openjdk-17/Apply-TBI-barrier-patch-to-C1.patch

From cfa76d24fb8fdee972a0e9a35479bceb288ca59e Mon Sep 17 00:00:00 2001
Date: Wed, 4 Jan 2023 20:46:49 +0800
Subject: Apply TBI barrier patch to C1

---
 .../gc/z/zBarrierSetAssembler_aarch64.cpp     | 14 ++++++----
 src/hotspot/cpu/aarch64/gc/z/z_aarch64.ad     | 28 ++++++++++++++++---
 2 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/src/hotspot/cpu/aarch64/gc/z/zBarrierSetAssembler_aarch64.cpp b/src/hotspot/cpu/aarch64/gc/z/zBarrierSetAssembler_aarch64.cpp
index cafd4e58f..41f047f2c 100644
--- a/src/hotspot/cpu/aarch64/gc/z/zBarrierSetAssembler_aarch64.cpp
+++ b/src/hotspot/cpu/aarch64/gc/z/zBarrierSetAssembler_aarch64.cpp
@@ -212,11 +212,8 @@ static void change_immediate(uint32_t& instr, uint32_t imm, uint32_t start, uint
 void ZBarrierSetAssembler::patch_barrier_relocation(address addr) {
   uint32_t* const patch_addr = (uint32_t*)addr;
 
-  // The next 3 insns should be movz, andr, cbnz.
-  assert(nativeInstruction_at(addr)->is_movz() &&
-    Instruction_aarch64::extract(*(patch_addr + 1), 30, 24) == 0b0001010 &&
-    Instruction_aarch64::extract(*(patch_addr + 2), 31, 24) == 0b10110101,
-    "wrong insns in barrier patch");
+  // The next insn should be movz.
+  assert(nativeInstruction_at(addr)->is_movz(), "wrong insn in barrier patch");
 
   change_immediate(*patch_addr, (uint16_t) (ZAddressBadMask >> 48), 5, 20);
   OrderAccess::fence();
@@ -232,7 +229,12 @@ void ZBarrierSetAssembler::generate_c1_load_barrier_test(LIR_Assembler* ce,
                                                          LIR_Opr ref) const {
   assert_different_registers(rscratch1, rthread, ref->as_register());
 
-  __ ldr(rscratch1, address_bad_mask_from_thread(rthread));
+  if (UseTBI) {
+    __ relocate(barrier_Relocation::spec());
+    __ movz(rscratch1, barrier_Relocation::unpatched, 48);
+  } else {
+    __ ldr(rscratch1, address_bad_mask_from_thread(rthread));
+  }
   __ tst(ref->as_register(), rscratch1);
 }
 
diff --git a/src/hotspot/cpu/aarch64/gc/z/z_aarch64.ad b/src/hotspot/cpu/aarch64/gc/z/z_aarch64.ad
index 426a1cc2a..4dc54c280 100644
--- a/src/hotspot/cpu/aarch64/gc/z/z_aarch64.ad
+++ b/src/hotspot/cpu/aarch64/gc/z/z_aarch64.ad
@@ -113,7 +113,12 @@ instruct zCompareAndSwapP(iRegINoSp res, indirect mem, iRegP oldval, iRegP newva
     __ cset($res$$Register, Assembler::EQ);
     if (barrier_data() != ZLoadBarrierElided) {
       Label good;
-      __ ldr(rscratch1, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
+      if (UseTBI) {
+        __ relocate(barrier_Relocation::spec());
+        __ movz(rscratch1, barrier_Relocation::unpatched, 48);
+      } else {
+        __ ldr(rscratch1, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
+      }
       __ andr(rscratch1, rscratch1, rscratch2);
       __ cbz(rscratch1, good);
       z_load_barrier_slow_path(_masm, this, Address($mem$$Register), rscratch2 /* ref */, rscratch1 /* tmp */);
@@ -145,7 +150,12 @@ instruct zCompareAndSwapPAcq(iRegINoSp res, indirect mem, iRegP oldval, iRegP ne
     __ cset($res$$Register, Assembler::EQ);
     if (barrier_data() != ZLoadBarrierElided) {
       Label good;
-      __ ldr(rscratch1, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
+      if (UseTBI) {
+        __ relocate(barrier_Relocation::spec());
+        __ movz(rscratch1, barrier_Relocation::unpatched, 48);
+      } else {
+        __ ldr(rscratch1, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
+      }
       __ andr(rscratch1, rscratch1, rscratch2);
       __ cbz(rscratch1, good);
       z_load_barrier_slow_path(_masm, this, Address($mem$$Register), rscratch2 /* ref */, rscratch1 /* tmp */ );
@@ -174,7 +184,12 @@ instruct zCompareAndExchangeP(iRegPNoSp res, indirect mem, iRegP oldval, iRegP n
                false /* acquire */, true /* release */, false /* weak */, $res$$Register);
     if (barrier_data() != ZLoadBarrierElided) {
       Label good;
-      __ ldr(rscratch1, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
+      if (UseTBI) {
+        __ relocate(barrier_Relocation::spec());
+        __ movz(rscratch1, barrier_Relocation::unpatched, 48);
+      } else {
+        __ ldr(rscratch1, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
+      }
       __ andr(rscratch1, rscratch1, $res$$Register);
       __ cbz(rscratch1, good);
       z_load_barrier_slow_path(_masm, this, Address($mem$$Register), $res$$Register /* ref */, rscratch1 /* tmp */);
@@ -202,7 +217,12 @@ instruct zCompareAndExchangePAcq(iRegPNoSp res, indirect mem, iRegP oldval, iReg
                true /* acquire */, true /* release */, false /* weak */, $res$$Register);
     if (barrier_data() != ZLoadBarrierElided) {
       Label good;
-      __ ldr(rscratch1, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
+      if (UseTBI) {
+        __ relocate(barrier_Relocation::spec());
+        __ movz(rscratch1, barrier_Relocation::unpatched, 48);
+      } else {
+        __ ldr(rscratch1, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
+      }
       __ andr(rscratch1, rscratch1, $res$$Register);
       __ cbz(rscratch1, good);
       z_load_barrier_slow_path(_masm, this, Address($mem$$Register), $res$$Register /* ref */, rscratch1 /* tmp */);
-- 
2.37.0