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1da177e4 LT |
1 | /* $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $ |
2 | * arch/sparc64/kernel/signal.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
6 | * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) | |
7 | * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) | |
8 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
9 | */ | |
10 | ||
11 | #include <linux/config.h> | |
12 | #ifdef CONFIG_SPARC32_COMPAT | |
13 | #include <linux/compat.h> /* for compat_old_sigset_t */ | |
14 | #endif | |
15 | #include <linux/sched.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/signal.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/unistd.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/tty.h> | |
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/binfmts.h> | |
26 | #include <linux/bitops.h> | |
27 | ||
28 | #include <asm/uaccess.h> | |
29 | #include <asm/ptrace.h> | |
30 | #include <asm/svr4.h> | |
31 | #include <asm/pgtable.h> | |
32 | #include <asm/fpumacro.h> | |
33 | #include <asm/uctx.h> | |
34 | #include <asm/siginfo.h> | |
35 | #include <asm/visasm.h> | |
36 | ||
37 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
38 | ||
39 | static int do_signal(sigset_t *oldset, struct pt_regs * regs, | |
40 | unsigned long orig_o0, int ret_from_syscall); | |
41 | ||
42 | /* {set, get}context() needed for 64-bit SparcLinux userland. */ | |
43 | asmlinkage void sparc64_set_context(struct pt_regs *regs) | |
44 | { | |
45 | struct ucontext __user *ucp = (struct ucontext __user *) | |
46 | regs->u_regs[UREG_I0]; | |
47 | mc_gregset_t __user *grp; | |
48 | unsigned long pc, npc, tstate; | |
49 | unsigned long fp, i7; | |
50 | unsigned char fenab; | |
51 | int err; | |
52 | ||
53 | flush_user_windows(); | |
54 | if (get_thread_wsaved() || | |
55 | (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || | |
56 | (!__access_ok(ucp, sizeof(*ucp)))) | |
57 | goto do_sigsegv; | |
58 | grp = &ucp->uc_mcontext.mc_gregs; | |
59 | err = __get_user(pc, &((*grp)[MC_PC])); | |
60 | err |= __get_user(npc, &((*grp)[MC_NPC])); | |
61 | if (err || ((pc | npc) & 3)) | |
62 | goto do_sigsegv; | |
63 | if (regs->u_regs[UREG_I1]) { | |
64 | sigset_t set; | |
65 | ||
66 | if (_NSIG_WORDS == 1) { | |
67 | if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) | |
68 | goto do_sigsegv; | |
69 | } else { | |
70 | if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) | |
71 | goto do_sigsegv; | |
72 | } | |
73 | sigdelsetmask(&set, ~_BLOCKABLE); | |
74 | spin_lock_irq(¤t->sighand->siglock); | |
75 | current->blocked = set; | |
76 | recalc_sigpending(); | |
77 | spin_unlock_irq(¤t->sighand->siglock); | |
78 | } | |
79 | if (test_thread_flag(TIF_32BIT)) { | |
80 | pc &= 0xffffffff; | |
81 | npc &= 0xffffffff; | |
82 | } | |
83 | regs->tpc = pc; | |
84 | regs->tnpc = npc; | |
85 | err |= __get_user(regs->y, &((*grp)[MC_Y])); | |
86 | err |= __get_user(tstate, &((*grp)[MC_TSTATE])); | |
87 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); | |
88 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); | |
89 | err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); | |
90 | err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); | |
91 | err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); | |
92 | err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); | |
93 | err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); | |
94 | err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); | |
95 | err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7])); | |
96 | err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); | |
97 | err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); | |
98 | err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); | |
99 | err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); | |
100 | err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); | |
101 | err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); | |
102 | err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); | |
103 | err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); | |
104 | ||
105 | err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); | |
106 | err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); | |
107 | err |= __put_user(fp, | |
108 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); | |
109 | err |= __put_user(i7, | |
110 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); | |
111 | ||
112 | err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); | |
113 | if (fenab) { | |
114 | unsigned long *fpregs = current_thread_info()->fpregs; | |
115 | unsigned long fprs; | |
116 | ||
117 | fprs_write(0); | |
118 | err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); | |
119 | if (fprs & FPRS_DL) | |
120 | err |= copy_from_user(fpregs, | |
121 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), | |
122 | (sizeof(unsigned int) * 32)); | |
123 | if (fprs & FPRS_DU) | |
124 | err |= copy_from_user(fpregs+16, | |
125 | ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, | |
126 | (sizeof(unsigned int) * 32)); | |
127 | err |= __get_user(current_thread_info()->xfsr[0], | |
128 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); | |
129 | err |= __get_user(current_thread_info()->gsr[0], | |
130 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); | |
131 | regs->tstate &= ~TSTATE_PEF; | |
132 | } | |
133 | if (err) | |
134 | goto do_sigsegv; | |
135 | ||
136 | return; | |
137 | do_sigsegv: | |
138 | force_sig(SIGSEGV, current); | |
139 | } | |
140 | ||
141 | asmlinkage void sparc64_get_context(struct pt_regs *regs) | |
142 | { | |
143 | struct ucontext __user *ucp = (struct ucontext __user *) | |
144 | regs->u_regs[UREG_I0]; | |
145 | mc_gregset_t __user *grp; | |
146 | mcontext_t __user *mcp; | |
147 | unsigned long fp, i7; | |
148 | unsigned char fenab; | |
149 | int err; | |
150 | ||
151 | synchronize_user_stack(); | |
152 | if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) | |
153 | goto do_sigsegv; | |
154 | ||
155 | #if 1 | |
156 | fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ | |
157 | #else | |
158 | fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); | |
159 | #endif | |
160 | ||
161 | mcp = &ucp->uc_mcontext; | |
162 | grp = &mcp->mc_gregs; | |
163 | ||
164 | /* Skip over the trap instruction, first. */ | |
165 | if (test_thread_flag(TIF_32BIT)) { | |
166 | regs->tpc = (regs->tnpc & 0xffffffff); | |
167 | regs->tnpc = (regs->tnpc + 4) & 0xffffffff; | |
168 | } else { | |
169 | regs->tpc = regs->tnpc; | |
170 | regs->tnpc += 4; | |
171 | } | |
172 | err = 0; | |
173 | if (_NSIG_WORDS == 1) | |
174 | err |= __put_user(current->blocked.sig[0], | |
175 | (unsigned long __user *)&ucp->uc_sigmask); | |
176 | else | |
177 | err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, | |
178 | sizeof(sigset_t)); | |
179 | ||
180 | err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); | |
181 | err |= __put_user(regs->tpc, &((*grp)[MC_PC])); | |
182 | err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); | |
183 | err |= __put_user(regs->y, &((*grp)[MC_Y])); | |
184 | err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); | |
185 | err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); | |
186 | err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); | |
187 | err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); | |
188 | err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); | |
189 | err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); | |
190 | err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); | |
191 | err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); | |
192 | err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); | |
193 | err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); | |
194 | err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); | |
195 | err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); | |
196 | err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); | |
197 | err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); | |
198 | err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); | |
199 | ||
200 | err |= __get_user(fp, | |
201 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); | |
202 | err |= __get_user(i7, | |
203 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); | |
204 | err |= __put_user(fp, &(mcp->mc_fp)); | |
205 | err |= __put_user(i7, &(mcp->mc_i7)); | |
206 | ||
207 | err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); | |
208 | if (fenab) { | |
209 | unsigned long *fpregs = current_thread_info()->fpregs; | |
210 | unsigned long fprs; | |
211 | ||
212 | fprs = current_thread_info()->fpsaved[0]; | |
213 | if (fprs & FPRS_DL) | |
214 | err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, | |
215 | (sizeof(unsigned int) * 32)); | |
216 | if (fprs & FPRS_DU) | |
217 | err |= copy_to_user( | |
218 | ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, | |
219 | (sizeof(unsigned int) * 32)); | |
220 | err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); | |
221 | err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); | |
222 | err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); | |
223 | } | |
224 | if (err) | |
225 | goto do_sigsegv; | |
226 | ||
227 | return; | |
228 | do_sigsegv: | |
229 | force_sig(SIGSEGV, current); | |
230 | } | |
231 | ||
232 | struct rt_signal_frame { | |
233 | struct sparc_stackf ss; | |
234 | siginfo_t info; | |
235 | struct pt_regs regs; | |
236 | __siginfo_fpu_t __user *fpu_save; | |
237 | stack_t stack; | |
238 | sigset_t mask; | |
239 | __siginfo_fpu_t fpu_state; | |
240 | }; | |
241 | ||
242 | /* Align macros */ | |
243 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) | |
244 | ||
245 | /* | |
246 | * atomically swap in the new signal mask, and wait for a signal. | |
247 | * This is really tricky on the Sparc, watch out... | |
248 | */ | |
249 | asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs) | |
250 | { | |
251 | sigset_t saveset; | |
252 | ||
253 | #ifdef CONFIG_SPARC32_COMPAT | |
254 | if (test_thread_flag(TIF_32BIT)) { | |
255 | extern asmlinkage void _sigpause32_common(compat_old_sigset_t, | |
256 | struct pt_regs *); | |
257 | _sigpause32_common(set, regs); | |
258 | return; | |
259 | } | |
260 | #endif | |
261 | set &= _BLOCKABLE; | |
262 | spin_lock_irq(¤t->sighand->siglock); | |
263 | saveset = current->blocked; | |
264 | siginitset(¤t->blocked, set); | |
265 | recalc_sigpending(); | |
266 | spin_unlock_irq(¤t->sighand->siglock); | |
267 | ||
268 | if (test_thread_flag(TIF_32BIT)) { | |
269 | regs->tpc = (regs->tnpc & 0xffffffff); | |
270 | regs->tnpc = (regs->tnpc + 4) & 0xffffffff; | |
271 | } else { | |
272 | regs->tpc = regs->tnpc; | |
273 | regs->tnpc += 4; | |
274 | } | |
275 | ||
276 | /* Condition codes and return value where set here for sigpause, | |
277 | * and so got used by setup_frame, which again causes sigreturn() | |
278 | * to return -EINTR. | |
279 | */ | |
280 | while (1) { | |
281 | current->state = TASK_INTERRUPTIBLE; | |
282 | schedule(); | |
283 | /* | |
284 | * Return -EINTR and set condition code here, | |
285 | * so the interrupted system call actually returns | |
286 | * these. | |
287 | */ | |
288 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
289 | regs->u_regs[UREG_I0] = EINTR; | |
290 | if (do_signal(&saveset, regs, 0, 0)) | |
291 | return; | |
292 | } | |
293 | } | |
294 | ||
295 | asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs) | |
296 | { | |
297 | _sigpause_common(set, regs); | |
298 | } | |
299 | ||
300 | asmlinkage void do_sigsuspend(struct pt_regs *regs) | |
301 | { | |
302 | _sigpause_common(regs->u_regs[UREG_I0], regs); | |
303 | } | |
304 | ||
305 | asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, struct pt_regs *regs) | |
306 | { | |
307 | sigset_t oldset, set; | |
308 | ||
309 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
310 | if (sigsetsize != sizeof(sigset_t)) { | |
311 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
312 | regs->u_regs[UREG_I0] = EINVAL; | |
313 | return; | |
314 | } | |
315 | if (copy_from_user(&set, uset, sizeof(set))) { | |
316 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
317 | regs->u_regs[UREG_I0] = EFAULT; | |
318 | return; | |
319 | } | |
320 | ||
321 | sigdelsetmask(&set, ~_BLOCKABLE); | |
322 | spin_lock_irq(¤t->sighand->siglock); | |
323 | oldset = current->blocked; | |
324 | current->blocked = set; | |
325 | recalc_sigpending(); | |
326 | spin_unlock_irq(¤t->sighand->siglock); | |
327 | ||
328 | if (test_thread_flag(TIF_32BIT)) { | |
329 | regs->tpc = (regs->tnpc & 0xffffffff); | |
330 | regs->tnpc = (regs->tnpc + 4) & 0xffffffff; | |
331 | } else { | |
332 | regs->tpc = regs->tnpc; | |
333 | regs->tnpc += 4; | |
334 | } | |
335 | ||
336 | /* Condition codes and return value where set here for sigpause, | |
337 | * and so got used by setup_frame, which again causes sigreturn() | |
338 | * to return -EINTR. | |
339 | */ | |
340 | while (1) { | |
341 | current->state = TASK_INTERRUPTIBLE; | |
342 | schedule(); | |
343 | /* | |
344 | * Return -EINTR and set condition code here, | |
345 | * so the interrupted system call actually returns | |
346 | * these. | |
347 | */ | |
348 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
349 | regs->u_regs[UREG_I0] = EINTR; | |
350 | if (do_signal(&oldset, regs, 0, 0)) | |
351 | return; | |
352 | } | |
353 | } | |
354 | ||
355 | static inline int | |
356 | restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
357 | { | |
358 | unsigned long *fpregs = current_thread_info()->fpregs; | |
359 | unsigned long fprs; | |
360 | int err; | |
361 | ||
362 | err = __get_user(fprs, &fpu->si_fprs); | |
363 | fprs_write(0); | |
364 | regs->tstate &= ~TSTATE_PEF; | |
365 | if (fprs & FPRS_DL) | |
366 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], | |
367 | (sizeof(unsigned int) * 32)); | |
368 | if (fprs & FPRS_DU) | |
369 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], | |
370 | (sizeof(unsigned int) * 32)); | |
371 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
372 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
373 | current_thread_info()->fpsaved[0] |= fprs; | |
374 | return err; | |
375 | } | |
376 | ||
377 | void do_rt_sigreturn(struct pt_regs *regs) | |
378 | { | |
379 | struct rt_signal_frame __user *sf; | |
380 | unsigned long tpc, tnpc, tstate; | |
381 | __siginfo_fpu_t __user *fpu_save; | |
382 | mm_segment_t old_fs; | |
383 | sigset_t set; | |
384 | stack_t st; | |
385 | int err; | |
386 | ||
387 | /* Always make any pending restarted system calls return -EINTR */ | |
388 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
389 | ||
390 | synchronize_user_stack (); | |
391 | sf = (struct rt_signal_frame __user *) | |
392 | (regs->u_regs [UREG_FP] + STACK_BIAS); | |
393 | ||
394 | /* 1. Make sure we are not getting garbage from the user */ | |
395 | if (((unsigned long) sf) & 3) | |
396 | goto segv; | |
397 | ||
398 | err = get_user(tpc, &sf->regs.tpc); | |
399 | err |= __get_user(tnpc, &sf->regs.tnpc); | |
400 | if (test_thread_flag(TIF_32BIT)) { | |
401 | tpc &= 0xffffffff; | |
402 | tnpc &= 0xffffffff; | |
403 | } | |
404 | err |= ((tpc | tnpc) & 3); | |
405 | ||
406 | /* 2. Restore the state */ | |
407 | err |= __get_user(regs->y, &sf->regs.y); | |
408 | err |= __get_user(tstate, &sf->regs.tstate); | |
409 | err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); | |
410 | ||
411 | /* User can only change condition codes and %asi in %tstate. */ | |
412 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); | |
413 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); | |
414 | ||
415 | err |= __get_user(fpu_save, &sf->fpu_save); | |
416 | if (fpu_save) | |
417 | err |= restore_fpu_state(regs, &sf->fpu_state); | |
418 | ||
419 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); | |
420 | err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); | |
421 | ||
422 | if (err) | |
423 | goto segv; | |
424 | ||
425 | regs->tpc = tpc; | |
426 | regs->tnpc = tnpc; | |
427 | ||
428 | /* It is more difficult to avoid calling this function than to | |
429 | call it and ignore errors. */ | |
430 | old_fs = get_fs(); | |
431 | set_fs(KERNEL_DS); | |
432 | do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); | |
433 | set_fs(old_fs); | |
434 | ||
435 | sigdelsetmask(&set, ~_BLOCKABLE); | |
436 | spin_lock_irq(¤t->sighand->siglock); | |
437 | current->blocked = set; | |
438 | recalc_sigpending(); | |
439 | spin_unlock_irq(¤t->sighand->siglock); | |
440 | return; | |
441 | segv: | |
442 | force_sig(SIGSEGV, current); | |
443 | } | |
444 | ||
445 | /* Checks if the fp is valid */ | |
446 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
447 | { | |
448 | if (((unsigned long) fp) & 7) | |
449 | return 1; | |
450 | return 0; | |
451 | } | |
452 | ||
453 | static inline int | |
454 | save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
455 | { | |
456 | unsigned long *fpregs = (unsigned long *)(regs+1); | |
457 | unsigned long fprs; | |
458 | int err = 0; | |
459 | ||
460 | fprs = current_thread_info()->fpsaved[0]; | |
461 | if (fprs & FPRS_DL) | |
462 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
463 | (sizeof(unsigned int) * 32)); | |
464 | if (fprs & FPRS_DU) | |
465 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
466 | (sizeof(unsigned int) * 32)); | |
467 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
468 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
469 | err |= __put_user(fprs, &fpu->si_fprs); | |
470 | ||
471 | return err; | |
472 | } | |
473 | ||
474 | static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) | |
475 | { | |
476 | unsigned long sp; | |
477 | ||
478 | sp = regs->u_regs[UREG_FP] + STACK_BIAS; | |
479 | ||
480 | /* This is the X/Open sanctioned signal stack switching. */ | |
481 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
482 | if (!on_sig_stack(sp) && | |
483 | !((current->sas_ss_sp + current->sas_ss_size) & 7)) | |
484 | sp = current->sas_ss_sp + current->sas_ss_size; | |
485 | } | |
486 | return (void __user *)(sp - framesize); | |
487 | } | |
488 | ||
489 | static inline void | |
490 | setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
491 | int signo, sigset_t *oldset, siginfo_t *info) | |
492 | { | |
493 | struct rt_signal_frame __user *sf; | |
494 | int sigframe_size, err; | |
495 | ||
496 | /* 1. Make sure everything is clean */ | |
497 | synchronize_user_stack(); | |
498 | save_and_clear_fpu(); | |
499 | ||
500 | sigframe_size = RT_ALIGNEDSZ; | |
501 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) | |
502 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
503 | ||
504 | sf = (struct rt_signal_frame __user *) | |
505 | get_sigframe(ka, regs, sigframe_size); | |
506 | ||
507 | if (invalid_frame_pointer (sf, sigframe_size)) | |
508 | goto sigill; | |
509 | ||
510 | if (get_thread_wsaved() != 0) | |
511 | goto sigill; | |
512 | ||
513 | /* 2. Save the current process state */ | |
514 | err = copy_to_user(&sf->regs, regs, sizeof (*regs)); | |
515 | ||
516 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) { | |
517 | err |= save_fpu_state(regs, &sf->fpu_state); | |
518 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
519 | } else { | |
520 | err |= __put_user(0, &sf->fpu_save); | |
521 | } | |
522 | ||
523 | /* Setup sigaltstack */ | |
524 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
525 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
526 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
527 | ||
528 | err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); | |
529 | ||
530 | err |= copy_in_user((u64 __user *)sf, | |
531 | (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS), | |
532 | sizeof(struct reg_window)); | |
533 | ||
534 | if (info) | |
535 | err |= copy_siginfo_to_user(&sf->info, info); | |
536 | else { | |
537 | err |= __put_user(signo, &sf->info.si_signo); | |
538 | err |= __put_user(SI_NOINFO, &sf->info.si_code); | |
539 | } | |
540 | if (err) | |
541 | goto sigsegv; | |
542 | ||
543 | /* 3. signal handler back-trampoline and parameters */ | |
544 | regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; | |
545 | regs->u_regs[UREG_I0] = signo; | |
546 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
547 | ||
548 | /* The sigcontext is passed in this way because of how it | |
549 | * is defined in GLIBC's /usr/include/bits/sigcontext.h | |
550 | * for sparc64. It includes the 128 bytes of siginfo_t. | |
551 | */ | |
552 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
553 | ||
554 | /* 5. signal handler */ | |
555 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
556 | regs->tnpc = (regs->tpc + 4); | |
557 | if (test_thread_flag(TIF_32BIT)) { | |
558 | regs->tpc &= 0xffffffff; | |
559 | regs->tnpc &= 0xffffffff; | |
560 | } | |
561 | /* 4. return to kernel instructions */ | |
562 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
563 | return; | |
564 | ||
565 | sigill: | |
566 | do_exit(SIGILL); | |
567 | sigsegv: | |
568 | force_sigsegv(signo, current); | |
569 | } | |
570 | ||
571 | static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, | |
572 | siginfo_t *info, | |
573 | sigset_t *oldset, struct pt_regs *regs) | |
574 | { | |
575 | setup_rt_frame(ka, regs, signr, oldset, | |
576 | (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); | |
69be8f18 SR |
577 | spin_lock_irq(¤t->sighand->siglock); |
578 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
579 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 580 | sigaddset(¤t->blocked,signr); |
69be8f18 SR |
581 | recalc_sigpending(); |
582 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
583 | } |
584 | ||
585 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
586 | struct sigaction *sa) | |
587 | { | |
588 | switch (regs->u_regs[UREG_I0]) { | |
589 | case ERESTART_RESTARTBLOCK: | |
590 | case ERESTARTNOHAND: | |
591 | no_system_call_restart: | |
592 | regs->u_regs[UREG_I0] = EINTR; | |
593 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
594 | break; | |
595 | case ERESTARTSYS: | |
596 | if (!(sa->sa_flags & SA_RESTART)) | |
597 | goto no_system_call_restart; | |
598 | /* fallthrough */ | |
599 | case ERESTARTNOINTR: | |
600 | regs->u_regs[UREG_I0] = orig_i0; | |
601 | regs->tpc -= 4; | |
602 | regs->tnpc -= 4; | |
603 | } | |
604 | } | |
605 | ||
606 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
607 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
608 | * mistake. | |
609 | */ | |
610 | static int do_signal(sigset_t *oldset, struct pt_regs * regs, | |
611 | unsigned long orig_i0, int restart_syscall) | |
612 | { | |
613 | siginfo_t info; | |
614 | struct signal_deliver_cookie cookie; | |
615 | struct k_sigaction ka; | |
616 | int signr; | |
617 | ||
618 | cookie.restart_syscall = restart_syscall; | |
619 | cookie.orig_i0 = orig_i0; | |
620 | ||
621 | if (!oldset) | |
622 | oldset = ¤t->blocked; | |
623 | ||
624 | #ifdef CONFIG_SPARC32_COMPAT | |
625 | if (test_thread_flag(TIF_32BIT)) { | |
626 | extern int do_signal32(sigset_t *, struct pt_regs *, | |
627 | unsigned long, int); | |
628 | return do_signal32(oldset, regs, orig_i0, | |
629 | cookie.restart_syscall); | |
630 | } | |
631 | #endif | |
632 | ||
633 | signr = get_signal_to_deliver(&info, &ka, regs, &cookie); | |
634 | if (signr > 0) { | |
635 | if (cookie.restart_syscall) | |
636 | syscall_restart(orig_i0, regs, &ka.sa); | |
637 | handle_signal(signr, &ka, &info, oldset, regs); | |
638 | return 1; | |
639 | } | |
640 | if (cookie.restart_syscall && | |
641 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
642 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
643 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
644 | /* replay the system call when we are done */ | |
645 | regs->u_regs[UREG_I0] = cookie.orig_i0; | |
646 | regs->tpc -= 4; | |
647 | regs->tnpc -= 4; | |
648 | } | |
649 | if (cookie.restart_syscall && | |
650 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
651 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
652 | regs->tpc -= 4; | |
653 | regs->tnpc -= 4; | |
654 | } | |
655 | return 0; | |
656 | } | |
657 | ||
658 | void do_notify_resume(sigset_t *oldset, struct pt_regs *regs, | |
659 | unsigned long orig_i0, int restart_syscall, | |
660 | unsigned long thread_info_flags) | |
661 | { | |
662 | if (thread_info_flags & _TIF_SIGPENDING) | |
663 | do_signal(oldset, regs, orig_i0, restart_syscall); | |
664 | } | |
665 | ||
666 | void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) | |
667 | { | |
668 | struct signal_deliver_cookie *cp = cookie; | |
669 | ||
670 | if (cp->restart_syscall && | |
671 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
672 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
673 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
674 | /* replay the system call when we are done */ | |
675 | regs->u_regs[UREG_I0] = cp->orig_i0; | |
676 | regs->tpc -= 4; | |
677 | regs->tnpc -= 4; | |
678 | cp->restart_syscall = 0; | |
679 | } | |
680 | if (cp->restart_syscall && | |
681 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
682 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
683 | regs->tpc -= 4; | |
684 | regs->tnpc -= 4; | |
685 | cp->restart_syscall = 0; | |
686 | } | |
687 | } |