5d8318f323this is the core Forth thing, or a large part of it Force-Push: yes Change-Id: Id15cf5289cb7b41e0ea824ef68791f663c2f90e6
83 lines
2.9 KiB
Text
83 lines
2.9 KiB
Text
HLT will drop you into the debugger
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db 0xf4 ; HLT DO NOT SUBMIT
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or perhaps you want to do a clean exit()
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mov.b rax, 60 ; DO NOT SUBMIT
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mov.b rdi, 0 ; DO NOT SUBMIT
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syscall ; DO NOT SUBMIT
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; opcode c7 is Ev, Iz. c6 is Eb, Ib
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; Eb: ModR/M to follow, byte
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; consider 1100 011w : 11 000 reg : imm
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; also consider 1011 w reg : imm for bytes
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32-bit target, 8-bit source
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match =eax?, target
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db 0xB8
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dd source
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else match =edi?, target
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db 0xBF
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dd source
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64-bit target, 32-bit source
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match =rax?, target ; mov rax, 0x1234
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db 0x48, 0xC7, 0xC0
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dd source
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; 48 eAX REX.W prefix
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; (DEC is the 32-bit meaning, ignore it)
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; eAX -> register identifier,
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; width depends on operand
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; REX.W -> set 64-bit operand mode
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; c7 Grp 11^1A - MOV Ev, Iz
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; immediate to register
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; 1A -> bits 5,4,3 of ModR/M are opcode
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; extension
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; E -> modR/M byte to follow for operand
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; v -> word of appropriate size
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; I -> immediate data
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; z -> 32-bit operand
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; c0 ModR/M byte
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; 0b11000000
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; 11 mod: always 11
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; 000 op/reg: Mov Ev, Iz
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; 00x w absent
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; 0 w (ignored)
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match =rdi, target ; mov rdi, 0x1234
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db 0x48, 0xC7, 0xC7
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dd source
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; 7: 48 c7 c7 2a 00 00 00 mov $0x2a,%rdi
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; 48 eAX REX.W prefix
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; (DEC is the 32-bit meaning, ignore it)
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; c7 Grp 11^1A - MOV Ev, Iz
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; immediate to register
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; 1A -> bits 5,4,3 of ModR/M are opcode
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; extension
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; Ev -> ModR/M to follow for 32-bit operand
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; Iz -> Immediate data, 32-bits
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; c7 ModR/M byte
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; 0b11000111
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; 11 mod: always 11
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; 000 op/reg: Mov Ev, Iz
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; 11x w present
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; 1 w true; use EDI
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64-bit target, 64-bi source
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match =rdi, target ; mov rdi, 0x1234
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db 0x48, 0xB8, 0x38
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dq source
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match =rsi, target
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db 0x48, 0xB8, 0x30
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dq source
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; opcode c7 is Ev, Iz. c6 is Eb, Ib
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; Eb: ModR/M to follow, byte
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; consider 1100 011w : 11 000 reg : imm
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; also consider 1011 w reg : imm for bytes
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