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e127a73d41
Linux makes use of the Radix Tree data structure to store pointers indexed by integer values. This structure is utilised across many structures in the kernel including the IRQ descriptor tables, and several filesystems. This module provides a method to lookup values from a structure given its head node. Usage: The function lx_radix_tree_lookup, must be given a symbol of type struct radix_tree_root, and an index into that tree. The object returned is a generic integer value, and must be cast correctly to the type based on the storage in the data structure. For example, to print the irq descriptor in the sparse irq_desc_tree at index 18, try the following: (gdb) print (struct irq_desc)$lx_radix_tree_lookup(irq_desc_tree, 18) Link: http://lkml.kernel.org/r/d2028c55e50cf95a9b7f8ca0d11885174b0cc709.1462865983.git.jan.kiszka@siemens.com Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
1.4 KiB
Python
60 lines
1.4 KiB
Python
/*
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* gdb helper commands and functions for Linux kernel debugging
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*
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* Kernel constants derived from include files.
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*
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* Copyright (c) 2016 Linaro Ltd
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*
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* Authors:
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* Kieran Bingham <kieran.bingham@linaro.org>
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*
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* This work is licensed under the terms of the GNU GPL version 2.
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*
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*/
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/radix-tree.h>
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/* We need to stringify expanded macros so that they can be parsed */
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#define STRING(x) #x
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#define XSTRING(x) STRING(x)
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#define LX_VALUE(x) LX_##x = x
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#define LX_GDBPARSED(x) LX_##x = gdb.parse_and_eval(XSTRING(x))
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/*
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* IS_ENABLED generates (a || b) which is not compatible with python
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* We can only switch on configuration items we know are available
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* Therefore - IS_BUILTIN() is more appropriate
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*/
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#define LX_CONFIG(x) LX_##x = IS_BUILTIN(x)
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/* The build system will take care of deleting everything above this marker */
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<!-- end-c-headers -->
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import gdb
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/* linux/fs.h */
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LX_VALUE(MS_RDONLY)
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LX_VALUE(MS_SYNCHRONOUS)
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LX_VALUE(MS_MANDLOCK)
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LX_VALUE(MS_DIRSYNC)
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LX_VALUE(MS_NOATIME)
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LX_VALUE(MS_NODIRATIME)
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/* linux/mount.h */
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LX_VALUE(MNT_NOSUID)
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LX_VALUE(MNT_NODEV)
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LX_VALUE(MNT_NOEXEC)
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LX_VALUE(MNT_NOATIME)
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LX_VALUE(MNT_NODIRATIME)
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LX_VALUE(MNT_RELATIME)
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/* linux/radix-tree.h */
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LX_VALUE(RADIX_TREE_INDIRECT_PTR)
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LX_GDBPARSED(RADIX_TREE_HEIGHT_MASK)
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LX_GDBPARSED(RADIX_TREE_MAP_SHIFT)
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LX_GDBPARSED(RADIX_TREE_MAP_MASK)
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