1 /* src/vm/jit/i386/linux/md-os.c - machine dependent i386 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 7918 2007-05-20 20:42:18Z michi $
30 #define _GNU_SOURCE /* include REG_ defines from ucontext.h */
38 #if defined(ENABLE_GC_CACAO)
39 # include "mm/cacao-gc/gc.h"
42 #include "vm/jit/i386/codegen.h"
44 #include "threads/threads-common.h"
46 #include "vm/exceptions.h"
47 #include "vm/signallocal.h"
48 #include "vm/stringlocal.h"
50 #include "vm/jit/asmpart.h"
51 #include "vm/jit/stacktrace.h"
54 /* md_signal_handler_sigsegv ***************************************************
56 Signal handler for hardware exceptions.
58 *******************************************************************************/
60 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
77 _uc = (ucontext_t *) _p;
78 _mc = &_uc->uc_mcontext;
80 pv = NULL; /* is resolved during stackframeinfo creation */
81 sp = (u1 *) _mc->gregs[REG_ESP];
82 xpc = (u1 *) _mc->gregs[REG_EIP];
83 ra = xpc; /* return address is equal to XPC */
85 /* get exception-throwing instruction */
87 opc = M_ALD_MEM_GET_OPC(xpc);
88 mod = M_ALD_MEM_GET_MOD(xpc);
89 rm = M_ALD_MEM_GET_RM(xpc);
91 /* for values see emit_mov_mem_reg and emit_mem */
93 if ((opc == 0x8b) && (mod == 0) && (rm == 5)) {
94 /* this was a hardware-exception */
96 d = M_ALD_MEM_GET_REG(xpc);
97 disp = M_ALD_MEM_GET_DISP(xpc);
99 /* we use the exception type as load displacement */
103 /* ATTENTION: The _mc->gregs layout is completely crazy! The
104 registers are reversed starting with number 4 for REG_EDI
105 (see /usr/include/sys/ucontext.h). We have to convert that
108 val = _mc->gregs[REG_EAX - d];
111 /* this was a normal NPE */
113 type = EXCEPTION_HARDWARE_NULLPOINTER;
116 /* generate appropriate exception */
118 o = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val);
122 _mc->gregs[REG_EAX] = (ptrint) o;
123 _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
124 _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
128 /* md_signal_handler_sigfpe ****************************************************
130 ArithmeticException signal handler for hardware divide by zero
133 *******************************************************************************/
135 void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
145 java_objectheader *o;
147 _uc = (ucontext_t *) _p;
148 _mc = &_uc->uc_mcontext;
150 pv = NULL; /* is resolved during stackframeinfo creation */
151 sp = (u1 *) _mc->gregs[REG_ESP];
152 xpc = (u1 *) _mc->gregs[REG_EIP];
153 ra = xpc; /* return address is equal to xpc */
155 /* this is an ArithmeticException */
157 type = EXCEPTION_HARDWARE_ARITHMETIC;
160 /* generate appropriate exception */
162 o = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val);
164 _mc->gregs[REG_EAX] = (ptrint) o;
165 _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
166 _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
170 /* md_signal_handler_sigusr1 ***************************************************
172 Signal handler for suspending threads.
174 *******************************************************************************/
176 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
177 void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
184 _uc = (ucontext_t *) _p;
185 _mc = &_uc->uc_mcontext;
187 /* assume there is a GC pending */
190 /* get the PC and SP for this thread */
191 pc = (u1 *) _mc->gregs[REG_EIP];
192 sp = (u1 *) _mc->gregs[REG_ESP];
194 /* now suspend the current thread */
195 threads_suspend_ack(pc, sp);
200 /* md_signal_handler_sigusr2 ***************************************************
202 Signal handler for profiling sampling.
204 *******************************************************************************/
206 #if defined(ENABLE_THREADS)
207 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
216 _uc = (ucontext_t *) _p;
217 _mc = &_uc->uc_mcontext;
219 pc = (u1 *) _mc->gregs[REG_EIP];
226 /* md_critical_section_restart *************************************************
228 Search the critical sections tree for a matching section and set
229 the PC to the restart point, if necessary.
231 *******************************************************************************/
233 #if defined(ENABLE_THREADS)
234 void md_critical_section_restart(ucontext_t *_uc)
240 _mc = &_uc->uc_mcontext;
242 pc = (u1 *) _mc->gregs[REG_EIP];
244 npc = critical_find_restart_point(pc);
247 log_println("md_critical_section_restart: pc=%p, npc=%p", pc, npc);
248 _mc->gregs[REG_EIP] = (ptrint) npc;
255 * These are local overrides for various environment variables in Emacs.
256 * Please do not remove this and leave it at the end of the file, where
257 * Emacs will automagically detect them.
258 * ---------------------------------------------------------------------
261 * indent-tabs-mode: t