[RFC,v4,29/29] Hexagon build infrastructure

diff --git a/configure b/configure
index e8e8e98..e57eb1b 100755
--- a/configure
+++ b/configure
@@ -7727,6 +7727,12 @@  case "$target_name" in
     bflt="yes"
     mttcg="yes"
   ;;
+  hexagon)
+    TARGET_BASE_ARCH=hexagon
+    TARGET_ABI_DIR=hexagon
+    mttcg=yes
+    target_compiler=$cross_cc_hexagon
+  ;;
   *)
     error_exit "Unsupported target CPU"
   ;;
diff --git a/default-configs/hexagon-linux-user.mak b/default-configs/hexagon-linux-user.mak
new file mode 100644
index 0000000..ad55af0
--- /dev/null
+++ b/default-configs/hexagon-linux-user.mak
@@ -0,0 +1 @@ 
+# Default configuration for hexagon-linux-user
diff --git a/meson.build b/meson.build
index f4d1ab1..f401838 100644
--- a/meson.build
+++ b/meson.build
@@ -485,6 +485,7 @@  disassemblers = {
   'arm' : ['CONFIG_ARM_DIS'],
   'avr' : ['CONFIG_AVR_DIS'],
   'cris' : ['CONFIG_CRIS_DIS'],
+  'hexagon' : ['CONFIG_HEXAGON_DIS'],
   'hppa' : ['CONFIG_HPPA_DIS'],
   'i386' : ['CONFIG_I386_DIS'],
   'x86_64' : ['CONFIG_I386_DIS'],
diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
index 9f1580a..7b5d54b 100755
--- a/scripts/qemu-binfmt-conf.sh
+++ b/scripts/qemu-binfmt-conf.sh
@@ -4,7 +4,7 @@ 
 qemu_target_list="i386 i486 alpha arm armeb sparc sparc32plus sparc64 \
 ppc ppc64 ppc64le m68k mips mipsel mipsn32 mipsn32el mips64 mips64el \
 sh4 sh4eb s390x aarch64 aarch64_be hppa riscv32 riscv64 xtensa xtensaeb \
-microblaze microblazeel or1k x86_64"
+microblaze microblazeel or1k x86_64 hexagon"
 
 i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
 i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
@@ -136,6 +136,10 @@  or1k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\
 or1k_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
 or1k_family=or1k
 
+hexagon_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xa4\x00'
+hexagon_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
+hexagon_family=hexagon
+
 qemu_get_family() {
     cpu=${HOST_ARCH:-$(uname -m)}
     case "$cpu" in
diff --git a/target/hexagon/meson.build b/target/hexagon/meson.build
new file mode 100644
index 0000000..8ff5cf6
--- /dev/null
+++ b/target/hexagon/meson.build
@@ -0,0 +1,178 @@ 
+##
+##  Copyright(c) 2020 Qualcomm Innovation Center, Inc. All Rights Reserved.
+##
+##  This program is free software; you can redistribute it and/or modify
+##  it under the terms of the GNU General Public License as published by
+##  the Free Software Foundation; either version 2 of the License, or
+##  (at your option) any later version.
+##
+##  This program 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 General Public License for more details.
+##
+##  You should have received a copy of the GNU General Public License
+##  along with this program; if not, see <http://www.gnu.org/licenses/>.
+##
+
+hexagon_ss = ss.source_set()
+
+prog_python = import('python').find_installation('python3')
+
+hex_common_py = 'hex_common.py'
+attribs_def_h = meson.current_source_dir() / 'attribs_def.h'
+gen_tcg_h = meson.current_source_dir() / 'gen_tcg.h'
+
+#
+#  Step 1
+#  We use a C program to create semantics_generated.pyinc
+#
+gen_semantics = executable('gen_semantics', 'gen_semantics.c')
+
+semantics = custom_target(
+    'semantics_generated.pyinc',
+    output: 'semantics_generated.pyinc',
+    input: gen_semantics,
+    command: ['@INPUT@', '@OUTPUT@'],
+)
+hexagon_ss.add(semantics)
+
+#
+# Step 2
+# We use Python scripts to generate the following files
+#     shortcode_generated.h
+#     helper_protos_generated.h
+#     tcg_funcs_generated.h
+#     tcg_func_table_generated.h
+#     helper_funcs_generated.h
+#     printinsn_generated.h
+#     op_regs_generated.h
+#     op_attribs_generated.h
+#     opcodes_def_generated.h
+#
+shortcode_h = custom_target(
+    'shortcode_generated.h',
+    output: 'shortcode_generated.h',
+    input: 'gen_shortcode.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, '@OUTPUT@'],
+)
+hexagon_ss.add(shortcode_h)
+
+helper_protos_h = custom_target(
+    'helper_protos_generated.h',
+    output: 'helper_protos_generated.h',
+    input: 'gen_helper_protos.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, gen_tcg_h, '@OUTPUT@'],
+)
+hexagon_ss.add(helper_protos_h)
+
+tcg_funcs_h = custom_target(
+    'tcg_funcs_generated.h',
+    output: 'tcg_funcs_generated.h',
+    input: 'gen_tcg_funcs.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, gen_tcg_h, '@OUTPUT@'],
+)
+hexagon_ss.add(tcg_funcs_h)
+
+tcg_func_table_h = custom_target(
+    'tcg_func_table_generated.h',
+    output: 'tcg_func_table_generated.h',
+    input: 'gen_tcg_func_table.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, '@OUTPUT@'],
+)
+hexagon_ss.add(tcg_func_table_h)
+
+helper_funcs_h = custom_target(
+    'helper_funcs_generated.h',
+    output: 'helper_funcs_generated.h',
+    input: 'gen_helper_funcs.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, gen_tcg_h, '@OUTPUT@'],
+)
+hexagon_ss.add(helper_funcs_h)
+
+printinsn_h = custom_target(
+    'printinsn_generated.h',
+    output: 'printinsn_generated.h',
+    input: 'gen_printinsn.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, '@OUTPUT@'],
+)
+hexagon_ss.add(printinsn_h)
+
+op_regs_h = custom_target(
+    'op_regs_generated.h',
+    output: 'op_regs_generated.h',
+    input: 'gen_op_regs.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, '@OUTPUT@'],
+)
+hexagon_ss.add(op_regs_h)
+
+op_attribs_h = custom_target(
+    'op_attribs_generated.h',
+    output: 'op_attribs_generated.h',
+    input: 'gen_op_attribs.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, '@OUTPUT@'],
+)
+hexagon_ss.add(op_attribs_h)
+
+opcodes_def_h = custom_target(
+    'opcodes_def_generated.h',
+    output: 'opcodes_def_generated.h',
+    input: 'gen_opcodes_def.py',
+    depend_files: [hex_common_py],
+    command: [prog_python, '@INPUT@', semantics, attribs_def_h, '@OUTPUT@'],
+)
+hexagon_ss.add(opcodes_def_h)
+
+#
+# Step 3
+# We use a C program to create iset.py which is imported into dectree.py
+# to create the decode tree
+#
+gen_dectree_import = executable('gen_dectree_import', 'gen_dectree_import.c', opcodes_def_h, op_regs_h)
+
+iset_py = custom_target(
+    'iset.py',
+    output: 'iset.py',
+    input: gen_dectree_import,
+    command: ['@INPUT@', '@OUTPUT@'],
+)
+hexagon_ss.add(iset_py)
+
+#
+# Step 4
+# We use the dectree.py script to generate the decode tree header file
+#
+dectree_h = custom_target(
+    'dectree_generated.h',
+    output: 'dectree_generated.h',
+    input: 'dectree.py',
+    depends: [iset_py],
+    command: ['PYTHONPATH=' + meson.current_build_dir(), '@INPUT@', '@OUTPUT@'],
+)
+hexagon_ss.add(dectree_h)
+
+hexagon_ss.add(files(
+    'cpu.c',
+    'translate.c',
+    'op_helper.c',
+    'gdbstub.c',
+    'genptr.c',
+    'reg_fields.c',
+    'decode.c',
+    'iclass.c',
+    'opcodes.c',
+    'printinsn.c',
+    'arch.c',
+    'fma_emu.c',
+    'conv_emu.c',
+))
+
+target_arch += {'hexagon': hexagon_ss}
diff --git a/target/meson.build b/target/meson.build
index 9f0ae93..c35c1e9 100644
--- a/target/meson.build
+++ b/target/meson.build
@@ -2,6 +2,7 @@  subdir('alpha')
 subdir('arm')
 subdir('avr')
 subdir('cris')
+subdir('hexagon')
 subdir('hppa')
 subdir('i386')
 subdir('lm32')