md-trap.hpp

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/* src/vm/jit/x86_64/md-trap.hpp - x86_64 hardware traps

   Copyright (C) 1996-2013
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   This file is part of CACAO.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/


#ifndef MD_TRAP_HPP_
#define MD_TRAP_HPP_ 1

#include "config.h"


/**
 * Trap number defines.
 *
 * On this architecture (x86_64) the trap numbers are used as load
 * displacements and thus must not be 4- or 8-byte aligned.
 *
 * NOTE: In trap_init() we have a check whether the offset of
 * java_arrayheader.data[0] is greater than the largest displacement
 * defined below.  Otherwise normal array loads/stores could trigger
 * an exception.
 */

#define TRAP_INSTRUCTION_IS_LOAD    1

enum {
    TRAP_NullPointerException           = 0,
    TRAP_ArithmeticException            = 1,
    TRAP_ArrayIndexOutOfBoundsException = 2,
    TRAP_ArrayStoreException            = 3,

    /* Don't use 4 (could be a normal load offset). */

    TRAP_ClassCastException             = 5,
    TRAP_CHECK_EXCEPTION                = 6,
    TRAP_PATCHER                        = 7,

    /* Don't use 8 (could be a normal load offset). */

    TRAP_COMPILER                       = 9,
    TRAP_COUNTDOWN                      = 10,
    TRAP_AbstractMethodError            = 11,

    /* Don't use 12 (could be a normal load offset). */

    TRAP_THROW                          = 13,
    TRAP_NAT_EXCEPTION                  = 14,
    TRAP_END
};


/**
 * Macro to fixup a compiler stub.
 * PV : The PV from the compiler stub is equal to the XPC.
 * RA : We use a framesize of zero here because the call pushed
 *      the return addres onto the stack.
 * SP : Skip the RA on the stack.
 * XPC: The XPC is the RA minus 1, because the RA points to the
 *      instruction after the call.
 */
#define MD_TRAP_COMPILER_FIXUP(xpc, ra, sp, pv) \
    do { \
        (pv)  = (xpc); \
        (ra)  = md_stacktrace_get_returnaddress((sp), 0); \
        (sp)  = (void*) (((uintptr_t) (sp)) + 1 * SIZEOF_VOID_P); \
        (xpc) = (void*) (((uintptr_t) (ra)) - 3); \
    } while(0)


/**
 * Align traps so they don't cross cache line boundaries.
 */
 
#define ALIGN_PATCHER_TRAP

void emit_patcher_alignment(codegendata *cd);

#endif // MD_TRAP_HPP_


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
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