/* 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, 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: Andreas Krall
- Reinhard Grafl
-
- Changes: Joseph Wenninger
- Christian Thalinger
-
- $Id: md.c 3772 2005-11-23 21:36:35Z twisti $
+ $Id: md.c 7596 2007-03-28 21:05:53Z twisti $
*/
+#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/exceptions.h"
#include "vm/stringlocal.h"
+
#include "vm/jit/asmpart.h"
#include "vm/jit/stacktrace.h"
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+#include "vmcore/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)
{
- /* XXX TWISTI: do we really need this? fptest's seem to work fine */
+ /* check for extended instruction set */
-#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.
-*/
-
-#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
-
- /* nothing to do */
}
}
-/* 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:
+
+ a77bffb8 ldq pv,-72(pv)
+ 6b5b4000 jsr (pv)
+
+ INVOKEVIRTUAL:
+
+ a7900000 ldq at,0(a0)
+ a77c0000 ldq pv,0(at)
+ 6b5b4000 jsr (pv)
+
+ INVOKEINTERFACE:
+
+ a7900000 ldq at,0(a0)
+ a79cff98 ldq at,-104(at)
+ a77c0018 ldq pv,24(at)
+ 6b5b4000 jsr (pv)
+
+*******************************************************************************/
+
+u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
+{
+ u4 mcode;
+ s4 offset;
+ u1 *pa; /* patch address */
+
+ /* go back to the actual load instruction (2 instructions on Alpha) */
+
+ ra = ra - 2 * 4;
+
+ /* get first instruction word on current PC */
+
+ mcode = *((u4 *) ra);
+
+ /* check if we have 2 instructions (lui) */
+
+ if ((mcode >> 16) == 0x3c19) {
+ /* XXX write a regression for this */
+ assert(0);
+
+ /* get displacement of first instruction (lui) */
+
+ offset = (s4) (mcode << 16);
+
+ /* get displacement of second instruction (daddiu) */
+
+ 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 */
+
+ /* return NULL if no mptr was specified (used for replacement) */
+
+ if (mptr == NULL)
+ return NULL;
+
+ 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;
+}
+
+
+/* md_codegen_get_pv_from_pc ***************************************************
Machine code:
*******************************************************************************/
-u1 *md_codegen_findmethod(u1 *ra)
+u1 *md_codegen_get_pv_from_pc(u1 *ra)
{
u1 *pv;
u4 mcode;
mcode = *((u4 *) (ra + 1 * 4));
- if ((mcode >> 16) != 0x237b) {
- log_text("No `lda pv,x(pv)' instruction found on return address!");
- assert(0);
- }
+ assert((mcode >> 16) == 0x237b);
offset = (s2) (mcode & 0x0000ffff);
pv += offset;
-
- } else {
+ }
+ else {
/* get displacement of first instruction (lda) */
- if ((mcode >> 16) != 0x237a) {
- log_text("No `lda pv,x(ra)' instruction found on return address!");
- assert(0);
- }
+ assert((mcode >> 16) == 0x237a);
offset = (s2) (mcode & 0x0000ffff);
pv += offset;
}
+/* 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.
+
+*******************************************************************************/
+
+#if defined(ENABLE_REPLACEMENT)
+void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
+{
+ s4 disp;
+ u4 mcode;
+
+ if (index < 0) {
+ /* restore the patched-over instruction */
+ *(u4*)(rp->pc) = *(u4*)(savedmcode);
+ }
+ else {
+ /* save the current machine code */
+ *(u4*)(savedmcode) = *(u4*)(rp->pc);
+
+ /* build the machine code for the patch */
+ disp = ((u4*)code->replacementstubs - (u4*)rp->pc)
+ + index * REPLACEMENT_STUB_SIZE
+ - 1;
+
+ /* BR */
+ mcode = (((s4) (0x30)) << 26) | ((REG_ZERO) << 21) | ((disp) & 0x1fffff);
+
+ /* write the new machine code */
+ *(u4*)(rp->pc) = mcode;
+ }
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0
+ {
+ u1* u1ptr = rp->pc;
+ DISASSINSTR(u1ptr);
+ fflush(stdout);
+ }
+#endif
+
+ /* flush instruction cache */
+ md_icacheflush(rp->pc,4);
+}
+#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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