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package linutil
import (
"bytes"
"encoding/binary"
)
const (
_AT_NULL = 0
_AT_ENTRY = 9
)
// EntryPointFromAuxv searches the elf auxiliary vector for the entry point
// address.
// For a description of the auxiliary vector (auxv) format see:
// System V Application Binary Interface, AMD64 Architecture Processor
// Supplement, section 3.4.3.
// System V Application Binary Interface, Intel386 Architecture Processor
// Supplement (fourth edition), section 3-28.
func EntryPointFromAuxv(auxv []byte, ptrSize int) uint64 {
rd := bytes.NewBuffer(auxv)
for {
tag, err := readUintRaw(rd, binary.LittleEndian, ptrSize)
if err != nil {
return 0
}
val, err := readUintRaw(rd, binary.LittleEndian, ptrSize)
if err != nil {
return 0
}
switch tag {
case _AT_NULL:
return 0
case _AT_ENTRY:
return val
}
}
}
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