On 10/2/22 07:52, BitFriends wrote:
my bad, then I was mislead by "Which is, in general, what you want for implementing a
custom instruction". Also the code around me is full of gen instructions, so I thought
that's what I should use.
So, when reading the doc I found out about the cpu_{ld,st}*
thanks for the clarification, I will look at those insns. My instruction is
for some more advanced logging between guest and host, that should be done
quickly.
Regards
BitFriends
Peter Maydell schrieb am So., 2. Okt. 2022,
16:45:
> On Sun, 2 Oct 2022 at 10:22, BitFriends wrote:
> > I now came
my bad, then I was mislead by "Which is, in general, what you want for
implementing a custom instruction". Also the code around me is full of gen
instructions, so I thought that's what I should use.
So, when reading the doc I found out about the cpu_{ld,st}*_mmu functions.
That sounds more what I
On Sun, 2 Oct 2022 at 10:22, BitFriends wrote:
> I now came up with this code:
>
> TCGv_i64 res = 0;
> TCGv_i64 addr = (TCGv_i64)(env->regs[R_EDI]);
>
> tcg_gen_qemu_ld_i64(res, addr, 0, MO_LEUQ);
>
> env->regs[R_EAX] = (target_ulong)res;
This is wrong, because you cannot read or write env->regs[
On 10/2/22 02:20, BitFriends wrote:
I now came up with this code:
TCGv_i64 res = 0;
TCGv_i64 addr = (TCGv_i64)(env->regs[R_EDI]);
tcg_gen_qemu_ld_i64(res, addr, 0, MO_LEUQ);
env->regs[R_EAX] = (target_ulong)res;
However this crashes afterwards in test_bit. Maybe this is caused by an invalid a
BitFriends writes:
> 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
I now came up with this code:
TCGv_i64 res = 0;
TCGv_i64 addr = (TCGv_i64)(env->regs[R_EDI]);
tcg_gen_qemu_ld_i64(res, addr, 0, MO_LEUQ);
env->regs[R_EAX] = (target_ulong)res;
However this crashes afterwards in test_bit. Maybe this is caused by an
invalid access? Anything wrong about the code?
well, it doesn't give errors, but warnings because of unsigned longs being
converted to TCGv_i64, which exact definiton I cannot find in the qemu
repo. Where is it located? When stepping through the instructions' code,
the value that should be read isn't read. Maybe that'll work when fixing
the war
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 tha
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.
So eit
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