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Date: Fri, 06 Mar 2009 20:51:40 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] SIGSEGV on Windows with KQEMU enabled
References: <gosfo1$575$1@ger.gmane.org>
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To: qemu-devel@nongnu.org

Consul wrote:
> First, the current SVN (6731) does not compile on Windows due to 
> missing asprintf.

With what toolkit?  It builds for me.

Regards,

Anthony Liguori

> This hack lets me compile the app, but running a Windows XP image 
> gives SIGSEGV during the boot.
> As Robert mentioned in another thread it might be a binutils bug after 
> all - I'm using 2.19 -
> but it might be as well a kqemu bug. The crash happens in kqemu.c. See 
> the trace below.
>
> Note: SIGSEGV does not happens with -no-kqemu
>
> ===================================================================
> --- vnc.c       (revision 6731)
> +++ vnc.c       (working copy)
> @@ -62,10 +62,14 @@
>                    err, gai_strerror(err));
>          return NULL;
>      }
> -
> +#ifndef _WIN32
>      if (asprintf(&addr, format, host, serv) < 0)
>          return NULL;
> -
> +#else
> +    if (!(addr = malloc(512)))
> +        return NULL;
> +    sprintf(addr, format, host, serv);
> +#endif
>      return addr;
>  }
>
> ===================================================================
>
> Starting program: c:\test\qemu/i386-softmmu/qemu.exe -L c:\qemu-dist 
> -hda c:\qemu-img\wxp.q2 -fda c:\qemu-img\boot.bin -boot c -localtime 
> -m 512 -soundhw es1370 -net nic,model=rtl8139 -net tap,ifname=TAP0 
> -kernel-kqemu
> [New thread 3488.0xd48]
> [New thread 3488.0xde0]
> [New thread 3488.0xcb0]
> [New thread 3488.0xfb0]
> [New thread 3488.0xba8]
> [New thread 3488.0x3bc]
> [New thread 3488.0x484]
>
> Program received signal SIGSEGV, Segmentation fault.
> kqemu_cpu_exec (env=0x2ef9eff8) at c:/test/qemu/kqemu.c:475
> 475         asm volatile ("fxrstor %0" : "=m" (*fp));
> (gdb) bt
> #0  kqemu_cpu_exec (env=0x2ef9eff8) at c:/test/qemu/kqemu.c:475
> #1  0x004ac1e6 in cpu_x86_exec (env1=0x806ef000)
>     at c:/test/qemu/cpu-exec.c:317
> #2  0x00407f38 in qemu_get_timedate (tm=<value optimized out>, offset=1)
>     at c:/test/qemu/vl.c:1816
> #3  0x00000000 in ?? ()
> (gdb)
>
>
>
>