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 <asm/entry.h>
35 #include <asm/ucontext.h>
36 #include <linux/uaccess.h>
37 #include <asm/pgtable.h>
38 #include <asm/pgalloc.h>
39 #include <linux/syscalls.h>
40 #include <asm/cacheflush.h>
41 #include <asm/syscalls.h>
43 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
45 asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_sycall);
49 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
52 return do_sigaltstack(uss, uoss, regs->r1);
56 * Do a signal return; undo the signal stack.
60 unsigned long extramask[_NSIG_WORDS-1];
61 unsigned long tramp[2]; /* signal trampoline */
67 unsigned long tramp[2]; /* signal trampoline */
70 static int restore_sigcontext(struct pt_regs *regs,
71 struct sigcontext __user *sc, int *rval_p)
75 #define COPY(x) {err |= __get_user(regs->x, &sc->regs.x); }
78 COPY(r2); COPY(r3); COPY(r4); COPY(r5);
79 COPY(r6); COPY(r7); COPY(r8); COPY(r9);
80 COPY(r10); COPY(r11); COPY(r12); COPY(r13);
81 COPY(r14); COPY(r15); COPY(r16); COPY(r17);
82 COPY(r18); COPY(r19); COPY(r20); COPY(r21);
83 COPY(r22); COPY(r23); COPY(r24); COPY(r25);
84 COPY(r26); COPY(r27); COPY(r28); COPY(r29);
86 COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
94 asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
96 struct rt_sigframe __user *frame =
97 (struct rt_sigframe __user *)(regs->r1 + STATE_SAVE_ARG_SPACE);
102 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
105 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
108 sigdelsetmask(&set, ~_BLOCKABLE);
109 spin_lock_irq(¤t->sighand->siglock);
110 current->blocked = set;
112 spin_unlock_irq(¤t->sighand->siglock);
114 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
117 /* It is more difficult to avoid calling this function than to
118 call it and ignore errors. */
119 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->r1))
125 force_sig(SIGSEGV, current);
130 * Set up a signal frame.
134 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
139 #define COPY(x) {err |= __put_user(regs->x, &sc->regs.x); }
142 COPY(r2); COPY(r3); COPY(r4); COPY(r5);
143 COPY(r6); COPY(r7); COPY(r8); COPY(r9);
144 COPY(r10); COPY(r11); COPY(r12); COPY(r13);
145 COPY(r14); COPY(r15); COPY(r16); COPY(r17);
146 COPY(r18); COPY(r19); COPY(r20); COPY(r21);
147 COPY(r22); COPY(r23); COPY(r24); COPY(r25);
148 COPY(r26); COPY(r27); COPY(r28); COPY(r29);
149 COPY(r30); COPY(r31);
150 COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
153 err |= __put_user(mask, &sc->oldmask);
159 * Determine which stack to use..
161 static inline void __user *
162 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
164 /* Default to using normal stack */
165 unsigned long sp = regs->r1;
167 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && !on_sig_stack(sp))
168 sp = current->sas_ss_sp + current->sas_ss_size;
170 return (void __user *)((sp - frame_size) & -8UL);
173 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
174 sigset_t *set, struct pt_regs *regs)
176 struct rt_sigframe __user *frame;
179 unsigned long address = 0;
185 frame = get_sigframe(ka, regs, sizeof(*frame));
187 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
190 signal = current_thread_info()->exec_domain
191 && current_thread_info()->exec_domain->signal_invmap
193 ? current_thread_info()->exec_domain->signal_invmap[sig]
197 err |= copy_siginfo_to_user(&frame->info, info);
199 /* Create the ucontext. */
200 err |= __put_user(0, &frame->uc.uc_flags);
201 err |= __put_user(0, &frame->uc.uc_link);
202 err |= __put_user((void *)current->sas_ss_sp,
203 &frame->uc.uc_stack.ss_sp);
204 err |= __put_user(sas_ss_flags(regs->r1),
205 &frame->uc.uc_stack.ss_flags);
206 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
207 err |= setup_sigcontext(&frame->uc.uc_mcontext,
209 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
211 /* Set up to return from userspace. If provided, use a stub
212 already in userspace. */
213 /* minus 8 is offset to cater for "rtsd r15,8" */
214 /* addi r12, r0, __NR_sigreturn */
215 err |= __put_user(0x31800000 | __NR_rt_sigreturn ,
218 err |= __put_user(0xb9cc0008, frame->tramp + 1);
220 /* Return from sighandler will jump to the tramp.
221 Negative 8 offset because return is rtsd r15, 8 */
222 regs->r15 = ((unsigned long)frame->tramp)-8;
224 address = ((unsigned long)frame->tramp);
226 pmdp = pmd_offset(pud_offset(
227 pgd_offset(current->mm, address),
231 ptep = pte_offset_map(pmdp, address);
232 if (pte_present(*ptep)) {
233 address = (unsigned long) page_address(pte_page(*ptep));
234 /* MS: I need add offset in page */
235 address += ((unsigned long)frame->tramp) & ~PAGE_MASK;
236 /* MS address is virtual */
237 address = virt_to_phys(address);
238 invalidate_icache_range(address, address + 8);
239 flush_dcache_range(address, address + 8);
244 flush_icache_range(address, address + 8);
245 flush_dcache_range(address, address + 8);
250 /* Set up registers for signal handler */
251 regs->r1 = (unsigned long) frame - STATE_SAVE_ARG_SPACE;
253 /* Signal handler args: */
254 regs->r5 = signal; /* arg 0: signum */
255 regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */
256 regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */
257 /* Offset to handle microblaze rtid r14, 0 */
258 regs->pc = (unsigned long)ka->sa.sa_handler;
262 /* the tracer may want to single-step inside the handler */
263 if (test_thread_flag(TIF_SINGLESTEP))
264 ptrace_notify(SIGTRAP);
267 printk(KERN_INFO "SIG deliver (%s:%d): sp=%p pc=%08lx\n",
268 current->comm, current->pid, frame, regs->pc);
275 ka->sa.sa_handler = SIG_DFL;
276 force_sig(SIGSEGV, current);
279 /* Handle restarting system calls */
281 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
284 case -ERESTART_RESTARTBLOCK:
285 case -ERESTARTNOHAND:
291 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
296 case -ERESTARTNOINTR:
298 /* offset of 4 bytes to re-execute trap (brki) instruction */
302 /* offset of 8 bytes required = 4 for rtbd
303 offset, plus 4 for size of
313 * OK, we're invoking a handler
317 handle_signal(unsigned long sig, struct k_sigaction *ka,
318 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
320 /* Set up the stack frame */
321 if (ka->sa.sa_flags & SA_SIGINFO)
322 setup_rt_frame(sig, ka, info, oldset, regs);
324 setup_rt_frame(sig, ka, NULL, oldset, regs);
326 if (ka->sa.sa_flags & SA_ONESHOT)
327 ka->sa.sa_handler = SIG_DFL;
329 if (!(ka->sa.sa_flags & SA_NODEFER)) {
330 spin_lock_irq(¤t->sighand->siglock);
331 sigorsets(¤t->blocked,
332 ¤t->blocked, &ka->sa.sa_mask);
333 sigaddset(¤t->blocked, sig);
335 spin_unlock_irq(¤t->sighand->siglock);
341 * Note that 'init' is a special process: it doesn't get signals it doesn't
342 * want to handle. Thus you cannot kill init even with a SIGKILL even by
345 * Note that we go through the signals twice: once to check the signals that
346 * the kernel can handle, and then we build all the user-level signal handling
347 * stack-frames in one go after that.
349 int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_syscall)
353 struct k_sigaction ka;
355 printk(KERN_INFO "do signal: %p %p %d\n", regs, oldset, in_syscall);
356 printk(KERN_INFO "do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
357 regs->r12, current_thread_info()->flags);
360 * We want the common case to go fast, which
361 * is why we may in certain cases get here from
362 * kernel mode. Just return without doing anything
365 if (kernel_mode(regs))
368 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
369 oldset = ¤t->saved_sigmask;
371 oldset = ¤t->blocked;
373 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
375 /* Whee! Actually deliver the signal. */
377 handle_restart(regs, &ka, 1);
378 if (handle_signal(signr, &ka, &info, oldset, regs)) {
380 * A signal was successfully delivered; the saved
381 * sigmask will have been stored in the signal frame,
382 * and will be restored by sigreturn, so we can simply
383 * clear the TS_RESTORE_SIGMASK flag.
385 current_thread_info()->status &=
392 handle_restart(regs, NULL, 0);
395 * If there's no signal to deliver, we just put the saved sigmask
398 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
399 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
400 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
403 /* Did we come from a system call? */