/* src/vm/jit/x86_64/md.c - machine dependent x86_64 Linux functions
- Copyright (C) 1996-2005 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 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
This file is part of CACAO.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA.
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA.
- Contact: cacao@complang.tuwien.ac.at
+ Contact: cacao@cacaojvm.org
Authors: Christian Thalinger
- Changes:
+ Changes: Edwin Steiner
- $Id: md.c 2742 2005-06-20 09:58:48Z twisti $
+ $Id: md.c 5233 2006-08-14 10:59:39Z twisti $
*/
#define _GNU_SOURCE
+#include "config.h"
+
+#include <assert.h>
#include <stdlib.h>
#include <ucontext.h>
-#include "config.h"
#include "vm/jit/x86_64/md-abi.h"
-#include "vm/options.h"
-#include "vm/stringlocal.h"
+#if defined(ENABLE_THREADS)
+# include "threads/native/threads.h"
+#endif
+
+#include "vm/exceptions.h"
+#include "vm/signallocal.h"
#include "vm/jit/asmpart.h"
+#include "vm/jit/stacktrace.h"
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+#include "vm/options.h" /* XXX debug */
+#include "vm/jit/disass.h" /* XXX debug */
+#endif
+
+
+/* md_init *********************************************************************
+
+ Do some machine dependent initialization.
+
+*******************************************************************************/
+
+void md_init(void)
+{
+ /* nothing to do */
+}
-/* catch_NullPointerException **************************************************
+/* md_signal_handler_sigsegv ***************************************************
- NullPointerException signal handler for hardware null pointer check.
+ NullPointerException signal handler for hardware null pointer
+ check.
*******************************************************************************/
-void catch_NullPointerException(int sig, siginfo_t *siginfo, void *_p)
+void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- struct sigaction act;
- sigset_t nsig;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
_uc = (ucontext_t *) _p;
_mc = &_uc->uc_mcontext;
- /* Reset signal handler - necessary for SysV, does no harm for BSD */
-
- act.sa_sigaction = catch_NullPointerException; /* reinstall handler */
- act.sa_flags = SA_SIGINFO;
- sigaction(sig, &act, NULL);
-
- sigemptyset(&nsig);
- sigaddset(&nsig, sig);
- sigprocmask(SIG_UNBLOCK, &nsig, NULL); /* unblock signal */
+ /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
+ different to the ones in <ucontext.h>. */
+
+ sp = (u1 *) _mc->gregs[REG_RSP];
+ xpc = (u1 *) _mc->gregs[REG_RIP];
+ ra = xpc; /* return address is equal to xpc */
+
+#if 0
+ /* check for StackOverflowException */
+
+ threads_check_stackoverflow(sp);
+#endif
- _mc->gregs[REG_RAX] = (ptrint) string_java_lang_NullPointerException;
- _mc->gregs[REG_R10] = _mc->gregs[REG_RIP]; /* REG_ITMP2_XPC */
- _mc->gregs[REG_RIP] = (ptrint) asm_throw_and_handle_exception;
+ _mc->gregs[REG_RAX] =
+ (ptrint) stacktrace_hardware_nullpointerexception(NULL, sp, ra, xpc);
+
+ _mc->gregs[REG_R10] = (ptrint) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_RIP] = (ptrint) asm_handle_exception;
}
-/* catch_ArithmeticException ***************************************************
+/* md_signal_handler_sigfpe ****************************************************
- ArithmeticException signal handler for hardware divide by zero check.
+ ArithmeticException signal handler for hardware divide by zero
+ check.
*******************************************************************************/
-void catch_ArithmeticException(int sig, siginfo_t *siginfo, void *_p)
+void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- struct sigaction act;
- sigset_t nsig;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *sp;
+ u1 *ra;
+ u1 *xpc;
_uc = (ucontext_t *) _p;
_mc = &_uc->uc_mcontext;
- /* Reset signal handler - necessary for SysV, does no harm for BSD */
+ /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
+ different to the ones in <ucontext.h>. */
- act.sa_sigaction = catch_ArithmeticException; /* reinstall handler */
- act.sa_flags = SA_SIGINFO;
- sigaction(sig, &act, NULL);
+ sp = (u1 *) _mc->gregs[REG_RSP];
+ xpc = (u1 *) _mc->gregs[REG_RIP];
+ ra = xpc; /* return address is equal to xpc */
- sigemptyset(&nsig);
- sigaddset(&nsig, sig);
- sigprocmask(SIG_UNBLOCK, &nsig, NULL); /* unblock signal */
+ _mc->gregs[REG_RAX] =
+ (ptrint) stacktrace_hardware_arithmeticexception(NULL, sp, ra, xpc);
- _mc->gregs[REG_R10] = _mc->gregs[REG_RIP]; /* REG_ITMP2_XPC */
- _mc->gregs[REG_RIP] =
- (ptrint) asm_throw_and_handle_hardware_arithmetic_exception;
+ _mc->gregs[REG_R10] = (ptrint) xpc; /* REG_ITMP2_XPC */
+ _mc->gregs[REG_RIP] = (ptrint) asm_handle_exception;
}
-/* handler_signal_quit *********************************************************
+/* md_signal_handler_sigusr2 ***************************************************
- XXX
+ Signal handler for profiling sampling.
*******************************************************************************/
-#if defined(USE_THREADS) && defined(NATIVE_THREADS)
-void handler_signal_quit(int sig, siginfo_t *siginfo, void *_p)
+#if defined(ENABLE_THREADS)
+void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
{
- struct sigaction act;
- sigset_t nsig;
+ threadobject *t;
+ ucontext_t *_uc;
+ mcontext_t *_mc;
+ u1 *pc;
- /* Reset signal handler - necessary for SysV, does no harm for BSD */
+ t = THREADOBJECT;
- act.sa_sigaction = handler_signal_quit; /* reinstall handler */
- act.sa_flags = SA_SIGINFO;
- sigaction(sig, &act, NULL);
+ _uc = (ucontext_t *) _p;
+ _mc = &_uc->uc_mcontext;
- sigemptyset(&nsig);
- sigaddset(&nsig, sig);
- sigprocmask(SIG_UNBLOCK, &nsig, NULL); /* unblock signal */
+ /* ATTENTION: Don't use CACAO's internal REG_* defines as they are
+ different to the ones in <ucontext.h>. */
- /* do thread dump */
+ pc = (u1 *) _mc->gregs[REG_RIP];
- thread_dump();
+ t->pc = pc;
}
#endif
-void init_exceptions(void)
+#if defined(ENABLE_THREADS)
+void thread_restartcriticalsection(ucontext_t *_uc)
{
- struct sigaction act;
+ mcontext_t *_mc;
+ void *pc;
- /* install signal handlers we need to convert to exceptions */
+ _mc = &_uc->uc_mcontext;
- sigemptyset(&act.sa_mask);
+ pc = critical_find_restart_point((void *) _mc->gregs[REG_RIP]);
- if (!checknull) {
-#if defined(SIGSEGV)
- act.sa_sigaction = catch_NullPointerException;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGSEGV, &act, NULL);
+ if (pc != NULL)
+ _mc->gregs[REG_RIP] = (ptrint) pc;
+}
#endif
-#if defined(SIGBUS)
- act.sa_sigaction = catch_NullPointerException;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGBUS, &act, NULL);
-#endif
+
+/* md_stacktrace_get_returnaddress *********************************************
+
+ Returns the return address of the current stackframe, specified by
+ the passed stack pointer and the stack frame size.
+
+*******************************************************************************/
+
+u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
+{
+ u1 *ra;
+
+ /* on x86_64 the return address is above the current stack frame */
+
+ ra = *((u1 **) (sp + framesize));
+
+ return ra;
+}
+
+
+/* md_get_method_patch_address *************************************************
+
+ Gets the patch address of the currently compiled method. The offset
+ is extracted from the load instruction(s) before the jump and added
+ to the right base address (PV or REG_METHODPTR).
+
+ INVOKESTATIC/SPECIAL:
+
+ 4d 8b 15 e2 fe ff ff mov -286(%rip),%r10
+ 49 ff d2 rex64Z callq *%r10
+
+ INVOKEVIRTUAL:
+
+ 4c 8b 17 mov (%rdi),%r10
+ 49 8b 82 00 00 00 00 mov 0x0(%r10),%rax
+ 48 ff d3 rex64 callq *%rax
+
+ INVOKEINTERFACE:
+
+ 4c 8b 17 mov (%rdi),%r10
+ 4d 8b 92 00 00 00 00 mov 0x0(%r10),%r10
+ 49 8b 82 00 00 00 00 mov 0x0(%r10),%rax
+ 48 ff d3 rex64 callq *%r11
+
+*******************************************************************************/
+
+u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
+{
+ u1 mcode;
+ s4 offset;
+ u1 *pa; /* patch address */
+
+ /* go back to the actual call instruction (3-bytes) */
+
+ ra = ra - 3;
+
+ /* get the last byte of the call */
+
+ mcode = ra[2];
+
+ /* check for the different calls */
+
+ if (mcode == 0xd2) {
+ /* INVOKESTATIC/SPECIAL */
+
+ /* Get the offset from the instruction (the offset address is
+ 4-bytes before the call instruction). */
+
+ offset = *((s4 *) (ra - 4));
+
+ /* add the offset to the return address (IP-relative addressing) */
+
+ pa = ra + offset;
}
+ else if (mcode == 0xd3) {
+ /* INVOKEVIRTUAL/INTERFACE */
- act.sa_sigaction = catch_ArithmeticException;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGFPE, &act, NULL);
+ /* Get the offset from the instruction (the offset address is
+ 4-bytes before the call instruction). */
-#if defined(USE_THREADS) && defined(NATIVE_THREADS)
- /* catch SIGQUIT for thread dump */
+ offset = *((s4 *) (ra - 4));
- act.sa_sigaction = handler_signal_quit;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGQUIT, &act, NULL);
-#endif
+ /* add the offset to the method pointer */
+
+ pa = mptr + offset;
+ }
+ else {
+ /* catch any problems */
+
+ assert(0);
+ }
+
+ return pa;
}
-#if defined(USE_THREADS) && defined(NATIVE_THREADS)
-void thread_restartcriticalsection(ucontext_t *uc)
+/* md_codegen_get_pv_from_pc ***************************************************
+
+ On this architecture just a wrapper function to
+ codegen_get_pv_from_pc.
+
+*******************************************************************************/
+
+u1 *md_codegen_get_pv_from_pc(u1 *ra)
{
- void *critical;
+ u1 *pv;
- critical = thread_checkcritical((void *) uc->uc_mcontext.gregs[REG_RIP]);
+ /* Get the start address of the function which contains this
+ address from the method table. */
- if (critical)
- uc->uc_mcontext.gregs[REG_RIP] = (ptrint) critical;
+ pv = codegen_get_pv_from_pc(ra);
+
+ return pv;
}
-#endif
+/* md_cacheflush ***************************************************************
+
+ Calls the system's function to flush the instruction and data
+ cache.
+
+*******************************************************************************/
+
+void md_cacheflush(u1 *addr, s4 nbytes)
+{
+ /* do nothing */
+}
+
+
+/* md_icacheflush **************************************************************
+
+ Calls the system's function to flush the instruction cache.
+
+*******************************************************************************/
+
+void md_icacheflush(u1 *addr, s4 nbytes)
+{
+ /* do nothing */
+}
+
+
+/* md_dcacheflush **************************************************************
+
+ Calls the system's function to flush the data cache.
+
+*******************************************************************************/
+
+void md_dcacheflush(u1 *addr, s4 nbytes)
+{
+ /* do nothing */
+}
+
+
+/* md_patch_replacement_point **************************************************
+
+ Patch the given replacement point.
+
+*******************************************************************************/
+
+void md_patch_replacement_point(rplpoint *rp)
+{
+ u8 mcode;
+
+ /* XXX this is probably unsafe! */
+
+ /* save the current machine code */
+ mcode = *(u8*)rp->pc;
+
+ /* write spinning instruction */
+ *(u2*)(rp->pc) = 0xebfe;
+
+ /* write 5th byte */
+ rp->pc[4] = (rp->mcode >> 32);
+
+ /* write first word */
+ *(u4*)(rp->pc) = (u4) rp->mcode;
+
+ /* store saved mcode */
+ rp->mcode = mcode;
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+ {
+ u1* u1ptr = rp->pc;
+ DISASSINSTR(u1ptr);
+ fflush(stdout);
+ }
+#endif
+
+ /* XXX if required asm_cacheflush(rp->pc,8); */
+}
+
/*
* 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
* c-basic-offset: 4
* tab-width: 4
* End:
+ * vim:noexpandtab:sw=4:ts=4:
*/
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