/* src/vm/jit/i386/md.c - machine dependent i386 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, 2007 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
-
- Authors: Christian Thalinger
-
- Changes:
-
- $Id: md.c 4029 2006-01-01 18:20:00Z twisti $
+ $Id: md.c 7571 2007-03-24 22:37:09Z twisti $
*/
#include "config.h"
+
+#include <assert.h>
+
#include "vm/types.h"
#include "vm/global.h"
+
+#include "vm/jit/asmpart.h"
#include "vm/jit/codegen-common.h"
+#include "vm/jit/md.h"
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+#include "vmcore/options.h" /* XXX debug */
+#include "vm/jit/disass.h" /* XXX debug */
+#endif
/* md_init *********************************************************************
void md_init(void)
{
- /* nothing to do */
+ (void) asm_md_init();
}
}
-/* md_codegen_findmethod *******************************************************
+/* 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:
- On this architecture just a wrapper function to codegen_findmethod.
+ b9 30 00 49 b7 mov $0xb7490030,%ecx
+ ff d1 call *%ecx
+
+ INVOKEVIRTUAL:
+
+ 8b 08 mov (%eax),%ecx
+ 8b 91 00 00 00 00 mov 0x0(%ecx),%edx
+ ff d2 call *%edx
+
+ INVOKEINTERFACE:
+
+ 8b 08 mov (%eax),%ecx
+ 8b 89 00 00 00 00 mov 0x0(%ecx),%ecx
+ 8b 91 00 00 00 00 mov 0x0(%ecx),%edx
+ ff d2 call *%edx
*******************************************************************************/
-u1 *md_codegen_findmethod(u1 *ra)
+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 (2-bytes) */
+
+ ra = ra - 2;
+
+ /* get the last byte of the call */
+
+ mcode = ra[1];
+
+ /* check for the different calls */
+
+ if (mcode == 0xd1) {
+ /* INVOKESTATIC/SPECIAL */
+
+ /* patch address is 4-bytes before the call instruction */
+
+ pa = ra - 4;
+ }
+ else if (mcode == 0xd2) {
+ /* INVOKEVIRTUAL/INTERFACE */
+
+ /* return NULL if no mptr was specified (used for replacement) */
+
+ if (mptr == NULL)
+ return NULL;
+
+ /* 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 method pointer */
+
+ pa = mptr + offset;
+ }
+ else {
+ /* catch any problems */
+
+ pa = NULL; /* avoid warnings */
+
+ vm_abort("couldn't find a proper call instruction sequence");
+ }
+
+ return pa;
+}
+
+
+/* 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)
{
u1 *pv;
- /* the the start address of the function which contains this
- address from the method table */
+ /* Get the start address of the function which contains this
+ address from the method table. */
- pv = codegen_findmethod(ra);
+ pv = codegen_get_pv_from_pc(ra);
return pv;
}
+/* 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.
+
+*******************************************************************************/
+
+#if defined(ENABLE_REPLACEMENT)
+void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
+{
+ s4 disp;
+ u8 mcode;
+
+ /* XXX this is probably unsafe! */
+
+ if (index < 0) {
+ /* write spinning instruction */
+ *(u2*)(rp->pc) = 0xebfe;
+
+ /* write 5th byte */
+ rp->pc[4] = savedmcode[4];
+
+ /* write first word */
+ *(u4*)(rp->pc) = *(u4*)(savedmcode);
+ }
+ else {
+ /* save the current machine code */
+ *(u4*)(savedmcode) = *(u4*)(rp->pc);
+ savedmcode[4] = rp->pc[4];
+
+ /* build the machine code for the patch */
+ disp = (code->replacementstubs - rp->pc)
+ + index * REPLACEMENT_STUB_SIZE
+ - 5;
+
+ mcode = 0xe9 | ((u8) disp << 8);
+
+ /* write spinning instruction */
+ *(u2*)(rp->pc) = 0xebfe;
+
+ /* write 5th byte */
+ rp->pc[4] = (mcode >> 32);
+
+ /* write first word */
+ *(u4*)(rp->pc) = (u4) mcode;
+ }
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0
+ {
+ u1* u1ptr = rp->pc;
+ DISASSINSTR(u1ptr);
+ fflush(stdout);
+ }
+#endif
+
+ /* XXX if required asm_cacheflush(rp->pc,8); */
+}
+#endif /* defined(ENABLE_REPLACEMENT) */
+
/*
* 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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