/*      $OpenBSD: SYS.h,v 1.26 2023/12/10 16:45:51 deraadt Exp $*/
/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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: @(#)SYS.h 5.5 (Berkeley) 5/7/91
 */

#include <sys/syscall.h>
#include "DEFS.h"


#define __CONCAT(p,x)           p##x
#define __ENTRY(p,x)            ENTRY(__CONCAT(p,x))
#define __END(p,x)              END(__CONCAT(p,x)); \
                                _HIDDEN_ALIAS(x,__CONCAT(p,x)); \
                                END(_HIDDEN(x))
#define __SYSCALLNAME(p,x)      __CONCAT(p,x)
#define __ALIAS(prefix,name)    WEAK_ALIAS(name,__CONCAT(prefix,name))

#ifdef __PIC__
#define PIC_SAVE(reg)           or reg, %r25, %r0
#define PIC_RESTORE(reg)        or %r25, reg, %r0
#define PIC_SETUP                                                       \
        or      %r11, %r0,  %r1;                                        \
        or.u    %r25, %r0,  %hi16(.Lpic#abdiff);                        \
        bsr.n   .Lpic;                                                  \
         or     %r25, %r25, %lo16(.Lpic#abdiff);                        \
.Lpic:  add     %r25, %r25, %r1;                                        \
        or      %r1,  %r0,  %r11
#if __PIC__ > 1
#define PIC_LOAD(reg,sym)                                               \
        or.u    %r11, %r0,  %hi16(__CONCAT(sym,#got_rel));              \
        or      %r11, %r11, %lo16(__CONCAT(sym,#got_rel));              \
        ld      reg,  %r25, %r11
#define PIC_STORE(reg,sym)                                              \
        or.u    %r11, %r0,  %hi16(__CONCAT(sym,#got_rel));              \
        or      %r11, %r11, %lo16(__CONCAT(sym,#got_rel));              \
        st      reg,  %r25, %r11
#else           /* -fpic */
#define PIC_LOAD(reg,sym)                                               \
        ld      %r11, %r25, __CONCAT(sym,#got_rel);                     \
        ld      reg,  %r11, %r0
#define PIC_STORE(reg,sym)                                              \
        ld      %r11, %r25, __CONCAT(sym,#got_rel);                     \
        st      reg,  %r11, %r0
#endif
#define CERROR  __cerror#plt
#else   /* __PIC__ */
#define CERROR  __cerror
#endif  /* __PIC__ */

#define __DO_SYSCALL(x)                                                 \
        or %r13, %r0, __SYSCALLNAME(SYS_,x);                            \
97:     tb0 0, %r0, 450;                                                \
        PINSYSCALL(__SYSCALLNAME(SYS_,x), 97b)

#define __SYSCALL__NOERROR(p,x,y)                                       \
        __ENTRY(p,x);                                                   \
        __ALIAS(p,x);                                                   \
        __DO_SYSCALL(y)
#define __SYSCALL_HIDDEN__NOERROR(p,x,y)                                \
        __ENTRY(p,x);                                                   \
        __DO_SYSCALL(y)

#define __SYSCALL(p,x,y)                                                \
        __SYSCALL__NOERROR(p,x,y);                                      \
        br CERROR
#define __SYSCALL_HIDDEN(p,x,y)                                         \
        __SYSCALL_HIDDEN__NOERROR(p,x,y);                               \
        br CERROR

#define __PSEUDO_NOERROR(p,x,y)                                         \
        __SYSCALL__NOERROR(p,x,y);                                      \
        or %r0, %r0, %r0;                                               \
        jmp %r1;                                                        \
        __END(p,x); END(x)

#define __PSEUDO(p,x,y)                                                 \
        __SYSCALL(p,x,y);                                               \
        jmp %r1;                                                        \
        __END(p,x); END(x)
#define __PSEUDO_HIDDEN(p,x,y)                                          \
        __SYSCALL_HIDDEN(p,x,y);                                        \
        jmp %r1;                                                        \
        __END(p,x)

/*
 * System calls entry points are really named _thread_sys_{syscall},
 * and weakly aliased to the name {syscall}. This allows the thread
 * library to replace system calls at link time.
 */
#define SYSCALL(x)              __SYSCALL(_thread_sys_,x,x)
#define RSYSCALL(x)             __PSEUDO(_thread_sys_,x,x)
#define RSYSCALL_HIDDEN(x)      __PSEUDO_HIDDEN(_thread_sys_,x,x)
#define PSEUDO(x,y)             __PSEUDO(_thread_sys_,x,y)
#define PSEUDO_NOERROR(x,y)     __PSEUDO_NOERROR(_thread_sys_,x,y)
#define SYSENTRY_HIDDEN(x)      __ENTRY(_thread_sys_,x)
#define SYSENTRY(x)             SYSENTRY_HIDDEN(x);             \
                                __ALIAS(_thread_sys_,x)
#define SYSCALL_END_HIDDEN(x)   __END(_thread_sys_,x)
#define SYSCALL_END(x)          SYSCALL_END_HIDDEN(x); END(x)

#define ASMSTR          .asciz