Authors: Andreas Krall
Reinhard Grafl
-
- Changes: Joseph Wenninger
+ Joseph Wenninger
Christian Thalinger
+ Edwin Steiner
- $Id: md.c 4650 2006-03-16 21:11:50Z edwin $
+ $Id: md.c 5948 2006-11-11 16:56:48Z twisti $
*/
#include "vm/stringlocal.h"
#include "vm/jit/asmpart.h"
#include "vm/jit/stacktrace.h"
+
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
#include "vm/options.h" /* XXX debug */
#include "vm/jit/disass.h" /* XXX debug */
+#endif
/* global variables ***********************************************************/
}
+/* md_codegen_patch_branch *****************************************************
+
+ Back-patches a branch instruction.
+
+*******************************************************************************/
+
+void md_codegen_patch_branch(codegendata *cd, s4 branchmpc, s4 targetmpc)
+{
+ s4 *mcodeptr;
+ s4 mcode;
+ s4 disp; /* branch displacement */
+
+ /* calculate the patch position */
+
+ mcodeptr = (s4 *) (cd->mcodebase + branchmpc);
+
+ /* get the instruction before the exception point */
+
+ mcode = mcodeptr[-1];
+
+ /* Calculate the branch displacement. For branches we need a
+ displacement relative and shifted to the branch PC. */
+
+ disp = (targetmpc - branchmpc) >> 2;
+
+ /* check branch displacement */
+
+ if ((disp < (s4) 0xffe00000) || (disp > (s4) 0x001fffff))
+ vm_abort("branch displacement is out of range: %d > +/-%d", disp, 0x001fffff);
+
+ /* patch the branch instruction before the mcodeptr */
+
+ mcodeptr[-1] |= (disp & 0x001fffff);
+}
+
+
/* md_stacktrace_get_returnaddress *********************************************
Returns the return address of the current stackframe, specified by
}
-/* md_assembler_get_patch_address **********************************************
+/* 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).
- Machine code:
+ INVOKESTATIC/SPECIAL:
a77bffb8 ldq pv,-72(pv)
6b5b4000 jsr (pv)
- or
+ INVOKEVIRTUAL:
+ a7900000 ldq at,0(a0)
a77c0000 ldq pv,0(at)
6b5b4000 jsr (pv)
+ INVOKEINTERFACE:
+
+ a7900000 ldq at,0(a0)
+ a79cff98 ldq at,-104(at)
+ a77c0018 ldq pv,24(at)
+ 6b5b4000 jsr (pv)
+
*******************************************************************************/
-u1 *md_assembler_get_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
+u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
{
u4 mcode;
s4 offset;
}
-/* md_codegen_findmethod *******************************************************
+/* md_codegen_get_pv_from_pc ***************************************************
Machine code:
*******************************************************************************/
-u1 *md_codegen_findmethod(u1 *ra)
+u1 *md_codegen_get_pv_from_pc(u1 *ra)
{
u1 *pv;
u4 mcode;
offset = (s2) (mcode & 0x0000ffff);
pv += offset;
-
- } else {
+ }
+ else {
/* get displacement of first instruction (lda) */
assert((mcode >> 16) == 0x237a);
/* store saved mcode */
rp->mcode = mcode;
+#if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
{
u1* u1ptr = rp->pc;
DISASSINSTR(u1ptr);
fflush(stdout);
}
+#endif
/* flush instruction cache */
md_icacheflush(rp->pc,4);