#endif
#ifdef TLS_linux
#define MRS_TPIDR_R0 WORD $0xd53bd040 // MRS TPIDR_EL0, R0
#endif

#ifdef GOOS_darwin
#define TLS_darwin
#endif
#ifdef GOOS_ios
#define TLS_darwin
#endif
#ifdef TLS_darwin
#define TLSG_IS_VARIABLE
#define MRS_TPIDR_R0 WORD $0xd53bd060 // MRS TPIDRRO_EL0, R0
#endif

#ifdef GOOS_freebsd
#define MRS_TPIDR_R0 WORD $0xd53bd040 // MRS TPIDR_EL0, R0
#endif

#ifdef GOOS_netbsd

	MRS	DBGBCR2_EL1, R22                   // b60230d5
	MRS	DBGBCR3_EL1, R8                    // a80330d5
	MRS	DBGBCR4_EL1, R2                    // a20430d5
	MRS	DBGBCR5_EL1, R4                    // a40530d5
	MRS	DBGBCR6_EL1, R2                    // a20630d5
	MRS	DBGBCR7_EL1, R6                    // a60730d5
	MRS	DBGBCR8_EL1, R1                    // a10830d5
	MRS	DBGBCR9_EL1, R16                   // b00930d5

// func getisar0() uint64
TEXT ·getisar0(SB),NOSPLIT,$0-8
	// get Instruction Set Attributes 0 into x0
	// mrs x0, ID_AA64ISAR0_EL1 = d5380600
	WORD	$0xd5380600
	MOVD	R0, ret+0(FP)
	RET

// func getisar1() uint64
TEXT ·getisar1(SB),NOSPLIT,$0-8
	// get Instruction Set Attributes 1 into x0
	// mrs x0, ID_AA64ISAR1_EL1 = d5380620
	WORD	$0xd5380620
	MOVD	R0, ret+0(FP)
	RET

// func getpfr0() uint64

	MRS	ICC_EOIR1_EL1, R5                                // ERROR "system register is not readable"
	MRS	ICC_EOIR0_EL1, R5                                // ERROR "system register is not readable"
	MRS	ICC_DIR_EL1, R5                                  // ERROR "system register is not readable"
	MRS	ICC_ASGI1R_EL1, R5                               // ERROR "system register is not readable"

#include "textflag.h"

// func getisar0() uint64
TEXT ·getisar0(SB),NOSPLIT,$0
	// get Instruction Set Attributes 0 into R0
	MRS	ID_AA64ISAR0_EL1, R0
	MOVD	R0, ret+0(FP)
	RET

// func getMIDR() uint64
TEXT ·getMIDR(SB), NOSPLIT, $0-8
	MRS	MIDR_EL1, R0
	MOVD	R0, ret+0(FP)

	"MOVH",
	"MOVHU",
	"MOVK",
	"MOVKW",
	"MOVN",
	"MOVNW",
	"MOVP",
	"MOVPD",
	"MOVPQ",
	"MOVPS",
	"MOVPSW",
	"MOVPW",
	"MOVW",
	"MOVWU",
	"MOVZ",
	"MOVZW",
	"MRS",
	"MSR",
	"MSUB",
	"MSUBW",
	"MUL",
	"MULW",
	"MVN",
	"MVNW",
	"NEG",
	"NEGS",
	"NEGSW",
	"NEGW",
	"NGC",
	"NGCS",
	"NGCSW",
	"NGCW",
	"NOOP",
	"ORN",

	// DCZID_EL0 bit assignments
	// [63:5] Reserved
	// [4]    DZP, if bit set DC ZVA instruction is prohibited, else permitted
	// [3:0]  log2 of the block size in words, eg. if it returns 0x4 then block size is 16 words
	MRS	DCZID_EL0, R3
	TBZ	$4, R3, init
	// ZVA not available
	MOVW	$~0, R5
	MOVW	R5, block_size<>(SB)
	B	no_zva

init:
	MOVW	$4, R9
	ANDW	$15, R3, R5
	LSLW	R5, R9, R5
	MOVW	R5, block_size<>(SB)

TEXT runtime·getCntxct(SB),NOSPLIT,$0
	MOVB	physical+0(FP), R0
	CMP	$0, R0
	BEQ	3(PC)

	// get CNTPCT (Physical Count Register) into R0
	MRS	CNTPCT_EL0, R0
	B	2(PC)

	// get CNTVCT (Virtual Count Register) into R0
	MRS	CNTVCT_EL0, R0

	MOVW	R0, ret+8(FP)
	RET

// func issetugid() int32
TEXT runtime·issetugid(SB),NOSPLIT|NOFRAME,$0
	MOVD $SYS_issetugid, R8
	SVC

	MRS_EQ:            "MRS.EQ",
	MRS_NE:            "MRS.NE",
	MRS_CS:            "MRS.CS",
	MRS_CC:            "MRS.CC",
	MRS_MI:            "MRS.MI",
	MRS_PL:            "MRS.PL",
	MRS_VS:            "MRS.VS",
	MRS_VC:            "MRS.VC",
	MRS_HI:            "MRS.HI",
	MRS_LS:            "MRS.LS",
	MRS_GE:            "MRS.GE",
	MRS_LT:            "MRS.LT",
	MRS_GT:            "MRS.GT",

	MSR $1, SPSel                              // bf4100d5
	MSR $9, DAIFSet                            // df4903d5
	MSR $6, DAIFClr                            // ff4603d5
	MRS ELR_EL1, R8                            // 284038d5
	MSR R16, ELR_EL1                           // 304018d5
	MRS DCZID_EL0, R3                          // e3003bd5
	MSUBW R1, R1, R12, R5                      // 8585011b
	MSUB R19, R16, R26, R2                     // 42c3139b