Re: [Qemu-devel] Re: Detecting an assembly instruction in QEMU

["Eduardo Felipe" <edusaper@gmail.com>]

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2007/4/25, Atif Hashmi <atifhashmi@gmail.com>:
>
> Instructions like addl %ebx, (%eax) are also considered to be memory
> refernce instructions. Do these type of instructions also refer to the
> functions that you mentioned.


No. You are using __asm_volatile("mov %al %al") to mark the start of your
transaction and __asm_volatile("mov %bl %bl") to mark the end. What I meant
is that your compiler could generate mov %al,%al or mov %bl,%bl in any other
place for whatever reason when it compiles C code. Also your guest OS or any
other program running in it can use these two instructions too. Both cases
would affect in what you intend to do.

Secondly, what is the purpose of undef ASM_SOFTMMU


If ASM_SOFTMMU is defined, pure assembly memory access routines are used
(faster). If it is not defined, alternative C routines are used, which are
slower but easier to modify.

Regards,
Eduardo

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