Am 14.12.2010 um 18:53 schrieb Hollis Blanchard:
On 12/14/2010 12:48 AM, Avi Kivity wrote:
On 12/13/2010 07:17 PM, Hollis Blanchard wrote:
Rewriting is dangerous if the guest is unaware of it. As soon as
it is made aware of it, it might as well actually do it in the
best way that suits it.
Can you list some examples of dangerous scenarios?
- guest jits own kernel code (like Singularity), gets confused when
it reads back something it didn't write
This is getting really hypothetical, but why would a JIT need to
read the generated code?
Mono/ppc actually does that. It generates trampoline functions and
searches emitted code for lis/ori/.../blrl sequences, for instance, to
patch addresses for subsequent invocations.
Andreas
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