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
28 #define _GNU_SOURCE /* include REG_ defines from ucontext.h */
37 #include "vm/jit/i386/codegen.h"
39 #include "threads/threads-common.h"
41 #include "vm/exceptions.h"
42 #include "vm/signallocal.h"
43 #include "vm/stringlocal.h"
45 #include "vm/jit/asmpart.h"
46 #include "vm/jit/stacktrace.h"
49 /* md_signal_handler_sigsegv ***************************************************
51 Signal handler for hardware exceptions.
53 *******************************************************************************/
55 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
73 _uc = (ucontext_t *) _p;
74 _mc = &_uc->uc_mcontext;
76 pv = NULL; /* is resolved during stackframeinfo creation */
77 sp = (u1 *) _mc->gregs[REG_ESP];
78 xpc = (u1 *) _mc->gregs[REG_EIP];
79 ra = xpc; /* return address is equal to XPC */
81 /* get exception-throwing instruction */
83 opc = M_ALD_MEM_GET_OPC(xpc);
84 mod = M_ALD_MEM_GET_MOD(xpc);
85 rm = M_ALD_MEM_GET_RM(xpc);
87 /* for values see emit_mov_mem_reg and emit_mem */
89 if ((opc == 0x8b) && (mod == 0) && (rm == 5)) {
90 /* this was a hardware-exception */
92 d = M_ALD_MEM_GET_REG(xpc);
93 disp = M_ALD_MEM_GET_DISP(xpc);
95 /* we use the exception type as load displacement */
99 /* ATTENTION: The _mc->gregs layout is completely crazy! The
100 registers are reversed starting with number 4 for REG_EDI
101 (see /usr/include/sys/ucontext.h). We have to convert that
104 val = _mc->gregs[REG_EAX - d];
107 /* this was a normal NPE */
109 type = EXCEPTION_HARDWARE_NULLPOINTER;
113 /* create stackframeinfo */
115 stacktrace_create_extern_stackframeinfo(&sfi, pv, sp, ra, xpc);
117 /* Handle the type. */
119 p = signal_handle(xpc, type, val);
121 /* remove stackframeinfo */
123 stacktrace_remove_stackframeinfo(&sfi);
127 _mc->gregs[REG_EAX] = (intptr_t) p;
128 _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
129 _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
133 /* md_signal_handler_sigfpe ****************************************************
135 ArithmeticException signal handler for hardware divide by zero
138 *******************************************************************************/
140 void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
153 _uc = (ucontext_t *) _p;
154 _mc = &_uc->uc_mcontext;
156 pv = NULL; /* is resolved during stackframeinfo creation */
157 sp = (u1 *) _mc->gregs[REG_ESP];
158 xpc = (u1 *) _mc->gregs[REG_EIP];
159 ra = xpc; /* return address is equal to xpc */
161 /* this is an ArithmeticException */
163 type = EXCEPTION_HARDWARE_ARITHMETIC;
166 /* create stackframeinfo */
168 stacktrace_create_extern_stackframeinfo(&sfi, pv, sp, ra, xpc);
170 /* Handle the type. */
172 p = signal_handle(xpc, type, val);
174 /* remove stackframeinfo */
176 stacktrace_remove_stackframeinfo(&sfi);
178 _mc->gregs[REG_EAX] = (intptr_t) p;
179 _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
180 _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
184 /* md_signal_handler_sigusr2 ***************************************************
186 Signal handler for profiling sampling.
188 *******************************************************************************/
190 #if defined(ENABLE_THREADS)
191 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
200 _uc = (ucontext_t *) _p;
201 _mc = &_uc->uc_mcontext;
203 pc = (u1 *) _mc->gregs[REG_EIP];
210 /* md_critical_section_restart *************************************************
212 Search the critical sections tree for a matching section and set
213 the PC to the restart point, if necessary.
215 *******************************************************************************/
217 #if defined(ENABLE_THREADS)
218 void md_critical_section_restart(ucontext_t *_uc)
224 _mc = &_uc->uc_mcontext;
226 pc = (u1 *) _mc->gregs[REG_EIP];
228 npc = critical_find_restart_point(pc);
231 _mc->gregs[REG_EIP] = (ptrint) npc;
237 * These are local overrides for various environment variables in Emacs.
238 * Please do not remove this and leave it at the end of the file, where
239 * Emacs will automagically detect them.
240 * ---------------------------------------------------------------------
243 * indent-tabs-mode: t