ARM64: Add build infrastructure and initial port of interpreter.

src/Makefile

@@ -48,6 +48,7 @@ CCOPT= -O2 -fomit-frame-pointer
 CCOPT_x86= -march=i686 -msse -msse2 -mfpmath=sse
 CCOPT_x64=
 CCOPT_arm=
+CCOPT_arm64=
 CCOPT_ppc=
 CCOPT_ppcspe=
 CCOPT_mips=
@@ -217,6 +218,9 @@ else
 ifneq (,$(findstring LJ_TARGET_ARM ,$(TARGET_TESTARCH)))
   TARGET_LJARCH= arm
 else
+ifneq (,$(findstring LJ_TARGET_ARM64 ,$(TARGET_TESTARCH)))
+  TARGET_LJARCH= arm64
+else
 ifneq (,$(findstring LJ_TARGET_PPC ,$(TARGET_TESTARCH)))
   TARGET_LJARCH= ppc
 else
@@ -236,6 +240,7 @@ endif
 endif
 endif
 endif
+endif
 
 ifneq (,$(findstring LJ_TARGET_PS3 1,$(TARGET_TESTARCH)))
   TARGET_SYS= PS3
@@ -402,7 +407,9 @@ ifeq (Windows,$(TARGET_SYS))
   DASM_AFLAGS+= -D WIN
 endif
 ifeq (x64,$(TARGET_LJARCH))
-  DASM_ARCH= x86
+  ifeq (,$(findstring LJ_FR2 1,$(TARGET_TESTARCH)))
+    DASM_ARCH= x86
+  endif
 else
 ifeq (arm,$(TARGET_LJARCH))
   ifeq (iOS,$(TARGET_SYS))

src/host/buildvm.c

@@ -59,6 +59,8 @@ static int collect_reloc(BuildCtx *ctx, uint8_t *addr, int idx, int type);
 #include "../dynasm/dasm_x86.h"
 #elif LJ_TARGET_ARM
 #include "../dynasm/dasm_arm.h"
+#elif LJ_TARGET_ARM64
+#include "../dynasm/dasm_arm64.h"
 #elif LJ_TARGET_PPC
 #include "../dynasm/dasm_ppc.h"
 #elif LJ_TARGET_PPCSPE

src/host/buildvm_asm.c

@@ -121,6 +121,15 @@ static void emit_asm_wordreloc(BuildCtx *ctx, uint8_t *p, int n,
 	    ins, sym);
     exit(1);
   }
+#elif LJ_TARGET_ARM64
+  if ((ins >> 26) == 0x25u) {
+    fprintf(ctx->fp, "\tbl %s\n", sym);
+  } else {
+    fprintf(stderr,
+	    "Error: unsupported opcode %08x for %s symbol relocation.\n",
+	    ins, sym);
+    exit(1);
+  }
 #elif LJ_TARGET_PPC || LJ_TARGET_PPCSPE
 #if LJ_TARGET_PS3
 #define TOCPREFIX "."

src/lib_jit.c

@@ -695,6 +695,8 @@ static uint32_t jit_cpudetect(lua_State *L)
 	   ver >= 60 ? JIT_F_ARMV6_ : 0;
   flags |= LJ_ARCH_HASFPU == 0 ? 0 : ver >= 70 ? JIT_F_VFPV3 : JIT_F_VFPV2;
 #endif
+#elif LJ_TARGET_ARM64
+  /* No optional CPU features to detect (for now). */
 #elif LJ_TARGET_PPC
 #if LJ_HASJIT
 #if LJ_ARCH_SQRT

src/lj_arch.h

@@ -19,12 +19,14 @@
 #define LUAJIT_ARCH_x64		2
 #define LUAJIT_ARCH_ARM		3
 #define LUAJIT_ARCH_arm		3
-#define LUAJIT_ARCH_PPC		4
-#define LUAJIT_ARCH_ppc		4
-#define LUAJIT_ARCH_PPCSPE	5
-#define LUAJIT_ARCH_ppcspe	5
-#define LUAJIT_ARCH_MIPS	6
-#define LUAJIT_ARCH_mips	6
+#define LUAJIT_ARCH_ARM64	4
+#define LUAJIT_ARCH_arm64	4
+#define LUAJIT_ARCH_PPC		5
+#define LUAJIT_ARCH_ppc		6
+#define LUAJIT_ARCH_PPCSPE	6
+#define LUAJIT_ARCH_ppcspe	6
+#define LUAJIT_ARCH_MIPS	7
+#define LUAJIT_ARCH_mips	7
 
 /* Target OS. */
 #define LUAJIT_OS_OTHER		0
@@ -43,6 +45,8 @@
 #define LUAJIT_TARGET	LUAJIT_ARCH_X64
 #elif defined(__arm__) || defined(__arm) || defined(__ARM__) || defined(__ARM)
 #define LUAJIT_TARGET	LUAJIT_ARCH_ARM
+#elif defined(__aarch64__)
+#define LUAJIT_TARGET	LUAJIT_ARCH_ARM64
 #elif defined(__ppc__) || defined(__ppc) || defined(__PPC__) || defined(__PPC) || defined(__powerpc__) || defined(__powerpc) || defined(__POWERPC__) || defined(__POWERPC) || defined(_M_PPC)
 #ifdef __NO_FPRS__
 #define LUAJIT_TARGET	LUAJIT_ARCH_PPCSPE
@@ -191,6 +195,24 @@
 #define LJ_ARCH_VERSION		50
 #endif
 
+#elif LUAJIT_TARGET == LUAJIT_ARCH_ARM64
+
+#define LJ_ARCH_NAME		"arm64"
+#define LJ_ARCH_BITS		64
+#define LJ_ARCH_ENDIAN		LUAJIT_LE
+#define LJ_TARGET_ARM64		1
+#define LJ_TARGET_EHRETREG	0
+#define LJ_TARGET_JUMPRANGE	27	/* +-2^27 = +-128MB */
+#define LJ_TARGET_MASKSHIFT	1
+#define LJ_TARGET_MASKROT	1
+#define LJ_TARGET_UNIFYROT	2	/* Want only IR_BROR. */
+#define LJ_TARGET_GC64		1
+#define LJ_ARCH_NUMMODE		LJ_NUMMODE_DUAL
+#define LJ_ARCH_NOFFI		1	/* NYI */
+#define LJ_ARCH_NOJIT		1	/* NYI */
+
+#define LJ_ARCH_VERSION		80
+
 #elif LUAJIT_TARGET == LUAJIT_ARCH_PPC
 
 #define LJ_ARCH_NAME		"ppc"
@@ -327,6 +349,13 @@
 #if !(__ARM_EABI__ || LJ_TARGET_IOS)
 #error "Only ARM EABI or iOS 3.0+ ABI is supported"
 #endif
+#elif LJ_TARGET_ARM64
+#if defined(__AARCH64EB__)
+#error "No support for big-endian ARM64"
+#endif
+#if defined(_ILP32)
+#error "No support for ILP32 model on ARM64"
+#endif
 #elif LJ_TARGET_PPC || LJ_TARGET_PPCSPE
 #if defined(_SOFT_FLOAT) || defined(_SOFT_DOUBLE)
 #error "No support for PowerPC CPUs without double-precision FPU"

src/lj_frame.h

@@ -159,6 +159,15 @@ enum { LJ_CONT_TAILCALL, LJ_CONT_FFI_CALLBACK };  /* Special continuations. */
 #define CFRAME_SIZE		64
 #endif
 #define CFRAME_SHIFT_MULTRES	3
+#elif LJ_TARGET_ARM64
+#define CFRAME_OFS_ERRF		196
+#define CFRAME_OFS_NRES		200
+#define CFRAME_OFS_PREV		160
+#define CFRAME_OFS_L		176
+#define CFRAME_OFS_PC		168
+#define CFRAME_OFS_MULTRES	192
+#define CFRAME_SIZE		208
+#define CFRAME_SHIFT_MULTRES	3
 #elif LJ_TARGET_PPC
 #if LJ_TARGET_XBOX360
 #define CFRAME_OFS_ERRF		424

src/lj_vm.h

@@ -50,7 +50,7 @@ LJ_ASMF void lj_vm_exit_handler(void);
 LJ_ASMF void lj_vm_exit_interp(void);
 
 /* Internal math helper functions. */
-#if LJ_TARGET_PPC
+#if LJ_TARGET_PPC || LJ_TARGET_ARM64
 #define lj_vm_floor	floor
 #define lj_vm_ceil	ceil
 #else
@@ -77,7 +77,7 @@ LJ_ASMF void lj_vm_powi_sse(void);
 #else
 LJ_ASMF double lj_vm_powi(double, int32_t);
 #endif
-#if LJ_TARGET_PPC
+#if LJ_TARGET_PPC || LJ_TARGET_ARM64
 #define lj_vm_trunc	trunc
 #else
 LJ_ASMF double lj_vm_trunc(double);

src/lj_vmmath.c

@@ -73,7 +73,7 @@ double lj_vm_exp2(double a)
 }
 #endif
 
-#if !(LJ_TARGET_ARM || LJ_TARGET_PPC)
+#if !(LJ_TARGET_ARM || LJ_TARGET_ARM64 || LJ_TARGET_PPC)
 int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b)
 {
   uint32_t y, ua, ub;