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->restart_block.fn = do_no_restart_syscall;
94 if (!access_ok(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 ksignal *ksig, struct pt_regs *regs, size_t frame_size)
150 /* Default to using normal stack */
151 unsigned long sp = sigsp(regs->r1, ksig);
153 return (void __user *)((sp - frame_size) & -8UL);
156 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
157 struct pt_regs *regs)
159 struct rt_sigframe __user *frame;
160 int err = 0, sig = ksig->sig;
161 unsigned long address = 0;
167 frame = get_sigframe(ksig, regs, sizeof(*frame));
169 if (!access_ok(frame, sizeof(*frame)))
172 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
173 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
175 /* Create the ucontext. */
176 err |= __put_user(0, &frame->uc.uc_flags);
177 err |= __put_user(NULL, &frame->uc.uc_link);
178 err |= __save_altstack(&frame->uc.uc_stack, regs->r1);
179 err |= setup_sigcontext(&frame->uc.uc_mcontext,
181 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
183 /* Set up to return from userspace. If provided, use a stub
184 already in userspace. */
185 /* minus 8 is offset to cater for "rtsd r15,8" */
186 /* addi r12, r0, __NR_sigreturn */
187 err |= __put_user(0x31800000 | __NR_rt_sigreturn ,
190 err |= __put_user(0xb9cc0008, frame->tramp + 1);
192 /* Return from sighandler will jump to the tramp.
193 Negative 8 offset because return is rtsd r15, 8 */
194 regs->r15 = ((unsigned long)frame->tramp)-8;
196 address = ((unsigned long)frame->tramp);
198 pmdp = pmd_offset(pud_offset(
199 pgd_offset(current->mm, address),
203 ptep = pte_offset_map(pmdp, address);
204 if (pte_present(*ptep)) {
205 address = (unsigned long) page_address(pte_page(*ptep));
206 /* MS: I need add offset in page */
207 address += ((unsigned long)frame->tramp) & ~PAGE_MASK;
208 /* MS address is virtual */
209 address = __virt_to_phys(address);
210 invalidate_icache_range(address, address + 8);
211 flush_dcache_range(address, address + 8);
216 flush_icache_range(address, address + 8);
217 flush_dcache_range(address, address + 8);
222 /* Set up registers for signal handler */
223 regs->r1 = (unsigned long) frame;
225 /* Signal handler args: */
226 regs->r5 = sig; /* arg 0: signum */
227 regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */
228 regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */
229 /* Offset to handle microblaze rtid r14, 0 */
230 regs->pc = (unsigned long)ksig->ka.sa.sa_handler;
233 pr_info("SIG deliver (%s:%d): sp=%p pc=%08lx\n",
234 current->comm, current->pid, frame, regs->pc);
240 /* Handle restarting system calls */
242 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
245 case -ERESTART_RESTARTBLOCK:
246 case -ERESTARTNOHAND:
252 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
257 case -ERESTARTNOINTR:
259 /* offset of 4 bytes to re-execute trap (brki) instruction */
266 * OK, we're invoking a handler
270 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
272 sigset_t *oldset = sigmask_to_save();
275 /* Set up the stack frame */
276 ret = setup_rt_frame(ksig, oldset, regs);
278 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
282 * Note that 'init' is a special process: it doesn't get signals it doesn't
283 * want to handle. Thus you cannot kill init even with a SIGKILL even by
286 * Note that we go through the signals twice: once to check the signals that
287 * the kernel can handle, and then we build all the user-level signal handling
288 * stack-frames in one go after that.
290 static void do_signal(struct pt_regs *regs, int in_syscall)
295 pr_info("do signal: %p %d\n", regs, in_syscall);
296 pr_info("do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
297 regs->r12, current_thread_info()->flags);
300 if (get_signal(&ksig)) {
301 /* Whee! Actually deliver the signal. */
303 handle_restart(regs, &ksig.ka, 1);
304 handle_signal(&ksig, regs);
309 handle_restart(regs, NULL, 0);
312 * If there's no signal to deliver, we just put the saved sigmask
315 restore_saved_sigmask();
318 asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall)
320 if (test_thread_flag(TIF_SIGPENDING))
321 do_signal(regs, in_syscall);
323 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
324 tracehook_notify_resume(regs);