/* src/vm/jit/mips/md.c - machine dependent MIPS 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.
-
- Contact: cacao@complang.tuwien.ac.at
-
- Authors: Christian Thalinger
-
- Changes:
-
- $Id: md.c 3323 2005-10-04 18:33:30Z twisti $
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA.
*/
+#include "config.h"
+
#include <assert.h>
-#include <sys/mman.h>
#include <unistd.h>
+#include <sys/cachectl.h>
-#include "config.h"
#include "vm/types.h"
+#include "toolbox/logging.h"
+
#include "vm/global.h"
+#include "vm/vm.h"
+#include "vm/jit/codegen-common.h" /* REMOVEME: only for codegendata */
+#include "vm/jit/stacktrace.h"
-void docacheflush(u1 *p, long bytelen)
-{
- u1 *e = p + bytelen;
- long psize = sysconf(_SC_PAGESIZE);
- p -= (long) p & (psize - 1);
- e += psize - ((((long) e - 1) & (psize - 1)) + 1);
- bytelen = e-p;
- mprotect(p, bytelen, PROT_READ | PROT_WRITE | PROT_EXEC);
-}
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+#include "vmcore/options.h" /* XXX debug */
+#include "vm/jit/disass.h" /* XXX debug */
+#endif
/* md_stacktrace_get_returnaddress *********************************************
*******************************************************************************/
-functionptr md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
+u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
{
- functionptr ra;
+ u1 *ra;
/* on MIPS the return address is located on the top of the stackframe */
- ra = (functionptr) *((u1 **) (sp + framesize - SIZEOF_VOID_P));
+ /* XXX change this if we ever want to use 4-byte stackslots */
+ /* ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P)); */
+ ra = *((u1 **) (sp + framesize - 8));
return ra;
}
-/* 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:
+
+ dfdeffb8 ld s8,-72(s8)
+ 03c0f809 jalr s8
+ 00000000 nop
+
+ INVOKEVIRTUAL:
+
+ dc990000 ld t9,0(a0)
+ df3e0000 ld s8,0(t9)
+ 03c0f809 jalr s8
+ 00000000 nop
+
+ INVOKEINTERFACE:
+
+ dc990000 ld t9,0(a0)
+ df39ff90 ld t9,-112(t9)
+ df3e0018 ld s8,24(t9)
+ 03c0f809 jalr s8
+ 00000000 nop
+
+*******************************************************************************/
+
+u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
+{
+ u4 mcode;
+ s4 offset;
+ u1 *pa;
+
+ /* go back to the actual load instruction (3 instructions on MIPS) */
+
+ ra -= 3 * 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);
+
+ pa = NULL;
+ }
+ else {
+ /* get first instruction (ld) */
+
+ mcode = *((u4 *) ra);
+
+ /* get the offset from the instruction */
+
+ offset = (s2) (mcode & 0x0000ffff);
+
+ /* check for call with REG_METHODPTR: ld s8,x(t9) */
+
+#if SIZEOF_VOID_P == 8
+ if ((mcode >> 16) == 0xdf3e) {
+#else
+ if ((mcode >> 16) == 0x8f3e) {
+#endif
+ /* 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 `ld s8,x(s8)' instruction */
+
+#if SIZEOF_VOID_P == 8
+ assert((mcode >> 16) == 0xdfde);
+#else
+ assert((mcode >> 16) == 0x8fde);
+#endif
+
+ /* and get the final data segment address */
+
+ pa = sfi->pv + offset;
+ }
+ }
+
+ return pa;
+}
+
+
+/* md_codegen_get_pv_from_pc ***************************************************
Machine code:
- 6b5b4000 jsr (pv)
- 237affe8 lda pv,-24(ra)
+ 03c0f809 jalr s8
+ 00000000 nop
+ 27feff9c addiu s8,ra,-100
*******************************************************************************/
-functionptr codegen_findmethod(functionptr pc)
+u1 *md_codegen_get_pv_from_pc(u1 *ra)
{
- u1 *ra;
u1 *pv;
u4 mcode;
s4 offset;
- ra = (u1 *) pc;
- pv = ra;
+ /* get the offset of the instructions */
/* get first instruction word after jump */
mcode = *((u4 *) ra);
- /* check if we have 2 instructions (ldah, lda) */
+ /* check if we have 2 instructions (lui, daddiu) */
if ((mcode >> 16) == 0x3c19) {
/* get displacement of first instruction (lui) */
offset = (s4) (mcode << 16);
- pv += offset;
/* get displacement of second instruction (daddiu) */
mcode = *((u4 *) (ra + 1 * 4));
- if ((mcode >> 16) != 0x6739) {
- log_text("No `daddiu' instruction found on return address!");
- assert(0);
- }
+#if SIZEOF_VOID_P == 8
+ assert((mcode >> 16) == 0x6739);
+#else
+ assert((mcode >> 16) == 0x2739);
+#endif
- offset = (s2) (mcode & 0x0000ffff);
- pv += offset;
-
- } else {
+ offset += (s2) (mcode & 0x0000ffff);
+ }
+ else {
/* get offset of first instruction (daddiu) */
mcode = *((u4 *) ra);
- if ((mcode >> 16) != 0x67fe) {
- log_text("No `daddiu s8,ra,x' instruction found on return address!");
- assert(0);
- }
+#if SIZEOF_VOID_P == 8
+ assert((mcode >> 16) == 0x67fe);
+#else
+ assert((mcode >> 16) == 0x27fe);
+#endif
offset = (s2) (mcode & 0x0000ffff);
- pv += offset;
}
- return (functionptr) pv;
+ /* calculate PV via RA + offset */
+
+ pv = ra + offset;
+
+ return pv;
+}
+
+
+/* md_cacheflush ***************************************************************
+
+ Calls the system's function to flush the instruction and data
+ cache.
+
+*******************************************************************************/
+
+void md_cacheflush(u1 *addr, s4 nbytes)
+{
+ cacheflush(addr, nbytes, BCACHE);
}
+/* md_icacheflush **************************************************************
+
+ Calls the system's function to flush the instruction cache.
+
+*******************************************************************************/
+
+void md_icacheflush(u1 *addr, s4 nbytes)
+{
+ cacheflush(addr, nbytes, ICACHE);
+}
+
+
+/* md_dcacheflush **************************************************************
+
+ Calls the system's function to flush the data cache.
+
+*******************************************************************************/
+
+void md_dcacheflush(u1 *addr, s4 nbytes)
+{
+ cacheflush(addr, nbytes, DCACHE);
+}
+
+
+/* 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)
+{
+ union {
+ u8 both;
+ u4 words[2];
+ } mcode;
+
+ if (index < 0) {
+ /* restore the patched-over instruction */
+ *(u8*)(rp->pc) = *(u8*)(savedmcode);
+ }
+ else {
+ /* save the current machine code */
+ *(u8*)(savedmcode) = *(u8*)(rp->pc);
+
+ /* build the machine code for the patch */
+ assert(0); /* XXX build trap instruction below */
+ mcode.both = 0;
+
+ /* write the new machine code */
+ *(u8*)(rp->pc) = mcode.both;
+ }
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+ {
+ u1* u1ptr = rp->pc;
+ DISASSINSTR(u1ptr);
+ DISASSINSTR(u1ptr);
+ fflush(stdout);
+ }
+#endif
+
+ /* flush instruction cache */
+ md_icacheflush(rp->pc,2*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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