/* src/vm/jit/i386/linux/md-os.c - machine dependent i386 Linux functions
- Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
- C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
- E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
- J. Wenninger, Institut f. Computersprachen - TU Wien
+ Copyright (C) 1996-2005, 2006, 2007, 2008
+ CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
+ Copyright (C) 2009 Theobroma Systems Ltd.
This file is part of CACAO.
#include "vm/jit/i386/codegen.h"
#include "vm/jit/i386/md.h"
-#include "threads/threads-common.h"
+#include "threads/thread.hpp"
-#include "vm/builtin.h"
-#include "vm/exceptions.h"
-#include "vm/signallocal.h"
-#include "vm/stringlocal.h"
+#include "vm/signallocal.hpp"
-#include "vm/jit/asmpart.h"
-#include "vm/jit/stacktrace.h"
+#include "vm/jit/executionstate.h"
+#include "vm/jit/trap.hpp"
-/* md_signal_handler_sigsegv ***************************************************
-
- Signal handler for hardware exceptions.
-
-*******************************************************************************/
-
+/**
+ * Signal handler for hardware exceptions.
+ */
void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *pv;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
- u1 opc;
- u1 mod;
- u1 rm;
- s4 d;
- s4 disp;
- ptrint val;
- s4 type;
- void *p;
- java_object_t *o;
-
- _uc = (ucontext_t *) _p;
- _mc = &_uc->uc_mcontext;
-
- pv = NULL; /* is resolved during stackframeinfo creation */
- sp = (u1 *) _mc->gregs[REG_ESP];
- xpc = (u1 *) _mc->gregs[REG_EIP];
- ra = xpc; /* return address is equal to XPC */
-
- /* get exception-throwing instruction */
-
- opc = M_ALD_MEM_GET_OPC(xpc);
- mod = M_ALD_MEM_GET_MOD(xpc);
- rm = M_ALD_MEM_GET_RM(xpc);
-
- /* for values see emit_mov_mem_reg and emit_mem */
-
- if ((opc == 0x8b) && (mod == 0) && (rm == 5)) {
- /* this was a hardware-exception */
-
- d = M_ALD_MEM_GET_REG(xpc);
- disp = M_ALD_MEM_GET_DISP(xpc);
-
- /* we use the exception type as load displacement */
-
- type = disp;
-
- /* ATTENTION: The _mc->gregs layout is completely crazy! The
- registers are reversed starting with number 4 for REG_EDI
- (see /usr/include/sys/ucontext.h). We have to convert that
- here. */
-
- val = _mc->gregs[REG_EAX - d];
-
- if (type == EXCEPTION_HARDWARE_COMPILER) {
- /* The PV from the compiler stub is equal to the XPC. */
-
- pv = xpc;
-
- /* We use a framesize of zero here because the call pushed
- the return addres onto the stack. */
-
- ra = md_stacktrace_get_returnaddress(sp, 0);
-
- /* Skip the RA on the stack. */
+ ucontext_t* _uc = (ucontext_t *) _p;
+ mcontext_t* _mc = &_uc->uc_mcontext;
- sp = sp + 1 * SIZEOF_VOID_P;
+ void* xpc = (void*) _mc->gregs[REG_EIP];
- /* The XPC is the RA minus 2, because the RA points to the
- instruction after the call. */
-
- xpc = ra - 2;
- }
- }
- else {
- /* this was a normal NPE */
-
- type = EXCEPTION_HARDWARE_NULLPOINTER;
- val = 0;
- }
-
- /* Handle the type. */
-
- p = signal_handle(type, val, pv, sp, ra, xpc, _p);
-
- /* Set registers. */
-
- if (type == EXCEPTION_HARDWARE_COMPILER) {
- if (p == NULL) {
- o = builtin_retrieve_exception();
-
- _mc->gregs[REG_ESP] = (uintptr_t) sp; /* Remove RA from stack. */
-
- _mc->gregs[REG_EAX] = (uintptr_t) o;
- _mc->gregs[REG_ECX] = (uintptr_t) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_EIP] = (uintptr_t) asm_handle_exception;
- }
- else {
- _mc->gregs[REG_EIP] = (uintptr_t) p;
- }
- }
- else {
- _mc->gregs[REG_EAX] = (intptr_t) p;
- _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
- }
+ // Handle the trap.
+ trap_handle(TRAP_SIGSEGV, xpc, _p);
}
-/* md_signal_handler_sigfpe ****************************************************
-
- ArithmeticException signal handler for hardware divide by zero
- check.
-
-*******************************************************************************/
-
+/**
+ * Signal handler for hardware divide by zero (ArithmeticException)
+ * check.
+ */
void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *pv;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
- s4 type;
- ptrint val;
- void *p;
-
- _uc = (ucontext_t *) _p;
- _mc = &_uc->uc_mcontext;
-
- pv = NULL; /* is resolved during stackframeinfo creation */
- sp = (u1 *) _mc->gregs[REG_ESP];
- xpc = (u1 *) _mc->gregs[REG_EIP];
- ra = xpc; /* return address is equal to xpc */
-
- /* this is an ArithmeticException */
+ ucontext_t* _uc = (ucontext_t *) _p;
+ mcontext_t* _mc = &_uc->uc_mcontext;
- type = EXCEPTION_HARDWARE_ARITHMETIC;
- val = 0;
+ void* xpc = (void*) _mc->gregs[REG_EIP];
- /* Handle the type. */
-
- p = signal_handle(type, val, pv, sp, ra, xpc, _p);
-
- /* set registers */
-
- _mc->gregs[REG_EAX] = (intptr_t) p;
- _mc->gregs[REG_ECX] = (intptr_t) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_EIP] = (intptr_t) asm_handle_exception;
+ // Handle the trap.
+ trap_handle(TRAP_SIGFPE, xpc, _p);
}
-/* md_signal_handler_sigill ****************************************************
-
- Signal handler for hardware patcher traps (ud2).
-
-*******************************************************************************/
-
+/**
+ * Signal handler for hardware patcher traps (ud2).
+ */
void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *pv;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
- s4 type;
- ptrint val;
- void *p;
-
- _uc = (ucontext_t *) _p;
- _mc = &_uc->uc_mcontext;
-
- pv = NULL; /* is resolved during stackframeinfo creation */
- sp = (u1 *) _mc->gregs[REG_ESP];
- xpc = (u1 *) _mc->gregs[REG_EIP];
- ra = xpc; /* return address is equal to xpc */
-
- /* this is an ArithmeticException */
-
- type = EXCEPTION_HARDWARE_PATCHER;
- val = 0;
-
- /* generate appropriate exception */
-
- p = signal_handle(type, val, pv, sp, ra, xpc, _p);
-
- /* set registers (only if exception object ready) */
-
- if (p != NULL) {
- _mc->gregs[REG_EAX] = (ptrint) p;
- _mc->gregs[REG_ECX] = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->gregs[REG_EIP] = (ptrint) asm_handle_exception;
- }
-}
-
-
-/* md_signal_handler_sigusr1 ***************************************************
-
- Signal handler for suspending threads.
-
-*******************************************************************************/
-
-#if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
-void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
-{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *pc;
- u1 *sp;
+ ucontext_t* _uc = (ucontext_t *) _p;
+ mcontext_t* _mc = &_uc->uc_mcontext;
- _uc = (ucontext_t *) _p;
- _mc = &_uc->uc_mcontext;
-
- /* get the PC and SP for this thread */
- pc = (u1 *) _mc->gregs[REG_EIP];
- sp = (u1 *) _mc->gregs[REG_ESP];
+ void* xpc = (void*) _mc->gregs[REG_EIP];
- /* now suspend the current thread */
- threads_suspend_ack(pc, sp);
+ // Handle the trap.
+ trap_handle(TRAP_SIGILL, xpc, _p);
}
-#endif
/* md_signal_handler_sigusr2 ***************************************************
#endif
-/* md_critical_section_restart *************************************************
+/* md_executionstate_read ******************************************************
- Search the critical sections tree for a matching section and set
- the PC to the restart point, if necessary.
+ Read the given context into an executionstate for Replacement.
*******************************************************************************/
-#if defined(ENABLE_THREADS)
-void md_critical_section_restart(ucontext_t *_uc)
+void md_executionstate_read(executionstate_t *es, void *context)
{
+ ucontext_t *_uc;
mcontext_t *_mc;
- u1 *pc;
- u1 *npc;
+ s4 i;
+ _uc = (ucontext_t *) context;
_mc = &_uc->uc_mcontext;
- pc = (u1 *) _mc->gregs[REG_EIP];
+ /* read special registers */
+ es->pc = (u1 *) _mc->gregs[REG_EIP];
+ es->sp = (u1 *) _mc->gregs[REG_ESP];
+ es->pv = NULL; /* pv must be looked up via AVL tree */
- npc = critical_find_restart_point(pc);
+ /* read integer registers */
+ for (i = 0; i < INT_REG_CNT; i++)
+ es->intregs[i] = _mc->gregs[REG_EAX - i];
- if (npc != NULL)
- _mc->gregs[REG_EIP] = (ptrint) npc;
+ /* read float registers */
+ for (i = 0; i < FLT_REG_CNT; i++)
+ es->fltregs[i] = 0xdeadbeefdeadbeefULL;
+}
+
+
+/* md_executionstate_write *****************************************************
+
+ Write the given executionstate back to the context for Replacement.
+
+*******************************************************************************/
+
+void md_executionstate_write(executionstate_t *es, void *context)
+{
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ s4 i;
+
+ _uc = (ucontext_t *) context;
+ _mc = &_uc->uc_mcontext;
+
+ /* write integer registers */
+ for (i = 0; i < INT_REG_CNT; i++)
+ _mc->gregs[REG_EAX - i] = es->intregs[i];
+
+ /* write special registers */
+ _mc->gregs[REG_EIP] = (ptrint) es->pc;
+ _mc->gregs[REG_ESP] = (ptrint) es->sp;
}
-#endif
/*
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