r4k_tlb_debug.c

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/* $Id: r4k_tlb_debug.c,v 1.2 2000/01/17 23:32:46 ralf Exp $
 *
 * 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.
 *
 * Copyright (C) 1999 Ralf Baechle
 * Copyright (C) 1999 Silicon Graphics, Inc.
 *
 * TLB debugging routines.  These perform horribly slow but can easily be
 * modified for debugging purposes.
 */
#include <linux/linkage.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/ptrace.h>
#include <asm/system.h>

asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
                              unsigned long address);

asmlinkage void tlb_refill_debug(struct pt_regs regs)
{
	show_regs(&regs);
	panic(__FUNCTION__ " called.  This Does Not Happen (TM).");
}

asmlinkage void xtlb_refill_debug(struct pt_regs *regs)
{
	unsigned long addr;
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte;

	addr = regs->cp0_badvaddr & ~((PAGE_SIZE << 1) - 1);
	pgd = pgd_offset(current->active_mm, addr);
	pmd = pmd_offset(pgd, addr);
	pte = pte_offset(pmd, addr);

	set_entrylo0(pte_val(pte[0]) >> 6);
	set_entrylo1(pte_val(pte[1]) >> 6);
	__asm__ __volatile__("nop;nop;nop");

	tlb_write_random();
}

asmlinkage void xtlb_mod_debug(struct pt_regs *regs)
{
	unsigned long addr;

	addr = regs->cp0_badvaddr;
	do_page_fault(regs, 1, addr);
}

asmlinkage void xtlb_tlbl_debug(struct pt_regs *regs)
{
	unsigned long addr;

	addr = regs->cp0_badvaddr;
	do_page_fault(regs, 0, addr);
}

asmlinkage void xtlb_tlbs_debug(struct pt_regs *regs)
{
	unsigned long addr;

	addr = regs->cp0_badvaddr;
	do_page_fault(regs, 1, addr);
}