arch: remove tile port

The Tile architecture port was added by Chris Metcalf in 2010, and
maintained until early 2018 when he orphaned it due to his departure
from Mellanox, and nobody else stepped up to maintain it. The product
line is still around in the form of the BlueField SoC, but no longer
uses the Tile architecture.

There are also still products for sale with Tile-GX SoCs, notably the
Mikrotik CCR router family. The products all use old (linux-3.3) kernels
with lots of patches and won't be upgraded by their manufacturers. There
have been efforts to port both OpenWRT and Debian to these, but both
projects have stalled and are very unlikely to be continued in the future.

Given that we are reasonably sure that nobody is still using the port
with an upstream kernel any more, it seems better to remove it now while
the port is in a good shape than to let it bitrot for a few years first.

Cc: Chris Metcalf <chris.d.metcalf@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: http://www.mellanox.com/page/npu_multicore_overview
Link: https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_tilegx_gcc7/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 172 deletions

diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c
deleted file mode 100644
index a703bd0e0488..000000000000
--- a/arch/tile/kernel/compat_signal.c
+++ /dev/null
@@ -1,172 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#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/unistd.h>
-#include <linux/stddef.h>
-#include <linux/personality.h>
-#include <linux/suspend.h>
-#include <linux/ptrace.h>
-#include <linux/elf.h>
-#include <linux/compat.h>
-#include <linux/syscalls.h>
-#include <linux/uaccess.h>
-#include <asm/processor.h>
-#include <asm/ucontext.h>
-#include <asm/sigframe.h>
-#include <asm/syscalls.h>
-#include <asm/vdso.h>
-#include <arch/interrupts.h>
-
-struct compat_ucontext {
-	compat_ulong_t	  uc_flags;
-	compat_uptr_t     uc_link;
-	struct compat_sigaltstack	  uc_stack;
-	struct sigcontext uc_mcontext;
-	sigset_t	  uc_sigmask;	/* mask last for extensibility */
-};
-
-struct compat_rt_sigframe {
-	unsigned char save_area[C_ABI_SAVE_AREA_SIZE]; /* caller save area */
-	struct compat_siginfo info;
-	struct compat_ucontext uc;
-};
-
-/* The assembly shim for this function arranges to ignore the return value. */
-long compat_sys_rt_sigreturn(void)
-{
-	struct pt_regs *regs = current_pt_regs();
-	struct compat_rt_sigframe __user *frame =
-		(struct compat_rt_sigframe __user *) compat_ptr(regs->sp);
-	sigset_t set;
-
-	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 (compat_restore_altstack(&frame->uc.uc_stack))
-		goto badframe;
-
-	return 0;
-
-badframe:
-	signal_fault("bad sigreturn frame", regs, frame, 0);
-	return 0;
-}
-
-/*
- * Determine which stack to use..
- */
-static inline void __user *compat_get_sigframe(struct k_sigaction *ka,
-					       struct pt_regs *regs,
-					       size_t frame_size)
-{
-	unsigned long sp;
-
-	/* Default to using normal stack */
-	sp = (unsigned long)compat_ptr(regs->sp);
-
-	/*
-	 * If we are on the alternate signal stack and would overflow
-	 * it, don't.  Return an always-bogus address instead so we
-	 * will die with SIGSEGV.
-	 */
-	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
-		return (void __user __force *)-1UL;
-
-	/* This is the X/Open sanctioned signal stack switching.  */
-	if (ka->sa.sa_flags & SA_ONSTACK) {
-		if (sas_ss_flags(sp) == 0)
-			sp = current->sas_ss_sp + current->sas_ss_size;
-	}
-
-	sp -= frame_size;
-	/*
-	 * Align the stack pointer according to the TILE ABI,
-	 * i.e. so that on function entry (sp & 15) == 0.
-	 */
-	sp &= -16UL;
-	return (void __user *) sp;
-}
-
-int compat_setup_rt_frame(struct ksignal *ksig, sigset_t *set,
-			  struct pt_regs *regs)
-{
-	unsigned long restorer;
-	struct compat_rt_sigframe __user *frame;
-	int err = 0, sig = ksig->sig;
-
-	frame = compat_get_sigframe(&ksig->ka, regs, sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto err;
-
-	/* Always write at least the signal number for the stack backtracer. */
-	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
-		/* At sigreturn time, restore the callee-save registers too. */
-		err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
-		regs->flags |= PT_FLAGS_RESTORE_REGS;
-	} else {
-		err |= __put_user(ksig->info.si_signo, &frame->info.si_signo);
-	}
-
-	/* Create the ucontext.  */
-	err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
-	err |= __put_user(0, &frame->uc.uc_flags);
-	err |= __put_user(0, &frame->uc.uc_link);
-	err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
-	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-	if (err)
-		goto err;
-
-	restorer = VDSO_SYM(&__vdso_rt_sigreturn);
-	if (ksig->ka.sa.sa_flags & SA_RESTORER)
-		restorer = ptr_to_compat_reg(ksig->ka.sa.sa_restorer);
-
-	/*
-	 * Set up registers for signal handler.
-	 * Registers that we don't modify keep the value they had from
-	 * user-space at the time we took the signal.
-	 * We always pass siginfo and mcontext, regardless of SA_SIGINFO,
-	 * since some things rely on this (e.g. glibc's debug/segfault.c).
-	 */
-	regs->pc = ptr_to_compat_reg(ksig->ka.sa.sa_handler);
-	regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
-	regs->sp = ptr_to_compat_reg(frame);
-	regs->lr = restorer;
-	regs->regs[0] = (unsigned long) sig;
-	regs->regs[1] = ptr_to_compat_reg(&frame->info);
-	regs->regs[2] = ptr_to_compat_reg(&frame->uc);
-	regs->flags |= PT_FLAGS_CALLER_SAVES;
-	return 0;
-
-err:
-	trace_unhandled_signal("bad sigreturn frame", regs,
-			      (unsigned long)frame, SIGSEGV);
-	return -EFAULT;
-}