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[69.222.133.165]) by smtp.googlemail.com with ESMTPSA id u6sm3871672ywl.10.2019.07.14.15.39.22 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Sun, 14 Jul 2019 15:39:24 -0700 (PDT) To: Richard Henderson , qemu-devel@nongnu.org References: <20190711223300.6061-1-jan.bobek@gmail.com> <20190711223300.6061-5-jan.bobek@gmail.com> From: Jan Bobek Openpgp: preference=signencrypt Autocrypt: addr=jan.bobek@gmail.com; prefer-encrypt=mutual; keydata= mQINBFbeakcBEACzYOxOXdeT3Ns+5fdSqZFODAb3VXBKQ9DL7ooxLQRhvAx6rKXP/ZkBD7eg q8DJuvx6FbH227wpX+JZQawtolRJO+BTOuyU4ANPn3LGQHNtI78VhjafK7/Geb/9J6mTLl+P iS1EpLjKFbaLQboOaVVCPOHfLJOMNm5Ks9iHVKPQcUWUnroZdm55MIWjRw+wYGpmLD/R+FK/ Cm1fS3j+tu9VYFoEFZmwW//PYzmEtYHpwXA6dOWEd12cu2208/JcEHYBl0Z6Oga0xAk2OxU5 BOELuewGLuSiWik4z594GLVleC2NMnr3gUPl1y8ADrKzQwYmPgytIdsQ0tkV5rK9R1XTk03e ZLViYWJt5dgea+jGWcHPKPfLln53V4nCbwklGFLJQDMo8hL82bjJ7x9bsXoAnkPxJgYHgsM0 LCLewqEIN6khniNv/1vOAKnwoXywlIKsWrx/pFz4xXNLVHoLlkRUl1DeWWzuaha2xEsm0yfe 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X-Received-From: 2607:f8b0:4864:20::c42 Subject: Re: [Qemu-devel] [RISU PATCH v3 04/18] risugen_x86_constraints: add module X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?Q?Alex_Benn=c3=a9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --PMZ8qEvjNN8qnLCWnIeHB4MkpO9GkS60x Content-Type: multipart/mixed; boundary="JSdPuOZxCA78QVHwCyaFYB51OrX865b6C"; protected-headers="v1" From: Jan Bobek To: Richard Henderson , qemu-devel@nongnu.org Cc: =?UTF-8?Q?Alex_Benn=c3=a9e?= Message-ID: Subject: Re: [RISU PATCH v3 04/18] risugen_x86_constraints: add module References: <20190711223300.6061-1-jan.bobek@gmail.com> <20190711223300.6061-5-jan.bobek@gmail.com> In-Reply-To: --JSdPuOZxCA78QVHwCyaFYB51OrX865b6C Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 7/12/19 10:24 AM, Richard Henderson wrote: > On 7/12/19 12:32 AM, Jan Bobek wrote: >> +sub vex($%) >> +{ >> + my ($insn, %vex) =3D @_; >> + my $regidw =3D $is_x86_64 ? 4 : 3; >> + >> + # There is no point in randomizing other VEX fields, since >> + # VEX.R/.X/.B are encoded automatically by risugen_x86_asm, and >> + # VEX.M/.P are opcodes. >> + $vex{l} =3D randint(width =3D> 1) ? 256 : 128 unless defined $vex= {l}; >=20 > VEX.L is sort-of opcode-like as well. It certainly differentiates AVX1= vs > AVX2, and so probably should be constrained somehow. I can't think of = what's > the best way to do that at the moment, since our existing --xstate=3Dfo= o isn't right. >=20 > Perhaps just a FIXME comment for now? So, the instructions that use VEX.L specify it in the !constraints block in the config file. Originally, I thought some instructions are supposed to ignore it (denoted by LIG in the Intel manual -- it's the scalar instructions like ADDSS), so it might be worth randomizing. However, when I later read the manual pages of some of these instructions, it said they are supposed to be encoded with VEX.L=3D0 anyway. I didn't check every single one of them, but right now they are all encoded with VEX.L=3D0, so I suppose this line can be removed and we can rely on the caller (the !constraints block) to always specify it. >> +sub modrm_($%) >> +{ >> + my ($insn, %args) =3D @_; >> + my $regidw =3D $is_x86_64 ? 4 : 3; >> + >> + my %modrm =3D (); >> + if (defined $args{reg}) { >> + # This makes the config file syntax a bit more accommodating >> + # in cases where MODRM.REG is an opcode extension field. >> + $modrm{reg} =3D $args{reg}; >> + } else { >> + $modrm{reg} =3D randint(width =3D> $regidw); >> + } >> + >> + # There is also a displacement-only form, but we don't know >> + # absolute address of the memblock, so we cannot test it. >=20 > 32-bit mode has displacement-only, aka absolute; 64-bit replaces that w= ith > rip-relative. But agreed that the first is impossible to test and the = second > is difficult. >=20 >> +sub modrm($%) >> +{ >> + my ($insn, %args) =3D @_; >> + modrm_($insn, indexk =3D> 'index', %args); >> +} >=20 > How are you avoiding %rsp as index? > I saw you die for that in the previous patch... See write_mem_getoffset in risugen_x86.pm. I felt there's a better place for it there, since that's when we actually need to write to it, so the problem is more exposed. -Jan >=20 > r~ >=20 --JSdPuOZxCA78QVHwCyaFYB51OrX865b6C-- --PMZ8qEvjNN8qnLCWnIeHB4MkpO9GkS60x Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEESPYOqtMR3qRZrEutZeg2ldrjNs8FAl0rrxgACgkQZeg2ldrj Ns9qqg/8DNHqY2o5BMJfjWjmAQVzKBF514iqclESlqNPFYOXMQoDLmog+PY6MYE/ 01nlzYOWJdbf+PcI27pHko4YB+K5rKzsHVpOgsqMRwLxx+ygQlXH4PUNNK1Wy55M jEm5Ge5w+uZcAhsXOBvnk6uOE5vqT/TzdZmad6KNqTEZg68Fimg7LLE2IA6mC7Ln 8qhOEyNU1yPf6PidrzNYGCrnCrn0RIwQuznLY+0xy2i1vA30RXjI2TfATGtxu17p YZUxfZ1MtXkA44icPJ2C3XVtF0t4irHgLg2/k64zKuyXzlqvWORWG7TByhi7V1BW g14CzVu74SRwSwiODasSlgXTYYG7uxL9bUaVNALPpZ5s55EiUoHCyviX5ltzP++I 80yTwf5CVN6FiMhiX422NDrafbNUoYGSCV6aQOac+herq6NojdXX9CD6i3a+QMNw FAmwScS7WOdj5oVRjMlBrJu1SAnb9kxww1vvrQHdk/QJNJHHfrU2miKMS9sKpEO+ b++ckLQiSTRIqBfF5Iwv4CHb4dPOKhXNQLLevCv8twz3U5qzduHLan+W7DxmD3Wk RLFf6+CJbRWx0nOA1gCWuzmtxhfYt55ZQW3rnXvwGAqBhoORcTpY9eP5Lw6kwS4S b8BX7LGQMe0rkiMCyBM16LF32dFFYDpOeBFyLVvWcPqDlBaMIxw= =ZHYy -----END PGP SIGNATURE----- --PMZ8qEvjNN8qnLCWnIeHB4MkpO9GkS60x--