sh2 drc: add aarch64 backend for A64

Makefile

@@ -49,15 +49,18 @@ asm_cdmemory ?= 1
 asm_mix ?= 1
 asm_32xdraw ?= 1
 asm_32xmemory ?= 1
-else # if not arm
+else ifneq (,$(findstring 86,$(ARCH)))
 use_fame ?= 1
 use_cz80 ?= 1
-ifneq (,$(findstring 86,$(ARCH)))
 use_sh2drc ?= 1
-endif
-ifneq (,$(findstring mips,$(ARCH)))
+else ifneq (,$(findstring mips,$(ARCH)))
+use_fame ?= 1
+use_cz80 ?= 1
+use_sh2drc ?= 1
+else ifneq (,$(findstring aarch64,$(ARCH)))
+use_fame ?= 1
+use_cz80 ?= 1
 use_sh2drc ?= 1
-endif
 endif
 
 -include Makefile.local
@@ -247,7 +250,7 @@ pico/carthw_cfg.c: pico/carthw.cfg
 
 # random deps
 pico/carthw/svp/compiler.o : cpu/drc/emit_arm.c
-cpu/sh2/compiler.o : cpu/drc/emit_arm.c
+cpu/sh2/compiler.o : cpu/drc/emit_arm.c cpu/drc/emit_arm64.c
 cpu/sh2/compiler.o : cpu/drc/emit_x86.c cpu/drc/emit_mips.c
 cpu/sh2/mame/sh2pico.o : cpu/sh2/mame/sh2.c
 pico/pico.o pico/cd/mcd.o pico/32x/32x.o : pico/pico_cmn.c pico/pico_int.h

config.aarch64

@@ -0,0 +1,15 @@
+# Automatically generated by configure
+# Configured with: './configure' '--platform=generic'
+CC = aarch64-linux-gnu-gcc
+CXX = aarch64-linux-gnu-g++
+AS = aarch64-linux-gnu-as
+STRIP = aarch64-linux-gnu-strip
+CFLAGS += -I/usr/include/SDL
+CFLAGS += -D_GNU_SOURCE=1 -D_REENTRANT -Wno-unused-result -fno-stack-protector
+ASFLAGS += 
+LDFLAGS += 
+LDLIBS += -lSDL -lasound -lpng -lz -lm -lstdc++ -ldl
+
+ARCH = aarch64
+PLATFORM = generic
+SOUND_DRIVERS = alsa

cpu/sh2/compiler.c

@@ -466,6 +466,56 @@ static cache_reg_t cache_regs[] = {
   {  7, HRF_REG },
 };
 
+#elif defined(__aarch64__)
+#include "../drc/emit_arm64.c"
+
+static guest_reg_t guest_regs[] = {
+  // SHR_R0 .. SHR_SP
+  { GRF_STATIC,20 }, { GRF_STATIC,21 }, { 0 }            , { 0 }            ,
+  { 0 }            , { 0 }            , { 0 }            , { 0 }            ,
+  { 0 }            , { 0 }            , { 0 }            , { 0 }            ,
+  { 0 }            , { 0 }            , { 0 }            , { 0 }            ,
+  // SHR_PC,  SHR_PPC, SHR_PR,   SHR_SR,
+  // SHR_GBR, SHR_VBR, SHR_MACH, SHR_MACL,
+  { 0 }            , { 0 }            , { 0 }            , { GRF_STATIC, 22 },
+  { 0 }            , { 0 }            , { 0 }            , { 0 }            ,
+};
+
+// AAPCS64: params: r0-r7, return: r0-r1, temp: r8-r17, saved: r19-r29
+// saved: r18 (for platform use)
+// since drc never needs more than 4 parameters, r4-r7 are treated as temp.
+static cache_reg_t cache_regs[] = {
+  { 17, HRF_TEMP }, // temps
+  { 16, HRF_TEMP },
+  { 15, HRF_TEMP },
+  { 14, HRF_TEMP },
+  { 13, HRF_TEMP },
+  { 12, HRF_TEMP },
+  { 11, HRF_TEMP },
+  { 10, HRF_TEMP },
+  {  9, HRF_TEMP },
+  {  8, HRF_TEMP },
+  {  7, HRF_TEMP },
+  {  6, HRF_TEMP },
+  {  5, HRF_TEMP },
+  {  4, HRF_TEMP },
+  {  3, HRF_TEMP }, // params
+  {  2, HRF_TEMP },
+  {  1, HRF_TEMP },
+  {  0, HRF_TEMP }, // RET_REG
+  { 22, HRF_LOCKED }, // statics
+  { 21, HRF_LOCKED },
+  { 20, HRF_LOCKED },
+  { 29, HRF_REG }, // other regs
+  { 28, HRF_REG },
+  { 27, HRF_REG },
+  { 26, HRF_REG },
+  { 25, HRF_REG },
+  { 24, HRF_REG },
+  { 23, HRF_REG },
+  { 22, HRF_REG },
+};
+
 #elif defined(__mips__)
 #include "../drc/emit_mips.c"
 

cpu/sh2/compiler.h

@@ -36,6 +36,8 @@ unsigned short scan_block(unsigned int base_pc, int is_slave,
 // XXX MUST match definitions in cpu/sh2/compiler.c
 #if defined(__arm__)
 #define	DRC_SR_REG	r10
+#elif defined(__aarch64__)
+#define	DRC_SR_REG	r22
 #elif defined(__mips__)
 #define	DRC_SR_REG	s6
 #elif defined(__i386__)