Commit | Line | Data |
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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> | |
1da177e4 LT |
19 | #include <linux/kernel.h> |
20 | #include <linux/signal.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/ptrace.h> | |
ecf02de5 | 24 | #include <linux/tracehook.h> |
1da177e4 LT |
25 | #include <linux/unistd.h> |
26 | #include <linux/stddef.h> | |
27 | #include <linux/compat.h> | |
28 | #include <linux/elf.h> | |
1da177e4 LT |
29 | #include <asm/ucontext.h> |
30 | #include <asm/rt_sigframe.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/pgalloc.h> | |
33 | #include <asm/cacheflush.h> | |
0013a854 | 34 | #include <asm/asm-offsets.h> |
1da177e4 LT |
35 | |
36 | #ifdef CONFIG_COMPAT | |
1da177e4 LT |
37 | #include "signal32.h" |
38 | #endif | |
39 | ||
40 | #define DEBUG_SIG 0 | |
41 | #define DEBUG_SIG_LEVEL 2 | |
42 | ||
43 | #if DEBUG_SIG | |
44 | #define DBG(LEVEL, ...) \ | |
45 | ((DEBUG_SIG_LEVEL >= LEVEL) \ | |
46 | ? printk(__VA_ARGS__) : (void) 0) | |
47 | #else | |
48 | #define DBG(LEVEL, ...) | |
49 | #endif | |
50 | ||
51 | ||
52 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
53 | ||
54 | /* gcc will complain if a pointer is cast to an integer of different | |
55 | * size. If you really need to do this (and we do for an ELF32 user | |
56 | * application in an ELF64 kernel) then you have to do a cast to an | |
57 | * integer of the same size first. The A() macro accomplishes | |
58 | * this. */ | |
59 | #define A(__x) ((unsigned long)(__x)) | |
60 | ||
1da177e4 LT |
61 | /* |
62 | * Atomically swap in the new signal mask, and wait for a signal. | |
63 | */ | |
a8f44e38 | 64 | #ifdef CONFIG_64BIT |
1da177e4 LT |
65 | #include "sys32.h" |
66 | #endif | |
67 | ||
1da177e4 LT |
68 | /* |
69 | * Do a signal return - restore sigcontext. | |
70 | */ | |
71 | ||
72 | /* Trampoline for calling rt_sigreturn() */ | |
73 | #define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */ | |
74 | #define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */ | |
75 | #define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */ | |
76 | #define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */ | |
77 | #define INSN_NOP 0x08000240 /* nop */ | |
78 | /* For debugging */ | |
79 | #define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */ | |
80 | ||
81 | static long | |
82 | restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs) | |
83 | { | |
84 | long err = 0; | |
85 | ||
86 | err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr)); | |
87 | err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); | |
88 | err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq)); | |
89 | err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq)); | |
90 | err |= __get_user(regs->sar, &sc->sc_sar); | |
91 | DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n", | |
92 | regs->iaoq[0],regs->iaoq[1]); | |
93 | DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]); | |
94 | return err; | |
95 | } | |
96 | ||
97 | void | |
98 | sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) | |
99 | { | |
100 | struct rt_sigframe __user *frame; | |
1da177e4 LT |
101 | sigset_t set; |
102 | unsigned long usp = (regs->gr[30] & ~(0x01UL)); | |
103 | unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE; | |
a8f44e38 | 104 | #ifdef CONFIG_64BIT |
1da177e4 LT |
105 | compat_sigset_t compat_set; |
106 | struct compat_rt_sigframe __user * compat_frame; | |
107 | ||
a3ea84fa | 108 | if (is_compat_task()) |
1da177e4 LT |
109 | sigframe_size = PARISC_RT_SIGFRAME_SIZE32; |
110 | #endif | |
111 | ||
112 | ||
113 | /* Unwind the user stack to get the rt_sigframe structure. */ | |
114 | frame = (struct rt_sigframe __user *) | |
115 | (usp - sigframe_size); | |
116 | DBG(2,"sys_rt_sigreturn: frame is %p\n", frame); | |
117 | ||
a8f44e38 | 118 | #ifdef CONFIG_64BIT |
1da177e4 LT |
119 | compat_frame = (struct compat_rt_sigframe __user *)frame; |
120 | ||
a3ea84fa | 121 | if (is_compat_task()) { |
1da177e4 LT |
122 | DBG(2,"sys_rt_sigreturn: ELF32 process.\n"); |
123 | if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set))) | |
124 | goto give_sigsegv; | |
125 | sigset_32to64(&set,&compat_set); | |
126 | } else | |
127 | #endif | |
128 | { | |
129 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
130 | goto give_sigsegv; | |
131 | } | |
132 | ||
133 | sigdelsetmask(&set, ~_BLOCKABLE); | |
134 | spin_lock_irq(¤t->sighand->siglock); | |
135 | current->blocked = set; | |
136 | recalc_sigpending(); | |
137 | spin_unlock_irq(¤t->sighand->siglock); | |
138 | ||
139 | /* Good thing we saved the old gr[30], eh? */ | |
a8f44e38 | 140 | #ifdef CONFIG_64BIT |
a3ea84fa | 141 | if (is_compat_task()) { |
1da177e4 LT |
142 | DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n", |
143 | &compat_frame->uc.uc_mcontext); | |
144 | // FIXME: Load upper half from register file | |
145 | if (restore_sigcontext32(&compat_frame->uc.uc_mcontext, | |
146 | &compat_frame->regs, regs)) | |
147 | goto give_sigsegv; | |
148 | DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", | |
149 | usp, &compat_frame->uc.uc_stack); | |
150 | if (do_sigaltstack32(&compat_frame->uc.uc_stack, NULL, usp) == -EFAULT) | |
151 | goto give_sigsegv; | |
152 | } else | |
153 | #endif | |
154 | { | |
155 | DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n", | |
156 | &frame->uc.uc_mcontext); | |
157 | if (restore_sigcontext(&frame->uc.uc_mcontext, regs)) | |
158 | goto give_sigsegv; | |
159 | DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", | |
160 | usp, &frame->uc.uc_stack); | |
161 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT) | |
162 | goto give_sigsegv; | |
163 | } | |
164 | ||
165 | ||
166 | ||
167 | /* If we are on the syscall path IAOQ will not be restored, and | |
168 | * if we are on the interrupt path we must not corrupt gr31. | |
169 | */ | |
170 | if (in_syscall) | |
171 | regs->gr[31] = regs->iaoq[0]; | |
172 | #if DEBUG_SIG | |
173 | DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]); | |
174 | show_regs(regs); | |
175 | #endif | |
176 | return; | |
177 | ||
178 | give_sigsegv: | |
179 | DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n"); | |
67bace72 | 180 | force_sig(SIGSEGV, current); |
1da177e4 LT |
181 | return; |
182 | } | |
183 | ||
184 | /* | |
185 | * Set up a signal frame. | |
186 | */ | |
187 | ||
188 | static inline void __user * | |
189 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
190 | { | |
191 | /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we | |
192 | don't use the parameter it doesn't matter */ | |
193 | ||
194 | DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n", | |
195 | (unsigned long)ka, sp, frame_size); | |
196 | ||
d09042da | 197 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) |
1da177e4 LT |
198 | sp = current->sas_ss_sp; /* Stacks grow up! */ |
199 | ||
200 | DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp); | |
201 | return (void __user *) sp; /* Stacks grow up. Fun. */ | |
202 | } | |
203 | ||
204 | static long | |
205 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall) | |
206 | ||
207 | { | |
208 | unsigned long flags = 0; | |
209 | long err = 0; | |
210 | ||
211 | if (on_sig_stack((unsigned long) sc)) | |
212 | flags |= PARISC_SC_FLAG_ONSTACK; | |
213 | if (in_syscall) { | |
214 | flags |= PARISC_SC_FLAG_IN_SYSCALL; | |
215 | /* regs->iaoq is undefined in the syscall return path */ | |
216 | err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]); | |
217 | err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]); | |
218 | err |= __put_user(regs->sr[3], &sc->sc_iasq[0]); | |
219 | err |= __put_user(regs->sr[3], &sc->sc_iasq[1]); | |
220 | DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n", | |
221 | regs->gr[31], regs->gr[31]+4); | |
222 | } else { | |
223 | err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq)); | |
224 | err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq)); | |
225 | DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n", | |
226 | regs->iaoq[0], regs->iaoq[1]); | |
227 | } | |
228 | ||
229 | err |= __put_user(flags, &sc->sc_flags); | |
230 | err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr)); | |
231 | err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); | |
232 | err |= __put_user(regs->sar, &sc->sc_sar); | |
233 | DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]); | |
234 | ||
235 | return err; | |
236 | } | |
237 | ||
238 | static long | |
239 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
240 | sigset_t *set, struct pt_regs *regs, int in_syscall) | |
241 | { | |
242 | struct rt_sigframe __user *frame; | |
243 | unsigned long rp, usp; | |
244 | unsigned long haddr, sigframe_size; | |
1da177e4 | 245 | int err = 0; |
a8f44e38 | 246 | #ifdef CONFIG_64BIT |
1da177e4 LT |
247 | compat_int_t compat_val; |
248 | struct compat_rt_sigframe __user * compat_frame; | |
249 | compat_sigset_t compat_set; | |
250 | #endif | |
251 | ||
252 | usp = (regs->gr[30] & ~(0x01UL)); | |
253 | /*FIXME: frame_size parameter is unused, remove it. */ | |
254 | frame = get_sigframe(ka, usp, sizeof(*frame)); | |
255 | ||
256 | DBG(1,"SETUP_RT_FRAME: START\n"); | |
257 | DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info); | |
258 | ||
259 | ||
a8f44e38 | 260 | #ifdef CONFIG_64BIT |
1da177e4 LT |
261 | |
262 | compat_frame = (struct compat_rt_sigframe __user *)frame; | |
263 | ||
a3ea84fa | 264 | if (is_compat_task()) { |
1da177e4 | 265 | DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info); |
f671c45d | 266 | err |= copy_siginfo_to_user32(&compat_frame->info, info); |
1da177e4 LT |
267 | DBG(1,"SETUP_RT_FRAME: 1\n"); |
268 | compat_val = (compat_int_t)current->sas_ss_sp; | |
269 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp); | |
270 | DBG(1,"SETUP_RT_FRAME: 2\n"); | |
271 | compat_val = (compat_int_t)current->sas_ss_size; | |
272 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_size); | |
273 | DBG(1,"SETUP_RT_FRAME: 3\n"); | |
274 | compat_val = sas_ss_flags(regs->gr[30]); | |
275 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_flags); | |
276 | DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc); | |
277 | DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext); | |
278 | err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext, | |
279 | &compat_frame->regs, regs, in_syscall); | |
280 | sigset_64to32(&compat_set,set); | |
281 | err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set)); | |
282 | } else | |
283 | #endif | |
284 | { | |
285 | DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info); | |
286 | err |= copy_siginfo_to_user(&frame->info, info); | |
287 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
288 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
289 | err |= __put_user(sas_ss_flags(regs->gr[30]), | |
290 | &frame->uc.uc_stack.ss_flags); | |
291 | DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc); | |
292 | DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext); | |
293 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall); | |
25985edc | 294 | /* FIXME: Should probably be converted as well for the compat case */ |
1da177e4 LT |
295 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
296 | } | |
297 | ||
298 | if (err) | |
299 | goto give_sigsegv; | |
300 | ||
301 | /* Set up to return from userspace. If provided, use a stub | |
302 | already in userspace. The first words of tramp are used to | |
303 | save the previous sigrestartblock trampoline that might be | |
304 | on the stack. We start the sigreturn trampoline at | |
305 | SIGRESTARTBLOCK_TRAMP+X. */ | |
306 | err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0, | |
307 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]); | |
308 | err |= __put_user(INSN_LDI_R20, | |
309 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]); | |
310 | err |= __put_user(INSN_BLE_SR2_R0, | |
311 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]); | |
312 | err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]); | |
313 | ||
314 | #if DEBUG_SIG | |
315 | /* Assert that we're flushing in the correct space... */ | |
316 | { | |
317 | int sid; | |
318 | asm ("mfsp %%sr3,%0" : "=r" (sid)); | |
319 | DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n", | |
320 | sid, frame->tramp); | |
321 | } | |
322 | #endif | |
323 | ||
324 | flush_user_dcache_range((unsigned long) &frame->tramp[0], | |
325 | (unsigned long) &frame->tramp[TRAMP_SIZE]); | |
326 | flush_user_icache_range((unsigned long) &frame->tramp[0], | |
327 | (unsigned long) &frame->tramp[TRAMP_SIZE]); | |
328 | ||
efad798b | 329 | /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP |
1da177e4 LT |
330 | * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP |
331 | * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP | |
332 | */ | |
333 | rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP]; | |
334 | ||
335 | if (err) | |
336 | goto give_sigsegv; | |
337 | ||
338 | haddr = A(ka->sa.sa_handler); | |
339 | /* The sa_handler may be a pointer to a function descriptor */ | |
a8f44e38 | 340 | #ifdef CONFIG_64BIT |
a3ea84fa | 341 | if (is_compat_task()) { |
1da177e4 LT |
342 | #endif |
343 | if (haddr & PA_PLABEL_FDESC) { | |
344 | Elf32_Fdesc fdesc; | |
345 | Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3); | |
346 | ||
347 | err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); | |
348 | ||
349 | if (err) | |
350 | goto give_sigsegv; | |
351 | ||
352 | haddr = fdesc.addr; | |
353 | regs->gr[19] = fdesc.gp; | |
354 | } | |
a8f44e38 | 355 | #ifdef CONFIG_64BIT |
1da177e4 LT |
356 | } else { |
357 | Elf64_Fdesc fdesc; | |
358 | Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3); | |
359 | ||
360 | err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); | |
361 | ||
362 | if (err) | |
363 | goto give_sigsegv; | |
364 | ||
365 | haddr = fdesc.addr; | |
366 | regs->gr[19] = fdesc.gp; | |
367 | DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n", | |
368 | haddr, regs->gr[19], in_syscall); | |
369 | } | |
370 | #endif | |
371 | ||
372 | /* The syscall return path will create IAOQ values from r31. | |
373 | */ | |
374 | sigframe_size = PARISC_RT_SIGFRAME_SIZE; | |
a8f44e38 | 375 | #ifdef CONFIG_64BIT |
a3ea84fa | 376 | if (is_compat_task()) |
1da177e4 LT |
377 | sigframe_size = PARISC_RT_SIGFRAME_SIZE32; |
378 | #endif | |
379 | if (in_syscall) { | |
380 | regs->gr[31] = haddr; | |
a8f44e38 | 381 | #ifdef CONFIG_64BIT |
df570b9c | 382 | if (!test_thread_flag(TIF_32BIT)) |
1da177e4 LT |
383 | sigframe_size |= 1; |
384 | #endif | |
385 | } else { | |
386 | unsigned long psw = USER_PSW; | |
a8f44e38 | 387 | #ifdef CONFIG_64BIT |
df570b9c | 388 | if (!test_thread_flag(TIF_32BIT)) |
1da177e4 LT |
389 | psw |= PSW_W; |
390 | #endif | |
391 | ||
392 | /* If we are singlestepping, arrange a trap to be delivered | |
393 | when we return to userspace. Note the semantics -- we | |
394 | should trap before the first insn in the handler is | |
395 | executed. Ref: | |
396 | http://sources.redhat.com/ml/gdb/2004-11/msg00245.html | |
397 | */ | |
398 | if (pa_psw(current)->r) { | |
399 | pa_psw(current)->r = 0; | |
400 | psw |= PSW_R; | |
401 | mtctl(-1, 0); | |
402 | } | |
403 | ||
404 | regs->gr[0] = psw; | |
405 | regs->iaoq[0] = haddr | 3; | |
406 | regs->iaoq[1] = regs->iaoq[0] + 4; | |
407 | } | |
408 | ||
409 | regs->gr[2] = rp; /* userland return pointer */ | |
410 | regs->gr[26] = sig; /* signal number */ | |
411 | ||
a8f44e38 | 412 | #ifdef CONFIG_64BIT |
a3ea84fa | 413 | if (is_compat_task()) { |
1da177e4 LT |
414 | regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */ |
415 | regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */ | |
416 | } else | |
417 | #endif | |
418 | { | |
419 | regs->gr[25] = A(&frame->info); /* siginfo pointer */ | |
420 | regs->gr[24] = A(&frame->uc); /* ucontext pointer */ | |
421 | } | |
422 | ||
423 | DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n", | |
424 | regs->gr[30], sigframe_size, | |
425 | regs->gr[30] + sigframe_size); | |
426 | /* Raise the user stack pointer to make a proper call frame. */ | |
427 | regs->gr[30] = (A(frame) + sigframe_size); | |
428 | ||
429 | ||
430 | DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n", | |
431 | current->comm, current->pid, frame, regs->gr[30], | |
432 | regs->iaoq[0], regs->iaoq[1], rp); | |
433 | ||
434 | return 1; | |
435 | ||
436 | give_sigsegv: | |
437 | DBG(1,"setup_rt_frame: sending SIGSEGV\n"); | |
40c72f20 | 438 | force_sigsegv(sig, current); |
1da177e4 LT |
439 | return 0; |
440 | } | |
441 | ||
442 | /* | |
443 | * OK, we're invoking a handler. | |
444 | */ | |
445 | ||
446 | static long | |
447 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, | |
448 | sigset_t *oldset, struct pt_regs *regs, int in_syscall) | |
449 | { | |
450 | DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n", | |
451 | sig, ka, info, oldset, regs); | |
452 | ||
453 | /* Set up the stack frame */ | |
454 | if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall)) | |
455 | return 0; | |
456 | ||
69be8f18 SR |
457 | spin_lock_irq(¤t->sighand->siglock); |
458 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
459 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 460 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
461 | recalc_sigpending(); |
462 | spin_unlock_irq(¤t->sighand->siglock); | |
ecf02de5 | 463 | |
22a8cdd6 KM |
464 | tracehook_signal_handler(sig, info, ka, regs, |
465 | test_thread_flag(TIF_SINGLESTEP) || | |
466 | test_thread_flag(TIF_BLOCKSTEP)); | |
ecf02de5 | 467 | |
1da177e4 LT |
468 | return 1; |
469 | } | |
470 | ||
2b163b71 KM |
471 | static inline void |
472 | syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) | |
473 | { | |
474 | /* Check the return code */ | |
475 | switch (regs->gr[28]) { | |
476 | case -ERESTART_RESTARTBLOCK: | |
477 | current_thread_info()->restart_block.fn = | |
478 | do_no_restart_syscall; | |
479 | case -ERESTARTNOHAND: | |
480 | DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); | |
481 | regs->gr[28] = -EINTR; | |
482 | break; | |
483 | ||
484 | case -ERESTARTSYS: | |
485 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
486 | DBG(1,"ERESTARTSYS: putting -EINTR\n"); | |
487 | regs->gr[28] = -EINTR; | |
488 | break; | |
489 | } | |
490 | /* fallthrough */ | |
491 | case -ERESTARTNOINTR: | |
492 | /* A syscall is just a branch, so all | |
493 | * we have to do is fiddle the return pointer. | |
494 | */ | |
495 | regs->gr[31] -= 8; /* delayed branching */ | |
496 | /* Preserve original r28. */ | |
497 | regs->gr[28] = regs->orig_r28; | |
498 | break; | |
499 | } | |
500 | } | |
501 | ||
502 | static inline void | |
503 | insert_restart_trampoline(struct pt_regs *regs) | |
504 | { | |
505 | switch(regs->gr[28]) { | |
506 | case -ERESTART_RESTARTBLOCK: { | |
507 | /* Restart the system call - no handlers present */ | |
508 | unsigned int *usp = (unsigned int *)regs->gr[30]; | |
509 | ||
510 | /* Setup a trampoline to restart the syscall | |
511 | * with __NR_restart_syscall | |
512 | * | |
513 | * 0: <return address (orig r31)> | |
514 | * 4: <2nd half for 64-bit> | |
515 | * 8: ldw 0(%sp), %r31 | |
516 | * 12: be 0x100(%sr2, %r0) | |
517 | * 16: ldi __NR_restart_syscall, %r20 | |
518 | */ | |
519 | #ifdef CONFIG_64BIT | |
520 | put_user(regs->gr[31] >> 32, &usp[0]); | |
521 | put_user(regs->gr[31] & 0xffffffff, &usp[1]); | |
522 | put_user(0x0fc010df, &usp[2]); | |
523 | #else | |
524 | put_user(regs->gr[31], &usp[0]); | |
525 | put_user(0x0fc0109f, &usp[2]); | |
526 | #endif | |
527 | put_user(0xe0008200, &usp[3]); | |
528 | put_user(0x34140000, &usp[4]); | |
529 | ||
530 | /* Stack is 64-byte aligned, and we only need | |
531 | * to flush 1 cache line. | |
532 | * Flushing one cacheline is cheap. | |
533 | * "sync" on bigger (> 4 way) boxes is not. | |
534 | */ | |
cf39cc3b KM |
535 | flush_user_dcache_range(regs->gr[30], regs->gr[30] + 4); |
536 | flush_user_icache_range(regs->gr[30], regs->gr[30] + 4); | |
2b163b71 KM |
537 | |
538 | regs->gr[31] = regs->gr[30] + 8; | |
539 | /* Preserve original r28. */ | |
540 | regs->gr[28] = regs->orig_r28; | |
541 | ||
542 | return; | |
543 | } | |
544 | case -ERESTARTNOHAND: | |
545 | case -ERESTARTSYS: | |
546 | case -ERESTARTNOINTR: { | |
547 | /* Hooray for delayed branching. We don't | |
548 | * have to restore %r20 (the system call | |
549 | * number) because it gets loaded in the delay | |
550 | * slot of the branch external instruction. | |
551 | */ | |
552 | regs->gr[31] -= 8; | |
553 | /* Preserve original r28. */ | |
554 | regs->gr[28] = regs->orig_r28; | |
555 | ||
556 | return; | |
557 | } | |
558 | default: | |
559 | break; | |
560 | } | |
561 | } | |
562 | ||
1da177e4 LT |
563 | /* |
564 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
565 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
566 | * mistake. | |
567 | * | |
568 | * We need to be able to restore the syscall arguments (r21-r26) to | |
569 | * restart syscalls. Thus, the syscall path should save them in the | |
570 | * pt_regs structure (it's okay to do so since they are caller-save | |
571 | * registers). As noted below, the syscall number gets restored for | |
572 | * us due to the magic of delayed branching. | |
573 | */ | |
4650f0a5 KM |
574 | asmlinkage void |
575 | do_signal(struct pt_regs *regs, long in_syscall) | |
1da177e4 LT |
576 | { |
577 | siginfo_t info; | |
578 | struct k_sigaction ka; | |
579 | int signr; | |
4650f0a5 | 580 | sigset_t *oldset; |
1da177e4 LT |
581 | |
582 | DBG(1,"\ndo_signal: oldset=0x%p, regs=0x%p, sr7 %#lx, in_syscall=%d\n", | |
583 | oldset, regs, regs->sr[7], in_syscall); | |
584 | ||
585 | /* Everyone else checks to see if they are in kernel mode at | |
586 | this point and exits if that's the case. I'm not sure why | |
587 | we would be called in that case, but for some reason we | |
588 | are. */ | |
589 | ||
4650f0a5 KM |
590 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
591 | oldset = ¤t->saved_sigmask; | |
592 | else | |
1da177e4 LT |
593 | oldset = ¤t->blocked; |
594 | ||
595 | DBG(1,"do_signal: oldset %08lx / %08lx\n", | |
596 | oldset->sig[0], oldset->sig[1]); | |
597 | ||
598 | ||
599 | /* May need to force signal if handle_signal failed to deliver */ | |
600 | while (1) { | |
601 | ||
602 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
603 | DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); | |
604 | ||
605 | if (signr <= 0) | |
606 | break; | |
607 | ||
608 | /* Restart a system call if necessary. */ | |
2b163b71 KM |
609 | if (in_syscall) |
610 | syscall_restart(regs, &ka); | |
611 | ||
1da177e4 LT |
612 | /* Whee! Actually deliver the signal. If the |
613 | delivery failed, we need to continue to iterate in | |
614 | this loop so we can deliver the SIGSEGV... */ | |
2b163b71 KM |
615 | if (handle_signal(signr, &info, &ka, oldset, |
616 | regs, in_syscall)) { | |
1da177e4 LT |
617 | DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n", |
618 | regs->gr[28]); | |
4650f0a5 KM |
619 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
620 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
621 | return; | |
1da177e4 LT |
622 | } |
623 | } | |
624 | /* end of while(1) looping forever if we can't force a signal */ | |
625 | ||
626 | /* Did we come from a system call? */ | |
2b163b71 KM |
627 | if (in_syscall) |
628 | insert_restart_trampoline(regs); | |
1da177e4 LT |
629 | |
630 | DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", | |
631 | regs->gr[28]); | |
632 | ||
4650f0a5 KM |
633 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |
634 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
635 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
636 | } | |
637 | ||
638 | return; | |
639 | } | |
640 | ||
641 | void do_notify_resume(struct pt_regs *regs, long in_syscall) | |
642 | { | |
643 | if (test_thread_flag(TIF_SIGPENDING) || | |
644 | test_thread_flag(TIF_RESTORE_SIGMASK)) | |
645 | do_signal(regs, in_syscall); | |
d0420c83 DH |
646 | |
647 | if (test_thread_flag(TIF_NOTIFY_RESUME)) { | |
648 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
649 | tracehook_notify_resume(regs); | |
ee18d64c DH |
650 | if (current->replacement_session_keyring) |
651 | key_replace_session_keyring(); | |
d0420c83 | 652 | } |
1da177e4 | 653 | } |