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how to continue from a breakpoint in GNU/Hurd

From: Yue Lu
Subject: how to continue from a breakpoint in GNU/Hurd
Date: Wed, 17 Jul 2013 00:28:14 +0800


I am writing a debugger demo under GNU/Hurd when I study the gdb source code. And I have met a big problem that when I set a breakpoint in the inferior, my code can't resume inferior from it.

I can get the exception message from the mach kernel when the inferior hit the breakpoint. As soon as I got the exception message, I removed the int3, and set the EIP to the previous values, then post a signal zero to the inferior by msg_sig_post_untraced_request(). at last I called thread_resume() to resume it. But thing goes wrong, the inferior is always stops at the breakpoint. and seems never to continue.

I don't know how to fix this, could any of you give me a suggestion? thanks very much.

Yue Lu (陆岳)

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