new arm64 backend, yeepee

arm64/targ.c

@@ -0,0 +1,51 @@
+#include "all.h"
+
+int arm64_rsave[] = {
+	R0,  R1,  R2,  R3,  R4,  R5,  R6,  R7,
+	R8,  R9,  R10, R11, R12, R13, R14, R15,
+	IP0, IP1, R18,
+	V0,  V1,  V2,  V3,  V4,  V5,  V6,  V7,
+	V16, V17, V18, V19, V20, V21, V22, V23,
+	V24, V25, V26, V27, V28, V29, V30,
+	-1
+};
+int arm64_rclob[] = {
+	R19, R20, R21, R22, R23, R24, R25, R26,
+	R27, R28,
+	V8,  V9,  V10, V11, V12, V13, V14, V15,
+	-1
+};
+
+#define RGLOB (BIT(FP) | BIT(SP) | BIT(R18))
+
+static int
+arm64_memargs(int op)
+{
+	(void)op;
+	return 0;
+}
+
+Target T_arm64 = {
+	.gpr0 = R0,
+	.ngpr = NGPR,
+	.fpr0 = V0,
+	.nfpr = NFPR,
+	.rglob = RGLOB,
+	.nrglob = 3,
+	.rsave = arm64_rsave,
+	.nrsave = {NGPS, NFPS},
+	.retregs = arm64_retregs,
+	.argregs = arm64_argregs,
+	.memargs = arm64_memargs,
+	.abi = arm64_abi,
+	.isel = arm64_isel,
+	.emitfn = arm64_emitfn,
+};
+
+MAKESURE(globals_are_not_arguments,
+	(RGLOB & (BIT(R8+1) - 1)) == 0
+);
+MAKESURE(arrays_size_ok,
+	sizeof arm64_rsave == (NGPS+NFPS+1) * sizeof(int) &&
+	sizeof arm64_rclob == (NCLR+1) * sizeof(int)
+);