[Tizen] Support relative indirection for 1st and 2nd levels of vtable on arm64

1 files changed, 20 insertions, 1 deletions

diff --git a/src/jit/codegencommon.cpp b/src/jit/codegencommon.cpp
index 8725619ceb..3c0d0b600b 100644
--- a/src/jit/codegencommon.cpp
+++ b/src/jit/codegencommon.cpp
@@ -8479,6 +8479,7 @@ void CodeGen::genFnEpilog(BasicBlock* block)
         //     ...
         //     bx r12
 
+        assert(REG_R12 == REG_INDIRECT_CALL_TARGET_REG);
         regNumber indCallReg = REG_R12;
         regNumber vptrReg1   = REG_LR;
 
@@ -8510,6 +8511,24 @@ void CodeGen::genFnEpilog(BasicBlock* block)
     compiler->unwindBegEpilog();
 
     genPopCalleeSavedRegistersAndFreeLclFrame(jmpEpilog);
+
+    if (jmpEpilog && lastNode->gtOper == GT_JMP && addrInfo.accessType == IAT_RELPVALUE)
+    {
+        // TODO-ARM64-CQ: update this!
+        // IAT_RELPVALUE jump at the end is done using relative indirection, so,
+        // additional helper register is required.
+        // REG_IP1 (x17) is always reserved on arm64 (see Compiler::compRsvdRegCheck)
+        // and is used as a temporary register. Use it as temp register here too.
+
+        assert(REG_IP0 == REG_INDIRECT_CALL_TARGET_REG);
+        regNumber indCallReg = REG_IP0;
+        regNumber vptrReg1   = REG_IP1;
+
+        instGen_Set_Reg_To_Imm(EA_HANDLE_CNS_RELOC, indCallReg, (ssize_t)addrInfo.addr);
+        getEmitter()->emitIns_R_R(INS_mov, EA_PTRSIZE, vptrReg1, indCallReg);
+        getEmitter()->emitIns_R_R_I(INS_ldr, EA_PTRSIZE, indCallReg, indCallReg, 0);
+        getEmitter()->emitIns_R_R_R(INS_add, EA_PTRSIZE, indCallReg, indCallReg, vptrReg1);
+    }
 #endif // _TARGET_ARM64_
 
     if (jmpEpilog)
@@ -8583,7 +8602,7 @@ void CodeGen::genFnEpilog(BasicBlock* block)
                     // LR is used as helper register right before it is restored from stack, thus,
                     // all relative address calculations are performed before LR is restored.
                     callType   = emitter::EC_INDIR_R;
-                    indCallReg = REG_R12;
+                    indCallReg = REG_INDIRECT_CALL_TARGET_REG;
                     addr       = NULL;
 
                     regSet.verifyRegUsed(indCallReg);