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1da177e4 LT |
1 | /* |
2 | * linux/arch/parisc/kernel/signal.c: Architecture-specific signal | |
3 | * handling support. | |
4 | * | |
5 | * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org> | |
6 | * Copyright (C) 2000 Linuxcare, Inc. | |
7 | * | |
8 | * Based on the ia64, i386, and alpha versions. | |
9 | * | |
10 | * Like the IA-64, we are a recent enough port (we are *starting* | |
11 | * with glibc2.2) that we do not need to support the old non-realtime | |
12 | * Linux signals. Therefore we don't. HP/UX signals will go in | |
13 | * arch/parisc/hpux/signal.c when we figure out how to do them. | |
14 | */ | |
15 | ||
16 | #include <linux/sched.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/smp_lock.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/signal.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/wait.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/unistd.h> | |
26 | #include <linux/stddef.h> | |
27 | #include <linux/compat.h> | |
28 | #include <linux/elf.h> | |
29 | #include <linux/personality.h> | |
30 | #include <asm/ucontext.h> | |
31 | #include <asm/rt_sigframe.h> | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/pgalloc.h> | |
34 | #include <asm/cacheflush.h> | |
0013a854 | 35 | #include <asm/asm-offsets.h> |
1da177e4 LT |
36 | |
37 | #ifdef CONFIG_COMPAT | |
38 | #include <linux/compat.h> | |
39 | #include "signal32.h" | |
40 | #endif | |
41 | ||
42 | #define DEBUG_SIG 0 | |
43 | #define DEBUG_SIG_LEVEL 2 | |
44 | ||
45 | #if DEBUG_SIG | |
46 | #define DBG(LEVEL, ...) \ | |
47 | ((DEBUG_SIG_LEVEL >= LEVEL) \ | |
48 | ? printk(__VA_ARGS__) : (void) 0) | |
49 | #else | |
50 | #define DBG(LEVEL, ...) | |
51 | #endif | |
52 | ||
53 | ||
54 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
55 | ||
56 | /* gcc will complain if a pointer is cast to an integer of different | |
57 | * size. If you really need to do this (and we do for an ELF32 user | |
58 | * application in an ELF64 kernel) then you have to do a cast to an | |
59 | * integer of the same size first. The A() macro accomplishes | |
60 | * this. */ | |
61 | #define A(__x) ((unsigned long)(__x)) | |
62 | ||
63 | int do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall); | |
64 | ||
65 | /* | |
66 | * Atomically swap in the new signal mask, and wait for a signal. | |
67 | */ | |
68 | #ifdef __LP64__ | |
69 | #include "sys32.h" | |
70 | #endif | |
71 | ||
72 | asmlinkage int | |
73 | sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs) | |
74 | { | |
75 | sigset_t saveset, newset; | |
76 | #ifdef __LP64__ | |
77 | compat_sigset_t newset32; | |
78 | ||
79 | if(personality(current->personality) == PER_LINUX32){ | |
80 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
81 | if (sigsetsize != sizeof(compat_sigset_t)) | |
82 | return -EINVAL; | |
83 | if (copy_from_user(&newset32, (compat_sigset_t __user *)unewset, sizeof(newset32))) | |
84 | return -EFAULT; | |
85 | sigset_32to64(&newset,&newset32); | |
86 | ||
87 | } else | |
88 | #endif | |
89 | { | |
90 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
91 | if (sigsetsize != sizeof(sigset_t)) | |
92 | return -EINVAL; | |
93 | ||
94 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
95 | return -EFAULT; | |
96 | } | |
97 | ||
98 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
99 | ||
100 | spin_lock_irq(¤t->sighand->siglock); | |
101 | saveset = current->blocked; | |
102 | current->blocked = newset; | |
103 | recalc_sigpending(); | |
104 | spin_unlock_irq(¤t->sighand->siglock); | |
105 | ||
106 | regs->gr[28] = -EINTR; | |
107 | while (1) { | |
108 | current->state = TASK_INTERRUPTIBLE; | |
109 | schedule(); | |
110 | if (do_signal(&saveset, regs, 1)) | |
111 | return -EINTR; | |
112 | } | |
113 | } | |
114 | ||
115 | /* | |
116 | * Do a signal return - restore sigcontext. | |
117 | */ | |
118 | ||
119 | /* Trampoline for calling rt_sigreturn() */ | |
120 | #define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */ | |
121 | #define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */ | |
122 | #define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */ | |
123 | #define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */ | |
124 | #define INSN_NOP 0x08000240 /* nop */ | |
125 | /* For debugging */ | |
126 | #define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */ | |
127 | ||
128 | static long | |
129 | restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs) | |
130 | { | |
131 | long err = 0; | |
132 | ||
133 | err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr)); | |
134 | err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); | |
135 | err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq)); | |
136 | err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq)); | |
137 | err |= __get_user(regs->sar, &sc->sc_sar); | |
138 | DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n", | |
139 | regs->iaoq[0],regs->iaoq[1]); | |
140 | DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]); | |
141 | return err; | |
142 | } | |
143 | ||
144 | void | |
145 | sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) | |
146 | { | |
147 | struct rt_sigframe __user *frame; | |
148 | struct siginfo si; | |
149 | sigset_t set; | |
150 | unsigned long usp = (regs->gr[30] & ~(0x01UL)); | |
151 | unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE; | |
152 | #ifdef __LP64__ | |
153 | compat_sigset_t compat_set; | |
154 | struct compat_rt_sigframe __user * compat_frame; | |
155 | ||
156 | if(personality(current->personality) == PER_LINUX32) | |
157 | sigframe_size = PARISC_RT_SIGFRAME_SIZE32; | |
158 | #endif | |
159 | ||
160 | ||
161 | /* Unwind the user stack to get the rt_sigframe structure. */ | |
162 | frame = (struct rt_sigframe __user *) | |
163 | (usp - sigframe_size); | |
164 | DBG(2,"sys_rt_sigreturn: frame is %p\n", frame); | |
165 | ||
166 | #ifdef __LP64__ | |
167 | compat_frame = (struct compat_rt_sigframe __user *)frame; | |
168 | ||
169 | if(personality(current->personality) == PER_LINUX32){ | |
170 | DBG(2,"sys_rt_sigreturn: ELF32 process.\n"); | |
171 | if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set))) | |
172 | goto give_sigsegv; | |
173 | sigset_32to64(&set,&compat_set); | |
174 | } else | |
175 | #endif | |
176 | { | |
177 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
178 | goto give_sigsegv; | |
179 | } | |
180 | ||
181 | sigdelsetmask(&set, ~_BLOCKABLE); | |
182 | spin_lock_irq(¤t->sighand->siglock); | |
183 | current->blocked = set; | |
184 | recalc_sigpending(); | |
185 | spin_unlock_irq(¤t->sighand->siglock); | |
186 | ||
187 | /* Good thing we saved the old gr[30], eh? */ | |
188 | #ifdef __LP64__ | |
189 | if(personality(current->personality) == PER_LINUX32){ | |
190 | DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n", | |
191 | &compat_frame->uc.uc_mcontext); | |
192 | // FIXME: Load upper half from register file | |
193 | if (restore_sigcontext32(&compat_frame->uc.uc_mcontext, | |
194 | &compat_frame->regs, regs)) | |
195 | goto give_sigsegv; | |
196 | DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", | |
197 | usp, &compat_frame->uc.uc_stack); | |
198 | if (do_sigaltstack32(&compat_frame->uc.uc_stack, NULL, usp) == -EFAULT) | |
199 | goto give_sigsegv; | |
200 | } else | |
201 | #endif | |
202 | { | |
203 | DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n", | |
204 | &frame->uc.uc_mcontext); | |
205 | if (restore_sigcontext(&frame->uc.uc_mcontext, regs)) | |
206 | goto give_sigsegv; | |
207 | DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", | |
208 | usp, &frame->uc.uc_stack); | |
209 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT) | |
210 | goto give_sigsegv; | |
211 | } | |
212 | ||
213 | ||
214 | ||
215 | /* If we are on the syscall path IAOQ will not be restored, and | |
216 | * if we are on the interrupt path we must not corrupt gr31. | |
217 | */ | |
218 | if (in_syscall) | |
219 | regs->gr[31] = regs->iaoq[0]; | |
220 | #if DEBUG_SIG | |
221 | DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]); | |
222 | show_regs(regs); | |
223 | #endif | |
224 | return; | |
225 | ||
226 | give_sigsegv: | |
227 | DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n"); | |
228 | si.si_signo = SIGSEGV; | |
229 | si.si_errno = 0; | |
230 | si.si_code = SI_KERNEL; | |
231 | si.si_pid = current->pid; | |
232 | si.si_uid = current->uid; | |
233 | si.si_addr = &frame->uc; | |
234 | force_sig_info(SIGSEGV, &si, current); | |
235 | return; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Set up a signal frame. | |
240 | */ | |
241 | ||
242 | static inline void __user * | |
243 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
244 | { | |
245 | /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we | |
246 | don't use the parameter it doesn't matter */ | |
247 | ||
248 | DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n", | |
249 | (unsigned long)ka, sp, frame_size); | |
250 | ||
251 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) | |
252 | sp = current->sas_ss_sp; /* Stacks grow up! */ | |
253 | ||
254 | DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp); | |
255 | return (void __user *) sp; /* Stacks grow up. Fun. */ | |
256 | } | |
257 | ||
258 | static long | |
259 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall) | |
260 | ||
261 | { | |
262 | unsigned long flags = 0; | |
263 | long err = 0; | |
264 | ||
265 | if (on_sig_stack((unsigned long) sc)) | |
266 | flags |= PARISC_SC_FLAG_ONSTACK; | |
267 | if (in_syscall) { | |
268 | flags |= PARISC_SC_FLAG_IN_SYSCALL; | |
269 | /* regs->iaoq is undefined in the syscall return path */ | |
270 | err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]); | |
271 | err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]); | |
272 | err |= __put_user(regs->sr[3], &sc->sc_iasq[0]); | |
273 | err |= __put_user(regs->sr[3], &sc->sc_iasq[1]); | |
274 | DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n", | |
275 | regs->gr[31], regs->gr[31]+4); | |
276 | } else { | |
277 | err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq)); | |
278 | err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq)); | |
279 | DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n", | |
280 | regs->iaoq[0], regs->iaoq[1]); | |
281 | } | |
282 | ||
283 | err |= __put_user(flags, &sc->sc_flags); | |
284 | err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr)); | |
285 | err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); | |
286 | err |= __put_user(regs->sar, &sc->sc_sar); | |
287 | DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]); | |
288 | ||
289 | return err; | |
290 | } | |
291 | ||
292 | static long | |
293 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
294 | sigset_t *set, struct pt_regs *regs, int in_syscall) | |
295 | { | |
296 | struct rt_sigframe __user *frame; | |
297 | unsigned long rp, usp; | |
298 | unsigned long haddr, sigframe_size; | |
299 | struct siginfo si; | |
300 | int err = 0; | |
301 | #ifdef __LP64__ | |
302 | compat_int_t compat_val; | |
303 | struct compat_rt_sigframe __user * compat_frame; | |
304 | compat_sigset_t compat_set; | |
305 | #endif | |
306 | ||
307 | usp = (regs->gr[30] & ~(0x01UL)); | |
308 | /*FIXME: frame_size parameter is unused, remove it. */ | |
309 | frame = get_sigframe(ka, usp, sizeof(*frame)); | |
310 | ||
311 | DBG(1,"SETUP_RT_FRAME: START\n"); | |
312 | DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info); | |
313 | ||
314 | ||
315 | #ifdef __LP64__ | |
316 | ||
317 | compat_frame = (struct compat_rt_sigframe __user *)frame; | |
318 | ||
319 | if(personality(current->personality) == PER_LINUX32) { | |
320 | DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info); | |
321 | err |= compat_copy_siginfo_to_user(&compat_frame->info, info); | |
322 | DBG(1,"SETUP_RT_FRAME: 1\n"); | |
323 | compat_val = (compat_int_t)current->sas_ss_sp; | |
324 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp); | |
325 | DBG(1,"SETUP_RT_FRAME: 2\n"); | |
326 | compat_val = (compat_int_t)current->sas_ss_size; | |
327 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_size); | |
328 | DBG(1,"SETUP_RT_FRAME: 3\n"); | |
329 | compat_val = sas_ss_flags(regs->gr[30]); | |
330 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_flags); | |
331 | DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc); | |
332 | DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext); | |
333 | err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext, | |
334 | &compat_frame->regs, regs, in_syscall); | |
335 | sigset_64to32(&compat_set,set); | |
336 | err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set)); | |
337 | } else | |
338 | #endif | |
339 | { | |
340 | DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info); | |
341 | err |= copy_siginfo_to_user(&frame->info, info); | |
342 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
343 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
344 | err |= __put_user(sas_ss_flags(regs->gr[30]), | |
345 | &frame->uc.uc_stack.ss_flags); | |
346 | DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc); | |
347 | DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext); | |
348 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall); | |
349 | /* FIXME: Should probably be converted aswell for the compat case */ | |
350 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
351 | } | |
352 | ||
353 | if (err) | |
354 | goto give_sigsegv; | |
355 | ||
356 | /* Set up to return from userspace. If provided, use a stub | |
357 | already in userspace. The first words of tramp are used to | |
358 | save the previous sigrestartblock trampoline that might be | |
359 | on the stack. We start the sigreturn trampoline at | |
360 | SIGRESTARTBLOCK_TRAMP+X. */ | |
361 | err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0, | |
362 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]); | |
363 | err |= __put_user(INSN_LDI_R20, | |
364 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]); | |
365 | err |= __put_user(INSN_BLE_SR2_R0, | |
366 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]); | |
367 | err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]); | |
368 | ||
369 | #if DEBUG_SIG | |
370 | /* Assert that we're flushing in the correct space... */ | |
371 | { | |
372 | int sid; | |
373 | asm ("mfsp %%sr3,%0" : "=r" (sid)); | |
374 | DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n", | |
375 | sid, frame->tramp); | |
376 | } | |
377 | #endif | |
378 | ||
379 | flush_user_dcache_range((unsigned long) &frame->tramp[0], | |
380 | (unsigned long) &frame->tramp[TRAMP_SIZE]); | |
381 | flush_user_icache_range((unsigned long) &frame->tramp[0], | |
382 | (unsigned long) &frame->tramp[TRAMP_SIZE]); | |
383 | ||
384 | /* TRAMP Words 0-4, Lenght 5 = SIGRESTARTBLOCK_TRAMP | |
385 | * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP | |
386 | * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP | |
387 | */ | |
388 | rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP]; | |
389 | ||
390 | if (err) | |
391 | goto give_sigsegv; | |
392 | ||
393 | haddr = A(ka->sa.sa_handler); | |
394 | /* The sa_handler may be a pointer to a function descriptor */ | |
395 | #ifdef __LP64__ | |
396 | if(personality(current->personality) == PER_LINUX32) { | |
397 | #endif | |
398 | if (haddr & PA_PLABEL_FDESC) { | |
399 | Elf32_Fdesc fdesc; | |
400 | Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3); | |
401 | ||
402 | err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); | |
403 | ||
404 | if (err) | |
405 | goto give_sigsegv; | |
406 | ||
407 | haddr = fdesc.addr; | |
408 | regs->gr[19] = fdesc.gp; | |
409 | } | |
410 | #ifdef __LP64__ | |
411 | } else { | |
412 | Elf64_Fdesc fdesc; | |
413 | Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3); | |
414 | ||
415 | err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); | |
416 | ||
417 | if (err) | |
418 | goto give_sigsegv; | |
419 | ||
420 | haddr = fdesc.addr; | |
421 | regs->gr[19] = fdesc.gp; | |
422 | DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n", | |
423 | haddr, regs->gr[19], in_syscall); | |
424 | } | |
425 | #endif | |
426 | ||
427 | /* The syscall return path will create IAOQ values from r31. | |
428 | */ | |
429 | sigframe_size = PARISC_RT_SIGFRAME_SIZE; | |
430 | #ifdef __LP64__ | |
431 | if(personality(current->personality) == PER_LINUX32) | |
432 | sigframe_size = PARISC_RT_SIGFRAME_SIZE32; | |
433 | #endif | |
434 | if (in_syscall) { | |
435 | regs->gr[31] = haddr; | |
436 | #ifdef __LP64__ | |
437 | if(personality(current->personality) == PER_LINUX) | |
438 | sigframe_size |= 1; | |
439 | #endif | |
440 | } else { | |
441 | unsigned long psw = USER_PSW; | |
442 | #ifdef __LP64__ | |
443 | if(personality(current->personality) == PER_LINUX) | |
444 | psw |= PSW_W; | |
445 | #endif | |
446 | ||
447 | /* If we are singlestepping, arrange a trap to be delivered | |
448 | when we return to userspace. Note the semantics -- we | |
449 | should trap before the first insn in the handler is | |
450 | executed. Ref: | |
451 | http://sources.redhat.com/ml/gdb/2004-11/msg00245.html | |
452 | */ | |
453 | if (pa_psw(current)->r) { | |
454 | pa_psw(current)->r = 0; | |
455 | psw |= PSW_R; | |
456 | mtctl(-1, 0); | |
457 | } | |
458 | ||
459 | regs->gr[0] = psw; | |
460 | regs->iaoq[0] = haddr | 3; | |
461 | regs->iaoq[1] = regs->iaoq[0] + 4; | |
462 | } | |
463 | ||
464 | regs->gr[2] = rp; /* userland return pointer */ | |
465 | regs->gr[26] = sig; /* signal number */ | |
466 | ||
467 | #ifdef __LP64__ | |
468 | if(personality(current->personality) == PER_LINUX32){ | |
469 | regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */ | |
470 | regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */ | |
471 | } else | |
472 | #endif | |
473 | { | |
474 | regs->gr[25] = A(&frame->info); /* siginfo pointer */ | |
475 | regs->gr[24] = A(&frame->uc); /* ucontext pointer */ | |
476 | } | |
477 | ||
478 | DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n", | |
479 | regs->gr[30], sigframe_size, | |
480 | regs->gr[30] + sigframe_size); | |
481 | /* Raise the user stack pointer to make a proper call frame. */ | |
482 | regs->gr[30] = (A(frame) + sigframe_size); | |
483 | ||
484 | ||
485 | DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n", | |
486 | current->comm, current->pid, frame, regs->gr[30], | |
487 | regs->iaoq[0], regs->iaoq[1], rp); | |
488 | ||
489 | return 1; | |
490 | ||
491 | give_sigsegv: | |
492 | DBG(1,"setup_rt_frame: sending SIGSEGV\n"); | |
493 | if (sig == SIGSEGV) | |
494 | ka->sa.sa_handler = SIG_DFL; | |
495 | si.si_signo = SIGSEGV; | |
496 | si.si_errno = 0; | |
497 | si.si_code = SI_KERNEL; | |
498 | si.si_pid = current->pid; | |
499 | si.si_uid = current->uid; | |
500 | si.si_addr = frame; | |
501 | force_sig_info(SIGSEGV, &si, current); | |
502 | return 0; | |
503 | } | |
504 | ||
505 | /* | |
506 | * OK, we're invoking a handler. | |
507 | */ | |
508 | ||
509 | static long | |
510 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, | |
511 | sigset_t *oldset, struct pt_regs *regs, int in_syscall) | |
512 | { | |
513 | DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n", | |
514 | sig, ka, info, oldset, regs); | |
515 | ||
516 | /* Set up the stack frame */ | |
517 | if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall)) | |
518 | return 0; | |
519 | ||
69be8f18 SR |
520 | spin_lock_irq(¤t->sighand->siglock); |
521 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
522 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 523 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
524 | recalc_sigpending(); |
525 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
526 | return 1; |
527 | } | |
528 | ||
529 | /* | |
530 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
531 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
532 | * mistake. | |
533 | * | |
534 | * We need to be able to restore the syscall arguments (r21-r26) to | |
535 | * restart syscalls. Thus, the syscall path should save them in the | |
536 | * pt_regs structure (it's okay to do so since they are caller-save | |
537 | * registers). As noted below, the syscall number gets restored for | |
538 | * us due to the magic of delayed branching. | |
539 | */ | |
540 | ||
541 | asmlinkage int | |
542 | do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall) | |
543 | { | |
544 | siginfo_t info; | |
545 | struct k_sigaction ka; | |
546 | int signr; | |
547 | ||
548 | DBG(1,"\ndo_signal: oldset=0x%p, regs=0x%p, sr7 %#lx, in_syscall=%d\n", | |
549 | oldset, regs, regs->sr[7], in_syscall); | |
550 | ||
551 | /* Everyone else checks to see if they are in kernel mode at | |
552 | this point and exits if that's the case. I'm not sure why | |
553 | we would be called in that case, but for some reason we | |
554 | are. */ | |
555 | ||
556 | if (!oldset) | |
557 | oldset = ¤t->blocked; | |
558 | ||
559 | DBG(1,"do_signal: oldset %08lx / %08lx\n", | |
560 | oldset->sig[0], oldset->sig[1]); | |
561 | ||
562 | ||
563 | /* May need to force signal if handle_signal failed to deliver */ | |
564 | while (1) { | |
565 | ||
566 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
567 | DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); | |
568 | ||
569 | if (signr <= 0) | |
570 | break; | |
571 | ||
572 | /* Restart a system call if necessary. */ | |
573 | if (in_syscall) { | |
574 | /* Check the return code */ | |
575 | switch (regs->gr[28]) { | |
576 | case -ERESTART_RESTARTBLOCK: | |
577 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
578 | case -ERESTARTNOHAND: | |
579 | DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); | |
580 | regs->gr[28] = -EINTR; | |
581 | break; | |
582 | ||
583 | case -ERESTARTSYS: | |
584 | if (!(ka.sa.sa_flags & SA_RESTART)) { | |
585 | DBG(1,"ERESTARTSYS: putting -EINTR\n"); | |
586 | regs->gr[28] = -EINTR; | |
587 | break; | |
588 | } | |
589 | /* fallthrough */ | |
590 | case -ERESTARTNOINTR: | |
591 | /* A syscall is just a branch, so all | |
592 | we have to do is fiddle the return pointer. */ | |
593 | regs->gr[31] -= 8; /* delayed branching */ | |
594 | /* Preserve original r28. */ | |
595 | regs->gr[28] = regs->orig_r28; | |
596 | break; | |
597 | } | |
598 | } | |
599 | /* Whee! Actually deliver the signal. If the | |
600 | delivery failed, we need to continue to iterate in | |
601 | this loop so we can deliver the SIGSEGV... */ | |
602 | if (handle_signal(signr, &info, &ka, oldset, regs, in_syscall)) { | |
603 | DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n", | |
604 | regs->gr[28]); | |
605 | return 1; | |
606 | } | |
607 | } | |
608 | /* end of while(1) looping forever if we can't force a signal */ | |
609 | ||
610 | /* Did we come from a system call? */ | |
611 | if (in_syscall) { | |
612 | /* Restart the system call - no handlers present */ | |
613 | if (regs->gr[28] == -ERESTART_RESTARTBLOCK) { | |
614 | unsigned int *usp = (unsigned int *)regs->gr[30]; | |
615 | ||
616 | /* Setup a trampoline to restart the syscall | |
617 | * with __NR_restart_syscall | |
618 | * | |
619 | * 0: <return address (orig r31)> | |
620 | * 4: <2nd half for 64-bit> | |
621 | * 8: ldw 0(%sp), %r31 | |
622 | * 12: be 0x100(%sr2, %r0) | |
623 | * 16: ldi __NR_restart_syscall, %r20 | |
624 | */ | |
625 | #ifndef __LP64__ | |
626 | put_user(regs->gr[31], &usp[0]); | |
627 | put_user(0x0fc0109f, &usp[2]); | |
628 | #else | |
629 | put_user(regs->gr[31] >> 32, &usp[0]); | |
630 | put_user(regs->gr[31] & 0xffffffff, &usp[1]); | |
631 | put_user(0x0fc010df, &usp[2]); | |
632 | #endif | |
633 | put_user(0xe0008200, &usp[3]); | |
634 | put_user(0x34140000, &usp[4]); | |
635 | ||
636 | /* Stack is 64-byte aligned, and we only | |
637 | * need to flush 1 cache line */ | |
638 | asm("fdc 0(%%sr3, %0)\n" | |
639 | "fic 0(%%sr3, %0)\n" | |
640 | "sync\n" | |
641 | : : "r"(regs->gr[30])); | |
642 | ||
643 | regs->gr[31] = regs->gr[30] + 8; | |
644 | /* Preserve original r28. */ | |
645 | regs->gr[28] = regs->orig_r28; | |
646 | } else if (regs->gr[28] == -ERESTARTNOHAND || | |
647 | regs->gr[28] == -ERESTARTSYS || | |
648 | regs->gr[28] == -ERESTARTNOINTR) { | |
649 | /* Hooray for delayed branching. We don't | |
650 | have to restore %r20 (the system call | |
651 | number) because it gets loaded in the delay | |
652 | slot of the branch external instruction. */ | |
653 | regs->gr[31] -= 8; | |
654 | /* Preserve original r28. */ | |
655 | regs->gr[28] = regs->orig_r28; | |
656 | } | |
657 | } | |
658 | ||
659 | DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", | |
660 | regs->gr[28]); | |
661 | ||
662 | return 0; | |
663 | } |