/* src/vm/jit/x86_64/patcher.c - x86_64 code patching functions
- Copyright (C) 1996-2005, 2006, 2007, 2008
+ Copyright (C) 1996-2005, 2006, 2007, 2008, 2009
CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
This file is part of CACAO.
#include "vm/types.h"
#include "vm/jit/x86_64/codegen.h"
+#include "vm/jit/x86_64/md.h"
-#include "mm/memory.h"
+#include "mm/memory.hpp"
-#include "native/native.h"
+#include "native/native.hpp"
-#include "vm/builtin.h"
-#include "vm/exceptions.h"
-#include "vm/initialize.h"
+#include "vm/jit/builtin.hpp"
+#include "vm/class.hpp"
+#include "vm/field.hpp"
+#include "vm/initialize.hpp"
+#include "vm/options.h"
+#include "vm/references.h"
+#include "vm/resolve.hpp"
-#include "vm/jit/patcher-common.h"
-#include "vm/jit/stacktrace.h"
-
-#include "vmcore/class.h"
-#include "vmcore/field.h"
-#include "vmcore/options.h"
-#include "vmcore/references.h"
-#include "vm/resolve.h"
-
-
-#define PATCH_BACK_ORIGINAL_MCODE \
- do { \
- *((uint16_t *) pr->mpc) = (uint16_t) pr->mcode; \
- } while (0)
+#include "vm/jit/patcher-common.hpp"
/* patcher_patch_code **********************************************************
void patcher_patch_code(patchref_t *pr)
{
- PATCH_BACK_ORIGINAL_MCODE;
+ *((uint16_t*) pr->mpc) = (uint16_t) pr->mcode;
+ md_icacheflush((void*) pr->mpc, PATCHER_CALL_SIZE);
+}
+
+/**
+ * Check if the trap instruction at the given PC is valid.
+ *
+ * @param pc Program counter.
+ *
+ * @return true if valid, false otherwise.
+ */
+bool patcher_is_valid_trap_instruction_at(void* pc)
+{
+ uint16_t mcode = *((uint16_t*) pc);
+
+ // Check for the undefined instruction we use.
+ return (mcode == 0x0b0f);
}
bool patcher_resolve_classref_to_classinfo(patchref_t *pr)
{
- constant_classref *cr;
- intptr_t *datap;
- classinfo *c;
-
- cr = (constant_classref *) pr->ref;
- datap = (intptr_t *) pr->datap;
+ constant_classref* cr = (constant_classref*) pr->ref;
+ uintptr_t* datap = (uintptr_t*) pr->datap;
- /* get the classinfo */
+ // Resolve the class.
+ classinfo* c = resolve_classref_eager(cr);
- if (!(c = resolve_classref_eager(cr)))
+ if (c == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
+ // Patch the class.
+ *datap = (uintptr_t) c;
- /* patch the classinfo pointer */
+ // Synchronize data cache.
+ md_dcacheflush((void*) pr->datap, SIZEOF_VOID_P);
- *datap = (intptr_t) c;
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
bool patcher_resolve_classref_to_vftbl(patchref_t *pr)
{
- constant_classref *cr;
- intptr_t *datap;
- classinfo *c;
+ constant_classref* cr = (constant_classref*) pr->ref;
+ uintptr_t* datap = (uintptr_t*) pr->datap;
- /* get stuff from the stack */
+ // Resolve the field.
+ classinfo* c = resolve_classref_eager(cr);
- cr = (constant_classref *) pr->ref;
- datap = (intptr_t *) pr->datap;
-
- /* get the fieldinfo */
-
- if (!(c = resolve_classref_eager(cr)))
+ if (c == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
+ // Patch super class' vftbl.
+ *datap = (uintptr_t) c->vftbl;
- /* patch super class' vftbl */
+ // Synchronize data cache.
+ md_dcacheflush((void*) pr->datap, SIZEOF_VOID_P);
- *datap = (intptr_t) c->vftbl;
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
bool patcher_resolve_classref_to_flags(patchref_t *pr)
{
- constant_classref *cr;
- int32_t *datap;
- classinfo *c;
- uint8_t *ra;
-
- cr = (constant_classref *) pr->ref;
- datap = (int32_t *) pr->datap;
- ra = (uint8_t *) pr->mpc;
+ constant_classref* cr = (constant_classref*) pr->ref;
+/* int32_t* datap = (int32_t*) pr->datap; */
+ uint8_t* ra = (uint8_t*) pr->mpc;
- /* get the fieldinfo */
+ // Resolve the field.
+ classinfo* c = resolve_classref_eager(cr);
- if (!(c = resolve_classref_eager(cr)))
+ if (c == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
+ ra += PATCHER_CALL_SIZE;
- /* if we show disassembly, we have to skip the nop's */
-
- if (opt_shownops)
- ra = ra + PATCHER_CALL_SIZE;
+ // Patch class flags.
+/* *datap = c->flags; */
+ *((int32_t*) (ra + 2)) = c->flags;
- /* patch class flags */
+ // Synchronize data cache.
+/* md_dcacheflush(datap, sizeof(int32_t)); */
+ md_icacheflush(ra + 2, sizeof(int32_t));
-/* *datap = c->flags; */
- *((int32_t *) (ra + 2)) = c->flags;
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
bool patcher_get_putstatic(patchref_t *pr)
{
- unresolved_field *uf;
- intptr_t *datap;
- fieldinfo *fi;
+ unresolved_field* uf = (unresolved_field*) pr->ref;
+ uintptr_t* datap = (uintptr_t*) pr->datap;
+ uint8_t* ra = (uint8_t*) pr->mpc;
- uf = (unresolved_field *) pr->ref;
- datap = (intptr_t *) pr->datap;
+ // Resolve the field.
+ fieldinfo* fi = resolve_field_eager(uf);
- /* get the fieldinfo */
-
- if (!(fi = resolve_field_eager(uf)))
+ if (fi == NULL)
return false;
- /* check if the field's class is initialized */
+ ra += PATCHER_CALL_SIZE;
- if (!(fi->class->state & CLASS_INITIALIZED))
- if (!initialize_class(fi->class))
+ // Check if the field's class is initialized/
+ if (!(fi->clazz->state & CLASS_INITIALIZED))
+ if (!initialize_class(fi->clazz))
return false;
- PATCH_BACK_ORIGINAL_MCODE;
+ // Patch the field value's address.
+ *datap = (uintptr_t) fi->value;
- /* patch the field value's address */
+ // Synchronize data cache.
+ md_dcacheflush((void*) pr->datap, SIZEOF_VOID_P);
- *datap = (intptr_t) fi->value;
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
bool patcher_get_putfield(patchref_t *pr)
{
- uint8_t *ra;
- unresolved_field *uf;
- fieldinfo *fi;
- uint8_t byte;
-
- ra = (uint8_t *) pr->mpc;
- uf = (unresolved_field *) pr->ref;
+ uint8_t* pc = (uint8_t*) pr->mpc;
+ unresolved_field* uf = (unresolved_field*) pr->ref;
- /* get the fieldinfo */
+ // Resolve the field.
+ fieldinfo* fi = resolve_field_eager(uf);
- if (!(fi = resolve_field_eager(uf)))
+ if (fi == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
-
- /* if we show disassembly, we have to skip the nop's */
-
- if (opt_shownops)
- ra = ra + PATCHER_CALL_SIZE;
-
- /* Patch the field's offset: we check for the field type, because
- the instructions have different lengths. */
+ pc += PATCHER_CALL_SIZE;
+ // Patch the field's offset: we check for the field type, because
+ // the instructions have different lengths.
if (IS_INT_LNG_TYPE(fi->type)) {
- /* Check for special case: %rsp or %r12 as base register. */
-
- byte = *(ra + 3);
-
- if (byte == 0x24)
- *((int32_t *) (ra + 4)) = fi->offset;
+ // Check for special case: %rsp or %r12 as base register.
+ if (pc[3] == 0x24)
+ *((int32_t*) (pc + 4)) = fi->offset;
else
- *((int32_t *) (ra + 3)) = fi->offset;
+ *((int32_t*) (pc + 3)) = fi->offset;
}
else {
- /* Check for special case: %rsp or %r12 as base register. */
-
- byte = *(ra + 5);
-
- if (byte == 0x24)
- *((int32_t *) (ra + 6)) = fi->offset;
+ // Check for special case: %rsp or %r12 as base register.
+ if (pc[5] == 0x24)
+ *((int32_t*) (pc + 6)) = fi->offset;
else
- *((int32_t *) (ra + 5)) = fi->offset;
+ *((int32_t*) (pc + 5)) = fi->offset;
}
+ // Synchronize instruction cache.
+ md_icacheflush(pc, 6 + sizeof(int32_t));
+
+ // Patch back the original code.
+ patcher_patch_code(pr);
+
return true;
}
bool patcher_putfieldconst(patchref_t *pr)
{
- uint8_t *ra;
- unresolved_field *uf;
- fieldinfo *fi;
- uint8_t byte;
-
- ra = (uint8_t *) pr->mpc;
- uf = (unresolved_field *) pr->ref;
+ uint8_t* pc = (uint8_t*) pr->mpc;
+ unresolved_field* uf = (unresolved_field*) pr->ref;
- /* get the fieldinfo */
+ // Resolve the field.
+ fieldinfo* fi = resolve_field_eager(uf);
- if (!(fi = resolve_field_eager(uf)))
+ if (fi == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
-
- /* if we show disassembly, we have to skip the nop's */
-
- if (opt_shownops)
- ra = ra + PATCHER_CALL_SIZE;
-
- /* patch the field's offset */
+ pc += PATCHER_CALL_SIZE;
+ // Patch the field's offset.
if (IS_2_WORD_TYPE(fi->type) || IS_ADR_TYPE(fi->type)) {
- /* handle special case when the base register is %r12 */
-
- byte = *(ra + 2);
-
- if (byte == 0x84) {
- *((uint32_t *) (ra + 4)) = fi->offset;
- *((uint32_t *) (ra + 12 + 4)) = fi->offset + 4;
- }
- else {
- *((uint32_t *) (ra + 3)) = fi->offset;
- *((uint32_t *) (ra + 11 + 3)) = fi->offset + 4;
- }
+ // Handle special case when the base register is %r12.
+ if (pc[12] == 0x94)
+ *((uint32_t*) (pc + 14)) = fi->offset;
+ else
+ *((uint32_t*) (pc + 13)) = fi->offset;
}
else {
- /* handle special case when the base register is %r12 */
-
- byte = *(ra + 2);
-
- if (byte == 0x84)
- *((uint32_t *) (ra + 4)) = fi->offset;
+ // Handle special case when the base register is %r12.
+ if (pc[2] == 0x84)
+ *((uint32_t*) (pc + 4)) = fi->offset;
else
- *((uint32_t *) (ra + 3)) = fi->offset;
+ *((uint32_t*) (pc + 3)) = fi->offset;
}
+ // Synchronize instruction cache.
+ md_icacheflush(pc, 14 + sizeof(int32_t));
+
+ // Patch back the original code.
+ patcher_patch_code(pr);
+
return true;
}
bool patcher_invokestatic_special(patchref_t *pr)
{
- unresolved_method *um;
- intptr_t *datap;
- methodinfo *m;
-
- /* get stuff from the stack */
+ unresolved_method* um = (unresolved_method*) pr->ref;
+ uintptr_t* datap = (uintptr_t*) pr->datap;
- um = (unresolved_method *) pr->ref;
- datap = (intptr_t *) pr->datap;
+ // Resolve the method.
+ methodinfo* m = resolve_method_eager(um);
- /* get the fieldinfo */
-
- if (!(m = resolve_method_eager(um)))
+ if (m == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
+ // Patch stubroutine.
+ *datap = (uintptr_t) m->stubroutine;
- /* patch stubroutine */
+ // Synchronize data cache.
+ md_dcacheflush((void*) pr->datap, SIZEOF_VOID_P);
- *datap = (intptr_t) m->stubroutine;
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
bool patcher_invokevirtual(patchref_t *pr)
{
- uint8_t *ra;
- unresolved_method *um;
- methodinfo *m;
-
- ra = (uint8_t *) pr->mpc;
- um = (unresolved_method *) pr->ref;
+ uint8_t* pc = (uint8_t*) pr->mpc;
+ unresolved_method* um = (unresolved_method*) pr->ref;
- /* get the methodinfo */
+ // Resovlve the method.
+ methodinfo* m = resolve_method_eager(um);
- if (!(m = resolve_method_eager(um)))
+ if (m == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
-
- /* if we show disassembly, we have to skip the nop's */
+ pc += PATCHER_CALL_SIZE;
- if (opt_shownops)
- ra = ra + PATCHER_CALL_SIZE;
+ // Patch vftbl index.
+ *((int32_t*) (pc + 3 + 3)) = (int32_t) (OFFSET(vftbl_t, table[0]) + sizeof(methodptr) * m->vftblindex);
- /* patch vftbl index */
+ // Synchronize instruction cache.
+ md_icacheflush(pc + 3 + 3, SIZEOF_VOID_P);
- *((int32_t *) (ra + 3 + 3)) =
- (int32_t) (OFFSET(vftbl_t, table[0]) +
- sizeof(methodptr) * m->vftblindex);
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
bool patcher_invokeinterface(patchref_t *pr)
{
- uint8_t *ra;
- unresolved_method *um;
- methodinfo *m;
+ uint8_t* pc = (uint8_t*) pr->mpc;
+ unresolved_method* um = (unresolved_method*) pr->ref;
- /* get stuff from the stack */
+ // Resolve the method.
+ methodinfo* m = resolve_method_eager(um);
- ra = (uint8_t *) pr->mpc;
- um = (unresolved_method *) pr->ref;
-
- /* get the fieldinfo */
-
- if (!(m = resolve_method_eager(um)))
+ if (m == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
-
- /* if we show disassembly, we have to skip the nop's */
+ pc += PATCHER_CALL_SIZE;
- if (opt_shownops)
- ra = ra + PATCHER_CALL_SIZE;
+ // Patch interfacetable index.
+ *((int32_t*) (pc + 3 + 3)) = (int32_t) (OFFSET(vftbl_t, interfacetable[0]) - sizeof(methodptr) * m->clazz->index);
- /* patch interfacetable index */
+ // Patch method offset.
+ *((int32_t*) (pc + 3 + 7 + 3)) = (int32_t) (sizeof(methodptr) * (m - m->clazz->methods));
- *((int32_t *) (ra + 3 + 3)) =
- (int32_t) (OFFSET(vftbl_t, interfacetable[0]) -
- sizeof(methodptr) * m->clazz->index);
+ // Synchronize instruction cache.
+ md_icacheflush(pc + 3 + 3, SIZEOF_VOID_P + 3 + SIZEOF_VOID_P);
- /* patch method offset */
-
- *((int32_t *) (ra + 3 + 7 + 3)) =
- (int32_t) (sizeof(methodptr) * (m - m->clazz->methods));
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
bool patcher_checkcast_interface(patchref_t *pr)
{
- uint8_t *ra;
- constant_classref *cr;
- classinfo *c;
-
- ra = (uint8_t *) pr->mpc;
- cr = (constant_classref *) pr->ref;
+ uint8_t* pc = (uint8_t*) pr->mpc;
+ constant_classref* cr = (constant_classref*) pr->ref;
- /* get the fieldinfo */
+ // Resolve the class.
+ classinfo* c = resolve_classref_eager(cr);
- if (!(c = resolve_classref_eager(cr)))
+ if (c == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
-
- /* if we show disassembly, we have to skip the nop's */
+ pc += PATCHER_CALL_SIZE;
- if (opt_shownops)
- ra = ra + PATCHER_CALL_SIZE;
+ // Patch super class index.
+ *((int32_t*) (pc + 7 + 3)) = c->index;
- /* patch super class index */
+ *((int32_t*) (pc + 7 + 7 + 6 + 8 + 3)) = (int32_t) (OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*));
- *((int32_t *) (ra + 7 + 3)) = c->index;
+ // Synchronize instruction cache.
+ md_icacheflush(pc + 7 + 3, sizeof(int32_t) + 6 + 8 + 3 + sizeof(int32_t));
- *((int32_t *) (ra + 7 + 7 + 6 + 8 + 3)) =
- (int32_t) (OFFSET(vftbl_t, interfacetable[0]) -
- c->index * sizeof(methodptr*));
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
bool patcher_instanceof_interface(patchref_t *pr)
{
- uint8_t *ra;
- constant_classref *cr;
- classinfo *c;
+ uint8_t* pc = (uint8_t*) pr->mpc;
+ constant_classref* cr = (constant_classref*) pr->ref;
- ra = (uint8_t *) pr->mpc;
- cr = (constant_classref *) pr->ref;
+ // Resolve the class.
+ classinfo* c = resolve_classref_eager(cr);
- /* get the fieldinfo */
-
- if (!(c = resolve_classref_eager(cr)))
+ if (c == NULL)
return false;
- PATCH_BACK_ORIGINAL_MCODE;
-
- /* if we show disassembly, we have to skip the nop's */
+ pc += PATCHER_CALL_SIZE;
- if (opt_shownops)
- ra = ra + PATCHER_CALL_SIZE;
+ // Patch super class index.
+ *((int32_t*) (pc + 7 + 3)) = c->index;
- /* patch super class index */
+ *((int32_t*) (pc + 7 + 7 + 6 + 3)) = (int32_t) (OFFSET(vftbl_t, interfacetable[0]) - c->index * sizeof(methodptr*));
- *((int32_t *) (ra + 7 + 3)) = c->index;
+ // Synchronize instruction cache.
+ md_icacheflush(pc + 7 + 3, sizeof(int32_t) + 6 + 3 + sizeof(int32_t));
- *((int32_t *) (ra + 7 + 7 + 6 + 3)) =
- (int32_t) (OFFSET(vftbl_t, interfacetable[0]) -
- c->index * sizeof(methodptr*));
+ // Patch back the original code.
+ patcher_patch_code(pr);
return true;
}
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