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 2992 2005-07-11 21:52:07Z twisti $
43 #include "vm/jit/alpha/asmoffsets.h"
44 #include "vm/jit/alpha/md-abi.h"
45 #include "vm/jit/alpha/types.h"
47 #include "vm/exceptions.h"
48 #include "vm/stringlocal.h"
49 #include "vm/jit/asmpart.h"
50 #include "vm/jit/stacktrace.h"
53 /* md_init *********************************************************************
55 Do some machine dependent initialization.
57 *******************************************************************************/
62 /* XXX TWISTI: do we really need this? fptest's seem to work fine */
64 #if defined(__LINUX__)
65 /* Linux on Digital Alpha needs an initialisation of the ieee floating point
66 control for IEEE compliant arithmetic (option -mieee of GCC). Under
67 Digital Unix this is done automatically.
72 extern unsigned long ieee_get_fp_control();
73 extern void ieee_set_fp_control(unsigned long fp_control);
75 /* initialize floating point control */
77 ieee_set_fp_control(ieee_get_fp_control()
78 & ~IEEE_TRAP_ENABLE_INV
79 & ~IEEE_TRAP_ENABLE_DZE
80 /* & ~IEEE_TRAP_ENABLE_UNF we dont want underflow */
81 & ~IEEE_TRAP_ENABLE_OVF);
89 /* signal_handler_sigsegv ******************************************************
91 NullPointerException signal handler for hardware null pointer check.
93 *******************************************************************************/
95 void signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
106 _uc = (ucontext_t *) _p;
107 _mc = &_uc->uc_mcontext;
109 instr = *((s4 *) (_mc->sc_pc));
110 addr = _mc->sc_regs[(instr >> 16) & 0x1f];
113 pv = (u1 *) _mc->sc_regs[REG_PV];
114 sp = (u1 *) _mc->sc_regs[REG_SP];
115 ra = (functionptr) _mc->sc_regs[REG_RA]; /* this is correct for leafs*/
116 xpc = (functionptr) _mc->sc_pc;
118 _mc->sc_regs[REG_ITMP1_XPTR] =
119 (ptrint) stacktrace_hardware_nullpointerexception(pv, sp, ra, xpc);
121 _mc->sc_regs[REG_ITMP2_XPC] = (ptrint) xpc;
122 _mc->sc_pc = (ptrint) asm_handle_exception;
125 addr += (long) ((instr << 16) >> 16);
127 throw_cacao_exception_exit(string_java_lang_InternalError,
128 "Segmentation fault: 0x%016lx at 0x%016lx\n",
134 #if defined(USE_THREADS) && defined(NATIVE_THREADS)
135 void thread_restartcriticalsection(ucontext_t *uc)
139 critical = thread_checkcritical((void *) uc->uc_mcontext.sc_pc);
142 uc->uc_mcontext.sc_pc = (ptrint) critical;
147 /* md_stacktrace_get_returnaddress *********************************************
149 Returns the return address of the current stackframe, specified by
150 the passed stack pointer and the stack frame size.
152 *******************************************************************************/
154 functionptr md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
158 /* on Alpha the return address is located on the top of the stackframe */
160 ra = (functionptr) *((u1 **) (sp + framesize - SIZEOF_VOID_P));
166 /* codegen_findmethod **********************************************************
171 237affe8 lda pv,-24(ra)
173 *******************************************************************************/
175 functionptr codegen_findmethod(functionptr pc)
185 /* get offset of first instruction (lda) */
187 mcode = *((u4 *) ra);
189 if ((mcode >> 16) != 0x237a) {
190 log_text("No `lda pv,x(ra)' instruction found on return address!");
194 offset = (s2) (mcode & 0x0000ffff);
197 /* check for second instruction (ldah) */
199 mcode = *((u4 *) (ra + 1 * 4));
201 if ((mcode >> 16) == 0x177b) {
202 offset = (s2) (mcode << 16);
206 return (functionptr) pv;
211 * These are local overrides for various environment variables in Emacs.
212 * Please do not remove this and leave it at the end of the file, where
213 * Emacs will automagically detect them.
214 * ---------------------------------------------------------------------
217 * indent-tabs-mode: t