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Linux/arch/mips64/mm/tlb-dbg-r4k.c

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 1999 Ralf Baechle
  7  * Copyright (C) 1999 Silicon Graphics, Inc.
  8  *
  9  * TLB debugging routines.  These perform horribly slow but can easily be
 10  * modified for debugging purposes.
 11  */
 12 #include <linux/linkage.h>
 13 #include <linux/kernel.h>
 14 #include <linux/sched.h>
 15 #include <linux/mm.h>
 16 #include <asm/page.h>
 17 #include <asm/pgtable.h>
 18 #include <asm/ptrace.h>
 19 #include <asm/system.h>
 20 
 21 asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 22                               unsigned long address);
 23 
 24 asmlinkage void tlb_refill_debug(struct pt_regs regs)
 25 {
 26         show_regs(&regs);
 27         panic(__FUNCTION__ " called.  This Does Not Happen (TM).");
 28 }
 29 
 30 asmlinkage void xtlb_refill_debug(struct pt_regs *regs)
 31 {
 32         unsigned long addr;
 33         pgd_t *pgd;
 34         pmd_t *pmd;
 35         pte_t *pte;
 36 
 37         addr = regs->cp0_badvaddr & ~((PAGE_SIZE << 1) - 1);
 38         pgd = pgd_offset(current->active_mm, addr);
 39         pmd = pmd_offset(pgd, addr);
 40         pte = pte_offset(pmd, addr);
 41 
 42         write_c0_entrylo0(pte_val(pte[0]) >> 6);
 43         write_c0_entrylo1(pte_val(pte[1]) >> 6);
 44         __asm__ __volatile__("nop;nop;nop");
 45 
 46         tlb_write_random();
 47 }
 48 
 49 asmlinkage void xtlb_mod_debug(struct pt_regs *regs)
 50 {
 51         unsigned long addr;
 52 
 53         addr = regs->cp0_badvaddr;
 54         do_page_fault(regs, 1, addr);
 55 }
 56 
 57 asmlinkage void xtlb_tlbl_debug(struct pt_regs *regs)
 58 {
 59         unsigned long addr;
 60 
 61         addr = regs->cp0_badvaddr;
 62         do_page_fault(regs, 0, addr);
 63 }
 64 
 65 asmlinkage void xtlb_tlbs_debug(struct pt_regs *regs)
 66 {
 67         unsigned long addr;
 68 
 69         addr = regs->cp0_badvaddr;
 70         do_page_fault(regs, 1, addr);
 71 }
 72 

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