From: Jan Beulich <jbeulich@suse.com>
To: "Cui, Lili" <lili.cui@intel.com>
Cc: "Lu, Hongjiu" <hongjiu.lu@intel.com>,
"binutils@sourceware.org" <binutils@sourceware.org>
Subject: Re: [PATCH 2/8] Support APX GPR32 with extend evex prefix
Date: Thu, 19 Oct 2023 17:24:02 +0200 [thread overview]
Message-ID: <a91d801c-e669-8212-2540-efb30798082a@suse.com> (raw)
In-Reply-To: <SJ0PR11MB5600F9F98FB3FD21CA2DB2939ED4A@SJ0PR11MB5600.namprd11.prod.outlook.com>
On 19.10.2023 13:58, Cui, Lili wrote:
>> -----Original Message-----
>> From: Cui, Lili
>> Sent: Wednesday, October 18, 2023 7:31 PM
>>
>> OK, I'll try to add more checks, and add description for them.
>>
>
> Added some bit checks in the decoder.
>
> --- a/opcodes/i386-dis.c
> +++ b/opcodes/i386-dis.c
> @@ -11533,6 +11642,13 @@ OP_E_memory (instr_info *ins, int bytemode, int sizeflag)
> abort ();
> if (ins->vex.evex)
> {
> + /* S/G EVEX insns require EVEX.P[10] == 1 */
> + if (ins->rex2 & REX_X)
> + {
> + oappend (ins, "(bad)");
> + return true;
> + }
I think I understand this, but ...
> @@ -9003,6 +9003,9 @@ get_valid_dis386 (const struct dis386 *dp, instr_info *ins)
> case 0x4:
> vex_table_index = EVEX_MAP4;
> ins->evex_type = evex_from_legacy;
> + /* EVEX from legacy instrucions require EVEX.P[2:0] must be 0x04. */
> + if (!((*ins->codep & 0x7) == 0x04))
> + return &bad_opcode;
... what's this about? Aren't you in a switch() dealing with the exact same
three bits?
> @@ -9063,6 +9066,22 @@ get_valid_dis386 (const struct dis386 *dp, instr_info *ins)
> }
>
> ins->need_vex = 4;
> +
> + /* EVEX from legacy requrie EVEX.P[17:16] must be 0, EVEX.P[23:21] must
> + be 0.
> + EVEX from evex requrie EVEX.P[17:16] must be 0. EVEX.P[23:22] must
> + be 0, EVEX.P[20] must be 0. */
> + if (ins->evex_type == evex_from_legacy || ins->evex_type == evex_from_vex)
> + {
> + if (!((*ins->codep & 0x3) == 0)
> + || !((*ins->codep >> 6 & 0x3) == 0)
> + || (ins->evex_type == evex_from_legacy
> + && !((*ins->codep >> 5 & 0x1) == 0))
> + || (ins->evex_type == evex_from_vex
> + && !ins->vex.b))
> + return &bad_opcode;
I guess I'm confused here: So far we don't use EVEX.P[] as notation in
comments. Can you please use the respective field names instead? Also
can you please improve readability by converting !(a == b) into a != b?
Jan
next prev parent reply other threads:[~2023-10-19 15:24 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-19 15:25 [PATCH 0/8] [RFC] Support Intel APX EGPR Cui, Lili
2023-09-19 15:25 ` [PATCH 1/8] Support APX GPR32 with rex2 prefix Cui, Lili
2023-09-21 15:27 ` Jan Beulich
2023-09-27 15:57 ` Cui, Lili
2023-09-21 15:51 ` Jan Beulich
2023-09-27 15:59 ` Cui, Lili
2023-09-28 8:02 ` Jan Beulich
2023-10-07 3:27 ` Cui, Lili
2023-09-19 15:25 ` [PATCH 2/8] Support APX GPR32 with extend evex prefix Cui, Lili
2023-09-22 10:12 ` Jan Beulich
2023-10-17 15:48 ` Cui, Lili
2023-10-18 6:40 ` Jan Beulich
2023-10-18 10:44 ` Cui, Lili
2023-10-18 10:50 ` Jan Beulich
2023-09-22 10:50 ` Jan Beulich
2023-10-17 15:50 ` Cui, Lili
2023-10-17 16:11 ` Jan Beulich
2023-10-18 2:02 ` Cui, Lili
2023-10-18 6:10 ` Jan Beulich
2023-09-25 6:03 ` Jan Beulich
2023-10-17 15:52 ` Cui, Lili
2023-10-17 16:12 ` Jan Beulich
2023-10-18 6:31 ` Cui, Lili
2023-10-18 6:47 ` Jan Beulich
2023-10-18 7:52 ` Cui, Lili
2023-10-18 8:21 ` Jan Beulich
2023-10-18 11:30 ` Cui, Lili
2023-10-19 11:58 ` Cui, Lili
2023-10-19 15:24 ` Jan Beulich [this message]
2023-10-19 16:38 ` Cui, Lili
2023-10-20 6:25 ` Jan Beulich
2023-10-22 14:33 ` Cui, Lili
2023-09-19 15:25 ` [PATCH 3/8] Add tests for " Cui, Lili
2023-09-27 13:11 ` Jan Beulich
2023-10-17 15:53 ` FW: " Cui, Lili
2023-10-17 16:19 ` Jan Beulich
2023-10-18 2:32 ` Cui, Lili
2023-10-18 6:05 ` Jan Beulich
2023-10-18 7:16 ` Cui, Lili
2023-10-18 8:05 ` Jan Beulich
2023-10-18 11:26 ` Cui, Lili
2023-10-18 12:06 ` Jan Beulich
2023-10-25 16:03 ` Cui, Lili
2023-09-27 13:19 ` Jan Beulich
2023-09-19 15:25 ` [PATCH 4/8] Support APX NDD Cui, Lili
2023-09-27 14:44 ` Jan Beulich
2023-10-22 14:05 ` Cui, Lili
2023-10-23 7:12 ` Jan Beulich
2023-10-25 8:10 ` Cui, Lili
2023-10-25 8:47 ` Jan Beulich
2023-10-25 15:49 ` Cui, Lili
2023-10-25 15:59 ` Jan Beulich
2023-09-28 7:57 ` Jan Beulich
2023-10-22 14:57 ` Cui, Lili
2023-10-24 11:39 ` Cui, Lili
2023-10-24 11:58 ` Jan Beulich
2023-10-25 15:29 ` Cui, Lili
2023-09-19 15:25 ` [PATCH 5/8] Support APX NDD optimized encoding Cui, Lili
2023-09-28 9:29 ` Jan Beulich
2023-10-23 2:57 ` Hu, Lin1
2023-10-23 7:23 ` Jan Beulich
2023-10-23 7:50 ` Hu, Lin1
2023-10-23 8:15 ` Jan Beulich
2023-10-24 1:40 ` Hu, Lin1
2023-10-24 6:03 ` Jan Beulich
2023-10-24 6:08 ` Hu, Lin1
2023-10-23 3:07 ` [PATCH-V2] " Hu, Lin1
2023-10-23 3:30 ` [PATCH 5/8] [v2] " Hu, Lin1
2023-10-23 7:26 ` Jan Beulich
2023-09-19 15:25 ` [PATCH 6/8] Support APX Push2/Pop2 Cui, Lili
2023-09-28 11:37 ` Jan Beulich
2023-10-30 15:21 ` Cui, Lili
2023-10-30 15:31 ` Jan Beulich
2023-11-20 13:05 ` Cui, Lili
2023-09-19 15:25 ` [PATCH 7/8] Support APX NF Cui, Lili
2023-09-25 6:07 ` Jan Beulich
2023-09-28 12:42 ` Jan Beulich
2023-11-02 10:15 ` Cui, Lili
2023-11-02 10:23 ` Jan Beulich
2023-11-02 10:46 ` Cui, Lili
2023-12-12 2:59 ` H.J. Lu
2023-09-19 15:25 ` [PATCH 8/8] Support APX JMPABS Cui, Lili
2023-09-28 13:11 ` Jan Beulich
2023-11-02 2:32 ` Hu, Lin1
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