Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: patcher.c 7251 2007-01-29 20:24:53Z twisti $
-
*/
#include "vm/initialize.h"
#include "vm/jit/asmpart.h"
-#include "vm/jit/patcher.h"
+#include "vm/jit/patcher-common.h"
#include "vm/jit/md.h"
#include "vm/jit/methodheader.h"
#include "vm/jit/stacktrace.h"
#include "vmcore/field.h"
#include "vmcore/options.h"
#include "vmcore/references.h"
-#include "vmcore/resolve.h"
-
-
-/* patcher_wrapper *************************************************************
-
- Wrapper for all patchers. It also creates the stackframe info
- structure.
-
- If the return value of the patcher function is false, it gets the
- exception object, clears the exception pointer and returns the
- exception.
-
-*******************************************************************************/
-
-java_objectheader *patcher_wrapper(u1 *sp, u1 *pv, u1 *ra)
-{
- stackframeinfo sfi;
- u1 *xpc;
- java_objectheader *o;
- u4 mcode;
- functionptr f;
- bool result;
- java_objectheader *e;
-
- /* define the patcher function */
-
- bool (*patcher_function)(u1 *);
-
- assert(pv != NULL);
-
- /* get stuff from the stack */
-
- xpc = (u1 *) *((ptrint *) (sp + 5 * 8));
- o = (java_objectheader *) *((ptrint *) (sp + 4 * 8));
- f = (functionptr) *((ptrint *) (sp + 0 * 8));
-
- /* calculate and set the new return address */
-
- xpc = xpc - 1 * 4;
-
- *((ptrint *) (sp + 5 * 8)) = (ptrint) xpc;
-
- /* store PV into the patcher function position */
-
- *((ptrint *) (sp + 0 * 8)) = (ptrint) pv;
-
- /* cast the passed function to a patcher function */
-
- patcher_function = (bool (*)(u1 *)) (ptrint) f;
-
- /* enter a monitor on the patching position */
-
- PATCHER_MONITORENTER;
-
- /* create the stackframeinfo */
-
- stacktrace_create_extern_stackframeinfo(&sfi, pv, sp + 6 * 8, ra, xpc);
-
- /* call the proper patcher function */
+#include "vm/resolve.h"
- result = (patcher_function)(sp);
- /* remove the stackframeinfo */
+#define PATCH_BACK_ORIGINAL_MCODE \
+ *((u4 *) pr->mpc) = (u4) pr->mcode; \
+ md_icacheflush(NULL, 0);
- stacktrace_remove_stackframeinfo(&sfi);
-
- /* check for an error, get the exception and return it */
-
- if (result == false) {
- e = exceptions_get_and_clear_exception();
-
- PATCHER_MONITOREXIT;
-
- return e;
- }
-
- /* patch back original code */
-
- mcode = *((u4 *) (sp + 3 * 8));
-
- *((u4 *) xpc) = mcode;
-
- /* synchronize instruction cache */
-
- md_icacheflush(NULL, 0);
-
- PATCHER_MARK_PATCHED_MONITOREXIT;
-
- return NULL;
-}
/* patcher_initialize_class ****************************************************
*******************************************************************************/
-bool patcher_initialize_class(u1 *sp)
+bool patcher_initialize_class(patchref_t *pr)
{
classinfo *c;
/* get stuff from the stack */
- c = (classinfo *) *((ptrint *) (sp + 2 * 8));
+ c = (classinfo *) pr->ref;
/* check if the class is initialized */
if (!initialize_class(c))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
return true;
}
*******************************************************************************/
#ifdef ENABLE_VERIFIER
-bool patcher_resolve_class(u1 *sp)
+bool patcher_resolve_class(patchref_t *pr)
{
unresolved_class *uc;
- classinfo *c;
/* get stuff from the stack */
- uc = (unresolved_class *) *((ptrint *) (sp + 2 * 8));
+ uc = (unresolved_class *) pr->ref;
- /* resolve the class */
+ /* resolve the class and check subtype constraints */
- if (!resolve_class(uc, resolveEager, false, &c))
+ if (!resolve_class_eager_no_access_check(uc))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
return true;
}
#endif /* ENABLE_VERIFIER */
*******************************************************************************/
-bool patcher_resolve_classref_to_classinfo(u1 *sp)
+bool patcher_resolve_classref_to_classinfo(patchref_t *pr)
{
constant_classref *cr;
- s4 disp;
- u1 *pv;
+ u1 *datap;
classinfo *c;
/* get stuff from the stack */
- cr = (constant_classref *) *((ptrint *) (sp + 2 * 8));
- disp = *((s4 *) (sp + 1 * 8));
- pv = (u1 *) *((ptrint *) (sp + 0 * 8));
+ cr = (constant_classref *) pr->ref;
+ datap = (u1 *) pr->datap;
/* get the classinfo */
if (!(c = resolve_classref_eager(cr)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* patch the classinfo pointer */
- *((ptrint *) (pv + disp)) = (ptrint) c;
+ *((ptrint *) datap) = (ptrint) c;
return true;
}
*******************************************************************************/
-bool patcher_resolve_classref_to_vftbl(u1 *sp)
+bool patcher_resolve_classref_to_vftbl(patchref_t *pr)
{
constant_classref *cr;
- s4 disp;
- u1 *pv;
+ u1 *datap;
classinfo *c;
/* get stuff from the stack */
- cr = (constant_classref *) *((ptrint *) (sp + 2 * 8));
- disp = *((s4 *) (sp + 1 * 8));
- pv = (u1 *) *((ptrint *) (sp + 0 * 8));
+ cr = (constant_classref *) pr->ref;
+ datap = (u1 *) pr->datap;
/* get the fieldinfo */
if (!(c = resolve_classref_eager(cr)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* patch super class' vftbl */
- *((ptrint *) (pv + disp)) = (ptrint) c->vftbl;
+ *((ptrint *) datap) = (ptrint) c->vftbl;
return true;
}
*******************************************************************************/
-bool patcher_resolve_classref_to_flags(u1 *sp)
+bool patcher_resolve_classref_to_flags(patchref_t *pr)
{
constant_classref *cr;
- s4 disp;
- u1 *pv;
+ u1 *datap;
classinfo *c;
/* get stuff from the stack */
- cr = (constant_classref *) *((ptrint *) (sp + 2 * 8));
- disp = *((s4 *) (sp + 1 * 8));
- pv = (u1 *) *((ptrint *) (sp + 0 * 8));
+ cr = (constant_classref *) pr->ref;
+ datap = (u1 *) pr->datap;
/* get the fieldinfo */
if (!(c = resolve_classref_eager(cr)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* patch class flags */
- *((s4 *) (pv + disp)) = (s4) c->flags;
+ *((s4 *) datap) = (s4) c->flags;
return true;
}
*******************************************************************************/
#if !defined(WITH_STATIC_CLASSPATH)
-bool patcher_resolve_native_function(u1 *sp)
+bool patcher_resolve_native_function(patchref_t *pr)
{
methodinfo *m;
- s4 disp;
- u1 *pv;
+ u1 *datap;
functionptr f;
/* get stuff from the stack */
- m = (methodinfo *) *((ptrint *) (sp + 2 * 8));
- disp = *((s4 *) (sp + 1 * 8));
- pv = (u1 *) *((ptrint *) (sp + 0 * 8));
+ m = (methodinfo *) pr->ref;
+ datap = (u1 *) pr->datap;
/* resolve native function */
if (!(f = native_resolve_function(m)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* patch native function pointer */
- *((ptrint *) (pv + disp)) = (ptrint) f;
+ *((ptrint *) datap) = (ptrint) f;
return true;
}
*******************************************************************************/
-bool patcher_get_putstatic(u1 *sp)
+bool patcher_get_putstatic(patchref_t *pr)
{
unresolved_field *uf;
- s4 disp;
- u1 *pv;
+ u1 *datap;
fieldinfo *fi;
/* get stuff from the stack */
- uf = (unresolved_field *) *((ptrint *) (sp + 2 * 8));
- disp = *((s4 *) (sp + 1 * 8));
- pv = (u1 *) *((ptrint *) (sp + 0 * 8));
+ uf = (unresolved_field *) pr->ref;
+ datap = (u1 *) pr->datap;
/* get the fieldinfo */
if (!initialize_class(fi->class))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* patch the field value's address */
- *((ptrint *) (pv + disp)) = (ptrint) &(fi->value);
+ *((intptr_t *) datap) = (intptr_t) fi->value;
return true;
}
*******************************************************************************/
-bool patcher_get_putfield(u1 *sp)
+bool patcher_get_putfield(patchref_t *pr)
{
u1 *ra;
unresolved_field *uf;
fieldinfo *fi;
- ra = (u1 *) *((ptrint *) (sp + 5 * 8));
- uf = (unresolved_field *) *((ptrint *) (sp + 2 * 8));
+ ra = (u1 *) pr->mpc;
+ uf = (unresolved_field *) pr->ref;
/* get the fieldinfo */
if (!(fi = resolve_field_eager(uf)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* if we show disassembly, we have to skip the nop */
- if (opt_shownops) {
- /* patch the field's offset into the instruction */
+ if (opt_shownops)
+ ra = ra + 4;
+
+ /* patch the field's offset into the instruction */
- *((u4 *) (ra + 4)) |= (s2) (fi->offset & 0x0000ffff);
- }
- else {
- /* otherwise store the patched instruction on the stack */
+ *((u4 *) ra) |= (s2) (fi->offset & 0x0000ffff);
- *((u4 *) (sp + 3 * 8)) |= (s2) (fi->offset & 0x0000ffff);
- }
+ md_icacheflush(NULL, 0);
return true;
}
******************************************************************************/
-bool patcher_invokestatic_special(u1 *sp)
+bool patcher_invokestatic_special(patchref_t *pr)
{
unresolved_method *um;
- s4 disp;
- u1 *pv;
+ u1 *datap;
methodinfo *m;
/* get stuff from the stack */
- um = (unresolved_method *) *((ptrint *) (sp + 2 * 8));
- disp = *((s4 *) (sp + 1 * 8));
- pv = (u1 *) *((ptrint *) (sp + 0 * 8));
+ um = (unresolved_method *) pr->ref;
+ datap = (u1 *) pr->datap;
/* get the fieldinfo */
if (!(m = resolve_method_eager(um)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* patch stubroutine */
- *((ptrint *) (pv + disp)) = (ptrint) m->stubroutine;
+ *((ptrint *) datap) = (ptrint) m->stubroutine;
return true;
}
*******************************************************************************/
-bool patcher_invokevirtual(u1 *sp)
+bool patcher_invokevirtual(patchref_t *pr)
{
u1 *ra;
unresolved_method *um;
/* get stuff from the stack */
- ra = (u1 *) *((ptrint *) (sp + 5 * 8));
- um = (unresolved_method *) *((ptrint *) (sp + 2 * 8));
+ ra = (u1 *) pr->mpc;
+ um = (unresolved_method *) pr->ref;
/* get the fieldinfo */
if (!(m = resolve_method_eager(um)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* if we show disassembly, we have to skip the nop */
if (opt_shownops)
*((s4 *) (ra + 4)) |= (s4) ((OFFSET(vftbl_t, table[0]) +
sizeof(methodptr) * m->vftblindex) & 0x0000ffff);
+ md_icacheflush(NULL, 0);
+
return true;
}
*******************************************************************************/
-bool patcher_invokeinterface(u1 *sp)
+bool patcher_invokeinterface(patchref_t *pr)
{
u1 *ra;
unresolved_method *um;
/* get stuff from the stack */
- ra = (u1 *) *((ptrint *) (sp + 5 * 8));
- um = (unresolved_method *) *((ptrint *) (sp + 2 * 8));
+ ra = (u1 *) pr->mpc;
+ um = (unresolved_method *) pr->ref;
/* get the fieldinfo */
if (!(m = resolve_method_eager(um)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* if we show disassembly, we have to skip the nop */
if (opt_shownops)
*((s4 *) (ra + 4 + 4)) |=
(s4) ((sizeof(methodptr) * (m - m->class->methods)) & 0x0000ffff);
+ md_icacheflush(NULL, 0);
+
+ return true;
+}
+
+
+/* patcher_checkcast_interface *************************************************
+
+ Machine code:
+
+ <patched call position>
+ a78e0000 ldq at,0(s5)
+ a3bc001c ldl gp,28(at)
+ 23bdfffd lda gp,-3(gp)
+ efa0002e ble gp,0x00000200002bf6b0
+ a7bcffe8 ldq gp,-24(at)
+
+*******************************************************************************/
+
+bool patcher_checkcast_interface(patchref_t *pr)
+{
+ u1 *ra;
+ constant_classref *cr;
+ classinfo *c;
+
+ /* get stuff from the stack */
+
+ ra = (u1 *) pr->mpc;
+ cr = (constant_classref *) pr->ref;
+
+ /* get the fieldinfo */
+
+ if (!(c = resolve_classref_eager(cr)))
+ return false;
+
+ PATCH_BACK_ORIGINAL_MCODE;
+
+ /* if we show disassembly, we have to skip the nop */
+
+ if (opt_shownops)
+ ra = ra + 4;
+
+ /* patch super class index */
+
+ *((s4 *) (ra + 2 * 4)) |= (s4) (-(c->index) & 0x0000ffff);
+
+ *((s4 *) (ra + 5 * 4)) |= (s4) ((OFFSET(vftbl_t, interfacetable[0]) -
+ c->index * sizeof(methodptr*)) & 0x0000ffff);
+
+ md_icacheflush(NULL, 0);
+
return true;
}
-/* patcher_checkcast_instanceof_interface **************************************
+/* patcher_instanceof_interface ************************************************
Machine code:
*******************************************************************************/
-bool patcher_checkcast_instanceof_interface(u1 *sp)
+bool patcher_instanceof_interface(patchref_t *pr)
{
u1 *ra;
constant_classref *cr;
/* get stuff from the stack */
- ra = (u1 *) *((ptrint *) (sp + 5 * 8));
- cr = (constant_classref *) *((ptrint *) (sp + 2 * 8));
+ ra = (u1 *) pr->mpc;
+ cr = (constant_classref *) pr->ref;
/* get the fieldinfo */
if (!(c = resolve_classref_eager(cr)))
return false;
+ PATCH_BACK_ORIGINAL_MCODE;
+
/* if we show disassembly, we have to skip the nop */
if (opt_shownops)
*((s4 *) (ra + 4 * 4)) |= (s4) ((OFFSET(vftbl_t, interfacetable[0]) -
c->index * sizeof(methodptr*)) & 0x0000ffff);
+ md_icacheflush(NULL, 0);
+
return true;
}
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