/* src/vm/jit/powerpc/md.c - machine dependent PowerPC functions
- Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
+ 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
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- Contact: cacao@cacaojvm.org
-
- Authors: Christian Thalinger
+*/
- Changes:
- $Id: md.c 4357 2006-01-22 23:33:38Z twisti $
+#include "config.h"
-*/
+#include <assert.h>
+#include <stdint.h>
-#include "config.h"
#include "vm/types.h"
#include "md-abi.h"
+#include "vm/jit/powerpc/codegen.h"
#include "vm/global.h"
+#include "vm/vm.h"
+
+#include "vm/jit/asmpart.h"
+#include "vm/jit/codegen-common.h"
+#include "vm/jit/jit.h"
+#include "vm/jit/md.h"
/* md_init *********************************************************************
}
-/* md_codegen_findmethod *******************************************************
+/* md_jit_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
+
+*******************************************************************************/
+
+void *md_jit_method_patch_address(void *pv, void *ra, void *mptr)
+{
+ uint32_t *pc;
+ uint32_t mcode;
+ int32_t offset;
+ void *pa;
+
+ /* go back to the actual load instruction (3 instructions) */
+
+ pc = ((uint32_t *) ra) - 3;
+
+ /* get first instruction word (lwz) */
+
+ mcode = *pc;
+
+ /* 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 = (int32_t) (mcode << 16);
+
+ /* get displacement of second instruction (addi) */
+
+ mcode = *(pc + 1);
+
+ assert((mcode >> 16) != 0x6739);
+
+ offset += (int16_t) (mcode & 0x0000ffff);
+ }
+ else {
+ /* get the offset from the instruction */
+
+ offset = (int16_t) (mcode & 0x0000ffff);
+
+ /* check for load from PV */
+
+ if ((mcode >> 16) == 0x81ad) {
+ /* get the final data segment address */
+
+ pa = ((uint8_t *) 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 = ((uint8_t *) mptr) + offset;
+ }
+ else {
+ /* catch any problems */
+
+ vm_abort("md_jit_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 *md_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(u1 *pc, u1 *savedmcode, bool revert)
+{
+ u4 mcode;
+
+ if (revert) {
+ /* restore the patched-over instruction */
+ *(u4*)(pc) = *(u4*)(savedmcode);
+ }
+ else {
+ /* save the current machine code */
+ *(u4*)(savedmcode) = *(u4*)(pc);
+
+ /* build the machine code for the patch */
+ assert(0); /* XXX build trap instruction below */
+ mcode = 0;
+
+ /* write the new machine code */
+ *(u4*)(pc) = (u4) mcode;
+ }
+
+ /* flush instruction cache */
+ md_icacheflush(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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