/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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.
 *
 *      @(#)SYS.h       8.1 (Berkeley) 6/4/93
 *
 *      from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp
 *      $NetBSD: SYS.h,v 1.19 2013/09/12 15:36:16 joerg Exp $
 */

#include <machine/asm.h>
#include <sys/syscall.h>
#include <machine/trap.h>

#ifdef __STDC__
#define _CAT(x,y) x##y
#else
#define _CAT(x,y) x/**/y
#endif

#ifdef __ELF__
#define CERROR          _C_LABEL(__cerror)
#define CURBRK          _C_LABEL(__curbrk)
#else
#define CERROR          _ASM_LABEL(cerror)
#define CURBRK          _ASM_LABEL(curbrk)
#endif

/*
 * ERROR branches to cerror.
 */
#ifdef __PIC__
#define CALL(name)                              \
        PIC_PROLOGUE(%g1, %g5);                 \
        set     name, %g5;                      \
        ld      [%g1 + %g5], %g5;               \
        jmp     %g5;                            \
         nop
#else
#define CALL(name)                              \
        set     name, %g1;                      \
        jmp     %g1;                            \
         nop
#endif
#define ERROR() CALL(CERROR)

/*
 * SYSCALL is used when further action must be taken before returning.
 * Note that it adds a `nop' over what we could do, if we only knew
 * what came at label 1....
 */
#define _SYSCALL(x,y)                           \
ENTRY(x);                                       \
        mov     _CAT(SYS_,y), %g1;              \
        t       ST_SYSCALL;                     \
        bcc     1f;                             \
         nop;                                   \
        ERROR();                                \
1:      /* next insn */

#define SYSCALL(x)                              \
        _SYSCALL(x,x)

/*
 * RSYSCALL is used when the system call should just return.  Here we
 * use the SYSCALL_G5RFLAG to put the `success' return address in %g5
 * and avoid a branch.
 *
 * PSEUDO(x,y) is like RSYSCALL(y), except that the name is x.
 */
#define _RSYSCALL(x,y)                                  \
ENTRY(x);                                               \
        mov     (_CAT(SYS_,y)) | SYSCALL_G5RFLAG, %g1;  \
        add     %o7, 8, %g5;                            \
        t       ST_SYSCALL;                             \
        ERROR()

#define RSYSCALL(x)     _RSYSCALL(x,x)
#define PSEUDO(x,y)     _RSYSCALL(x,y)

/*
 * WSYSCALL(weak,strong) is like RSYSCALL(weak),
 * except that weak is a weak internal alias for the strong symbol.
 */
#ifdef WEAK_ALIAS
#define WSYSCALL(weak,strong)                   \
        WEAK_ALIAS(weak,strong);                \
        PSEUDO(strong,weak)
#else
#define WSYSCALL(weak,strong)                   \
        RSYSCALL(weak)
#endif

/*
 * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls that
 * never fail.
 *
 * XXX - This should be optimized.
 */
#define SYSCALL_NOERROR(x)                      \
ENTRY(x);                                       \
        mov     _CAT(SYS_,x), %g1;              \
        t       ST_SYSCALL

/*
 * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
 * that never fail.
 *
 * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y), except that the
 * name is x.
 *
 * XXX - This should be optimized.
 */
#define _RSYSCALL_NOERROR(x,y)                          \
ENTRY(x);                                               \
        mov     (_CAT(SYS_,y)) | SYSCALL_G5RFLAG, %g1;  \
        add     %o7, 8, %g5;                            \
        t       ST_SYSCALL

#define RSYSCALL_NOERROR(x)     _RSYSCALL_NOERROR(x,x)
#define PSEUDO_NOERROR(x,y)     _RSYSCALL_NOERROR(x,y)

        .globl  CERROR