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authorLey Foon Tan <lftan@altera.com>2014-11-06 02:19:59 -0500
committerLey Foon Tan <lftan@altera.com>2014-12-07 23:55:59 -0500
commitb53e906d255d7bc3539c2729afb8a18c309cd41e (patch)
tree2cd954b17aad5bdf540e23023e82d6ca2871c361 /arch/nios2
parent1000197d801329804d30094aef5dba0265204d17 (diff)
nios2: Signal handling support
This patch adds support for signal handling. Signed-off-by: Ley Foon Tan <lftan@altera.com>
Diffstat (limited to 'arch/nios2')
-rw-r--r--arch/nios2/include/asm/signal.h22
-rw-r--r--arch/nios2/include/asm/ucontext.h32
-rw-r--r--arch/nios2/include/uapi/asm/sigcontext.h28
-rw-r--r--arch/nios2/include/uapi/asm/signal.h23
-rw-r--r--arch/nios2/kernel/signal.c323
5 files changed, 428 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/signal.h b/arch/nios2/include/asm/signal.h
new file mode 100644
index 000000000000..bbcf11eecb01
--- /dev/null
+++ b/arch/nios2/include/asm/signal.h
@@ -0,0 +1,22 @@
1/*
2 * Copyright Altera Corporation (C) 2013. All rights reserved
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 */
17#ifndef _NIOS2_SIGNAL_H
18#define _NIOS2_SIGNAL_H
19
20#include <uapi/asm/signal.h>
21
22#endif /* _NIOS2_SIGNAL_H */
diff --git a/arch/nios2/include/asm/ucontext.h b/arch/nios2/include/asm/ucontext.h
new file mode 100644
index 000000000000..2c87614b0f6e
--- /dev/null
+++ b/arch/nios2/include/asm/ucontext.h
@@ -0,0 +1,32 @@
1/*
2 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
3 * Copyright (C) 2004 Microtronix Datacom Ltd
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9
10#ifndef _ASM_NIOS2_UCONTEXT_H
11#define _ASM_NIOS2_UCONTEXT_H
12
13typedef int greg_t;
14#define NGREG 32
15typedef greg_t gregset_t[NGREG];
16
17struct mcontext {
18 int version;
19 gregset_t gregs;
20};
21
22#define MCONTEXT_VERSION 2
23
24struct ucontext {
25 unsigned long uc_flags;
26 struct ucontext *uc_link;
27 stack_t uc_stack;
28 struct mcontext uc_mcontext;
29 sigset_t uc_sigmask; /* mask last for extensibility */
30};
31
32#endif
diff --git a/arch/nios2/include/uapi/asm/sigcontext.h b/arch/nios2/include/uapi/asm/sigcontext.h
new file mode 100644
index 000000000000..7b8bb41867d4
--- /dev/null
+++ b/arch/nios2/include/uapi/asm/sigcontext.h
@@ -0,0 +1,28 @@
1/*
2 * Copyright (C) 2004, Microtronix Datacom Ltd.
3 *
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
15 * details.
16 */
17
18#ifndef _ASM_NIOS2_SIGCONTEXT_H
19#define _ASM_NIOS2_SIGCONTEXT_H
20
21#include <asm/ptrace.h>
22
23struct sigcontext {
24 struct pt_regs regs;
25 unsigned long sc_mask; /* old sigmask */
26};
27
28#endif
diff --git a/arch/nios2/include/uapi/asm/signal.h b/arch/nios2/include/uapi/asm/signal.h
new file mode 100644
index 000000000000..f29ee6314481
--- /dev/null
+++ b/arch/nios2/include/uapi/asm/signal.h
@@ -0,0 +1,23 @@
1/*
2 * Copyright Altera Corporation (C) 2013. All rights reserved
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 */
17#ifndef _ASM_NIOS2_SIGNAL_H
18#define _ASM_NIOS2_SIGNAL_H
19
20#define SA_RESTORER 0x04000000
21#include <asm-generic/signal.h>
22
23#endif /* _ASM_NIOS2_SIGNAL_H */
diff --git a/arch/nios2/kernel/signal.c b/arch/nios2/kernel/signal.c
new file mode 100644
index 000000000000..f9d27883a714
--- /dev/null
+++ b/arch/nios2/kernel/signal.c
@@ -0,0 +1,323 @@
1/*
2 * Copyright (C) 2013-2014 Altera Corporation
3 * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>
4 * Copyright (C) 2004 Microtronix Datacom Ltd
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive
9 * for more details.
10 */
11
12#include <linux/signal.h>
13#include <linux/errno.h>
14#include <linux/ptrace.h>
15#include <linux/uaccess.h>
16#include <linux/unistd.h>
17#include <linux/personality.h>
18#include <linux/tracehook.h>
19
20#include <asm/ucontext.h>
21#include <asm/cacheflush.h>
22
23#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
24
25/*
26 * Do a signal return; undo the signal stack.
27 *
28 * Keep the return code on the stack quadword aligned!
29 * That makes the cache flush below easier.
30 */
31
32struct rt_sigframe {
33 struct siginfo info;
34 struct ucontext uc;
35};
36
37static inline int rt_restore_ucontext(struct pt_regs *regs,
38 struct switch_stack *sw,
39 struct ucontext *uc, int *pr2)
40{
41 int temp;
42 greg_t *gregs = uc->uc_mcontext.gregs;
43 int err;
44
45 /* Always make any pending restarted system calls return -EINTR */
46 current_thread_info()->restart_block.fn = do_no_restart_syscall;
47
48 err = __get_user(temp, &uc->uc_mcontext.version);
49 if (temp != MCONTEXT_VERSION)
50 goto badframe;
51 /* restore passed registers */
52 err |= __get_user(regs->r1, &gregs[0]);
53 err |= __get_user(regs->r2, &gregs[1]);
54 err |= __get_user(regs->r3, &gregs[2]);
55 err |= __get_user(regs->r4, &gregs[3]);
56 err |= __get_user(regs->r5, &gregs[4]);
57 err |= __get_user(regs->r6, &gregs[5]);
58 err |= __get_user(regs->r7, &gregs[6]);
59 err |= __get_user(regs->r8, &gregs[7]);
60 err |= __get_user(regs->r9, &gregs[8]);
61 err |= __get_user(regs->r10, &gregs[9]);
62 err |= __get_user(regs->r11, &gregs[10]);
63 err |= __get_user(regs->r12, &gregs[11]);
64 err |= __get_user(regs->r13, &gregs[12]);
65 err |= __get_user(regs->r14, &gregs[13]);
66 err |= __get_user(regs->r15, &gregs[14]);
67 err |= __get_user(sw->r16, &gregs[15]);
68 err |= __get_user(sw->r17, &gregs[16]);
69 err |= __get_user(sw->r18, &gregs[17]);
70 err |= __get_user(sw->r19, &gregs[18]);
71 err |= __get_user(sw->r20, &gregs[19]);
72 err |= __get_user(sw->r21, &gregs[20]);
73 err |= __get_user(sw->r22, &gregs[21]);
74 err |= __get_user(sw->r23, &gregs[22]);
75 /* gregs[23] is handled below */
76 err |= __get_user(sw->fp, &gregs[24]); /* Verify, should this be
77 settable */
78 err |= __get_user(sw->gp, &gregs[25]); /* Verify, should this be
79 settable */
80
81 err |= __get_user(temp, &gregs[26]); /* Not really necessary no user
82 settable bits */
83 err |= __get_user(regs->ea, &gregs[27]);
84
85 err |= __get_user(regs->ra, &gregs[23]);
86 err |= __get_user(regs->sp, &gregs[28]);
87
88 regs->orig_r2 = -1; /* disable syscall checks */
89
90 err |= restore_altstack(&uc->uc_stack);
91 if (err)
92 goto badframe;
93
94 *pr2 = regs->r2;
95 return err;
96
97badframe:
98 return 1;
99}
100
101asmlinkage int do_rt_sigreturn(struct switch_stack *sw)
102{
103 struct pt_regs *regs = (struct pt_regs *)(sw + 1);
104 /* Verify, can we follow the stack back */
105 struct rt_sigframe *frame = (struct rt_sigframe *) regs->sp;
106 sigset_t set;
107 int rval;
108
109 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
110 goto badframe;
111
112 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
113 goto badframe;
114
115 set_current_blocked(&set);
116
117 if (rt_restore_ucontext(regs, sw, &frame->uc, &rval))
118 goto badframe;
119
120 return rval;
121
122badframe:
123 force_sig(SIGSEGV, current);
124 return 0;
125}
126
127static inline int rt_setup_ucontext(struct ucontext *uc, struct pt_regs *regs)
128{
129 struct switch_stack *sw = (struct switch_stack *)regs - 1;
130 greg_t *gregs = uc->uc_mcontext.gregs;
131 int err = 0;
132
133 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
134 err |= __put_user(regs->r1, &gregs[0]);
135 err |= __put_user(regs->r2, &gregs[1]);
136 err |= __put_user(regs->r3, &gregs[2]);
137 err |= __put_user(regs->r4, &gregs[3]);
138 err |= __put_user(regs->r5, &gregs[4]);
139 err |= __put_user(regs->r6, &gregs[5]);
140 err |= __put_user(regs->r7, &gregs[6]);
141 err |= __put_user(regs->r8, &gregs[7]);
142 err |= __put_user(regs->r9, &gregs[8]);
143 err |= __put_user(regs->r10, &gregs[9]);
144 err |= __put_user(regs->r11, &gregs[10]);
145 err |= __put_user(regs->r12, &gregs[11]);
146 err |= __put_user(regs->r13, &gregs[12]);
147 err |= __put_user(regs->r14, &gregs[13]);
148 err |= __put_user(regs->r15, &gregs[14]);
149 err |= __put_user(sw->r16, &gregs[15]);
150 err |= __put_user(sw->r17, &gregs[16]);
151 err |= __put_user(sw->r18, &gregs[17]);
152 err |= __put_user(sw->r19, &gregs[18]);
153 err |= __put_user(sw->r20, &gregs[19]);
154 err |= __put_user(sw->r21, &gregs[20]);
155 err |= __put_user(sw->r22, &gregs[21]);
156 err |= __put_user(sw->r23, &gregs[22]);
157 err |= __put_user(regs->ra, &gregs[23]);
158 err |= __put_user(sw->fp, &gregs[24]);
159 err |= __put_user(sw->gp, &gregs[25]);
160 err |= __put_user(regs->ea, &gregs[27]);
161 err |= __put_user(regs->sp, &gregs[28]);
162 return err;
163}
164
165static inline void *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
166 size_t frame_size)
167{
168 unsigned long usp;
169
170 /* Default to using normal stack. */
171 usp = regs->sp;
172
173 /* This is the X/Open sanctioned signal stack switching. */
174 usp = sigsp(usp, ksig);
175
176 /* Verify, is it 32 or 64 bit aligned */
177 return (void *)((usp - frame_size) & -8UL);
178}
179
180static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
181 struct pt_regs *regs)
182{
183 struct rt_sigframe *frame;
184 int err = 0;
185
186 frame = get_sigframe(ksig, regs, sizeof(*frame));
187
188 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
189 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
190
191 /* Create the ucontext. */
192 err |= __put_user(0, &frame->uc.uc_flags);
193 err |= __put_user(0, &frame->uc.uc_link);
194 err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
195 err |= rt_setup_ucontext(&frame->uc, regs);
196 err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
197
198 if (err)
199 goto give_sigsegv;
200
201 /* Set up to return from userspace; jump to fixed address sigreturn
202 trampoline on kuser page. */
203 regs->ra = (unsigned long) (0x1040);
204
205 /* Set up registers for signal handler */
206 regs->sp = (unsigned long) frame;
207 regs->r4 = (unsigned long) ksig->sig;
208 regs->r5 = (unsigned long) &frame->info;
209 regs->r6 = (unsigned long) &frame->uc;
210 regs->ea = (unsigned long) ksig->ka.sa.sa_handler;
211 return 0;
212
213give_sigsegv:
214 force_sigsegv(ksig->sig, current);
215 return -EFAULT;
216}
217
218/*
219 * OK, we're invoking a handler
220 */
221static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
222{
223 int ret;
224 sigset_t *oldset = sigmask_to_save();
225
226 /* set up the stack frame */
227 ret = setup_rt_frame(ksig, oldset, regs);
228
229 signal_setup_done(ret, ksig, 0);
230}
231
232static int do_signal(struct pt_regs *regs)
233{
234 unsigned int retval = 0, continue_addr = 0, restart_addr = 0;
235 int restart = 0;
236 struct ksignal ksig;
237
238 current->thread.kregs = regs;
239
240 /*
241 * If we were from a system call, check for system call restarting...
242 */
243 if (regs->orig_r2 >= 0) {
244 continue_addr = regs->ea;
245 restart_addr = continue_addr - 4;
246 retval = regs->r2;
247
248 /*
249 * Prepare for system call restart. We do this here so that a
250 * debugger will see the already changed PC.
251 */
252 switch (retval) {
253 case ERESTART_RESTARTBLOCK:
254 restart = -2;
255 case ERESTARTNOHAND:
256 case ERESTARTSYS:
257 case ERESTARTNOINTR:
258 restart++;
259 regs->r2 = regs->orig_r2;
260 regs->r7 = regs->orig_r7;
261 regs->ea = restart_addr;
262 break;
263 }
264 }
265
266 if (get_signal(&ksig)) {
267 /* handler */
268 if (unlikely(restart && regs->ea == restart_addr)) {
269 if (retval == ERESTARTNOHAND ||
270 retval == ERESTART_RESTARTBLOCK ||
271 (retval == ERESTARTSYS
272 && !(ksig.ka.sa.sa_flags & SA_RESTART))) {
273 regs->r2 = EINTR;
274 regs->r7 = 1;
275 regs->ea = continue_addr;
276 }
277 }
278 handle_signal(&ksig, regs);
279 return 0;
280 }
281
282 /*
283 * No handler present
284 */
285 if (unlikely(restart) && regs->ea == restart_addr) {
286 regs->ea = continue_addr;
287 regs->r2 = __NR_restart_syscall;
288 }
289
290 /*
291 * If there's no signal to deliver, we just put the saved sigmask back.
292 */
293 restore_saved_sigmask();
294
295 return restart;
296}
297
298asmlinkage int do_notify_resume(struct pt_regs *regs)
299{
300 /*
301 * We want the common case to go fast, which is why we may in certain
302 * cases get here from kernel mode. Just return without doing anything
303 * if so.
304 */
305 if (!user_mode(regs))
306 return 0;
307
308 if (test_thread_flag(TIF_SIGPENDING)) {
309 int restart = do_signal(regs);
310
311 if (unlikely(restart)) {
312 /*
313 * Restart without handlers.
314 * Deal with it without leaving
315 * the kernel space.
316 */
317 return restart;
318 }
319 } else if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
320 tracehook_notify_resume(regs);
321
322 return 0;
323}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-26 12:08:43 -0500