// This assumes the caller's frame is compliant with the host ABI.
// CR and LR are saved into the caller's frame per the host ABI.
// R0 is initialized to $0 as expected by Go.
#define STACK_AND_SAVE_HOST_TO_GO_ABI(extra)                       \
	MOVD	LR, R0                                             \
	MOVD	R0, 16(R1)                                         \
	MOVW	CR, R0                                             \

TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
	// Start with standard C stack frame layout and linkage, allocate
	// 32 bytes of argument space, save callee-save regs, and set R0 to $0.
	STACK_AND_SAVE_HOST_TO_GO_ABI(32)
	// The above will not preserve R2 (TOC). Save it in case Go is
	// compiled without a TOC pointer (e.g -buildmode=default).
	MOVD	R2, 24(R1)

	// Load the current g.
	BL	runtime·load_g(SB)

	BR _main<>(SB)

TEXT _rt0_ppc64le_linux_lib(SB),NOSPLIT|NOFRAME,$0
	// This is called with ELFv2 calling conventions. Convert to Go.
	// Allocate argument storage for call to newosproc0.
	STACK_AND_SAVE_HOST_TO_GO_ABI(16)

	MOVD	R3, _rt0_ppc64le_linux_lib_argc<>(SB)
	MOVD	R4, _rt0_ppc64le_linux_lib_argv<>(SB)

	// Synchronous initialization.
	MOVD	$runtime·libpreinit(SB), R12
	MOVD	R12, CTR
	BL	(CTR)

TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
#endif
	// This is called with ELF calling conventions. Convert to Go.
	// Allocate space for argument storage to call runtime.sigtrampgo.
	STACK_AND_SAVE_HOST_TO_GO_ABI(32)

	// this might be called in external code context,
	// where g is not set.
	MOVBZ	runtime·iscgo(SB), R6
	CMP	R6, $0
	BEQ	2(PC)
	BL	runtime·load_g(SB)

	MOVD	g_m(R11), R3
	MOVD	m_p(R3), R3
	MOVD	p_raceprocctx(R3), R3
	MOVD	R3, (R4)
	RET

rest:
	// Save registers according to the host PPC64 ABI
	// and reserve 16B for argument storage.
	STACK_AND_SAVE_HOST_TO_GO_ABI(16)

	// Load g, and switch to g0 if not already on it.
	MOVD	runtime·tls_g(SB), R10
	MOVD	0(R10), g

	MOVD	g_m(g), R7
	MOVD	m_g0(R7), R8
	CMP	g, R8
	BEQ	noswitch