1 /* src/vm/jit/alpha/md.c - machine dependent Alpha functions
3 Copyright (C) 1996-2005 R. Grafl, A. Krall, C. Kruegel, C. Oates,
4 R. Obermaisser, M. Platter, M. Probst, S. Ring, E. Steiner,
5 C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich, J. Wenninger,
6 Institut f. Computersprachen - TU Wien
8 This file is part of CACAO.
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2, or (at
13 your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25 Contact: cacao@complang.tuwien.ac.at
27 Authors: Andreas Krall
30 Changes: Joseph Wenninger
33 $Id: md.c 2831 2005-06-26 11:39:18Z twisti $
41 #include "vm/jit/alpha/md-abi.h"
42 #include "vm/jit/alpha/types.h"
44 #include "vm/exceptions.h"
45 #include "vm/stringlocal.h"
46 #include "vm/jit/asmpart.h"
49 /* md_init *********************************************************************
51 Do some machine dependent initialization.
53 *******************************************************************************/
58 /* XXX TWISTI: do we really need this? fptest's seem to work fine */
60 #if defined(__LINUX__)
61 /* Linux on Digital Alpha needs an initialisation of the ieee floating point
62 control for IEEE compliant arithmetic (option -mieee of GCC). Under
63 Digital Unix this is done automatically.
68 extern unsigned long ieee_get_fp_control();
69 extern void ieee_set_fp_control(unsigned long fp_control);
71 /* initialize floating point control */
73 ieee_set_fp_control(ieee_get_fp_control()
74 & ~IEEE_TRAP_ENABLE_INV
75 & ~IEEE_TRAP_ENABLE_DZE
76 /* & ~IEEE_TRAP_ENABLE_UNF we dont want underflow */
77 & ~IEEE_TRAP_ENABLE_OVF);
85 /* signal_handler_sigsegv ******************************************************
87 NullPointerException signal handler for hardware null pointer check.
89 *******************************************************************************/
91 void signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
98 _uc = (ucontext_t *) _p;
99 _mc = &_uc->uc_mcontext;
101 instr = *((s4 *) (_mc->sc_pc));
102 addr = _mc->sc_regs[(instr >> 16) & 0x1f];
105 _mc->sc_regs[REG_ITMP1_XPTR] =
106 (ptrint) string_java_lang_NullPointerException;
108 _mc->sc_regs[REG_ITMP2_XPC] = _mc->sc_pc;
109 _mc->sc_pc = (ptrint) asm_throw_and_handle_exception;
112 addr += (long) ((instr << 16) >> 16);
114 throw_cacao_exception_exit(string_java_lang_InternalError,
115 "faulting address: 0x%016lx\n", addr);
120 #if defined(USE_THREADS) && defined(NATIVE_THREADS)
121 void thread_restartcriticalsection(ucontext_t *uc)
125 critical = thread_checkcritical((void *) uc->uc_mcontext.sc_pc);
128 uc->uc_mcontext.sc_pc = (ptrint) critical;
134 * These are local overrides for various environment variables in Emacs.
135 * Please do not remove this and leave it at the end of the file, where
136 * Emacs will automagically detect them.
137 * ---------------------------------------------------------------------
140 * indent-tabs-mode: t