go-delve/delve · error

could not get floating point registers

Error message

could not get floating point registers

What it means

Error "could not get floating point registers" thrown in go-delve/delve.

Source

Thrown at pkg/proc/native/registers_darwin_amd64.go:344

		r10:    uint64(state.__r10),
		r11:    uint64(state.__r11),
		r12:    uint64(state.__r12),
		r13:    uint64(state.__r13),
		r14:    uint64(state.__r14),
		r15:    uint64(state.__r15),
		rip:    uint64(state.__rip),
		rflags: uint64(state.__rflags),
		cs:     uint64(state.__cs),
		fs:     uint64(state.__fs),
		gs:     uint64(state.__gs),
		gsBase: uint64(identity.thread_handle),
	}

	// https://opensource.apple.com/source/xnu/xnu-792.13.8/osfmk/mach/i386/thread_status.h?txt
	var fpstate C.x86_float_state64_t
	kret = C.get_fpu_registers(C.mach_port_name_t(thread.os.threadAct), &fpstate)
	if kret != C.KERN_SUCCESS {
		return nil, fmt.Errorf("could not get floating point registers")
	}

	regs.fpregs = proc.AppendUint64Register(regs.fpregs, "CW", uint64(*((*uint16)(unsafe.Pointer(&fpstate.__fpu_fcw)))))
	regs.fpregs = proc.AppendUint64Register(regs.fpregs, "SW", uint64(*((*uint16)(unsafe.Pointer(&fpstate.__fpu_fsw)))))
	regs.fpregs = proc.AppendUint64Register(regs.fpregs, "TW", uint64(fpstate.__fpu_ftw))
	regs.fpregs = proc.AppendUint64Register(regs.fpregs, "FOP", uint64(fpstate.__fpu_fop))
	regs.fpregs = proc.AppendUint64Register(regs.fpregs, "FIP", uint64(fpstate.__fpu_cs)<<32|uint64(fpstate.__fpu_ip))
	regs.fpregs = proc.AppendUint64Register(regs.fpregs, "FDP", uint64(fpstate.__fpu_ds)<<32|uint64(fpstate.__fpu_dp))

	for i, st := range []*C.char{&fpstate.__fpu_stmm0.__mmst_reg[0], &fpstate.__fpu_stmm1.__mmst_reg[0], &fpstate.__fpu_stmm2.__mmst_reg[0], &fpstate.__fpu_stmm3.__mmst_reg[0], &fpstate.__fpu_stmm4.__mmst_reg[0], &fpstate.__fpu_stmm5.__mmst_reg[0], &fpstate.__fpu_stmm6.__mmst_reg[0], &fpstate.__fpu_stmm7.__mmst_reg[0]} {
		stb := C.GoBytes(unsafe.Pointer(st), 10)
		regs.fpregs = proc.AppendBytesRegister(regs.fpregs, fmt.Sprintf("ST(%d)", i), stb)
	}

	regs.fpregs = proc.AppendUint64Register(regs.fpregs, "MXCSR", uint64(fpstate.__fpu_mxcsr))
	regs.fpregs = proc.AppendUint64Register(regs.fpregs, "MXCSR_MASK", uint64(fpstate.__fpu_mxcsrmask))

	for i, xmm := range []*C.char{&fpstate.__fpu_xmm0.__xmm_reg[0], &fpstate.__fpu_xmm1.__xmm_reg[0], &fpstate.__fpu_xmm2.__xmm_reg[0], &fpstate.__fpu_xmm3.__xmm_reg[0], &fpstate.__fpu_xmm4.__xmm_reg[0], &fpstate.__fpu_xmm5.__xmm_reg[0], &fpstate.__fpu_xmm6.__xmm_reg[0], &fpstate.__fpu_xmm7.__xmm_reg[0], &fpstate.__fpu_xmm8.__xmm_reg[0], &fpstate.__fpu_xmm9.__xmm_reg[0], &fpstate.__fpu_xmm10.__xmm_reg[0], &fpstate.__fpu_xmm11.__xmm_reg[0], &fpstate.__fpu_xmm12.__xmm_reg[0], &fpstate.__fpu_xmm13.__xmm_reg[0], &fpstate.__fpu_xmm14.__xmm_reg[0], &fpstate.__fpu_xmm15.__xmm_reg[0]} {

View on GitHub (pinned to a23773e6c3)

When it happens

Trigger: Thrown at pkg/proc/native/registers_darwin_amd64.go:344 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of go-delve/delve@a23773e6c3 (2026-08-31). Data as JSON: /api/errors/cac527fc21310eef. Report an issue: GitHub.