2 * linux/arch/h8300/kernel/signal.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
12 * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
13 * and David McCullough <davidm@snapgear.com>
16 * Linux/m68k by Hamish Macdonald
20 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
21 * Atari :-) Current limitation: Only one sigstack can be active at one time.
22 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
23 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
27 #include <linux/sched.h>
29 #include <linux/kernel.h>
30 #include <linux/signal.h>
31 #include <linux/syscalls.h>
32 #include <linux/errno.h>
33 #include <linux/wait.h>
34 #include <linux/ptrace.h>
35 #include <linux/unistd.h>
36 #include <linux/stddef.h>
37 #include <linux/highuid.h>
38 #include <linux/personality.h>
39 #include <linux/tty.h>
40 #include <linux/binfmts.h>
41 #include <linux/tracehook.h>
43 #include <asm/setup.h>
44 #include <asm/uaccess.h>
45 #include <asm/pgtable.h>
46 #include <asm/traps.h>
47 #include <asm/ucontext.h>
50 * Do a signal return; undo the signal stack.
52 * Keep the return code on the stack quadword aligned!
53 * That makes the cache flush below easier.
60 #if defined(CONFIG_CPU_H8S)
65 struct siginfo *pinfo;
67 unsigned char retcode[8];
71 } __attribute__((aligned(2),packed));
74 restore_sigcontext(struct sigcontext *usc, int *pd0)
76 struct pt_regs *regs = current_pt_regs();
82 /* Always make any pending restarted system calls return -EINTR */
83 current_thread_info()->restart_block.fn = do_no_restart_syscall;
85 #define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
91 ccr = regs->ccr & 0x10;
96 regs->orig_er0 = -1; /* disable syscall checks */
97 err |= __get_user(usp, &usc->sc_usp);
100 err |= __get_user(er0, &usc->sc_er0);
105 asmlinkage int sys_rt_sigreturn(void)
107 unsigned long usp = rdusp();
108 struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
112 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
114 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
117 set_current_blocked(&set);
119 if (restore_sigcontext(&frame->uc.uc_mcontext, &er0))
122 if (restore_altstack(&frame->uc.uc_stack))
128 force_sig(SIGSEGV, current);
132 static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
137 err |= __put_user(regs->er0, &sc->sc_er0);
138 err |= __put_user(regs->er1, &sc->sc_er1);
139 err |= __put_user(regs->er2, &sc->sc_er2);
140 err |= __put_user(regs->er3, &sc->sc_er3);
141 err |= __put_user(regs->er4, &sc->sc_er4);
142 err |= __put_user(regs->er5, &sc->sc_er5);
143 err |= __put_user(regs->er6, &sc->sc_er6);
144 err |= __put_user(rdusp(), &sc->sc_usp);
145 err |= __put_user(regs->pc, &sc->sc_pc);
146 err |= __put_user(regs->ccr, &sc->sc_ccr);
147 err |= __put_user(mask, &sc->sc_mask);
153 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
157 /* Default to using normal stack. */
160 /* This is the X/Open sanctioned signal stack switching. */
161 if (ka->sa.sa_flags & SA_ONSTACK) {
162 if (!sas_ss_flags(usp))
163 usp = current->sas_ss_sp + current->sas_ss_size;
165 return (void *)((usp - frame_size) & -8UL);
168 static int setup_rt_frame (struct ksignal *ksig, sigset_t *set,
169 struct pt_regs *regs)
171 struct rt_sigframe *frame;
177 frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
179 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
182 usig = current_thread_info()->exec_domain
183 && current_thread_info()->exec_domain->signal_invmap
185 ? current_thread_info()->exec_domain->signal_invmap[sig]
188 err |= __put_user(usig, &frame->sig);
192 err |= __put_user(&frame->info, &frame->pinfo);
193 err |= __put_user(&frame->uc, &frame->puc);
194 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
198 /* Create the ucontext. */
199 err |= __put_user(0, &frame->uc.uc_flags);
200 err |= __put_user(0, &frame->uc.uc_link);
201 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
202 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
203 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
207 /* Set up to return from userspace. */
208 ret = frame->retcode;
209 if (ksig->ka.sa.sa_flags & SA_RESTORER)
210 ret = (unsigned char *)(ksig->ka.sa.sa_restorer);
212 /* sub.l er0,er0; mov.b #__NR_rt_sigreturn,r0l; trapa #0 */
213 err |= __put_user(0x1a80f800 + (__NR_rt_sigreturn & 0xff),
214 (unsigned long *)(frame->retcode + 0));
215 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
217 err |= __put_user(ret, &frame->pretcode);
222 /* Set up registers for signal handler */
223 wrusp ((unsigned long) frame);
224 regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
225 regs->er0 = (current_thread_info()->exec_domain
226 && current_thread_info()->exec_domain->signal_invmap
228 ? current_thread_info()->exec_domain->signal_invmap[sig]
230 regs->er1 = (unsigned long)&(frame->info);
231 regs->er2 = (unsigned long)&frame->uc;
232 regs->er5 = current->mm->start_data; /* GOT base */
237 force_sigsegv(sig, current);
242 handle_restart(struct pt_regs *regs, struct k_sigaction *ka)
245 case -ERESTARTNOHAND:
250 case -ERESTART_RESTARTBLOCK:
252 regs->er0 = __NR_restart_syscall;
258 if (!(ka->sa.sa_flags & SA_RESTART)) {
263 case -ERESTARTNOINTR:
265 regs->er0 = regs->orig_er0;
272 * OK, we're invoking a handler
275 handle_signal(struct ksignal *ksig, struct pt_regs * regs)
277 sigset_t *oldset = sigmask_to_save();
279 /* are we from a system call? */
280 if (regs->orig_er0 >= 0)
281 handle_restart(regs, &ksig->ka);
283 ret = setup_rt_frame(ksig, oldset, regs);
285 signal_setup_done(ret, ksig, 0);
289 * Note that 'init' is a special process: it doesn't get signals it doesn't
290 * want to handle. Thus you cannot kill init even with a SIGKILL even by
293 static void do_signal(struct pt_regs *regs)
298 * We want the common case to go fast, which
299 * is why we may in certain cases get here from
300 * kernel mode. Just return without doing anything
303 if ((regs->ccr & 0x10))
306 current->thread.esp0 = (unsigned long) regs;
308 if (get_signal(&ksig)) {
309 /* Whee! Actually deliver the signal. */
310 handle_signal(&ksig, regs);
313 /* Did we come from a system call? */
314 if (regs->orig_er0 >= 0)
315 handle_restart(regs, NULL);
317 /* If there's no signal to deliver, we just restore the saved mask. */
318 restore_saved_sigmask();
321 asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
323 if (thread_info_flags & _TIF_SIGPENDING)
326 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
327 clear_thread_flag(TIF_NOTIFY_RESUME);
328 tracehook_notify_resume(regs);