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proc: support position independent executables (PIE)

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Support for position independent executables (PIE) on the native linux
backend, the gdbserver backend on linux and the core backend.
Also implemented in the windows native backend, but it can't be tested
because go doesn't support PIE on windows yet.
This commit is contained in:
aarzilli
2018-05-29 17:01:51 +02:00
committed by Derek Parker
parent 4e4ed02948
commit 74c98bc961
41 changed files with 467 additions and 161 deletions
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12
pkg/dwarf/reader/variables.go
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@ -6,6 +6,14 @@ import (
"debug/dwarf"
)
// RelAddr is an address relative to the static base. For normal executables
// this is just a normal memory address, for PIE it's a relative address.
type RelAddr uint64
func ToRelAddr(addr uint64, staticBase uint64) RelAddr {
return RelAddr(addr - staticBase)
}
// VariableReader provides a way of reading the local variables and formal
// parameters of a function that are visible at the specified PC address.
type VariableReader struct {
@ -22,10 +30,10 @@ type VariableReader struct {
// Variables returns a VariableReader for the function or lexical block at off.
// If onlyVisible is true only variables visible at pc will be returned by
// the VariableReader.
func Variables(dwarf *dwarf.Data, off dwarf.Offset, pc uint64, line int, onlyVisible bool) *VariableReader {
func Variables(dwarf *dwarf.Data, off dwarf.Offset, pc RelAddr, line int, onlyVisible bool) *VariableReader {
reader := dwarf.Reader()
reader.Seek(off)
return &VariableReader{dwarf: dwarf, reader: reader, entry: nil, depth: 0, onlyVisible: onlyVisible, pc: pc, line: line, err: nil}
return &VariableReader{dwarf: dwarf, reader: reader, entry: nil, depth: 0, onlyVisible: onlyVisible, pc: uint64(pc), line: line, err: nil}
}
// Next reads the next variable entry, returns false if there aren't any.