// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: BSD-3-Clause

// Differential kernel for the riscv64 bookkeeping statements and the
// slot-relative branches: FUNCDATA and PCDATA (the expanded forms of the
// funcdata.h macros, contributing no bytes), UNDEF (the toolchain's ebreak),
// and the JMP N(PC) slot jumps including the self-loop and the backward form.

#include "textflag.h"

TEXT ·bookkeep(SB), NOSPLIT, $8-8
	FUNCDATA $1, marks<>(SB)
	PCDATA   $1, $-1
	MOV      ZERO, ret+0(FP)
	PCDATA   $1, $1
	UNDEF
	MOV      $1, X10
	RET

TEXT ·slots(SB), NOSPLIT, $0-0
	MOV $1, X10
	JMP 2(PC)
	MOV $64, X11
	MOV $128, X12
	MOV $2, X11
	MOV $3, X12
	BEQ X10, X11, skip
	JMP -2(PC)

skip:
	JMP 0(PC)

TEXT ·marksreader(SB), NOSPLIT, $0-8
	MOV $marks<>(SB), X10
	MOV (X10), X11
	MOV X11, ret+0(FP)
	RET

GLOBL marks<>(SB), RODATA, $8
DATA marks<>+0(SB)/8, $1234605616436508552