/* src/vm/jit/i386/freebsd/md-os.c - machine dependent i386 FreeBSD functions
- Copyright (C) 1996-2005, 2006 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
This file is part of CACAO.
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- Contact: cacao@cacaojvm.org
-
- Authors: Christian Thalinger
-
- Changes:
-
*/
#include "config.h"
+#include <stdint.h>
#include <ucontext.h>
-#include "vm/jit/i386/md-abi.h"
+#include "vm/types.h"
+
+#include "vm/jit/i386/codegen.h"
+#include "vm/jit/i386/md.h"
+
+#include "threads/thread.hpp"
+
+#include "vm/jit/builtin.hpp"
+#include "vm/signallocal.hpp"
-#include "vm/exceptions.h"
-#include "vm/signallocal.h"
#include "vm/jit/asmpart.h"
-#include "vm/jit/stacktrace.h"
+#include "vm/jit/executionstate.h"
+#include "vm/jit/stacktrace.hpp"
+#include "vm/jit/trap.hpp"
/* md_signal_handler_sigsegv ***************************************************
- NullPointerException signal handler for hardware null pointer
- check.
+ Signal handler for hardware exceptions.
*******************************************************************************/
void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
+ 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;
_uc = (ucontext_t *) _p;
_mc = &_uc->uc_mcontext;
-
+
+ pv = NULL; /* is resolved during stackframeinfo creation */
sp = (u1 *) _mc->mc_esp;
xpc = (u1 *) _mc->mc_eip;
- ra = xpc; /* return address is equal to xpc */
+ 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;
+
+ switch (d) {
+ case EAX:
+ val = _mc->mc_eax;
+ break;
+ case ECX:
+ val = _mc->mc_ecx;
+ break;
+ case EDX:
+ val = _mc->mc_edx;
+ break;
+ case EBX:
+ val = _mc->mc_ebx;
+ break;
+ case ESP:
+ val = _mc->mc_esp;
+ break;
+ case EBP:
+ val = _mc->mc_ebp;
+ break;
+ case ESI:
+ val = _mc->mc_esi;
+ break;
+ case EDI:
+ val = _mc->mc_edi;
+ break;
+ default:
+ vm_abort("md_signal_handler_sigsegv: Unkown register %d", d);
+ }
+
+ if (type == TRAP_COMPILER) {
+ /* The PV from the compiler stub is equal to the XPC. */
+
+ pv = xpc;
- _mc->mc_eax =
- (ptrint) stacktrace_hardware_nullpointerexception(NULL, sp, ra, xpc);
-
- _mc->mc_ecx = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->mc_eip = (ptrint) asm_handle_exception;
+ /* 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. */
+
+ sp = sp + 1 * SIZEOF_VOID_P;
+
+ /* 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 = TRAP_NullPointerException;
+ val = 0;
+ }
+
+ /* Handle the trap. */
+
+ p = trap_handle(type, val, pv, sp, ra, xpc, _p);
+
+ /* Set registers. */
+
+ if (type == TRAP_COMPILER) {
+ if (p == NULL) {
+ _mc->mc_esp = (uintptr_t) sp; // Remove RA from stack.
+ }
+ }
}
void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pv;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
+ s4 type;
+ ptrint val;
_uc = (ucontext_t *) _p;
_mc = &_uc->uc_mcontext;
+ pv = NULL; /* is resolved during stackframeinfo creation */
sp = (u1 *) _mc->mc_esp;
xpc = (u1 *) _mc->mc_eip;
ra = xpc; /* return address is equal to xpc */
- _mc->mc_eax =
- (ptrint) stacktrace_hardware_arithmeticexception(NULL, sp, ra, xpc);
-
- _mc->mc_ecx = (ptrint) xpc; /* REG_ITMP2_XPC */
- _mc->mc_eip = (ptrint) asm_handle_exception;
+ /* This is an ArithmeticException. */
+
+ type = TRAP_ArithmeticException;
+ val = 0;
+
+ /* Handle the trap. */
+
+ trap_handle(type, val, pv, sp, ra, xpc, _p);
+}
+
+
+/* md_signal_handler_sigill ****************************************************
+
+ 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;
+
+ _uc = (ucontext_t *) _p;
+ _mc = &_uc->uc_mcontext;
+
+ pv = NULL; /* is resolved during stackframeinfo creation */
+ sp = (u1 *) _mc->mc_esp;
+ xpc = (u1 *) _mc->mc_eip;
+ ra = xpc; /* return address is equal to xpc */
+
+ // Check if the trap instruction is valid.
+ // TODO Move this into patcher_handler.
+ if (patcher_is_valid_trap_instruction_at(xpc) == false) {
+ // Check if the PC has been patched during our way to this
+ // signal handler (see PR85).
+ if (patcher_is_patched_at(xpc) == true)
+ return;
+
+ // We have a problem...
+ log_println("md_signal_handler_sigill: Unknown illegal instruction at 0x%lx", xpc);
+#if defined(ENABLE_DISASSEMBLER)
+ (void) disassinstr(xpc);
+#endif
+ vm_abort("Aborting...");
+ }
+
+ type = TRAP_PATCHER;
+ val = 0;
+
+ /* Handle the trap. */
+
+ trap_handle(type, val, pv, sp, ra, xpc, _p);
}
+/* md_signal_handler_sigusr2 ***************************************************
+
+ Signal handler for profiling sampling.
+
+*******************************************************************************/
+
#if defined(ENABLE_THREADS)
-void thread_restartcriticalsection(ucontext_t *uc)
+void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
{
- void *critical;
+ threadobject *t;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pc;
- critical = critical_find_restart_point((void *) uc->uc_mcontext.mc_eip);
+ t = THREADOBJECT;
- if (critical)
- uc->uc_mcontext.mc_eip = (ptrint) critical;
+ _uc = (ucontext_t *) _p;
+ _mc = &_uc->uc_mcontext;
+
+ pc = (u1 *) _mc->mc_eip;
+
+ t->pc = pc;
}
#endif
+/* md_executionstate_read ******************************************************
+
+ Read the given context into an executionstate for Replacement.
+
+*******************************************************************************/
+
+void md_executionstate_read(executionstate_t* es, void* context)
+{
+ ucontext_t* _uc = (ucontext_t*) context;
+ mcontext_t* _mc = &_uc->uc_mcontext;
+
+ // Read special registers.
+ es->pc = (u1 *) _mc->mc_eip;
+ es->sp = (u1 *) _mc->mc_esp;
+ es->pv = NULL; /* pv must be looked up via AVL tree */
+
+ // Read integer registers.
+ es->intregs[EAX] = _mc->mc_eax;
+ es->intregs[ECX] = _mc->mc_ecx;
+ es->intregs[EDX] = _mc->mc_edx;
+ es->intregs[EBX] = _mc->mc_ebx;
+ es->intregs[ESP] = _mc->mc_esp;
+ es->intregs[EBP] = _mc->mc_ebp;
+ es->intregs[ESI] = _mc->mc_esi;
+ es->intregs[EDI] = _mc->mc_edi;
+
+ // Read float registers.
+ for (int 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 = (ucontext_t*) context;
+ mcontext_t* _mc = &_uc->uc_mcontext;
+
+ // Write integer registers.
+ _mc->mc_eax = es->intregs[EAX];
+ _mc->mc_ecx = es->intregs[ECX];
+ _mc->mc_edx = es->intregs[EDX];
+ _mc->mc_ebx = es->intregs[EBX];
+ _mc->mc_esp = es->intregs[ESP];
+ _mc->mc_ebp = es->intregs[EBP];
+ _mc->mc_esi = es->intregs[ESI];
+ _mc->mc_edi = es->intregs[EDI];
+
+ // Write special registers.
+ _mc->mc_eip = (uintptr_t) es->pc;
+ _mc->mc_esp = (uintptr_t) es->sp;
+}
+
+
/*
* These are local overrides for various environment variables in Emacs.
* Please do not remove this and leave it at the end of the file, where
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