1 /* src/vm/jit/alpha/linux/md-os.c - machine dependent Alpha Linux functions
3 Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
4 C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5 E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6 J. Wenninger, 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., 51 Franklin Street, Fifth Floor, Boston, MA
25 $Id: md-os.c 8188 2007-07-06 00:31:03Z michi $
37 #include "vm/jit/alpha/codegen.h"
38 #include "vm/jit/alpha/md-abi.h"
40 #if defined(ENABLE_THREADS)
41 # include "threads/native/threads.h"
44 #include "vm/exceptions.h"
45 #include "vm/signallocal.h"
47 #include "vm/jit/asmpart.h"
48 #include "vm/jit/stacktrace.h"
51 /* md_signal_handler_sigsegv ***************************************************
53 NullPointerException signal handler for hardware null pointer
56 *******************************************************************************/
58 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
76 _uc = (ucontext_t *) _p;
77 _mc = &_uc->uc_mcontext;
79 pv = (u1 *) _mc->sc_regs[REG_PV];
80 sp = (u1 *) _mc->sc_regs[REG_SP];
81 ra = (u1 *) _mc->sc_regs[REG_RA]; /* this is correct for leafs */
82 xpc = (u1 *) _mc->sc_pc;
84 /* get exception-throwing instruction */
86 mcode = *((u4 *) xpc);
88 d = M_MEM_GET_A(mcode);
89 s1 = M_MEM_GET_B(mcode);
90 disp = M_MEM_GET_DISP(mcode);
92 val = _mc->sc_regs[d];
94 /* check for special-load */
97 /* we use the exception type as load displacement */
102 /* This is a normal NPE: addr must be NULL and the NPE-type
105 addr = _mc->sc_regs[s1];
109 /* generate appropriate exception */
111 e = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val, &sfi);
116 _mc->sc_regs[REG_ITMP1_XPTR] = (ptrint) e;
117 _mc->sc_regs[REG_ITMP2_XPC] = (ptrint) xpc;
118 _mc->sc_pc = (ptrint) asm_handle_exception;
123 /* md_signal_handler_sigusr1 ***************************************************
125 Signal handler for suspending threads.
127 *******************************************************************************/
129 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
130 void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
137 _uc = (ucontext_t *) _p;
138 _mc = &_uc->uc_mcontext;
140 /* get the PC and SP for this thread */
141 pc = (u1 *) _mc->sc_pc;
142 sp = (u1 *) _mc->sc_regs[REG_SP];
144 /* now suspend the current thread */
145 threads_suspend_ack(pc, sp);
150 /* md_signal_handler_sigusr2 ***************************************************
152 Signal handler for profiling sampling.
154 *******************************************************************************/
156 #if defined(ENABLE_THREADS)
157 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
166 _uc = (ucontext_t *) _p;
167 _mc = &_uc->uc_mcontext;
169 pc = (u1 *) _mc->sc_pc;
176 /* md_critical_section_restart *************************************************
178 Search the critical sections tree for a matching section and set
179 the PC to the restart point, if necessary.
181 *******************************************************************************/
183 #if defined(ENABLE_THREADS)
184 void md_critical_section_restart(ucontext_t *_uc)
190 _mc = &_uc->uc_mcontext;
192 pc = (u1 *) _mc->sc_pc;
194 npc = critical_find_restart_point(pc);
197 _mc->sc_pc = (ptrint) npc;
203 * These are local overrides for various environment variables in Emacs.
204 * Please do not remove this and leave it at the end of the file, where
205 * Emacs will automagically detect them.
206 * ---------------------------------------------------------------------
209 * indent-tabs-mode: t