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Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago. By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant. | |
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1 | /* |
2 | * arch/sparc64/kernel/signal.c |
3 | * |
4 | * Copyright (C) 1991, 1992 Linus Torvalds |
5 | * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) |
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 | #ifdef CONFIG_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/tracehook.h> |
21 | #include <linux/unistd.h> |
22 | #include <linux/mm.h> |
23 | #include <linux/tty.h> |
24 | #include <linux/binfmts.h> |
25 | #include <linux/bitops.h> |
26 | |
27 | #include <asm/uaccess.h> |
28 | #include <asm/ptrace.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 | #include "entry.h" |
36 | #include "systbls.h" |
37 | #include "sigutil.h" |
38 | |
39 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
40 | |
41 | /* {set, get}context() needed for 64-bit SparcLinux userland. */ |
42 | asmlinkage void sparc64_set_context(struct pt_regs *regs) |
43 | { |
44 | struct ucontext __user *ucp = (struct ucontext __user *) |
45 | regs->u_regs[UREG_I0]; |
46 | mc_gregset_t __user *grp; |
47 | unsigned long pc, npc, tstate; |
48 | unsigned long fp, i7; |
49 | unsigned char fenab; |
50 | int err; |
51 | |
52 | flush_user_windows(); |
53 | if (get_thread_wsaved() || |
54 | (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || |
55 | (!__access_ok(ucp, sizeof(*ucp)))) |
56 | goto do_sigsegv; |
57 | grp = &ucp->uc_mcontext.mc_gregs; |
58 | err = __get_user(pc, &((*grp)[MC_PC])); |
59 | err |= __get_user(npc, &((*grp)[MC_NPC])); |
60 | if (err || ((pc | npc) & 3)) |
61 | goto do_sigsegv; |
62 | if (regs->u_regs[UREG_I1]) { |
63 | sigset_t set; |
64 | |
65 | if (_NSIG_WORDS == 1) { |
66 | if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) |
67 | goto do_sigsegv; |
68 | } else { |
69 | if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) |
70 | goto do_sigsegv; |
71 | } |
72 | sigdelsetmask(&set, ~_BLOCKABLE); |
73 | set_current_blocked(&set); |
74 | } |
75 | if (test_thread_flag(TIF_32BIT)) { |
76 | pc &= 0xffffffff; |
77 | npc &= 0xffffffff; |
78 | } |
79 | regs->tpc = pc; |
80 | regs->tnpc = npc; |
81 | err |= __get_user(regs->y, &((*grp)[MC_Y])); |
82 | err |= __get_user(tstate, &((*grp)[MC_TSTATE])); |
83 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); |
84 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); |
85 | err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); |
86 | err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); |
87 | err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); |
88 | err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); |
89 | err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); |
90 | err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); |
91 | |
92 | /* Skip %g7 as that's the thread register in userspace. */ |
93 | |
94 | err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); |
95 | err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); |
96 | err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); |
97 | err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); |
98 | err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); |
99 | err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); |
100 | err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); |
101 | err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); |
102 | |
103 | err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); |
104 | err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); |
105 | err |= __put_user(fp, |
106 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); |
107 | err |= __put_user(i7, |
108 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); |
109 | |
110 | err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); |
111 | if (fenab) { |
112 | unsigned long *fpregs = current_thread_info()->fpregs; |
113 | unsigned long fprs; |
114 | |
115 | fprs_write(0); |
116 | err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); |
117 | if (fprs & FPRS_DL) |
118 | err |= copy_from_user(fpregs, |
119 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), |
120 | (sizeof(unsigned int) * 32)); |
121 | if (fprs & FPRS_DU) |
122 | err |= copy_from_user(fpregs+16, |
123 | ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, |
124 | (sizeof(unsigned int) * 32)); |
125 | err |= __get_user(current_thread_info()->xfsr[0], |
126 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); |
127 | err |= __get_user(current_thread_info()->gsr[0], |
128 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); |
129 | regs->tstate &= ~TSTATE_PEF; |
130 | } |
131 | if (err) |
132 | goto do_sigsegv; |
133 | |
134 | return; |
135 | do_sigsegv: |
136 | force_sig(SIGSEGV, current); |
137 | } |
138 | |
139 | asmlinkage void sparc64_get_context(struct pt_regs *regs) |
140 | { |
141 | struct ucontext __user *ucp = (struct ucontext __user *) |
142 | regs->u_regs[UREG_I0]; |
143 | mc_gregset_t __user *grp; |
144 | mcontext_t __user *mcp; |
145 | unsigned long fp, i7; |
146 | unsigned char fenab; |
147 | int err; |
148 | |
149 | synchronize_user_stack(); |
150 | if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) |
151 | goto do_sigsegv; |
152 | |
153 | #if 1 |
154 | fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ |
155 | #else |
156 | fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); |
157 | #endif |
158 | |
159 | mcp = &ucp->uc_mcontext; |
160 | grp = &mcp->mc_gregs; |
161 | |
162 | /* Skip over the trap instruction, first. */ |
163 | if (test_thread_flag(TIF_32BIT)) { |
164 | regs->tpc = (regs->tnpc & 0xffffffff); |
165 | regs->tnpc = (regs->tnpc + 4) & 0xffffffff; |
166 | } else { |
167 | regs->tpc = regs->tnpc; |
168 | regs->tnpc += 4; |
169 | } |
170 | err = 0; |
171 | if (_NSIG_WORDS == 1) |
172 | err |= __put_user(current->blocked.sig[0], |
173 | (unsigned long __user *)&ucp->uc_sigmask); |
174 | else |
175 | err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, |
176 | sizeof(sigset_t)); |
177 | |
178 | err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); |
179 | err |= __put_user(regs->tpc, &((*grp)[MC_PC])); |
180 | err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); |
181 | err |= __put_user(regs->y, &((*grp)[MC_Y])); |
182 | err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); |
183 | err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); |
184 | err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); |
185 | err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); |
186 | err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); |
187 | err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); |
188 | err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); |
189 | err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); |
190 | err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); |
191 | err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); |
192 | err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); |
193 | err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); |
194 | err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); |
195 | err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); |
196 | err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); |
197 | |
198 | err |= __get_user(fp, |
199 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); |
200 | err |= __get_user(i7, |
201 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); |
202 | err |= __put_user(fp, &(mcp->mc_fp)); |
203 | err |= __put_user(i7, &(mcp->mc_i7)); |
204 | |
205 | err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); |
206 | if (fenab) { |
207 | unsigned long *fpregs = current_thread_info()->fpregs; |
208 | unsigned long fprs; |
209 | |
210 | fprs = current_thread_info()->fpsaved[0]; |
211 | if (fprs & FPRS_DL) |
212 | err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, |
213 | (sizeof(unsigned int) * 32)); |
214 | if (fprs & FPRS_DU) |
215 | err |= copy_to_user( |
216 | ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, |
217 | (sizeof(unsigned int) * 32)); |
218 | err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); |
219 | err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); |
220 | err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); |
221 | } |
222 | if (err) |
223 | goto do_sigsegv; |
224 | |
225 | return; |
226 | do_sigsegv: |
227 | force_sig(SIGSEGV, current); |
228 | } |
229 | |
230 | struct rt_signal_frame { |
231 | struct sparc_stackf ss; |
232 | siginfo_t info; |
233 | struct pt_regs regs; |
234 | __siginfo_fpu_t __user *fpu_save; |
235 | stack_t stack; |
236 | sigset_t mask; |
237 | __siginfo_rwin_t *rwin_save; |
238 | }; |
239 | |
240 | static long _sigpause_common(old_sigset_t set) |
241 | { |
242 | sigset_t blocked; |
243 | |
244 | current->saved_sigmask = current->blocked; |
245 | |
246 | set &= _BLOCKABLE; |
247 | siginitset(&blocked, set); |
248 | set_current_blocked(&blocked); |
249 | |
250 | current->state = TASK_INTERRUPTIBLE; |
251 | schedule(); |
252 | |
253 | set_restore_sigmask(); |
254 | |
255 | return -ERESTARTNOHAND; |
256 | } |
257 | |
258 | asmlinkage long sys_sigpause(unsigned int set) |
259 | { |
260 | return _sigpause_common(set); |
261 | } |
262 | |
263 | asmlinkage long sys_sigsuspend(old_sigset_t set) |
264 | { |
265 | return _sigpause_common(set); |
266 | } |
267 | |
268 | void do_rt_sigreturn(struct pt_regs *regs) |
269 | { |
270 | struct rt_signal_frame __user *sf; |
271 | unsigned long tpc, tnpc, tstate; |
272 | __siginfo_fpu_t __user *fpu_save; |
273 | __siginfo_rwin_t __user *rwin_save; |
274 | sigset_t set; |
275 | int err; |
276 | |
277 | /* Always make any pending restarted system calls return -EINTR */ |
278 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
279 | |
280 | synchronize_user_stack (); |
281 | sf = (struct rt_signal_frame __user *) |
282 | (regs->u_regs [UREG_FP] + STACK_BIAS); |
283 | |
284 | /* 1. Make sure we are not getting garbage from the user */ |
285 | if (((unsigned long) sf) & 3) |
286 | goto segv; |
287 | |
288 | err = get_user(tpc, &sf->regs.tpc); |
289 | err |= __get_user(tnpc, &sf->regs.tnpc); |
290 | if (test_thread_flag(TIF_32BIT)) { |
291 | tpc &= 0xffffffff; |
292 | tnpc &= 0xffffffff; |
293 | } |
294 | err |= ((tpc | tnpc) & 3); |
295 | |
296 | /* 2. Restore the state */ |
297 | err |= __get_user(regs->y, &sf->regs.y); |
298 | err |= __get_user(tstate, &sf->regs.tstate); |
299 | err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); |
300 | |
301 | /* User can only change condition codes and %asi in %tstate. */ |
302 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); |
303 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); |
304 | |
305 | err |= __get_user(fpu_save, &sf->fpu_save); |
306 | if (!err && fpu_save) |
307 | err |= restore_fpu_state(regs, fpu_save); |
308 | |
309 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); |
310 | err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf); |
311 | |
312 | if (err) |
313 | goto segv; |
314 | |
315 | err |= __get_user(rwin_save, &sf->rwin_save); |
316 | if (!err && rwin_save) { |
317 | if (restore_rwin_state(rwin_save)) |
318 | goto segv; |
319 | } |
320 | |
321 | regs->tpc = tpc; |
322 | regs->tnpc = tnpc; |
323 | |
324 | /* Prevent syscall restart. */ |
325 | pt_regs_clear_syscall(regs); |
326 | |
327 | sigdelsetmask(&set, ~_BLOCKABLE); |
328 | set_current_blocked(&set); |
329 | return; |
330 | segv: |
331 | force_sig(SIGSEGV, current); |
332 | } |
333 | |
334 | /* Checks if the fp is valid */ |
335 | static int invalid_frame_pointer(void __user *fp) |
336 | { |
337 | if (((unsigned long) fp) & 15) |
338 | return 1; |
339 | return 0; |
340 | } |
341 | |
342 | static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) |
343 | { |
344 | unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS; |
345 | |
346 | /* |
347 | * If we are on the alternate signal stack and would overflow it, don't. |
348 | * Return an always-bogus address instead so we will die with SIGSEGV. |
349 | */ |
350 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) |
351 | return (void __user *) -1L; |
352 | |
353 | /* This is the X/Open sanctioned signal stack switching. */ |
354 | if (ka->sa.sa_flags & SA_ONSTACK) { |
355 | if (sas_ss_flags(sp) == 0) |
356 | sp = current->sas_ss_sp + current->sas_ss_size; |
357 | } |
358 | |
359 | sp -= framesize; |
360 | |
361 | /* Always align the stack frame. This handles two cases. First, |
362 | * sigaltstack need not be mindful of platform specific stack |
363 | * alignment. Second, if we took this signal because the stack |
364 | * is not aligned properly, we'd like to take the signal cleanly |
365 | * and report that. |
366 | */ |
367 | sp &= ~15UL; |
368 | |
369 | return (void __user *) sp; |
370 | } |
371 | |
372 | static inline int |
373 | setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, |
374 | int signo, sigset_t *oldset, siginfo_t *info) |
375 | { |
376 | struct rt_signal_frame __user *sf; |
377 | int wsaved, err, sf_size; |
378 | void __user *tail; |
379 | |
380 | /* 1. Make sure everything is clean */ |
381 | synchronize_user_stack(); |
382 | save_and_clear_fpu(); |
383 | |
384 | wsaved = get_thread_wsaved(); |
385 | |
386 | sf_size = sizeof(struct rt_signal_frame); |
387 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) |
388 | sf_size += sizeof(__siginfo_fpu_t); |
389 | if (wsaved) |
390 | sf_size += sizeof(__siginfo_rwin_t); |
391 | sf = (struct rt_signal_frame __user *) |
392 | get_sigframe(ka, regs, sf_size); |
393 | |
394 | if (invalid_frame_pointer (sf)) |
395 | goto sigill; |
396 | |
397 | tail = (sf + 1); |
398 | |
399 | /* 2. Save the current process state */ |
400 | err = copy_to_user(&sf->regs, regs, sizeof (*regs)); |
401 | |
402 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) { |
403 | __siginfo_fpu_t __user *fpu_save = tail; |
404 | tail += sizeof(__siginfo_fpu_t); |
405 | err |= save_fpu_state(regs, fpu_save); |
406 | err |= __put_user((u64)fpu_save, &sf->fpu_save); |
407 | } else { |
408 | err |= __put_user(0, &sf->fpu_save); |
409 | } |
410 | if (wsaved) { |
411 | __siginfo_rwin_t __user *rwin_save = tail; |
412 | tail += sizeof(__siginfo_rwin_t); |
413 | err |= save_rwin_state(wsaved, rwin_save); |
414 | err |= __put_user((u64)rwin_save, &sf->rwin_save); |
415 | set_thread_wsaved(0); |
416 | } else { |
417 | err |= __put_user(0, &sf->rwin_save); |
418 | } |
419 | |
420 | /* Setup sigaltstack */ |
421 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); |
422 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); |
423 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); |
424 | |
425 | err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); |
426 | |
427 | if (!wsaved) { |
428 | err |= copy_in_user((u64 __user *)sf, |
429 | (u64 __user *)(regs->u_regs[UREG_FP] + |
430 | STACK_BIAS), |
431 | sizeof(struct reg_window)); |
432 | } else { |
433 | struct reg_window *rp; |
434 | |
435 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; |
436 | err |= copy_to_user(sf, rp, sizeof(struct reg_window)); |
437 | } |
438 | if (info) |
439 | err |= copy_siginfo_to_user(&sf->info, info); |
440 | else { |
441 | err |= __put_user(signo, &sf->info.si_signo); |
442 | err |= __put_user(SI_NOINFO, &sf->info.si_code); |
443 | } |
444 | if (err) |
445 | goto sigsegv; |
446 | |
447 | /* 3. signal handler back-trampoline and parameters */ |
448 | regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; |
449 | regs->u_regs[UREG_I0] = signo; |
450 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
451 | |
452 | /* The sigcontext is passed in this way because of how it |
453 | * is defined in GLIBC's /usr/include/bits/sigcontext.h |
454 | * for sparc64. It includes the 128 bytes of siginfo_t. |
455 | */ |
456 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; |
457 | |
458 | /* 5. signal handler */ |
459 | regs->tpc = (unsigned long) ka->sa.sa_handler; |
460 | regs->tnpc = (regs->tpc + 4); |
461 | if (test_thread_flag(TIF_32BIT)) { |
462 | regs->tpc &= 0xffffffff; |
463 | regs->tnpc &= 0xffffffff; |
464 | } |
465 | /* 4. return to kernel instructions */ |
466 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; |
467 | return 0; |
468 | |
469 | sigill: |
470 | do_exit(SIGILL); |
471 | return -EINVAL; |
472 | |
473 | sigsegv: |
474 | force_sigsegv(signo, current); |
475 | return -EFAULT; |
476 | } |
477 | |
478 | static inline int handle_signal(unsigned long signr, struct k_sigaction *ka, |
479 | siginfo_t *info, |
480 | sigset_t *oldset, struct pt_regs *regs) |
481 | { |
482 | sigset_t blocked; |
483 | int err; |
484 | |
485 | err = setup_rt_frame(ka, regs, signr, oldset, |
486 | (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); |
487 | if (err) |
488 | return err; |
489 | sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); |
490 | if (!(ka->sa.sa_flags & SA_NOMASK)) |
491 | sigaddset(&blocked, signr); |
492 | set_current_blocked(&blocked); |
493 | |
494 | tracehook_signal_handler(signr, info, ka, regs, 0); |
495 | |
496 | return 0; |
497 | } |
498 | |
499 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, |
500 | struct sigaction *sa) |
501 | { |
502 | switch (regs->u_regs[UREG_I0]) { |
503 | case ERESTART_RESTARTBLOCK: |
504 | case ERESTARTNOHAND: |
505 | no_system_call_restart: |
506 | regs->u_regs[UREG_I0] = EINTR; |
507 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); |
508 | break; |
509 | case ERESTARTSYS: |
510 | if (!(sa->sa_flags & SA_RESTART)) |
511 | goto no_system_call_restart; |
512 | /* fallthrough */ |
513 | case ERESTARTNOINTR: |
514 | regs->u_regs[UREG_I0] = orig_i0; |
515 | regs->tpc -= 4; |
516 | regs->tnpc -= 4; |
517 | } |
518 | } |
519 | |
520 | /* Note that 'init' is a special process: it doesn't get signals it doesn't |
521 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
522 | * mistake. |
523 | */ |
524 | static void do_signal(struct pt_regs *regs, unsigned long orig_i0) |
525 | { |
526 | struct k_sigaction ka; |
527 | int restart_syscall; |
528 | sigset_t *oldset; |
529 | siginfo_t info; |
530 | int signr; |
531 | |
532 | /* It's a lot of work and synchronization to add a new ptrace |
533 | * register for GDB to save and restore in order to get |
534 | * orig_i0 correct for syscall restarts when debugging. |
535 | * |
536 | * Although it should be the case that most of the global |
537 | * registers are volatile across a system call, glibc already |
538 | * depends upon that fact that we preserve them. So we can't |
539 | * just use any global register to save away the orig_i0 value. |
540 | * |
541 | * In particular %g2, %g3, %g4, and %g5 are all assumed to be |
542 | * preserved across a system call trap by various pieces of |
543 | * code in glibc. |
544 | * |
545 | * %g7 is used as the "thread register". %g6 is not used in |
546 | * any fixed manner. %g6 is used as a scratch register and |
547 | * a compiler temporary, but it's value is never used across |
548 | * a system call. Therefore %g6 is usable for orig_i0 storage. |
549 | */ |
550 | if (pt_regs_is_syscall(regs) && |
551 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) |
552 | regs->u_regs[UREG_G6] = orig_i0; |
553 | |
554 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
555 | oldset = ¤t->saved_sigmask; |
556 | else |
557 | oldset = ¤t->blocked; |
558 | |
559 | #ifdef CONFIG_COMPAT |
560 | if (test_thread_flag(TIF_32BIT)) { |
561 | extern void do_signal32(sigset_t *, struct pt_regs *); |
562 | do_signal32(oldset, regs); |
563 | return; |
564 | } |
565 | #endif |
566 | |
567 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
568 | |
569 | restart_syscall = 0; |
570 | if (pt_regs_is_syscall(regs) && |
571 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { |
572 | restart_syscall = 1; |
573 | orig_i0 = regs->u_regs[UREG_G6]; |
574 | } |
575 | |
576 | if (signr > 0) { |
577 | if (restart_syscall) |
578 | syscall_restart(orig_i0, regs, &ka.sa); |
579 | if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { |
580 | /* A signal was successfully delivered; the saved |
581 | * sigmask will have been stored in the signal frame, |
582 | * and will be restored by sigreturn, so we can simply |
583 | * clear the TS_RESTORE_SIGMASK flag. |
584 | */ |
585 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
586 | } |
587 | return; |
588 | } |
589 | if (restart_syscall && |
590 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || |
591 | regs->u_regs[UREG_I0] == ERESTARTSYS || |
592 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { |
593 | /* replay the system call when we are done */ |
594 | regs->u_regs[UREG_I0] = orig_i0; |
595 | regs->tpc -= 4; |
596 | regs->tnpc -= 4; |
597 | pt_regs_clear_syscall(regs); |
598 | } |
599 | if (restart_syscall && |
600 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { |
601 | regs->u_regs[UREG_G1] = __NR_restart_syscall; |
602 | regs->tpc -= 4; |
603 | regs->tnpc -= 4; |
604 | pt_regs_clear_syscall(regs); |
605 | } |
606 | |
607 | /* If there's no signal to deliver, we just put the saved sigmask |
608 | * back |
609 | */ |
610 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
611 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
612 | set_current_blocked(¤t->saved_sigmask); |
613 | } |
614 | } |
615 | |
616 | void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) |
617 | { |
618 | if (thread_info_flags & _TIF_SIGPENDING) |
619 | do_signal(regs, orig_i0); |
620 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
621 | clear_thread_flag(TIF_NOTIFY_RESUME); |
622 | tracehook_notify_resume(regs); |
623 | if (current->replacement_session_keyring) |
624 | key_replace_session_keyring(); |
625 | } |
626 | } |
627 | |
628 |
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v2.6.34-rc5
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