7d2834a963
When a Go program is externally linked, the external linker is responsible for picking the TLS offset. It records its decision in the runtime.tlsg symbol. Read the offset from that rather than guessing -16. This implementation causes a regression: 1.4 and earlier will no longer work.
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
package proc
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// Arch defines an interface for representing a
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// CPU architecture.
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type Arch interface {
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PtrSize() int
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BreakpointInstruction() []byte
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BreakpointSize() int
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DerefTLS() bool
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}
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// AMD64 represents the AMD64 CPU architecture.
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type AMD64 struct {
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ptrSize int
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breakInstruction []byte
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breakInstructionLen int
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gStructOffset uint64
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hardwareBreakpointUsage []bool
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goos string
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}
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// AMD64Arch returns an initialized AMD64
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// struct.
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func AMD64Arch(goos string) *AMD64 {
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var breakInstr = []byte{0xCC}
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return &AMD64{
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ptrSize: 8,
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breakInstruction: breakInstr,
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breakInstructionLen: len(breakInstr),
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hardwareBreakpointUsage: make([]bool, 4),
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goos: goos,
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}
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}
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// PtrSize returns the size of a pointer
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// on this architecture.
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func (a *AMD64) PtrSize() int {
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return a.ptrSize
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}
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// BreakpointInstruction returns the Breakpoint
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// instruction for this architecture.
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func (a *AMD64) BreakpointInstruction() []byte {
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return a.breakInstruction
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}
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// BreakpointSize returns the size of the
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// breakpoint instruction on this architecture.
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func (a *AMD64) BreakpointSize() int {
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return a.breakInstructionLen
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}
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// If DerefTLS returns true the value of regs.TLS()+GStructOffset() is a
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// pointer to the G struct
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func (a *AMD64) DerefTLS() bool {
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return a.goos == "windows"
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}
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