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 3285 2005-09-27 14:12:36Z twisti $
44 #include "vm/jit/alpha/md-abi.h"
46 #include "vm/exceptions.h"
47 #include "vm/stringlocal.h"
48 #include "vm/jit/asmpart.h"
49 #include "vm/jit/stacktrace.h"
52 /* md_init *********************************************************************
54 Do some machine dependent initialization.
56 *******************************************************************************/
61 /* XXX TWISTI: do we really need this? fptest's seem to work fine */
63 #if defined(__LINUX__)
64 /* Linux on Digital Alpha needs an initialisation of the ieee floating point
65 control for IEEE compliant arithmetic (option -mieee of GCC). Under
66 Digital Unix this is done automatically.
71 extern unsigned long ieee_get_fp_control();
72 extern void ieee_set_fp_control(unsigned long fp_control);
74 /* initialize floating point control */
76 ieee_set_fp_control(ieee_get_fp_control()
77 & ~IEEE_TRAP_ENABLE_INV
78 & ~IEEE_TRAP_ENABLE_DZE
79 /* & ~IEEE_TRAP_ENABLE_UNF we dont want underflow */
80 & ~IEEE_TRAP_ENABLE_OVF);
88 /* signal_handler_sigsegv ******************************************************
90 NullPointerException signal handler for hardware null pointer check.
92 *******************************************************************************/
94 void signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
105 _uc = (ucontext_t *) _p;
106 _mc = &_uc->uc_mcontext;
108 instr = *((s4 *) (_mc->sc_pc));
109 addr = _mc->sc_regs[(instr >> 16) & 0x1f];
112 pv = (u1 *) _mc->sc_regs[REG_PV];
113 sp = (u1 *) _mc->sc_regs[REG_SP];
114 ra = (functionptr) _mc->sc_regs[REG_RA]; /* this is correct for leafs*/
115 xpc = (functionptr) _mc->sc_pc;
117 _mc->sc_regs[REG_ITMP1_XPTR] =
118 (ptrint) stacktrace_hardware_nullpointerexception(pv, sp, ra, xpc);
120 _mc->sc_regs[REG_ITMP2_XPC] = (ptrint) xpc;
121 _mc->sc_pc = (ptrint) asm_handle_exception;
124 addr += (long) ((instr << 16) >> 16);
126 throw_cacao_exception_exit(string_java_lang_InternalError,
127 "Segmentation fault: 0x%016lx at 0x%016lx\n",
133 #if defined(USE_THREADS) && defined(NATIVE_THREADS)
134 void thread_restartcriticalsection(ucontext_t *uc)
138 critical = thread_checkcritical((void *) uc->uc_mcontext.sc_pc);
141 uc->uc_mcontext.sc_pc = (ptrint) critical;
146 /* md_stacktrace_get_returnaddress *********************************************
148 Returns the return address of the current stackframe, specified by
149 the passed stack pointer and the stack frame size.
151 *******************************************************************************/
153 functionptr md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
157 /* on Alpha the return address is located on the top of the stackframe */
159 ra = (functionptr) *((u1 **) (sp + framesize - SIZEOF_VOID_P));
165 /* codegen_findmethod **********************************************************
170 277afffe ldah pv,-2(ra)
171 237ba61c lda pv,-23012(pv)
173 *******************************************************************************/
175 functionptr codegen_findmethod(functionptr pc)
185 /* get first instruction word after jump */
187 mcode = *((u4 *) ra);
189 /* check if we have 2 instructions (ldah, lda) */
191 if ((mcode >> 16) == 0x277a) {
192 /* get displacement of first instruction (ldah) */
194 offset = (s4) (mcode << 16);
197 /* get displacement of second instruction (lda) */
199 mcode = *((u4 *) (ra + 1 * 4));
201 if ((mcode >> 16) != 0x237b) {
202 log_text("No `lda pv,x(pv)' instruction found on return address!");
206 offset = (s2) (mcode & 0x0000ffff);
210 /* get displacement of first instruction (lda) */
212 if ((mcode >> 16) != 0x237a) {
213 log_text("No `lda pv,x(ra)' instruction found on return address!");
217 offset = (s2) (mcode & 0x0000ffff);
221 return (functionptr) pv;
226 * These are local overrides for various environment variables in Emacs.
227 * Please do not remove this and leave it at the end of the file, where
228 * Emacs will automagically detect them.
229 * ---------------------------------------------------------------------
232 * indent-tabs-mode: t