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Commit c08098f2 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: Last bits (stubs) to get to a running kernel with UART 



This was part of port buildup strategy from Arnd to have a minimal kernel
at first and then add optional features (stacktracing, ptrace, smp,
kprobes, oprofile....)

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent abe11dde

arch/arc/kernel/ptrace.c

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/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/ptrace.h>



void ptrace_disable(struct task_struct *child)

{

}



long arch_ptrace(struct task_struct *child, long request,

		 unsigned long addr, unsigned long data)

{

	int ret = -EIO;

	return ret;

}





const struct user_regset_view *task_user_regset_view(struct task_struct *task)

{

	return (const struct user_regset_view *)NULL;

}

arch/arc/kernel/stacktrace.c

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/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/ptrace.h>

#include <linux/export.h>



/*-------------------------------------------------------------------------

 *              APIs expected by various kernel sub-systems

 *-------------------------------------------------------------------------

 */



noinline void show_stacktrace(struct task_struct *tsk, struct pt_regs *regs)

{

	pr_info("\nStack Trace: NOT Available\n");

}

EXPORT_SYMBOL(show_stacktrace);



/* Expected by sched Code */

void show_stack(struct task_struct *tsk, unsigned long *sp)

{

	show_stacktrace(tsk, NULL);

}



/* Expected by Rest of kernel code */

void dump_stack(void)

{

	show_stacktrace(NULL, NULL);

}

EXPORT_SYMBOL(dump_stack);



/* Another API expected by schedular, shows up in "ps" as Wait Channel

 * Ofcourse just returning schedule( ) would be pointless so unwind until

 * the function is not in schedular code

 */

unsigned int get_wchan(struct task_struct *tsk)

{

	return 0;

}

arch/arc/kernel/troubleshoot.c

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/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 */



#include <linux/ptrace.h>



void show_regs(struct pt_regs *regs)

{

}



void show_kernel_fault_diag(const char *str, struct pt_regs *regs,

			    unsigned long address, unsigned long cause_reg)

{

}