Hi folks:
a questions puzzles me during review the qemu code of 5.0.0, take vexpress
emulation arm A9 on RTOS for example.
the emulated RTOS has its own "printf" implementations, so during the qemu
emulations, it would find
helper_le_stl_mmu()
store_helper()
......................
pl011_write();
writev(); //syscall
and finally, the helper would call the pl011_write to emulate the actual stdio
output functions.
but, how did the TCB TB block know this during the translations? there may be
others different "printf" implement ions on different target,
how the tcg knows that a special helper functions need to be called and others
not, from the binary code disassembly language of the emulated target, there is
no
obvious sign to make anyone know which instutions is special and need to
emulation by helper, How get this?
Thank you.
