sh: Move in the SH-5 signal trampoline impl.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 0 insertions, 629 deletions

diff --git a/arch/sh/kernel/signal.c b/arch/sh/kernel/signal.c
deleted file mode 100644
index ca754fd4243..00000000000
--- a/arch/sh/kernel/signal.c
+++ /dev/null
@@ -1,629 +0,0 @@
-/*
- *  linux/arch/sh/kernel/signal.c
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- *
- *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
- *
- *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
- *
- */
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/errno.h>
-#include <linux/wait.h>
-#include <linux/ptrace.h>
-#include <linux/unistd.h>
-#include <linux/stddef.h>
-#include <linux/tty.h>
-#include <linux/elf.h>
-#include <linux/personality.h>
-#include <linux/binfmts.h>
-#include <linux/freezer.h>
-#include <linux/io.h>
-#include <asm/system.h>
-#include <asm/ucontext.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/cacheflush.h>
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int
-sys_sigsuspend(old_sigset_t mask,
-	       unsigned long r5, unsigned long r6, unsigned long r7,
-	       struct pt_regs __regs)
-{
-	mask &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
-	current->saved_sigmask = current->blocked;
-	siginitset(&current->blocked, mask);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
-	current->state = TASK_INTERRUPTIBLE;
-	schedule();
-	set_thread_flag(TIF_RESTORE_SIGMASK);
-	return -ERESTARTNOHAND;
-}
-
-asmlinkage int
-sys_sigaction(int sig, const struct old_sigaction __user *act,
-	      struct old_sigaction __user *oact)
-{
-	struct k_sigaction new_ka, old_ka;
-	int ret;
-
-	if (act) {
-		old_sigset_t mask;
-		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
-		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
-			return -EFAULT;
-		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
-		__get_user(mask, &act->sa_mask);
-		siginitset(&new_ka.sa.sa_mask, mask);
-	}
-
-	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
-	if (!ret && oact) {
-		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
-		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
-			return -EFAULT;
-		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
-	}
-
-	return ret;
-}
-
-asmlinkage int
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
-		unsigned long r6, unsigned long r7,
-		struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-
-	return do_sigaltstack(uss, uoss, regs->regs[15]);
-}
-
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-#define MOVW(n)	 (0x9300|((n)-2))	/* Move mem word at PC+n to R3 */
-#if defined(CONFIG_CPU_SH2)
-#define TRAP_NOARG 0xc320		/* Syscall w/no args (NR in R3) */
-#else
-#define TRAP_NOARG 0xc310		/* Syscall w/no args (NR in R3) */
-#endif
-#define OR_R0_R0 0x200b			/* or r0,r0 (insert to avoid hardware bug) */
-
-struct sigframe
-{
-	struct sigcontext sc;
-	unsigned long extramask[_NSIG_WORDS-1];
-	u16 retcode[8];
-};
-
-struct rt_sigframe
-{
-	struct siginfo info;
-	struct ucontext uc;
-	u16 retcode[8];
-};
-
-#ifdef CONFIG_SH_FPU
-static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
-{
-	struct task_struct *tsk = current;
-
-	if (!(current_cpu_data.flags & CPU_HAS_FPU))
-		return 0;
-
-	set_used_math();
-	return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
-				sizeof(long)*(16*2+2));
-}
-
-static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
-				      struct pt_regs *regs)
-{
-	struct task_struct *tsk = current;
-
-	if (!(current_cpu_data.flags & CPU_HAS_FPU))
-		return 0;
-
-	if (!used_math()) {
-		__put_user(0, &sc->sc_ownedfp);
-		return 0;
-	}
-
-	__put_user(1, &sc->sc_ownedfp);
-
-	/* This will cause a "finit" to be triggered by the next
-	   attempted FPU operation by the 'current' process.
-	   */
-	clear_used_math();
-
-	unlazy_fpu(tsk, regs);
-	return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
-			      sizeof(long)*(16*2+2));
-}
-#endif /* CONFIG_SH_FPU */
-
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
-{
-	unsigned int err = 0;
-
-#define COPY(x)		err |= __get_user(regs->x, &sc->sc_##x)
-			COPY(regs[1]);
-	COPY(regs[2]);	COPY(regs[3]);
-	COPY(regs[4]);	COPY(regs[5]);
-	COPY(regs[6]);	COPY(regs[7]);
-	COPY(regs[8]);	COPY(regs[9]);
-	COPY(regs[10]);	COPY(regs[11]);
-	COPY(regs[12]);	COPY(regs[13]);
-	COPY(regs[14]);	COPY(regs[15]);
-	COPY(gbr);	COPY(mach);
-	COPY(macl);	COPY(pr);
-	COPY(sr);	COPY(pc);
-#undef COPY
-
-#ifdef CONFIG_SH_FPU
-	if (current_cpu_data.flags & CPU_HAS_FPU) {
-		int owned_fp;
-		struct task_struct *tsk = current;
-
-		regs->sr |= SR_FD; /* Release FPU */
-		clear_fpu(tsk, regs);
-		clear_used_math();
-		__get_user (owned_fp, &sc->sc_ownedfp);
-		if (owned_fp)
-			err |= restore_sigcontext_fpu(sc);
-	}
-#endif
-
-	regs->tra = -1;		/* disable syscall checks */
-	err |= __get_user(*r0_p, &sc->sc_regs[0]);
-	return err;
-}
-
-asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
-			     unsigned long r6, unsigned long r7,
-			     struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15];
-	sigset_t set;
-	int r0;
-
-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
-		goto badframe;
-
-	if (__get_user(set.sig[0], &frame->sc.oldmask)
-	    || (_NSIG_WORDS > 1
-		&& __copy_from_user(&set.sig[1], &frame->extramask,
-				    sizeof(frame->extramask))))
-		goto badframe;
-
-	sigdelsetmask(&set, ~_BLOCKABLE);
-
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
-	if (restore_sigcontext(regs, &frame->sc, &r0))
-		goto badframe;
-	return r0;
-
-badframe:
-	force_sig(SIGSEGV, current);
-	return 0;
-}
-
-asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
-				unsigned long r6, unsigned long r7,
-				struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15];
-	sigset_t set;
-	stack_t st;
-	int r0;
-
-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
-		goto badframe;
-
-	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
-		goto badframe;
-
-	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
-	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
-		goto badframe;
-
-	if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
-		goto badframe;
-	/* It is more difficult to avoid calling this function than to
-	   call it and ignore errors.  */
-	do_sigaltstack((const stack_t __user *)&st, NULL, (unsigned long)frame);
-
-	return r0;
-
-badframe:
-	force_sig(SIGSEGV, current);
-	return 0;
-}
-
-/*
- * Set up a signal frame.
- */
-
-static int
-setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
-		 unsigned long mask)
-{
-	int err = 0;
-
-#define COPY(x)		err |= __put_user(regs->x, &sc->sc_##x)
-	COPY(regs[0]);	COPY(regs[1]);
-	COPY(regs[2]);	COPY(regs[3]);
-	COPY(regs[4]);	COPY(regs[5]);
-	COPY(regs[6]);	COPY(regs[7]);
-	COPY(regs[8]);	COPY(regs[9]);
-	COPY(regs[10]);	COPY(regs[11]);
-	COPY(regs[12]);	COPY(regs[13]);
-	COPY(regs[14]);	COPY(regs[15]);
-	COPY(gbr);	COPY(mach);
-	COPY(macl);	COPY(pr);
-	COPY(sr);	COPY(pc);
-#undef COPY
-
-#ifdef CONFIG_SH_FPU
-	err |= save_sigcontext_fpu(sc, regs);
-#endif
-
-	/* non-iBCS2 extensions.. */
-	err |= __put_user(mask, &sc->oldmask);
-
-	return err;
-}
-
-/*
- * Determine which stack to use..
- */
-static inline void __user *
-get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
-{
-	if (ka->sa.sa_flags & SA_ONSTACK) {
-		if (sas_ss_flags(sp) == 0)
-			sp = current->sas_ss_sp + current->sas_ss_size;
-	}
-
-	return (void __user *)((sp - frame_size) & -8ul);
-}
-
-/* These symbols are defined with the addresses in the vsyscall page.
-   See vsyscall-trapa.S.  */
-extern void __user __kernel_sigreturn;
-extern void __user __kernel_rt_sigreturn;
-
-static int setup_frame(int sig, struct k_sigaction *ka,
-			sigset_t *set, struct pt_regs *regs)
-{
-	struct sigframe __user *frame;
-	int err = 0;
-	int signal;
-
-	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto give_sigsegv;
-
-	signal = current_thread_info()->exec_domain
-		&& current_thread_info()->exec_domain->signal_invmap
-		&& sig < 32
-		? current_thread_info()->exec_domain->signal_invmap[sig]
-		: sig;
-
-	err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
-
-	if (_NSIG_WORDS > 1)
-		err |= __copy_to_user(frame->extramask, &set->sig[1],
-				      sizeof(frame->extramask));
-
-	/* Set up to return from userspace.  If provided, use a stub
-	   already in userspace.  */
-	if (ka->sa.sa_flags & SA_RESTORER) {
-		regs->pr = (unsigned long) ka->sa.sa_restorer;
-#ifdef CONFIG_VSYSCALL
-	} else if (likely(current->mm->context.vdso)) {
-		regs->pr = VDSO_SYM(&__kernel_sigreturn);
-#endif
-	} else {
-		/* Generate return code (system call to sigreturn) */
-		err |= __put_user(MOVW(7), &frame->retcode[0]);
-		err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[2]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[3]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[4]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[5]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[6]);
-		err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
-		regs->pr = (unsigned long) frame->retcode;
-	}
-
-	if (err)
-		goto give_sigsegv;
-
-	/* Set up registers for signal handler */
-	regs->regs[15] = (unsigned long) frame;
-	regs->regs[4] = signal; /* Arg for signal handler */
-	regs->regs[5] = 0;
-	regs->regs[6] = (unsigned long) &frame->sc;
-	regs->pc = (unsigned long) ka->sa.sa_handler;
-
-	set_fs(USER_DS);
-
-	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
-		 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
-
-	flush_cache_sigtramp(regs->pr);
-
-	if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
-		flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
-
-	return 0;
-
-give_sigsegv:
-	force_sigsegv(sig, current);
-	return -EFAULT;
-}
-
-static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
-			   sigset_t *set, struct pt_regs *regs)
-{
-	struct rt_sigframe __user *frame;
-	int err = 0;
-	int signal;
-
-	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto give_sigsegv;
-
-	signal = current_thread_info()->exec_domain
-		&& current_thread_info()->exec_domain->signal_invmap
-		&& sig < 32
-		? current_thread_info()->exec_domain->signal_invmap[sig]
-		: sig;
-
-	err |= copy_siginfo_to_user(&frame->info, info);
-
-	/* Create the ucontext.  */
-	err |= __put_user(0, &frame->uc.uc_flags);
-	err |= __put_user(0, &frame->uc.uc_link);
-	err |= __put_user((void *)current->sas_ss_sp,
-			  &frame->uc.uc_stack.ss_sp);
-	err |= __put_user(sas_ss_flags(regs->regs[15]),
-			  &frame->uc.uc_stack.ss_flags);
-	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-	err |= setup_sigcontext(&frame->uc.uc_mcontext,
-			        regs, set->sig[0]);
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
-	/* Set up to return from userspace.  If provided, use a stub
-	   already in userspace.  */
-	if (ka->sa.sa_flags & SA_RESTORER) {
-		regs->pr = (unsigned long) ka->sa.sa_restorer;
-#ifdef CONFIG_VSYSCALL
-	} else if (likely(current->mm->context.vdso)) {
-		regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
-#endif
-	} else {
-		/* Generate return code (system call to rt_sigreturn) */
-		err |= __put_user(MOVW(7), &frame->retcode[0]);
-		err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[2]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[3]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[4]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[5]);
-		err |= __put_user(OR_R0_R0, &frame->retcode[6]);
-		err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
-		regs->pr = (unsigned long) frame->retcode;
-	}
-
-	if (err)
-		goto give_sigsegv;
-
-	/* Set up registers for signal handler */
-	regs->regs[15] = (unsigned long) frame;
-	regs->regs[4] = signal; /* Arg for signal handler */
-	regs->regs[5] = (unsigned long) &frame->info;
-	regs->regs[6] = (unsigned long) &frame->uc;
-	regs->pc = (unsigned long) ka->sa.sa_handler;
-
-	set_fs(USER_DS);
-
-	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
-		 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
-
-	flush_cache_sigtramp(regs->pr);
-
-	if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
-		flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
-
-	return 0;
-
-give_sigsegv:
-	force_sigsegv(sig, current);
-	return -EFAULT;
-}
-
-/*
- * OK, we're invoking a handler
- */
-
-static int
-handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
-	      sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0)
-{
-	int ret;
-
-	/* Are we from a system call? */
-	if (regs->tra >= 0) {
-		/* If so, check system call restarting.. */
-		switch (regs->regs[0]) {
-			case -ERESTART_RESTARTBLOCK:
-			case -ERESTARTNOHAND:
-				regs->regs[0] = -EINTR;
-				break;
-
-			case -ERESTARTSYS:
-				if (!(ka->sa.sa_flags & SA_RESTART)) {
-					regs->regs[0] = -EINTR;
-					break;
-				}
-			/* fallthrough */
-			case -ERESTARTNOINTR:
-				regs->regs[0] = save_r0;
-				regs->pc -= instruction_size(
-						ctrl_inw(regs->pc - 4));
-				break;
-		}
-#ifdef CONFIG_GUSA
-	} else {
-		/* gUSA handling */
-		preempt_disable();
-
-		if (regs->regs[15] >= 0xc0000000) {
-			int offset = (int)regs->regs[15];
-
-			/* Reset stack pointer: clear critical region mark */
-			regs->regs[15] = regs->regs[1];
-			if (regs->pc < regs->regs[0])
-				/* Go to rewind point #1 */
-				regs->pc = regs->regs[0] + offset -
-					instruction_size(ctrl_inw(regs->pc-4));
-		}
-
-		preempt_enable_no_resched();
-#endif
-	}
-
-	/* Set up the stack frame */
-	if (ka->sa.sa_flags & SA_SIGINFO)
-		ret = setup_rt_frame(sig, ka, info, oldset, regs);
-	else
-		ret = setup_frame(sig, ka, oldset, regs);
-
-	if (ka->sa.sa_flags & SA_ONESHOT)
-		ka->sa.sa_handler = SIG_DFL;
-
-	if (ret == 0) {
-		spin_lock_irq(&current->sighand->siglock);
-		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
-		if (!(ka->sa.sa_flags & SA_NODEFER))
-			sigaddset(&current->blocked,sig);
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
-	}
-
-	return ret;
-}
-
-/*
- * Note that 'init' is a special process: it doesn't get signals it doesn't
- * want to handle. Thus you cannot kill init even with a SIGKILL even by
- * mistake.
- *
- * Note that we go through the signals twice: once to check the signals that
- * the kernel can handle, and then we build all the user-level signal handling
- * stack-frames in one go after that.
- */
-static void do_signal(struct pt_regs *regs, unsigned int save_r0)
-{
-	siginfo_t info;
-	int signr;
-	struct k_sigaction ka;
-	sigset_t *oldset;
-
-	/*
-	 * We want the common case to go fast, which
-	 * is why we may in certain cases get here from
-	 * kernel mode. Just return without doing anything
-	 * if so.
-	 */
-	if (!user_mode(regs))
-		return;
-
-	if (try_to_freeze())
-		goto no_signal;
-
-	if (test_thread_flag(TIF_RESTORE_SIGMASK))
-		oldset = &current->saved_sigmask;
-	else
-		oldset = &current->blocked;
-
-	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-	if (signr > 0) {
-		/* Whee!  Actually deliver the signal.  */
-		if (handle_signal(signr, &ka, &info, oldset,
-				  regs, save_r0) == 0) {
-			/* a signal was successfully delivered; the saved
-			 * sigmask will have been stored in the signal frame,
-			 * and will be restored by sigreturn, so we can simply
-			 * clear the TIF_RESTORE_SIGMASK flag */
-			if (test_thread_flag(TIF_RESTORE_SIGMASK))
-				clear_thread_flag(TIF_RESTORE_SIGMASK);
-		}
-
-		return;
-	}
-
- no_signal:
-	/* Did we come from a system call? */
-	if (regs->tra >= 0) {
-		/* Restart the system call - no handlers present */
-		if (regs->regs[0] == -ERESTARTNOHAND ||
-		    regs->regs[0] == -ERESTARTSYS ||
-		    regs->regs[0] == -ERESTARTNOINTR) {
-			regs->regs[0] = save_r0;
-			regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
-		} else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
-			regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
-			regs->regs[3] = __NR_restart_syscall;
-		}
-	}
-
-	/* if there's no signal to deliver, we just put the saved sigmask
-	 * back */
-	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
-		clear_thread_flag(TIF_RESTORE_SIGMASK);
-		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
-	}
-}
-
-asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
-				 __u32 thread_info_flags)
-{
-	/* deal with pending signal delivery */
-	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
-		do_signal(regs, save_r0);
-}