metag: Remove arch/metag/

The earliest Meta architecture port of Linux I have a record of was an
import of a Meta port of Linux v2.4.1 in February 2004, which was worked
on significantly over the next few years by Graham Whaley, Will Newton,
Matt Fleming, myself and others.

Eventually the port was merged into mainline in v3.9 in March 2013, not
long after Imagination Technologies bought MIPS Technologies and shifted
its CPU focus over to the MIPS architecture.

As a result, though the port was maintained for a while, kept on life
support for a while longer, and useful for testing a few specific
drivers for which I don't have ready access to the equivalent MIPS
hardware, it is now essentially dead with no users.

It is also stuck using an out-of-tree toolchain based on GCC 4.2.4 which
is no longer maintained, now struggles to build modern kernels due to
toolchain bugs, and doesn't itself build with a modern GCC. The latest
buildroot port is still using an old uClibc snapshot which is no longer
served, and the latest uClibc doesn't build with GCC 4.2.4.

So lets call it a day and drop the Meta architecture port from the
kernel. RIP Meta.

Signed-off-by: James Hogan <jhogan@kernel.org>
Link: https://lkml.kernel.org/r/95906b76-6ce1-3f84-eaba-c29b4ae952eb@roeck-us.net
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Graham Whaley <graham.whaley@gmail.com>
Cc: linux-metag@vger.kernel.org

1 files changed, 0 insertions, 427 deletions

diff --git a/arch/metag/kernel/ptrace.c b/arch/metag/kernel/ptrace.c
deleted file mode 100644
index e615603a4b0a..000000000000
--- a/arch/metag/kernel/ptrace.c
+++ /dev/null
@@ -1,427 +0,0 @@
-/*
- *  Copyright (C) 2005-2012 Imagination Technologies Ltd.
- *
- * This file is subject to the terms and conditions of the GNU General
- * Public License.  See the file COPYING in the main directory of
- * this archive for more details.
- */
-
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/errno.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/regset.h>
-#include <linux/tracehook.h>
-#include <linux/elf.h>
-#include <linux/uaccess.h>
-#include <linux/sched/task_stack.h>
-
-#include <trace/syscall.h>
-
-#define CREATE_TRACE_POINTS
-#include <trace/events/syscalls.h>
-
-/*
- * user_regset definitions.
- */
-
-static unsigned long user_txstatus(const struct pt_regs *regs)
-{
-	unsigned long data = (unsigned long)regs->ctx.Flags;
-
-	if (regs->ctx.SaveMask & TBICTX_CBUF_BIT)
-		data |= USER_GP_REGS_STATUS_CATCH_BIT;
-
-	return data;
-}
-
-int metag_gp_regs_copyout(const struct pt_regs *regs,
-			  unsigned int pos, unsigned int count,
-			  void *kbuf, void __user *ubuf)
-{
-	const void *ptr;
-	unsigned long data;
-	int ret;
-
-	/* D{0-1}.{0-7} */
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-				  regs->ctx.DX, 0, 4*16);
-	if (ret)
-		goto out;
-	/* A{0-1}.{0-1} */
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-				  regs->ctx.AX, 4*16, 4*20);
-	if (ret)
-		goto out;
-	/* A{0-1}.2 */
-	if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
-		ptr = regs->ctx.Ext.Ctx.pExt;
-	else
-		ptr = &regs->ctx.Ext.AX2;
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-				  ptr, 4*20, 4*22);
-	if (ret)
-		goto out;
-	/* A{0-1}.3 */
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-				  &regs->ctx.AX3, 4*22, 4*24);
-	if (ret)
-		goto out;
-	/* PC */
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-				  &regs->ctx.CurrPC, 4*24, 4*25);
-	if (ret)
-		goto out;
-	/* TXSTATUS */
-	data = user_txstatus(regs);
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-				  &data, 4*25, 4*26);
-	if (ret)
-		goto out;
-	/* TXRPT, TXBPOBITS, TXMODE */
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-				  &regs->ctx.CurrRPT, 4*26, 4*29);
-	if (ret)
-		goto out;
-	/* Padding */
-	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
-				       4*29, 4*30);
-out:
-	return ret;
-}
-
-int metag_gp_regs_copyin(struct pt_regs *regs,
-			 unsigned int pos, unsigned int count,
-			 const void *kbuf, const void __user *ubuf)
-{
-	void *ptr;
-	unsigned long data;
-	int ret;
-
-	/* D{0-1}.{0-7} */
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 regs->ctx.DX, 0, 4*16);
-	if (ret)
-		goto out;
-	/* A{0-1}.{0-1} */
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 regs->ctx.AX, 4*16, 4*20);
-	if (ret)
-		goto out;
-	/* A{0-1}.2 */
-	if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
-		ptr = regs->ctx.Ext.Ctx.pExt;
-	else
-		ptr = &regs->ctx.Ext.AX2;
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 ptr, 4*20, 4*22);
-	if (ret)
-		goto out;
-	/* A{0-1}.3 */
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 &regs->ctx.AX3, 4*22, 4*24);
-	if (ret)
-		goto out;
-	/* PC */
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 &regs->ctx.CurrPC, 4*24, 4*25);
-	if (ret)
-		goto out;
-	/* TXSTATUS */
-	data = user_txstatus(regs);
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 &data, 4*25, 4*26);
-	if (ret)
-		goto out;
-	regs->ctx.Flags = data & 0xffff;
-	if (data & USER_GP_REGS_STATUS_CATCH_BIT)
-		regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBUF_BIT;
-	else
-		regs->ctx.SaveMask &= ~TBICTX_CBUF_BIT;
-	/* TXRPT, TXBPOBITS, TXMODE */
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 &regs->ctx.CurrRPT, 4*26, 4*29);
-out:
-	return ret;
-}
-
-static int metag_gp_regs_get(struct task_struct *target,
-			     const struct user_regset *regset,
-			     unsigned int pos, unsigned int count,
-			     void *kbuf, void __user *ubuf)
-{
-	const struct pt_regs *regs = task_pt_regs(target);
-	return metag_gp_regs_copyout(regs, pos, count, kbuf, ubuf);
-}
-
-static int metag_gp_regs_set(struct task_struct *target,
-			     const struct user_regset *regset,
-			     unsigned int pos, unsigned int count,
-			     const void *kbuf, const void __user *ubuf)
-{
-	struct pt_regs *regs = task_pt_regs(target);
-	return metag_gp_regs_copyin(regs, pos, count, kbuf, ubuf);
-}
-
-int metag_cb_regs_copyout(const struct pt_regs *regs,
-			  unsigned int pos, unsigned int count,
-			  void *kbuf, void __user *ubuf)
-{
-	int ret;
-
-	/* TXCATCH{0-3} */
-	if (regs->ctx.SaveMask & TBICTX_XCBF_BIT)
-		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-					  regs->extcb0, 0, 4*4);
-	else
-		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
-					       0, 4*4);
-	return ret;
-}
-
-int metag_cb_regs_copyin(struct pt_regs *regs,
-			 unsigned int pos, unsigned int count,
-			 const void *kbuf, const void __user *ubuf)
-{
-	int ret;
-
-	/* TXCATCH{0-3} */
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 regs->extcb0, 0, 4*4);
-	return ret;
-}
-
-static int metag_cb_regs_get(struct task_struct *target,
-			     const struct user_regset *regset,
-			     unsigned int pos, unsigned int count,
-			     void *kbuf, void __user *ubuf)
-{
-	const struct pt_regs *regs = task_pt_regs(target);
-	return metag_cb_regs_copyout(regs, pos, count, kbuf, ubuf);
-}
-
-static int metag_cb_regs_set(struct task_struct *target,
-			     const struct user_regset *regset,
-			     unsigned int pos, unsigned int count,
-			     const void *kbuf, const void __user *ubuf)
-{
-	struct pt_regs *regs = task_pt_regs(target);
-	return metag_cb_regs_copyin(regs, pos, count, kbuf, ubuf);
-}
-
-int metag_rp_state_copyout(const struct pt_regs *regs,
-			   unsigned int pos, unsigned int count,
-			   void *kbuf, void __user *ubuf)
-{
-	unsigned long mask;
-	u64 *ptr;
-	int ret, i;
-
-	/* Empty read pipeline */
-	if (!(regs->ctx.SaveMask & TBICTX_CBRP_BIT)) {
-		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
-					       0, 4*13);
-		goto out;
-	}
-
-	mask = (regs->ctx.CurrDIVTIME & TXDIVTIME_RPMASK_BITS) >>
-		TXDIVTIME_RPMASK_S;
-
-	/* Read pipeline entries */
-	ptr = (void *)&regs->extcb0[1];
-	for (i = 0; i < 6; ++i, ++ptr) {
-		if (mask & (1 << i))
-			ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-						  ptr, 8*i, 8*(i + 1));
-		else
-			ret = user_regset_copyout_zero(&pos, &count, &kbuf,
-						       &ubuf, 8*i, 8*(i + 1));
-		if (ret)
-			goto out;
-	}
-	/* Mask of entries */
-	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
-				  &mask, 4*12, 4*13);
-out:
-	return ret;
-}
-
-int metag_rp_state_copyin(struct pt_regs *regs,
-			  unsigned int pos, unsigned int count,
-			  const void *kbuf, const void __user *ubuf)
-{
-	struct user_rp_state rp;
-	unsigned long long *ptr;
-	int ret, i;
-
-	if (count < 4*13)
-		return -EINVAL;
-	/* Read the entire pipeline before making any changes */
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-				 &rp, 0, 4*13);
-	if (ret)
-		goto out;
-
-	/* Write pipeline entries */
-	ptr = (void *)&regs->extcb0[1];
-	for (i = 0; i < 6; ++i, ++ptr)
-		if (rp.mask & (1 << i))
-			*ptr = rp.entries[i];
-
-	/* Update RPMask in TXDIVTIME */
-	regs->ctx.CurrDIVTIME &= ~TXDIVTIME_RPMASK_BITS;
-	regs->ctx.CurrDIVTIME |= (rp.mask << TXDIVTIME_RPMASK_S)
-				 & TXDIVTIME_RPMASK_BITS;
-
-	/* Set/clear flags to indicate catch/read pipeline state */
-	if (rp.mask)
-		regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBRP_BIT;
-	else
-		regs->ctx.SaveMask &= ~TBICTX_CBRP_BIT;
-out:
-	return ret;
-}
-
-static int metag_rp_state_get(struct task_struct *target,
-			      const struct user_regset *regset,
-			      unsigned int pos, unsigned int count,
-			      void *kbuf, void __user *ubuf)
-{
-	const struct pt_regs *regs = task_pt_regs(target);
-	return metag_rp_state_copyout(regs, pos, count, kbuf, ubuf);
-}
-
-static int metag_rp_state_set(struct task_struct *target,
-			      const struct user_regset *regset,
-			      unsigned int pos, unsigned int count,
-			      const void *kbuf, const void __user *ubuf)
-{
-	struct pt_regs *regs = task_pt_regs(target);
-	return metag_rp_state_copyin(regs, pos, count, kbuf, ubuf);
-}
-
-static int metag_tls_get(struct task_struct *target,
-			const struct user_regset *regset,
-			unsigned int pos, unsigned int count,
-			void *kbuf, void __user *ubuf)
-{
-	void __user *tls = target->thread.tls_ptr;
-	return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
-}
-
-static int metag_tls_set(struct task_struct *target,
-			const struct user_regset *regset,
-			unsigned int pos, unsigned int count,
-			const void *kbuf, const void __user *ubuf)
-{
-	int ret;
-	void __user *tls = target->thread.tls_ptr;
-
-	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
-	if (ret)
-		return ret;
-
-	target->thread.tls_ptr = tls;
-	return ret;
-}
-
-enum metag_regset {
-	REGSET_GENERAL,
-	REGSET_CBUF,
-	REGSET_READPIPE,
-	REGSET_TLS,
-};
-
-static const struct user_regset metag_regsets[] = {
-	[REGSET_GENERAL] = {
-		.core_note_type = NT_PRSTATUS,
-		.n = ELF_NGREG,
-		.size = sizeof(long),
-		.align = sizeof(long long),
-		.get = metag_gp_regs_get,
-		.set = metag_gp_regs_set,
-	},
-	[REGSET_CBUF] = {
-		.core_note_type = NT_METAG_CBUF,
-		.n = sizeof(struct user_cb_regs) / sizeof(long),
-		.size = sizeof(long),
-		.align = sizeof(long long),
-		.get = metag_cb_regs_get,
-		.set = metag_cb_regs_set,
-	},
-	[REGSET_READPIPE] = {
-		.core_note_type = NT_METAG_RPIPE,
-		.n = sizeof(struct user_rp_state) / sizeof(long),
-		.size = sizeof(long),
-		.align = sizeof(long long),
-		.get = metag_rp_state_get,
-		.set = metag_rp_state_set,
-	},
-	[REGSET_TLS] = {
-		.core_note_type = NT_METAG_TLS,
-		.n = 1,
-		.size = sizeof(void *),
-		.align = sizeof(void *),
-		.get = metag_tls_get,
-		.set = metag_tls_set,
-	},
-};
-
-static const struct user_regset_view user_metag_view = {
-	.name = "metag",
-	.e_machine = EM_METAG,
-	.regsets = metag_regsets,
-	.n = ARRAY_SIZE(metag_regsets)
-};
-
-const struct user_regset_view *task_user_regset_view(struct task_struct *task)
-{
-	return &user_metag_view;
-}
-
-/*
- * Called by kernel/ptrace.c when detaching..
- *
- * Make sure single step bits etc are not set.
- */
-void ptrace_disable(struct task_struct *child)
-{
-	/* nothing to do.. */
-}
-
-long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
-		 unsigned long data)
-{
-	int ret;
-
-	switch (request) {
-	default:
-		ret = ptrace_request(child, request, addr, data);
-		break;
-	}
-
-	return ret;
-}
-
-int syscall_trace_enter(struct pt_regs *regs)
-{
-	int ret = 0;
-
-	if (test_thread_flag(TIF_SYSCALL_TRACE))
-		ret = tracehook_report_syscall_entry(regs);
-
-	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
-		trace_sys_enter(regs, regs->ctx.DX[0].U1);
-
-	return ret ? -1 : regs->ctx.DX[0].U1;
-}
-
-void syscall_trace_leave(struct pt_regs *regs)
-{
-	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
-		trace_sys_exit(regs, regs->ctx.DX[0].U1);
-
-	if (test_thread_flag(TIF_SYSCALL_TRACE))
-		tracehook_report_syscall_exit(regs, 0);
-}