64 lines
1.3 KiB
Go
64 lines
1.3 KiB
Go
// Package sbpf implements the Solana Bytecode Format.
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package sbpf
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import "encoding/binary"
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// Hardcoded addresses.
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const (
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VaddrProgram = uint64(0x1_0000_0000)
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VaddrStack = uint64(0x2_0000_0000)
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VaddrHeap = uint64(0x3_0000_0000)
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VaddrInput = uint64(0x4_0000_0000)
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)
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const (
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// SlotSize is the size of one instruction slot.
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SlotSize = 8
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// MinInsSize is the size of the shortest possible instruction
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MinInsSize = SlotSize
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// MaxInsSize is the size of the longest possible instruction (lddw)
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MaxInsSize = 2 * SlotSize
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)
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func IsLongIns(op uint8) bool {
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return op == OpLddw
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}
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// Slot holds the content of one instruction slot.
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type Slot uint64
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// GetSlot reads an instruction slot from memory.
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func GetSlot(buf []byte) Slot {
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return Slot(binary.LittleEndian.Uint64(buf))
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}
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// Op returns the opcode field.
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func (s Slot) Op() uint8 {
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return uint8(s)
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}
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// Dst returns the destination register field.
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func (s Slot) Dst() uint8 {
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return uint8(s>>8) & 0xF
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}
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// Src returns the source register field.
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func (s Slot) Src() uint8 {
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return uint8(s>>12) & 0xF
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}
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// Off returns the offset field.
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func (s Slot) Off() int16 {
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return int16(uint16(s >> 16))
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}
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// Imm returns the immediate field.
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func (s Slot) Imm() int32 {
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return int32(uint32(s >> 32))
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}
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// Uimm returns the immediate field as unsigned.
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func (s Slot) Uimm() uint32 {
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return uint32(s >> 32)
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}
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