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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/microblaze/kernel/signal.c
4 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
5 * Copyright (C) 2008-2009 PetaLogix
6 * Copyright (C) 2003,2004 John Williams <jwilliams@itee.uq.edu.au>
7 * Copyright (C) 2001 NEC Corporation
8 * Copyright (C) 2001 Miles Bader <miles@gnu.org>
9 * Copyright (C) 1999,2000 Niibe Yutaka & Kaz Kojima
10 * Copyright (C) 1991,1992 Linus Torvalds
12 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
14 * This file was was derived from the sh version, arch/sh/kernel/signal.c
16 * This file is subject to the terms and conditions of the GNU General
17 * Public License. See the file COPYING in the main directory of this
18 * archive for more details.
21 #include <linux/sched.h>
23 #include <linux/smp.h>
24 #include <linux/kernel.h>
25 #include <linux/signal.h>
26 #include <linux/errno.h>
27 #include <linux/wait.h>
28 #include <linux/ptrace.h>
29 #include <linux/unistd.h>
30 #include <linux/stddef.h>
31 #include <linux/personality.h>
32 #include <linux/percpu.h>
33 #include <linux/linkage.h>
34 #include <linux/tracehook.h>
35 #include <asm/entry.h>
36 #include <asm/ucontext.h>
37 #include <linux/uaccess.h>
38 #include <asm/pgtable.h>
39 #include <asm/pgalloc.h>
40 #include <linux/syscalls.h>
41 #include <asm/cacheflush.h>
42 #include <asm/syscalls.h>
44 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
47 sys_sigaltstack(const stack_t __user
*uss
, stack_t __user
*uoss
,
50 return do_sigaltstack(uss
, uoss
, regs
->r1
);
54 * Do a signal return; undo the signal stack.
58 unsigned long extramask
[_NSIG_WORDS
-1];
59 unsigned long tramp
[2]; /* signal trampoline */
65 unsigned long tramp
[2]; /* signal trampoline */
68 static int restore_sigcontext(struct pt_regs
*regs
,
69 struct sigcontext __user
*sc
, int *rval_p
)
73 #define COPY(x) {err |= __get_user(regs->x, &sc->regs.x); }
76 COPY(r2
); COPY(r3
); COPY(r4
); COPY(r5
);
77 COPY(r6
); COPY(r7
); COPY(r8
); COPY(r9
);
78 COPY(r10
); COPY(r11
); COPY(r12
); COPY(r13
);
79 COPY(r14
); COPY(r15
); COPY(r16
); COPY(r17
);
80 COPY(r18
); COPY(r19
); COPY(r20
); COPY(r21
);
81 COPY(r22
); COPY(r23
); COPY(r24
); COPY(r25
);
82 COPY(r26
); COPY(r27
); COPY(r28
); COPY(r29
);
84 COPY(pc
); COPY(ear
); COPY(esr
); COPY(fsr
);
92 asmlinkage
long sys_rt_sigreturn(struct pt_regs
*regs
)
94 struct rt_sigframe __user
*frame
=
95 (struct rt_sigframe __user
*)(regs
->r1
);
100 /* Always make any pending restarted system calls return -EINTR */
101 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
103 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
106 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
109 sigdelsetmask(&set
, ~_BLOCKABLE
);
110 set_current_blocked(&set
);
112 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
, &rval
))
115 /* It is more difficult to avoid calling this function than to
116 call it and ignore errors. */
117 if (do_sigaltstack(&frame
->uc
.uc_stack
, NULL
, regs
->r1
))
123 force_sig(SIGSEGV
, current
);
128 * Set up a signal frame.
132 setup_sigcontext(struct sigcontext __user
*sc
, struct pt_regs
*regs
,
137 #define COPY(x) {err |= __put_user(regs->x, &sc->regs.x); }
140 COPY(r2
); COPY(r3
); COPY(r4
); COPY(r5
);
141 COPY(r6
); COPY(r7
); COPY(r8
); COPY(r9
);
142 COPY(r10
); COPY(r11
); COPY(r12
); COPY(r13
);
143 COPY(r14
); COPY(r15
); COPY(r16
); COPY(r17
);
144 COPY(r18
); COPY(r19
); COPY(r20
); COPY(r21
);
145 COPY(r22
); COPY(r23
); COPY(r24
); COPY(r25
);
146 COPY(r26
); COPY(r27
); COPY(r28
); COPY(r29
);
147 COPY(r30
); COPY(r31
);
148 COPY(pc
); COPY(ear
); COPY(esr
); COPY(fsr
);
151 err
|= __put_user(mask
, &sc
->oldmask
);
157 * Determine which stack to use..
159 static inline void __user
*
160 get_sigframe(struct k_sigaction
*ka
, struct pt_regs
*regs
, size_t frame_size
)
162 /* Default to using normal stack */
163 unsigned long sp
= regs
->r1
;
165 if ((ka
->sa
.sa_flags
& SA_ONSTACK
) != 0 && !on_sig_stack(sp
))
166 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
168 return (void __user
*)((sp
- frame_size
) & -8UL);
171 static int setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
172 sigset_t
*set
, struct pt_regs
*regs
)
174 struct rt_sigframe __user
*frame
;
177 unsigned long address
= 0;
183 frame
= get_sigframe(ka
, regs
, sizeof(*frame
));
185 if (!access_ok(VERIFY_WRITE
, frame
, sizeof(*frame
)))
188 signal
= current_thread_info()->exec_domain
189 && current_thread_info()->exec_domain
->signal_invmap
191 ? current_thread_info()->exec_domain
->signal_invmap
[sig
]
195 err
|= copy_siginfo_to_user(&frame
->info
, info
);
197 /* Create the ucontext. */
198 err
|= __put_user(0, &frame
->uc
.uc_flags
);
199 err
|= __put_user(NULL
, &frame
->uc
.uc_link
);
200 err
|= __put_user((void __user
*)current
->sas_ss_sp
,
201 &frame
->uc
.uc_stack
.ss_sp
);
202 err
|= __put_user(sas_ss_flags(regs
->r1
),
203 &frame
->uc
.uc_stack
.ss_flags
);
204 err
|= __put_user(current
->sas_ss_size
, &frame
->uc
.uc_stack
.ss_size
);
205 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
,
207 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
209 /* Set up to return from userspace. If provided, use a stub
210 already in userspace. */
211 /* minus 8 is offset to cater for "rtsd r15,8" */
212 /* addi r12, r0, __NR_sigreturn */
213 err
|= __put_user(0x31800000 | __NR_rt_sigreturn
,
216 err
|= __put_user(0xb9cc0008, frame
->tramp
+ 1);
218 /* Return from sighandler will jump to the tramp.
219 Negative 8 offset because return is rtsd r15, 8 */
220 regs
->r15
= ((unsigned long)frame
->tramp
)-8;
222 address
= ((unsigned long)frame
->tramp
);
224 pmdp
= pmd_offset(pud_offset(
225 pgd_offset(current
->mm
, address
),
229 ptep
= pte_offset_map(pmdp
, address
);
230 if (pte_present(*ptep
)) {
231 address
= (unsigned long) page_address(pte_page(*ptep
));
232 /* MS: I need add offset in page */
233 address
+= ((unsigned long)frame
->tramp
) & ~PAGE_MASK
;
234 /* MS address is virtual */
235 address
= virt_to_phys(address
);
236 invalidate_icache_range(address
, address
+ 8);
237 flush_dcache_range(address
, address
+ 8);
242 flush_icache_range(address
, address
+ 8);
243 flush_dcache_range(address
, address
+ 8);
248 /* Set up registers for signal handler */
249 regs
->r1
= (unsigned long) frame
;
251 /* Signal handler args: */
252 regs
->r5
= signal
; /* arg 0: signum */
253 regs
->r6
= (unsigned long) &frame
->info
; /* arg 1: siginfo */
254 regs
->r7
= (unsigned long) &frame
->uc
; /* arg2: ucontext */
255 /* Offset to handle microblaze rtid r14, 0 */
256 regs
->pc
= (unsigned long)ka
->sa
.sa_handler
;
260 /* the tracer may want to single-step inside the handler */
261 if (test_thread_flag(TIF_SINGLESTEP
))
262 ptrace_notify(SIGTRAP
);
265 printk(KERN_INFO
"SIG deliver (%s:%d): sp=%p pc=%08lx\n",
266 current
->comm
, current
->pid
, frame
, regs
->pc
);
272 force_sigsegv(sig
, current
);
276 /* Handle restarting system calls */
278 handle_restart(struct pt_regs
*regs
, struct k_sigaction
*ka
, int has_handler
)
281 case -ERESTART_RESTARTBLOCK
:
282 case -ERESTARTNOHAND
:
288 if (has_handler
&& !(ka
->sa
.sa_flags
& SA_RESTART
)) {
293 case -ERESTARTNOINTR
:
295 /* offset of 4 bytes to re-execute trap (brki) instruction */
299 /* offset of 8 bytes required = 4 for rtbd
300 offset, plus 4 for size of
310 * OK, we're invoking a handler
314 handle_signal(unsigned long sig
, struct k_sigaction
*ka
,
315 siginfo_t
*info
, sigset_t
*oldset
, struct pt_regs
*regs
)
319 /* Set up the stack frame */
320 if (ka
->sa
.sa_flags
& SA_SIGINFO
)
321 ret
= setup_rt_frame(sig
, ka
, info
, oldset
, regs
);
323 ret
= setup_rt_frame(sig
, ka
, NULL
, oldset
, regs
);
328 block_sigmask(ka
, sig
);
334 * Note that 'init' is a special process: it doesn't get signals it doesn't
335 * want to handle. Thus you cannot kill init even with a SIGKILL even by
338 * Note that we go through the signals twice: once to check the signals that
339 * the kernel can handle, and then we build all the user-level signal handling
340 * stack-frames in one go after that.
342 static void do_signal(struct pt_regs
*regs
, int in_syscall
)
346 struct k_sigaction ka
;
349 printk(KERN_INFO
"do signal: %p %d\n", regs
, in_syscall
);
350 printk(KERN_INFO
"do signal2: %lx %lx %ld [%lx]\n", regs
->pc
, regs
->r1
,
351 regs
->r12
, current_thread_info()->flags
);
354 if (current_thread_info()->status
& TS_RESTORE_SIGMASK
)
355 oldset
= ¤t
->saved_sigmask
;
357 oldset
= ¤t
->blocked
;
359 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
361 /* Whee! Actually deliver the signal. */
363 handle_restart(regs
, &ka
, 1);
364 if (!handle_signal(signr
, &ka
, &info
, oldset
, regs
)) {
366 * A signal was successfully delivered; the saved
367 * sigmask will have been stored in the signal frame,
368 * and will be restored by sigreturn, so we can simply
369 * clear the TS_RESTORE_SIGMASK flag.
371 current_thread_info()->status
&=
378 handle_restart(regs
, NULL
, 0);
381 * If there's no signal to deliver, we just put the saved sigmask
384 restore_saved_sigmask();
387 void do_notify_resume(struct pt_regs
*regs
, int in_syscall
)
390 * We want the common case to go fast, which
391 * is why we may in certain cases get here from
392 * kernel mode. Just return without doing anything
395 if (kernel_mode(regs
))
398 if (test_thread_flag(TIF_SIGPENDING
))
399 do_signal(regs
, in_syscall
);
401 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME
))
402 tracehook_notify_resume(regs
);