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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 | ||
1da177e4 LT |
11 | #ifdef CONFIG_SPARC32_COMPAT |
12 | #include <linux/compat.h> /* for compat_old_sigset_t */ | |
13 | #endif | |
14 | #include <linux/sched.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/signal.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/wait.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/unistd.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/tty.h> | |
1da177e4 LT |
23 | #include <linux/binfmts.h> |
24 | #include <linux/bitops.h> | |
25 | ||
26 | #include <asm/uaccess.h> | |
27 | #include <asm/ptrace.h> | |
28 | #include <asm/svr4.h> | |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/fpumacro.h> | |
31 | #include <asm/uctx.h> | |
32 | #include <asm/siginfo.h> | |
33 | #include <asm/visasm.h> | |
34 | ||
35 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
36 | ||
1da177e4 LT |
37 | /* {set, get}context() needed for 64-bit SparcLinux userland. */ |
38 | asmlinkage void sparc64_set_context(struct pt_regs *regs) | |
39 | { | |
40 | struct ucontext __user *ucp = (struct ucontext __user *) | |
41 | regs->u_regs[UREG_I0]; | |
42 | mc_gregset_t __user *grp; | |
43 | unsigned long pc, npc, tstate; | |
44 | unsigned long fp, i7; | |
45 | unsigned char fenab; | |
46 | int err; | |
47 | ||
48 | flush_user_windows(); | |
49 | if (get_thread_wsaved() || | |
50 | (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || | |
51 | (!__access_ok(ucp, sizeof(*ucp)))) | |
52 | goto do_sigsegv; | |
53 | grp = &ucp->uc_mcontext.mc_gregs; | |
54 | err = __get_user(pc, &((*grp)[MC_PC])); | |
55 | err |= __get_user(npc, &((*grp)[MC_NPC])); | |
56 | if (err || ((pc | npc) & 3)) | |
57 | goto do_sigsegv; | |
58 | if (regs->u_regs[UREG_I1]) { | |
59 | sigset_t set; | |
60 | ||
61 | if (_NSIG_WORDS == 1) { | |
62 | if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) | |
63 | goto do_sigsegv; | |
64 | } else { | |
65 | if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) | |
66 | goto do_sigsegv; | |
67 | } | |
68 | sigdelsetmask(&set, ~_BLOCKABLE); | |
69 | spin_lock_irq(¤t->sighand->siglock); | |
70 | current->blocked = set; | |
71 | recalc_sigpending(); | |
72 | spin_unlock_irq(¤t->sighand->siglock); | |
73 | } | |
74 | if (test_thread_flag(TIF_32BIT)) { | |
75 | pc &= 0xffffffff; | |
76 | npc &= 0xffffffff; | |
77 | } | |
78 | regs->tpc = pc; | |
79 | regs->tnpc = npc; | |
80 | err |= __get_user(regs->y, &((*grp)[MC_Y])); | |
81 | err |= __get_user(tstate, &((*grp)[MC_TSTATE])); | |
82 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); | |
83 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); | |
84 | err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); | |
85 | err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); | |
86 | err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); | |
87 | err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); | |
88 | err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); | |
89 | err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); | |
90 | err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7])); | |
91 | err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); | |
92 | err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); | |
93 | err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); | |
94 | err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); | |
95 | err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); | |
96 | err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); | |
97 | err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); | |
98 | err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); | |
99 | ||
100 | err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); | |
101 | err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); | |
102 | err |= __put_user(fp, | |
103 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); | |
104 | err |= __put_user(i7, | |
105 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); | |
106 | ||
107 | err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); | |
108 | if (fenab) { | |
109 | unsigned long *fpregs = current_thread_info()->fpregs; | |
110 | unsigned long fprs; | |
111 | ||
112 | fprs_write(0); | |
113 | err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); | |
114 | if (fprs & FPRS_DL) | |
115 | err |= copy_from_user(fpregs, | |
116 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), | |
117 | (sizeof(unsigned int) * 32)); | |
118 | if (fprs & FPRS_DU) | |
119 | err |= copy_from_user(fpregs+16, | |
120 | ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, | |
121 | (sizeof(unsigned int) * 32)); | |
122 | err |= __get_user(current_thread_info()->xfsr[0], | |
123 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); | |
124 | err |= __get_user(current_thread_info()->gsr[0], | |
125 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); | |
126 | regs->tstate &= ~TSTATE_PEF; | |
127 | } | |
128 | if (err) | |
129 | goto do_sigsegv; | |
130 | ||
131 | return; | |
132 | do_sigsegv: | |
133 | force_sig(SIGSEGV, current); | |
134 | } | |
135 | ||
136 | asmlinkage void sparc64_get_context(struct pt_regs *regs) | |
137 | { | |
138 | struct ucontext __user *ucp = (struct ucontext __user *) | |
139 | regs->u_regs[UREG_I0]; | |
140 | mc_gregset_t __user *grp; | |
141 | mcontext_t __user *mcp; | |
142 | unsigned long fp, i7; | |
143 | unsigned char fenab; | |
144 | int err; | |
145 | ||
146 | synchronize_user_stack(); | |
147 | if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) | |
148 | goto do_sigsegv; | |
149 | ||
150 | #if 1 | |
151 | fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ | |
152 | #else | |
153 | fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); | |
154 | #endif | |
155 | ||
156 | mcp = &ucp->uc_mcontext; | |
157 | grp = &mcp->mc_gregs; | |
158 | ||
159 | /* Skip over the trap instruction, first. */ | |
160 | if (test_thread_flag(TIF_32BIT)) { | |
161 | regs->tpc = (regs->tnpc & 0xffffffff); | |
162 | regs->tnpc = (regs->tnpc + 4) & 0xffffffff; | |
163 | } else { | |
164 | regs->tpc = regs->tnpc; | |
165 | regs->tnpc += 4; | |
166 | } | |
167 | err = 0; | |
168 | if (_NSIG_WORDS == 1) | |
169 | err |= __put_user(current->blocked.sig[0], | |
170 | (unsigned long __user *)&ucp->uc_sigmask); | |
171 | else | |
172 | err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, | |
173 | sizeof(sigset_t)); | |
174 | ||
175 | err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); | |
176 | err |= __put_user(regs->tpc, &((*grp)[MC_PC])); | |
177 | err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); | |
178 | err |= __put_user(regs->y, &((*grp)[MC_Y])); | |
179 | err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); | |
180 | err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); | |
181 | err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); | |
182 | err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); | |
183 | err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); | |
184 | err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); | |
185 | err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); | |
186 | err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); | |
187 | err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); | |
188 | err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); | |
189 | err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); | |
190 | err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); | |
191 | err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); | |
192 | err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); | |
193 | err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); | |
194 | ||
195 | err |= __get_user(fp, | |
196 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); | |
197 | err |= __get_user(i7, | |
198 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); | |
199 | err |= __put_user(fp, &(mcp->mc_fp)); | |
200 | err |= __put_user(i7, &(mcp->mc_i7)); | |
201 | ||
202 | err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); | |
203 | if (fenab) { | |
204 | unsigned long *fpregs = current_thread_info()->fpregs; | |
205 | unsigned long fprs; | |
206 | ||
207 | fprs = current_thread_info()->fpsaved[0]; | |
208 | if (fprs & FPRS_DL) | |
209 | err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, | |
210 | (sizeof(unsigned int) * 32)); | |
211 | if (fprs & FPRS_DU) | |
212 | err |= copy_to_user( | |
213 | ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, | |
214 | (sizeof(unsigned int) * 32)); | |
215 | err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); | |
216 | err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); | |
217 | err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); | |
218 | } | |
219 | if (err) | |
220 | goto do_sigsegv; | |
221 | ||
222 | return; | |
223 | do_sigsegv: | |
224 | force_sig(SIGSEGV, current); | |
225 | } | |
226 | ||
227 | struct rt_signal_frame { | |
228 | struct sparc_stackf ss; | |
229 | siginfo_t info; | |
230 | struct pt_regs regs; | |
231 | __siginfo_fpu_t __user *fpu_save; | |
232 | stack_t stack; | |
233 | sigset_t mask; | |
234 | __siginfo_fpu_t fpu_state; | |
235 | }; | |
236 | ||
237 | /* Align macros */ | |
238 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) | |
239 | ||
2d7d5f05 | 240 | static long _sigpause_common(old_sigset_t set) |
1da177e4 | 241 | { |
1da177e4 LT |
242 | set &= _BLOCKABLE; |
243 | spin_lock_irq(¤t->sighand->siglock); | |
2d7d5f05 | 244 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
245 | siginitset(¤t->blocked, set); |
246 | recalc_sigpending(); | |
247 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 | 248 | |
2d7d5f05 DM |
249 | current->state = TASK_INTERRUPTIBLE; |
250 | schedule(); | |
251 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
252 | return -ERESTARTNOHAND; | |
1da177e4 LT |
253 | } |
254 | ||
2d7d5f05 | 255 | asmlinkage long sys_sigpause(unsigned int set) |
1da177e4 | 256 | { |
2d7d5f05 | 257 | return _sigpause_common(set); |
1da177e4 LT |
258 | } |
259 | ||
2d7d5f05 | 260 | asmlinkage long sys_sigsuspend(old_sigset_t set) |
1da177e4 | 261 | { |
2d7d5f05 | 262 | return _sigpause_common(set); |
1da177e4 LT |
263 | } |
264 | ||
265 | static inline int | |
266 | restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
267 | { | |
268 | unsigned long *fpregs = current_thread_info()->fpregs; | |
269 | unsigned long fprs; | |
270 | int err; | |
271 | ||
272 | err = __get_user(fprs, &fpu->si_fprs); | |
273 | fprs_write(0); | |
274 | regs->tstate &= ~TSTATE_PEF; | |
275 | if (fprs & FPRS_DL) | |
276 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], | |
277 | (sizeof(unsigned int) * 32)); | |
278 | if (fprs & FPRS_DU) | |
279 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], | |
280 | (sizeof(unsigned int) * 32)); | |
281 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
282 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
283 | current_thread_info()->fpsaved[0] |= fprs; | |
284 | return err; | |
285 | } | |
286 | ||
287 | void do_rt_sigreturn(struct pt_regs *regs) | |
288 | { | |
289 | struct rt_signal_frame __user *sf; | |
290 | unsigned long tpc, tnpc, tstate; | |
291 | __siginfo_fpu_t __user *fpu_save; | |
292 | mm_segment_t old_fs; | |
293 | sigset_t set; | |
294 | stack_t st; | |
295 | int err; | |
296 | ||
297 | /* Always make any pending restarted system calls return -EINTR */ | |
298 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
299 | ||
300 | synchronize_user_stack (); | |
301 | sf = (struct rt_signal_frame __user *) | |
302 | (regs->u_regs [UREG_FP] + STACK_BIAS); | |
303 | ||
304 | /* 1. Make sure we are not getting garbage from the user */ | |
305 | if (((unsigned long) sf) & 3) | |
306 | goto segv; | |
307 | ||
308 | err = get_user(tpc, &sf->regs.tpc); | |
309 | err |= __get_user(tnpc, &sf->regs.tnpc); | |
310 | if (test_thread_flag(TIF_32BIT)) { | |
311 | tpc &= 0xffffffff; | |
312 | tnpc &= 0xffffffff; | |
313 | } | |
314 | err |= ((tpc | tnpc) & 3); | |
315 | ||
316 | /* 2. Restore the state */ | |
317 | err |= __get_user(regs->y, &sf->regs.y); | |
318 | err |= __get_user(tstate, &sf->regs.tstate); | |
319 | err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); | |
320 | ||
321 | /* User can only change condition codes and %asi in %tstate. */ | |
322 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); | |
323 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); | |
324 | ||
325 | err |= __get_user(fpu_save, &sf->fpu_save); | |
326 | if (fpu_save) | |
327 | err |= restore_fpu_state(regs, &sf->fpu_state); | |
328 | ||
329 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); | |
330 | err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); | |
331 | ||
332 | if (err) | |
333 | goto segv; | |
334 | ||
335 | regs->tpc = tpc; | |
336 | regs->tnpc = tnpc; | |
337 | ||
338 | /* It is more difficult to avoid calling this function than to | |
339 | call it and ignore errors. */ | |
340 | old_fs = get_fs(); | |
341 | set_fs(KERNEL_DS); | |
342 | do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); | |
343 | set_fs(old_fs); | |
344 | ||
345 | sigdelsetmask(&set, ~_BLOCKABLE); | |
346 | spin_lock_irq(¤t->sighand->siglock); | |
347 | current->blocked = set; | |
348 | recalc_sigpending(); | |
349 | spin_unlock_irq(¤t->sighand->siglock); | |
350 | return; | |
351 | segv: | |
352 | force_sig(SIGSEGV, current); | |
353 | } | |
354 | ||
355 | /* Checks if the fp is valid */ | |
356 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
357 | { | |
358 | if (((unsigned long) fp) & 7) | |
359 | return 1; | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static inline int | |
364 | save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
365 | { | |
366 | unsigned long *fpregs = (unsigned long *)(regs+1); | |
367 | unsigned long fprs; | |
368 | int err = 0; | |
369 | ||
370 | fprs = current_thread_info()->fpsaved[0]; | |
371 | if (fprs & FPRS_DL) | |
372 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
373 | (sizeof(unsigned int) * 32)); | |
374 | if (fprs & FPRS_DU) | |
375 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
376 | (sizeof(unsigned int) * 32)); | |
377 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
378 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
379 | err |= __put_user(fprs, &fpu->si_fprs); | |
380 | ||
381 | return err; | |
382 | } | |
383 | ||
384 | static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) | |
385 | { | |
386 | unsigned long sp; | |
387 | ||
388 | sp = regs->u_regs[UREG_FP] + STACK_BIAS; | |
389 | ||
390 | /* This is the X/Open sanctioned signal stack switching. */ | |
391 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
392 | if (!on_sig_stack(sp) && | |
393 | !((current->sas_ss_sp + current->sas_ss_size) & 7)) | |
394 | sp = current->sas_ss_sp + current->sas_ss_size; | |
395 | } | |
396 | return (void __user *)(sp - framesize); | |
397 | } | |
398 | ||
399 | static inline void | |
400 | setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
401 | int signo, sigset_t *oldset, siginfo_t *info) | |
402 | { | |
403 | struct rt_signal_frame __user *sf; | |
404 | int sigframe_size, err; | |
405 | ||
406 | /* 1. Make sure everything is clean */ | |
407 | synchronize_user_stack(); | |
408 | save_and_clear_fpu(); | |
409 | ||
410 | sigframe_size = RT_ALIGNEDSZ; | |
411 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) | |
412 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
413 | ||
414 | sf = (struct rt_signal_frame __user *) | |
415 | get_sigframe(ka, regs, sigframe_size); | |
416 | ||
417 | if (invalid_frame_pointer (sf, sigframe_size)) | |
418 | goto sigill; | |
419 | ||
420 | if (get_thread_wsaved() != 0) | |
421 | goto sigill; | |
422 | ||
423 | /* 2. Save the current process state */ | |
424 | err = copy_to_user(&sf->regs, regs, sizeof (*regs)); | |
425 | ||
426 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) { | |
427 | err |= save_fpu_state(regs, &sf->fpu_state); | |
428 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
429 | } else { | |
430 | err |= __put_user(0, &sf->fpu_save); | |
431 | } | |
432 | ||
433 | /* Setup sigaltstack */ | |
434 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
435 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
436 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
437 | ||
438 | err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); | |
439 | ||
440 | err |= copy_in_user((u64 __user *)sf, | |
441 | (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS), | |
442 | sizeof(struct reg_window)); | |
443 | ||
444 | if (info) | |
445 | err |= copy_siginfo_to_user(&sf->info, info); | |
446 | else { | |
447 | err |= __put_user(signo, &sf->info.si_signo); | |
448 | err |= __put_user(SI_NOINFO, &sf->info.si_code); | |
449 | } | |
450 | if (err) | |
451 | goto sigsegv; | |
452 | ||
453 | /* 3. signal handler back-trampoline and parameters */ | |
454 | regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; | |
455 | regs->u_regs[UREG_I0] = signo; | |
456 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
457 | ||
458 | /* The sigcontext is passed in this way because of how it | |
459 | * is defined in GLIBC's /usr/include/bits/sigcontext.h | |
460 | * for sparc64. It includes the 128 bytes of siginfo_t. | |
461 | */ | |
462 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
463 | ||
464 | /* 5. signal handler */ | |
465 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
466 | regs->tnpc = (regs->tpc + 4); | |
467 | if (test_thread_flag(TIF_32BIT)) { | |
468 | regs->tpc &= 0xffffffff; | |
469 | regs->tnpc &= 0xffffffff; | |
470 | } | |
471 | /* 4. return to kernel instructions */ | |
472 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
473 | return; | |
474 | ||
475 | sigill: | |
476 | do_exit(SIGILL); | |
477 | sigsegv: | |
478 | force_sigsegv(signo, current); | |
479 | } | |
480 | ||
481 | static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, | |
482 | siginfo_t *info, | |
483 | sigset_t *oldset, struct pt_regs *regs) | |
484 | { | |
485 | setup_rt_frame(ka, regs, signr, oldset, | |
486 | (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); | |
69be8f18 SR |
487 | spin_lock_irq(¤t->sighand->siglock); |
488 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
489 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 490 | sigaddset(¤t->blocked,signr); |
69be8f18 SR |
491 | recalc_sigpending(); |
492 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
493 | } |
494 | ||
495 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
496 | struct sigaction *sa) | |
497 | { | |
498 | switch (regs->u_regs[UREG_I0]) { | |
499 | case ERESTART_RESTARTBLOCK: | |
500 | case ERESTARTNOHAND: | |
501 | no_system_call_restart: | |
502 | regs->u_regs[UREG_I0] = EINTR; | |
503 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
504 | break; | |
505 | case ERESTARTSYS: | |
506 | if (!(sa->sa_flags & SA_RESTART)) | |
507 | goto no_system_call_restart; | |
508 | /* fallthrough */ | |
509 | case ERESTARTNOINTR: | |
510 | regs->u_regs[UREG_I0] = orig_i0; | |
511 | regs->tpc -= 4; | |
512 | regs->tnpc -= 4; | |
513 | } | |
514 | } | |
515 | ||
516 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
517 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
518 | * mistake. | |
519 | */ | |
2d7d5f05 | 520 | static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall) |
1da177e4 LT |
521 | { |
522 | siginfo_t info; | |
523 | struct signal_deliver_cookie cookie; | |
524 | struct k_sigaction ka; | |
525 | int signr; | |
2d7d5f05 | 526 | sigset_t *oldset; |
1da177e4 LT |
527 | |
528 | cookie.restart_syscall = restart_syscall; | |
529 | cookie.orig_i0 = orig_i0; | |
530 | ||
2d7d5f05 DM |
531 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
532 | oldset = ¤t->saved_sigmask; | |
533 | else | |
1da177e4 LT |
534 | oldset = ¤t->blocked; |
535 | ||
536 | #ifdef CONFIG_SPARC32_COMPAT | |
537 | if (test_thread_flag(TIF_32BIT)) { | |
2d7d5f05 DM |
538 | extern void do_signal32(sigset_t *, struct pt_regs *, |
539 | unsigned long, int); | |
540 | do_signal32(oldset, regs, orig_i0, | |
541 | cookie.restart_syscall); | |
542 | return; | |
1da177e4 LT |
543 | } |
544 | #endif | |
545 | ||
546 | signr = get_signal_to_deliver(&info, &ka, regs, &cookie); | |
547 | if (signr > 0) { | |
548 | if (cookie.restart_syscall) | |
549 | syscall_restart(orig_i0, regs, &ka.sa); | |
550 | handle_signal(signr, &ka, &info, oldset, regs); | |
2d7d5f05 DM |
551 | |
552 | /* a signal was successfully delivered; the saved | |
553 | * sigmask will have been stored in the signal frame, | |
554 | * and will be restored by sigreturn, so we can simply | |
555 | * clear the TIF_RESTORE_SIGMASK flag. | |
556 | */ | |
557 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
558 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
559 | return; | |
1da177e4 LT |
560 | } |
561 | if (cookie.restart_syscall && | |
562 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
563 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
564 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
565 | /* replay the system call when we are done */ | |
566 | regs->u_regs[UREG_I0] = cookie.orig_i0; | |
567 | regs->tpc -= 4; | |
568 | regs->tnpc -= 4; | |
569 | } | |
570 | if (cookie.restart_syscall && | |
571 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
572 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
573 | regs->tpc -= 4; | |
574 | regs->tnpc -= 4; | |
575 | } | |
2d7d5f05 DM |
576 | |
577 | /* if there's no signal to deliver, we just put the saved sigmask | |
578 | * back | |
579 | */ | |
580 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
581 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
582 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
583 | } | |
1da177e4 LT |
584 | } |
585 | ||
2d7d5f05 | 586 | void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall, |
1da177e4 LT |
587 | unsigned long thread_info_flags) |
588 | { | |
2d7d5f05 DM |
589 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
590 | do_signal(regs, orig_i0, restart_syscall); | |
1da177e4 LT |
591 | } |
592 | ||
593 | void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) | |
594 | { | |
595 | struct signal_deliver_cookie *cp = cookie; | |
596 | ||
597 | if (cp->restart_syscall && | |
598 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
599 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
600 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
601 | /* replay the system call when we are done */ | |
602 | regs->u_regs[UREG_I0] = cp->orig_i0; | |
603 | regs->tpc -= 4; | |
604 | regs->tnpc -= 4; | |
605 | cp->restart_syscall = 0; | |
606 | } | |
607 | if (cp->restart_syscall && | |
608 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
609 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
610 | regs->tpc -= 4; | |
611 | regs->tnpc -= 4; | |
612 | cp->restart_syscall = 0; | |
613 | } | |
614 | } |