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authorAurelien Jacquiot <a-jacquiot@ti.com>2011-10-04 11:04:34 -0400
committerMark Salter <msalter@redhat.com>2011-10-06 19:47:46 -0400
commit03a347558749caaab482f34410ae5d27e893db89 (patch)
tree4a6e2017f0afb5b82eb31d05ce2a2b539f453827 /arch
parent687b12baecae2aa3af9df05c12b90d8e9ef21fa7 (diff)
C6X: signal management
Original port to early 2.6 kernel using TI COFF toolchain. Brought up to date by Mark Salter <msalter@redhat.com> Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/c6x/include/asm/sigcontext.h80
-rw-r--r--arch/c6x/include/asm/signal.h17
-rw-r--r--arch/c6x/kernel/signal.c377
3 files changed, 474 insertions, 0 deletions
diff --git a/arch/c6x/include/asm/sigcontext.h b/arch/c6x/include/asm/sigcontext.h
new file mode 100644
index 000000000000..eb702f39cde7
--- /dev/null
+++ b/arch/c6x/include/asm/sigcontext.h
@@ -0,0 +1,80 @@
1/*
2 * Port on Texas Instruments TMS320C6x architecture
3 *
4 * Copyright (C) 2004, 2009 Texas Instruments Incorporated
5 * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#ifndef _ASM_C6X_SIGCONTEXT_H
12#define _ASM_C6X_SIGCONTEXT_H
13
14
15struct sigcontext {
16 unsigned long sc_mask; /* old sigmask */
17 unsigned long sc_sp; /* old user stack pointer */
18
19 unsigned long sc_a4;
20 unsigned long sc_b4;
21 unsigned long sc_a6;
22 unsigned long sc_b6;
23 unsigned long sc_a8;
24 unsigned long sc_b8;
25
26 unsigned long sc_a0;
27 unsigned long sc_a1;
28 unsigned long sc_a2;
29 unsigned long sc_a3;
30 unsigned long sc_a5;
31 unsigned long sc_a7;
32 unsigned long sc_a9;
33
34 unsigned long sc_b0;
35 unsigned long sc_b1;
36 unsigned long sc_b2;
37 unsigned long sc_b3;
38 unsigned long sc_b5;
39 unsigned long sc_b7;
40 unsigned long sc_b9;
41
42 unsigned long sc_a16;
43 unsigned long sc_a17;
44 unsigned long sc_a18;
45 unsigned long sc_a19;
46 unsigned long sc_a20;
47 unsigned long sc_a21;
48 unsigned long sc_a22;
49 unsigned long sc_a23;
50 unsigned long sc_a24;
51 unsigned long sc_a25;
52 unsigned long sc_a26;
53 unsigned long sc_a27;
54 unsigned long sc_a28;
55 unsigned long sc_a29;
56 unsigned long sc_a30;
57 unsigned long sc_a31;
58
59 unsigned long sc_b16;
60 unsigned long sc_b17;
61 unsigned long sc_b18;
62 unsigned long sc_b19;
63 unsigned long sc_b20;
64 unsigned long sc_b21;
65 unsigned long sc_b22;
66 unsigned long sc_b23;
67 unsigned long sc_b24;
68 unsigned long sc_b25;
69 unsigned long sc_b26;
70 unsigned long sc_b27;
71 unsigned long sc_b28;
72 unsigned long sc_b29;
73 unsigned long sc_b30;
74 unsigned long sc_b31;
75
76 unsigned long sc_csr;
77 unsigned long sc_pc;
78};
79
80#endif /* _ASM_C6X_SIGCONTEXT_H */
diff --git a/arch/c6x/include/asm/signal.h b/arch/c6x/include/asm/signal.h
new file mode 100644
index 000000000000..f1cd870596a3
--- /dev/null
+++ b/arch/c6x/include/asm/signal.h
@@ -0,0 +1,17 @@
1#ifndef _ASM_C6X_SIGNAL_H
2#define _ASM_C6X_SIGNAL_H
3
4#include <asm-generic/signal.h>
5
6#ifndef __ASSEMBLY__
7#include <linux/linkage.h>
8
9struct pt_regs;
10
11extern asmlinkage int do_rt_sigreturn(struct pt_regs *regs);
12extern asmlinkage void do_notify_resume(struct pt_regs *regs,
13 u32 thread_info_flags,
14 int syscall);
15#endif
16
17#endif /* _ASM_C6X_SIGNAL_H */
diff --git a/arch/c6x/kernel/signal.c b/arch/c6x/kernel/signal.c
new file mode 100644
index 000000000000..304f675826e9
--- /dev/null
+++ b/arch/c6x/kernel/signal.c
@@ -0,0 +1,377 @@
1/*
2 * Port on Texas Instruments TMS320C6x architecture
3 *
4 * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
5 * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
6 *
7 * Updated for 2.6.34: Mark Salter <msalter@redhat.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/kernel.h>
15#include <linux/uaccess.h>
16#include <linux/syscalls.h>
17#include <linux/tracehook.h>
18
19#include <asm/ucontext.h>
20#include <asm/cacheflush.h>
21
22
23#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
24
25/*
26 * Do a signal return, undo the signal stack.
27 */
28
29#define RETCODE_SIZE (9 << 2) /* 9 instructions = 36 bytes */
30
31struct rt_sigframe {
32 struct siginfo __user *pinfo;
33 void __user *puc;
34 struct siginfo info;
35 struct ucontext uc;
36 unsigned long retcode[RETCODE_SIZE >> 2];
37};
38
39static int restore_sigcontext(struct pt_regs *regs,
40 struct sigcontext __user *sc)
41{
42 int err = 0;
43
44 /* The access_ok check was done by caller, so use __get_user here */
45#define COPY(x) (err |= __get_user(regs->x, &sc->sc_##x))
46
47 COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
48 COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
49 COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);
50
51 COPY(a16); COPY(a17); COPY(a18); COPY(a19);
52 COPY(a20); COPY(a21); COPY(a22); COPY(a23);
53 COPY(a24); COPY(a25); COPY(a26); COPY(a27);
54 COPY(a28); COPY(a29); COPY(a30); COPY(a31);
55 COPY(b16); COPY(b17); COPY(b18); COPY(b19);
56 COPY(b20); COPY(b21); COPY(b22); COPY(b23);
57 COPY(b24); COPY(b25); COPY(b26); COPY(b27);
58 COPY(b28); COPY(b29); COPY(b30); COPY(b31);
59
60 COPY(csr); COPY(pc);
61
62#undef COPY
63
64 return err;
65}
66
67asmlinkage int do_rt_sigreturn(struct pt_regs *regs)
68{
69 struct rt_sigframe __user *frame;
70 sigset_t set;
71
72 /*
73 * Since we stacked the signal on a dword boundary,
74 * 'sp' should be dword aligned here. If it's
75 * not, then the user is trying to mess with us.
76 */
77 if (regs->sp & 7)
78 goto badframe;
79
80 frame = (struct rt_sigframe __user *) ((unsigned long) regs->sp + 8);
81
82 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
83 goto badframe;
84 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
85 goto badframe;
86
87 sigdelsetmask(&set, ~_BLOCKABLE);
88 spin_lock_irq(&current->sighand->siglock);
89 current->blocked = set;
90 recalc_sigpending();
91 spin_unlock_irq(&current->sighand->siglock);
92
93 if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
94 goto badframe;
95
96 return regs->a4;
97
98badframe:
99 force_sig(SIGSEGV, current);
100 return 0;
101}
102
103static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
104 unsigned long mask)
105{
106 int err = 0;
107
108 err |= __put_user(mask, &sc->sc_mask);
109
110 /* The access_ok check was done by caller, so use __put_user here */
111#define COPY(x) (err |= __put_user(regs->x, &sc->sc_##x))
112
113 COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
114 COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
115 COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);
116
117 COPY(a16); COPY(a17); COPY(a18); COPY(a19);
118 COPY(a20); COPY(a21); COPY(a22); COPY(a23);
119 COPY(a24); COPY(a25); COPY(a26); COPY(a27);
120 COPY(a28); COPY(a29); COPY(a30); COPY(a31);
121 COPY(b16); COPY(b17); COPY(b18); COPY(b19);
122 COPY(b20); COPY(b21); COPY(b22); COPY(b23);
123 COPY(b24); COPY(b25); COPY(b26); COPY(b27);
124 COPY(b28); COPY(b29); COPY(b30); COPY(b31);
125
126 COPY(csr); COPY(pc);
127
128#undef COPY
129
130 return err;
131}
132
133static inline void __user *get_sigframe(struct k_sigaction *ka,
134 struct pt_regs *regs,
135 unsigned long framesize)
136{
137 unsigned long sp = regs->sp;
138
139 /*
140 * This is the X/Open sanctioned signal stack switching.
141 */
142 if ((ka->sa.sa_flags & SA_ONSTACK) && sas_ss_flags(sp) == 0)
143 sp = current->sas_ss_sp + current->sas_ss_size;
144
145 /*
146 * No matter what happens, 'sp' must be dword
147 * aligned. Otherwise, nasty things will happen
148 */
149 return (void __user *)((sp - framesize) & ~7);
150}
151
152static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
153 sigset_t *set, struct pt_regs *regs)
154{
155 struct rt_sigframe __user *frame;
156 unsigned long __user *retcode;
157 int err = 0;
158
159 frame = get_sigframe(ka, regs, sizeof(*frame));
160
161 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
162 goto segv_and_exit;
163
164 err |= __put_user(&frame->info, &frame->pinfo);
165 err |= __put_user(&frame->uc, &frame->puc);
166 err |= copy_siginfo_to_user(&frame->info, info);
167
168 /* Clear all the bits of the ucontext we don't use. */
169 err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
170
171 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
172 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
173
174 /* Set up to return from userspace */
175 retcode = (unsigned long __user *) &frame->retcode;
176
177 /* The access_ok check was done above, so use __put_user here */
178#define COPY(x) (err |= __put_user(x, retcode++))
179
180 COPY(0x0000002AUL | (__NR_rt_sigreturn << 7));
181 /* MVK __NR_rt_sigreturn,B0 */
182 COPY(0x10000000UL); /* SWE */
183 COPY(0x00006000UL); /* NOP 4 */
184 COPY(0x00006000UL); /* NOP 4 */
185 COPY(0x00006000UL); /* NOP 4 */
186 COPY(0x00006000UL); /* NOP 4 */
187 COPY(0x00006000UL); /* NOP 4 */
188 COPY(0x00006000UL); /* NOP 4 */
189 COPY(0x00006000UL); /* NOP 4 */
190
191#undef COPY
192
193 if (err)
194 goto segv_and_exit;
195
196 flush_icache_range((unsigned long) &frame->retcode,
197 (unsigned long) &frame->retcode + RETCODE_SIZE);
198
199 retcode = (unsigned long __user *) &frame->retcode;
200
201 /* Change user context to branch to signal handler */
202 regs->sp = (unsigned long) frame - 8;
203 regs->b3 = (unsigned long) retcode;
204 regs->pc = (unsigned long) ka->sa.sa_handler;
205
206 /* Give the signal number to the handler */
207 regs->a4 = signr;
208
209 /*
210 * For realtime signals we must also set the second and third
211 * arguments for the signal handler.
212 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
213 */
214 regs->b4 = (unsigned long)&frame->info;
215 regs->a6 = (unsigned long)&frame->uc;
216
217 return 0;
218
219segv_and_exit:
220 force_sigsegv(signr, current);
221 return -EFAULT;
222}
223
224static inline void
225handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
226{
227 switch (regs->a4) {
228 case -ERESTARTNOHAND:
229 if (!has_handler)
230 goto do_restart;
231 regs->a4 = -EINTR;
232 break;
233
234 case -ERESTARTSYS:
235 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
236 regs->a4 = -EINTR;
237 break;
238 }
239 /* fallthrough */
240 case -ERESTARTNOINTR:
241do_restart:
242 regs->a4 = regs->orig_a4;
243 regs->pc -= 4;
244 break;
245 }
246}
247
248/*
249 * handle the actual delivery of a signal to userspace
250 */
251static int handle_signal(int sig,
252 siginfo_t *info, struct k_sigaction *ka,
253 sigset_t *oldset, struct pt_regs *regs,
254 int syscall)
255{
256 int ret;
257
258 /* Are we from a system call? */
259 if (syscall) {
260 /* If so, check system call restarting.. */
261 switch (regs->a4) {
262 case -ERESTART_RESTARTBLOCK:
263 case -ERESTARTNOHAND:
264 regs->a4 = -EINTR;
265 break;
266
267 case -ERESTARTSYS:
268 if (!(ka->sa.sa_flags & SA_RESTART)) {
269 regs->a4 = -EINTR;
270 break;
271 }
272
273 /* fallthrough */
274 case -ERESTARTNOINTR:
275 regs->a4 = regs->orig_a4;
276 regs->pc -= 4;
277 }
278 }
279
280 /* Set up the stack frame */
281 ret = setup_rt_frame(sig, ka, info, oldset, regs);
282 if (ret == 0) {
283 spin_lock_irq(&current->sighand->siglock);
284 sigorsets(&current->blocked, &current->blocked,
285 &ka->sa.sa_mask);
286 if (!(ka->sa.sa_flags & SA_NODEFER))
287 sigaddset(&current->blocked, sig);
288 recalc_sigpending();
289 spin_unlock_irq(&current->sighand->siglock);
290 }
291
292 return ret;
293}
294
295/*
296 * handle a potential signal
297 */
298static void do_signal(struct pt_regs *regs, int syscall)
299{
300 struct k_sigaction ka;
301 siginfo_t info;
302 sigset_t *oldset;
303 int signr;
304
305 /* we want the common case to go fast, which is why we may in certain
306 * cases get here from kernel mode */
307 if (!user_mode(regs))
308 return;
309
310 if (test_thread_flag(TIF_RESTORE_SIGMASK))
311 oldset = &current->saved_sigmask;
312 else
313 oldset = &current->blocked;
314
315 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
316 if (signr > 0) {
317 if (handle_signal(signr, &info, &ka, oldset,
318 regs, syscall) == 0) {
319 /* a signal was successfully delivered; the saved
320 * sigmask will have been stored in the signal frame,
321 * and will be restored by sigreturn, so we can simply
322 * clear the TIF_RESTORE_SIGMASK flag */
323 if (test_thread_flag(TIF_RESTORE_SIGMASK))
324 clear_thread_flag(TIF_RESTORE_SIGMASK);
325
326 tracehook_signal_handler(signr, &info, &ka, regs, 0);
327 }
328
329 return;
330 }
331
332 /* did we come from a system call? */
333 if (syscall) {
334 /* restart the system call - no handlers present */
335 switch (regs->a4) {
336 case -ERESTARTNOHAND:
337 case -ERESTARTSYS:
338 case -ERESTARTNOINTR:
339 regs->a4 = regs->orig_a4;
340 regs->pc -= 4;
341 break;
342
343 case -ERESTART_RESTARTBLOCK:
344 regs->a4 = regs->orig_a4;
345 regs->b0 = __NR_restart_syscall;
346 regs->pc -= 4;
347 break;
348 }
349 }
350
351 /* if there's no signal to deliver, we just put the saved sigmask
352 * back */
353 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
354 clear_thread_flag(TIF_RESTORE_SIGMASK);
355 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
356 }
357}
358
359/*
360 * notification of userspace execution resumption
361 * - triggered by current->work.notify_resume
362 */
363asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags,
364 int syscall)
365{
366 /* deal with pending signal delivery */
367 if (thread_info_flags & ((1 << TIF_SIGPENDING) |
368 (1 << TIF_RESTORE_SIGMASK)))
369 do_signal(regs, syscall);
370
371 if (thread_info_flags & (1 << TIF_NOTIFY_RESUME)) {
372 clear_thread_flag(TIF_NOTIFY_RESUME);
373 tracehook_notify_resume(regs);
374 if (current->replacement_session_keyring)
375 key_replace_session_keyring();
376 }
377}
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