debuggers.hg

changeset 16509:4deb65519d9b

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x86 emulate: Emulate atomic read-modify-write instructions as a
straightforward write. Hopefully multiprocessor synchronisation is not
relied upon in real mode!
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Nov 26 16:57:57 2007 +0000 (2007-11-26)
parents 11bfa26dd125
children f676c0dacbb9
files xen/arch/x86/hvm/vmx/realmode.c
line diff
     1.1 --- a/xen/arch/x86/hvm/vmx/realmode.c	Mon Nov 26 16:47:10 2007 +0000
     1.2 +++ b/xen/arch/x86/hvm/vmx/realmode.c	Mon Nov 26 16:57:57 2007 +0000
     1.3 @@ -237,7 +237,8 @@ realmode_emulate_cmpxchg(
     1.4      unsigned int bytes,
     1.5      struct x86_emulate_ctxt *ctxt)
     1.6  {
     1.7 -    return X86EMUL_UNHANDLEABLE;
     1.8 +    /* Fix this in case the guest is really relying on r-m-w atomicity. */
     1.9 +    return realmode_emulate_write(seg, offset, new, bytes, ctxt);
    1.10  }
    1.11  
    1.12  static int