1 /* src/vm/jit/trap.c - hardware traps
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
30 /* Include machine dependent trap stuff. */
34 #include "mm/memory.h"
36 #include "native/llni.h"
38 #include "toolbox/logging.h"
40 #include "vm/exceptions.hpp"
41 #include "vm/options.h"
45 #include "vm/jit/code.hpp"
46 #include "vm/jit/disass.h"
47 #include "vm/jit/jit.hpp"
48 #include "vm/jit/methodtree.h"
49 #include "vm/jit/patcher-common.hpp"
50 #include "vm/jit/replace.hpp"
51 #include "vm/jit/stacktrace.hpp"
55 * Mmap the first memory page to support hardware exceptions and check
56 * the maximum hardware trap displacement on the architectures where
57 * it is required (TRAP_INSTRUCTION_IS_LOAD defined to 1).
61 #if !(defined(__ARM__) && defined(__LINUX__))
62 /* On arm-linux the first memory page can't be mmap'ed, as it
63 contains the exception vectors. */
67 /* mmap a memory page at address 0x0, so our hardware-exceptions
70 pagesize = os_getpagesize();
72 (void) os_mmap_anonymous(NULL, pagesize, PROT_NONE, MAP_PRIVATE | MAP_FIXED);
75 TRACESUBSYSTEMINITIALIZATION("trap_init");
77 #if !defined(TRAP_INSTRUCTION_IS_LOAD)
78 # error TRAP_INSTRUCTION_IS_LOAD is not defined in your md-trap.h
81 #if TRAP_INSTRUCTION_IS_LOAD == 1
82 /* Check if we get into trouble with our hardware-exceptions. */
84 if (TRAP_END > OFFSET(java_bytearray_t, data))
85 vm_abort("trap_init: maximum hardware trap displacement is greater than the array-data offset: %d > %d", TRAP_END, OFFSET(java_bytearray_t, data));
91 * Handles the signal which is generated by trap instructions, caught
92 * by a signal handler and calls the correct function.
94 * @param type trap number
97 void* trap_handle(int type, intptr_t val, void *pv, void *sp, void *ra, void *xpc, void *context)
107 log_println("[signal_handle: trap %d]", type);
110 #if defined(ENABLE_VMLOG)
111 vmlog_cacao_signl_type(type);
114 /* Prevent compiler warnings. */
119 /* wrap the value into a handle if it is a reference */
120 /* BEFORE: creating stackframeinfo */
123 case TRAP_ClassCastException:
124 o = LLNI_WRAP((java_object_t *) val);
128 /* In this case the passed PV points to the compiler stub. We
129 get the methodinfo pointer here and set PV to NULL so
130 stacktrace_stackframeinfo_add determines the PV for the
131 parent Java method. */
133 m = code_get_methodinfo_for_pv(pv);
142 /* Fill and add a stackframeinfo. */
144 stacktrace_stackframeinfo_add(&sfi, pv, sp, ra, xpc);
147 case TRAP_NullPointerException:
148 p = exceptions_new_nullpointerexception();
151 case TRAP_ArithmeticException:
152 p = exceptions_new_arithmeticexception();
155 case TRAP_ArrayIndexOutOfBoundsException:
157 p = exceptions_new_arrayindexoutofboundsexception(index);
160 case TRAP_ArrayStoreException:
161 p = exceptions_new_arraystoreexception();
164 case TRAP_ClassCastException:
165 p = exceptions_new_classcastexception(o);
168 case TRAP_CHECK_EXCEPTION:
169 p = exceptions_fillinstacktrace();
173 #if defined(ENABLE_REPLACEMENT)
174 if (replace_me_wrapper(xpc, context)) {
179 p = patcher_handler(xpc);
183 p = jit_compile_handle(m, sfi.pv, ra, (void *) val);
186 #if defined(ENABLE_REPLACEMENT)
188 #if defined(__I386__)
189 replace_me_wrapper((char*)xpc - 13, context);
196 /* Let's try to get a backtrace. */
198 (void) methodtree_find(xpc);
200 /* If that does not work, print more debug info. */
202 log_println("signal_handle: unknown hardware exception type %d", type);
204 #if SIZEOF_VOID_P == 8
205 log_println("PC=0x%016lx", xpc);
207 log_println("PC=0x%08x", xpc);
210 #if defined(ENABLE_DISASSEMBLER)
211 log_println("machine instruction at PC:");
215 vm_abort("Exiting...");
217 /* keep compiler happy */
222 /* Remove stackframeinfo. */
224 stacktrace_stackframeinfo_remove(&sfi);
226 /* unwrap and return the exception object */
227 /* AFTER: removing stackframeinfo */
229 if (type == TRAP_COMPILER)
232 return LLNI_UNWRAP(p);
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