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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> | |
1da177e4 LT |
28 | #include <asm/pgtable.h> |
29 | #include <asm/fpumacro.h> | |
30 | #include <asm/uctx.h> | |
31 | #include <asm/siginfo.h> | |
32 | #include <asm/visasm.h> | |
33 | ||
062ea6d3 DM |
34 | #include "entry.h" |
35 | #include "systbls.h" | |
36 | ||
1da177e4 LT |
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; | |
1da177e4 | 294 | sigset_t set; |
1da177e4 LT |
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)); | |
62715ec8 ON |
330 | err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf); |
331 | ||
1da177e4 LT |
332 | if (err) |
333 | goto segv; | |
62715ec8 | 334 | |
1da177e4 LT |
335 | regs->tpc = tpc; |
336 | regs->tnpc = tnpc; | |
1da177e4 LT |
337 | |
338 | sigdelsetmask(&set, ~_BLOCKABLE); | |
339 | spin_lock_irq(¤t->sighand->siglock); | |
340 | current->blocked = set; | |
341 | recalc_sigpending(); | |
342 | spin_unlock_irq(¤t->sighand->siglock); | |
343 | return; | |
344 | segv: | |
345 | force_sig(SIGSEGV, current); | |
346 | } | |
347 | ||
348 | /* Checks if the fp is valid */ | |
349 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
350 | { | |
351 | if (((unsigned long) fp) & 7) | |
352 | return 1; | |
353 | return 0; | |
354 | } | |
355 | ||
356 | static inline int | |
357 | save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
358 | { | |
7c3cce97 | 359 | unsigned long *fpregs = current_thread_info()->fpregs; |
1da177e4 LT |
360 | unsigned long fprs; |
361 | int err = 0; | |
362 | ||
363 | fprs = current_thread_info()->fpsaved[0]; | |
364 | if (fprs & FPRS_DL) | |
365 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
366 | (sizeof(unsigned int) * 32)); | |
367 | if (fprs & FPRS_DU) | |
368 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
369 | (sizeof(unsigned int) * 32)); | |
370 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
371 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
372 | err |= __put_user(fprs, &fpu->si_fprs); | |
373 | ||
374 | return err; | |
375 | } | |
376 | ||
377 | static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) | |
378 | { | |
379 | unsigned long sp; | |
380 | ||
381 | sp = regs->u_regs[UREG_FP] + STACK_BIAS; | |
382 | ||
383 | /* This is the X/Open sanctioned signal stack switching. */ | |
384 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
385 | if (!on_sig_stack(sp) && | |
386 | !((current->sas_ss_sp + current->sas_ss_size) & 7)) | |
387 | sp = current->sas_ss_sp + current->sas_ss_size; | |
388 | } | |
389 | return (void __user *)(sp - framesize); | |
390 | } | |
391 | ||
392 | static inline void | |
393 | setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
394 | int signo, sigset_t *oldset, siginfo_t *info) | |
395 | { | |
396 | struct rt_signal_frame __user *sf; | |
397 | int sigframe_size, err; | |
398 | ||
399 | /* 1. Make sure everything is clean */ | |
400 | synchronize_user_stack(); | |
401 | save_and_clear_fpu(); | |
402 | ||
403 | sigframe_size = RT_ALIGNEDSZ; | |
404 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) | |
405 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
406 | ||
407 | sf = (struct rt_signal_frame __user *) | |
408 | get_sigframe(ka, regs, sigframe_size); | |
409 | ||
410 | if (invalid_frame_pointer (sf, sigframe_size)) | |
411 | goto sigill; | |
412 | ||
413 | if (get_thread_wsaved() != 0) | |
414 | goto sigill; | |
415 | ||
416 | /* 2. Save the current process state */ | |
417 | err = copy_to_user(&sf->regs, regs, sizeof (*regs)); | |
418 | ||
419 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) { | |
420 | err |= save_fpu_state(regs, &sf->fpu_state); | |
421 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
422 | } else { | |
423 | err |= __put_user(0, &sf->fpu_save); | |
424 | } | |
425 | ||
426 | /* Setup sigaltstack */ | |
427 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
428 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
429 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
430 | ||
431 | err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); | |
432 | ||
433 | err |= copy_in_user((u64 __user *)sf, | |
434 | (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS), | |
435 | sizeof(struct reg_window)); | |
436 | ||
437 | if (info) | |
438 | err |= copy_siginfo_to_user(&sf->info, info); | |
439 | else { | |
440 | err |= __put_user(signo, &sf->info.si_signo); | |
441 | err |= __put_user(SI_NOINFO, &sf->info.si_code); | |
442 | } | |
443 | if (err) | |
444 | goto sigsegv; | |
445 | ||
446 | /* 3. signal handler back-trampoline and parameters */ | |
447 | regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; | |
448 | regs->u_regs[UREG_I0] = signo; | |
449 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
450 | ||
451 | /* The sigcontext is passed in this way because of how it | |
452 | * is defined in GLIBC's /usr/include/bits/sigcontext.h | |
453 | * for sparc64. It includes the 128 bytes of siginfo_t. | |
454 | */ | |
455 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
456 | ||
457 | /* 5. signal handler */ | |
458 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
459 | regs->tnpc = (regs->tpc + 4); | |
460 | if (test_thread_flag(TIF_32BIT)) { | |
461 | regs->tpc &= 0xffffffff; | |
462 | regs->tnpc &= 0xffffffff; | |
463 | } | |
464 | /* 4. return to kernel instructions */ | |
465 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
466 | return; | |
467 | ||
468 | sigill: | |
469 | do_exit(SIGILL); | |
470 | sigsegv: | |
471 | force_sigsegv(signo, current); | |
472 | } | |
473 | ||
474 | static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, | |
475 | siginfo_t *info, | |
476 | sigset_t *oldset, struct pt_regs *regs) | |
477 | { | |
478 | setup_rt_frame(ka, regs, signr, oldset, | |
479 | (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); | |
69be8f18 SR |
480 | spin_lock_irq(¤t->sighand->siglock); |
481 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
482 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 483 | sigaddset(¤t->blocked,signr); |
69be8f18 SR |
484 | recalc_sigpending(); |
485 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
486 | } |
487 | ||
488 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
489 | struct sigaction *sa) | |
490 | { | |
491 | switch (regs->u_regs[UREG_I0]) { | |
492 | case ERESTART_RESTARTBLOCK: | |
493 | case ERESTARTNOHAND: | |
494 | no_system_call_restart: | |
495 | regs->u_regs[UREG_I0] = EINTR; | |
496 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
497 | break; | |
498 | case ERESTARTSYS: | |
499 | if (!(sa->sa_flags & SA_RESTART)) | |
500 | goto no_system_call_restart; | |
501 | /* fallthrough */ | |
502 | case ERESTARTNOINTR: | |
503 | regs->u_regs[UREG_I0] = orig_i0; | |
504 | regs->tpc -= 4; | |
505 | regs->tnpc -= 4; | |
506 | } | |
507 | } | |
508 | ||
509 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
510 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
511 | * mistake. | |
512 | */ | |
238468b2 | 513 | static void do_signal(struct pt_regs *regs, unsigned long orig_i0) |
1da177e4 | 514 | { |
1da177e4 LT |
515 | struct signal_deliver_cookie cookie; |
516 | struct k_sigaction ka; | |
2d7d5f05 | 517 | sigset_t *oldset; |
238468b2 DM |
518 | siginfo_t info; |
519 | int signr, tt; | |
1da177e4 | 520 | |
238468b2 DM |
521 | tt = regs->magic & 0x1ff; |
522 | if (tt == 0x110 || tt == 0x111 || tt == 0x16d) { | |
523 | regs->magic &= ~0x1ff; | |
524 | cookie.restart_syscall = 1; | |
525 | } else | |
526 | cookie.restart_syscall = 0; | |
1da177e4 LT |
527 | cookie.orig_i0 = orig_i0; |
528 | ||
2d7d5f05 DM |
529 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
530 | oldset = ¤t->saved_sigmask; | |
531 | else | |
1da177e4 LT |
532 | oldset = ¤t->blocked; |
533 | ||
534 | #ifdef CONFIG_SPARC32_COMPAT | |
535 | if (test_thread_flag(TIF_32BIT)) { | |
2d7d5f05 | 536 | extern void do_signal32(sigset_t *, struct pt_regs *, |
238468b2 DM |
537 | struct signal_deliver_cookie *); |
538 | do_signal32(oldset, regs, &cookie); | |
2d7d5f05 | 539 | return; |
1da177e4 LT |
540 | } |
541 | #endif | |
542 | ||
543 | signr = get_signal_to_deliver(&info, &ka, regs, &cookie); | |
544 | if (signr > 0) { | |
545 | if (cookie.restart_syscall) | |
238468b2 | 546 | syscall_restart(cookie.orig_i0, regs, &ka.sa); |
1da177e4 | 547 | handle_signal(signr, &ka, &info, oldset, regs); |
2d7d5f05 DM |
548 | |
549 | /* a signal was successfully delivered; the saved | |
550 | * sigmask will have been stored in the signal frame, | |
551 | * and will be restored by sigreturn, so we can simply | |
552 | * clear the TIF_RESTORE_SIGMASK flag. | |
553 | */ | |
554 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
555 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
556 | return; | |
1da177e4 LT |
557 | } |
558 | if (cookie.restart_syscall && | |
559 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
560 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
561 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
562 | /* replay the system call when we are done */ | |
563 | regs->u_regs[UREG_I0] = cookie.orig_i0; | |
564 | regs->tpc -= 4; | |
565 | regs->tnpc -= 4; | |
566 | } | |
567 | if (cookie.restart_syscall && | |
568 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
569 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
570 | regs->tpc -= 4; | |
571 | regs->tnpc -= 4; | |
572 | } | |
2d7d5f05 DM |
573 | |
574 | /* if there's no signal to deliver, we just put the saved sigmask | |
575 | * back | |
576 | */ | |
577 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
578 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
579 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
580 | } | |
1da177e4 LT |
581 | } |
582 | ||
7697daaa | 583 | void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) |
1da177e4 | 584 | { |
2d7d5f05 | 585 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
238468b2 | 586 | do_signal(regs, orig_i0); |
1da177e4 LT |
587 | } |
588 | ||
589 | void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) | |
590 | { | |
591 | struct signal_deliver_cookie *cp = cookie; | |
592 | ||
593 | if (cp->restart_syscall && | |
594 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
595 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
596 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
597 | /* replay the system call when we are done */ | |
598 | regs->u_regs[UREG_I0] = cp->orig_i0; | |
599 | regs->tpc -= 4; | |
600 | regs->tnpc -= 4; | |
601 | cp->restart_syscall = 0; | |
602 | } | |
603 | if (cp->restart_syscall && | |
604 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
605 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
606 | regs->tpc -= 4; | |
607 | regs->tnpc -= 4; | |
608 | cp->restart_syscall = 0; | |
609 | } | |
610 | } |