// Store result in libcall
	MOVD	112(R1), R5
	MOVD	R3, (libcall_r1)(R5)
	MOVD	$-1, R6
	CMP	R6, R3
	BNE	skiperrno

	// Save errno in libcall
	BL	runtime·load_g(SB)
	MOVD	g_m(g), R4
	MOVD	(m_mOS + mOS_perrno)(R4), R9
	MOVW	0(R9), R9
	MOVD	R9, (libcall_err)(R5)
	RET
skiperrno:
	// Reset errno if no error has been returned
	MOVD	R0, (libcall_err)(R5)
	RET


TEXT runtime·sigfwd(SB),NOSPLIT,$0-32

skipargs:

	// Call SysV function
	CALL	AX

	// Return result
	POPQ	DI
	MOVQ	AX, libcall_r1(DI)
	MOVQ	DX, libcall_r2(DI)

	get_tls(CX)
	MOVQ	g(CX), BX
	CMPQ	BX, $0
	JEQ	skiperrno2
	MOVQ	g_m(BX), BX
	MOVQ	(m_mOS+mOS_perrno)(BX), AX
	CMPQ	AX, $0
	JEQ	skiperrno2
	MOVL	0(AX), AX
	MOVQ	AX, libcall_err(DI)

skiperrno2:
	RET

// uint32 tstart_sysvicall(M *newm);

	// Call stdcall or cdecl function.
	// DI SI BP BX are preserved, SP is not
	CALL	libcall_fn(BX)
	MOVL	BP, SP

	// Return result.
	MOVL	fn+0(FP), BX
	MOVL	AX, libcall_r1(BX)
	MOVL	DX, libcall_r2(BX)

	// GetLastError().
	MOVL	0x34(FS), AX
	MOVL	AX, libcall_err(BX)

	RET

// faster get/set last error
TEXT runtime·getlasterror(SB),NOSPLIT,$0
	MOVL	0x34(FS), AX
	MOVL	AX, ret+0(FP)
	RET

_0args:

	MOVD	libcall_fn(R19), R12	// branch to libcall->fn
	BL	(R12)

	MOVD	R20, RSP			// free stack space
	MOVD	R0, libcall_r1(R19)		// save return value to libcall->r1
	// TODO(rsc) floating point like amd64 in libcall->r2?

	// GetLastError
	MOVD	TEB_error(R18_PLATFORM), R0
	MOVD	R0, libcall_err(R19)

	// Restore callee-saved registers.
	LDP	16(RSP), (R19, R20)
	RET

TEXT runtime·getlasterror(SB),NOSPLIT,$0

	MOVQ	0(SP), CX
	MOVQ	8(SP), SP
	MOVQ	AX, libcall_r1(CX)
	// Floating point return values are returned in XMM0. Setting r2 to this
	// value in case this call returned a floating point value. For details,
	// see https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention
	MOVQ    X0, libcall_r2(CX)

	// GetLastError().
	MOVQ	0x30(GS), DI
	MOVL	0x68(DI), AX
	MOVQ	AX, libcall_err(CX)

	RET

// faster get/set last error