利用gdb调试内核程序和用户程序

objdump  -x  obj  以某种分类信息的形式把目标文件的数据组织（被分为几大块）输出   
objdump  -t  obj  输出目标文件的符号表
objdump  -h  obj  输出目标文件的所有段概括
objdump  -j .text/.data -S  obj  输出指定段的信息，大概就是反汇编原始码把

 用户程序调试：

Gdb 使用 gcc –g src.c

B 6 : 在第6行增加断点

n/s 单步到下一行

run 运行

 模块调试：

例：objdump –DSslt ./asd_driver.ko > dump.txt

生成的dump.txt 可以把源码和汇编码对应起来。对应关系不一定完全正确，但可以作为参考。

gdb ../asd_device/asd_driver.ko

(gdb) l  *phydev_map+0x16c

(gdb)info line *phydev_map+0x16c

若call trace 信息中包含了内核的一部分信息，可以如下调试

调试内核：

gdb /lib/modules/2.6.18-prep-gcov/build/vmlinux

GNU gdb Red Hat Linux (6.5-37.el5rh)

Copyright (C) 2006 Free Software Foundation, Inc.

GDB is free software, covered by the GNU General Public License, and you are

welcome to change it and/or distribute copies of it under certain conditions.

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This GDB was configured as "x86_64-redhat-linux-gnu"...Using host libthread_db library "/lib64/libthread_db.so.1".

 

(gdb) l * bio_get_nr_vecs+0x0

0xffffffff8003e705 is in bio_get_nr_vecs (/usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.x86_64/include/linux/blkdev.h:627).

622     extern void blk_execute_rq_nowait(request_queue_t *, struct gendisk *,

623                                       struct request *, int, rq_end_io_fn *);

624

625     static inline request_queue_t *bdev_get_queue(struct block_device *bdev)

626     {

627             return bdev->bd_disk->queue;

628     }

629

630     static inline void blk_run_backing_dev(struct backing_dev_info *bdi,

631                                            struct page *page)