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40 lines
741 B
Go
40 lines
741 B
Go
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package linutil
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import (
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"bytes"
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"encoding/binary"
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)
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const (
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_AT_NULL_AMD64 = 0
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_AT_ENTRY_AMD64 = 9
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)
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// EntryPointFromAuxv searches the elf auxiliary vector for the entry point
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// address.
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// For a description of the auxiliary vector (auxv) format see:
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// System V Application Binary Interface, AMD64 Architecture Processor
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// Supplement, section 3.4.3
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func EntryPointFromAuxvAMD64(auxv []byte) uint64 {
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rd := bytes.NewBuffer(auxv)
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for {
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var tag, val uint64
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err := binary.Read(rd, binary.LittleEndian, &tag)
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if err != nil {
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return 0
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}
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err = binary.Read(rd, binary.LittleEndian, &val)
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if err != nil {
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return 0
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}
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switch tag {
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case _AT_NULL_AMD64:
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return 0
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case _AT_ENTRY_AMD64:
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return val
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}
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}
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}
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