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Commit e66a9512 authored by Harvey Harrison's avatar Harvey Harrison Committed by Ingo Molnar
Browse files

x86: add dump_pagetable helper to X86_32 



Similar to x86 64-bit.

Signed-off-by: default avatarHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 0c42f392

arch/x86/mm/fault_32.c

+39 −33
Original line number Diff line number Diff line
@@ -173,6 +173,44 @@ static void force_sig_info_fault(int si_signo, int si_code, 
	force_sig_info(si_signo, &info, tsk);

}



void dump_pagetable(unsigned long address)

{

	__typeof__(pte_val(__pte(0))) page;



	page = read_cr3();

	page = ((__typeof__(page) *) __va(page))[address >> PGDIR_SHIFT];

#ifdef CONFIG_X86_PAE

	printk("*pdpt = %016Lx ", page);

	if ((page >> PAGE_SHIFT) < max_low_pfn

	    && page & _PAGE_PRESENT) {

		page &= PAGE_MASK;

		page = ((__typeof__(page) *) __va(page))[(address >> PMD_SHIFT)

		                                         & (PTRS_PER_PMD - 1)];

		printk(KERN_CONT "*pde = %016Lx ", page);

		page &= ~_PAGE_NX;

	}

#else

	printk("*pde = %08lx ", page);

#endif



	/*

	 * We must not directly access the pte in the highpte

	 * case if the page table is located in highmem.

	 * And let's rather not kmap-atomic the pte, just in case

	 * it's allocated already.

	 */

	if ((page >> PAGE_SHIFT) < max_low_pfn

	    && (page & _PAGE_PRESENT)

	    && !(page & _PAGE_PSE)) {

		page &= PAGE_MASK;

		page = ((__typeof__(page) *) __va(page))[(address >> PAGE_SHIFT)

		                                         & (PTRS_PER_PTE - 1)];

		printk("*pte = %0*Lx ", sizeof(page)*2, (u64)page);

	}



	printk("\n");

}



void do_invalid_op(struct pt_regs *, unsigned long);



static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
@@ -572,7 +610,6 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) 
	bust_spinlocks(1);



	if (oops_may_print()) {

		__typeof__(pte_val(__pte(0))) page;



#ifdef CONFIG_X86_PAE

		if (error_code & PF_INSTR) {
@@ -593,38 +630,7 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) 
		printk(" at virtual address %08lx\n", address);

		printk(KERN_ALERT "printing ip: %08lx ", regs->ip);



		page = read_cr3();

		page = ((__typeof__(page) *) __va(page))[address >> PGDIR_SHIFT];

#ifdef CONFIG_X86_PAE

		printk("*pdpt = %016Lx ", page);

		if ((page >> PAGE_SHIFT) < max_low_pfn

		    && page & _PAGE_PRESENT) {

			page &= PAGE_MASK;

			page = ((__typeof__(page) *) __va(page))[(address >> PMD_SHIFT)

			                                         & (PTRS_PER_PMD - 1)];

			printk(KERN_CONT "*pde = %016Lx ", page);

			page &= ~_PAGE_NX;

		}

#else

		printk("*pde = %08lx ", page);

#endif



		/*

		 * We must not directly access the pte in the highpte

		 * case if the page table is located in highmem.

		 * And let's rather not kmap-atomic the pte, just in case

		 * it's allocated already.

		 */

		if ((page >> PAGE_SHIFT) < max_low_pfn

		    && (page & _PAGE_PRESENT)

		    && !(page & _PAGE_PSE)) {

			page &= PAGE_MASK;

			page = ((__typeof__(page) *) __va(page))[(address >> PAGE_SHIFT)

			                                         & (PTRS_PER_PTE - 1)];

			printk("*pte = %0*Lx ", sizeof(page)*2, (u64)page);

		}



		printk("\n");

		dump_pagetable(address);

	}



	tsk->thread.cr2 = address;