type PtraceRegsAmd64 struct {
	R15      uint64
	R14      uint64
	R13      uint64
	R12      uint64
	Rbp      uint64
	Rbx      uint64
	R11      uint64
	R10      uint64
	R9       uint64
	R8       uint64
	Rax      uint64
	Rcx      uint64
	Rdx      uint64
	Rsi      uint64
	Rdi      uint64
	Orig_rax uint64
	Rip      uint64
	Cs       uint64
	Eflags   uint64
	Rsp      uint64
	Ss       uint64

	FCMPD F2, F3               <=>     fcmp d3, d2
	FCVTDH F2, F3              <=>     fcvt h3, d2

2. Go uses .P and .W suffixes to indicate post-increment and pre-increment.

Examples:

	MOVD.P -8(R10), R8         <=>      ldr x8, [x10],#-8
	MOVB.W 16(R16), R10        <=>      ldrsb x10, [x16,#16]!
	MOVBU.W 16(R16), R10       <=>      ldrb x10, [x16,#16]!

3. Go uses a series of MOV instructions as load and store.

type R0 struct {
	*R1
	*R2
	*R3
	*R4
}

type R1 struct {
	*R5
	*R6
	*R7
	*R8
}

type R2 R1
type R3 R1
type R4 R1

type R5 struct {
	*R9
	*R10
	*R11
	*R12
}

type R6 R5
type R7 R5
type R8 R5

type R9 struct {
	*R13
	*R14
	*R15
	*R16
}

type R10 R9
type R11 R9
type R12 R9

	// amd64:`MOVQ\t\$-2401018187971961171, DX`, `MOVQ\t\$-2401018187971961171, SI`, `MOVQ\t\$-2401018187971961171, DI`
	// amd64:`MOVQ\t\$-2401018187971961171, R8`, `MOVQ\t\$-2401018187971961171, R9`, `MOVQ\t\$-2401018187971961171, R10`
	// amd64:`MOVQ\t\$-2401018187971961171, R11`, `MOVQ\t\$-2401018187971961171, R12`, `MOVQ\t\$-2401018187971961171, R13`

 * 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 */
	call *%rsi	/* setg_gcc */
	call *%rbx	/* fn */
#endif

	popq %r15

			Valu("arg2", OpArg, c.config.Types.Int64, 0, arg2Aux),
			Valu("arg3", OpArg, c.config.Types.Int64, 0, arg3Aux),
			Valu("r9", OpAdd64, c.config.Types.Int64, 0, nil, "r7", "r8"),
			Valu("r4", OpAdd64, c.config.Types.Int64, 0, nil, "r1", "r2"),
			Valu("r8", OpAdd64, c.config.Types.Int64, 0, nil, "arg3", "arg2"),
			Valu("r2", OpAdd64, c.config.Types.Int64, 0, nil, "arg1", "arg2"),

// license that can be found in the LICENSE file.

#include "textflag.h"

// func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
	MOVD	num+0(FP), R8	// syscall entry
	MOVD	a1+8(FP), R0
	MOVD	a2+16(FP), R1
	MOVD	a3+24(FP), R2
	MOVD	a4+32(FP), R3
	MOVD	a5+40(FP), R4
	MOVD	a6+48(FP), R5
	SVC
	CMN	$4095, R0
	BCC	ok
	MOVD	$-1, R4
	MOVD	R4, r1+56(FP)

	ADJSP	$0x18
#ifndef GOOS_windows
	MOVQ	DI, 0x0(SP)	/* fn */
	MOVQ	SI, 0x8(SP)	/* arg */
	// Skip n in DX.
	MOVQ	CX, 0x10(SP)	/* ctxt */
#else
	MOVQ	CX, 0x0(SP)	/* fn */
	MOVQ	DX, 0x8(SP)	/* arg */
	// Skip n in R8.
	MOVQ	R9, 0x10(SP)	/* ctxt */
#endif

	CALL	runtime·cgocallback(SB)

	ADJSP	$-0x18
	POP_REGS_HOST_TO_ABI0()

#include "textflag.h"

// For expandKeyAsm
#define INP     R3
#define BITS    R4
#define OUTENC  R5 // Pointer to next expanded encrypt key
#define PTR     R6
#define CNT     R7
#define ROUNDS  R8
#define OUTDEC  R9  // Pointer to next expanded decrypt key
#define TEMP    R19
#define ZERO    V0
#define IN0     V1
#define IN1     V2
#define KEY     V3
#define RCON    V4
#define MASK    V5

	NO_LOCAL_POINTERS
	CALL	runtime·entersyscall<ABIInternal>(SB)
	MOVQ	num+0(FP), AX	// syscall entry
	MOVQ	a1+8(FP), DI
	MOVQ	a2+16(FP), SI
	MOVQ	a3+24(FP), DX
	MOVQ	a4+32(FP), R10
	MOVQ	a5+40(FP), R8
	MOVQ	a6+48(FP), R9
	MOVQ	a7+56(FP), R11
	MOVQ	a8+64(FP), R12
	MOVQ	a9+72(FP), R13

	// only the first 6 arguments can be passed in registers,
	// the last three should be placed at the top of the stack.