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76 lines
1.8 KiB
76 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/debugfs.h> |
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#include <linux/efi.h> |
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#include <linux/module.h> |
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#include <linux/seq_file.h> |
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#include <linux/pgtable.h> |
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static int ptdump_show(struct seq_file *m, void *v) |
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{ |
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ptdump_walk_pgd_level_debugfs(m, &init_mm, false); |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(ptdump); |
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static int ptdump_curknl_show(struct seq_file *m, void *v) |
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{ |
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if (current->mm->pgd) |
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ptdump_walk_pgd_level_debugfs(m, current->mm, false); |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(ptdump_curknl); |
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#ifdef CONFIG_PAGE_TABLE_ISOLATION |
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static int ptdump_curusr_show(struct seq_file *m, void *v) |
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{ |
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if (current->mm->pgd) |
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ptdump_walk_pgd_level_debugfs(m, current->mm, true); |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(ptdump_curusr); |
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#endif |
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#if defined(CONFIG_EFI) && defined(CONFIG_X86_64) |
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static int ptdump_efi_show(struct seq_file *m, void *v) |
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{ |
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if (efi_mm.pgd) |
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ptdump_walk_pgd_level_debugfs(m, &efi_mm, false); |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(ptdump_efi); |
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#endif |
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static struct dentry *dir; |
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static int __init pt_dump_debug_init(void) |
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{ |
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dir = debugfs_create_dir("page_tables", NULL); |
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debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops); |
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debugfs_create_file("current_kernel", 0400, dir, NULL, |
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&ptdump_curknl_fops); |
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#ifdef CONFIG_PAGE_TABLE_ISOLATION |
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debugfs_create_file("current_user", 0400, dir, NULL, |
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&ptdump_curusr_fops); |
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#endif |
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#if defined(CONFIG_EFI) && defined(CONFIG_X86_64) |
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debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops); |
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#endif |
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return 0; |
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} |
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static void __exit pt_dump_debug_exit(void) |
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{ |
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debugfs_remove_recursive(dir); |
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} |
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module_init(pt_dump_debug_init); |
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module_exit(pt_dump_debug_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Arjan van de Ven <[email protected]>"); |
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MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");
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