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1/*
2 * OpenRISC signal.c
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * Modifications for the OpenRISC architecture:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18#include <linux/sched.h>
19#include <linux/mm.h>
20#include <linux/smp.h>
21#include <linux/kernel.h>
22#include <linux/signal.h>
23#include <linux/errno.h>
24#include <linux/wait.h>
25#include <linux/ptrace.h>
26#include <linux/unistd.h>
27#include <linux/stddef.h>
28#include <linux/tracehook.h>
29
30#include <asm/processor.h>
31#include <asm/ucontext.h>
32#include <asm/uaccess.h>
33
34#define DEBUG_SIG 0
35
36#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
37
38asmlinkage long
39_sys_sigaltstack(const stack_t *uss, stack_t *uoss, struct pt_regs *regs)
40{
41 return do_sigaltstack(uss, uoss, regs->sp);
42}
43
44struct rt_sigframe {
45 struct siginfo *pinfo;
46 void *puc;
47 struct siginfo info;
48 struct ucontext uc;
49 unsigned char retcode[16]; /* trampoline code */
50};
51
52static int restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
53{
54 unsigned int err = 0;
55
56 /* Alwys make any pending restarted system call return -EINTR */
57 current_thread_info()->restart_block.fn = do_no_restart_syscall;
58
59 /*
60 * Restore the regs from &sc->regs.
61 * (sc is already checked for VERIFY_READ since the sigframe was
62 * checked in sys_sigreturn previously)
63 */
64 if (__copy_from_user(regs, sc->regs.gpr, 32 * sizeof(unsigned long)))
65 goto badframe;
66 if (__copy_from_user(®s->pc, &sc->regs.pc, sizeof(unsigned long)))
67 goto badframe;
68 if (__copy_from_user(®s->sr, &sc->regs.sr, sizeof(unsigned long)))
69 goto badframe;
70
71 /* make sure the SM-bit is cleared so user-mode cannot fool us */
72 regs->sr &= ~SPR_SR_SM;
73
74 /* TODO: the other ports use regs->orig_XX to disable syscall checks
75 * after this completes, but we don't use that mechanism. maybe we can
76 * use it now ?
77 */
78
79 return err;
80
81badframe:
82 return 1;
83}
84
85asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs)
86{
87 struct rt_sigframe *frame = (struct rt_sigframe __user *)regs->sp;
88 sigset_t set;
89 stack_t st;
90
91 /*
92 * Since we stacked the signal on a dword boundary,
93 * then frame should be dword aligned here. If it's
94 * not, then the user is trying to mess with us.
95 */
96 if (((long)frame) & 3)
97 goto badframe;
98
99 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
100 goto badframe;
101 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
102 goto badframe;
103
104 sigdelsetmask(&set, ~_BLOCKABLE);
105 spin_lock_irq(¤t->sighand->siglock);
106 current->blocked = set;
107 recalc_sigpending();
108 spin_unlock_irq(¤t->sighand->siglock);
109
110 if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
111 goto badframe;
112
113 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
114 goto badframe;
115 /* It is more difficult to avoid calling this function than to
116 call it and ignore errors. */
117 do_sigaltstack(&st, NULL, regs->sp);
118
119 return regs->gpr[11];
120
121badframe:
122 force_sig(SIGSEGV, current);
123 return 0;
124}
125
126/*
127 * Set up a signal frame.
128 */
129
130static int setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
131 unsigned long mask)
132{
133 int err = 0;
134
135 /* copy the regs */
136
137 err |= __copy_to_user(sc->regs.gpr, regs, 32 * sizeof(unsigned long));
138 err |= __copy_to_user(&sc->regs.pc, ®s->pc, sizeof(unsigned long));
139 err |= __copy_to_user(&sc->regs.sr, ®s->sr, sizeof(unsigned long));
140
141 /* then some other stuff */
142
143 err |= __put_user(mask, &sc->oldmask);
144
145 return err;
146}
147
148static inline unsigned long align_sigframe(unsigned long sp)
149{
150 return sp & ~3UL;
151}
152
153/*
154 * Work out where the signal frame should go. It's either on the user stack
155 * or the alternate stack.
156 */
157
158static inline void __user *get_sigframe(struct k_sigaction *ka,
159 struct pt_regs *regs, size_t frame_size)
160{
161 unsigned long sp = regs->sp;
162 int onsigstack = on_sig_stack(sp);
163
164 /* redzone */
165 sp -= STACK_FRAME_OVERHEAD;
166
167 /* This is the X/Open sanctioned signal stack switching. */
168 if ((ka->sa.sa_flags & SA_ONSTACK) && !onsigstack) {
169 if (current->sas_ss_size)
170 sp = current->sas_ss_sp + current->sas_ss_size;
171 }
172
173 sp = align_sigframe(sp - frame_size);
174
175 /*
176 * If we are on the alternate signal stack and would overflow it, don't.
177 * Return an always-bogus address instead so we will die with SIGSEGV.
178 */
179 if (onsigstack && !likely(on_sig_stack(sp)))
180 return (void __user *)-1L;
181
182 return (void __user *)sp;
183}
184
185/* grab and setup a signal frame.
186 *
187 * basically we stack a lot of state info, and arrange for the
188 * user-mode program to return to the kernel using either a
189 * trampoline which performs the syscall sigreturn, or a provided
190 * user-mode trampoline.
191 */
192static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
193 sigset_t *set, struct pt_regs *regs)
194{
195 struct rt_sigframe *frame;
196 unsigned long return_ip;
197 int err = 0;
198
199 frame = get_sigframe(ka, regs, sizeof(*frame));
200
201 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
202 goto give_sigsegv;
203
204 err |= __put_user(&frame->info, &frame->pinfo);
205 err |= __put_user(&frame->uc, &frame->puc);
206
207 if (ka->sa.sa_flags & SA_SIGINFO)
208 err |= copy_siginfo_to_user(&frame->info, info);
209 if (err)
210 goto give_sigsegv;
211
212 /* Clear all the bits of the ucontext we don't use. */
213 err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
214 err |= __put_user(0, &frame->uc.uc_flags);
215 err |= __put_user(NULL, &frame->uc.uc_link);
216 err |= __put_user((void *)current->sas_ss_sp,
217 &frame->uc.uc_stack.ss_sp);
218 err |= __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags);
219 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
220 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
221
222 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
223
224 if (err)
225 goto give_sigsegv;
226
227 /* trampoline - the desired return ip is the retcode itself */
228 return_ip = (unsigned long)&frame->retcode;
229 /* This is l.ori r11,r0,__NR_sigreturn, l.sys 1 */
230 err |= __put_user(0xa960, (short *)(frame->retcode + 0));
231 err |= __put_user(__NR_rt_sigreturn, (short *)(frame->retcode + 2));
232 err |= __put_user(0x20000001, (unsigned long *)(frame->retcode + 4));
233 err |= __put_user(0x15000000, (unsigned long *)(frame->retcode + 8));
234
235 if (err)
236 goto give_sigsegv;
237
238 /* TODO what is the current->exec_domain stuff and invmap ? */
239
240 /* Set up registers for signal handler */
241 regs->pc = (unsigned long)ka->sa.sa_handler; /* what we enter NOW */
242 regs->gpr[9] = (unsigned long)return_ip; /* what we enter LATER */
243 regs->gpr[3] = (unsigned long)sig; /* arg 1: signo */
244 regs->gpr[4] = (unsigned long)&frame->info; /* arg 2: (siginfo_t*) */
245 regs->gpr[5] = (unsigned long)&frame->uc; /* arg 3: ucontext */
246
247 /* actually move the usp to reflect the stacked frame */
248 regs->sp = (unsigned long)frame;
249
250 return;
251
252give_sigsegv:
253 if (sig == SIGSEGV)
254 ka->sa.sa_handler = SIG_DFL;
255 force_sig(SIGSEGV, current);
256}
257
258static inline void
259handle_signal(unsigned long sig,
260 siginfo_t *info, struct k_sigaction *ka,
261 sigset_t *oldset, struct pt_regs *regs)
262{
263 setup_rt_frame(sig, ka, info, oldset, regs);
264
265 if (ka->sa.sa_flags & SA_ONESHOT)
266 ka->sa.sa_handler = SIG_DFL;
267
268 spin_lock_irq(¤t->sighand->siglock);
269 sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
270 if (!(ka->sa.sa_flags & SA_NODEFER))
271 sigaddset(¤t->blocked, sig);
272 recalc_sigpending();
273
274 spin_unlock_irq(¤t->sighand->siglock);
275}
276
277/*
278 * Note that 'init' is a special process: it doesn't get signals it doesn't
279 * want to handle. Thus you cannot kill init even with a SIGKILL even by
280 * mistake.
281 *
282 * Also note that the regs structure given here as an argument, is the latest
283 * pushed pt_regs. It may or may not be the same as the first pushed registers
284 * when the initial usermode->kernelmode transition took place. Therefore
285 * we can use user_mode(regs) to see if we came directly from kernel or user
286 * mode below.
287 */
288
289void do_signal(struct pt_regs *regs)
290{
291 siginfo_t info;
292 int signr;
293 struct k_sigaction ka;
294
295 /*
296 * We want the common case to go fast, which
297 * is why we may in certain cases get here from
298 * kernel mode. Just return without doing anything
299 * if so.
300 */
301 if (!user_mode(regs))
302 return;
303
304 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
305
306 /* If we are coming out of a syscall then we need
307 * to check if the syscall was interrupted and wants to be
308 * restarted after handling the signal. If so, the original
309 * syscall number is put back into r11 and the PC rewound to
310 * point at the l.sys instruction that resulted in the
311 * original syscall. Syscall results other than the four
312 * below mean that the syscall executed to completion and no
313 * restart is necessary.
314 */
315 if (regs->syscallno) {
316 int restart = 0;
317
318 switch (regs->gpr[11]) {
319 case -ERESTART_RESTARTBLOCK:
320 case -ERESTARTNOHAND:
321 /* Restart if there is no signal handler */
322 restart = (signr <= 0);
323 break;
324 case -ERESTARTSYS:
325 /* Restart if there no signal handler or
326 * SA_RESTART flag is set */
327 restart = (signr <= 0 || (ka.sa.sa_flags & SA_RESTART));
328 break;
329 case -ERESTARTNOINTR:
330 /* Always restart */
331 restart = 1;
332 break;
333 }
334
335 if (restart) {
336 if (regs->gpr[11] == -ERESTART_RESTARTBLOCK)
337 regs->gpr[11] = __NR_restart_syscall;
338 else
339 regs->gpr[11] = regs->orig_gpr11;
340 regs->pc -= 4;
341 } else {
342 regs->gpr[11] = -EINTR;
343 }
344 }
345
346 if (signr <= 0) {
347 /* no signal to deliver so we just put the saved sigmask
348 * back */
349 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
350 clear_thread_flag(TIF_RESTORE_SIGMASK);
351 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
352 }
353
354 } else { /* signr > 0 */
355 sigset_t *oldset;
356
357 if (current_thread_info()->flags & _TIF_RESTORE_SIGMASK)
358 oldset = ¤t->saved_sigmask;
359 else
360 oldset = ¤t->blocked;
361
362 /* Whee! Actually deliver the signal. */
363 handle_signal(signr, &info, &ka, oldset, regs);
364 /* a signal was successfully delivered; the saved
365 * sigmask will have been stored in the signal frame,
366 * and will be restored by sigreturn, so we can simply
367 * clear the TIF_RESTORE_SIGMASK flag */
368 if (test_thread_flag(TIF_RESTORE_SIGMASK))
369 clear_thread_flag(TIF_RESTORE_SIGMASK);
370
371 tracehook_signal_handler(signr, &info, &ka, regs,
372 test_thread_flag(TIF_SINGLESTEP));
373 }
374
375 return;
376}
377
378asmlinkage void do_notify_resume(struct pt_regs *regs)
379{
380 if (current_thread_info()->flags & _TIF_SIGPENDING)
381 do_signal(regs);
382
383 if (current_thread_info()->flags & _TIF_NOTIFY_RESUME) {
384 clear_thread_flag(TIF_NOTIFY_RESUME);
385 tracehook_notify_resume(regs);
386 if (current->replacement_session_keyring)
387 key_replace_session_keyring();
388 }
389}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OpenRISC signal.c
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
7 * declaration.
8 *
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 */
13
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/kernel.h>
18#include <linux/signal.h>
19#include <linux/errno.h>
20#include <linux/wait.h>
21#include <linux/ptrace.h>
22#include <linux/unistd.h>
23#include <linux/stddef.h>
24#include <linux/tracehook.h>
25
26#include <asm/processor.h>
27#include <asm/syscall.h>
28#include <asm/ucontext.h>
29#include <linux/uaccess.h>
30
31#define DEBUG_SIG 0
32
33struct rt_sigframe {
34 struct siginfo info;
35 struct ucontext uc;
36 unsigned char retcode[16]; /* trampoline code */
37};
38
39static int restore_sigcontext(struct pt_regs *regs,
40 struct sigcontext __user *sc)
41{
42 int err = 0;
43
44 /* Always make any pending restarted system calls return -EINTR */
45 current->restart_block.fn = do_no_restart_syscall;
46
47 /*
48 * Restore the regs from &sc->regs.
49 * (sc is already checked since the sigframe was
50 * checked in sys_sigreturn previously)
51 */
52 err |= __copy_from_user(regs, sc->regs.gpr, 32 * sizeof(unsigned long));
53 err |= __copy_from_user(®s->pc, &sc->regs.pc, sizeof(unsigned long));
54 err |= __copy_from_user(®s->sr, &sc->regs.sr, sizeof(unsigned long));
55
56 /* make sure the SM-bit is cleared so user-mode cannot fool us */
57 regs->sr &= ~SPR_SR_SM;
58
59 regs->orig_gpr11 = -1; /* Avoid syscall restart checks */
60
61 /* TODO: the other ports use regs->orig_XX to disable syscall checks
62 * after this completes, but we don't use that mechanism. maybe we can
63 * use it now ?
64 */
65
66 return err;
67}
68
69asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs)
70{
71 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->sp;
72 sigset_t set;
73
74 /*
75 * Since we stacked the signal on a dword boundary,
76 * then frame should be dword aligned here. If it's
77 * not, then the user is trying to mess with us.
78 */
79 if (((unsigned long)frame) & 3)
80 goto badframe;
81
82 if (!access_ok(frame, sizeof(*frame)))
83 goto badframe;
84 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
85 goto badframe;
86
87 set_current_blocked(&set);
88
89 if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
90 goto badframe;
91
92 if (restore_altstack(&frame->uc.uc_stack))
93 goto badframe;
94
95 return regs->gpr[11];
96
97badframe:
98 force_sig(SIGSEGV);
99 return 0;
100}
101
102/*
103 * Set up a signal frame.
104 */
105
106static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
107{
108 int err = 0;
109
110 /* copy the regs */
111 /* There should be no need to save callee-saved registers here...
112 * ...but we save them anyway. Revisit this
113 */
114 err |= __copy_to_user(sc->regs.gpr, regs, 32 * sizeof(unsigned long));
115 err |= __copy_to_user(&sc->regs.pc, ®s->pc, sizeof(unsigned long));
116 err |= __copy_to_user(&sc->regs.sr, ®s->sr, sizeof(unsigned long));
117
118 return err;
119}
120
121static inline unsigned long align_sigframe(unsigned long sp)
122{
123 return sp & ~3UL;
124}
125
126/*
127 * Work out where the signal frame should go. It's either on the user stack
128 * or the alternate stack.
129 */
130
131static inline void __user *get_sigframe(struct ksignal *ksig,
132 struct pt_regs *regs, size_t frame_size)
133{
134 unsigned long sp = regs->sp;
135
136 /* redzone */
137 sp -= STACK_FRAME_OVERHEAD;
138 sp = sigsp(sp, ksig);
139 sp = align_sigframe(sp - frame_size);
140
141 return (void __user *)sp;
142}
143
144/* grab and setup a signal frame.
145 *
146 * basically we stack a lot of state info, and arrange for the
147 * user-mode program to return to the kernel using either a
148 * trampoline which performs the syscall sigreturn, or a provided
149 * user-mode trampoline.
150 */
151static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
152 struct pt_regs *regs)
153{
154 struct rt_sigframe __user *frame;
155 unsigned long return_ip;
156 int err = 0;
157
158 frame = get_sigframe(ksig, regs, sizeof(*frame));
159
160 if (!access_ok(frame, sizeof(*frame)))
161 return -EFAULT;
162
163 /* Create siginfo. */
164 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
165 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
166
167 /* Create the ucontext. */
168 err |= __put_user(0, &frame->uc.uc_flags);
169 err |= __put_user(NULL, &frame->uc.uc_link);
170 err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
171 err |= setup_sigcontext(regs, &frame->uc.uc_mcontext);
172
173 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
174
175 if (err)
176 return -EFAULT;
177
178 /* trampoline - the desired return ip is the retcode itself */
179 return_ip = (unsigned long)&frame->retcode;
180 /* This is:
181 l.ori r11,r0,__NR_sigreturn
182 l.sys 1
183 */
184 err |= __put_user(0xa960, (short __user *)(frame->retcode + 0));
185 err |= __put_user(__NR_rt_sigreturn, (short __user *)(frame->retcode + 2));
186 err |= __put_user(0x20000001, (unsigned long __user *)(frame->retcode + 4));
187 err |= __put_user(0x15000000, (unsigned long __user *)(frame->retcode + 8));
188
189 if (err)
190 return -EFAULT;
191
192 /* Set up registers for signal handler */
193 regs->pc = (unsigned long)ksig->ka.sa.sa_handler; /* what we enter NOW */
194 regs->gpr[9] = (unsigned long)return_ip; /* what we enter LATER */
195 regs->gpr[3] = (unsigned long)ksig->sig; /* arg 1: signo */
196 regs->gpr[4] = (unsigned long)&frame->info; /* arg 2: (siginfo_t*) */
197 regs->gpr[5] = (unsigned long)&frame->uc; /* arg 3: ucontext */
198
199 /* actually move the usp to reflect the stacked frame */
200 regs->sp = (unsigned long)frame;
201
202 return 0;
203}
204
205static inline void
206handle_signal(struct ksignal *ksig, struct pt_regs *regs)
207{
208 int ret;
209
210 ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
211
212 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
213}
214
215/*
216 * Note that 'init' is a special process: it doesn't get signals it doesn't
217 * want to handle. Thus you cannot kill init even with a SIGKILL even by
218 * mistake.
219 *
220 * Also note that the regs structure given here as an argument, is the latest
221 * pushed pt_regs. It may or may not be the same as the first pushed registers
222 * when the initial usermode->kernelmode transition took place. Therefore
223 * we can use user_mode(regs) to see if we came directly from kernel or user
224 * mode below.
225 */
226
227int do_signal(struct pt_regs *regs, int syscall)
228{
229 struct ksignal ksig;
230 unsigned long continue_addr = 0;
231 unsigned long restart_addr = 0;
232 unsigned long retval = 0;
233 int restart = 0;
234
235 if (syscall) {
236 continue_addr = regs->pc;
237 restart_addr = continue_addr - 4;
238 retval = regs->gpr[11];
239
240 /*
241 * Setup syscall restart here so that a debugger will
242 * see the already changed PC.
243 */
244 switch (retval) {
245 case -ERESTART_RESTARTBLOCK:
246 restart = -2;
247 fallthrough;
248 case -ERESTARTNOHAND:
249 case -ERESTARTSYS:
250 case -ERESTARTNOINTR:
251 restart++;
252 regs->gpr[11] = regs->orig_gpr11;
253 regs->pc = restart_addr;
254 break;
255 }
256 }
257
258 /*
259 * Get the signal to deliver. During the call to get_signal the
260 * debugger may change all our registers so we may need to revert
261 * the decision to restart the syscall; specifically, if the PC is
262 * changed, don't restart the syscall.
263 */
264 if (get_signal(&ksig)) {
265 if (unlikely(restart) && regs->pc == restart_addr) {
266 if (retval == -ERESTARTNOHAND ||
267 retval == -ERESTART_RESTARTBLOCK
268 || (retval == -ERESTARTSYS
269 && !(ksig.ka.sa.sa_flags & SA_RESTART))) {
270 /* No automatic restart */
271 regs->gpr[11] = -EINTR;
272 regs->pc = continue_addr;
273 }
274 }
275 handle_signal(&ksig, regs);
276 } else {
277 /* no handler */
278 restore_saved_sigmask();
279 /*
280 * Restore pt_regs PC as syscall restart will be handled by
281 * kernel without return to userspace
282 */
283 if (unlikely(restart) && regs->pc == restart_addr) {
284 regs->pc = continue_addr;
285 return restart;
286 }
287 }
288
289 return 0;
290}
291
292asmlinkage int
293do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
294{
295 do {
296 if (likely(thread_flags & _TIF_NEED_RESCHED)) {
297 schedule();
298 } else {
299 if (unlikely(!user_mode(regs)))
300 return 0;
301 local_irq_enable();
302 if (thread_flags & _TIF_SIGPENDING) {
303 int restart = do_signal(regs, syscall);
304 if (unlikely(restart)) {
305 /*
306 * Restart without handlers.
307 * Deal with it without leaving
308 * the kernel space.
309 */
310 return restart;
311 }
312 syscall = 0;
313 } else {
314 clear_thread_flag(TIF_NOTIFY_RESUME);
315 tracehook_notify_resume(regs);
316 }
317 }
318 local_irq_disable();
319 thread_flags = current_thread_info()->flags;
320 } while (thread_flags & _TIF_WORK_MASK);
321 return 0;
322}