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f3a191cd73
Implement debugging function for 386 on linux with reference to AMD64. There are a few remaining problems that need to be solved in another time. 1. The stacktrace of cgo are not exactly as expected. 2. Not implement `core` for now. 3. Not implement `call` for now. Can't not find `runtime·debugCallV1` or similar function in $GOROOT/src/runtime/asm_386.s. Update #20
41 lines
841 B
Go
41 lines
841 B
Go
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 = 0
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_AT_ENTRY = 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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// System V Application Binary Interface, Intel386 Architecture Processor
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// Supplement (fourth edition), section 3-28.
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func EntryPointFromAuxv(auxv []byte, ptrSize int) uint64 {
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rd := bytes.NewBuffer(auxv)
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for {
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tag, err := readUintRaw(rd, binary.LittleEndian, ptrSize)
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if err != nil {
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return 0
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}
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val, err := readUintRaw(rd, binary.LittleEndian, ptrSize)
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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:
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return 0
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case _AT_ENTRY:
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return val
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}
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}
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}
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