Re: [Qemu-devel] Compilation broken in SVN version and a debug register question

["Blue Swirl" <blauwirbel@gmail.com>]

On 4/23/08, Balazs Attila-Mihaly (Cd-MaN) <x_at_y_or_z@yahoo.com> wrote:
> Hello all.
>
>  I fail to compile the version 4242 from the SVN (which I checked out ~1 hour ago). On an Ubuntu 7.10 host with gcc-3.4 and ./configure --target-list=i386-softmmu, I get the following error:
>
>  make -C i386-softmmu all
>  make[1]: Entering directory `/home/cdman/qemu/trunk/i386-softmmu'
>  gcc-3.4 -Wall -O2 -g -fno-strict-aliasing  -fno-reorder-blocks  -fno-gcse    -fno-optimize-sibling-calls  -fno-crossjumping  -fno-align-labels  -fno-align-jumps  -fno-align-functions   -mpreferred-stack-boundary=2 -fomit-frame-pointer  -m32 -I. -I.. -I/home/cdman/qemu/trunk/target-i386 -I/home/cdman/qemu/trunk -MMD -MP -DNEED_CPU_H -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I/home/cdman/qemu/trunk/tcg -I/home/cdman/qemu/trunk/tcg/i386 -I/home/cdman/qemu/trunk/fpu -DHAS_AUDIO -DHAS_AUDIO_CHOICE -I/home/cdman/qemu/trunk/slirp -c -o op.o /home/cdman/qemu/trunk/target-i386/op.c
>  /home/cdman/qemu/trunk/target-i386/ops_sse.h: In function `op_pshufw_mmx':
>  /home/cdman/qemu/trunk/target-i386/ops_sse.h:597: error: unable to find a register to spill in class `GENERAL_REGS'
>  /home/cdman/qemu/trunk/target-i386/ops_sse.h:597: error: this is the insn:
>  (insn:HI 18 17 19 0 /home/cdman/qemu/trunk/target-i386/ops_sse.h:592 (set (strict_low_part (subreg:HI (reg/v:DI 58 [ r ]) 0))
>         (mem/s/j:HI (plus:SI (mult:SI (reg:SI 62)
>                     (const_int 2 [0x2]))
>                 (reg/v/f:SI 60 [ s ])) [0 <variable>._w S2 A16])) 54 {*movstricthi_1} (insn_list 16 (insn_list 12 (insn_list 50 (nil))))
>     (expr_list:REG_DEAD (reg:SI 62)
>         (nil)))
>  /home/cdman/qemu/trunk/target-i386/ops_sse.h:597: confused by earlier errors, bailing out
>  make[1]: *** [op.o] Error 1
>  make[1]: Leaving directory `/home/cdman/qemu/trunk/i386-softmmu'
>  make: *** [subdir-i386-softmmu] Error 2
>
>  Is this related to the recent discussion about MMX/SSE instructions?

Yes. Maybe the patches here help:
http://lists.gnu.org/archive/html/qemu-devel/2008-03/msg00320.html

>  Also, I have a weird behaviour with qemu-0.9.0 (I will test it against the SVN snapshot as soon as I can get it to compile :)). The behavior is related to hardware breakpoints. I use a Linux host and Windows XP guest and in the guest I use a user-mode debugger (Olly - http://ollydbg.de/) to debug a program. Software breakpoints work ok, but hardware breakpoints only work when I run __with__ kqemu (which is really weird, since the usual response for all the problems is "try it without kqemu" :)). Is this a known limitation or a bug? Should the code which sets the debug registers be augmented to flush the TB cache and the dyngen code changed to take into account the value of the debug registers (and raise an exception there)? But if this is the case, why does it work with kqemu enabled?

No idea. You seem to have a clue, so please experiment.