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is no longer maintained, now struggles to build modern kernels due to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, 187 deletions

diff --git a/arch/metag/kernel/stacktrace.c b/arch/metag/kernel/stacktrace.c
deleted file mode 100644
index 09d67b7..0000000
--- a/arch/metag/kernel/stacktrace.c
+++ /dev/null
@@ -1,187 +0,0 @@
-#include <linux/export.h>
-#include <linux/sched.h>
-#include <linux/sched/debug.h>
-#include <linux/sched/task_stack.h>
-#include <linux/stacktrace.h>
-
-#include <asm/stacktrace.h>
-
-#if defined(CONFIG_FRAME_POINTER)
-
-#ifdef CONFIG_KALLSYMS
-#include <linux/kallsyms.h>
-#include <linux/module.h>
-
-static unsigned long tbi_boing_addr;
-static unsigned long tbi_boing_size;
-
-static void tbi_boing_init(void)
-{
-	/* We need to know where TBIBoingVec is and it's size */
-	unsigned long size;
-	unsigned long offset;
-	char modname[MODULE_NAME_LEN];
-	char name[KSYM_NAME_LEN];
-	tbi_boing_addr = kallsyms_lookup_name("___TBIBoingVec");
-	if (!tbi_boing_addr)
-		tbi_boing_addr = 1;
-	else if (!lookup_symbol_attrs(tbi_boing_addr, &size,
-				      &offset, modname, name))
-		tbi_boing_size = size;
-}
-#endif
-
-/*
- * Unwind the current stack frame and store the new register values in the
- * structure passed as argument. Unwinding is equivalent to a function return,
- * hence the new PC value rather than LR should be used for backtrace.
- */
-int notrace unwind_frame(struct stackframe *frame)
-{
-	struct metag_frame *fp = (struct metag_frame *)frame->fp;
-	unsigned long lr;
-	unsigned long fpnew;
-
-	if (frame->fp & 0x7)
-		return -EINVAL;
-
-	fpnew = fp->fp;
-	lr = fp->lr - 4;
-
-#ifdef CONFIG_KALLSYMS
-	/* If we've reached TBIBoingVec then we're at an interrupt
-	 * entry point or a syscall entry point. The frame pointer
-	 * points to a pt_regs which can be used to continue tracing on
-	 * the other side of the boing.
-	 */
-	if (!tbi_boing_addr)
-		tbi_boing_init();
-	if (tbi_boing_size && lr >= tbi_boing_addr &&
-	    lr < tbi_boing_addr + tbi_boing_size) {
-		struct pt_regs *regs = (struct pt_regs *)fpnew;
-		if (user_mode(regs))
-			return -EINVAL;
-		fpnew = regs->ctx.AX[1].U0;
-		lr = regs->ctx.DX[4].U1;
-	}
-#endif
-
-	/* stack grows up, so frame pointers must decrease */
-	if (fpnew < (ALIGN_DOWN((unsigned long)fp, THREAD_SIZE) +
-		     sizeof(struct thread_info)) || fpnew >= (unsigned long)fp)
-		return -EINVAL;
-
-	/* restore the registers from the stack frame */
-	frame->fp = fpnew;
-	frame->pc = lr;
-
-	return 0;
-}
-#else
-int notrace unwind_frame(struct stackframe *frame)
-{
-	struct metag_frame *sp = (struct metag_frame *)frame->sp;
-
-	if (frame->sp & 0x7)
-		return -EINVAL;
-
-	while (!kstack_end(sp)) {
-		unsigned long addr = sp->lr - 4;
-		sp--;
-
-		if (__kernel_text_address(addr)) {
-			frame->sp = (unsigned long)sp;
-			frame->pc = addr;
-			return 0;
-		}
-	}
-	return -EINVAL;
-}
-#endif
-
-void notrace walk_stackframe(struct stackframe *frame,
-		     int (*fn)(struct stackframe *, void *), void *data)
-{
-	while (1) {
-		int ret;
-
-		if (fn(frame, data))
-			break;
-		ret = unwind_frame(frame);
-		if (ret < 0)
-			break;
-	}
-}
-EXPORT_SYMBOL(walk_stackframe);
-
-#ifdef CONFIG_STACKTRACE
-struct stack_trace_data {
-	struct stack_trace *trace;
-	unsigned int no_sched_functions;
-	unsigned int skip;
-};
-
-static int save_trace(struct stackframe *frame, void *d)
-{
-	struct stack_trace_data *data = d;
-	struct stack_trace *trace = data->trace;
-	unsigned long addr = frame->pc;
-
-	if (data->no_sched_functions && in_sched_functions(addr))
-		return 0;
-	if (data->skip) {
-		data->skip--;
-		return 0;
-	}
-
-	trace->entries[trace->nr_entries++] = addr;
-
-	return trace->nr_entries >= trace->max_entries;
-}
-
-void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
-{
-	struct stack_trace_data data;
-	struct stackframe frame;
-
-	data.trace = trace;
-	data.skip = trace->skip;
-
-	if (tsk != current) {
-#ifdef CONFIG_SMP
-		/*
-		 * What guarantees do we have here that 'tsk' is not
-		 * running on another CPU?  For now, ignore it as we
-		 * can't guarantee we won't explode.
-		 */
-		if (trace->nr_entries < trace->max_entries)
-			trace->entries[trace->nr_entries++] = ULONG_MAX;
-		return;
-#else
-		data.no_sched_functions = 1;
-		frame.fp = thread_saved_fp(tsk);
-		frame.sp = thread_saved_sp(tsk);
-		frame.lr = 0;		/* recovered from the stack */
-		frame.pc = thread_saved_pc(tsk);
-#endif
-	} else {
-		register unsigned long current_sp asm ("A0StP");
-
-		data.no_sched_functions = 0;
-		frame.fp = (unsigned long)__builtin_frame_address(0);
-		frame.sp = current_sp;
-		frame.lr = (unsigned long)__builtin_return_address(0);
-		frame.pc = (unsigned long)save_stack_trace_tsk;
-	}
-
-	walk_stackframe(&frame, save_trace, &data);
-	if (trace->nr_entries < trace->max_entries)
-		trace->entries[trace->nr_entries++] = ULONG_MAX;
-}
-
-void save_stack_trace(struct stack_trace *trace)
-{
-	save_stack_trace_tsk(current, trace);
-}
-EXPORT_SYMBOL_GPL(save_stack_trace);
-#endif