/* src/vm/jit/i386/md.c - machine dependent i386 functions
- Copyright (C) 1996-2005, 2006 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, 2008
+ CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
This file is part of CACAO.
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- Contact: cacao@cacaojvm.org
-
- Authors: Christian Thalinger
-
- Changes: Edwin Steiner
-
- $Id: md.c 4613 2006-03-15 12:04:05Z edwin $
-
*/
#include "config.h"
-#include "vm/types.h"
#include <assert.h>
+#include <stdint.h>
+
+#include "vm/types.h"
#include "vm/global.h"
+#include "vm/vm.hpp"
+
#include "vm/jit/asmpart.h"
-#include "vm/jit/codegen-common.h"
-#include "vm/options.h" /* XXX debug */
-#include "vm/jit/disass.h" /* XXX debug */
+#include "vm/jit/jit.hpp"
/* md_init *********************************************************************
}
-/* md_stacktrace_get_returnaddress *********************************************
+/* md_jit_method_patch_address *************************************************
- Returns the return address of the current stackframe, specified by
- the passed stack pointer and the stack frame size.
+ 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:
+
+ 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_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
+void *md_jit_method_patch_address(void *pv, void *ra, void *mptr)
{
- u1 *ra;
+ uint8_t *pc;
+ uint16_t opcode;
+ int32_t disp;
+ void *pa; /* patch address */
- /* on i386 the return address is above the current stack frame */
+ /* go back to the actual call instruction (2-bytes) */
- ra = *((u1 **) (sp + framesize));
+ pc = ((uint8_t *) ra) - 2;
- return ra;
-}
+ /* Get the opcode of the call. */
+ opcode = *((uint16_t *) pc);
-/* md_codegen_findmethod *******************************************************
+ /* check for the different calls */
- On this architecture just a wrapper function to codegen_findmethod.
+ switch (opcode) {
+ case 0xd1ff:
+ /* INVOKESTATIC/SPECIAL */
-*******************************************************************************/
+ /* Patch address is 4-bytes before the call instruction. */
-u1 *md_codegen_findmethod(u1 *ra)
-{
- u1 *pv;
+ pa = pc - 4;
+ break;
+
+ case 0xd2ff:
+ /* INVOKEVIRTUAL/INTERFACE */
+
+ /* Return NULL if no mptr was specified (used for
+ replacement). */
- /* the the start address of the function which contains this
- address from the method table */
+ if (mptr == NULL)
+ return NULL;
- pv = codegen_findmethod(ra);
+ /* Get the displacement from the instruction (the displacement
+ address is 4-bytes before the call instruction). */
- return pv;
+ disp = *((int32_t *) (pc - 4));
+
+ /* Add the displacement to the method pointer. */
+
+ pa = ((uint8_t *) mptr) + disp;
+ break;
+
+ default:
+ vm_abort_disassemble(pc, 1, "md_jit_method_patch_address: unknown instruction %x", opcode);
+ return NULL;
+ }
+
+ return pa;
}
+
/* md_patch_replacement_point **************************************************
Patch the given replacement point.
*******************************************************************************/
-void md_patch_replacement_point(rplpoint *rp)
+#if defined(ENABLE_REPLACEMENT)
+void md_patch_replacement_point(u1 *pc, u1 *savedmcode, bool revert)
{
- u8 mcode;
-
- /* XXX this is probably unsafe! */
-
- /* save the current machine code */
- mcode = *(u8*)rp->pc;
+ u2 mcode;
- /* write spinning instruction */
- *(u2*)(rp->pc) = 0xebfe;
-
- /* write 5th byte */
- rp->pc[4] = (rp->mcode >> 32);
+ if (revert) {
+ /* write saved machine code */
+ *(u2*)(pc) = *(u2*)(savedmcode);
+ }
+ else {
+ /* save the current machine code */
+ *(u2*)(savedmcode) = *(u2*)(pc);
- /* write first word */
- *(u4*)(rp->pc) = (u4) rp->mcode;
+ /* build the machine code for the patch */
+ mcode = 0x0b0f;
- /* store saved mcode */
- rp->mcode = mcode;
-
- {
- u1* u1ptr = rp->pc;
- DISASSINSTR(u1ptr);
- fflush(stdout);
+ /* write new machine code */
+ *(u2*)(pc) = mcode;
}
-
- /* XXX if required asm_cacheflush(rp->pc,8); */
+
+ /* XXX if required asm_cacheflush(pc,8); */
}
+#endif /* defined(ENABLE_REPLACEMENT) */
/*
* These are local overrides for various environment variables in Emacs.
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