74c98bc961
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.
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
package frame
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import (
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"encoding/binary"
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"fmt"
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"sort"
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)
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// Represents a Common Information Entry in
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// the Dwarf .debug_frame section.
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type CommonInformationEntry struct {
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Length uint32
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CIE_id uint32
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Version uint8
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Augmentation string
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CodeAlignmentFactor uint64
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DataAlignmentFactor int64
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ReturnAddressRegister uint64
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InitialInstructions []byte
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staticBase uint64
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}
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// Represents a Frame Descriptor Entry in the
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// Dwarf .debug_frame section.
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type FrameDescriptionEntry struct {
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Length uint32
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CIE *CommonInformationEntry
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Instructions []byte
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begin, size uint64
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order binary.ByteOrder
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}
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// Returns whether or not the given address is within the
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// bounds of this frame.
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func (fde *FrameDescriptionEntry) Cover(addr uint64) bool {
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return (addr - fde.begin) < fde.size
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}
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// Address of first location for this frame.
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func (fde *FrameDescriptionEntry) Begin() uint64 {
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return fde.begin
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}
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// Address of last location for this frame.
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func (fde *FrameDescriptionEntry) End() uint64 {
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return fde.begin + fde.size
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}
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// Set up frame for the given PC.
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func (fde *FrameDescriptionEntry) EstablishFrame(pc uint64) *FrameContext {
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return executeDwarfProgramUntilPC(fde, pc)
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}
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type FrameDescriptionEntries []*FrameDescriptionEntry
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func NewFrameIndex() FrameDescriptionEntries {
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return make(FrameDescriptionEntries, 0, 1000)
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}
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type ErrNoFDEForPC struct {
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PC uint64
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}
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func (err *ErrNoFDEForPC) Error() string {
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return fmt.Sprintf("could not find FDE for PC %#v", err.PC)
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}
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// Returns the Frame Description Entry for the given PC.
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func (fdes FrameDescriptionEntries) FDEForPC(pc uint64) (*FrameDescriptionEntry, error) {
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idx := sort.Search(len(fdes), func(i int) bool {
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return fdes[i].Cover(pc) || fdes[i].Begin() >= pc
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})
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if idx == len(fdes) || !fdes[idx].Cover(pc) {
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return nil, &ErrNoFDEForPC{pc}
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}
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return fdes[idx], nil
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}
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