From fad970a5ecf82f7af0c3d75c7524dc887e31be65 Mon Sep 17 00:00:00 2001
From: SimplyTheOther <simplytheother@gmail.com>
Date: Sun, 14 Jun 2020 22:16:20 +0800
Subject: Added TI C6X target hook (or a basic one at least)

---
 gcc/config.gcc              |  1 +
 gcc/config/c6x/c6x-protos.h |  3 +++
 gcc/config/c6x/c6x-rust.c   | 56 +++++++++++++++++++++++++++++++++++++++++++++
 gcc/config/c6x/c6x.h        |  2 ++
 gcc/config/c6x/t-c6x        |  4 ++++
 5 files changed, 66 insertions(+)
 create mode 100644 gcc/config/c6x/c6x-rust.c

(limited to 'gcc')

diff --git a/gcc/config.gcc b/gcc/config.gcc
index a9fd6a7..c5c9d8a 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -578,6 +578,7 @@ v850*-*-*)
 	;;
 tic6x-*-*)
 	cpu_type=c6x
+	rust_target_objs="c6x-rust.o"
 	extra_headers="c6x_intrinsics.h"
 	extra_options="${extra_options} c6x/c6x-tables.opt"
 	;;
diff --git a/gcc/config/c6x/c6x-protos.h b/gcc/config/c6x/c6x-protos.h
index 92d6008..e69484d 100644
--- a/gcc/config/c6x/c6x-protos.h
+++ b/gcc/config/c6x/c6x-protos.h
@@ -21,6 +21,9 @@
 #ifndef GCC_C6X_PROTOS_H
 #define GCC_C6X_PROTOS_H
 
+/* Defined in c6x-rust.c  */
+extern void c6x_rust_target_cpu_info (void);
+
 /* Functions defined in c6x.c.  */
 
 #ifdef RTX_CODE
diff --git a/gcc/config/c6x/c6x-rust.c b/gcc/config/c6x/c6x-rust.c
new file mode 100644
index 0000000..351adac
--- /dev/null
+++ b/gcc/config/c6x/c6x-rust.c
@@ -0,0 +1,56 @@
+/* Subroutines for the Rust front end on the TI C6X.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+
+GCC 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 3, or (at your option)
+any later version.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "tm_p.h"
+#include "rust/rust-target.h"
+#include "rust/rust-target-def.h"
+
+/* Implement TARGET_RUST_CPU_INFO for TI C6X targets.  */
+
+void c6x_rust_target_cpu_info(void) {
+    rust_add_target_info("target_arch", "tic6x");
+
+    // llvm seems to have no support for c6x (nor historical support), so names are made up by me
+    // TODO: very subject to change
+    // TODO maybe put in sub-arches as features? idk
+    if (TARGET_DSBT)
+        rust_add_target_info("target_feature", "dsbt");
+    
+    if (TARGET_INSNS_64)
+        rust_add_target_info("target_feature", "c64x");
+    if (TARGET_INSNS_64PLUS)
+        rust_add_target_info("target_feature", "c64x+");
+    if (TARGET_INSNS_67)
+        rust_add_target_info("target_feature", "c67x");
+    if (TARGET_INSNS_67PLUS)
+        rust_add_target_info("target_feature", "c67x+");
+
+    if (TARGET_LDDW)
+        rust_add_target_info("target_feature", "lddw");
+    if (TARGET_STDW)
+        rust_add_target_info("target_feature", "stdw");
+    if (TARGET_MPY32)
+        rust_add_target_info("target_feature", "mpy32");
+    if (TARGET_FP)
+        rust_add_target_info("target_feature", "fp");
+    if (TARGET_FP_EXT)
+        rust_add_target_info("target_feature", "fp-ext");
+}
diff --git a/gcc/config/c6x/c6x.h b/gcc/config/c6x/c6x.h
index d96f12e..e2159ef 100644
--- a/gcc/config/c6x/c6x.h
+++ b/gcc/config/c6x/c6x.h
@@ -114,6 +114,8 @@ extern c6x_cpu_t c6x_arch;
 	}					\
     } while (0)
 
+#define TARGET_RUST_CPU_INFO c6x_rust_target_cpu_info
+
 #define OPTION_DEFAULT_SPECS \
   {"arch", "%{!march=*:-march=%(VALUE)}" }
 
diff --git a/gcc/config/c6x/t-c6x b/gcc/config/c6x/t-c6x
index 7ea6c1d..cbcdfcc 100644
--- a/gcc/config/c6x/t-c6x
+++ b/gcc/config/c6x/t-c6x
@@ -42,3 +42,7 @@ $(srcdir)/config/c6x/c6x-tables.opt: $(srcdir)/config/c6x/genopt.sh \
   $(srcdir)/config/c6x/c6x-isas.def
 	$(SHELL) $(srcdir)/config/c6x/genopt.sh $(srcdir)/config/c6x > \
 		$(srcdir)/config/c6x/c6x-tables.opt
+
+c6x-rust.o: $(srcdir)/config/c6x/c6x-rust.c \
+  $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) $(C_COMMON_H)
+	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $<
-- 
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