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In order to use gdb, launch qemu with the '-s' option. It will wait for a gdb connection:
> qemu -s -kernel arch/i386/boot/bzImage -hda root-2.4.20.img \
-append "root=/dev/hda"
Connected to host network interface: tun0
Waiting gdb connection on port 1234
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1¡£Æô¶¯Qemu,ʹÓôóS²ÎÊý qemu -kernel bzImage -hda linux-0.2.img -append "root=/dev/hda" -S£¬ÏµÍ³»áÌø³öÒ»¸öºÚÏÔʾ½çÃæ£¬ÎÞÈκÎÄÚÈÝ¡£´Ëʱͨ¹ý ctrl+alt+1 Óë ctrl+alt+2¿ÉÒÔÇл»£¬Ò»¸öÊÇÆÁÄ»Êä³ö£¬Ò»¸öÊÇqemu¿ØÖÆÌ¨¡£
2¡£Çл»µ½qemu¿ØÖÆÌ¨£¬ÊäÈëÃüÁîgdbserver 1234
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Then launch gdb on the 'vmlinux' executable:
> gdb vmlinux
In gdb, connect to QEMU:
(gdb) target remote localhost:1234
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