/* src/vm/jit/alpha/md.c - machine dependent Alpha 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: Andreas Krall
Reinhard Grafl
Changes: Joseph Wenninger
Christian Thalinger
+ Edwin Steiner
- $Id: md.c 3039 2005-07-13 19:04:25Z twisti $
+ $Id: md.c 4673 2006-03-22 15:30:06Z edwin $
*/
+#include "config.h"
+
#include <assert.h>
#include <ucontext.h>
-#include "config.h"
+#if defined(__LINUX__)
+# include <asm/fpu.h>
+
+extern unsigned long ieee_get_fp_control();
+extern void ieee_set_fp_control(unsigned long fp_control);
+#endif
+
+#include "vm/types.h"
#include "vm/jit/alpha/md-abi.h"
-#include "vm/jit/alpha/types.h"
#include "vm/exceptions.h"
#include "vm/stringlocal.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
+
+
+/* global variables ***********************************************************/
+
+bool has_ext_instr_set = false; /* has instruction set extensions */
+
/* md_init *********************************************************************
void md_init(void)
{
-#if 0
- /* XXX TWISTI: do we really need this? fptest's seem to work fine */
-
-#if defined(__LINUX__)
-/* Linux on Digital Alpha needs an initialisation of the ieee floating point
- control for IEEE compliant arithmetic (option -mieee of GCC). Under
- Digital Unix this is done automatically.
-*/
+ /* check for extended instruction set */
-#include <asm/fpu.h>
+ has_ext_instr_set = !asm_md_init();
-extern unsigned long ieee_get_fp_control();
-extern void ieee_set_fp_control(unsigned long fp_control);
+#if defined(__LINUX__)
+ /* Linux on Digital Alpha needs an initialisation of the ieee
+ floating point control for IEEE compliant arithmetic (option
+ -mieee of GCC). Under Digital Unix this is done
+ automatically. */
/* initialize floating point control */
/* & ~IEEE_TRAP_ENABLE_UNF we dont want underflow */
& ~IEEE_TRAP_ENABLE_OVF);
#endif
-#endif
-
- /* nothing to do */
}
-/* signal_handler_sigsegv ******************************************************
+/* md_stacktrace_get_returnaddress *********************************************
- NullPointerException signal handler for hardware null pointer check.
+ Returns the return address of the current stackframe, specified by
+ the passed stack pointer and the stack frame size.
*******************************************************************************/
-void signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
+u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
{
- ucontext_t *_uc;
- mcontext_t *_mc;
- u4 instr;
- ptrint addr;
- u1 *pv;
- u1 *sp;
- functionptr ra;
- functionptr xpc;
+ u1 *ra;
- _uc = (ucontext_t *) _p;
- _mc = &_uc->uc_mcontext;
+ /* on Alpha the return address is located on the top of the stackframe */
- instr = *((s4 *) (_mc->sc_pc));
- addr = _mc->sc_regs[(instr >> 16) & 0x1f];
+ ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P));
- if (addr == 0) {
- pv = (u1 *) _mc->sc_regs[REG_PV];
- sp = (u1 *) _mc->sc_regs[REG_SP];
- ra = (functionptr) _mc->sc_regs[REG_RA]; /* this is correct for leafs*/
- xpc = (functionptr) _mc->sc_pc;
+ return ra;
+}
- _mc->sc_regs[REG_ITMP1_XPTR] =
- (ptrint) stacktrace_hardware_nullpointerexception(pv, sp, ra, xpc);
- _mc->sc_regs[REG_ITMP2_XPC] = (ptrint) xpc;
- _mc->sc_pc = (ptrint) asm_handle_exception;
+/* md_assembler_get_patch_address **********************************************
- } else {
- addr += (long) ((instr << 16) >> 16);
+ 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).
- throw_cacao_exception_exit(string_java_lang_InternalError,
- "Segmentation fault: 0x%016lx at 0x%016lx\n",
- addr, _mc->sc_pc);
- }
-}
+ Machine code:
+ a77bffb8 ldq pv,-72(pv)
+ 6b5b4000 jsr (pv)
+
+ or
+
+ a77c0000 ldq pv,0(at)
+ 6b5b4000 jsr (pv)
+
+*******************************************************************************/
-#if defined(USE_THREADS) && defined(NATIVE_THREADS)
-void thread_restartcriticalsection(ucontext_t *uc)
+u1 *md_assembler_get_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
{
- void *critical;
+ u4 mcode;
+ s4 offset;
+ u1 *pa; /* patch address */
- critical = thread_checkcritical((void *) uc->uc_mcontext.sc_pc);
+ /* go back to the actual load instruction (2 instructions on Alpha) */
- if (critical)
- uc->uc_mcontext.sc_pc = (ptrint) critical;
-}
-#endif
+ ra = ra - 2 * 4;
+ /* get first instruction word on current PC */
-/* md_stacktrace_get_returnaddress *********************************************
+ mcode = *((u4 *) ra);
- Returns the return address of the current stackframe, specified by
- the passed stack pointer and the stack frame size.
+ /* check if we have 2 instructions (lui) */
-*******************************************************************************/
+ if ((mcode >> 16) == 0x3c19) {
+ /* XXX write a regression for this */
+ assert(0);
-functionptr md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
-{
- functionptr ra;
+ /* get displacement of first instruction (lui) */
- /* on Alpha the return address is located on the top of the stackframe */
+ offset = (s4) (mcode << 16);
- ra = (functionptr) *((u1 **) (sp + framesize - SIZEOF_VOID_P));
+ /* get displacement of second instruction (daddiu) */
- return ra;
+ mcode = *((u4 *) (ra + 1 * 4));
+
+ assert((mcode >> 16) == 0x6739);
+
+ offset += (s2) (mcode & 0x0000ffff);
+
+ } else {
+ /* get first instruction (ldq) */
+
+ mcode = *((u4 *) ra);
+
+ /* get the offset from the instruction */
+
+ offset = (s2) (mcode & 0x0000ffff);
+
+ /* check for call with REG_METHODPTR: ldq pv,0(at) */
+
+ if ((mcode >> 16) == 0xa77c) {
+ /* in this case we use the passed method pointer */
+
+ pa = mptr + offset;
+
+ } else {
+ /* in the normal case we check for a `ldq pv,-72(pv)' instruction */
+
+ assert((mcode >> 16) == 0xa77b);
+
+ /* and get the final data segment address */
+
+ pa = sfi->pv + offset;
+ }
+ }
+
+ return pa;
}
-/* codegen_findmethod **********************************************************
+/* md_codegen_findmethod *******************************************************
Machine code:
6b5b4000 jsr (pv)
- 237affe8 lda pv,-24(ra)
+ 277afffe ldah pv,-2(ra)
+ 237ba61c lda pv,-23012(pv)
*******************************************************************************/
-functionptr codegen_findmethod(functionptr pc)
+u1 *md_codegen_findmethod(u1 *ra)
{
- u1 *ra;
u1 *pv;
u4 mcode;
- s2 offset;
+ s4 offset;
- ra = (u1 *) pc;
pv = ra;
- /* get offset of first instruction (lda) */
+ /* get first instruction word after jump */
mcode = *((u4 *) ra);
- if ((mcode >> 16) != 0x237a) {
- log_text("No `lda pv,x(ra)' instruction found on return address!");
- assert(0);
- }
+ /* check if we have 2 instructions (ldah, lda) */
+
+ if ((mcode >> 16) == 0x277a) {
+ /* get displacement of first instruction (ldah) */
- offset = (s2) (mcode & 0x0000ffff);
- pv += offset;
+ offset = (s4) (mcode << 16);
+ pv += offset;
- /* check for second instruction (ldah) */
+ /* get displacement of second instruction (lda) */
+
+ mcode = *((u4 *) (ra + 1 * 4));
+
+ assert((mcode >> 16) == 0x237b);
+
+ offset = (s2) (mcode & 0x0000ffff);
+ pv += offset;
+
+ } else {
+ /* get displacement of first instruction (lda) */
- mcode = *((u4 *) (ra + 1 * 4));
+ assert((mcode >> 16) == 0x237a);
- if ((mcode >> 16) == 0x177b) {
- offset = (s2) (mcode << 16);
+ offset = (s2) (mcode & 0x0000ffff);
pv += offset;
}
- return (functionptr) pv;
+ return pv;
}
+/* md_cacheflush ***************************************************************
+
+ Calls the system's function to flush the instruction and data
+ cache.
+
+*******************************************************************************/
+
+void md_cacheflush(u1 *addr, s4 nbytes)
+{
+ asm_cacheflush(addr, nbytes);
+}
+
+
+/* md_icacheflush **************************************************************
+
+ Calls the system's function to flush the instruction cache.
+
+*******************************************************************************/
+
+void md_icacheflush(u1 *addr, s4 nbytes)
+{
+ asm_cacheflush(addr, nbytes);
+}
+
+
+/* md_patch_replacement_point **************************************************
+
+ Patch the given replacement point.
+
+*******************************************************************************/
+
+void md_patch_replacement_point(rplpoint *rp)
+{
+ u8 mcode;
+
+ /* save the current machine code */
+ mcode = *(u4*)rp->pc;
+
+ /* write the new machine code */
+ *(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
+
+ /* flush instruction cache */
+ md_icacheflush(rp->pc,4);
+}
+
/*
* 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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