/* src/vm/jit/powerpc/md.c - machine dependent PowerPC 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 2922 2005-07-07 09:27:20Z twisti $
+#include "config.h"
-*/
+#include <assert.h>
+#include "vm/types.h"
-#include "vm/jit/powerpc/types.h"
-#include "vm/jit/powerpc/linux/md-abi.h"
+#include "md-abi.h"
+#include "vm/jit/powerpc/codegen.h"
#include "vm/global.h"
+#include "vm/jit/asmpart.h"
+#include "vm/jit/stacktrace.h"
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
+# include "vm/jit/disass.h" /* XXX debug */
+# include "vmcore/options.h" /* XXX debug */
+#endif
+
/* md_init *********************************************************************
*******************************************************************************/
-functionptr md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
+u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
{
- functionptr ra;
+ u1 *ra;
/* on PowerPC the return address is located in the linkage area */
- ra = (functionptr) *((u1 **) (sp + framesize + LA_LR_OFFSET));
+ ra = *((u1 **) (sp + framesize + LA_LR_OFFSET));
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:
+
+ 81adffd4 lwz r13,-44(r13)
+ 7da903a6 mtctr r13
+ 4e800421 bctrl
+
+ INVOKEVIRTUAL:
+
+ 81830000 lwz r12,0(r3)
+ 81ac0000 lwz r13,0(r12)
+ 7da903a6 mtctr r13
+ 4e800421 bctrl
+
+ INVOKEINTERFACE:
+
+ 81830000 lwz r12,0(r3)
+ 818c0000 lwz r12,0(r12)
+ 81ac0000 lwz r13,0(r12)
+ 7da903a6 mtctr r13
+ 4e800421 bctrl
+
+*******************************************************************************/
+
+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) */
+
+ ra = ra - 3 * 4;
+
+ /* get first instruction word (lwz) */
+
+ mcode = *((u4 *) ra);
+
+ /* check if we have 2 instructions (addis, addi) */
+
+ if ((mcode >> 16) == 0x3c19) {
+ /* XXX write a regression for this */
+ pa = NULL;
+ assert(0);
+
+ /* get displacement of first instruction (addis) */
+
+ offset = (s4) (mcode << 16);
+
+ /* get displacement of second instruction (addi) */
+
+ mcode = *((u4 *) (ra + 1 * 4));
+
+ assert((mcode >> 16) != 0x6739);
+
+ offset += (s2) (mcode & 0x0000ffff);
+ }
+ else {
+ /* get the offset from the instruction */
+
+ offset = (s2) (mcode & 0x0000ffff);
+
+ /* check for load from PV */
+
+ if ((mcode >> 16) == 0x81ad) {
+ /* get the final data segment address */
+
+ pa = sfi->pv + offset;
+ }
+ else if ((mcode >> 16) == 0x81ac) {
+ /* 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 {
+ /* catch any problems */
+
+ vm_abort("md_get_method_patch_address: unknown instruction %x",
+ mcode);
+
+ /* keep compiler happy */
+
+ pa = NULL;
+ }
+ }
+
+ return pa;
+}
+
+
+/* md_codegen_get_pv_from_pc ***************************************************
Machine code:
- 7d6802a6 mflr r11
- 39abffe0 addi r13,r11,-32
+ 7d6802a6 mflr r11
+ 39abffe0 addi r13,r11,-32
+
+ or
+
+ 7d6802a6 mflr r11
+ 3dabffff addis r13,r11,-1
+ 39ad68b0 addi r13,r13,26800
*******************************************************************************/
-u1 *codegen_findmethod(u1 *ra)
+u1 *md_codegen_get_pv_from_pc(u1 *ra)
{
u1 *pv;
u4 mcode;
- s2 offset;
-
- pv = ra;
+ s4 offset;
- /* get offset of first instruction (addi) */
+ /* get first instruction word after jump */
mcode = *((u4 *) (ra + 1 * 4));
- offset = (s2) (mcode & 0x0000ffff);
- pv += offset;
- /* check for second instruction (addis) */
+ /* check if we have 2 instructions (addis, addi) */
- mcode = *((u4 *) (ra + 2 * 4));
+ if ((mcode >> 16) == 0x3dab) {
+ /* get displacement of first instruction (addis) */
- if ((mcode >> 16) == 0x3dad) {
- offset = (s2) (mcode << 16);
- pv += offset;
+ offset = (s4) (mcode << 16);
+
+ /* get displacement of second instruction (addi) */
+
+ mcode = *((u4 *) (ra + 2 * 4));
+
+ /* check for addi instruction */
+
+ assert((mcode >> 16) == 0x39ad);
+
+ offset += (s2) (mcode & 0x0000ffff);
+
+ } else {
+ /* check for addi instruction */
+
+ assert((mcode >> 16) == 0x39ab);
+
+ /* get offset of first instruction (addi) */
+
+ offset = (s2) (mcode & 0x0000ffff);
}
+ /* 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)
+{
+ 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_dcacheflush **************************************************************
+
+ Calls the system's function to flush the data cache.
+
+*******************************************************************************/
+
+void md_dcacheflush(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)
+{
+ 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 */
+ assert(0); /* XXX build trap instruction below */
+ mcode = 0;
+
+ /* write the new machine code */
+ *(u4*)(rp->pc) = (u4) 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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