1 /* src/vm/jit/trap.cpp - 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. */
35 #include "mm/memory.hpp"
37 #include "native/llni.h"
39 #include "toolbox/logging.hpp"
41 #include "vm/exceptions.hpp"
42 #include "vm/options.h"
46 #include "vm/jit/asmpart.h"
47 #include "vm/jit/code.hpp"
48 #include "vm/jit/disass.h"
49 #include "vm/jit/executionstate.h"
50 #include "vm/jit/jit.hpp"
51 #include "vm/jit/methodtree.h"
52 #include "vm/jit/patcher-common.hpp"
53 #include "vm/jit/replace.hpp"
54 #include "vm/jit/stacktrace.hpp"
61 * Mmap the first memory page to support hardware exceptions and check
62 * the maximum hardware trap displacement on the architectures where
63 * it is required (TRAP_INSTRUCTION_IS_LOAD defined to 1).
67 #if !(defined(__ARM__) && defined(__LINUX__))
68 /* On arm-linux the first memory page can't be mmap'ed, as it
69 contains the exception vectors. */
73 /* mmap a memory page at address 0x0, so our hardware-exceptions
76 pagesize = os::getpagesize();
78 (void) os::mmap_anonymous(NULL, pagesize, PROT_NONE, MAP_PRIVATE | MAP_FIXED);
81 TRACESUBSYSTEMINITIALIZATION("trap_init");
83 #if !defined(TRAP_INSTRUCTION_IS_LOAD)
84 # error TRAP_INSTRUCTION_IS_LOAD is not defined in your md-trap.h
87 #if TRAP_INSTRUCTION_IS_LOAD == 1
88 /* Check if we get into trouble with our hardware-exceptions. */
90 if (TRAP_END > OFFSET(java_bytearray_t, data))
91 vm_abort("trap_init: maximum hardware trap displacement is greater than the array-data offset: %d > %d", TRAP_END, OFFSET(java_bytearray_t, data));
97 * Handles the signal which is generated by trap instructions, caught
98 * by a signal handler and calls the correct function.
100 * @param type trap number
103 void* trap_handle(int type, intptr_t val, void *pv, void *sp, void *ra, void *xpc, void *context)
106 stackframeinfo_t sfi;
110 log_println("[signal_handle: trap %d]", type);
113 #if defined(ENABLE_VMLOG)
114 vmlog_cacao_signl_type(type);
117 /* Prevent compiler warnings. */
119 java_handle_t* o = NULL;
120 methodinfo* m = NULL;
122 #if defined(__ALPHA__) || defined(__ARM__) || defined(__I386__) || defined(__POWERPC__) || defined(__POWERPC64__) || defined(__X86_64__)
123 # if !defined(NDEBUG)
124 /* Perform a sanity check on our execution state functions. */
126 executionstate_sanity_check(context);
129 /* Read execution state from current context. */
132 md_executionstate_read(&es, context);
135 /* Do some preparations before we enter the nativeworld. */
136 /* BEFORE: creating stackframeinfo */
139 case TRAP_ClassCastException:
140 /* Wrap the value into a handle, as it is a reference. */
142 o = LLNI_WRAP((java_object_t *) val);
146 /* In this case the passed PV points to the compiler stub. We
147 get the methodinfo pointer here and set PV to NULL so
148 stacktrace_stackframeinfo_add determines the PV for the
149 parent Java method. */
151 m = code_get_methodinfo_for_pv(pv);
160 /* Fill and add a stackframeinfo. */
162 stacktrace_stackframeinfo_add(&sfi, pv, sp, ra, xpc);
164 /* Get resulting exception (or pointer to compiled method). */
171 case TRAP_NullPointerException:
172 p = exceptions_new_nullpointerexception();
175 case TRAP_ArithmeticException:
176 p = exceptions_new_arithmeticexception();
179 case TRAP_ArrayIndexOutOfBoundsException:
180 index = (int32_t) val;
181 p = exceptions_new_arrayindexoutofboundsexception(index);
184 case TRAP_ArrayStoreException:
185 p = exceptions_new_arraystoreexception();
188 case TRAP_ClassCastException:
189 p = exceptions_new_classcastexception(o);
192 case TRAP_CHECK_EXCEPTION:
193 p = exceptions_fillinstacktrace();
197 #if defined(ENABLE_REPLACEMENT)
198 if (replace_me_wrapper((uint8_t*) xpc, context)) {
203 p = patcher_handler((uint8_t*) xpc);
207 entry = jit_compile_handle(m, sfi.pv, ra, (void*) val);
211 #if defined(ENABLE_REPLACEMENT)
213 # if defined(__I386__)
214 replace_me_wrapper((char*)xpc - 13, context);
221 /* Let's try to get a backtrace. */
223 (void) methodtree_find(xpc);
225 /* If that does not work, print more debug info. */
227 log_println("signal_handle: unknown hardware exception type %d", type);
229 #if SIZEOF_VOID_P == 8
230 log_println("PC=0x%016lx", xpc);
232 log_println("PC=0x%08x", xpc);
235 #if defined(ENABLE_DISASSEMBLER)
236 log_println("machine instruction at PC:");
237 disassinstr((uint8_t*) xpc);
240 vm_abort("Exiting...");
242 /* keep compiler happy */
247 /* Remove stackframeinfo. */
249 stacktrace_stackframeinfo_remove(&sfi);
251 #if defined(__ALPHA__) || defined(__ARM__) || defined(__I386__) || defined(__POWERPC__) || defined(__POWERPC64__) || defined(__X86_64__)
252 /* Update execution state and set registers. */
253 /* AFTER: removing stackframeinfo */
257 // The normal case for a compiler trap is to jump directly to
258 // the newly compiled method.
261 es.pc = (uint8_t *) (uintptr_t) entry;
262 es.pv = (uint8_t *) (uintptr_t) entry;
266 // In case of an exception during JIT compilation, we fetch
267 // the exception here and proceed with exception handling.
269 p = exceptions_get_and_clear_exception();
272 // Get and set the PV from the parent Java method.
274 es.pv = (uint8_t *) md_codegen_get_pv_from_pc(ra);
276 // Now fall-through to default exception handling.
278 goto trap_handle_exception;
281 // The normal case for a patcher trap is to continue execution at
282 // the trap instruction. On some archs the PC may point after the
283 // trap instruction, so we reset it here.
286 es.pc = (uint8_t *) (uintptr_t) xpc;
290 // Fall-through to default exception handling.
292 trap_handle_exception:
295 es.intregs[REG_ITMP1_XPTR] = (uintptr_t) LLNI_DIRECT(p);
296 es.intregs[REG_ITMP2_XPC] = (uintptr_t) xpc;
297 es.pc = (uint8_t *) (uintptr_t) asm_handle_exception;
301 /* Write back execution state to current context. */
303 md_executionstate_write(&es, context);
306 /* Unwrap and return the exception object. */
307 /* AFTER: removing stackframeinfo */
309 if (type == TRAP_COMPILER)
312 return LLNI_UNWRAP(p);
321 * These are local overrides for various environment variables in Emacs.
322 * Please do not remove this and leave it at the end of the file, where
323 * Emacs will automagically detect them.
324 * ---------------------------------------------------------------------
327 * indent-tabs-mode: t