102 lines
2.0 KiB
Go
102 lines
2.0 KiB
Go
package instr
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import (
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"git.elyanpoujol.fr/elyan/central-arch/pkg/register"
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"git.elyanpoujol.fr/elyan/central-arch/pkg/simstate"
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)
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type Instr uint32
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type InstrFormat uint32
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const (
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A InstrFormat = iota
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B
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C
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D1
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D2
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E
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)
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func (instrf InstrFormat) String() string {
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switch instrf {
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case A:
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return "A"
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case B:
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return "B"
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case C:
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return "C"
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case D1:
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return "D1"
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case D2:
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return "D2"
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case E:
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return "E"
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}
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panic("unknown format")
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}
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type Cond uint32
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const (
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AL Cond = iota // Always
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EQ // Equal, Z==1
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NEQ // Not Equal, Z==0
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UGE // Unsigned Greater or Equal, C==1
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CS Cond = iota - 1 // Carry Set, C==1
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ULT // Unsigned Lower Than, C==0
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CC Cond = iota - 2 // Carry Clear, C==0
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NEG // Negative, N==1
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POS // Positive, N==0
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VS // oVerflow Set, V==1
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VC // oVerflow Clear, V==0
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UGT // Unsigned Greater Than, C==1 && Z==0
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ULE // Unsigned Lower Than, C==0 && Z==1
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SGE // Signed Greater or Equal, N==V
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SLT // Signed Lower Than, N!=V
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SGT // Signed Greater Than, Z==0 && N==V
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SLE // Signed Lower or Equal, Z==1 && N!=V
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)
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type InstrFormatter func(*DecodedInstr) string
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type InstrBehavior func(*DecodedInstr, simstate.SimState) error
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type InstrDesc struct {
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VariantName string
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Mnemonic string
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OpCode uint32
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Format InstrFormat
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Formatter InstrFormatter
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Behavior InstrBehavior
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}
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type StandardFormatFields struct {
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Condition Cond
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Rd register.CpuRegister
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Rs1 register.CpuRegister
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Rs2 register.CpuRegister
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Imm uint32
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}
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type SubsystemFormatFields struct {
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Reg register.CpuRegister
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Sid uint32
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Sre uint32
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Cmd uint32
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}
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type DecodedInstr struct {
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Format InstrFormat
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OpCode uint32
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// A, B, C, D1 and D2 formats fields
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StandardFormatFields
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// E format fields
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SubsystemFormatFields
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}
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