proc: remove CX method from proc.Registers

It is not used anymore besides internally by the proc/gdbserial
backend.

pkg/proc/fbsdutil/regs.go

@@ -132,11 +132,6 @@ func (r *AMD64Registers) BP() uint64 {
 	return uint64(r.Regs.Rbp)
 }
 
-// CX returns the value of RCX register.
-func (r *AMD64Registers) CX() uint64 {
-	return uint64(r.Regs.Rcx)
-}
-
 // TLS returns the address of the thread local storage memory segment.
 func (r *AMD64Registers) TLS() uint64 {
 	return r.Fsbase

pkg/proc/linutil/regs_amd64_arch.go

@@ -112,11 +112,6 @@ func (r *AMD64Registers) BP() uint64 {
 	return r.Regs.Rbp
 }
 
-// CX returns the value of RCX register.
-func (r *AMD64Registers) CX() uint64 {
-	return r.Regs.Rcx
-}
-
 // TLS returns the address of the thread local storage memory segment.
 func (r *AMD64Registers) TLS() uint64 {
 	return r.Regs.Fs_base

pkg/proc/linutil/regs_arm64_arch.go

@@ -87,11 +87,6 @@ func (r *ARM64Registers) BP() uint64 {
 	return r.Regs.Regs[29]
 }
 
-// CX returns the value of RCX register.
-func (r *ARM64Registers) CX() uint64 {
-	return 0
-}
-
 // TLS returns the address of the thread local storage memory segment.
 func (r *ARM64Registers) TLS() uint64 {
 	return 0

pkg/proc/native/registers_darwin_amd64.go

@@ -100,11 +100,6 @@ func (r *Regs) BP() uint64 {
 	return r.rbp
 }
 
-// CX returns the value of the RCX register.
-func (r *Regs) CX() uint64 {
-	return r.rcx
-}
-
 // TLS returns the value of the register
 // that contains the location of the thread
 // local storage segment.

pkg/proc/registers.go

@@ -18,7 +18,6 @@ type Registers interface {
 	PC() uint64
 	SP() uint64
 	BP() uint64
-	CX() uint64
 	TLS() uint64
 	// GAddr returns the address of the G variable if it is known, 0 and false otherwise
 	GAddr() (uint64, bool)

pkg/proc/winutil/regs.go

@@ -152,11 +152,6 @@ func (r *AMD64Registers) BP() uint64 {
 	return r.rbp
 }
 
-// CX returns the value of the RCX register.
-func (r *AMD64Registers) CX() uint64 {
-	return r.rcx
-}
-
 // TLS returns the value of the register
 // that contains the location of the thread
 // local storage segment.