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 8283 2007-08-09 15:10:05Z twisti $
30 #define _GNU_SOURCE /* include REG_ defines from ucontext.h */
39 #include "vm/jit/i386/codegen.h"
41 #include "threads/threads-common.h"
43 #include "vm/exceptions.h"
44 #include "vm/signallocal.h"
45 #include "vm/stringlocal.h"
47 #include "vm/jit/asmpart.h"
48 #include "vm/jit/stacktrace.h"
51 /* md_signal_handler_sigsegv ***************************************************
53 Signal handler for hardware exceptions.
55 *******************************************************************************/
57 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
75 _uc = (ucontext_t *) _p;
76 _mc = &_uc->uc_mcontext;
78 pv = NULL; /* is resolved during stackframeinfo creation */
79 sp = (u1 *) _mc->gregs[REG_ESP];
80 xpc = (u1 *) _mc->gregs[REG_EIP];
81 ra = xpc; /* return address is equal to XPC */
83 /* get exception-throwing instruction */
85 opc = M_ALD_MEM_GET_OPC(xpc);
86 mod = M_ALD_MEM_GET_MOD(xpc);
87 rm = M_ALD_MEM_GET_RM(xpc);
89 /* for values see emit_mov_mem_reg and emit_mem */
91 if ((opc == 0x8b) && (mod == 0) && (rm == 5)) {
92 /* this was a hardware-exception */
94 d = M_ALD_MEM_GET_REG(xpc);
95 disp = M_ALD_MEM_GET_DISP(xpc);
97 /* we use the exception type as load displacement */
101 /* ATTENTION: The _mc->gregs layout is completely crazy! The
102 registers are reversed starting with number 4 for REG_EDI
103 (see /usr/include/sys/ucontext.h). We have to convert that
106 val = _mc->gregs[REG_EAX - d];
109 /* this was a normal NPE */
111 type = EXCEPTION_HARDWARE_NULLPOINTER;
115 /* create stackframeinfo */
117 stacktrace_create_extern_stackframeinfo(&sfi, pv, sp, ra, xpc);
119 /* Handle the type. */
121 p = signal_handle(xpc, type, val);
123 /* remove stackframeinfo */
125 stacktrace_remove_stackframeinfo(&sfi);
129 _mc->gregs[REG_EAX] = (intptr_t) p;
130 _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
131 _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
135 /* md_signal_handler_sigfpe ****************************************************
137 ArithmeticException signal handler for hardware divide by zero
140 *******************************************************************************/
142 void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
155 _uc = (ucontext_t *) _p;
156 _mc = &_uc->uc_mcontext;
158 pv = NULL; /* is resolved during stackframeinfo creation */
159 sp = (u1 *) _mc->gregs[REG_ESP];
160 xpc = (u1 *) _mc->gregs[REG_EIP];
161 ra = xpc; /* return address is equal to xpc */
163 /* this is an ArithmeticException */
165 type = EXCEPTION_HARDWARE_ARITHMETIC;
168 /* create stackframeinfo */
170 stacktrace_create_extern_stackframeinfo(&sfi, pv, sp, ra, xpc);
172 /* Handle the type. */
174 p = signal_handle(xpc, type, val);
176 /* remove stackframeinfo */
178 stacktrace_remove_stackframeinfo(&sfi);
180 _mc->gregs[REG_EAX] = (intptr_t) p;
181 _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
182 _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
186 /* md_signal_handler_sigusr2 ***************************************************
188 Signal handler for profiling sampling.
190 *******************************************************************************/
192 #if defined(ENABLE_THREADS)
193 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
202 _uc = (ucontext_t *) _p;
203 _mc = &_uc->uc_mcontext;
205 pc = (u1 *) _mc->gregs[REG_EIP];
212 /* md_critical_section_restart *************************************************
214 Search the critical sections tree for a matching section and set
215 the PC to the restart point, if necessary.
217 *******************************************************************************/
219 #if defined(ENABLE_THREADS)
220 void md_critical_section_restart(ucontext_t *_uc)
226 _mc = &_uc->uc_mcontext;
228 pc = (u1 *) _mc->gregs[REG_EIP];
230 npc = critical_find_restart_point(pc);
233 _mc->gregs[REG_EIP] = (ptrint) npc;
239 * These are local overrides for various environment variables in Emacs.
240 * Please do not remove this and leave it at the end of the file, where
241 * Emacs will automagically detect them.
242 * ---------------------------------------------------------------------
245 * indent-tabs-mode: t