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];
106 if (type == EXCEPTION_HARDWARE_COMPILER) {
107 /* We use a framesize of zero here because the call pushed
108 the return addres onto the stack. */
110 ra = md_stacktrace_get_returnaddress(sp, 0);
112 /* And remove the RA from the stack. */
114 sp = sp + 1 * SIZEOF_VOID_P;
118 /* this was a normal NPE */
120 type = EXCEPTION_HARDWARE_NULLPOINTER;
124 /* Handle the type. */
126 p = signal_handle(type, val, pv, sp, ra, xpc, _p);
130 if (type == EXCEPTION_HARDWARE_COMPILER) {
132 o = exceptions_get_and_clear_exception();
134 ra = ra - 2; /* XPC is before the actual call */
136 _mc->gregs[REG_ESP] = (uintptr_t) sp; /* Remove RA from stack. */
138 _mc->gregs[REG_EAX] = (uintptr_t) o;
139 _mc->gregs[REG_ECX] = (uintptr_t) ra; /* REG_ITMP2_XPC */
140 _mc->gregs[REG_EIP] = (uintptr_t) asm_handle_exception;
143 _mc->gregs[REG_EIP] = (uintptr_t) p;
147 _mc->gregs[REG_EAX] = (intptr_t) p;
148 _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
149 _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
154 /* md_signal_handler_sigfpe ****************************************************
156 ArithmeticException signal handler for hardware divide by zero
159 *******************************************************************************/
161 void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
173 _uc = (ucontext_t *) _p;
174 _mc = &_uc->uc_mcontext;
176 pv = NULL; /* is resolved during stackframeinfo creation */
177 sp = (u1 *) _mc->gregs[REG_ESP];
178 xpc = (u1 *) _mc->gregs[REG_EIP];
179 ra = xpc; /* return address is equal to xpc */
181 /* this is an ArithmeticException */
183 type = EXCEPTION_HARDWARE_ARITHMETIC;
186 /* Handle the type. */
188 p = signal_handle(type, val, pv, sp, ra, xpc, _p);
192 _mc->gregs[REG_EAX] = (intptr_t) p;
193 _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
194 _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
198 /* md_signal_handler_sigill ****************************************************
200 Signal handler for hardware patcher traps (ud2).
202 *******************************************************************************/
204 void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
216 _uc = (ucontext_t *) _p;
217 _mc = &_uc->uc_mcontext;
219 pv = NULL; /* is resolved during stackframeinfo creation */
220 sp = (u1 *) _mc->gregs[REG_ESP];
221 xpc = (u1 *) _mc->gregs[REG_EIP];
222 ra = xpc; /* return address is equal to xpc */
224 /* this is an ArithmeticException */
226 type = EXCEPTION_HARDWARE_PATCHER;
229 /* generate appropriate exception */
231 p = signal_handle(type, val, pv, sp, ra, xpc, _p);
233 /* set registers (only if exception object ready) */
236 _mc->gregs[REG_EAX] = (ptrint) p;
237 _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
238 _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
243 /* md_signal_handler_sigusr1 ***************************************************
245 Signal handler for suspending threads.
247 *******************************************************************************/
249 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
250 void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
257 _uc = (ucontext_t *) _p;
258 _mc = &_uc->uc_mcontext;
260 /* get the PC and SP for this thread */
261 pc = (u1 *) _mc->gregs[REG_EIP];
262 sp = (u1 *) _mc->gregs[REG_ESP];
264 /* now suspend the current thread */
265 threads_suspend_ack(pc, sp);
270 /* md_signal_handler_sigusr2 ***************************************************
272 Signal handler for profiling sampling.
274 *******************************************************************************/
276 #if defined(ENABLE_THREADS)
277 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
286 _uc = (ucontext_t *) _p;
287 _mc = &_uc->uc_mcontext;
289 pc = (u1 *) _mc->gregs[REG_EIP];
296 /* md_critical_section_restart *************************************************
298 Search the critical sections tree for a matching section and set
299 the PC to the restart point, if necessary.
301 *******************************************************************************/
303 #if defined(ENABLE_THREADS)
304 void md_critical_section_restart(ucontext_t *_uc)
310 _mc = &_uc->uc_mcontext;
312 pc = (u1 *) _mc->gregs[REG_EIP];
314 npc = critical_find_restart_point(pc);
317 _mc->gregs[REG_EIP] = (ptrint) npc;
323 * These are local overrides for various environment variables in Emacs.
324 * Please do not remove this and leave it at the end of the file, where
325 * Emacs will automagically detect them.
326 * ---------------------------------------------------------------------
329 * indent-tabs-mode: t