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target-mips: Clean up microMIPS32 major opcode 

I check MIPS microMIPS manual [1], and found the major opcode might
be wrong. I add a comment to explicitly indicate what manual I am refering
to, and according that manual I remove microMIPS32 major opcodes 0x1f.
As for others, like 0x16, 0x17, 0x36 and 0x37, they are for higher-order
MIPS ISA level or new revision of this microMIPS architecture. Quote
from Johnson, they are belong MIPS64 [2].

[1] http://www.mips.com/products/architectures/micromips/#specifications

    MIPS Architecture for Programmers Volume II-B:
      The microMIPS32 Instruction Set (Revision 3.05)

    MD00582-2B-microMIPS-AFP-03.05.pdf

[2] http://www.mips.com/products/architectures/mips64/

    MIPS Architecture For Programmers
      Volume II-A: The MIPS64 Instruction Set

    MD00087-2B-MIPS64BIS-AFP-03.51.pdf

Signed-off-by: Chen Wei-Ren <chenwj@iis.sinica.edu.tw>
Reviewed-by: Eric Johnson <ericj@mips.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
陳韋任 (Wei-Ren Chen) 2012-11-21 14:04:41 +08:00 committed by Aurelien Jarno
parent d132c79f6b
commit 211da99290
1 changed files with 17 additions and 7 deletions
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24
target-mips/translate.c
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@ -10239,9 +10239,19 @@ static int decode_mips16_opc (CPUMIPSState *env, DisasContext *ctx,
return n_bytes;
}
/* microMIPS extension to MIPS32 */
/* microMIPS extension to MIPS32/MIPS64 */
/* microMIPS32 major opcodes */
/*
* microMIPS32/microMIPS64 major opcodes
*
* 1. MIPS Architecture for Programmers Volume II-B:
* The microMIPS32 Instruction Set (Revision 3.05)
*
* Table 6.2 microMIPS32 Encoding of Major Opcode Field
*
* 2. MIPS Architecture For Programmers Volume II-A:
* The MIPS64 Instruction Set (Revision 3.51)
*/
enum {
POOL32A = 0x00,
@ -10268,9 +10278,10 @@ enum {
POOL16D = 0x13,
ORI32 = 0x14,
POOL32F = 0x15,
POOL32S = 0x16,
DADDIU32 = 0x17,
POOL32S = 0x16, /* MIPS64 */
DADDIU32 = 0x17, /* MIPS64 */
/* 0x1f is reserved */
POOL32C = 0x18,
LWGP16 = 0x19,
LW16 = 0x1a,
@ -10278,7 +10289,6 @@ enum {
XORI32 = 0x1c,
JALS32 = 0x1d,
ADDIUPC = 0x1e,
POOL48A = 0x1f,
/* 0x20 is reserved */
RES_20 = 0x20,
@ -10307,8 +10317,8 @@ enum {
B16 = 0x33,
ANDI32 = 0x34,
J32 = 0x35,
SD32 = 0x36,
LD32 = 0x37,
SD32 = 0x36, /* MIPS64 */
LD32 = 0x37, /* MIPS64 */
/* 0x38 and 0x39 are reserved */
RES_38 = 0x38,