2019-06-07 22:23:38 +02:00
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# The OS/K Team licenses this file to you under the MIT license.
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# See the LICENSE file in the project root for more information.
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Instruction encoding:
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2019-07-24 16:52:26 +02:00
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Byte 1: Instruction number
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Byte 2:
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xx0xxxxx
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|| └───┘
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RL CND
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Values for ModRMs:
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000xxxxx xxxxx = reg
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(for memory accesses, xxxxx = access size)
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001xxxxx [reg]
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010xxxxx [reg+reg]
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011xxxxx [reg+reg+imm16]
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100xxxxx [reg+reg+imm32]
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101xxxxx [reg+reg*imm8+imm32]
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110xxxxx [reg+imm64]
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11100001 imm8 (zero extended)
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11100010 imm16 (zero extended)
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11100100 imm32 (zero extended)
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11101000 imm64 (zero extended)
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2019-06-07 22:23:38 +02:00
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Values for COND:
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00000 (none)
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2019-07-22 14:41:50 +02:00
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00001 .C .B
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2019-06-07 22:23:38 +02:00
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00010 .O
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00011 .Z .E
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00100 .S
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00101 .P
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2019-07-22 14:41:50 +02:00
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00110 .BE
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00111 .L
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01000 .LE
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01001 .AXZ
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01010 .BXZ
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01011 .CXZ
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01100 .DXZ
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2019-06-07 22:23:38 +02:00
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Highest (6th) bit of COND indicates negation
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