_thread_wsaved(0); | |
472 | } else { | |
473 | err |= __put_user(0, &sf->rwin_save); | |
474 | } | |
1da177e4 | 475 | |
c19ac326 SR |
476 | /* If these change we need to know - assignments to seta relies on these sizes */ |
477 | BUILD_BUG_ON(_NSIG_WORDS != 1); | |
478 | BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2); | |
479 | seta.sig[1] = (oldset->sig[0] >> 32); | |
480 | seta.sig[0] = oldset->sig[0]; | |
481 | ||
482 | err |= __put_user(seta.sig[0], &sf->info.si_mask); | |
483 | err |= __copy_to_user(sf->extramask, &seta.sig[1], | |
1da177e4 LT |
484 | (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
485 | ||
5598473a DM |
486 | if (!wsaved) { |
487 | err |= copy_in_user((u32 __user *)sf, | |
488 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
489 | sizeof(struct reg_window32)); | |
490 | } else { | |
491 | struct reg_window *rp; | |
492 | ||
493 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
494 | for (i = 0; i < 8; i++) | |
495 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); | |
496 | for (i = 0; i < 6; i++) | |
497 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); | |
498 | err |= __put_user(rp->ins[6], &sf->ss.fp); | |
499 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); | |
500 | } | |
1da177e4 | 501 | if (err) |
08f73957 | 502 | return err; |
1da177e4 LT |
503 | |
504 | /* 3. signal handler back-trampoline and parameters */ | |
505 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 506 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
507 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
508 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
509 | ||
510 | /* 4. signal handler */ | |
08f73957 | 511 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
512 | regs->tnpc = (regs->tpc + 4); |
513 | if (test_thread_flag(TIF_32BIT)) { | |
514 | regs->tpc &= 0xffffffff; | |
515 | regs->tnpc &= 0xffffffff; | |
516 | } | |
517 | ||
518 | /* 5. return to kernel instructions */ | |
08f73957 AV |
519 | if (ksig->ka.ka_restorer) { |
520 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 | 521 | } else { |
1da177e4 | 522 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
523 | |
524 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
525 | ||
526 | err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ | |
527 | err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ | |
528 | if (err) | |
08f73957 | 529 | return err; |
05c5e769 | 530 | flush_signal_insns(address); |
1da177e4 | 531 | } |
c2785259 | 532 | return 0; |
1da177e4 LT |
533 | } |
534 | ||
08f73957 AV |
535 | static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, |
536 | sigset_t *oldset) | |
1da177e4 LT |
537 | { |
538 | struct rt_signal_frame32 __user *sf; | |
5598473a DM |
539 | int i, err, wsaved; |
540 | void __user *tail; | |
1da177e4 LT |
541 | int sigframe_size; |
542 | u32 psr; | |
1da177e4 LT |
543 | compat_sigset_t seta; |
544 | ||
545 | /* 1. Make sure everything is clean */ | |
546 | synchronize_user_stack(); | |
547 | save_and_clear_fpu(); | |
548 | ||
5598473a DM |
549 | wsaved = get_thread_wsaved(); |
550 | ||
551 | sigframe_size = sizeof(*sf); | |
552 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
553 | sigframe_size += sizeof(__siginfo_fpu_t); | |
554 | if (wsaved) | |
555 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 LT |
556 | |
557 | sf = (struct rt_signal_frame32 __user *) | |
08f73957 | 558 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 559 | |
08f73957 AV |
560 | if (invalid_frame_pointer(sf, sigframe_size)) { |
561 | do_exit(SIGILL); | |
562 | return -EINVAL; | |
563 | } | |
1da177e4 | 564 | |
5598473a | 565 | tail = (sf + 1); |
1da177e4 LT |
566 | |
567 | /* 2. Save the current process state */ | |
568 | if (test_thread_flag(TIF_32BIT)) { | |
569 | regs->tpc &= 0xffffffff; | |
570 | regs->tnpc &= 0xffffffff; | |
571 | } | |
572 | err = put_user(regs->tpc, &sf->regs.pc); | |
573 | err |= __put_user(regs->tnpc, &sf->regs.npc); | |
574 | err |= __put_user(regs->y, &sf->regs.y); | |
575 | psr = tstate_to_psr(regs->tstate); | |
576 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) | |
577 | psr |= PSR_EF; | |
578 | err |= __put_user(psr, &sf->regs.psr); | |
579 | for (i = 0; i < 16; i++) | |
580 | err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); | |
581 | err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); | |
582 | err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); | |
583 | for (i = 1; i < 16; i++) | |
584 | err |= __put_user(((u32 *)regs->u_regs)[2*i], | |
585 | &sf->v8plus.g_upper[i]); | |
586 | err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, | |
587 | &sf->v8plus.asi); | |
588 | ||
589 | if (psr & PSR_EF) { | |
5598473a DM |
590 | __siginfo_fpu_t __user *fp = tail; |
591 | tail += sizeof(*fp); | |
592 | err |= save_fpu_state(regs, fp); | |
593 | err |= __put_user((u64)fp, &sf->fpu_save); | |
1da177e4 LT |
594 | } else { |
595 | err |= __put_user(0, &sf->fpu_save); | |
596 | } | |
5598473a DM |
597 | if (wsaved) { |
598 | __siginfo_rwin_t __user *rwp = tail; | |
599 | tail += sizeof(*rwp); | |
600 | err |= save_rwin_state(wsaved, rwp); | |
601 | err |= __put_user((u64)rwp, &sf->rwin_save); | |
602 | set_thread_wsaved(0); | |
603 | } else { | |
604 | err |= __put_user(0, &sf->rwin_save); | |
605 | } | |
1da177e4 LT |
606 | |
607 | /* Update the siginfo structure. */ | |
08f73957 | 608 | err |= copy_siginfo_to_user32(&sf->info, &ksig->info); |
1da177e4 LT |
609 | |
610 | /* Setup sigaltstack */ | |
99b06feb | 611 | err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); |
1da177e4 | 612 | |
c19ac326 SR |
613 | seta.sig[1] = (oldset->sig[0] >> 32); |
614 | seta.sig[0] = oldset->sig[0]; | |
1da177e4 LT |
615 | err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t)); |
616 | ||
5598473a DM |
617 | if (!wsaved) { |
618 | err |= copy_in_user((u32 __user *)sf, | |
619 | (u32 __user *)(regs->u_regs[UREG_FP]), | |
620 | sizeof(struct reg_window32)); | |
621 | } else { | |
622 | struct reg_window *rp; | |
623 | ||
624 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
625 | for (i = 0; i < 8; i++) | |
626 | err |= __put_user(rp->locals[i], &sf->ss.locals[i]); | |
627 | for (i = 0; i < 6; i++) | |
628 | err |= __put_user(rp->ins[i], &sf->ss.ins[i]); | |
629 | err |= __put_user(rp->ins[6], &sf->ss.fp); | |
630 | err |= __put_user(rp->ins[7], &sf->ss.callers_pc); | |
631 | } | |
1da177e4 | 632 | if (err) |
08f73957 | 633 | return err; |
1da177e4 LT |
634 | |
635 | /* 3. signal handler back-trampoline and parameters */ | |
636 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 637 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
638 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
639 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
640 | ||
641 | /* 4. signal handler */ | |
08f73957 | 642 | regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
643 | regs->tnpc = (regs->tpc + 4); |
644 | if (test_thread_flag(TIF_32BIT)) { | |
645 | regs->tpc &= 0xffffffff; | |
646 | regs->tnpc &= 0xffffffff; | |
647 | } | |
648 | ||
649 | /* 5. return to kernel instructions */ | |
08f73957 AV |
650 | if (ksig->ka.ka_restorer) |
651 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 | 652 | else { |
1da177e4 | 653 | unsigned long address = ((unsigned long)&(sf->insns[0])); |
1da177e4 LT |
654 | |
655 | regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); | |
656 | ||
657 | /* mov __NR_rt_sigreturn, %g1 */ | |
658 | err |= __put_user(0x82102065, &sf->insns[0]); | |
659 | ||
660 | /* t 0x10 */ | |
661 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
662 | if (err) | |
08f73957 | 663 | return err; |
1da177e4 | 664 | |
05c5e769 | 665 | flush_signal_insns(address); |
1da177e4 | 666 | } |
392c2180 | 667 | return 0; |
1da177e4 LT |
668 | } |
669 | ||
08f73957 AV |
670 | static inline void handle_signal32(struct ksignal *ksig, |
671 | struct pt_regs *regs) | |
1da177e4 | 672 | { |
08f73957 | 673 | sigset_t *oldset = sigmask_to_save(); |
392c2180 DM |
674 | int err; |
675 | ||
08f73957 AV |
676 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
677 | err = setup_rt_frame32(ksig, regs, oldset); | |
ec98c6b9 | 678 | else |
08f73957 | 679 | err = setup_frame32(ksig, regs, oldset); |
392c2180 | 680 | |
08f73957 | 681 | signal_setup_done(err, ksig, 0); |
1da177e4 LT |
682 | } |
683 | ||
684 | static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, | |
685 | struct sigaction *sa) | |
686 | { | |
687 | switch (regs->u_regs[UREG_I0]) { | |
688 | case ERESTART_RESTARTBLOCK: | |
689 | case ERESTARTNOHAND: | |
690 | no_system_call_restart: | |
691 | regs->u_regs[UREG_I0] = EINTR; | |
692 | regs->tstate |= TSTATE_ICARRY; | |
693 | break; | |
694 | case ERESTARTSYS: | |
695 | if (!(sa->sa_flags & SA_RESTART)) | |
696 | goto no_system_call_restart; | |
697 | /* fallthrough */ | |
698 | case ERESTARTNOINTR: | |
699 | regs->u_regs[UREG_I0] = orig_i0; | |
700 | regs->tpc -= 4; | |
701 | regs->tnpc -= 4; | |
702 | } | |
703 | } | |
704 | ||
705 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
706 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
707 | * mistake. | |
708 | */ | |
dfbb83d3 | 709 | void do_signal32(struct pt_regs * regs) |
1da177e4 | 710 | { |
08f73957 AV |
711 | struct ksignal ksig; |
712 | unsigned long orig_i0 = 0; | |
713 | int restart_syscall = 0; | |
714 | bool has_handler = get_signal(&ksig); | |
28e61036 | 715 | |
1d299bc7 DM |
716 | if (pt_regs_is_syscall(regs) && |
717 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { | |
718 | restart_syscall = 1; | |
e88d2468 | 719 | orig_i0 = regs->u_regs[UREG_G6]; |
1d299bc7 | 720 | } |
28e61036 | 721 | |
08f73957 | 722 | if (has_handler) { |
28e61036 | 723 | if (restart_syscall) |
08f73957 AV |
724 | syscall_restart32(orig_i0, regs, &ksig.ka.sa); |
725 | handle_signal32(&ksig, regs); | |
726 | } else { | |
727 | if (restart_syscall) { | |
728 | switch (regs->u_regs[UREG_I0]) { | |
729 | case ERESTARTNOHAND: | |
730 | case ERESTARTSYS: | |
731 | case ERESTARTNOINTR: | |
732 | /* replay the system call when we are done */ | |
733 | regs->u_regs[UREG_I0] = orig_i0; | |
734 | regs->tpc -= 4; | |
735 | regs->tnpc -= 4; | |
736 | pt_regs_clear_syscall(regs); | |
737 | case ERESTART_RESTARTBLOCK: | |
738 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
739 | regs->tpc -= 4; | |
740 | regs->tnpc -= 4; | |
741 | pt_regs_clear_syscall(regs); | |
742 | } | |
743 | } | |
744 | restore_saved_sigmask(); | |
1da177e4 | 745 | } |
1da177e4 LT |
746 | } |
747 | ||
748 | struct sigstack32 { | |
749 | u32 the_stack; | |
750 | int cur_status; | |
751 | }; | |
752 | ||
753 | asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) | |
754 | { | |
755 | struct sigstack32 __user *ssptr = | |
756 | (struct sigstack32 __user *)((unsigned long)(u_ssptr)); | |
757 | struct sigstack32 __user *ossptr = | |
758 | (struct sigstack32 __user *)((unsigned long)(u_ossptr)); | |
759 | int ret = -EFAULT; | |
760 | ||
761 | /* First see if old state is wanted. */ | |
762 | if (ossptr) { | |
763 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
764 | &ossptr->the_stack) || | |
765 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
766 | goto out; | |
767 | } | |
768 | ||
769 | /* Now see if we want to update the new state. */ | |
770 | if (ssptr) { | |
771 | u32 ss_sp; | |
772 | ||
773 | if (get_user(ss_sp, &ssptr->the_stack)) | |
774 | goto out; | |
775 | ||
776 | /* If the current stack was set with sigaltstack, don't | |
777 | * swap stacks while we are on it. | |
778 | */ | |
779 | ret = -EPERM; | |
780 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
781 | goto out; | |
782 | ||
783 | /* Since we don't know the extent of the stack, and we don't | |
784 | * track onstack-ness, but rather calculate it, we must | |
785 | * presume a size. Ho hum this interface is lossy. | |
786 | */ | |
787 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
788 | current->sas_ss_size = SIGSTKSZ; | |
789 | } | |
790 | ||
791 | ret = 0; | |
792 | out: | |
793 | return ret; | |
794 | } |