On Thu, 26 Aug 2021 at 15:12, Florian Hauschild <florian.hausch...@fs.ei.tum.de> wrote: > Form my observation all three insn_cb would see x0 == 2. They are > executed at the end of a tb execution.
The documentation for the insn_exec_cb says the cb is called every time an instruction is executed. That won't always be at the end of a TB, will it ? > Please correct me if i am wrong: > When the TB is executed, first the TB cb is executed, then the various > instruction cb. If you would like to see x0 in between instructions (e.g > mov and first add), QEMU need to be in single step mode. > The plugin infrastructure does have some sort of infrastructure to tell > the tcg if the registers are read or written to, but does apparently not > use it. The register values seem to be written back before the various > cbs are called. Any new plugin API for "read/write registers" needs to work correctly at any point where it is valid for it to be called, whether QEMU is in single-step mode or not. I guess we'll wait for Alex to get back from holiday and have a look at this... thanks -- PMM
