Commit | Line | Data |
---|---|---|
b00dc837 | 1 | /* |
1da177e4 LT |
2 | * arch/sparc64/kernel/signal.c |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
0a4949c4 | 5 | * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
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 | ||
09337f50 | 11 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
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> | |
e35a8925 | 20 | #include <linux/tracehook.h> |
1da177e4 LT |
21 | #include <linux/unistd.h> |
22 | #include <linux/mm.h> | |
23 | #include <linux/tty.h> | |
1da177e4 LT |
24 | #include <linux/binfmts.h> |
25 | #include <linux/bitops.h> | |
26 | ||
27 | #include <asm/uaccess.h> | |
28 | #include <asm/ptrace.h> | |
1da177e4 LT |
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 | ||
062ea6d3 DM |
35 | #include "entry.h" |
36 | #include "systbls.h" | |
5598473a | 37 | #include "sigutil.h" |
062ea6d3 | 38 | |
1da177e4 LT |
39 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
40 | ||
1da177e4 LT |
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); | |
faddf598 | 73 | set_current_blocked(&set); |
1da177e4 LT |
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])); | |
0a4949c4 DM |
91 | |
92 | /* Skip %g7 as that's the thread register in userspace. */ | |
93 | ||
1da177e4 LT |
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; | |
5598473a | 237 | __siginfo_rwin_t *rwin_save; |
1da177e4 LT |
238 | }; |
239 | ||
2d7d5f05 | 240 | static long _sigpause_common(old_sigset_t set) |
1da177e4 | 241 | { |
faddf598 MF |
242 | sigset_t blocked; |
243 | ||
2d7d5f05 | 244 | current->saved_sigmask = current->blocked; |
faddf598 MF |
245 | |
246 | set &= _BLOCKABLE; | |
247 | siginitset(&blocked, set); | |
248 | set_current_blocked(&blocked); | |
1da177e4 | 249 | |
2d7d5f05 DM |
250 | current->state = TASK_INTERRUPTIBLE; |
251 | schedule(); | |
9a28dbf8 DM |
252 | |
253 | set_restore_sigmask(); | |
254 | ||
2d7d5f05 | 255 | return -ERESTARTNOHAND; |
1da177e4 LT |
256 | } |
257 | ||
2d7d5f05 | 258 | asmlinkage long sys_sigpause(unsigned int set) |
1da177e4 | 259 | { |
2d7d5f05 | 260 | return _sigpause_common(set); |
1da177e4 LT |
261 | } |
262 | ||
2d7d5f05 | 263 | asmlinkage long sys_sigsuspend(old_sigset_t set) |
1da177e4 | 264 | { |
2d7d5f05 | 265 | return _sigpause_common(set); |
1da177e4 LT |
266 | } |
267 | ||
1da177e4 LT |
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; | |
5598473a | 273 | __siginfo_rwin_t __user *rwin_save; |
1da177e4 | 274 | sigset_t set; |
1da177e4 LT |
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); | |
5598473a DM |
306 | if (!err && fpu_save) |
307 | err |= restore_fpu_state(regs, fpu_save); | |
1da177e4 LT |
308 | |
309 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); | |
62715ec8 ON |
310 | err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf); |
311 | ||
1da177e4 LT |
312 | if (err) |
313 | goto segv; | |
62715ec8 | 314 | |
5598473a DM |
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 | ||
1da177e4 LT |
321 | regs->tpc = tpc; |
322 | regs->tnpc = tnpc; | |
1da177e4 | 323 | |
2678fefe | 324 | /* Prevent syscall restart. */ |
28e61036 | 325 | pt_regs_clear_syscall(regs); |
2678fefe | 326 | |
1da177e4 | 327 | sigdelsetmask(&set, ~_BLOCKABLE); |
faddf598 | 328 | set_current_blocked(&set); |
1da177e4 LT |
329 | return; |
330 | segv: | |
331 | force_sig(SIGSEGV, current); | |
332 | } | |
333 | ||
334 | /* Checks if the fp is valid */ | |
5598473a | 335 | static int invalid_frame_pointer(void __user *fp) |
1da177e4 | 336 | { |
f036d9f3 | 337 | if (((unsigned long) fp) & 15) |
1da177e4 LT |
338 | return 1; |
339 | return 0; | |
340 | } | |
341 | ||
1da177e4 LT |
342 | static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) |
343 | { | |
dc5dc7e6 | 344 | unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS; |
1da177e4 | 345 | |
dc5dc7e6 DM |
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; | |
1da177e4 LT |
352 | |
353 | /* This is the X/Open sanctioned signal stack switching. */ | |
354 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
dc5dc7e6 | 355 | if (sas_ss_flags(sp) == 0) |
1da177e4 LT |
356 | sp = current->sas_ss_sp + current->sas_ss_size; |
357 | } | |
dc5dc7e6 | 358 | |
f036d9f3 DM |
359 | sp -= framesize; |
360 | ||
dc5dc7e6 DM |
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 | */ | |
f036d9f3 | 367 | sp &= ~15UL; |
dc5dc7e6 | 368 | |
f036d9f3 | 369 | return (void __user *) sp; |
1da177e4 LT |
370 | } |
371 | ||
392c2180 | 372 | static inline int |
1da177e4 LT |
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; | |
5598473a DM |
377 | int wsaved, err, sf_size; |
378 | void __user *tail; | |
1da177e4 LT |
379 | |
380 | /* 1. Make sure everything is clean */ | |
381 | synchronize_user_stack(); | |
382 | save_and_clear_fpu(); | |
383 | ||
5598473a | 384 | wsaved = get_thread_wsaved(); |
1da177e4 | 385 | |
5598473a DM |
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); | |
1da177e4 | 391 | sf = (struct rt_signal_frame __user *) |
5598473a | 392 | get_sigframe(ka, regs, sf_size); |
1da177e4 | 393 | |
5598473a | 394 | if (invalid_frame_pointer (sf)) |
1da177e4 LT |
395 | goto sigill; |
396 | ||
5598473a DM |
397 | tail = (sf + 1); |
398 | ||
1da177e4 LT |
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) { | |
5598473a DM |
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); | |
1da177e4 LT |
407 | } else { |
408 | err |= __put_user(0, &sf->fpu_save); | |
409 | } | |
5598473a DM |
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 | } | |
1da177e4 LT |
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 | ||
5598473a DM |
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; | |
1da177e4 | 434 | |
5598473a DM |
435 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; |
436 | err |= copy_to_user(sf, rp, sizeof(struct reg_window)); | |
437 | } | |
1da177e4 LT |
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; | |
392c2180 | 467 | return 0; |
1da177e4 LT |
468 | |
469 | sigill: | |
470 | do_exit(SIGILL); | |
392c2180 DM |
471 | return -EINVAL; |
472 | ||
1da177e4 LT |
473 | sigsegv: |
474 | force_sigsegv(signo, current); | |
392c2180 | 475 | return -EFAULT; |
1da177e4 LT |
476 | } |
477 | ||
392c2180 DM |
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) | |
1da177e4 | 481 | { |
392c2180 DM |
482 | int err; |
483 | ||
484 | err = setup_rt_frame(ka, regs, signr, oldset, | |
485 | (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); | |
486 | if (err) | |
487 | return err; | |
392c2180 | 488 | |
ce24d8a1 | 489 | block_sigmask(ka, signr); |
392c2180 DM |
490 | tracehook_signal_handler(signr, info, ka, regs, 0); |
491 | ||
492 | return 0; | |
1da177e4 LT |
493 | } |
494 | ||
495 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
28e61036 | 496 | struct sigaction *sa) |
1da177e4 LT |
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 | */ | |
238468b2 | 520 | static void do_signal(struct pt_regs *regs, unsigned long orig_i0) |
1da177e4 | 521 | { |
1da177e4 | 522 | struct k_sigaction ka; |
28e61036 | 523 | int restart_syscall; |
2d7d5f05 | 524 | sigset_t *oldset; |
238468b2 | 525 | siginfo_t info; |
90888816 | 526 | int signr; |
1da177e4 | 527 | |
1d299bc7 DM |
528 | /* It's a lot of work and synchronization to add a new ptrace |
529 | * register for GDB to save and restore in order to get | |
530 | * orig_i0 correct for syscall restarts when debugging. | |
531 | * | |
e88d2468 DM |
532 | * Although it should be the case that most of the global |
533 | * registers are volatile across a system call, glibc already | |
534 | * depends upon that fact that we preserve them. So we can't | |
535 | * just use any global register to save away the orig_i0 value. | |
536 | * | |
537 | * In particular %g2, %g3, %g4, and %g5 are all assumed to be | |
538 | * preserved across a system call trap by various pieces of | |
539 | * code in glibc. | |
540 | * | |
541 | * %g7 is used as the "thread register". %g6 is not used in | |
542 | * any fixed manner. %g6 is used as a scratch register and | |
543 | * a compiler temporary, but it's value is never used across | |
544 | * a system call. Therefore %g6 is usable for orig_i0 storage. | |
1d299bc7 | 545 | */ |
2678fefe | 546 | if (pt_regs_is_syscall(regs) && |
1d299bc7 | 547 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) |
e88d2468 | 548 | regs->u_regs[UREG_G6] = orig_i0; |
1da177e4 | 549 | |
9a28dbf8 | 550 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
2d7d5f05 DM |
551 | oldset = ¤t->saved_sigmask; |
552 | else | |
1da177e4 LT |
553 | oldset = ¤t->blocked; |
554 | ||
09337f50 | 555 | #ifdef CONFIG_COMPAT |
1da177e4 | 556 | if (test_thread_flag(TIF_32BIT)) { |
1d299bc7 DM |
557 | extern void do_signal32(sigset_t *, struct pt_regs *); |
558 | do_signal32(oldset, regs); | |
2d7d5f05 | 559 | return; |
1da177e4 LT |
560 | } |
561 | #endif | |
562 | ||
28e61036 DM |
563 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
564 | ||
1d299bc7 DM |
565 | restart_syscall = 0; |
566 | if (pt_regs_is_syscall(regs) && | |
567 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { | |
568 | restart_syscall = 1; | |
e88d2468 | 569 | orig_i0 = regs->u_regs[UREG_G6]; |
1d299bc7 | 570 | } |
28e61036 | 571 | |
1da177e4 | 572 | if (signr > 0) { |
28e61036 DM |
573 | if (restart_syscall) |
574 | syscall_restart(orig_i0, regs, &ka.sa); | |
392c2180 DM |
575 | if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { |
576 | /* A signal was successfully delivered; the saved | |
577 | * sigmask will have been stored in the signal frame, | |
578 | * and will be restored by sigreturn, so we can simply | |
579 | * clear the TS_RESTORE_SIGMASK flag. | |
580 | */ | |
581 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
582 | } | |
2d7d5f05 | 583 | return; |
1da177e4 | 584 | } |
28e61036 | 585 | if (restart_syscall && |
1da177e4 LT |
586 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || |
587 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
588 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
589 | /* replay the system call when we are done */ | |
28e61036 | 590 | regs->u_regs[UREG_I0] = orig_i0; |
1da177e4 LT |
591 | regs->tpc -= 4; |
592 | regs->tnpc -= 4; | |
c2785259 | 593 | pt_regs_clear_syscall(regs); |
1da177e4 | 594 | } |
28e61036 | 595 | if (restart_syscall && |
1da177e4 LT |
596 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { |
597 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
598 | regs->tpc -= 4; | |
599 | regs->tnpc -= 4; | |
c2785259 | 600 | pt_regs_clear_syscall(regs); |
1da177e4 | 601 | } |
2d7d5f05 | 602 | |
9a28dbf8 | 603 | /* If there's no signal to deliver, we just put the saved sigmask |
2d7d5f05 DM |
604 | * back |
605 | */ | |
9a28dbf8 DM |
606 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
607 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
27f20dca | 608 | set_current_blocked(¤t->saved_sigmask); |
2d7d5f05 | 609 | } |
1da177e4 LT |
610 | } |
611 | ||
7697daaa | 612 | void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) |
1da177e4 | 613 | { |
9a28dbf8 | 614 | if (thread_info_flags & _TIF_SIGPENDING) |
238468b2 | 615 | do_signal(regs, orig_i0); |
e35a8925 RM |
616 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
617 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
618 | tracehook_notify_resume(regs); | |
ee18d64c DH |
619 | if (current->replacement_session_keyring) |
620 | key_replace_session_keyring(); | |
e35a8925 | 621 | } |
1da177e4 | 622 | } |
ee18d64c | 623 |