// Save the original return address in a local variable
	MOVD	R30, savedRetAddr-8(SP)

	MOVD	g_m(g), R10

	// Switch to g0 stack.
	MOVD	RSP, R19	// callee-saved, preserved across the CALL
	MOVD	m_g0(R10), R11
	CMP	R11, g
	BEQ	call	// already on g0
	MOVD	(g_sched+gobuf_sp)(R11), R12
	MOVD	R12, RSP
call:
	// Load address of the ret sled into the default register for the return
	// address.
	ADR	ret_sled, R30

	MOVQ	s2+24(FP), RARG2
	MOVQ	result+32(FP), RARG3

	get_tls(R12)
	MOVQ	g(R12), R14
	MOVQ	g_m(R14), R13

	// Switch to g0 stack.
	MOVQ	SP, R12		// callee-saved, preserved across the CALL
	MOVQ	m_g0(R13), R10
	CMPQ	R10, R14
	JE	call	// already on g0
	MOVQ	(g_sched+gobuf_sp)(R10), SP
call:
	ANDQ	$~15, SP	// alignment for gcc ABI
	CALL	AX
	MOVQ	R12, SP
	RET

	ADDV	$const_stackGuard, R1
	MOVV	R1, g_stackguard0(g)
	MOVV	R1, g_stackguard1(g)

	// set the per-goroutine and per-mach "registers"
	MOVV	$runtime·m0(SB), R1

	// save m->g0 = g0
	MOVV	g, m_g0(R1)
	// save m0 to g0->m
	MOVV	R1, g_m(g)

	JAL	runtime·check(SB)

	// args are already prepared
	JAL	runtime·args(SB)
	JAL	runtime·osinit(SB)
	JAL	runtime·schedinit(SB)

#include "go_asm.h"
#include "go_tls.h"
#include "funcdata.h"
#include "textflag.h"

TEXT runtime·rt0_go(SB), NOSPLIT|NOFRAME|TOPFRAME, $0
	// save m->g0 = g0
	MOVD $runtime·g0(SB), runtime·m0+m_g0(SB)
	// save m0 to g0->m
	MOVD $runtime·m0(SB), runtime·g0+g_m(SB)
	// set g to g0
	MOVD $runtime·g0(SB), g
	CALLNORESUME runtime·check(SB)
#ifdef GOOS_js
	CALLNORESUME runtime·args(SB)
#endif

	ADD	$const_stackGuard, T0
	MOV	T0, g_stackguard0(g)
	MOV	T0, g_stackguard1(g)

	// set the per-goroutine and per-mach "registers"
	MOV	$runtime·m0(SB), T0

	// save m->g0 = g0
	MOV	g, m_g0(T0)
	// save m0 to g0->m
	MOV	T0, g_m(g)

	CALL	runtime·check(SB)

	// args are already prepared
	CALL	runtime·args(SB)
	CALL	runtime·osinit(SB)
	CALL	runtime·schedinit(SB)

	ADD	$const_stackGuard, R2
	MOVD	R2, g_stackguard0(g)
	MOVD	R2, g_stackguard1(g)

	// set the per-goroutine and per-mach "registers"
	MOVD	$runtime·m0(SB), R2

	// save m->g0 = g0
	MOVD	g, m_g0(R2)
	// save m0 to g0->m
	MOVD	R2, g_m(g)

	BL	runtime·check(SB)

	// argc/argv are already prepared on stack
	BL	runtime·args(SB)
	BL	runtime·checkS390xCPU(SB)
	BL	runtime·osinit(SB)

	ADDV	$const_stackGuard, R19
	MOVV	R19, g_stackguard0(g)
	MOVV	R19, g_stackguard1(g)

	// set the per-goroutine and per-mach "registers"
	MOVV	$runtime·m0(SB), R19

	// save m->g0 = g0
	MOVV	g, m_g0(R19)
	// save m0 to g0->m
	MOVV	R19, g_m(g)

	JAL	runtime·check(SB)

	// args are already prepared
	JAL	runtime·args(SB)
	JAL	runtime·osinit(SB)
	JAL	runtime·schedinit(SB)

	ADD	$const_stackGuard, R1
	MOVW	R1, g_stackguard0(g)
	MOVW	R1, g_stackguard1(g)

	// set the per-goroutine and per-mach "registers"
	MOVW	$runtime·m0(SB), R1

	// save m->g0 = g0
	MOVW	g, m_g0(R1)
	// save m0 to g0->m
	MOVW	R1, g_m(g)

	JAL	runtime·check(SB)

	// args are already prepared
	JAL	runtime·args(SB)
	JAL	runtime·osinit(SB)
	JAL	runtime·schedinit(SB)

// Switches SP to g0 stack and calls (X14). Arguments already set.
TEXT	asancall<>(SB), NOSPLIT, $0-0
	MOV	X2, X8		// callee-saved
	BEQZ	g, g0stack	// no g, still on a system stack
	MOV	g_m(g), X21
	MOV	m_g0(X21), X21
	BEQ	X21, g, g0stack

	MOV	(g_sched+gobuf_sp)(X21), X2

g0stack:
	JALR	RA, X14
	MOV	X8, X2

// Switches SP to g0 stack and calls (FARG). Arguments already set.
TEXT	msancall<>(SB), NOSPLIT, $0-0
	MOVV	R3, R23         // callee-saved
	BEQ	g, g0stack      // no g, still on a system stack
	MOVV	g_m(g), R14
	MOVV	m_g0(R14), R15
	BEQ	R15, g, g0stack

	MOVV	(g_sched+gobuf_sp)(R15), R9
	MOVV	R9, R3

g0stack:
	JAL	(FARG)
	MOVV	R23, R3