/*      $NetBSD: asm.h,v 1.11 2025/01/06 10:46:43 martin 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 x;                                       \
                       .ascii "$"; .ascii "NetBSD: "; .ascii __FILE__; \
                       .ascii " "; .ascii _NETBSD_REVISIONID;          \
                       .asciz " $";                                    \
                       .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 */

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