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 7571 2007-03-24 22:37:09Z twisti $
30 #define _GNU_SOURCE /* include REG_ defines from ucontext.h */
38 #include "vm/exceptions.h"
39 #include "vm/signallocal.h"
40 #include "vm/stringlocal.h"
42 #include "vm/jit/asmpart.h"
43 #include "vm/jit/stacktrace.h"
45 #include "vm/jit/i386/codegen.h"
48 /* md_signal_handler_sigsegv ***************************************************
50 Signal handler for hardware exceptions.
52 *******************************************************************************/
54 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
71 _uc = (ucontext_t *) _p;
72 _mc = &_uc->uc_mcontext;
74 pv = NULL; /* is resolved during stackframeinfo creation */
75 sp = (u1 *) _mc->gregs[REG_ESP];
76 xpc = (u1 *) _mc->gregs[REG_EIP];
77 ra = xpc; /* return address is equal to XPC */
79 /* get exception-throwing instruction */
81 opc = M_ALD_MEM_GET_OPC(xpc);
82 mod = M_ALD_MEM_GET_MOD(xpc);
83 rm = M_ALD_MEM_GET_RM(xpc);
85 /* for values see emit_mov_mem_reg and emit_mem */
87 if ((opc == 0x8b) && (mod == 0) && (rm == 5)) {
88 /* this was a hardware-exception */
90 d = M_ALD_MEM_GET_REG(xpc);
91 disp = M_ALD_MEM_GET_DISP(xpc);
93 /* we use the exception type as load displacement */
97 /* ATTENTION: The _mc->gregs layout is completely crazy! The
98 registers are reversed starting with number 4 for REG_EDI
99 (see /usr/include/sys/ucontext.h). We have to convert that
102 val = _mc->gregs[REG_EAX - d];
105 /* this was a normal NPE */
107 type = EXCEPTION_HARDWARE_NULLPOINTER;
110 /* generate appropriate exception */
112 e = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val);
116 _mc->gregs[REG_EAX] = (ptrint) e;
117 _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
118 _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
122 /* md_signal_handler_sigfpe ****************************************************
124 ArithmeticException signal handler for hardware divide by zero
127 *******************************************************************************/
129 void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
137 _uc = (ucontext_t *) _p;
138 _mc = &_uc->uc_mcontext;
140 sp = (u1 *) _mc->gregs[REG_ESP];
141 xpc = (u1 *) _mc->gregs[REG_EIP];
142 ra = xpc; /* return address is equal to xpc */
144 _mc->gregs[REG_EAX] =
145 (ptrint) stacktrace_hardware_arithmeticexception(NULL, sp, ra, xpc);
147 _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
148 _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
152 /* md_signal_handler_sigusr2 ***************************************************
154 Signal handler for profiling sampling.
156 *******************************************************************************/
158 #if defined(ENABLE_THREADS)
159 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
168 _uc = (ucontext_t *) _p;
169 _mc = &_uc->uc_mcontext;
171 pc = (u1 *) _mc->gregs[REG_EIP];
178 #if defined(ENABLE_THREADS)
179 void thread_restartcriticalsection(ucontext_t *uc)
183 critical = critical_find_restart_point((void *) uc->uc_mcontext.gregs[REG_EIP]);
186 uc->uc_mcontext.gregs[REG_EIP] = (ptrint) critical;
192 * These are local overrides for various environment variables in Emacs.
193 * Please do not remove this and leave it at the end of the file, where
194 * Emacs will automagically detect them.
195 * ---------------------------------------------------------------------
198 * indent-tabs-mode: t