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 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2012, 2013 SAP AG. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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  */

 #include "precompiled.hpp"

 #include "asm/macroAssembler.inline.hpp"

 #include "memory/resourceArea.hpp"

 #include "nativeInst_ppc.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/handles.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/stubRoutines.hpp"

 #include "utilities/ostream.hpp"

 #ifdef COMPILER1

 #include "c1/c1_Runtime1.hpp"

 #endif

 // We use an illtrap for marking a method as not_entrant or zombie iff !UseSIGTRAP

 // Work around a C++ compiler bug which changes 'this'

 bool NativeInstruction::is_sigill_zombie_not_entrant_at(address addr) {

   assert(!UseSIGTRAP, "precondition");

   if (*(int*)addr != 0 /*illtrap*/) return false;

   CodeBlob* cb = CodeCache::find_blob_unsafe(addr);

   if (cb == NULL || !cb->is_nmethod()) return false;

   nmethod *nm = (nmethod *)cb;

   // This method is not_entrant or zombie iff the illtrap instruction is

   // located at the verified entry point.

   return nm->verified_entry_point() == addr;

 }

 #ifdef ASSERT

 void NativeInstruction::verify() {

   // Make sure code pattern is actually an instruction address.

   address addr = addr_at(0);

   if (addr == 0 || ((intptr_t)addr & 3) != 0) {

     fatal("not an instruction address");

   }

 }

 #endif // ASSERT

 // Extract call destination from a NativeCall. The call might use a trampoline stub.

 address NativeCall::destination() const {

   address addr = (address)this;

   address destination = Assembler::bxx_destination(addr);

   // Do we use a trampoline stub for this call?

   CodeBlob* cb = CodeCache::find_blob_unsafe(addr);   // Else we get assertion if nmethod is zombie.

   assert(cb && cb->is_nmethod(), "sanity");

   nmethod *nm = (nmethod *)cb;

   if (nm->stub_contains(destination) && is_NativeCallTrampolineStub_at(destination)) {

     // Yes we do, so get the destination from the trampoline stub.

     const address trampoline_stub_addr = destination;

     destination = NativeCallTrampolineStub_at(trampoline_stub_addr)->destination();

   }

   return destination;

 }

 // Similar to replace_mt_safe, but just changes the destination. The

 // important thing is that free-running threads are able to execute this

 // call instruction at all times. Thus, the displacement field must be

 // instruction-word-aligned.

 //

 // Used in the runtime linkage of calls; see class CompiledIC.

 //

 // Add parameter assert_lock to switch off assertion

 // during code generation, where no patching lock is needed.

 void NativeCall::set_destination_mt_safe(address dest, bool assert_lock) {

   assert(!assert_lock ||

          (Patching_lock->is_locked() || SafepointSynchronize::is_at_safepoint()),

          "concurrent code patching");

   ResourceMark rm;

   int code_size = 1 * BytesPerInstWord;

   address addr_call = addr_at(0);

   assert(MacroAssembler::is_bl(*(int*)addr_call), "unexpected code at call-site");

   CodeBuffer cb(addr_call, code_size + 1);

   MacroAssembler* a = new MacroAssembler(&cb);

   // Patch the call.

   if (ReoptimizeCallSequences &&

       a->is_within_range_of_b(dest, addr_call)) {

     a->bl(dest);

   } else {

     address trampoline_stub_addr = get_trampoline();

     // We did not find a trampoline stub because the current codeblob

     // does not provide this information. The branch will be patched

     // later during a final fixup, when all necessary information is

     // available.

     if (trampoline_stub_addr == 0)

       return;

     // Patch the constant in the call's trampoline stub.

     NativeCallTrampolineStub_at(trampoline_stub_addr)->set_destination(dest);

     a->bl(trampoline_stub_addr);

   }

   ICache::invalidate_range(addr_call, code_size);

 }

 address NativeCall::get_trampoline() {

   address call_addr = addr_at(0);

   CodeBlob *code = CodeCache::find_blob(call_addr);

   assert(code != NULL, "Could not find the containing code blob");

   // There are no relocations available when the code gets relocated

   // because of CodeBuffer expansion.

   if (code->relocation_size() == 0)

     return NULL;

   address bl_destination = Assembler::bxx_destination(call_addr);

   if (code->content_contains(bl_destination) &&

       is_NativeCallTrampolineStub_at(bl_destination))

     return bl_destination;

   // If the codeBlob is not a nmethod, this is because we get here from the

   // CodeBlob constructor, which is called within the nmethod constructor.

   return trampoline_stub_Relocation::get_trampoline_for(call_addr, (nmethod*)code);

 }

 #ifdef ASSERT

 void NativeCall::verify() {

   address addr = addr_at(0);

   if (!NativeCall::is_call_at(addr)) {

     tty->print_cr("not a NativeCall at " PTR_FORMAT, addr);

     // TODO: PPC port: Disassembler::decode(addr - 20, addr + 20, tty);

     fatal(err_msg("not a NativeCall at " PTR_FORMAT, addr));

   }

 }

 #endif // ASSERT

 #ifdef ASSERT

 void NativeFarCall::verify() {

   address addr = addr_at(0);

   NativeInstruction::verify();

   if (!NativeFarCall::is_far_call_at(addr)) {

     tty->print_cr("not a NativeFarCall at " PTR_FORMAT, addr);

     // TODO: PPC port: Disassembler::decode(addr, 20, 20, tty);

     fatal(err_msg("not a NativeFarCall at " PTR_FORMAT, addr));

   }

 }

 #endif // ASSERT

 address NativeMovConstReg::next_instruction_address() const {

 #ifdef ASSERT

   CodeBlob* nm = CodeCache::find_blob(instruction_address());

   assert(!MacroAssembler::is_set_narrow_oop(addr_at(0), nm->content_begin()), "Should not patch narrow oop here");

 #endif

   if (MacroAssembler::is_load_const_from_method_toc_at(addr_at(0))) {

     return addr_at(load_const_from_method_toc_instruction_size);

   } else {

     return addr_at(load_const_instruction_size);

   }

 }

 intptr_t NativeMovConstReg::data() const {

   address   addr = addr_at(0);

   CodeBlob* cb = CodeCache::find_blob_unsafe(addr);

   if (MacroAssembler::is_load_const_at(addr)) {

     return MacroAssembler::get_const(addr);

   } else if (MacroAssembler::is_set_narrow_oop(addr, cb->content_begin())) {

     narrowOop no = (narrowOop)MacroAssembler::get_narrow_oop(addr, cb->content_begin());

     return cast_from_oop<intptr_t>(oopDesc::decode_heap_oop(no));

   } else {

     assert(MacroAssembler::is_load_const_from_method_toc_at(addr), "must be load_const_from_pool");

     address ctable = cb->content_begin();

     int offset = MacroAssembler::get_offset_of_load_const_from_method_toc_at(addr);

     return *(intptr_t *)(ctable + offset);

   }

 }

 address NativeMovConstReg::set_data_plain(intptr_t data, CodeBlob *cb) {

   address addr         = instruction_address();

   address next_address = NULL;

   if (!cb) cb = CodeCache::find_blob(addr);

   if (cb != NULL && MacroAssembler::is_load_const_from_method_toc_at(addr)) {

     // A load from the method's TOC (ctable).

     assert(cb->is_nmethod(), "must be nmethod");

     const address ctable = cb->content_begin();

     const int toc_offset = MacroAssembler::get_offset_of_load_const_from_method_toc_at(addr);

     *(intptr_t *)(ctable + toc_offset) = data;

     next_address = addr + BytesPerInstWord;

   } else if (cb != NULL &&

              MacroAssembler::is_calculate_address_from_global_toc_at(addr, cb->content_begin())) {

     // A calculation relative to the global TOC.

     const int invalidated_range =

       MacroAssembler::patch_calculate_address_from_global_toc_at(addr, cb->content_begin(),

                                                                  (address)data);

     const address start = invalidated_range < 0 ? addr + invalidated_range : addr;

     // FIXME:

     const int range = invalidated_range < 0 ? 4 - invalidated_range : 8;

     ICache::invalidate_range(start, range);

     next_address = addr + 1 * BytesPerInstWord;

   } else if (MacroAssembler::is_load_const_at(addr)) {

     // A normal 5 instruction load_const code sequence.

     // This is not mt safe, ok in methods like CodeBuffer::copy_code().

     MacroAssembler::patch_const(addr, (long)data);

     ICache::invalidate_range(addr, load_const_instruction_size);

     next_address = addr + 5 * BytesPerInstWord;

   } else if (MacroAssembler::is_bl(* (int*) addr)) {

     // A single branch-and-link instruction.

     ResourceMark rm;

     const int code_size = 1 * BytesPerInstWord;

     CodeBuffer cb(addr, code_size + 1);

     MacroAssembler* a = new MacroAssembler(&cb);

     a->bl((address) data);

     ICache::invalidate_range(addr, code_size);

     next_address = addr + code_size;

   } else {

     ShouldNotReachHere();

   }

   return next_address;

 }

 void NativeMovConstReg::set_data(intptr_t data) {

   // Store the value into the instruction stream.

   CodeBlob *cb = CodeCache::find_blob(instruction_address());

   address next_address = set_data_plain(data, cb);

   // Also store the value into an oop_Relocation cell, if any.

   if (cb && cb->is_nmethod()) {

     RelocIterator iter((nmethod *) cb, instruction_address(), next_address);

     oop* oop_addr = NULL;

     Metadata** metadata_addr = NULL;

     while (iter.next()) {

       if (iter.type() == relocInfo::oop_type) {

         oop_Relocation *r = iter.oop_reloc();

         if (oop_addr == NULL) {

           oop_addr = r->oop_addr();

           *oop_addr = cast_to_oop(data);

         } else {

           assert(oop_addr == r->oop_addr(), "must be only one set-oop here") ;

         }

       }

       if (iter.type() == relocInfo::metadata_type) {

         metadata_Relocation *r = iter.metadata_reloc();

         if (metadata_addr == NULL) {

           metadata_addr = r->metadata_addr();

           *metadata_addr = (Metadata*)data;

         } else {

           assert(metadata_addr == r->metadata_addr(), "must be only one set-metadata here");

         }

       }

     }

   }

 }

 void NativeMovConstReg::set_narrow_oop(narrowOop data, CodeBlob *code /* = NULL */) {

   address   addr = addr_at(0);

   CodeBlob* cb = (code) ? code : CodeCache::find_blob(instruction_address());

   const int invalidated_range =

     MacroAssembler::patch_set_narrow_oop(addr, cb->content_begin(), (long)data);

   const address start = invalidated_range < 0 ? addr + invalidated_range : addr;

   // FIXME:

   const int range = invalidated_range < 0 ? 4 - invalidated_range : 8;

   ICache::invalidate_range(start, range);

 }

 // Do not use an assertion here. Let clients decide whether they only

 // want this when assertions are enabled.

 #ifdef ASSERT

 void NativeMovConstReg::verify() {

   address   addr = addr_at(0);

   CodeBlob* cb = CodeCache::find_blob_unsafe(addr);   // find_nmethod() asserts if nmethod is zombie.

   if (! MacroAssembler::is_load_const_at(addr) &&

       ! MacroAssembler::is_load_const_from_method_toc_at(addr) &&

       ! (cb != NULL && MacroAssembler::is_calculate_address_from_global_toc_at(addr, cb->content_begin())) &&

       ! (cb != NULL && MacroAssembler::is_set_narrow_oop(addr, cb->content_begin())) &&

       ! MacroAssembler::is_bl(*((int*) addr))) {

     tty->print_cr("not a NativeMovConstReg at " PTR_FORMAT, addr);

     // TODO: PPC port Disassembler::decode(addr, 20, 20, tty);

     fatal(err_msg("not a NativeMovConstReg at " PTR_FORMAT, addr));

   }

 }

 #endif // ASSERT

 void NativeJump::patch_verified_entry(address entry, address verified_entry, address dest) {

   ResourceMark rm;

   int code_size = 1 * BytesPerInstWord;

   CodeBuffer cb(verified_entry, code_size + 1);

   MacroAssembler* a = new MacroAssembler(&cb);

 #ifdef COMPILER2

   assert(dest == SharedRuntime::get_handle_wrong_method_stub(), "expected fixed destination of patch");

 #endif

   // Patch this nmethod atomically. Always use illtrap/trap in debug build.

   if (DEBUG_ONLY(false &&) a->is_within_range_of_b(dest, a->pc())) {

     a->b(dest);

   } else {

     // The signal handler will continue at dest=OptoRuntime::handle_wrong_method_stub().

     if (TrapBasedNotEntrantChecks) {

       // We use a special trap for marking a method as not_entrant or zombie.

       a->trap_zombie_not_entrant();

     } else {

       // We use an illtrap for marking a method as not_entrant or zombie.

       a->illtrap();

     }

   }

   ICache::invalidate_range(verified_entry, code_size);

 }

 #ifdef ASSERT

 void NativeJump::verify() {

   address addr = addr_at(0);

   NativeInstruction::verify();

   if (!NativeJump::is_jump_at(addr)) {

     tty->print_cr("not a NativeJump at " PTR_FORMAT, addr);

     // TODO: PPC port: Disassembler::decode(addr, 20, 20, tty);

     fatal(err_msg("not a NativeJump at " PTR_FORMAT, addr));

   }

 }

 #endif // ASSERT

 //-------------------------------------------------------------------

 // Call trampoline stubs.

 //

 // Layout and instructions of a call trampoline stub:

 //    0:  load the TOC (part 1)

 //    4:  load the TOC (part 2)

 //    8:  load the call target from the constant pool (part 1)

 //  [12:  load the call target from the constant pool (part 2, optional)]

 //   ..:  branch via CTR

 //

 address NativeCallTrampolineStub::encoded_destination_addr() const {

   address instruction_addr = addr_at(2 * BytesPerInstWord);

   assert(MacroAssembler::is_ld_largeoffset(instruction_addr),

          "must be a ld with large offset (from the constant pool)");

   return instruction_addr;

 }

 address NativeCallTrampolineStub::destination() const {

   CodeBlob* cb = CodeCache::find_blob(addr_at(0));

   address ctable = cb->content_begin();

   return *(address*)(ctable + destination_toc_offset());

 }

 int NativeCallTrampolineStub::destination_toc_offset() const {

   return MacroAssembler::get_ld_largeoffset_offset(encoded_destination_addr());

 }

 void NativeCallTrampolineStub::set_destination(address new_destination) {

   CodeBlob* cb = CodeCache::find_blob(addr_at(0));

   address ctable = cb->content_begin();

   *(address*)(ctable + destination_toc_offset()) = new_destination;

 }