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src/share/vm/utilities/debug.cpp
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rev 7417 : improve secondary signal handling
@@ -306,28 +306,95 @@
}
#ifndef PRODUCT
#include <signal.h>
+typedef void (*voidfun_t)();
+// Crash with an authentic sigill at a known PC.
+static void crash_with_sigill() {
+ bool rc = false;
+ const size_t size = os::vm_page_size();
+ static void* pc = NULL;
+ if (!pc) {
+ void* p = os::reserve_memory(size, NULL, 0);
+ if (p) {
+ bool rc = os::commit_memory((char*)p, size, true);
+ if (rc) {
+ memset(p, 0, size);
+ memcpy(p, illegal_instruction_sequence,
+ sizeof(illegal_instruction_sequence));
+ pc = p;
+ }
+ }
+ }
+
+ guarantee(pc, "failed to initialized sigill test blob");
+
+ tty->print_cr("will jump to PC " PTR_FORMAT
+ ", which should cause a SIGILL.", pc);
+ tty->flush();
+
+ volatile voidfun_t g_voidfun = NULL;
+
+#if defined(IA64) || defined(PPC64)
+ // on ia64 and on ppc we have function descriptors.
+ struct { void* p1; void* p2; } fundes =
+ { pc, pc };
+ void* p = (void*)(&fundes);
+ g_voidfun = (voidfun_t) (p);
+#else
+ g_voidfun = (voidfun_t)pc;
+#endif
+
+ g_voidfun(); // boom.
+
+} // end: crash_with_sigill
+
+// crash with sigsegv at non-null address.
+static void crash_with_segfault() {
+
+ char* const crash_addr = (char*) get_segfault_address();
+
+ tty->print_cr("will access address " PTR_FORMAT
+ ", which should cause a SIGSEGV.", crash_addr);
+ tty->flush();
+
+ *crash_addr = 'X';
+
+} // end: crash_with_segfault
+
+// returns an address which is guaranteed to generate a SIGSEGV on read,
+// for test purposes, which is not NULL and contains bits in every word
+void* get_segfault_address() {
+ return (void*)
+#ifdef _LP64
+ 0xABC0000000000ABCULL;
+#else
+ 0x00000ABC;
+#endif
+}
+
void test_error_handler() {
- uintx test_num = ErrorHandlerTest;
- if (test_num == 0) return;
+ controlled_crash(ErrorHandlerTest);
+}
+
+void controlled_crash(int how) {
+ if (how == 0) return;
// If asserts are disabled, use the corresponding guarantee instead.
- size_t n = test_num;
- NOT_DEBUG(if (n <= 2) n += 2);
+ NOT_DEBUG(if (how <= 2) how += 2);
const char* const str = "hello";
const size_t num = (size_t)os::vm_page_size();
const char* const eol = os::line_separator();
const char* const msg = "this message should be truncated during formatting";
char * const dataPtr = NULL; // bad data pointer
const void (*funcPtr)(void) = (const void(*)()) 0xF; // bad function pointer
// Keep this in sync with test/runtime/6888954/vmerrors.sh.
- switch (n) {
+ switch (how) {
case 1: assert(str == NULL, "expected null");
case 2: assert(num == 1023 && *str == 'X',
err_msg("num=" SIZE_FORMAT " str=\"%s\"", num, str));
case 3: guarantee(str == NULL, "expected null");
case 4: guarantee(num == 1023 && *str == 'X',
@@ -348,12 +415,14 @@
// so "break" out to the ShouldNotReachHere().
case 12: *dataPtr = '\0'; break;
// There's no guarantee the bad function pointer will crash us
// so "break" out to the ShouldNotReachHere().
case 13: (*funcPtr)(); break;
+ case 14: crash_with_segfault(); break;
+ case 15: crash_with_sigill(); break;
- default: tty->print_cr("ERROR: %d: unexpected test_num value.", n);
+ default: tty->print_cr("ERROR: %d: unexpected test_num value.", how);
}
ShouldNotReachHere();
}
#endif // !PRODUCT
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