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Chen Liqin6bc9a392009-06-12 22:01:00 +08001/*
2 * arch/score/kernel/signal.c
3 *
4 * Score Processor version.
5 *
6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
7 * Chen Liqin <liqin.chen@sunplusct.com>
8 * Lennox Wu <lennox.wu@sunplusct.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see the file COPYING, or write
22 * to the Free Software Foundation, Inc.,
23 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#include <linux/errno.h>
27#include <linux/signal.h>
Chen Liqind8aa8992009-08-30 12:26:32 +080028#include <linux/ptrace.h>
Chen Liqin6bc9a392009-06-12 22:01:00 +080029#include <linux/unistd.h>
30#include <linux/uaccess.h>
Al Viro1d5d4db2012-04-24 01:55:30 -040031#include <linux/tracehook.h>
Arnd Bergmann9fb24cc2009-06-27 14:50:51 +020032
Chen Liqind8aa8992009-08-30 12:26:32 +080033#include <asm/cacheflush.h>
Arnd Bergmann9fb24cc2009-06-27 14:50:51 +020034#include <asm/syscalls.h>
35#include <asm/ucontext.h>
Chen Liqin6bc9a392009-06-12 22:01:00 +080036
Chen Liqin6bc9a392009-06-12 22:01:00 +080037struct rt_sigframe {
38 u32 rs_ass[4]; /* argument save space */
39 u32 rs_code[2]; /* signal trampoline */
40 struct siginfo rs_info;
41 struct ucontext rs_uc;
42};
43
Arnd Bergmannbddc6052009-06-27 15:12:16 +020044static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
Chen Liqin6bc9a392009-06-12 22:01:00 +080045{
46 int err = 0;
47 unsigned long reg;
48
49 reg = regs->cp0_epc; err |= __put_user(reg, &sc->sc_pc);
50 err |= __put_user(regs->cp0_psr, &sc->sc_psr);
51 err |= __put_user(regs->cp0_condition, &sc->sc_condition);
52
53
54#define save_gp_reg(i) { \
55 reg = regs->regs[i]; \
56 err |= __put_user(reg, &sc->sc_regs[i]); \
57} while (0)
58 save_gp_reg(0); save_gp_reg(1); save_gp_reg(2);
59 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5);
60 save_gp_reg(6); save_gp_reg(7); save_gp_reg(8);
61 save_gp_reg(9); save_gp_reg(10); save_gp_reg(11);
62 save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
63 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17);
64 save_gp_reg(18); save_gp_reg(19); save_gp_reg(20);
65 save_gp_reg(21); save_gp_reg(22); save_gp_reg(23);
66 save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
67 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29);
68#undef save_gp_reg
69
70 reg = regs->ceh; err |= __put_user(reg, &sc->sc_mdceh);
71 reg = regs->cel; err |= __put_user(reg, &sc->sc_mdcel);
72 err |= __put_user(regs->cp0_ecr, &sc->sc_ecr);
73 err |= __put_user(regs->cp0_ema, &sc->sc_ema);
74
75 return err;
76}
77
Arnd Bergmannbddc6052009-06-27 15:12:16 +020078static int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
Chen Liqin6bc9a392009-06-12 22:01:00 +080079{
80 int err = 0;
81 u32 reg;
82
83 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
84 err |= __get_user(regs->cp0_condition, &sc->sc_condition);
85
86 err |= __get_user(reg, &sc->sc_mdceh);
87 regs->ceh = (int) reg;
88 err |= __get_user(reg, &sc->sc_mdcel);
89 regs->cel = (int) reg;
90
91 err |= __get_user(reg, &sc->sc_psr);
92 regs->cp0_psr = (int) reg;
93 err |= __get_user(reg, &sc->sc_ecr);
94 regs->cp0_ecr = (int) reg;
95 err |= __get_user(reg, &sc->sc_ema);
96 regs->cp0_ema = (int) reg;
97
98#define restore_gp_reg(i) do { \
99 err |= __get_user(reg, &sc->sc_regs[i]); \
100 regs->regs[i] = reg; \
101} while (0)
102 restore_gp_reg(0); restore_gp_reg(1); restore_gp_reg(2);
103 restore_gp_reg(3); restore_gp_reg(4); restore_gp_reg(5);
104 restore_gp_reg(6); restore_gp_reg(7); restore_gp_reg(8);
105 restore_gp_reg(9); restore_gp_reg(10); restore_gp_reg(11);
106 restore_gp_reg(12); restore_gp_reg(13); restore_gp_reg(14);
107 restore_gp_reg(15); restore_gp_reg(16); restore_gp_reg(17);
108 restore_gp_reg(18); restore_gp_reg(19); restore_gp_reg(20);
109 restore_gp_reg(21); restore_gp_reg(22); restore_gp_reg(23);
110 restore_gp_reg(24); restore_gp_reg(25); restore_gp_reg(26);
111 restore_gp_reg(27); restore_gp_reg(28); restore_gp_reg(29);
112#undef restore_gp_reg
113
114 return err;
115}
116
117/*
118 * Determine which stack to use..
119 */
Arnd Bergmannbddc6052009-06-27 15:12:16 +0200120static void __user *get_sigframe(struct k_sigaction *ka,
121 struct pt_regs *regs, size_t frame_size)
Chen Liqin6bc9a392009-06-12 22:01:00 +0800122{
123 unsigned long sp;
124
125 /* Default to using normal stack */
126 sp = regs->regs[0];
127 sp -= 32;
128
129 /* This is the X/Open sanctioned signal stack switching. */
130 if ((ka->sa.sa_flags & SA_ONSTACK) && (!on_sig_stack(sp)))
131 sp = current->sas_ss_sp + current->sas_ss_size;
132
Arnd Bergmanna1f82132009-06-27 15:05:30 +0200133 return (void __user*)((sp - frame_size) & ~7);
Chen Liqin6bc9a392009-06-12 22:01:00 +0800134}
135
Arnd Bergmannbddc6052009-06-27 15:12:16 +0200136asmlinkage long
Arnd Bergmannbddc6052009-06-27 15:12:16 +0200137score_rt_sigreturn(struct pt_regs *regs)
Chen Liqin6bc9a392009-06-12 22:01:00 +0800138{
139 struct rt_sigframe __user *frame;
140 sigset_t set;
Chen Liqin6bc9a392009-06-12 22:01:00 +0800141 int sig;
142
Al Virof2ccfb32012-04-22 03:33:45 -0400143 /* Always make any pending restarted system calls return -EINTR */
144 current_thread_info()->restart_block.fn = do_no_restart_syscall;
145
Chen Liqin6bc9a392009-06-12 22:01:00 +0800146 frame = (struct rt_sigframe __user *) regs->regs[0];
147 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
148 goto badframe;
149 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
150 goto badframe;
151
Matt Fleming4c3181b2012-05-11 10:58:05 +1000152 set_current_blocked(&set);
Chen Liqin6bc9a392009-06-12 22:01:00 +0800153
154 sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
155 if (sig < 0)
156 goto badframe;
157 else if (sig)
158 force_sig(sig, current);
159
Al Virob774cc52012-12-23 03:43:28 -0500160 if (restore_altstack(&frame->rs_uc.uc_stack))
Al Viroafd3f962012-11-20 10:36:17 -0500161 goto badframe;
Al Viroaf445f42012-04-30 23:37:41 -0400162 regs->is_syscall = 0;
Chen Liqin6bc9a392009-06-12 22:01:00 +0800163
164 __asm__ __volatile__(
165 "mv\tr0, %0\n\t"
166 "la\tr8, syscall_exit\n\t"
167 "br\tr8\n\t"
168 : : "r" (regs) : "r8");
169
170badframe:
171 force_sig(SIGSEGV, current);
Arnd Bergmannbddc6052009-06-27 15:12:16 +0200172
173 return 0;
Chen Liqin6bc9a392009-06-12 22:01:00 +0800174}
175
Arnd Bergmannbddc6052009-06-27 15:12:16 +0200176static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
Chen Liqin6bc9a392009-06-12 22:01:00 +0800177 int signr, sigset_t *set, siginfo_t *info)
178{
Arnd Bergmanna1f82132009-06-27 15:05:30 +0200179 struct rt_sigframe __user *frame;
Chen Liqin6bc9a392009-06-12 22:01:00 +0800180 int err = 0;
181
182 frame = get_sigframe(ka, regs, sizeof(*frame));
183 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
184 goto give_sigsegv;
185
186 /*
187 * Set up the return code ...
188 *
189 * li v0, __NR_rt_sigreturn
190 * syscall
191 */
192 err |= __put_user(0x87788000 + __NR_rt_sigreturn*2,
193 frame->rs_code + 0);
194 err |= __put_user(0x80008002, frame->rs_code + 1);
195 flush_cache_sigtramp((unsigned long) frame->rs_code);
196
197 err |= copy_siginfo_to_user(&frame->rs_info, info);
198 err |= __put_user(0, &frame->rs_uc.uc_flags);
Arnd Bergmannc6067472009-06-27 14:46:35 +0200199 err |= __put_user(NULL, &frame->rs_uc.uc_link);
Al Virob774cc52012-12-23 03:43:28 -0500200 err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[0]);
Chen Liqin6bc9a392009-06-12 22:01:00 +0800201 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
202 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
203
204 if (err)
205 goto give_sigsegv;
206
207 regs->regs[0] = (unsigned long) frame;
208 regs->regs[3] = (unsigned long) frame->rs_code;
209 regs->regs[4] = signr;
210 regs->regs[5] = (unsigned long) &frame->rs_info;
211 regs->regs[6] = (unsigned long) &frame->rs_uc;
212 regs->regs[29] = (unsigned long) ka->sa.sa_handler;
213 regs->cp0_epc = (unsigned long) ka->sa.sa_handler;
214
215 return 0;
216
217give_sigsegv:
Al Virocf4a0ce2012-04-21 21:39:54 -0400218 force_sigsegv(signr, current);
Chen Liqin6bc9a392009-06-12 22:01:00 +0800219 return -EFAULT;
220}
221
Al Viroa610d6e2012-05-21 23:42:15 -0400222static void handle_signal(unsigned long sig, siginfo_t *info,
Al Virob7f9a112012-05-02 09:59:21 -0400223 struct k_sigaction *ka, struct pt_regs *regs)
Chen Liqin6bc9a392009-06-12 22:01:00 +0800224{
Chen Liqin6bc9a392009-06-12 22:01:00 +0800225 if (regs->is_syscall) {
226 switch (regs->regs[4]) {
227 case ERESTART_RESTARTBLOCK:
228 case ERESTARTNOHAND:
229 regs->regs[4] = EINTR;
230 break;
231 case ERESTARTSYS:
232 if (!(ka->sa.sa_flags & SA_RESTART)) {
233 regs->regs[4] = EINTR;
234 break;
235 }
236 case ERESTARTNOINTR:
237 regs->regs[4] = regs->orig_r4;
238 regs->regs[7] = regs->orig_r7;
239 regs->cp0_epc -= 8;
240 }
241
242 regs->is_syscall = 0;
243 }
244
245 /*
246 * Set up the stack frame
247 */
Al Viroa610d6e2012-05-21 23:42:15 -0400248 if (setup_rt_frame(ka, regs, sig, sigmask_to_save(), info) < 0)
249 return;
Chen Liqin6bc9a392009-06-12 22:01:00 +0800250
Al Viroefee9842012-04-28 02:04:15 -0400251 signal_delivered(sig, info, ka, regs, 0);
Chen Liqin6bc9a392009-06-12 22:01:00 +0800252}
253
Arnd Bergmannbddc6052009-06-27 15:12:16 +0200254static void do_signal(struct pt_regs *regs)
Chen Liqin6bc9a392009-06-12 22:01:00 +0800255{
256 struct k_sigaction ka;
Chen Liqin6bc9a392009-06-12 22:01:00 +0800257 siginfo_t info;
258 int signr;
259
260 /*
261 * We want the common case to go fast, which is why we may in certain
262 * cases get here from kernel mode. Just return without doing anything
263 * if so.
264 */
265 if (!user_mode(regs))
266 return;
267
Chen Liqin6bc9a392009-06-12 22:01:00 +0800268 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
269 if (signr > 0) {
270 /* Actually deliver the signal. */
Al Viroa610d6e2012-05-21 23:42:15 -0400271 handle_signal(signr, &info, &ka, regs);
Chen Liqin6bc9a392009-06-12 22:01:00 +0800272 return;
273 }
274
275 if (regs->is_syscall) {
276 if (regs->regs[4] == ERESTARTNOHAND ||
277 regs->regs[4] == ERESTARTSYS ||
278 regs->regs[4] == ERESTARTNOINTR) {
279 regs->regs[4] = regs->orig_r4;
280 regs->regs[7] = regs->orig_r7;
281 regs->cp0_epc -= 8;
282 }
283
284 if (regs->regs[4] == ERESTART_RESTARTBLOCK) {
285 regs->regs[27] = __NR_restart_syscall;
286 regs->regs[4] = regs->orig_r4;
287 regs->regs[7] = regs->orig_r7;
288 regs->cp0_epc -= 8;
289 }
290
291 regs->is_syscall = 0; /* Don't deal with this again. */
292 }
293
294 /*
295 * If there's no signal to deliver, we just put the saved sigmask
296 * back
297 */
Al Viro51a7b442012-05-21 23:33:55 -0400298 restore_saved_sigmask();
Chen Liqin6bc9a392009-06-12 22:01:00 +0800299}
300
301/*
302 * notification of userspace execution resumption
303 * - triggered by the TIF_WORK_MASK flags
304 */
305asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
306 __u32 thread_info_flags)
307{
308 /* deal with pending signal delivery */
Al Viro1d5d4db2012-04-24 01:55:30 -0400309 if (thread_info_flags & _TIF_SIGPENDING)
Chen Liqin6bc9a392009-06-12 22:01:00 +0800310 do_signal(regs);
Al Viro1d5d4db2012-04-24 01:55:30 -0400311 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
312 clear_thread_flag(TIF_NOTIFY_RESUME);
313 tracehook_notify_resume(regs);
Al Viro1d5d4db2012-04-24 01:55:30 -0400314 }
Chen Liqin6bc9a392009-06-12 22:01:00 +0800315}