1 /* src/vm/jit/arm/linux/md-os.c - machine dependent arm 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.c 166 2006-01-22 23:38:44Z twisti $
36 #include "vm/jit/arm/md-abi.h"
38 #define ucontext broken_glibc_ucontext
39 #define ucontext_t broken_glibc_ucontext_t
44 typedef struct ucontext {
45 unsigned long uc_flags;
46 struct ucontext *uc_link;
48 struct sigcontext uc_mcontext;
52 #define scontext_t struct sigcontext
54 #if defined(ENABLE_THREADS)
55 # include "threads/native/threads.h"
58 #include "vm/exceptions.h"
59 #include "vm/signallocal.h"
60 #include "vm/stringlocal.h"
62 #include "vm/jit/asmpart.h"
63 #include "vm/jit/stacktrace.h"
66 /* md_signal_handler_sigsegv ***************************************************
68 Signal handler for hardware exceptions.
70 *******************************************************************************/
72 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
87 _uc = (ucontext_t*) _p;
88 _sc = &_uc->uc_mcontext;
90 /* ATTENTION: glibc included messed up kernel headers we needed a
91 workaround for the ucontext structure. */
93 pv = (u1 *) _sc->arm_ip;
94 sp = (u1 *) _sc->arm_sp;
95 ra = (u1 *) _sc->arm_lr; /* this is correct for leafs */
96 xpc = (u1 *) _sc->arm_pc;
98 /* get exception-throwing instruction */
101 vm_abort("md_signal_handler_sigsegv: the program counter is NULL");
103 mcode = *((s4 *) xpc);
105 /* this is a NullPointerException */
107 addr = *((s4 *) _sc + OFFSET(scontext_t, arm_r0)/4 + ((mcode >> 16) & 0x0f));
108 type = EXCEPTION_HARDWARE_NULLPOINTER;
112 vm_abort("md_signal_handler_sigsegv: faulting address is not NULL: addr=%p", addr);
114 /* generate appropriate exception */
116 o = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val, &sfi);
120 _sc->arm_r10 = (ptrint) o;
121 _sc->arm_fp = (ptrint) xpc;
122 _sc->arm_pc = (ptrint) asm_handle_exception;
126 /* md_signal_handler_sigill ****************************************************
128 Illegal Instruction signal handler for hardware exception checks.
130 *******************************************************************************/
132 void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
144 java_objectheader *o;
146 _uc = (ucontext_t*) _p;
147 _sc = &_uc->uc_mcontext;
149 /* ATTENTION: glibc included messed up kernel headers we needed a
150 workaround for the ucontext structure. */
152 pv = (u1 *) _sc->arm_ip;
153 sp = (u1 *) _sc->arm_sp;
154 ra = (u1 *) _sc->arm_lr; /* this is correct for leafs */
155 xpc = (u1 *) _sc->arm_pc;
157 /* get exception-throwing instruction */
159 mcode = *((u4 *) xpc);
161 /* check for undefined instruction we use */
163 if ((mcode & 0x0ff000f0) != 0x07f000f0)
164 vm_abort("md_signal_handler_sigill: unknown illegal instruction");
166 type = (mcode >> 8) & 0x0fff;
167 val = *((s4 *) _sc + OFFSET(scontext_t, arm_r0)/4 + (mcode & 0x0f));
169 /* generate appropriate exception */
171 o = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val, &sfi);
173 /* set registers if we have an exception, return continue execution
174 otherwise (this is needed for patchers to work) */
177 _sc->arm_r10 = (ptrint) o;
178 _sc->arm_fp = (ptrint) xpc;
179 _sc->arm_pc = (ptrint) 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)
193 threadobject *thread;
198 thread = THREADOBJECT;
200 _uc = (ucontext_t*) _p;
201 _sc = &_uc->uc_mcontext;
203 pc = (u1 *) _sc->arm_pc;
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 _sc = &_uc->uc_mcontext;
226 pc = (u1 *) _sc->arm_pc;
228 npc = critical_find_restart_point(pc);
231 _sc->arm_pc = (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