// r1  | AX          | AX
// r2  | BX          | DX
// err | CX          | part of AX
//
// Note that this differs from "standard" ABI convention, which would pass 4th
// arg in CX, not R10.
TEXT ·Syscall6<ABIInternal>(SB),NOSPLIT,$0
	// a6 already in R9.
	// a5 already in R8.
	MOVQ	SI, R10 // a4
	MOVQ	DI, DX  // a3
	MOVQ	CX, SI  // a2
	MOVQ	BX, DI  // a1
	// num already in AX.
	SYSCALL
	CMPQ	AX, $0xfffffffffffff001
	JLS	ok

// Use of this source code is governed by a BSD-style
// 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

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

#include "textflag.h"

#define PosInf 0x7FF0000000000000

// The rounding mode of RISC-V is different from Go spec.

#define ROUNDFN(NAME, MODE) 	\
TEXT NAME(SB),NOSPLIT,$0; 	\
	MOVD	x+0(FP), F0; 	\
	/* whether x is NaN */; \
	FEQD	F0, F0, X6;	\
	BNEZ	X6, 3(PC);	\
	/* return NaN if x is NaN */; \
	MOVD	F0, ret+8(FP); 	\
	RET;			\
	MOV	$PosInf, X6;	\
	FMVDX	X6, F1;		\

#define INVOKE_SYSCALL	INT	$0x80

// func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
//
// Syscall # in AX, args in BX CX DX SI DI BP, return in AX
TEXT ·Syscall6(SB),NOSPLIT,$0-40
	MOVL	num+0(FP), AX	// syscall entry
	MOVL	a1+4(FP), BX
	MOVL	a2+8(FP), CX
	MOVL	a3+12(FP), DX
	MOVL	a4+16(FP), SI
	MOVL	a5+20(FP), DI
	MOVL	a6+24(FP), BP
	INVOKE_SYSCALL
	CMPL	AX, $0xfffff001

// a4  | R8          | R7
// a5  | R9          | R8
// a6  | R10         | R9
//
// r1  | R4          | R4
// r2  | R5          | R5
// err | R6          | part of R4
TEXT ·Syscall6<ABIInternal>(SB),NOSPLIT,$0-80
	MOVV	R4, R11  // syscall entry
	MOVV	R5, R4
	MOVV	R6, R5
	MOVV	R7, R6
	MOVV	R8, R7
	MOVV	R9, R8
	MOVV	R10, R9
	SYSCALL
	MOVV	R0, R5      // r2 is not used. Always set to 0.
	MOVW	$-4096, R12

	sp := getcallersp()
	pc := getcallerpc()
	doasanwrite(addr, uintptr(len), sp, pc)
}

// Private interface for the runtime.
const asanenabled = true

// asan{read,write} are nosplit because they may be called between
// fork and exec, when the stack must not grow. See issue #50391.

//go:linkname asanread
//go:nosplit
func asanread(addr unsafe.Pointer, sz uintptr) {
	sp := getcallersp()

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

//go:build linux && (mips64 || mips64le)

#include "textflag.h"

// func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
	MOVV	num+0(FP), R2	// syscall entry
	MOVV	a1+8(FP), R4
	MOVV	a2+16(FP), R5
	MOVV	a3+24(FP), R6
	MOVV	a4+32(FP), R7
	MOVV	a5+40(FP), R8
	MOVV	a6+48(FP), R9

	}

	if (b.end-b.next)%unsafe.Sizeof(b.buf[0]) != 0 {
		throw("bad write barrier buffer bounds")
	}
}

// discard resets b's next pointer, but not its end pointer.
//
// This must be nosplit because it's called by wbBufFlush.
//
//go:nosplit
func (b *wbBuf) discard() {
	b.next = uintptr(unsafe.Pointer(&b.buf[0]))
}

// empty reports whether b contains no pointers.
func (b *wbBuf) empty() bool {

// avoids loading R0-R4 twice and uses LDP and STP.
//
// See https://golang.org/issues/43145 for the main compiler issue.
//
// func carryPropagate(v *Element)
TEXT ·carryPropagate(SB),NOFRAME|NOSPLIT,$0-8
	MOVD v+0(FP), R20

	LDP 0(R20), (R0, R1)
	LDP 16(R20), (R2, R3)
	MOVD 32(R20), R4

	AND $0x7ffffffffffff, R0, R10
	AND $0x7ffffffffffff, R1, R11
	AND $0x7ffffffffffff, R2, R12

//       doc: https://www.ibm.com/support/knowledgecenter/en/SSLTBW_3.1.0/com.ibm.zos.v3r1.bpxb100/bpx2cr_List_of_offsets.htm
//
// func bpxcall(plist []unsafe.Pointer, bpx_offset int64)

TEXT ·bpxcall(SB), NOSPLIT|NOFRAME, $0
	MOVD  plist_base+0(FP), R1  // r1 points to plist
	MOVD  bpx_offset+24(FP), R2 // r2 offset to BPX vector table
	MOVD  R14, R7               // save r14
	MOVD  R15, R8               // save r15
	MOVWZ 16(R0), R9