xref: /src/sys/arch/riscv/include/asm.h

/*	$NetBSD: asm.h,v 1.9 2025/01/04 21:02:01 skrll Exp $	*/

/*-
 * Copyright (c) 2014 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas of 3am Software Foundry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RISCV_ASM_H
#define	_RISCV_ASM_H

#define	_C_LABEL(x)	x

#define	__CONCAT(x,y)	x ## y
#define	__STRING(x)	#x

#define	___CONCAT(x,y)	__CONCAT(x,y)

/*
 * Define -pg profile entry code.
 * Must always be noreorder, must never use a macro instruction
 * Final addiu to t9 must always equal the size of this _KERN_MCOUNT
 */
#define	_KERN_MCOUNT						\
	.set	push;						\
	subi	sp, sp, CALLFRAME_SIZE;				\
	REG_S	a0, CALLFRAME_S0(sp);				\
	REG_S	ra, CALLFRAME_RA(sp);				\
	move	a0, ra;						\
	call	_mcount 					\
	REG_L	ra, CALLFRAME_RA(sp);				\
	REG_L	a0, CALLFRAME_S0(sp);				\
	addi	sp, sp, CALLFRAME_SIZ;				\
	.set	pop;

#ifdef GPROF
#define	_PROF_PROLOGUE _KERN_MCOUNT
#else
#define	_PROF_PROLOGUE
#endif

#ifdef __PIC__
#define	PLT(x)	x##@plt
#else
#define PLT(x)	x
#endif

/*
 * WEAK_ALIAS: create a weak alias.
 */
#define	WEAK_ALIAS(alias,sym)						\
	.weak alias;							\
	alias = sym
/*
 * STRONG_ALIAS: create a strong alias.
 */
#define	STRONG_ALIAS(alias,sym)						\
	.globl alias;							\
	alias = sym

/*
 * WARN_REFERENCES: create a warning if the specified symbol is referenced.
 */
#define	WARN_REFERENCES(sym,msg)					\
	.pushsection __CONCAT(.gnu.warning.,sym);			\
	.ascii msg;							\
	.popsection

#define	_ENTRY(x)			\
	.globl	_C_LABEL(x);		\
	.type	_C_LABEL(x), @function;	\
	_C_LABEL(x):

#define	ENTRY_NP(x)	.text; .align 2; _ENTRY(x)
#define	ENTRY(x)	ENTRY_NP(x); _PROF_PROLOGUE
#define	ALTENTRY(x)	_ENTRY(x)
#define	END(x)		.size _C_LABEL(x), . - _C_LABEL(x)

/*
 * Macros to panic and printf from assembly language.
 */
#define	PANIC(msg)			\
	la	a0, 9f;			\
	call	_C_LABEL(panic);	\
	MSG(msg)

#define	PRINTF(msg)			\
	la	a0, 9f;			\
	call	_C_LABEL(printf);	\
	MSG(msg)

#define	MSG(msg)			\
	.pushsection .rodata.str1.8,"aMS",@progbits,1; \
9:	.asciiz	msg;			\
	.popsection

#define	ASMSTR(str)			\
	.asciiz str;			\
	.align	3

#ifdef _NETBSD_REVISIONID
#define __RCSID(x)	.pushsection ".ident","MS",@progbits,1;		\
			.asciz "$" "NetBSD: " __FILE__			\
			    " " _NETBSD_REVISIONID " $";		\
			.asciz x;					\
			.popsection
#else
#define __RCSID(x)	.pushsection ".ident","MS",@progbits,1;		\
			.asciz x;					\
			.popsection
#endif
#define RCSID(name)	__RCSID(name)

#if defined(_LP64)
#define	SZREG	8
#else
#define	SZREG	4
#endif

#define	ALSK	15		/* stack alignment */
#define	ALMASK	-15		/* stack alignment */
#define	SZFPREG	8
#define	FP_L	fld
#define	FP_S	fsd

/*
 *  standard callframe {
 *  	register_t cf_sp;		frame pointer
 *  	register_t cf_ra;		return address
 *  };
 */
#define	CALLFRAME_SIZ	(SZREG * 4)
#define	CALLFRAME_S1	(CALLFRAME_SIZ - 4 * SZREG)
#define	CALLFRAME_S0	(CALLFRAME_SIZ - 3 * SZREG)
#define	CALLFRAME_SP	(CALLFRAME_SIZ - 2 * SZREG)
#define	CALLFRAME_RA	(CALLFRAME_SIZ - 1 * SZREG)

/*
 * These macros hide the use of rv32 and rv64 instructions from the
 * assembler to prevent the assembler from generating 64-bit style
 * ABI calls.
 */
#define	PTR_ADD		add
#define	PTR_ADDI	addi
#define	PTR_SUB		sub
#define	PTR_SUBI	subi
#define	PTR_LA		la
#define	PTR_SLLI	slli
#define	PTR_SLL		sll
#define	PTR_SRLI	srli
#define	PTR_SRL		srl
#define	PTR_SRAI	srai
#define	PTR_SRA		sra
#if _LP64
#define	PTR_L		ld
#define	PTR_S		sd
#define	PTR_LR		lr.d
#define	PTR_SC		sc.d
#define	PTR_WORD	.dword
#define	PTR_SCALESHIFT	3
#else
#define	PTR_L		lw
#define	PTR_S		sw
#define	PTR_LR		lr.w
#define	PTR_SC		sc.w
#define	PTR_WORD	.word
#define	PTR_SCALESHIFT	2
#endif

#define	INT_L		lw
#define	INT_LA		la
#define	INT_S		sw
#define	INT_LR		lr.w
#define	INT_SC		sc.w
#define	INT_WORD	.word
#define	INT_SCALESHIFT	2
#ifdef _LP64
#define	INT_ADD		addw
#define	INT_ADDI	addwi
#define	INT_SUB		subw
#define	INT_SUBI	subwi
#define	INT_SLL		sllwi
#define	INT_SLLV	sllw
#define	INT_SRL		srlwi
#define	INT_SRLV	srlw
#define	INT_SRA		srawi
#define	INT_SRAV	sraw
#else
#define	INT_ADD		add
#define	INT_ADDI	addi
#define	INT_SUB		sub
#define	INT_SUBI	subi
#define	INT_SLLI	slli
#define	INT_SLL		sll
#define	INT_SRLI	srli
#define	INT_SRL		srl
#define	INT_SRAI	srai
#define	INT_SRA		sra
#endif

#define	LONG_LA		la
#define	LONG_ADD	add
#define	LONG_ADDI	addi
#define	LONG_SUB	sub
#define	LONG_SUBI	subi
#define	LONG_SLLI	slli
#define	LONG_SLL	sll
#define	LONG_SRLI	srli
#define	LONG_SRL	srl
#define	LONG_SRAI	srai
#define	LONG_SRA	sra
#ifdef _LP64
#define	LONG_L		ld
#define	LONG_S		sd
#define	LONG_LR		lr.d
#define	LONG_SC		sc.d
#define	LONG_WORD	.quad
#define	LONG_SCALESHIFT	3
#else
#define	LONG_L		lw
#define	LONG_S		sw
#define	LONG_LR		lr.w
#define	LONG_SC		sc.w
#define	LONG_WORD	.word
#define	LONG_SCALESHIFT	2
#endif

#define	REG_LI		li
#define	REG_ADD		add
#define	REG_SLLI	slli
#define	REG_SLL		sll
#define	REG_SRLI	srli
#define	REG_SRL		srl
#define	REG_SRAI	srai
#define	REG_SRA		sra
#if _LP64
#define	REG_L		ld
#define	REG_S		sd
#define	REG_LR		lr.d
#define	REG_SC		sc.d
#define	REG_SCALESHIFT	3
#else
#define	REG_L		lw
#define	REG_S		sw
#define	REG_LR		lr.w
#define	REG_SC		sc.w
#define	REG_SCALESHIFT	2
#endif

#define	CPUVAR(off) _C_LABEL(cpu_info_store)+__CONCAT(CPU_INFO_,off)

#endif /* _RISCV_ASM_H */