[Qemu-devel] [PATCH v2 44/68] target/arm: Add skeleton for T16 decodetree

[Richard Henderson]

Signed-off-by: Richard Henderson <address@hidden>
---
 target/arm/translate.c   |  6 ++++++
 target/arm/Makefile.objs |  6 ++++++
 target/arm/t16.decode    | 20 ++++++++++++++++++++
 3 files changed, 32 insertions(+)
 create mode 100644 target/arm/t16.decode

diff --git a/target/arm/translate.c b/target/arm/translate.c
index 49bab7d863..90d608a2d2 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -7538,6 +7538,7 @@ static int t32_branch24(DisasContext *s, int x)
 #include "decode-a32.inc.c"
 #include "decode-a32-uncond.inc.c"
 #include "decode-t32.inc.c"
+#include "decode-t16.inc.c"
 
 /* Helpers to swap operands for reverse-subtract.  */
 static void gen_rsb(TCGv_i32 dst, TCGv_i32 a, TCGv_i32 b)
@@ -10550,6 +10551,11 @@ static void disas_thumb_insn(DisasContext *s, uint32_t 
insn)
     TCGv_i32 tmp2;
     TCGv_i32 addr;
 
+    if (disas_t16(s, insn)) {
+        return;
+    }
+    /* fall back to legacy decoder */
+
     switch (insn >> 12) {
     case 0: case 1:
 
diff --git a/target/arm/Makefile.objs b/target/arm/Makefile.objs
index 7806b4dac0..cf26c16f5f 100644
--- a/target/arm/Makefile.objs
+++ b/target/arm/Makefile.objs
@@ -43,12 +43,18 @@ target/arm/decode-t32.inc.c: 
$(SRC_PATH)/target/arm/t32.decode $(DECODETREE)
          $(PYTHON) $(DECODETREE) --static-decode disas_t32 -o $@ $<,\
          "GEN", $(TARGET_DIR)$@)
 
+target/arm/decode-t16.inc.c: $(SRC_PATH)/target/arm/t16.decode $(DECODETREE)
+       $(call quiet-command,\
+         $(PYTHON) $(DECODETREE) -w 16 --static-decode disas_t16 -o $@ $<,\
+         "GEN", $(TARGET_DIR)$@)
+
 target/arm/translate-sve.o: target/arm/decode-sve.inc.c
 target/arm/translate.o: target/arm/decode-vfp.inc.c
 target/arm/translate.o: target/arm/decode-vfp-uncond.inc.c
 target/arm/translate.o: target/arm/decode-a32.inc.c
 target/arm/translate.o: target/arm/decode-a32-uncond.inc.c
 target/arm/translate.o: target/arm/decode-t32.inc.c
+target/arm/translate.o: target/arm/decode-t16.inc.c
 
 obj-y += tlb_helper.o debug_helper.o
 obj-y += translate.o op_helper.o
diff --git a/target/arm/t16.decode b/target/arm/t16.decode
new file mode 100644
index 0000000000..e954f61fe4
--- /dev/null
+++ b/target/arm/t16.decode
@@ -0,0 +1,20 @@
+# Thumb1 instructions
+#
+#  Copyright (c) 2019 Linaro, Ltd
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, see <http://www.gnu.org/licenses/>.
+
+#
+# This file is processed by scripts/decodetree.py
+#
-- 
2.17.1