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