diff --git a/runtime/vm/compiler/asm_intrinsifier_arm.cc b/runtime/vm/compiler/asm_intrinsifier_arm.cc
index 26a7f91..fdfb79d 100644
--- a/runtime/vm/compiler/asm_intrinsifier_arm.cc
+++ b/runtime/vm/compiler/asm_intrinsifier_arm.cc
@@ -28,14 +28,10 @@
   return -1;
 }
 
-static bool IsABIPreservedRegister(Register reg) {
-  return ((1 << reg) & kAbiPreservedCpuRegs) != 0;
-}
-
 void AsmIntrinsifier::IntrinsicCallPrologue(Assembler* assembler) {
-  ASSERT(IsABIPreservedRegister(CODE_REG));
-  ASSERT(IsABIPreservedRegister(ARGS_DESC_REG));
-  ASSERT(IsABIPreservedRegister(CALLEE_SAVED_TEMP));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CODE_REG));
+  COMPILE_ASSERT(IsAbiPreservedRegister(ARGS_DESC_REG));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CALLEE_SAVED_TEMP));
 
   // Save LR by moving it to a callee saved temporary register.
   assembler->Comment("IntrinsicCallPrologue");
diff --git a/runtime/vm/compiler/asm_intrinsifier_arm64.cc b/runtime/vm/compiler/asm_intrinsifier_arm64.cc
index 14857e9..e218d71 100644
--- a/runtime/vm/compiler/asm_intrinsifier_arm64.cc
+++ b/runtime/vm/compiler/asm_intrinsifier_arm64.cc
@@ -28,19 +28,15 @@
   return -1;
 }
 
-static bool IsABIPreservedRegister(Register reg) {
-  return ((1 << reg) & kAbiPreservedCpuRegs) != 0;
-}
-
 void AsmIntrinsifier::IntrinsicCallPrologue(Assembler* assembler) {
-  ASSERT(IsABIPreservedRegister(CODE_REG));
-  ASSERT(!IsABIPreservedRegister(ARGS_DESC_REG));
-  ASSERT(IsABIPreservedRegister(CALLEE_SAVED_TEMP));
-  ASSERT(IsABIPreservedRegister(CALLEE_SAVED_TEMP2));
-  ASSERT(CALLEE_SAVED_TEMP != CODE_REG);
-  ASSERT(CALLEE_SAVED_TEMP != ARGS_DESC_REG);
-  ASSERT(CALLEE_SAVED_TEMP2 != CODE_REG);
-  ASSERT(CALLEE_SAVED_TEMP2 != ARGS_DESC_REG);
+  COMPILE_ASSERT(IsAbiPreservedRegister(CODE_REG));
+  COMPILE_ASSERT(!IsAbiPreservedRegister(ARGS_DESC_REG));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CALLEE_SAVED_TEMP));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CALLEE_SAVED_TEMP2));
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP != CODE_REG);
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP != ARGS_DESC_REG);
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP2 != CODE_REG);
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP2 != ARGS_DESC_REG);
 
   assembler->Comment("IntrinsicCallPrologue");
   assembler->mov(CALLEE_SAVED_TEMP, LR);
diff --git a/runtime/vm/compiler/asm_intrinsifier_x64.cc b/runtime/vm/compiler/asm_intrinsifier_x64.cc
index ac7112c..f13d41f 100644
--- a/runtime/vm/compiler/asm_intrinsifier_x64.cc
+++ b/runtime/vm/compiler/asm_intrinsifier_x64.cc
@@ -28,16 +28,12 @@
   return 0;
 }
 
-static bool IsABIPreservedRegister(Register reg) {
-  return ((1 << reg) & CallingConventions::kCalleeSaveCpuRegisters) != 0;
-}
-
 void AsmIntrinsifier::IntrinsicCallPrologue(Assembler* assembler) {
-  ASSERT(IsABIPreservedRegister(CODE_REG));
-  ASSERT(!IsABIPreservedRegister(ARGS_DESC_REG));
-  ASSERT(IsABIPreservedRegister(CALLEE_SAVED_TEMP));
-  ASSERT(CALLEE_SAVED_TEMP != CODE_REG);
-  ASSERT(CALLEE_SAVED_TEMP != ARGS_DESC_REG);
+  COMPILE_ASSERT(IsAbiPreservedRegister(CODE_REG));
+  COMPILE_ASSERT(!IsAbiPreservedRegister(ARGS_DESC_REG));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CALLEE_SAVED_TEMP));
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP != CODE_REG);
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP != ARGS_DESC_REG);
 
   assembler->Comment("IntrinsicCallPrologue");
   assembler->movq(CALLEE_SAVED_TEMP, ARGS_DESC_REG);
diff --git a/runtime/vm/compiler/graph_intrinsifier_arm.cc b/runtime/vm/compiler/graph_intrinsifier_arm.cc
index cc8dc4c..1cebb33 100644
--- a/runtime/vm/compiler/graph_intrinsifier_arm.cc
+++ b/runtime/vm/compiler/graph_intrinsifier_arm.cc
@@ -17,14 +17,10 @@
   return -1;
 }
 
-static bool IsABIPreservedRegister(Register reg) {
-  return ((1 << reg) & kAbiPreservedCpuRegs) != 0;
-}
-
 void GraphIntrinsifier::IntrinsicCallPrologue(Assembler* assembler) {
-  ASSERT(IsABIPreservedRegister(CODE_REG));
-  ASSERT(IsABIPreservedRegister(ARGS_DESC_REG));
-  ASSERT(IsABIPreservedRegister(CALLEE_SAVED_TEMP));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CODE_REG));
+  COMPILE_ASSERT(IsAbiPreservedRegister(ARGS_DESC_REG));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CALLEE_SAVED_TEMP));
 
   // Save LR by moving it to a callee saved temporary register.
   assembler->Comment("IntrinsicCallPrologue");
diff --git a/runtime/vm/compiler/graph_intrinsifier_arm64.cc b/runtime/vm/compiler/graph_intrinsifier_arm64.cc
index 9bd2ae5..99d33b4 100644
--- a/runtime/vm/compiler/graph_intrinsifier_arm64.cc
+++ b/runtime/vm/compiler/graph_intrinsifier_arm64.cc
@@ -17,19 +17,15 @@
   return -1;
 }
 
-static bool IsABIPreservedRegister(Register reg) {
-  return ((1 << reg) & kAbiPreservedCpuRegs) != 0;
-}
-
 void GraphIntrinsifier::IntrinsicCallPrologue(Assembler* assembler) {
-  ASSERT(IsABIPreservedRegister(CODE_REG));
-  ASSERT(!IsABIPreservedRegister(ARGS_DESC_REG));
-  ASSERT(IsABIPreservedRegister(CALLEE_SAVED_TEMP));
-  ASSERT(IsABIPreservedRegister(CALLEE_SAVED_TEMP2));
-  ASSERT(CALLEE_SAVED_TEMP != CODE_REG);
-  ASSERT(CALLEE_SAVED_TEMP != ARGS_DESC_REG);
-  ASSERT(CALLEE_SAVED_TEMP2 != CODE_REG);
-  ASSERT(CALLEE_SAVED_TEMP2 != ARGS_DESC_REG);
+  COMPILE_ASSERT(IsAbiPreservedRegister(CODE_REG));
+  COMPILE_ASSERT(!IsAbiPreservedRegister(ARGS_DESC_REG));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CALLEE_SAVED_TEMP));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CALLEE_SAVED_TEMP2));
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP != CODE_REG);
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP != ARGS_DESC_REG);
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP2 != CODE_REG);
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP2 != ARGS_DESC_REG);
 
   assembler->Comment("IntrinsicCallPrologue");
   assembler->mov(CALLEE_SAVED_TEMP, LR);
diff --git a/runtime/vm/compiler/graph_intrinsifier_x64.cc b/runtime/vm/compiler/graph_intrinsifier_x64.cc
index 58c02b2..e1479a8 100644
--- a/runtime/vm/compiler/graph_intrinsifier_x64.cc
+++ b/runtime/vm/compiler/graph_intrinsifier_x64.cc
@@ -17,16 +17,12 @@
   return 0;
 }
 
-static bool IsABIPreservedRegister(Register reg) {
-  return ((1 << reg) & CallingConventions::kCalleeSaveCpuRegisters) != 0;
-}
-
 void GraphIntrinsifier::IntrinsicCallPrologue(Assembler* assembler) {
-  ASSERT(IsABIPreservedRegister(CODE_REG));
-  ASSERT(!IsABIPreservedRegister(ARGS_DESC_REG));
-  ASSERT(IsABIPreservedRegister(CALLEE_SAVED_TEMP));
-  ASSERT(CALLEE_SAVED_TEMP != CODE_REG);
-  ASSERT(CALLEE_SAVED_TEMP != ARGS_DESC_REG);
+  COMPILE_ASSERT(IsAbiPreservedRegister(CODE_REG));
+  COMPILE_ASSERT(!IsAbiPreservedRegister(ARGS_DESC_REG));
+  COMPILE_ASSERT(IsAbiPreservedRegister(CALLEE_SAVED_TEMP));
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP != CODE_REG);
+  COMPILE_ASSERT(CALLEE_SAVED_TEMP != ARGS_DESC_REG);
 
   assembler->Comment("IntrinsicCallPrologue");
   assembler->movq(CALLEE_SAVED_TEMP, ARGS_DESC_REG);
diff --git a/runtime/vm/compiler/stub_code_compiler_arm.cc b/runtime/vm/compiler/stub_code_compiler_arm.cc
index 4bc6aee..5bf87cb 100644
--- a/runtime/vm/compiler/stub_code_compiler_arm.cc
+++ b/runtime/vm/compiler/stub_code_compiler_arm.cc
@@ -350,7 +350,7 @@
 //   NOTFP, R4: clobbered, although normally callee-saved
 void StubCodeCompiler::GenerateCallNativeThroughSafepointStub(
     Assembler* assembler) {
-  COMPILE_ASSERT((kAbiPreservedCpuRegs & (1 << R4)) != 0);
+  COMPILE_ASSERT(IsAbiPreservedRegister(R4));
 
   // TransitionGeneratedToNative might clobber LR if it takes the slow path.
   __ mov(R4, Operand(LR));
@@ -2867,10 +2867,13 @@
 //
 // Notice: We need to keep this in sync with `Simulator::JumpToFrame()`.
 void StubCodeCompiler::GenerateJumpToFrameStub(Assembler* assembler) {
-  ASSERT(kExceptionObjectReg == R0);
-  ASSERT(kStackTraceObjectReg == R1);
+  COMPILE_ASSERT(kExceptionObjectReg == R0);
+  COMPILE_ASSERT(kStackTraceObjectReg == R1);
+  COMPILE_ASSERT(IsAbiPreservedRegister(R4));
+  COMPILE_ASSERT(IsAbiPreservedRegister(THR));
   __ mov(IP, Operand(R1));   // Copy Stack pointer into IP.
-  __ mov(LR, Operand(R0));   // Program counter.
+  // TransitionGeneratedToNative might clobber LR if it takes the slow path.
+  __ mov(R4, Operand(R0));   // Program counter.
   __ mov(THR, Operand(R3));  // Thread.
   __ mov(FP, Operand(R2));   // Frame_pointer.
   __ mov(SP, Operand(IP));   // Set Stack pointer.
@@ -2903,7 +2906,7 @@
   } else {
     __ LoadPoolPointer();
   }
-  __ bx(LR);  // Jump to continuation point.
+  __ bx(R4);  // Jump to continuation point.
 }
 
 // Run an exception handler.  Execution comes from JumpToFrame
diff --git a/runtime/vm/compiler/stub_code_compiler_arm64.cc b/runtime/vm/compiler/stub_code_compiler_arm64.cc
index 1ef8b6a..f98d773 100644
--- a/runtime/vm/compiler/stub_code_compiler_arm64.cc
+++ b/runtime/vm/compiler/stub_code_compiler_arm64.cc
@@ -300,7 +300,7 @@
 //   Stack: preserved, CSP == SP
 void StubCodeCompiler::GenerateCallNativeThroughSafepointStub(
     Assembler* assembler) {
-  COMPILE_ASSERT((1 << R19) & kAbiPreservedCpuRegs);
+  COMPILE_ASSERT(IsAbiPreservedRegister(R19));
 
   __ mov(R19, LR);
   __ LoadImmediate(R10, target::Thread::exit_through_ffi());
@@ -3007,7 +3007,8 @@
 void StubCodeCompiler::GenerateJumpToFrameStub(Assembler* assembler) {
   ASSERT(kExceptionObjectReg == R0);
   ASSERT(kStackTraceObjectReg == R1);
-  __ mov(LR, R0);  // Program counter.
+  // TransitionGeneratedToNative might clobber LR if it takes the slow path.
+  __ mov(CALLEE_SAVED_TEMP, R0);  // Program counter.
   __ mov(SP, R1);  // Stack pointer.
   __ mov(FP, R2);  // Frame_pointer.
   __ mov(THR, R3);
@@ -3042,7 +3043,7 @@
   } else {
     __ LoadPoolPointer();
   }
-  __ ret();  // Jump to continuation point.
+  __ ret(CALLEE_SAVED_TEMP);  // Jump to continuation point.
 }
 
 // Run an exception handler.  Execution comes from JumpToFrame
diff --git a/runtime/vm/constants.h b/runtime/vm/constants.h
index f89abc6..01d9d08 100644
--- a/runtime/vm/constants.h
+++ b/runtime/vm/constants.h
@@ -53,6 +53,12 @@
   return ((1 << reg) & CallingConventions::kCalleeSaveCpuRegisters) != 0;
 }
 
+#if !defined(TARGET_ARCH_IA32)
+constexpr bool IsAbiPreservedRegister(Register reg) {
+  return (kAbiPreservedCpuRegs & (1 << reg)) != 0;
+}
+#endif
+
 }  // namespace dart
 
 #endif  // RUNTIME_VM_CONSTANTS_H_
diff --git a/runtime/vm/constants_x64.h b/runtime/vm/constants_x64.h
index 824a871..480f565 100644
--- a/runtime/vm/constants_x64.h
+++ b/runtime/vm/constants_x64.h
@@ -457,6 +457,9 @@
        (kArgumentRegisters | R(kPointerToReturnStructRegisterCall))) == 0);
 };
 
+constexpr intptr_t kAbiPreservedCpuRegs =
+    CallingConventions::kCalleeSaveCpuRegisters;
+
 #undef R
 
 class Instr {
diff --git a/runtime/vm/runtime_entry_arm.cc b/runtime/vm/runtime_entry_arm.cc
index b2cd9da..0870d45 100644
--- a/runtime/vm/runtime_entry_arm.cc
+++ b/runtime/vm/runtime_entry_arm.cc
@@ -58,8 +58,8 @@
     __ LoadImmediate(TMP, VMTag::kDartTagId);
     __ str(TMP,
            compiler::Address(THR, compiler::target::Thread::vm_tag_offset()));
-    ASSERT((kAbiPreservedCpuRegs & (1 << THR)) != 0);
-    ASSERT((kAbiPreservedCpuRegs & (1 << PP)) != 0);
+    COMPILE_ASSERT(IsAbiPreservedRegister(THR));
+    COMPILE_ASSERT(IsAbiPreservedRegister(PP));
   } else {
     // Argument count is not checked here, but in the runtime entry for a more
     // informative error message.
diff --git a/runtime/vm/runtime_entry_arm64.cc b/runtime/vm/runtime_entry_arm64.cc
index 1580e1a..93a80fd 100644
--- a/runtime/vm/runtime_entry_arm64.cc
+++ b/runtime/vm/runtime_entry_arm64.cc
@@ -73,8 +73,8 @@
     __ str(TMP, compiler::Address(THR, Thread::vm_tag_offset()));
     __ mov(SP, kCallLeafRuntimeCalleeSaveScratch2);
     __ mov(CSP, kCallLeafRuntimeCalleeSaveScratch1);
-    ASSERT((kAbiPreservedCpuRegs & (1 << THR)) != 0);
-    ASSERT((kAbiPreservedCpuRegs & (1 << PP)) != 0);
+    COMPILE_ASSERT(IsAbiPreservedRegister(THR));
+    COMPILE_ASSERT(IsAbiPreservedRegister(PP));
   } else {
     // Argument count is not checked here, but in the runtime entry for a more
     // informative error message.
diff --git a/tests/co19/co19-kernel.status b/tests/co19/co19-kernel.status
index ee639b0..b2c7be3 100644
--- a/tests/co19/co19-kernel.status
+++ b/tests/co19/co19-kernel.status
@@ -13,155 +13,14 @@
 LanguageFeatures/Constant-update-2018/NewOperators_A01_t06/none: Crash
 
 [ $runtime == dart_precompiled ]
-LibTest/io/Process/kill_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/run_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/start_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/start_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/start_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/start_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/start_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/start_A03_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/stderr_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/stdin_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Process/stdout_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/ProcessSignal/watch_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/ProcessSignal/watch_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A02_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A02_t04: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A03_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A03_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A04_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A04_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A04_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A04_t04: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lockSync_A05_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A01_t04: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A02_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A03_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A03_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A04_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A04_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A04_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A04_t04: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/lock_A05_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/unlockSync_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/unlockSync_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/unlockSync_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/unlockSync_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/unlock_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/unlock_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/unlock_A01_t04: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RandomAccessFile/unlock_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawDatagramSocket/join_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawDatagramSocket/join_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawDatagramSocket/join_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawDatagramSocket/multicastInterface_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawDatagramSocket/receive_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawDatagramSocket/reduce_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawDatagramSocket/reduce_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawDatagramSocket/reduce_A04_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawSecureServerSocket/first_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawSecureServerSocket/first_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawSecureServerSocket/first_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawSecureServerSocket/isEmpty_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawSecureServerSocket/last_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawSecureServerSocket/length_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawSecureServerSocket/single_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/RawSecureServerSocket/single_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A01_t04: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A01_t05: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A01_t06: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A01_t07: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/any_A04_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/first_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/first_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/first_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/first_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/first_A03_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/isEmpty_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/isEmpty_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/isEmpty_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/isEmpty_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/last_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/last_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/length_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/length_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readByteSync_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readByteSync_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readByteSync_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readByteSync_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A03_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A03_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A04_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A05_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A05_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/readLineSync_A05_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdin/supportsAnsiEscapes_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/Stdout_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/addError_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/addError_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/addError_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/addError_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/addError_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/addStream_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t04: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t05: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t06: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t07: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t08: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A02_t09: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/add_A04_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/nonBlocking_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/supportsAnsiEscapes_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeAll_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeAll_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeAll_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeAll_A02_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeAll_A02_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeAll_A02_t05: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeAll_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeCharCode_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeCharCode_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/write_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/write_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/write_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/write_A01_t04: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/write_A01_t05: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/write_A01_t07: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/write_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeln_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeln_A01_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeln_A01_t03: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/Stdout/writeln_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/exit/exit_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/exit/exit_A02_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/exit/exit_A03_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/exit/exit_A03_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/exitCode/exitCode_A01_t01: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/exitCode/exitCode_A03_t02: Skip # https://github.com/dart-lang/issues/926
-LibTest/io/stderr/stderr_A01_t01: Skip # https://github.com/dart-lang/issues/926
+LibTest/io/RawDatagramSocket/join_A01_t01: Skip # https://github.com/dart-lang/issues/195
+LibTest/io/RawDatagramSocket/join_A01_t02: Skip # https://github.com/dart-lang/issues/195
+LibTest/io/RawDatagramSocket/join_A02_t01: Skip # https://github.com/dart-lang/issues/195
+LibTest/io/RawDatagramSocket/multicastInterface_A01_t01: Skip # https://github.com/dart-lang/issues/195
+LibTest/io/RawDatagramSocket/receive_A02_t02: Skip # https://github.com/dart-lang/issues/195
+LibTest/io/RawDatagramSocket/reduce_A01_t01: Skip # https://github.com/dart-lang/issues/195
+LibTest/io/RawDatagramSocket/reduce_A02_t02: Skip # https://github.com/dart-lang/issues/195
+LibTest/io/RawDatagramSocket/reduce_A04_t01: Skip # https://github.com/dart-lang/issues/195
 LibTest/mirrors/*: SkipByDesign # dart:mirrors is not supported:
 
 [ $runtime == vm ]
diff --git a/tests/ffi/regress_jump_to_frame_test.dart b/tests/ffi/regress_jump_to_frame_test.dart
new file mode 100644
index 0000000..a3d9054
--- /dev/null
+++ b/tests/ffi/regress_jump_to_frame_test.dart
@@ -0,0 +1,64 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Check that JumpToFrame does not use LR clobbered by slow path of
+// TransitionNativeToGenerated.
+// VMOptions=--use-slow-path --enable-testing-pragmas
+
+import 'dart:ffi';
+
+import 'package:ffi/ffi.dart';
+import 'package:expect/expect.dart';
+
+typedef CallbackDartType = Object Function();
+typedef CallbackNativeType = Handle Function();
+
+Object alwaysThrows() {
+  throw 'exception';
+}
+
+void alwaysCatches(CallbackDartType f) {
+  try {
+    propagateError(f());
+  } catch (e) {
+    Expect.equals('exception', e);
+    return;
+  }
+  Expect.isTrue(false);
+}
+
+void main() {
+  final ptr = Pointer.fromFunction<CallbackNativeType>(alwaysThrows);
+  final f = ptr.asFunction<CallbackDartType>();
+  alwaysCatches(f);
+}
+
+typedef Dart_PropagateError_NativeType = Void Function(Handle);
+typedef Dart_PropagateError_DartType = void Function(Object);
+
+final Dart_PropagateError_DartType propagateError = () {
+  final Pointer<_DartApi> dlapi = NativeApi.initializeApiDLData.cast();
+  for (int i = 0; dlapi.ref.functions[i].name != nullptr; i++) {
+    final name = Utf8.fromUtf8(dlapi.ref.functions[i].name.cast<Utf8>());
+    if (name == 'Dart_PropagateError') {
+      return dlapi.ref.functions[i].function
+          .cast<NativeFunction<Dart_PropagateError_NativeType>>()
+          .asFunction<Dart_PropagateError_DartType>();
+    }
+  }
+  throw 'Not found';
+}();
+
+class _DartEntry extends Struct {
+  external Pointer<Int8> name;
+  external Pointer<Void> function;
+}
+
+class _DartApi extends Struct {
+  @Int32()
+  external int major;
+  @Int32()
+  external int minor;
+  external Pointer<_DartEntry> functions;
+}
diff --git a/tests/ffi_2/regress_jump_to_frame_test.dart b/tests/ffi_2/regress_jump_to_frame_test.dart
new file mode 100644
index 0000000..9838443
--- /dev/null
+++ b/tests/ffi_2/regress_jump_to_frame_test.dart
@@ -0,0 +1,64 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Check that JumpToFrame does not use LR clobbered by slow path of
+// TransitionNativeToGenerated.
+// VMOptions=--use-slow-path --enable-testing-pragmas
+
+import 'dart:ffi';
+
+import 'package:ffi/ffi.dart';
+import 'package:expect/expect.dart';
+
+typedef CallbackDartType = Object Function();
+typedef CallbackNativeType = Handle Function();
+
+Object alwaysThrows() {
+  throw 'exception';
+}
+
+void alwaysCatches(CallbackDartType f) {
+  try {
+    propagateError(f());
+  } catch (e) {
+    Expect.equals('exception', e);
+    return;
+  }
+  Expect.isTrue(false);
+}
+
+void main() {
+  final ptr = Pointer.fromFunction<CallbackNativeType>(alwaysThrows);
+  final f = ptr.asFunction<CallbackDartType>();
+  alwaysCatches(f);
+}
+
+typedef Dart_PropagateError_NativeType = Void Function(Handle);
+typedef Dart_PropagateError_DartType = void Function(Object);
+
+final Dart_PropagateError_DartType propagateError = () {
+  final Pointer<_DartApi> dlapi = NativeApi.initializeApiDLData.cast();
+  for (int i = 0; dlapi.ref.functions[i].name != nullptr; i++) {
+    final name = Utf8.fromUtf8(dlapi.ref.functions[i].name.cast<Utf8>());
+    if (name == 'Dart_PropagateError') {
+      return dlapi.ref.functions[i].function
+          .cast<NativeFunction<Dart_PropagateError_NativeType>>()
+          .asFunction<Dart_PropagateError_DartType>();
+    }
+  }
+  throw 'Not found';
+}();
+
+class _DartEntry extends Struct {
+  Pointer<Int8> name;
+  Pointer<Void> function;
+}
+
+class _DartApi extends Struct {
+  @Int32()
+  int major;
+  @Int32()
+  int minor;
+  Pointer<_DartEntry> functions;
+}
diff --git a/tools/VERSION b/tools/VERSION
index fae61c1..b27aeb5 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
 MAJOR 2
 MINOR 12
 PATCH 0
-PRERELEASE 84
+PRERELEASE 85
 PRERELEASE_PATCH 0
\ No newline at end of file