From b95a5345ae4217b70ca36f0cced92f68dda7caf5 Mon Sep 17 00:00:00 2001
From: Stuart Monteith <stuart.monteith@arm.com>
Date: Wed, 12 Mar 2014 13:32:32 +0000
Subject: AArch64: Add arm64 runtime support.

Adds support for arm64 to ART. Assembler stubs are sufficient for
down calls into interpreter. JNI compiler and generics are not finished.

Basic Generic JNI functionality.

Change-Id: I4a07c79d1e037b9f5746673480e32cf456867b82
---
 runtime/runtime.cc | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'runtime/runtime.cc')

diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 51edc85..eaa27de 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -30,6 +30,7 @@
 #include <fcntl.h>
 
 #include "arch/arm/registers_arm.h"
+#include "arch/arm64/registers_arm64.h"
 #include "arch/mips/registers_mips.h"
 #include "arch/x86/registers_x86.h"
 #include "arch/x86_64/registers_x86_64.h"
@@ -1035,6 +1036,46 @@ mirror::ArtMethod* Runtime::CreateCalleeSaveMethod(InstructionSet instruction_se
     method->SetFrameSizeInBytes(frame_size);
     method->SetCoreSpillMask(core_spills);
     method->SetFpSpillMask(fp_spills);
+  } else if (instruction_set == kArm64) {
+      // Callee saved registers
+      uint32_t ref_spills = (1 << art::arm64::X19) | (1 << art::arm64::X20) | (1 << art::arm64::X21) |
+                            (1 << art::arm64::X22) | (1 << art::arm64::X23) | (1 << art::arm64::X24) |
+                            (1 << art::arm64::X25) | (1 << art::arm64::X26) | (1 << art::arm64::X27) |
+                            (1 << art::arm64::X28);
+      // X0 is the method pointer. Not saved.
+      uint32_t arg_spills = (1 << art::arm64::X1) | (1 << art::arm64::X2) | (1 << art::arm64::X3) |
+                            (1 << art::arm64::X4) | (1 << art::arm64::X5) | (1 << art::arm64::X6) |
+                            (1 << art::arm64::X7);
+      // TODO  This is conservative. Only ALL should include the thread register.
+      // The thread register is not preserved by the aapcs64.
+      // LR is always saved.
+      uint32_t all_spills =  0;  // (1 << art::arm64::LR);
+      uint32_t core_spills = ref_spills | (type == kRefsAndArgs ? arg_spills : 0) |
+                             (type == kSaveAll ? all_spills : 0) | (1 << art::arm64::FP)
+                             | (1 << art::arm64::X18) | (1 << art::arm64::LR);
+
+      // Save callee-saved floating point registers. Rest are scratch/parameters.
+      uint32_t fp_arg_spills = (1 << art::arm64::D0) | (1 << art::arm64::D1) | (1 << art::arm64::D2) |
+                            (1 << art::arm64::D3) | (1 << art::arm64::D4) | (1 << art::arm64::D5) |
+                            (1 << art::arm64::D6) | (1 << art::arm64::D7);
+      uint32_t fp_ref_spills = (1 << art::arm64::D8)  | (1 << art::arm64::D9)  | (1 << art::arm64::D10) |
+                               (1 << art::arm64::D11)  | (1 << art::arm64::D12)  | (1 << art::arm64::D13) |
+                               (1 << art::arm64::D14)  | (1 << art::arm64::D15);
+      uint32_t fp_all_spills = fp_arg_spills |
+                          (1 << art::arm64::D16)  | (1 << art::arm64::D17) | (1 << art::arm64::D18) |
+                          (1 << art::arm64::D19)  | (1 << art::arm64::D20) | (1 << art::arm64::D21) |
+                          (1 << art::arm64::D22)  | (1 << art::arm64::D23) | (1 << art::arm64::D24) |
+                          (1 << art::arm64::D25)  | (1 << art::arm64::D26) | (1 << art::arm64::D27) |
+                          (1 << art::arm64::D28)  | (1 << art::arm64::D29) | (1 << art::arm64::D30) |
+                          (1 << art::arm64::D31);
+      uint32_t fp_spills = fp_ref_spills | (type == kRefsAndArgs ? fp_arg_spills: 0)
+                          | (type == kSaveAll ? fp_all_spills : 0);
+      size_t frame_size = RoundUp((__builtin_popcount(core_spills) /* gprs */ +
+                                   __builtin_popcount(fp_spills) /* fprs */ +
+                                   1 /* Method* */) * kPointerSize, kStackAlignment);
+      method->SetFrameSizeInBytes(frame_size);
+      method->SetCoreSpillMask(core_spills);
+      method->SetFpSpillMask(fp_spills);
   } else {
     UNIMPLEMENTED(FATAL) << instruction_set;
   }
-- 
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