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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 | ||
1da177e4 LT |
39 | /* {set, get}context() needed for 64-bit SparcLinux userland. */ |
40 | asmlinkage void sparc64_set_context(struct pt_regs *regs) | |
41 | { | |
42 | struct ucontext __user *ucp = (struct ucontext __user *) | |
43 | regs->u_regs[UREG_I0]; | |
44 | mc_gregset_t __user *grp; | |
45 | unsigned long pc, npc, tstate; | |
46 | unsigned long fp, i7; | |
47 | unsigned char fenab; | |
48 | int err; | |
49 | ||
50 | flush_user_windows(); | |
51 | if (get_thread_wsaved() || | |
52 | (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || | |
53 | (!__access_ok(ucp, sizeof(*ucp)))) | |
54 | goto do_sigsegv; | |
55 | grp = &ucp->uc_mcontext.mc_gregs; | |
56 | err = __get_user(pc, &((*grp)[MC_PC])); | |
57 | err |= __get_user(npc, &((*grp)[MC_NPC])); | |
58 | if (err || ((pc | npc) & 3)) | |
59 | goto do_sigsegv; | |
60 | if (regs->u_regs[UREG_I1]) { | |
61 | sigset_t set; | |
62 | ||
63 | if (_NSIG_WORDS == 1) { | |
64 | if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) | |
65 | goto do_sigsegv; | |
66 | } else { | |
67 | if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) | |
68 | goto do_sigsegv; | |
69 | } | |
70 | sigdelsetmask(&set, ~_BLOCKABLE); | |
71 | spin_lock_irq(¤t->sighand->siglock); | |
72 | current->blocked = set; | |
73 | recalc_sigpending(); | |
74 | spin_unlock_irq(¤t->sighand->siglock); | |
75 | } | |
76 | if (test_thread_flag(TIF_32BIT)) { | |
77 | pc &= 0xffffffff; | |
78 | npc &= 0xffffffff; | |
79 | } | |
80 | regs->tpc = pc; | |
81 | regs->tnpc = npc; | |
82 | err |= __get_user(regs->y, &((*grp)[MC_Y])); | |
83 | err |= __get_user(tstate, &((*grp)[MC_TSTATE])); | |
84 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); | |
85 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); | |
86 | err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); | |
87 | err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); | |
88 | err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); | |
89 | err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); | |
90 | err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); | |
91 | err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); | |
92 | err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7])); | |
93 | err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); | |
94 | err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); | |
95 | err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); | |
96 | err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); | |
97 | err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); | |
98 | err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); | |
99 | err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); | |
100 | err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); | |
101 | ||
102 | err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); | |
103 | err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); | |
104 | err |= __put_user(fp, | |
105 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); | |
106 | err |= __put_user(i7, | |
107 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); | |
108 | ||
109 | err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); | |
110 | if (fenab) { | |
111 | unsigned long *fpregs = current_thread_info()->fpregs; | |
112 | unsigned long fprs; | |
113 | ||
114 | fprs_write(0); | |
115 | err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); | |
116 | if (fprs & FPRS_DL) | |
117 | err |= copy_from_user(fpregs, | |
118 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), | |
119 | (sizeof(unsigned int) * 32)); | |
120 | if (fprs & FPRS_DU) | |
121 | err |= copy_from_user(fpregs+16, | |
122 | ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, | |
123 | (sizeof(unsigned int) * 32)); | |
124 | err |= __get_user(current_thread_info()->xfsr[0], | |
125 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); | |
126 | err |= __get_user(current_thread_info()->gsr[0], | |
127 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); | |
128 | regs->tstate &= ~TSTATE_PEF; | |
129 | } | |
130 | if (err) | |
131 | goto do_sigsegv; | |
132 | ||
133 | return; | |
134 | do_sigsegv: | |
135 | force_sig(SIGSEGV, current); | |
136 | } | |
137 | ||
138 | asmlinkage void sparc64_get_context(struct pt_regs *regs) | |
139 | { | |
140 | struct ucontext __user *ucp = (struct ucontext __user *) | |
141 | regs->u_regs[UREG_I0]; | |
142 | mc_gregset_t __user *grp; | |
143 | mcontext_t __user *mcp; | |
144 | unsigned long fp, i7; | |
145 | unsigned char fenab; | |
146 | int err; | |
147 | ||
148 | synchronize_user_stack(); | |
149 | if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) | |
150 | goto do_sigsegv; | |
151 | ||
152 | #if 1 | |
153 | fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ | |
154 | #else | |
155 | fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); | |
156 | #endif | |
157 | ||
158 | mcp = &ucp->uc_mcontext; | |
159 | grp = &mcp->mc_gregs; | |
160 | ||
161 | /* Skip over the trap instruction, first. */ | |
162 | if (test_thread_flag(TIF_32BIT)) { | |
163 | regs->tpc = (regs->tnpc & 0xffffffff); | |
164 | regs->tnpc = (regs->tnpc + 4) & 0xffffffff; | |
165 | } else { | |
166 | regs->tpc = regs->tnpc; | |
167 | regs->tnpc += 4; | |
168 | } | |
169 | err = 0; | |
170 | if (_NSIG_WORDS == 1) | |
171 | err |= __put_user(current->blocked.sig[0], | |
172 | (unsigned long __user *)&ucp->uc_sigmask); | |
173 | else | |
174 | err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, | |
175 | sizeof(sigset_t)); | |
176 | ||
177 | err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); | |
178 | err |= __put_user(regs->tpc, &((*grp)[MC_PC])); | |
179 | err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); | |
180 | err |= __put_user(regs->y, &((*grp)[MC_Y])); | |
181 | err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); | |
182 | err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); | |
183 | err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); | |
184 | err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); | |
185 | err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); | |
186 | err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); | |
187 | err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); | |
188 | err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); | |
189 | err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); | |
190 | err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); | |
191 | err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); | |
192 | err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); | |
193 | err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); | |
194 | err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); | |
195 | err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); | |
196 | ||
197 | err |= __get_user(fp, | |
198 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); | |
199 | err |= __get_user(i7, | |
200 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); | |
201 | err |= __put_user(fp, &(mcp->mc_fp)); | |
202 | err |= __put_user(i7, &(mcp->mc_i7)); | |
203 | ||
204 | err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); | |
205 | if (fenab) { | |
206 | unsigned long *fpregs = current_thread_info()->fpregs; | |
207 | unsigned long fprs; | |
208 | ||
209 | fprs = current_thread_info()->fpsaved[0]; | |
210 | if (fprs & FPRS_DL) | |
211 | err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, | |
212 | (sizeof(unsigned int) * 32)); | |
213 | if (fprs & FPRS_DU) | |
214 | err |= copy_to_user( | |
215 | ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, | |
216 | (sizeof(unsigned int) * 32)); | |
217 | err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); | |
218 | err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); | |
219 | err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); | |
220 | } | |
221 | if (err) | |
222 | goto do_sigsegv; | |
223 | ||
224 | return; | |
225 | do_sigsegv: | |
226 | force_sig(SIGSEGV, current); | |
227 | } | |
228 | ||
229 | struct rt_signal_frame { | |
230 | struct sparc_stackf ss; | |
231 | siginfo_t info; | |
232 | struct pt_regs regs; | |
233 | __siginfo_fpu_t __user *fpu_save; | |
234 | stack_t stack; | |
235 | sigset_t mask; | |
236 | __siginfo_fpu_t fpu_state; | |
237 | }; | |
238 | ||
239 | /* Align macros */ | |
240 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) | |
241 | ||
2d7d5f05 | 242 | static long _sigpause_common(old_sigset_t set) |
1da177e4 | 243 | { |
1da177e4 LT |
244 | set &= _BLOCKABLE; |
245 | spin_lock_irq(¤t->sighand->siglock); | |
2d7d5f05 | 246 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
247 | siginitset(¤t->blocked, set); |
248 | recalc_sigpending(); | |
249 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 | 250 | |
2d7d5f05 DM |
251 | current->state = TASK_INTERRUPTIBLE; |
252 | schedule(); | |
253 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
254 | return -ERESTARTNOHAND; | |
1da177e4 LT |
255 | } |
256 | ||
2d7d5f05 | 257 | asmlinkage long sys_sigpause(unsigned int set) |
1da177e4 | 258 | { |
2d7d5f05 | 259 | return _sigpause_common(set); |
1da177e4 LT |
260 | } |
261 | ||
2d7d5f05 | 262 | asmlinkage long sys_sigsuspend(old_sigset_t set) |
1da177e4 | 263 | { |
2d7d5f05 | 264 | return _sigpause_common(set); |
1da177e4 LT |
265 | } |
266 | ||
267 | static inline int | |
268 | restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
269 | { | |
270 | unsigned long *fpregs = current_thread_info()->fpregs; | |
271 | unsigned long fprs; | |
272 | int err; | |
273 | ||
274 | err = __get_user(fprs, &fpu->si_fprs); | |
275 | fprs_write(0); | |
276 | regs->tstate &= ~TSTATE_PEF; | |
277 | if (fprs & FPRS_DL) | |
278 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], | |
279 | (sizeof(unsigned int) * 32)); | |
280 | if (fprs & FPRS_DU) | |
281 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], | |
282 | (sizeof(unsigned int) * 32)); | |
283 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
284 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
285 | current_thread_info()->fpsaved[0] |= fprs; | |
286 | return err; | |
287 | } | |
288 | ||
289 | void do_rt_sigreturn(struct pt_regs *regs) | |
290 | { | |
291 | struct rt_signal_frame __user *sf; | |
292 | unsigned long tpc, tnpc, tstate; | |
293 | __siginfo_fpu_t __user *fpu_save; | |
294 | mm_segment_t old_fs; | |
295 | sigset_t set; | |
296 | stack_t st; | |
297 | int err; | |
298 | ||
299 | /* Always make any pending restarted system calls return -EINTR */ | |
300 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
301 | ||
302 | synchronize_user_stack (); | |
303 | sf = (struct rt_signal_frame __user *) | |
304 | (regs->u_regs [UREG_FP] + STACK_BIAS); | |
305 | ||
306 | /* 1. Make sure we are not getting garbage from the user */ | |
307 | if (((unsigned long) sf) & 3) | |
308 | goto segv; | |
309 | ||
310 | err = get_user(tpc, &sf->regs.tpc); | |
311 | err |= __get_user(tnpc, &sf->regs.tnpc); | |
312 | if (test_thread_flag(TIF_32BIT)) { | |
313 | tpc &= 0xffffffff; | |
314 | tnpc &= 0xffffffff; | |
315 | } | |
316 | err |= ((tpc | tnpc) & 3); | |
317 | ||
318 | /* 2. Restore the state */ | |
319 | err |= __get_user(regs->y, &sf->regs.y); | |
320 | err |= __get_user(tstate, &sf->regs.tstate); | |
321 | err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); | |
322 | ||
323 | /* User can only change condition codes and %asi in %tstate. */ | |
324 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); | |
325 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); | |
326 | ||
327 | err |= __get_user(fpu_save, &sf->fpu_save); | |
328 | if (fpu_save) | |
329 | err |= restore_fpu_state(regs, &sf->fpu_state); | |
330 | ||
331 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); | |
332 | err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); | |
333 | ||
334 | if (err) | |
335 | goto segv; | |
336 | ||
337 | regs->tpc = tpc; | |
338 | regs->tnpc = tnpc; | |
339 | ||
340 | /* It is more difficult to avoid calling this function than to | |
341 | call it and ignore errors. */ | |
342 | old_fs = get_fs(); | |
343 | set_fs(KERNEL_DS); | |
344 | do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); | |
345 | set_fs(old_fs); | |
346 | ||
347 | sigdelsetmask(&set, ~_BLOCKABLE); | |
348 | spin_lock_irq(¤t->sighand->siglock); | |
349 | current->blocked = set; | |
350 | recalc_sigpending(); | |
351 | spin_unlock_irq(¤t->sighand->siglock); | |
352 | return; | |
353 | segv: | |
354 | force_sig(SIGSEGV, current); | |
355 | } | |
356 | ||
357 | /* Checks if the fp is valid */ | |
358 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
359 | { | |
360 | if (((unsigned long) fp) & 7) | |
361 | return 1; | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static inline int | |
366 | save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
367 | { | |
368 | unsigned long *fpregs = (unsigned long *)(regs+1); | |
369 | unsigned long fprs; | |
370 | int err = 0; | |
371 | ||
372 | fprs = current_thread_info()->fpsaved[0]; | |
373 | if (fprs & FPRS_DL) | |
374 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
375 | (sizeof(unsigned int) * 32)); | |
376 | if (fprs & FPRS_DU) | |
377 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
378 | (sizeof(unsigned int) * 32)); | |
379 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
380 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
381 | err |= __put_user(fprs, &fpu->si_fprs); | |
382 | ||
383 | return err; | |
384 | } | |
385 | ||
386 | static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) | |
387 | { | |
388 | unsigned long sp; | |
389 | ||
390 | sp = regs->u_regs[UREG_FP] + STACK_BIAS; | |
391 | ||
392 | /* This is the X/Open sanctioned signal stack switching. */ | |
393 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
394 | if (!on_sig_stack(sp) && | |
395 | !((current->sas_ss_sp + current->sas_ss_size) & 7)) | |
396 | sp = current->sas_ss_sp + current->sas_ss_size; | |
397 | } | |
398 | return (void __user *)(sp - framesize); | |
399 | } | |
400 | ||
401 | static inline void | |
402 | setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
403 | int signo, sigset_t *oldset, siginfo_t *info) | |
404 | { | |
405 | struct rt_signal_frame __user *sf; | |
406 | int sigframe_size, err; | |
407 | ||
408 | /* 1. Make sure everything is clean */ | |
409 | synchronize_user_stack(); | |
410 | save_and_clear_fpu(); | |
411 | ||
412 | sigframe_size = RT_ALIGNEDSZ; | |
413 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) | |
414 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
415 | ||
416 | sf = (struct rt_signal_frame __user *) | |
417 | get_sigframe(ka, regs, sigframe_size); | |
418 | ||
419 | if (invalid_frame_pointer (sf, sigframe_size)) | |
420 | goto sigill; | |
421 | ||
422 | if (get_thread_wsaved() != 0) | |
423 | goto sigill; | |
424 | ||
425 | /* 2. Save the current process state */ | |
426 | err = copy_to_user(&sf->regs, regs, sizeof (*regs)); | |
427 | ||
428 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) { | |
429 | err |= save_fpu_state(regs, &sf->fpu_state); | |
430 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
431 | } else { | |
432 | err |= __put_user(0, &sf->fpu_save); | |
433 | } | |
434 | ||
435 | /* Setup sigaltstack */ | |
436 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
437 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
438 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
439 | ||
440 | err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); | |
441 | ||
442 | err |= copy_in_user((u64 __user *)sf, | |
443 | (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS), | |
444 | sizeof(struct reg_window)); | |
445 | ||
446 | if (info) | |
447 | err |= copy_siginfo_to_user(&sf->info, info); | |
448 | else { | |
449 | err |= __put_user(signo, &sf->info.si_signo); | |
450 | err |= __put_user(SI_NOINFO, &sf->info.si_code); | |
451 | } | |
452 | if (err) | |
453 | goto sigsegv; | |
454 | ||
455 | /* 3. signal handler back-trampoline and parameters */ | |
456 | regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; | |
457 | regs->u_regs[UREG_I0] = signo; | |
458 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
459 | ||
460 | /* The sigcontext is passed in this way because of how it | |
461 | * is defined in GLIBC's /usr/include/bits/sigcontext.h | |
462 | * for sparc64. It includes the 128 bytes of siginfo_t. | |
463 | */ | |
464 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
465 | ||
466 | /* 5. signal handler */ | |
467 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
468 | regs->tnpc = (regs->tpc + 4); | |
469 | if (test_thread_flag(TIF_32BIT)) { | |
470 | regs->tpc &= 0xffffffff; | |
471 | regs->tnpc &= 0xffffffff; | |
472 | } | |
473 | /* 4. return to kernel instructions */ | |
474 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
475 | return; | |
476 | ||
477 | sigill: | |
478 | do_exit(SIGILL); | |
479 | sigsegv: | |
480 | force_sigsegv(signo, current); | |
481 | } | |
482 | ||
483 | static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, | |
484 | siginfo_t *info, | |
485 | sigset_t *oldset, struct pt_regs *regs) | |
486 | { | |
487 | setup_rt_frame(ka, regs, signr, oldset, | |
488 | (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); | |
69be8f18 SR |
489 | spin_lock_irq(¤t->sighand->siglock); |
490 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
491 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 492 | sigaddset(¤t->blocked,signr); |
69be8f18 SR |
493 | recalc_sigpending(); |
494 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
495 | } |
496 | ||
497 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
498 | struct sigaction *sa) | |
499 | { | |
500 | switch (regs->u_regs[UREG_I0]) { | |
501 | case ERESTART_RESTARTBLOCK: | |
502 | case ERESTARTNOHAND: | |
503 | no_system_call_restart: | |
504 | regs->u_regs[UREG_I0] = EINTR; | |
505 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
506 | break; | |
507 | case ERESTARTSYS: | |
508 | if (!(sa->sa_flags & SA_RESTART)) | |
509 | goto no_system_call_restart; | |
510 | /* fallthrough */ | |
511 | case ERESTARTNOINTR: | |
512 | regs->u_regs[UREG_I0] = orig_i0; | |
513 | regs->tpc -= 4; | |
514 | regs->tnpc -= 4; | |
515 | } | |
516 | } | |
517 | ||
518 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
519 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
520 | * mistake. | |
521 | */ | |
2d7d5f05 | 522 | static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall) |
1da177e4 LT |
523 | { |
524 | siginfo_t info; | |
525 | struct signal_deliver_cookie cookie; | |
526 | struct k_sigaction ka; | |
527 | int signr; | |
2d7d5f05 | 528 | sigset_t *oldset; |
1da177e4 LT |
529 | |
530 | cookie.restart_syscall = restart_syscall; | |
531 | cookie.orig_i0 = orig_i0; | |
532 | ||
2d7d5f05 DM |
533 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
534 | oldset = ¤t->saved_sigmask; | |
535 | else | |
1da177e4 LT |
536 | oldset = ¤t->blocked; |
537 | ||
538 | #ifdef CONFIG_SPARC32_COMPAT | |
539 | if (test_thread_flag(TIF_32BIT)) { | |
2d7d5f05 DM |
540 | extern void do_signal32(sigset_t *, struct pt_regs *, |
541 | unsigned long, int); | |
542 | do_signal32(oldset, regs, orig_i0, | |
543 | cookie.restart_syscall); | |
544 | return; | |
1da177e4 LT |
545 | } |
546 | #endif | |
547 | ||
548 | signr = get_signal_to_deliver(&info, &ka, regs, &cookie); | |
549 | if (signr > 0) { | |
550 | if (cookie.restart_syscall) | |
551 | syscall_restart(orig_i0, regs, &ka.sa); | |
552 | handle_signal(signr, &ka, &info, oldset, regs); | |
2d7d5f05 DM |
553 | |
554 | /* a signal was successfully delivered; the saved | |
555 | * sigmask will have been stored in the signal frame, | |
556 | * and will be restored by sigreturn, so we can simply | |
557 | * clear the TIF_RESTORE_SIGMASK flag. | |
558 | */ | |
559 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
560 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
561 | return; | |
1da177e4 LT |
562 | } |
563 | if (cookie.restart_syscall && | |
564 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
565 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
566 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
567 | /* replay the system call when we are done */ | |
568 | regs->u_regs[UREG_I0] = cookie.orig_i0; | |
569 | regs->tpc -= 4; | |
570 | regs->tnpc -= 4; | |
571 | } | |
572 | if (cookie.restart_syscall && | |
573 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
574 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
575 | regs->tpc -= 4; | |
576 | regs->tnpc -= 4; | |
577 | } | |
2d7d5f05 DM |
578 | |
579 | /* if there's no signal to deliver, we just put the saved sigmask | |
580 | * back | |
581 | */ | |
582 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
583 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
584 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
585 | } | |
1da177e4 LT |
586 | } |
587 | ||
2d7d5f05 | 588 | void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall, |
1da177e4 LT |
589 | unsigned long thread_info_flags) |
590 | { | |
2d7d5f05 DM |
591 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
592 | do_signal(regs, orig_i0, restart_syscall); | |
1da177e4 LT |
593 | } |
594 | ||
595 | void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) | |
596 | { | |
597 | struct signal_deliver_cookie *cp = cookie; | |
598 | ||
599 | if (cp->restart_syscall && | |
600 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
601 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
602 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
603 | /* replay the system call when we are done */ | |
604 | regs->u_regs[UREG_I0] = cp->orig_i0; | |
605 | regs->tpc -= 4; | |
606 | regs->tnpc -= 4; | |
607 | cp->restart_syscall = 0; | |
608 | } | |
609 | if (cp->restart_syscall && | |
610 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
611 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
612 | regs->tpc -= 4; | |
613 | regs->tnpc -= 4; | |
614 | cp->restart_syscall = 0; | |
615 | } | |
616 | } |