CRIS: Drop support for the CRIS port

The port was added back in 2000 so it's no longer even a good source
of inspiration for newer ports (if it ever was)

The last SoC (ARTPEC-3) with a CRIS main CPU was launched in 2008.

Coupled with time and working developer board hardware being
in low supply, it's time to drop the port from Linux.

So long and thanks for all the fish!

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 440 deletions

diff --git a/arch/cris/arch-v10/kernel/signal.c b/arch/cris/arch-v10/kernel/signal.c
deleted file mode 100644
index 2beffc37faf8..000000000000
--- a/arch/cris/arch-v10/kernel/signal.c
+++ /dev/null
@@ -1,440 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  linux/arch/cris/kernel/signal.c
- *
- *  Based on arch/i386/kernel/signal.c by
- *     Copyright (C) 1991, 1992  Linus Torvalds
- *     1997-11-28  Modified for POSIX.1b signals by Richard Henderson *
- *
- *  Ideas also taken from arch/arm.
- *
- *  Copyright (C) 2000-2007 Axis Communications AB
- *
- *  Authors:  Bjorn Wesen (bjornw@axis.com)
- *
- */
-
-#include <linux/sched.h>
-#include <linux/sched/task_stack.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 <asm/processor.h>
-#include <asm/ucontext.h>
-#include <linux/uaccess.h>
-#include <arch/system.h>
-
-#define DEBUG_SIG 0
-
-/* a syscall in Linux/CRIS is a break 13 instruction which is 2 bytes */
-/* manipulate regs so that upon return, it will be re-executed */
-
-/* We rely on that pc points to the instruction after "break 13", so the
- * library must never do strange things like putting it in a delay slot.
- */
-#define RESTART_CRIS_SYS(regs) regs->r10 = regs->orig_r10; regs->irp -= 2;
-
-void do_signal(int canrestart, struct pt_regs *regs);
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-struct sigframe {
-	struct sigcontext sc;
-	unsigned long extramask[_NSIG_WORDS-1];
-	unsigned char retcode[8];  /* trampoline code */
-};
-
-struct rt_sigframe {
-	struct siginfo *pinfo;
-	void *puc;
-	struct siginfo info;
-	struct ucontext uc;
-	unsigned char retcode[8];  /* trampoline code */
-};
-
-
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
-{
-	unsigned int err = 0;
-	unsigned long old_usp;
-
-        /* Always make any pending restarted system calls return -EINTR */
-	current->restart_block.fn = do_no_restart_syscall;
-
-	/* restore the regs from &sc->regs (same as sc, since regs is first)
-	 * (sc is already checked for VERIFY_READ since the sigframe was
-	 *  checked in sys_sigreturn previously)
-	 */
-
-	if (__copy_from_user(regs, sc, sizeof(struct pt_regs)))
-                goto badframe;
-
-	/* make sure the U-flag is set so user-mode cannot fool us */
-
-	regs->dccr |= 1 << 8;
-
-	/* restore the old USP as it was before we stacked the sc etc.
-	 * (we cannot just pop the sigcontext since we aligned the sp and
-	 *  stuff after pushing it)
-	 */
-
-	err |= __get_user(old_usp, &sc->usp);
-
-	wrusp(old_usp);
-
-	/* TODO: the other ports use regs->orig_XX to disable syscall checks
-	 * after this completes, but we don't use that mechanism. maybe we can
-	 * use it now ?
-	 */
-
-	return err;
-
-badframe:
-	return 1;
-}
-
-asmlinkage int sys_sigreturn(void)
-{
-	struct pt_regs *regs = current_pt_regs();
-	struct sigframe __user *frame = (struct sigframe *)rdusp();
-	sigset_t set;
-
-        /*
-         * Since we stacked the signal on a dword boundary,
-         * then frame should be dword aligned here.  If it's
-         * not, then the user is trying to mess with us.
-         */
-        if (((long)frame) & 3)
-                goto badframe;
-
-	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;
-
-	set_current_blocked(&set);
-
-	if (restore_sigcontext(regs, &frame->sc))
-		goto badframe;
-
-	/* TODO: SIGTRAP when single-stepping as in arm ? */
-
-	return regs->r10;
-
-badframe:
-	force_sig(SIGSEGV, current);
-	return 0;
-}
-
-asmlinkage int sys_rt_sigreturn(void)
-{
-	struct pt_regs *regs = current_pt_regs();
-	struct rt_sigframe __user *frame = (struct rt_sigframe *)rdusp();
-	sigset_t set;
-
-        /*
-         * Since we stacked the signal on a dword boundary,
-         * then frame should be dword aligned here.  If it's
-         * not, then the user is trying to mess with us.
-         */
-        if (((long)frame) & 3)
-                goto badframe;
-
-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
-		goto badframe;
-	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
-		goto badframe;
-
-	set_current_blocked(&set);
-
-	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
-		goto badframe;
-
-	if (restore_altstack(&frame->uc.uc_stack))
-		goto badframe;
-
-	return regs->r10;
-
-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;
-	unsigned long usp = rdusp();
-
-	/* copy the regs. they are first in sc so we can use sc directly */
-
-	err |= __copy_to_user(sc, regs, sizeof(struct pt_regs));
-
-        /* Set the frametype to CRIS_FRAME_NORMAL for the execution of
-           the signal handler. The frametype will be restored to its previous
-           value in restore_sigcontext. */
-        regs->frametype = CRIS_FRAME_NORMAL;
-
-	/* then some other stuff */
-
-	err |= __put_user(mask, &sc->oldmask);
-
-	err |= __put_user(usp, &sc->usp);
-
-	return err;
-}
-
-/* Figure out where we want to put the new signal frame
- * - usually on the stack. */
-
-static inline void __user *
-get_sigframe(struct ksignal *ksig, size_t frame_size)
-{
-	unsigned long sp = sigsp(rdusp(), ksig);
-
-	/* make sure the frame is dword-aligned */
-
-	sp &= ~3;
-
-	return (void __user*)(sp - frame_size);
-}
-
-/* grab and setup a signal frame.
- *
- * basically we stack a lot of state info, and arrange for the
- * user-mode program to return to the kernel using either a
- * trampoline which performs the syscall sigreturn, or a provided
- * user-mode trampoline.
- */
-
-static int setup_frame(struct ksignal *ksig, sigset_t *set,
-		       struct pt_regs *regs)
-{
-	struct sigframe __user *frame;
-	unsigned long return_ip;
-	int err = 0;
-
-	frame = get_sigframe(ksig, sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		return -EFAULT;
-
-	err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
-	if (err)
-		return -EFAULT;
-
-	if (_NSIG_WORDS > 1) {
-		err |= __copy_to_user(frame->extramask, &set->sig[1],
-				      sizeof(frame->extramask));
-	}
-	if (err)
-		return -EFAULT;
-
-	/* Set up to return from userspace.  If provided, use a stub
-	   already in userspace.  */
-	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
-		return_ip = (unsigned long)ksig->ka.sa.sa_restorer;
-	} else {
-		/* trampoline - the desired return ip is the retcode itself */
-		return_ip = (unsigned long)&frame->retcode;
-		/* This is movu.w __NR_sigreturn, r9; break 13; */
-		err |= __put_user(0x9c5f,         (short __user*)(frame->retcode+0));
-		err |= __put_user(__NR_sigreturn, (short __user*)(frame->retcode+2));
-		err |= __put_user(0xe93d,         (short __user*)(frame->retcode+4));
-	}
-
-	if (err)
-		return -EFAULT;
-
-	/* Set up registers for signal handler */
-
-	regs->irp = (unsigned long) ksig->ka.sa.sa_handler;  /* what we enter NOW   */
-	regs->srp = return_ip;                          /* what we enter LATER */
-	regs->r10 = ksig->sig;                                /* first argument is signo */
-
-	/* actually move the usp to reflect the stacked frame */
-
-	wrusp((unsigned long)frame);
-
-	return 0;
-}
-
-static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
-			  struct pt_regs *regs)
-{
-	struct rt_sigframe __user *frame;
-	unsigned long return_ip;
-	int err = 0;
-
-	frame = get_sigframe(ksig, sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		return -EFAULT;
-
-	err |= __put_user(&frame->info, &frame->pinfo);
-	err |= __put_user(&frame->uc, &frame->puc);
-	err |= copy_siginfo_to_user(&frame->info, &ksig->info);
-	if (err)
-		return -EFAULT;
-
-	/* Clear all the bits of the ucontext we don't use.  */
-        err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
-
-	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
-
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
-	err |= __save_altstack(&frame->uc.uc_stack, rdusp());
-
-	if (err)
-		return -EFAULT;
-
-	/* Set up to return from userspace.  If provided, use a stub
-	   already in userspace.  */
-	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
-		return_ip = (unsigned long)ksig->ka.sa.sa_restorer;
-	} else {
-		/* trampoline - the desired return ip is the retcode itself */
-		return_ip = (unsigned long)&frame->retcode;
-		/* This is movu.w __NR_rt_sigreturn, r9; break 13; */
-		err |= __put_user(0x9c5f, (short __user *)(frame->retcode+0));
-		err |= __put_user(__NR_rt_sigreturn,
-			(short __user *)(frame->retcode+2));
-		err |= __put_user(0xe93d, (short __user *)(frame->retcode+4));
-	}
-
-	if (err)
-		return -EFAULT;
-
-	/* Set up registers for signal handler */
-
-	/* What we enter NOW   */
-	regs->irp = (unsigned long) ksig->ka.sa.sa_handler;
-	/* What we enter LATER */
-	regs->srp = return_ip;
-	/* First argument is signo */
-	regs->r10 = ksig->sig;
-	/* Second argument is (siginfo_t *) */
-	regs->r11 = (unsigned long)&frame->info;
-	/* Third argument is unused */
-	regs->r12 = 0;
-
-	/* Actually move the usp to reflect the stacked frame */
-	wrusp((unsigned long)frame);
-
-	return 0;
-}
-
-/*
- * OK, we're invoking a handler
- */
-
-static inline void handle_signal(int canrestart, struct ksignal *ksig,
-				 struct pt_regs *regs)
-{
-	sigset_t *oldset = sigmask_to_save();
-	int ret;
-
-	/* Are we from a system call? */
-	if (canrestart) {
-		/* If so, check system call restarting.. */
-		switch (regs->r10) {
-		case -ERESTART_RESTARTBLOCK:
-		case -ERESTARTNOHAND:
-			/* ERESTARTNOHAND means that the syscall should
-			 * only be restarted if there was no handler for
-			 * the signal, and since we only get here if there
-			 * is a handler, we don't restart */
-			regs->r10 = -EINTR;
-			break;
-		case -ERESTARTSYS:
-			/* ERESTARTSYS means to restart the syscall if
-			 * there is no handler or the handler was
-			 * registered with SA_RESTART */
-			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
-				regs->r10 = -EINTR;
-				break;
-			}
-		/* fallthrough */
-		case -ERESTARTNOINTR:
-			/* ERESTARTNOINTR means that the syscall should
-			 * be called again after the signal handler returns. */
-			RESTART_CRIS_SYS(regs);
-		}
-	}
-
-	/* Set up the stack frame */
-	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
-		ret = setup_rt_frame(ksig, oldset, regs);
-	else
-		ret = setup_frame(ksig, oldset, regs);
-
-	signal_setup_done(ret, ksig, 0);
-}
-
-/*
- * 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.
- *
- * Also note that the regs structure given here as an argument, is the latest
- * pushed pt_regs. It may or may not be the same as the first pushed registers
- * when the initial usermode->kernelmode transition took place. Therefore
- * we can use user_mode(regs) to see if we came directly from kernel or user
- * mode below.
- */
-
-void do_signal(int canrestart, struct pt_regs *regs)
-{
-	struct ksignal ksig;
-
-	/*
-	 * 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 (get_signal(&ksig)) {
-		/* Whee!  Actually deliver the signal.  */
-		handle_signal(canrestart, &ksig, regs);
-		return;
-	}
-
-	/* Did we come from a system call? */
-	if (canrestart) {
-		/* Restart the system call - no handlers present */
-		if (regs->r10 == -ERESTARTNOHAND ||
-		    regs->r10 == -ERESTARTSYS ||
-		    regs->r10 == -ERESTARTNOINTR) {
-			RESTART_CRIS_SYS(regs);
-		}
-		if (regs->r10 == -ERESTART_RESTARTBLOCK) {
-			regs->r9 = __NR_restart_syscall;
-			regs->irp -= 2;
-		}
-	}
-
-	/* if there's no signal to deliver, we just put the saved sigmask
-	 * back */
-	restore_saved_sigmask();
-}