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 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
385 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
386 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
390 void do_notify_resume(struct pt_regs *regs, int in_syscall)
393 * We want the common case to go fast, which
394 * is why we may in certain cases get here from
395 * kernel mode. Just return without doing anything
398 if (kernel_mode(regs))
401 if (test_thread_flag(TIF_SIGPENDING))
402 do_signal(regs, in_syscall);
404 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
405 tracehook_notify_resume(regs);
406 if (current->replacement_session_keyring)
407 key_replace_session_keyring();