* The standard x86-64 ABI passes the three arguments m, g, fn
 * in %rdi, %rsi, %rdx.
 */
.globl EXT(crosscall1)
EXT(crosscall1):
	pushq %rbx
	pushq %rbp
	pushq %r12
	pushq %r13
	pushq %r14
	pushq %r15

#if defined(_WIN64)
	movq %r8, %rdi	/* arg of setg_gcc */
	call *%rdx	/* setg_gcc */
	call *%rcx	/* fn */
#else
	movq %rdi, %rbx
	movq %rdx, %rdi	/* arg of setg_gcc */

		return
	}

	// This implementation expects the following function prologue layout:
	// - Stack split code (optional)
	// - PUSHQ	BP
	// - MOVQ	SP,	BP
	//
	// If the prologue layout change, the unwind information should be updated
	// accordingly.

	// Search for the PUSHQ BP instruction inside the prologue.
	var pushbp *obj.Prog
	for p := s.Func().Text; p != nil; p = p.Link {

// Code generated by mkpreempt.go; DO NOT EDIT.

#include "go_asm.h"
#include "asm_amd64.h"
#include "textflag.h"

TEXT ·asyncPreempt(SB),NOSPLIT|NOFRAME,$0-0
	PUSHQ BP
	MOVQ SP, BP
	// Save flags before clobbering them
	PUSHFQ
	// obj doesn't understand ADD/SUB on SP, but does understand ADJSP
	ADJSP $368
	// But vet doesn't know ADJSP, so suppress vet stack checking
	NOP SP
	MOVQ AX, 0(SP)
	MOVQ CX, 8(SP)
	MOVQ DX, 16(SP)

	MOVQ	g(R12), R14
	MOVQ	g_m(R14), R13
	MOVQ	m_g0(R13), R15
	CMPQ	R13, R15
	JEQ	noswitch	// branch if already on g0
	MOVQ	R15, g(R12)	// g = m->g0
	MOVQ	R15, R14	// set g register
	PUSHQ	RARG1	// func arg
	PUSHQ	RARG0	// func arg
	CALL	runtime·racecallback(SB)
	POPQ	R12
	POPQ	R12
	// All registers are smashed after Go code, reload.
	get_tls(R12)
	MOVQ	g(R12), R13
	MOVQ	g_m(R13), R13

	MOVQ    $end_of_function<>(SB), BX
	PUSHQ   BX
	// Load the starting address of the return sled into BX.
	MOVQ    $ret_sled<>(SB), BX
	// Load the address of the i'th return instruction from the return sled.
	// The index is given in the fakePC argument.
	ADDQ    R8, BX
	PUSHQ   BX
	// Call the original function with the fakePC return address on the stack.

	MOVQ	a1+8(FP), DI
	MOVQ	a2+16(FP), SI
	MOVQ	a3+24(FP), DX
	MOVQ	$0, R10
	MOVQ	$0, R8
	MOVQ	$0, R9
	MOVQ	trap+0(FP), AX	// syscall entry
	POPQ	R12 // preserve return address
	SYSCALL
	PUSHQ	R12
	CMPQ	AX, $0xfffffffffffff001
	JLS	ok2
	MOVQ	$-1, r1+32(FP)
	NEGQ	AX
	MOVQ	AX, err+40(FP)
	RET
ok2:
	MOVQ	AX, r1+32(FP)
	MOVQ	$0, err+40(FP)
	RET

	CMPL runtime·writeBarrier(SB), $0
	XORQ R15, R15
	RET
TEXT ·a5(SB), 0, $0-0
	CMPL runtime·writeBarrier(SB), $0
	XORL R15, R15
	RET
TEXT ·a6(SB), 0, $0-0
	CMPL runtime·writeBarrier(SB), $0
	POPQ R15
	PUSHQ R15
	RET
TEXT ·a7(SB), 0, $0-0
	CMPL runtime·writeBarrier(SB), $0
	MOVQ R15, AX // ERROR "when dynamic linking, R15 is clobbered by a global variable access and is used here"
	RET
TEXT ·a8(SB), 0, $0-0

	}

	op := inst.Op.String()
	if plan9Suffix[inst.Op] {
		s := inst.DataSize
		if inst.MemBytes != 0 {
			s = inst.MemBytes * 8
		} else if inst.Args[1] == nil { // look for register-only 64-bit instruction, like PUSHQ AX
			if r, ok := inst.Args[0].(Reg); ok && RAX <= r && r <= R15 {
				s = 64
			}
		}
		switch s {
		case 8:
			op += "B"
		case 16:
			op += "W"
		case 32:
			op += "L"
		case 64:
			op += "Q"

// section 3.2.3.
//
// Called by runtime·asmcgocall or runtime·cgocall.
// NOT USING GO CALLING CONVENTION.
TEXT runtime·asmsysvicall6(SB),NOSPLIT,$0
	// asmcgocall will put first argument into DI.
	PUSHQ	DI			// save for later
	MOVQ	libcall_fn(DI), AX
	MOVQ	libcall_args(DI), R11
	MOVQ	libcall_n(DI), R10

	get_tls(CX)
	MOVQ	g(CX), BX
	CMPQ	BX, $0
	JEQ	skiperrno1
	MOVQ	g_m(BX), BX

	log.Fatalf("unexpected relocation variant")
	return -1
}

func elfsetupplt(ctxt *ld.Link, ldr *loader.Loader, plt, got *loader.SymbolBuilder, dynamic loader.Sym) {
	if plt.Size() == 0 {
		// pushq got+8(IP)
		plt.AddUint8(0xff)

		plt.AddUint8(0x35)
		plt.AddPCRelPlus(ctxt.Arch, got.Sym(), 8)

		// jmpq got+16(IP)
		plt.AddUint8(0xff)

		plt.AddUint8(0x25)