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>
45 * Do a signal return; undo the signal stack.
49 unsigned long extramask[_NSIG_WORDS-1];
50 unsigned long tramp[2]; /* signal trampoline */
56 unsigned long tramp[2]; /* signal trampoline */
59 static int restore_sigcontext(struct pt_regs *regs,
60 struct sigcontext __user *sc, int *rval_p)
64 #define COPY(x) {err |= __get_user(regs->x, &sc->regs.x); }
67 COPY(r2); COPY(r3); COPY(r4); COPY(r5);
68 COPY(r6); COPY(r7); COPY(r8); COPY(r9);
69 COPY(r10); COPY(r11); COPY(r12); COPY(r13);
70 COPY(r14); COPY(r15); COPY(r16); COPY(r17);
71 COPY(r18); COPY(r19); COPY(r20); COPY(r21);
72 COPY(r22); COPY(r23); COPY(r24); COPY(r25);
73 COPY(r26); COPY(r27); COPY(r28); COPY(r29);
75 COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
83 asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
85 struct rt_sigframe __user *frame =
86 (struct rt_sigframe __user *)(regs->r1);
91 /* Always make any pending restarted system calls return -EINTR */
92 current_thread_info()->restart_block.fn = do_no_restart_syscall;
94 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
97 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
100 set_current_blocked(&set);
102 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
105 if (restore_altstack(&frame->uc.uc_stack))
111 force_sig(SIGSEGV, current);
116 * Set up a signal frame.
120 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
125 #define COPY(x) {err |= __put_user(regs->x, &sc->regs.x); }
128 COPY(r2); COPY(r3); COPY(r4); COPY(r5);
129 COPY(r6); COPY(r7); COPY(r8); COPY(r9);
130 COPY(r10); COPY(r11); COPY(r12); COPY(r13);
131 COPY(r14); COPY(r15); COPY(r16); COPY(r17);
132 COPY(r18); COPY(r19); COPY(r20); COPY(r21);
133 COPY(r22); COPY(r23); COPY(r24); COPY(r25);
134 COPY(r26); COPY(r27); COPY(r28); COPY(r29);
135 COPY(r30); COPY(r31);
136 COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
139 err |= __put_user(mask, &sc->oldmask);
145 * Determine which stack to use..
147 static inline void __user *
148 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
150 /* Default to using normal stack */
151 unsigned long sp = regs->r1;
153 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && !on_sig_stack(sp))
154 sp = current->sas_ss_sp + current->sas_ss_size;
156 return (void __user *)((sp - frame_size) & -8UL);
159 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
160 sigset_t *set, struct pt_regs *regs)
162 struct rt_sigframe __user *frame;
165 unsigned long address = 0;
171 frame = get_sigframe(ka, regs, sizeof(*frame));
173 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
176 signal = current_thread_info()->exec_domain
177 && current_thread_info()->exec_domain->signal_invmap
179 ? current_thread_info()->exec_domain->signal_invmap[sig]
183 err |= copy_siginfo_to_user(&frame->info, info);
185 /* Create the ucontext. */
186 err |= __put_user(0, &frame->uc.uc_flags);
187 err |= __put_user(NULL, &frame->uc.uc_link);
188 err |= __save_altstack(&frame->uc.uc_stack, regs->r1);
189 err |= setup_sigcontext(&frame->uc.uc_mcontext,
191 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
193 /* Set up to return from userspace. If provided, use a stub
194 already in userspace. */
195 /* minus 8 is offset to cater for "rtsd r15,8" */
196 /* addi r12, r0, __NR_sigreturn */
197 err |= __put_user(0x31800000 | __NR_rt_sigreturn ,
200 err |= __put_user(0xb9cc0008, frame->tramp + 1);
202 /* Return from sighandler will jump to the tramp.
203 Negative 8 offset because return is rtsd r15, 8 */
204 regs->r15 = ((unsigned long)frame->tramp)-8;
206 address = ((unsigned long)frame->tramp);
208 pmdp = pmd_offset(pud_offset(
209 pgd_offset(current->mm, address),
213 ptep = pte_offset_map(pmdp, address);
214 if (pte_present(*ptep)) {
215 address = (unsigned long) page_address(pte_page(*ptep));
216 /* MS: I need add offset in page */
217 address += ((unsigned long)frame->tramp) & ~PAGE_MASK;
218 /* MS address is virtual */
219 address = __virt_to_phys(address);
220 invalidate_icache_range(address, address + 8);
221 flush_dcache_range(address, address + 8);
226 flush_icache_range(address, address + 8);
227 flush_dcache_range(address, address + 8);
232 /* Set up registers for signal handler */
233 regs->r1 = (unsigned long) frame;
235 /* Signal handler args: */
236 regs->r5 = signal; /* arg 0: signum */
237 regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */
238 regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */
239 /* Offset to handle microblaze rtid r14, 0 */
240 regs->pc = (unsigned long)ka->sa.sa_handler;
245 pr_info("SIG deliver (%s:%d): sp=%p pc=%08lx\n",
246 current->comm, current->pid, frame, regs->pc);
252 force_sigsegv(sig, current);
256 /* Handle restarting system calls */
258 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
261 case -ERESTART_RESTARTBLOCK:
262 case -ERESTARTNOHAND:
268 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
273 case -ERESTARTNOINTR:
275 /* offset of 4 bytes to re-execute trap (brki) instruction */
282 * OK, we're invoking a handler
286 handle_signal(unsigned long sig, struct k_sigaction *ka,
287 siginfo_t *info, struct pt_regs *regs)
289 sigset_t *oldset = sigmask_to_save();
292 /* Set up the stack frame */
293 if (ka->sa.sa_flags & SA_SIGINFO)
294 ret = setup_rt_frame(sig, ka, info, oldset, regs);
296 ret = setup_rt_frame(sig, ka, NULL, oldset, regs);
301 signal_delivered(sig, info, ka, regs,
302 test_thread_flag(TIF_SINGLESTEP));
306 * Note that 'init' is a special process: it doesn't get signals it doesn't
307 * want to handle. Thus you cannot kill init even with a SIGKILL even by
310 * Note that we go through the signals twice: once to check the signals that
311 * the kernel can handle, and then we build all the user-level signal handling
312 * stack-frames in one go after that.
314 static void do_signal(struct pt_regs *regs, int in_syscall)
318 struct k_sigaction ka;
320 pr_info("do signal: %p %d\n", regs, in_syscall);
321 pr_info("do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
322 regs->r12, current_thread_info()->flags);
325 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
327 /* Whee! Actually deliver the signal. */
329 handle_restart(regs, &ka, 1);
330 handle_signal(signr, &ka, &info, regs);
335 handle_restart(regs, NULL, 0);
338 * If there's no signal to deliver, we just put the saved sigmask
341 restore_saved_sigmask();
344 asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall)
346 if (test_thread_flag(TIF_SIGPENDING))
347 do_signal(regs, in_syscall);
349 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
350 tracehook_notify_resume(regs);