Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: md-os.c 7311 2007-02-09 13:20:27Z twisti $
+ $Id: md-os.c 7582 2007-03-26 09:27:10Z tbfg $
*/
#include "vm/types.h"
+#include "vm/jit/powerpc64/codegen.h"
#include "vm/jit/powerpc64/linux/md-abi.h"
#if defined(ENABLE_THREADS)
/* 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;
- u4 instr;
- s4 reg;
- ptrint addr;
- u1 *pv;
- u1 *sp;
- u1 *ra;
- u1 *xpc;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pv;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
+ u4 mcode;
+ s4 s1;
+ s4 disp;
+ s4 d;
+ s4 type;
+ ptrint addr;
+ ptrint val;
+ java_objectheader *e;
_uc = (ucontext_t *) _p;
_mc = &(_uc->uc_mcontext);
-
- pv = (u1 *) _mc->gp_regs[REG_PV];
- sp = (u1 *) _mc->gp_regs[REG_SP];
- ra = (u1 *) _mc->gp_regs[PT_LNK]; /* this is correct for leafs */
- xpc = (u1 *) _mc->gp_regs[PT_NIP];
-
- instr = *((u4 *) xpc);
- reg = (instr >> 16) & 0x1f;
- addr = _mc->gp_regs[reg];
-
- if (addr == 0) {
- _mc->gp_regs[REG_ITMP1_XPTR] =
- (ptrint) stacktrace_hardware_nullpointerexception(pv, sp, ra, xpc);
-
- _mc->gp_regs[REG_ITMP2_XPC] = (ptrint) xpc;
- _mc->gp_regs[PT_NIP] = (ptrint) asm_handle_exception;
- }
- else {
- codegen_get_pv_from_pc(xpc);
- /* this should not happen */
+ /* get register values */
+ pv = (u1*) _mc->gp_regs[REG_PV];
+ sp = (u1*) _mc->gp_regs[REG_SP];
+ ra = (u1*) _mc->gp_regs[PT_LNK]; /* correct for leafs */
+ xpc =(u1*) _mc->gp_regs[PT_NIP];
+
+ /* get the throwing instruction */
+ mcode = *((u4*)xpc);
+
+ s1 = M_INSTR_OP2_IMM_A(mcode);
+ disp = M_INSTR_OP2_IMM_I(mcode);
+ d = M_INSTR_OP2_IMM_D(mcode);
+
+ val = _mc->gp_regs[d];
+
+ if (s1 == REG_ZERO) {
+ /* we use the exception type as load displacement */
+ type = disp;
+ } else {
+ /* normal NPE */
+ addr = _mc->gp_regs[s1];
+ type = (s4) addr;
+ }
+ e = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val);
- assert(0);
- }
+ _mc->gp_regs[REG_ITMP1] = (ptrint) e;
+ _mc->gp_regs[REG_ITMP2_XPC] = (ptrint) xpc;
+ _mc->gp_regs[PT_NIP] = (ptrint) asm_handle_exception;
}