mirror of
https://gitlab.os-k.eu/os-k-team/kvisc.git
synced 2023-08-25 14:05:46 +02:00
172 lines
2.9 KiB
Plaintext
172 lines
2.9 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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j ri
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jmp ri
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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 ri
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#
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# Conditional absolute jumps (B)
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#
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# COMPARE($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 rm ri ri
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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 ri
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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 i
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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 rim
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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 r
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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 + 4]
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# will result in:
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# RAX = RBX + RCX + 4
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#
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# Preserves all flags
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#
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lea r m
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#
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# Movement with sign-extension (MOV) instruction
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#
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# $1 = $2
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#
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mov r rim
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mov m ri
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#
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# Movement 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 r r
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movsxw r r
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movsxl r r
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#
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# Movement with zero-extension (MOVZX) instruction
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#
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# $1 = ZeroExtend($2)
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#
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movzx r m
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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 r rm
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#
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# Compare-and-exchange (CMPXCHG) instruction
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#
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# IF ($1 == RAX) THEN
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# $1 = $2
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# ZF = 1
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# ELSE
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# RAX = $1
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# ZF = 0
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# FI
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#
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# Preserves CF, OF and SF
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#
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cmpxchg rm r
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#
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# 3-operand rotation (ROTd)
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#
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# $3 -> $2 -> $1 -> $3 (ROTL)
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# $1 -> $2 -> $3 -> $1 (ROTR)
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#
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rotr rm r r
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rotl rm r r
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