148 lines
2.5 KiB
Plaintext
148 lines
2.5 KiB
Plaintext
# 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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#---------------------------------------------------------------------------#
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# Jump instructions #
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#---------------------------------------------------------------------------#
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#
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# Jump (JMP) instruction
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#
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# RIP = $1
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#
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jmp 1
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#
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# RCX-dependent jump (LOOP) instruction
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#
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# IF (RCX > 0) THEN
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# RCX = RCX - 1
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# RIP = $1
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# FI
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#
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loop 1
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#
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# Conditional absolute jumps (B)
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#
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# COMPARE(SignExtend($1), $2)
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#
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# IF (COND) THEN
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# RIP = $3
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# FI
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#
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# Sets CF, OF, ZF and SF according to the comparison's results
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#
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# This instruction is special in that the COND field specified is not evaluated
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# before the instruction is executed, but after the comparison it effectuates
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#
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# Suffixing B with the REP suffix results in undefined behavior
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#
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b 3
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#---------------------------------------------------------------------------#
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# Stack manipulation instructions #
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#---------------------------------------------------------------------------#
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#
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# Unconditional jump with possible return (CALL)
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#
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# PUSH(RIP)
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# JMP(RIP)
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#
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call 1
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xcall2 2
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xcall3 3
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#
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# Return to caller (RET)
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#
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# POP(RIP)
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#
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ret
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#
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# Make new stack frame (ENTER)
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#
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# PUSH(RBP)
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# RBP = RSP
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# RSP = RSP - $1
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#
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enter 1
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#
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# Leave stack frame (LEAVE)
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#
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# RSP = RBP
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# POP(RBP)
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#
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leave
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#
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# PUSH value onto stack
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#
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# RSP = RSP - 8
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# *RSP = $1
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#
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push 1
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#
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# POP value from stack
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#
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# $1 = *RSP
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# RSP = RSP + 8
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#
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pop 1
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#---------------------------------------------------------------------------#
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# Movement instructions #
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#---------------------------------------------------------------------------#
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#
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# Load Effective Address (LEA) instruction
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#
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# $1 = ADDR($2)
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#
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# For instance:
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# LEA RAX, [RBX + RCX * 2 + 4]
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# will result in:
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# RAX = RBX + RCX * 2 + 4
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#
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# Preserves all flags
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#
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lea 2
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#
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# Move data (MOV) instruction
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#
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# $1 = SignExtend($2)
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#
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mov 2
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#
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# Load from memory with zero-extension (MOVSX/MOVZX) instruction
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#
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# $1 = ZeroExtend($2)
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#
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movzx 2
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#
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# Move with sign-extension (MOVSXx) instruction
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#
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# $1 = SignExtend($2 & (2^(8 * sizeof(x)) - 1)
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#
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movsxb 2
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movsxw 2
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movsxd 2
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#
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# Exchange (XCHG) instruction
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#
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# $_ = $1
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# $1 = $2
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# $2 = $_
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#
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xchg 2
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