/*      $OpenBSD: SYS.h,v 1.27 2023/12/13 09:01:25 miod Exp $   */

/*
 * Copyright (c) 1998-2002 Michael Shalayeff
 * All rights reserved.
 *
 * 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 AUTHOR ``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 AUTHOR 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 MIND
 * 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.
 */

#include <sys/syscall.h>
#include "DEFS.h"
#undef _LOCORE
#define _LOCORE
#include <machine/frame.h>
#include <machine/vmparam.h>
#undef _LOCORE

/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
#define TCB_OFFSET_ERRNO        -8

/*
 * For functions implemented in ASM that aren't syscalls.
 *   EXIT_STRONG(x)     Like DEF_STRONG() in C; for standard/reserved C names
 *   EXIT_WEAK(x)       Like DEF_WEAK() in C; for non-ISO C names
 */
#define EXIT_STRONG(x)  EXIT(x)                 !\
        _HIDDEN_FALIAS(x,x)                     !\
        _END(_HIDDEN(x))
#define EXIT_WEAK(x)    EXIT_STRONG(x)          !\
        .weak x
 
#define SYSENTRY(x)                             !\
        LEAF_ENTRY(__CONCAT(_thread_sys_,x))    !\
        WEAK_ALIAS(x,__CONCAT(_thread_sys_,x))
#define SYSENTRY_HIDDEN(x)                      !\
        LEAF_ENTRY(__CONCAT(_thread_sys_,x))
#define SYSEXIT(x)                              !\
        SYSEXIT_HIDDEN(x)                       !\
        _END(x)
#define SYSEXIT_HIDDEN(x)                       !\
        EXIT(__CONCAT(_thread_sys_,x))          !\
        _HIDDEN_FALIAS(x,_thread_sys_##x)       !\
        _END(_HIDDEN(x))

#define SYSCALL(x)                              !\
        stw     rp, HPPA_FRAME_ERP(sr0,sp)      !\
        ldil    L%SYSCALLGATE, r1               !\
97:     ble     4(sr7, r1)                      !\
        PINSYSCALL(__CONCAT(SYS_,x), 97b)       !\
         ldi    __CONCAT(SYS_,x), t1            !\
        comb,=  0, t1, 1f                       !\
        ldw     HPPA_FRAME_ERP(sr0,sp), rp      !\
        /* set errno */                         \
        mfctl   cr27, r1                        !\
        stw     t1, TCB_OFFSET_ERRNO(r1)        !\
        ldi     -1, ret0                        !\
        bv      r0(rp)                          !\
         ldi    -1, ret1        /* for lseek */ !\
1:

#define PSEUDO(x,y)                             !\
SYSENTRY(x)                                     !\
        SYSCALL(y)                              !\
        bv      r0(rp)                          !\
        nop                                     !\
SYSEXIT(x)
#define PSEUDO_HIDDEN(x,y)                      !\
SYSENTRY_HIDDEN(x)                              !\
        SYSCALL(y)                              !\
        bv      r0(rp)                          !\
        nop                                     !\
SYSEXIT_HIDDEN(x)

#define PSEUDO_NOERROR(x,y)                     !\
SYSENTRY(x)                                     !\
        stw     rp, HPPA_FRAME_ERP(sr0,sp)      !\
        ldil    L%SYSCALLGATE, r1               !\
97:     ble     4(sr7, r1)                      !\
        PINSYSCALL(__CONCAT(SYS_,y), 97b)       !\
         ldi    __CONCAT(SYS_,y), t1            !\
        ldw     HPPA_FRAME_ERP(sr0,sp), rp      !\
        bv      r0(rp)                          !\
        nop                                     !\
SYSEXIT(x)

#define RSYSCALL(x)             PSEUDO(x,x)
#define RSYSCALL_HIDDEN(x)      PSEUDO_HIDDEN(x,x)