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[Qemu-devel] USE_CODE_COPY breaks clone

From: Rafael Ávila de Espíndola
Subject: [Qemu-devel] USE_CODE_COPY breaks clone
Date: Wed, 1 Sep 2004 14:32:40 -0300
User-agent: KMail/1.7

The cvs version of qemu (i386->i386) generates a segmentation fault in the 
emulated code of the attached test program. Commenting the definition of 
USE_CODE_COPY make the test execute successfully.

I think that the problem is in the fact that cpu_init is called in the parent 
process and this functions calls modify_ldt.

Where can I found some documentation about modify_ldt? What is USE_CODE_COPY 
supposed to do?

I will try to call cpu_init from within the new thread and see if it works.

One more question: What do you think about breaking the do_fork function in 
do_fork, do_clone and do_vfork? Presently it tries to guess if it should call 
fork or clone, but do_syscall knows the answer :)

Thanks for any comment,

Attachment: teste.c
Description: Text Data

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