/* 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
- Edwin Steiner
-
- $Id: md.c 6265 2007-01-02 20:40:57Z edwin $
-
*/
#include "config.h"
#include <assert.h>
+#include <stdint.h>
#include "vm/types.h"
#include "vm/global.h"
-#include "vm/jit/asmpart.h"
-#include "vm/jit/codegen-common.h"
+#include "vm/vm.hpp"
-#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
-#include "vm/options.h" /* XXX debug */
-#include "vm/jit/disass.h" /* XXX debug */
-#endif
+#include "vm/jit/asmpart.h"
+#include "vm/jit/jit.hpp"
/* md_init *********************************************************************
}
-/* md_codegen_patch_branch *****************************************************
-
- Back-patches a branch instruction.
-
-*******************************************************************************/
-
-void md_codegen_patch_branch(codegendata *cd, s4 branchmpc, s4 targetmpc)
-{
- s4 *mcodeptr;
- s4 disp; /* branch displacement */
-
- /* calculate the patch position */
-
- mcodeptr = (s4 *) (cd->mcodebase + branchmpc);
-
- /* Calculate the branch displacement. */
-
- disp = targetmpc - branchmpc;
-
- /* I don't think we have to check for branch-displacement
- overflow, +/-2GB should be enough. */
-
- /* patch the branch instruction before the mcodeptr */
-
- mcodeptr[-1] = disp;
-}
-
-
-/* md_stacktrace_get_returnaddress *********************************************
-
- Returns the return address of the current stackframe, specified by
- the passed stack pointer and the stack frame size.
-
-*******************************************************************************/
-
-u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
-{
- u1 *ra;
-
- /* on i386 the return address is above the current stack frame */
-
- ra = *((u1 **) (sp + framesize));
-
- return ra;
-}
-
-
-/* md_get_method_patch_address *************************************************
+/* 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
*******************************************************************************/
-u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
+void *md_jit_method_patch_address(void *pv, void *ra, void *mptr)
{
- u1 mcode;
- s4 offset;
- u1 *pa; /* patch address */
+ uint8_t *pc;
+ uint16_t opcode;
+ int32_t disp;
+ void *pa; /* patch address */
/* go back to the actual call instruction (2-bytes) */
- ra = ra - 2;
+ pc = ((uint8_t *) ra) - 2;
- /* get the last byte of the call */
+ /* Get the opcode of the call. */
- mcode = ra[1];
+ opcode = *((uint16_t *) pc);
/* check for the different calls */
- if (mcode == 0xd1) {
+ switch (opcode) {
+ case 0xd1ff:
/* INVOKESTATIC/SPECIAL */
- /* patch address is 4-bytes before the call instruction */
+ /* Patch address is 4-bytes before the call instruction. */
- pa = ra - 4;
- }
- else if (mcode == 0xd2) {
+ pa = pc - 4;
+ break;
+
+ case 0xd2ff:
/* INVOKEVIRTUAL/INTERFACE */
- /* return NULL if no mptr was specified (used for replacement) */
+ /* Return NULL if no mptr was specified (used for
+ replacement). */
if (mptr == NULL)
return NULL;
- /* Get the offset from the instruction (the offset address is
- 4-bytes before the call instruction). */
+ /* Get the displacement from the instruction (the displacement
+ address is 4-bytes before the call instruction). */
- offset = *((s4 *) (ra - 4));
+ disp = *((int32_t *) (pc - 4));
- /* add the offset to the method pointer */
+ /* Add the displacement to the method pointer. */
- pa = mptr + offset;
- }
- else {
- /* catch any problems */
+ pa = ((uint8_t *) mptr) + disp;
+ break;
- pa = NULL; /* avoid warnings */
-
- vm_abort("couldn't find a proper call instruction sequence");
+ default:
+ vm_abort_disassemble(pc, 1, "md_jit_method_patch_address: unknown instruction %x", opcode);
+ return NULL;
}
return pa;
}
-/* md_codegen_get_pv_from_pc ***************************************************
-
- On this architecture just a wrapper function to
- codegen_get_pv_from_pc.
-
-*******************************************************************************/
-
-u1 *md_codegen_get_pv_from_pc(u1 *ra)
-{
- u1 *pv;
-
- /* Get the start address of the function which contains this
- address from the method table. */
-
- pv = codegen_get_pv_from_pc(ra);
-
- return pv;
-}
-
-
-/* md_cacheflush ***************************************************************
-
- Calls the system's function to flush the instruction and data
- cache.
-
-*******************************************************************************/
-
-void md_cacheflush(u1 *addr, s4 nbytes)
-{
- /* do nothing */
-}
-
-
-/* md_icacheflush **************************************************************
-
- Calls the system's function to flush the instruction cache.
-
-*******************************************************************************/
-
-void md_icacheflush(u1 *addr, s4 nbytes)
-{
- /* do nothing */
-}
-
-
-/* md_dcacheflush **************************************************************
-
- Calls the system's function to flush the data cache.
-
-*******************************************************************************/
-
-void md_dcacheflush(u1 *addr, s4 nbytes)
-{
- /* do nothing */
-}
-
-
/* 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)
+void md_patch_replacement_point(u1 *pc, u1 *savedmcode, bool revert)
{
- s4 disp;
- u8 mcode;
-
- /* XXX this is probably unsafe! */
-
- if (index < 0) {
- /* write spinning instruction */
- *(u2*)(rp->pc) = 0xebfe;
-
- /* write 5th byte */
- rp->pc[4] = savedmcode[4];
+ u2 mcode;
- /* write first word */
- *(u4*)(rp->pc) = *(u4*)(savedmcode);
+ if (revert) {
+ /* write saved machine code */
+ *(u2*)(pc) = *(u2*)(savedmcode);
}
else {
/* save the current machine code */
- *(u4*)(savedmcode) = *(u4*)(rp->pc);
- savedmcode[4] = rp->pc[4];
+ *(u2*)(savedmcode) = *(u2*)(pc);
/* build the machine code for the patch */
- disp = (code->replacementstubs - rp->pc)
- + index * REPLACEMENT_STUB_SIZE
- - 5;
+ mcode = 0x0b0f;
- mcode = 0xe9 | ((u8) disp << 8);
-
- /* write spinning instruction */
- *(u2*)(rp->pc) = 0xebfe;
-
- /* write 5th byte */
- rp->pc[4] = (mcode >> 32);
-
- /* write first word */
- *(u4*)(rp->pc) = (u4) mcode;
+ /* write new machine code */
+ *(u2*)(pc) = mcode;
}
-#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0
- {
- u1* u1ptr = rp->pc;
- DISASSINSTR(u1ptr);
- fflush(stdout);
- }
-#endif
-
- /* XXX if required asm_cacheflush(rp->pc,8); */
+ /* XXX if required asm_cacheflush(pc,8); */
}
#endif /* defined(ENABLE_REPLACEMENT) */
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