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"
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;
/* 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 cm
+ * crashes, hard to tell the difference.
+ **********************************************************************/
+void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, actual_ucontext_t *_uc)
{
- assert(0);
+ stackframeinfo sfi;
+ uint32_t xpc, sp;
+ uint16_t opc;
+ uint32_t val, regval, off;
+ bool adrreg;
+ void *p;
+ mcontext_t *_mc;
+
+ _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];
+ /*
+ if (regval != 0) {
+ vm_abort("md_signal_handler_sigsegv: faulting address is not NULL: addr=%p", regval);
+ }*/
+
+
+ /*fprintf(stderr, "SEGV: sp=%x, xpc=%x, regval=%x\n", sp, xpc, regval);
+ */
+
+ /* create stackframeinfo */
+
+ stacktrace_create_extern_stackframeinfo(&sfi, NULL, sp, xpc, xpc);
+
+ /* Handle the type. */
+
+ p = signal_handle(xpc, EXCEPTION_HARDWARE_NULLPOINTER, regval);
+
+ /* remove stackframeinfo */
+
+ stacktrace_remove_stackframeinfo(&sfi);
+
+ _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)
{
+ stackframeinfo sfi;
uint32_t xpc, sp;
uint16_t opc;
uint32_t type;
uint32_t val, regval;
- java_objectheader *e;
+ void *p;
mcontext_t *_mc;
+ xpc = siginfo->si_addr;
+
+ 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_ARITHMETIC:
+ case EXCEPTION_HARDWARE_EXCEPTION:
+ /* nothing */
+ break;
case EXCEPTION_HARDWARE_CLASSCAST:
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) ];
+ break;
+ case EXCEPTION_HARDWARE_ARRAYINDEXOUTOFBOUNDS:
+ regval = *(uint16_t*)(xpc-4);
+ assert( (regval&0xfff0) == 0x4a00 );
+ /* was a data register */
+ regval = _mc->gregs[regval & 0x7];
+ break;
+ case M68K_EXCEPTION_HARDWARE_NULLPOINTER:
+ type = EXCEPTION_HARDWARE_NULLPOINTER;
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);
+ /*fprintf(stderr, "NEW HWE: sp=%x, xpc=%x, tpye=%x, regval=%x\n", sp, xpc, type, regval);
+ */
+
+ /* create stackframeinfo */
+
+ stacktrace_create_extern_stackframeinfo(&sfi, NULL, sp, xpc, xpc);
+
+ /* Handle the type. */
+
+ p = signal_handle(xpc, type, val);
+
+ /* remove stackframeinfo */
- _mc->gregs[REG_ATMP1] = (ptrint) e;
- _mc->gregs[REG_ATMP2_XPC] = (ptrint) xpc;
- _mc->gregs[R_PC] = (ptrint) asm_handle_exception;
+ stacktrace_remove_stackframeinfo(&sfi);
+
+ _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;
}
+
+
+/*
+ * 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:
+ */
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