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/* $OpenBSD: asm.h,v 1.3 2022/02/23 07:16:26 jsg Exp $ */
/*
* Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: @(#)asm.h 5.5 (Berkeley) 5/7/91
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#define _C_LABEL(x) x
#define _ASM_LABEL(x) x
#ifdef __STDC__
# define __CONCAT(x,y) x ## y
# define __STRING(x) #x
#else
# define __CONCAT(x,y) x/**/y
# define __STRING(x) "x"
#endif
#ifndef _ALIGN_TEXT
# define _ALIGN_TEXT .align 0
#endif
#if defined(PROF) || defined(GPROF)
// XXX Profiler Support
#define _PROF_PROLOGUE \
addi sp, sp, -16; \
sd ra, 8(sp); \
sd fp, 0(sp); \
mv fp, sp; \
call __mcount; \
ld ra, 8(sp); \
ld fp, 0(sp); \
add sp, sp, 16;
#else
#define _PROF_PROLOGUE
#endif
#if defined(_RET_PROTECTOR)
// XXX Retguard Support
#error RETGUARD not yet supported for riscv64
#else
#define RETGUARD_CALC_COOKIE(reg)
#define RETGUARD_LOAD_RANDOM(x, reg)
#define RETGUARD_SETUP(x, reg)
#define RETGUARD_CHECK(x, reg)
#define RETGUARD_PUSH(reg)
#define RETGUARD_POP(reg)
#define RETGUARD_SYMBOL(x)
#endif
#define _ENTRY(x) \
.text; .globl x; .type x,@function; .p2align 1; x:
#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
#define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
#define END(y) .size y, . - y
#define EENTRY(sym) .globl sym; sym:
#define EEND(sym)
#ifdef __PIC__
#ifdef __STDC__
#define PIC_SYM(x,y) x ## ( ## y ## )
#else
#define PIC_SYM(x,y) x/**/(/**/y/**/)
#endif
#else
#define PIC_SYM(x,y) x
#endif
#define STRONG_ALIAS(alias,sym) \
.global alias; \
alias = sym
#define WEAK_ALIAS(alias,sym) \
.weak alias; \
alias = sym
#ifdef __STDC__
#define WARN_REFERENCES(sym,msg) \
.stabs msg ## ,30,0,0,0 ; \
.stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
#else
#define WARN_REFERENCES(sym,msg) \
.stabs msg,30,0,0,0 ; \
.stabs __STRING(sym),1,0,0,0
#endif
#define WEAK_REFERENCE(sym, alias) \
.weak alias; \
.set alias,sym
#define SWAP_FAULT_HANDLER(handler, tmp0, tmp1) \
ld tmp0, CI_CURPCB(tp); /* Load the pcb */ \
ld tmp1, PCB_ONFAULT(tmp0); /* Save old handler */ \
sd handler, PCB_ONFAULT(tmp0); /* Set the handler */ \
mv handler, tmp1
#define SET_FAULT_HANDLER(handler, pcb) \
ld pcb, CI_CURPCB(tp); /* Load the pcb */ \
sd handler, PCB_ONFAULT(pcb) /* Set the handler */
#define ENTER_USER_ACCESS(tmp) \
li tmp, SSTATUS_SUM; \
csrs sstatus, tmp
#define EXIT_USER_ACCESS(tmp) \
li tmp, SSTATUS_SUM; \
csrc sstatus, tmp
#endif /* _MACHINE_ASM_H_ */
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