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" | |
37 | ||
1da177e4 LT |
38 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
39 | ||
1da177e4 LT |
40 | /* {set, get}context() needed for 64-bit SparcLinux userland. */ |
41 | asmlinkage void sparc64_set_context(struct pt_regs *regs) | |
42 | { | |
43 | struct ucontext __user *ucp = (struct ucontext __user *) | |
44 | regs->u_regs[UREG_I0]; | |
45 | mc_gregset_t __user *grp; | |
46 | unsigned long pc, npc, tstate; | |
47 | unsigned long fp, i7; | |
48 | unsigned char fenab; | |
49 | int err; | |
50 | ||
51 | flush_user_windows(); | |
52 | if (get_thread_wsaved() || | |
53 | (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || | |
54 | (!__access_ok(ucp, sizeof(*ucp)))) | |
55 | goto do_sigsegv; | |
56 | grp = &ucp->uc_mcontext.mc_gregs; | |
57 | err = __get_user(pc, &((*grp)[MC_PC])); | |
58 | err |= __get_user(npc, &((*grp)[MC_NPC])); | |
59 | if (err || ((pc | npc) & 3)) | |
60 | goto do_sigsegv; | |
61 | if (regs->u_regs[UREG_I1]) { | |
62 | sigset_t set; | |
63 | ||
64 | if (_NSIG_WORDS == 1) { | |
65 | if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) | |
66 | goto do_sigsegv; | |
67 | } else { | |
68 | if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) | |
69 | goto do_sigsegv; | |
70 | } | |
71 | sigdelsetmask(&set, ~_BLOCKABLE); | |
72 | spin_lock_irq(¤t->sighand->siglock); | |
73 | current->blocked = set; | |
74 | recalc_sigpending(); | |
75 | spin_unlock_irq(¤t->sighand->siglock); | |
76 | } | |
77 | if (test_thread_flag(TIF_32BIT)) { | |
78 | pc &= 0xffffffff; | |
79 | npc &= 0xffffffff; | |
80 | } | |
81 | regs->tpc = pc; | |
82 | regs->tnpc = npc; | |
83 | err |= __get_user(regs->y, &((*grp)[MC_Y])); | |
84 | err |= __get_user(tstate, &((*grp)[MC_TSTATE])); | |
85 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); | |
86 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); | |
87 | err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); | |
88 | err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); | |
89 | err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); | |
90 | err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); | |
91 | err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); | |
92 | err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); | |
0a4949c4 DM |
93 | |
94 | /* Skip %g7 as that's the thread register in userspace. */ | |
95 | ||
1da177e4 LT |
96 | err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); |
97 | err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); | |
98 | err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); | |
99 | err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); | |
100 | err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); | |
101 | err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); | |
102 | err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); | |
103 | err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); | |
104 | ||
105 | err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); | |
106 | err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); | |
107 | err |= __put_user(fp, | |
108 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); | |
109 | err |= __put_user(i7, | |
110 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); | |
111 | ||
112 | err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); | |
113 | if (fenab) { | |
114 | unsigned long *fpregs = current_thread_info()->fpregs; | |
115 | unsigned long fprs; | |
116 | ||
117 | fprs_write(0); | |
118 | err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); | |
119 | if (fprs & FPRS_DL) | |
120 | err |= copy_from_user(fpregs, | |
121 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), | |
122 | (sizeof(unsigned int) * 32)); | |
123 | if (fprs & FPRS_DU) | |
124 | err |= copy_from_user(fpregs+16, | |
125 | ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, | |
126 | (sizeof(unsigned int) * 32)); | |
127 | err |= __get_user(current_thread_info()->xfsr[0], | |
128 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); | |
129 | err |= __get_user(current_thread_info()->gsr[0], | |
130 | &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); | |
131 | regs->tstate &= ~TSTATE_PEF; | |
132 | } | |
133 | if (err) | |
134 | goto do_sigsegv; | |
135 | ||
136 | return; | |
137 | do_sigsegv: | |
138 | force_sig(SIGSEGV, current); | |
139 | } | |
140 | ||
141 | asmlinkage void sparc64_get_context(struct pt_regs *regs) | |
142 | { | |
143 | struct ucontext __user *ucp = (struct ucontext __user *) | |
144 | regs->u_regs[UREG_I0]; | |
145 | mc_gregset_t __user *grp; | |
146 | mcontext_t __user *mcp; | |
147 | unsigned long fp, i7; | |
148 | unsigned char fenab; | |
149 | int err; | |
150 | ||
151 | synchronize_user_stack(); | |
152 | if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) | |
153 | goto do_sigsegv; | |
154 | ||
155 | #if 1 | |
156 | fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ | |
157 | #else | |
158 | fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); | |
159 | #endif | |
160 | ||
161 | mcp = &ucp->uc_mcontext; | |
162 | grp = &mcp->mc_gregs; | |
163 | ||
164 | /* Skip over the trap instruction, first. */ | |
165 | if (test_thread_flag(TIF_32BIT)) { | |
166 | regs->tpc = (regs->tnpc & 0xffffffff); | |
167 | regs->tnpc = (regs->tnpc + 4) & 0xffffffff; | |
168 | } else { | |
169 | regs->tpc = regs->tnpc; | |
170 | regs->tnpc += 4; | |
171 | } | |
172 | err = 0; | |
173 | if (_NSIG_WORDS == 1) | |
174 | err |= __put_user(current->blocked.sig[0], | |
175 | (unsigned long __user *)&ucp->uc_sigmask); | |
176 | else | |
177 | err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, | |
178 | sizeof(sigset_t)); | |
179 | ||
180 | err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); | |
181 | err |= __put_user(regs->tpc, &((*grp)[MC_PC])); | |
182 | err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); | |
183 | err |= __put_user(regs->y, &((*grp)[MC_Y])); | |
184 | err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); | |
185 | err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); | |
186 | err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); | |
187 | err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); | |
188 | err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); | |
189 | err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); | |
190 | err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); | |
191 | err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); | |
192 | err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); | |
193 | err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); | |
194 | err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); | |
195 | err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); | |
196 | err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); | |
197 | err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); | |
198 | err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); | |
199 | ||
200 | err |= __get_user(fp, | |
201 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); | |
202 | err |= __get_user(i7, | |
203 | (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); | |
204 | err |= __put_user(fp, &(mcp->mc_fp)); | |
205 | err |= __put_user(i7, &(mcp->mc_i7)); | |
206 | ||
207 | err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); | |
208 | if (fenab) { | |
209 | unsigned long *fpregs = current_thread_info()->fpregs; | |
210 | unsigned long fprs; | |
211 | ||
212 | fprs = current_thread_info()->fpsaved[0]; | |
213 | if (fprs & FPRS_DL) | |
214 | err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, | |
215 | (sizeof(unsigned int) * 32)); | |
216 | if (fprs & FPRS_DU) | |
217 | err |= copy_to_user( | |
218 | ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, | |
219 | (sizeof(unsigned int) * 32)); | |
220 | err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); | |
221 | err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); | |
222 | err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); | |
223 | } | |
224 | if (err) | |
225 | goto do_sigsegv; | |
226 | ||
227 | return; | |
228 | do_sigsegv: | |
229 | force_sig(SIGSEGV, current); | |
230 | } | |
231 | ||
232 | struct rt_signal_frame { | |
233 | struct sparc_stackf ss; | |
234 | siginfo_t info; | |
235 | struct pt_regs regs; | |
236 | __siginfo_fpu_t __user *fpu_save; | |
237 | stack_t stack; | |
238 | sigset_t mask; | |
239 | __siginfo_fpu_t fpu_state; | |
240 | }; | |
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(); | |
9a28dbf8 DM |
253 | |
254 | set_restore_sigmask(); | |
255 | ||
2d7d5f05 | 256 | return -ERESTARTNOHAND; |
1da177e4 LT |
257 | } |
258 | ||
2d7d5f05 | 259 | asmlinkage long sys_sigpause(unsigned int set) |
1da177e4 | 260 | { |
2d7d5f05 | 261 | return _sigpause_common(set); |
1da177e4 LT |
262 | } |
263 | ||
2d7d5f05 | 264 | asmlinkage long sys_sigsuspend(old_sigset_t set) |
1da177e4 | 265 | { |
2d7d5f05 | 266 | return _sigpause_common(set); |
1da177e4 LT |
267 | } |
268 | ||
269 | static inline int | |
270 | restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
271 | { | |
272 | unsigned long *fpregs = current_thread_info()->fpregs; | |
273 | unsigned long fprs; | |
274 | int err; | |
275 | ||
276 | err = __get_user(fprs, &fpu->si_fprs); | |
277 | fprs_write(0); | |
278 | regs->tstate &= ~TSTATE_PEF; | |
279 | if (fprs & FPRS_DL) | |
280 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], | |
281 | (sizeof(unsigned int) * 32)); | |
282 | if (fprs & FPRS_DU) | |
283 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], | |
284 | (sizeof(unsigned int) * 32)); | |
285 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
286 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
287 | current_thread_info()->fpsaved[0] |= fprs; | |
288 | return err; | |
289 | } | |
290 | ||
291 | void do_rt_sigreturn(struct pt_regs *regs) | |
292 | { | |
293 | struct rt_signal_frame __user *sf; | |
294 | unsigned long tpc, tnpc, tstate; | |
295 | __siginfo_fpu_t __user *fpu_save; | |
1da177e4 | 296 | sigset_t set; |
1da177e4 LT |
297 | int err; |
298 | ||
299 | /* Always make any pending restarted system calls return -EINTR */ | |
300 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
301 | ||
302 | synchronize_user_stack (); | |
303 | sf = (struct rt_signal_frame __user *) | |
304 | (regs->u_regs [UREG_FP] + STACK_BIAS); | |
305 | ||
306 | /* 1. Make sure we are not getting garbage from the user */ | |
307 | if (((unsigned long) sf) & 3) | |
308 | goto segv; | |
309 | ||
310 | err = get_user(tpc, &sf->regs.tpc); | |
311 | err |= __get_user(tnpc, &sf->regs.tnpc); | |
312 | if (test_thread_flag(TIF_32BIT)) { | |
313 | tpc &= 0xffffffff; | |
314 | tnpc &= 0xffffffff; | |
315 | } | |
316 | err |= ((tpc | tnpc) & 3); | |
317 | ||
318 | /* 2. Restore the state */ | |
319 | err |= __get_user(regs->y, &sf->regs.y); | |
320 | err |= __get_user(tstate, &sf->regs.tstate); | |
321 | err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); | |
322 | ||
323 | /* User can only change condition codes and %asi in %tstate. */ | |
324 | regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); | |
325 | regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); | |
326 | ||
327 | err |= __get_user(fpu_save, &sf->fpu_save); | |
328 | if (fpu_save) | |
329 | err |= restore_fpu_state(regs, &sf->fpu_state); | |
330 | ||
331 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); | |
62715ec8 ON |
332 | err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf); |
333 | ||
1da177e4 LT |
334 | if (err) |
335 | goto segv; | |
62715ec8 | 336 | |
1da177e4 LT |
337 | regs->tpc = tpc; |
338 | regs->tnpc = tnpc; | |
1da177e4 | 339 | |
2678fefe | 340 | /* Prevent syscall restart. */ |
28e61036 | 341 | pt_regs_clear_syscall(regs); |
2678fefe | 342 | |
1da177e4 LT |
343 | sigdelsetmask(&set, ~_BLOCKABLE); |
344 | spin_lock_irq(¤t->sighand->siglock); | |
345 | current->blocked = set; | |
346 | recalc_sigpending(); | |
347 | spin_unlock_irq(¤t->sighand->siglock); | |
348 | return; | |
349 | segv: | |
350 | force_sig(SIGSEGV, current); | |
351 | } | |
352 | ||
353 | /* Checks if the fp is valid */ | |
354 | static int invalid_frame_pointer(void __user *fp, int fplen) | |
355 | { | |
356 | if (((unsigned long) fp) & 7) | |
357 | return 1; | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static inline int | |
362 | save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
363 | { | |
7c3cce97 | 364 | unsigned long *fpregs = current_thread_info()->fpregs; |
1da177e4 LT |
365 | unsigned long fprs; |
366 | int err = 0; | |
367 | ||
368 | fprs = current_thread_info()->fpsaved[0]; | |
369 | if (fprs & FPRS_DL) | |
370 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
371 | (sizeof(unsigned int) * 32)); | |
372 | if (fprs & FPRS_DU) | |
373 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
374 | (sizeof(unsigned int) * 32)); | |
375 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
376 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
377 | err |= __put_user(fprs, &fpu->si_fprs); | |
378 | ||
379 | return err; | |
380 | } | |
381 | ||
382 | static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) | |
383 | { | |
dc5dc7e6 | 384 | unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS; |
1da177e4 | 385 | |
dc5dc7e6 DM |
386 | /* |
387 | * If we are on the alternate signal stack and would overflow it, don't. | |
388 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
389 | */ | |
390 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) | |
391 | return (void __user *) -1L; | |
1da177e4 LT |
392 | |
393 | /* This is the X/Open sanctioned signal stack switching. */ | |
394 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
dc5dc7e6 | 395 | if (sas_ss_flags(sp) == 0) |
1da177e4 LT |
396 | sp = current->sas_ss_sp + current->sas_ss_size; |
397 | } | |
dc5dc7e6 DM |
398 | |
399 | /* Always align the stack frame. This handles two cases. First, | |
400 | * sigaltstack need not be mindful of platform specific stack | |
401 | * alignment. Second, if we took this signal because the stack | |
402 | * is not aligned properly, we'd like to take the signal cleanly | |
403 | * and report that. | |
404 | */ | |
405 | sp &= ~7UL; | |
406 | ||
1da177e4 LT |
407 | return (void __user *)(sp - framesize); |
408 | } | |
409 | ||
410 | static inline void | |
411 | setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
412 | int signo, sigset_t *oldset, siginfo_t *info) | |
413 | { | |
414 | struct rt_signal_frame __user *sf; | |
415 | int sigframe_size, err; | |
416 | ||
417 | /* 1. Make sure everything is clean */ | |
418 | synchronize_user_stack(); | |
419 | save_and_clear_fpu(); | |
420 | ||
7cf06995 | 421 | sigframe_size = sizeof(struct rt_signal_frame); |
1da177e4 LT |
422 | if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) |
423 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
424 | ||
425 | sf = (struct rt_signal_frame __user *) | |
426 | get_sigframe(ka, regs, sigframe_size); | |
427 | ||
428 | if (invalid_frame_pointer (sf, sigframe_size)) | |
429 | goto sigill; | |
430 | ||
431 | if (get_thread_wsaved() != 0) | |
432 | goto sigill; | |
433 | ||
434 | /* 2. Save the current process state */ | |
435 | err = copy_to_user(&sf->regs, regs, sizeof (*regs)); | |
436 | ||
437 | if (current_thread_info()->fpsaved[0] & FPRS_FEF) { | |
438 | err |= save_fpu_state(regs, &sf->fpu_state); | |
439 | err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); | |
440 | } else { | |
441 | err |= __put_user(0, &sf->fpu_save); | |
442 | } | |
443 | ||
444 | /* Setup sigaltstack */ | |
445 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
446 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
447 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
448 | ||
449 | err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); | |
450 | ||
451 | err |= copy_in_user((u64 __user *)sf, | |
452 | (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS), | |
453 | sizeof(struct reg_window)); | |
454 | ||
455 | if (info) | |
456 | err |= copy_siginfo_to_user(&sf->info, info); | |
457 | else { | |
458 | err |= __put_user(signo, &sf->info.si_signo); | |
459 | err |= __put_user(SI_NOINFO, &sf->info.si_code); | |
460 | } | |
461 | if (err) | |
462 | goto sigsegv; | |
463 | ||
464 | /* 3. signal handler back-trampoline and parameters */ | |
465 | regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; | |
466 | regs->u_regs[UREG_I0] = signo; | |
467 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
468 | ||
469 | /* The sigcontext is passed in this way because of how it | |
470 | * is defined in GLIBC's /usr/include/bits/sigcontext.h | |
471 | * for sparc64. It includes the 128 bytes of siginfo_t. | |
472 | */ | |
473 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
474 | ||
475 | /* 5. signal handler */ | |
476 | regs->tpc = (unsigned long) ka->sa.sa_handler; | |
477 | regs->tnpc = (regs->tpc + 4); | |
478 | if (test_thread_flag(TIF_32BIT)) { | |
479 | regs->tpc &= 0xffffffff; | |
480 | regs->tnpc &= 0xffffffff; | |
481 | } | |
482 | /* 4. return to kernel instructions */ | |
483 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
484 | return; | |
485 | ||
486 | sigill: | |
487 | do_exit(SIGILL); | |
488 | sigsegv: | |
489 | force_sigsegv(signo, current); | |
490 | } | |
491 | ||
492 | static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, | |
493 | siginfo_t *info, | |
494 | sigset_t *oldset, struct pt_regs *regs) | |
495 | { | |
496 | setup_rt_frame(ka, regs, signr, oldset, | |
497 | (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); | |
69be8f18 SR |
498 | spin_lock_irq(¤t->sighand->siglock); |
499 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
500 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 501 | sigaddset(¤t->blocked,signr); |
69be8f18 SR |
502 | recalc_sigpending(); |
503 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
504 | } |
505 | ||
506 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
28e61036 | 507 | struct sigaction *sa) |
1da177e4 LT |
508 | { |
509 | switch (regs->u_regs[UREG_I0]) { | |
510 | case ERESTART_RESTARTBLOCK: | |
511 | case ERESTARTNOHAND: | |
512 | no_system_call_restart: | |
513 | regs->u_regs[UREG_I0] = EINTR; | |
514 | regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); | |
515 | break; | |
516 | case ERESTARTSYS: | |
517 | if (!(sa->sa_flags & SA_RESTART)) | |
518 | goto no_system_call_restart; | |
519 | /* fallthrough */ | |
520 | case ERESTARTNOINTR: | |
521 | regs->u_regs[UREG_I0] = orig_i0; | |
522 | regs->tpc -= 4; | |
523 | regs->tnpc -= 4; | |
524 | } | |
525 | } | |
526 | ||
527 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
528 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
529 | * mistake. | |
530 | */ | |
238468b2 | 531 | static void do_signal(struct pt_regs *regs, unsigned long orig_i0) |
1da177e4 | 532 | { |
1da177e4 | 533 | struct k_sigaction ka; |
28e61036 | 534 | int restart_syscall; |
2d7d5f05 | 535 | sigset_t *oldset; |
238468b2 | 536 | siginfo_t info; |
90888816 | 537 | int signr; |
1da177e4 | 538 | |
2678fefe DM |
539 | if (pt_regs_is_syscall(regs) && |
540 | (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { | |
28e61036 | 541 | restart_syscall = 1; |
238468b2 | 542 | } else |
28e61036 | 543 | restart_syscall = 0; |
1da177e4 | 544 | |
9a28dbf8 | 545 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
2d7d5f05 DM |
546 | oldset = ¤t->saved_sigmask; |
547 | else | |
1da177e4 LT |
548 | oldset = ¤t->blocked; |
549 | ||
09337f50 | 550 | #ifdef CONFIG_COMPAT |
1da177e4 | 551 | if (test_thread_flag(TIF_32BIT)) { |
2d7d5f05 | 552 | extern void do_signal32(sigset_t *, struct pt_regs *, |
28e61036 DM |
553 | int restart_syscall, |
554 | unsigned long orig_i0); | |
555 | do_signal32(oldset, regs, restart_syscall, orig_i0); | |
2d7d5f05 | 556 | return; |
1da177e4 LT |
557 | } |
558 | #endif | |
559 | ||
28e61036 DM |
560 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
561 | ||
562 | /* If the debugger messes with the program counter, it clears | |
563 | * the software "in syscall" bit, directing us to not perform | |
564 | * a syscall restart. | |
565 | */ | |
566 | if (restart_syscall && !pt_regs_is_syscall(regs)) | |
567 | restart_syscall = 0; | |
568 | ||
1da177e4 | 569 | if (signr > 0) { |
28e61036 DM |
570 | if (restart_syscall) |
571 | syscall_restart(orig_i0, regs, &ka.sa); | |
1da177e4 | 572 | handle_signal(signr, &ka, &info, oldset, regs); |
2d7d5f05 | 573 | |
9a28dbf8 | 574 | /* A signal was successfully delivered; the saved |
2d7d5f05 DM |
575 | * sigmask will have been stored in the signal frame, |
576 | * and will be restored by sigreturn, so we can simply | |
9a28dbf8 | 577 | * clear the TS_RESTORE_SIGMASK flag. |
2d7d5f05 | 578 | */ |
9a28dbf8 | 579 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
95698466 RM |
580 | |
581 | tracehook_signal_handler(signr, &info, &ka, regs, 0); | |
2d7d5f05 | 582 | return; |
1da177e4 | 583 | } |
28e61036 | 584 | if (restart_syscall && |
1da177e4 LT |
585 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || |
586 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
587 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
588 | /* replay the system call when we are done */ | |
28e61036 | 589 | regs->u_regs[UREG_I0] = orig_i0; |
1da177e4 LT |
590 | regs->tpc -= 4; |
591 | regs->tnpc -= 4; | |
592 | } | |
28e61036 | 593 | if (restart_syscall && |
1da177e4 LT |
594 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { |
595 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
596 | regs->tpc -= 4; | |
597 | regs->tnpc -= 4; | |
598 | } | |
2d7d5f05 | 599 | |
9a28dbf8 | 600 | /* If there's no signal to deliver, we just put the saved sigmask |
2d7d5f05 DM |
601 | * back |
602 | */ | |
9a28dbf8 DM |
603 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
604 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
2d7d5f05 DM |
605 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
606 | } | |
1da177e4 LT |
607 | } |
608 | ||
7697daaa | 609 | void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) |
1da177e4 | 610 | { |
9a28dbf8 | 611 | if (thread_info_flags & _TIF_SIGPENDING) |
238468b2 | 612 | do_signal(regs, orig_i0); |
e35a8925 RM |
613 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
614 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
615 | tracehook_notify_resume(regs); | |
616 | } | |
1da177e4 | 617 | } |