On 10/1/22 13:10, BitFriends wrote:
Hello,
I am trying to create a custom instruction that accesses guest memory specified by an
address in a register. I specifically want to read from that address. So I tried to do
that using "tcg_gen_qemu_ld_i64(&res, env->regs[R_EDI], 0, MO_LEUQ);", but that doesn't
save any result in res.
This statement should have given you compilation errors, so I don't know what you mean by
"doesn't save any result". There's clearly a disconnect between what you describe and
what you actually attempted.
Anyway, by the name you can see that function "gen"erates a "tcg" operation, which is then
later compiled by the jit, the output of which is later executed to produce a result.
Which is, in general, what you want for implementing a custom instruction.
r~
