-/* src/vm/jit/m68k/linux/md-os.c - linux specific functions
+/* src/vm/jit/m68k/linux/md-os.c - m68k linux specific 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
This file is part of CACAO.
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: arch.h 5330 2006-09-05 18:43:12Z edwin $
-
*/
+
#include "config.h"
-#include "md-os.h"
-#include "md-abi.h"
+#include "vm/jit/m68k/md.h"
+#include "vm/jit/m68k/linux/md-abi.h"
+
+#include "vm/signallocal.hpp"
+#include "vm/vm.hpp"
-#include "vm/vm.h"
-#include "vm/exceptions.h"
#include "vm/jit/asmpart.h"
+#include "vm/jit/trap.hpp"
#include <assert.h>
#include <stdlib.h>
-#include <signal.h>
+/*#include <signal.h>*/
#include <stdint.h>
#include <sys/ucontext.h> /* has br0ken ucontext_t*/
actual_fpregset_t fpregs;
} actual_mcontext_t;
+#define GREGS_ADRREG_OFF 8
+
typedef struct actual_ucontext {
unsigned long uc_flags;
struct actual_ucontext *uc_link;
} actual_ucontext_t;
-/*
- * linux specific initializations
- */
-void md_init_linux()
-{
- struct sigaction act;
-
- act.sa_sigaction = md_signal_handler_sigill;
- act.sa_flags = SA_NODEFER | SA_SIGINFO;
-
- if (sigaction(SIGILL, &act, NULL) == -1) {
- vm_abort("md_linux_init: Error registering signal handler");
- }
-}
/* md_signal_handler_sigsegv ******************************************
*
- * BLA BLA
- */
-void md_signal_handler_sigsegv(/*int sig, siginfo_t *siginfo, void *_p*/)
+ * Invoked when a Nullpointerexception occured, or when the vm
+ * crashes, hard to tell the difference.
+ **********************************************************************/
+
+void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
{
- assert(0);
+ uint32_t xpc, sp;
+ uint16_t opc;
+ uint32_t val, regval, off;
+ bool adrreg;
+ void *p;
+ actual_mcontext_t *_mc;
+ actual_ucontext_t *_uc;
+ int type;
+
+ _uc = (actual_ucontext_t*)_p;
+ _mc = &_uc->uc_mcontext;
+ sp = _mc->gregs[R_SP];
+ xpc = _mc->gregs[R_PC];
+ opc = *(uint16_t*)xpc;
+
+ /* m68k uses a whole bunch of difficult to differ load instructions where null pointer check could occure */
+ /* the first two are 2*32bit sized */
+ adrreg = false;
+ off = 0;
+ if ((opc & ((2<<12) | (5<<3))) == ((2<<12) | (5<<3))) {
+ if (opc & (1<<6)) adrreg = true; /* M_XLD */
+ val = opc & 0x0007;
+ off = *(uint16_t*)(xpc+1);
+ } else if ((opc & ((2<<12) | (5<<6))) == ((2<<12) | (5<<6))) {
+ if (opc & (1<<3)) adrreg = true; /* M_XST */
+ val = (opc >> 9) & 0x0007;
+ off = *(uint16_t*)(xpc+1);
+ } else {
+
+ /*fprintf(stderr, "SEGV: short instructions %x\n", opc);
+ */
+ /* now check the 32 bit sized instructions */
+ if ((opc & (2<<3)) == (2<<3)) {
+ if (opc & (1<<6)) adrreg = true; /* M_L*X */
+ val = opc & 0x0007;
+ } else if ((opc & (2<<6)) == (2<<6)) {
+ if (opc & (1<<3)) adrreg = true; /* M_S*X */
+ val = (opc >> 9) & 0x0007;
+ } else {
+ vm_abort("md_signal_handler_sigsegv: unhandeled faulting opcode %x", opc);
+ }
+ }
+
+ /* val is now register number, adreg == true if it is an address regsiter */
+ regval = _mc->gregs[adrreg ? GREGS_ADRREG_OFF + val : val];
+ type = regval;
+
+ /* Handle the type. */
+
+ p = trap_handle(type, regval, NULL, (void*)sp, (void*)xpc, (void*)xpc, _p);
+
+ _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP1] = (intptr_t) p;
+ _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP2_XPC] = (intptr_t) xpc;
+ _mc->gregs[R_PC] = (intptr_t) asm_handle_exception;
}
-/*
+
+/* md_signal_handler_sigill *******************************************
+ *
* This handler is used to generate hardware exceptions.
* Type of exception derived from trap number.
* If an object is needed a tst instruction (2 byte long) has
* been created directly before the trap instruction (2 bytes long).
* the last 3 bit of this tst instruction contain the register number.
- */
-void md_signal_handler_sigill(int sig, siginfo_t *siginfo, actual_ucontext_t *_uc)
+ **********************************************************************/
+
+void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
{
- uint32_t xpc, sp;
+ uint32_t xpc, sp, ra, pv;
uint16_t opc;
uint32_t type;
- uint32_t val, regval;
- java_objectheader *e;
- mcontext_t *_mc;
+ uint32_t regval;
+ void *p;
+ actual_mcontext_t *_mc;
+ actual_ucontext_t *_uc;
+
+ _uc = (actual_ucontext_t*)_p;
+ xpc = (uint32_t)siginfo->si_addr;
+
+ pv = NULL; /* we have no pv */
+ ra = xpc; /* that is ture for most cases */
+ if (siginfo->si_code == ILL_ILLOPC) {
+ vm_abort("md_signal_handler_sigill: the illegal instruction @ 0x%x, aborting", xpc);
+ }
if (siginfo->si_code != ILL_ILLTRP) {
vm_abort("md_signal_handler_sigill: Caught something not a trap");
}
- xpc = siginfo->si_addr;
opc = *(uint16_t*)(xpc-2);
- if (opc == 0x4afc) {
- vm_abort("md_signal_handler_sigill: the illegal instruction @ 0x%x, aborting", xpc);
- }
-
assert( (opc&0xfff0) == 0x4e40 );
type = opc & 0x000f; /* filter trap number */
_mc = &_uc->uc_mcontext;
sp = _mc->gregs[R_SP];
- /* Figure out in which register the object causing the exception resides for exceptions
- * appropiate.
+ /* Figure out in which register the object causing the exception resides for appropiate exceptions
*/
switch (type) {
- case EXCEPTION_HARDWARE_CLASSCAST:
+ case TRAP_NullPointerException:
+ case TRAP_ArithmeticException:
+ case TRAP_CHECK_EXCEPTION:
+ /* nothing */
+ break;
+
+ case TRAP_ClassCastException:
+ regval = *(uint16_t*)(xpc-4);
+ assert( (regval&0xfff0) == 0x4a00 );
+ /* was in a address register */
+ regval = _mc->gregs[ GREGS_ADRREG_OFF + (regval & 0x7) ];
+ break;
+
+ case TRAP_ArrayIndexOutOfBoundsException:
+ regval = *(uint16_t*)(xpc-4);
+ assert( (regval&0xfff0) == 0x4a00 );
+ /* was a data register */
+ regval = _mc->gregs[regval & 0x7];
+ break;
+
+ case TRAP_COMPILER:
regval = *(uint16_t*)(xpc-4);
assert( (regval&0xfff0) == 0x4a00 );
/* was in a address register */
- regval = _mc->gregs[ 8 + (regval & 0x7) ];
+ regval = _mc->gregs[ GREGS_ADRREG_OFF + (regval & 0x7) ];
+
+ pv = xpc-4; /* the compiler stub consists of 2 instructions */
+ ra = md_stacktrace_get_returnaddress(sp, 0);
+ sp = sp + SIZEOF_VOID_P;
+ xpc = ra - 2;
+ break;
+
+ case TRAP_PATCHER:
+ xpc -= 2;
+ ra = xpc;
break;
- default: assert(0);
}
- fprintf(stderr, "NEW HWE: sp=%x, xpc=%x, tpye=%x, regval=%x\n", sp, xpc, type, regval);
- e = exceptions_new_hardware_exception(0, sp, xpc, xpc, type, regval);
+ /* Handle the trap. */
+
+ p = trap_handle(type, regval, pv, (void*)sp, (void*)ra, (void*)xpc, _p);
+
+ switch (type) {
+ case TRAP_COMPILER:
+ if (p == NULL) {
+ /* exception when compiling the method */
+ java_object_t *o = builtin_retrieve_exception();
+
+ _mc->gregs[R_SP] = sp; /* remove RA from stack */
- _mc->gregs[REG_ATMP1] = (ptrint) e;
- _mc->gregs[REG_ATMP2_XPC] = (ptrint) xpc;
- _mc->gregs[R_PC] = (ptrint) asm_handle_exception;
+ _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP1] = (uintptr_t) o;
+ _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP2_XPC] = (uintptr_t) xpc;
+ _mc->gregs[R_PC] = (uintptr_t) asm_handle_exception;
+ }
+ else {
+ /* compilation ok, execute */
+ _mc->gregs[R_PC] = p;
+ }
+ break;
+
+ case TRAP_PATCHER:
+ if (p == NULL) {
+ /* No exception while patching, continue. */
+ _mc->gregs[R_PC] = xpc;
+ return;
+ }
+ /* fall-through in case of exception */
+
+ default:
+ /* a normal exception with normal expcetion handling */
+ _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP1] = (uintptr_t) p;
+ _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP2_XPC] = (uintptr_t) xpc;
+ _mc->gregs[R_PC] = (uintptr_t) asm_handle_exception;
+ }
}
+
+
+/*
+ * 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
+ * Emacs will automagically detect them.
+ * ---------------------------------------------------------------------
+ * Local variables:
+ * mode: c
+ * indent-tabs-mode: t
+ * c-basic-offset: 4
+ * tab-width: 4
+ * End:
+ * vim:noexpandtab:sw=4:ts=4:
+ */
projects / cacao.git / blobdiff