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Re: [Qemu-devel] gcc 4.4 miscompiling cpu_exec() ?

From: Jay Foad
Subject: Re: [Qemu-devel] gcc 4.4 miscompiling cpu_exec() ?
Date: Tue, 23 Feb 2010 17:57:23 +0000

On 23 February 2010 17:03, Aurelien Jarno <address@hidden> wrote:
> Jay Foad a écrit :
>> I'm building QEMU mipsel-linux-user with Ubuntu's GCC 4.4 on an x86
>> host. Whenever I try to run a trivial MIPS executable, QEMU segfaults
>> in cpu_loop() shortly after the call to cpu_mips_exec().
>> The problem seems to be that cpu_exec() doesn't preserve ebp. It tries to:
>>     saved_env_reg = (host_reg_t) env;
>> where env is a global variable decorated with asm("ebp"). This saves
>> ebp to the stack, but later on, in some function inlined into
>> cpu_exec(), the value on the stack gets overwritten with something
>> else.
>> Has anyone else seen this?
> Yes, but only in qemu 0.12.0 to 0.12.1. The issue should be fixed in the
> stable branch and in head.

I'm seeing it today, with sources from git:

commit 724c689357211cb929c9b957e1556f211d2b56db


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