Added C-SKY target hook (at least provisional one)

5 files changed, 93 insertions, 1 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index f564320..558acce 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1529,7 +1529,7 @@ cr16-*-elf)
         tm_file="elfos.h ${tm_file} newlib-stdint.h"
         tmake_file="${tmake_file} cr16/t-cr16 "
         use_collect2=no
-		rust_target_objs="cr16-rust.o"
+        rust_target_objs="cr16-rust.o"
         ;;
 cris-*-elf | cris-*-none)
 	tm_file="dbxelf.h elfos.h newlib-stdint.h ${tm_file}"
@@ -1605,6 +1605,7 @@ csky-*-*)
 		exit 1
 		;;
 	esac
+	rust_target_objs="csky-rust.o"
 	;;
 epiphany-*-elf | epiphany-*-rtems*)
 	tm_file="${tm_file} dbxelf.h elfos.h"
diff --git a/gcc/config/csky/csky-protos.h b/gcc/config/csky/csky-protos.h
index 2c02399..37d12f4 100644
--- a/gcc/config/csky/csky-protos.h
+++ b/gcc/config/csky/csky-protos.h
@@ -27,6 +27,8 @@ extern bool csky_legitimate_pic_operand_p (rtx);
 
 extern void csky_cpu_cpp_builtins (cpp_reader *);
 
+extern void csky_rust_target_cpu_info (void);
+
 extern bool csky_inlinable_constant (HOST_WIDE_INT value);
 extern bool csky_shifted_imm8_constant (unsigned HOST_WIDE_INT,
 					unsigned int *, unsigned int *);
diff --git a/gcc/config/csky/csky-rust.c b/gcc/config/csky/csky-rust.c
new file mode 100644
index 0000000..16dd7b2
--- /dev/null
+++ b/gcc/config/csky/csky-rust.c
@@ -0,0 +1,83 @@
+/* Subroutines for the Rust front end for C-SKY targets.
+   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 C-SKY targets.  */
+
+void cris_rust_target_cpu_info(void) {
+    rust_add_target_info("target_arch", "csky");
+
+    // llvm seems to have no support for sky (nor historical support), so names are made up by me
+    // TODO: very subject to change
+    // TODO maybe put in sub-arches as features? idk. might be useful in this case 
+    if (TARGET_HARD_FLOAT)
+        rust_add_target_info("target_feature", "hard-float");
+    else
+        rust_add_target_info("target_feature", "soft-float");
+    if (TARGET_DOUBLE_FLOAT)
+        rust_add_target_info("target_feature", "double-float");
+    if (TARGET_FDIVDU)
+        rust_add_target_info("target_feature", "fdivdu");
+    if (TARGET_ELRW)
+        rust_add_target_info("target_feature", "elrw");
+    if (TARGET_ISTACK)
+        rust_add_target_info("target_feature", "istack");
+    if (TARGET_MP)
+        rust_add_target_info("target_feature", "mp");
+    if (TARGET_CP)
+        rust_add_target_info("target_feature", "cp");
+    if (TARGET_CACHE)
+        rust_add_target_info("target_feature", "cache");
+    if (TARGET_SECURITY)
+        rust_add_target_info("target_feature", "security"); // maybe also add define for "mac"?
+    if (TARGET_TRUST)
+        rust_add_target_info("target_feature", "trust");
+    if (TARGET_DSP)
+        rust_add_target_info("target_feature", "dsp");
+    if (TARGET_EDSP)
+        rust_add_target_info("target_feature", "edsp");
+    if (TARGET_VDSP)
+        rust_add_target_info("target_feature", "vdsp");
+    if (TARGET_DIV)
+        rust_add_target_info("target_feature", "div");
+    if (TARGET_MINI_REGISTERS)
+        rust_add_target_info("target_feature", "smart");
+    if (TARGET_HIGH_REGISTERS)
+        rust_add_target_info("target_feature", "high-registers");
+    if (TARGET_ANCHOR)
+        rust_add_target_info("target_feature", "anchor");
+    if (TARGET_PUSHPOP)
+        rust_add_target_info("target_feature", "pushpop");
+    if (TARGET_MULTIPLE_STLD)
+        rust_add_target_info("target_feature", "multiple-stld"); // maybe also add define for "stm"?
+    if (TARGET_CONSTANT_POOL)
+        rust_add_target_info("target_feature", "constpool");
+    if (TARGET_STACK_SIZE)
+        rust_add_target_info("target_feature", "stack-size");
+    if (TARGET_LIBCCRT)
+        rust_add_target_info("target_feature", "ccrt");
+    // maybe have branch cost as target feature? but kind of doesn't really fit as "define"
+    if (flag_sched_prolog)
+        rust_add_target_info("target_feature", "sched-prolog");
+}
diff --git a/gcc/config/csky/csky.h b/gcc/config/csky/csky.h
index 190a668..5461c2a 100644
--- a/gcc/config/csky/csky.h
+++ b/gcc/config/csky/csky.h
@@ -704,6 +704,8 @@ extern enum reg_class regno_reg_class[FIRST_PSEUDO_REGISTER];
 #define TARGET_CPU_CPP_BUILTINS()		      \
   csky_cpu_cpp_builtins (pfile)
 
+#define TARGET_RUST_CPU_INFO csky_rust_target_cpu_info
+
 /******************************************************************
  *			Per-function Data			  *
  ******************************************************************/
diff --git a/gcc/config/csky/t-csky b/gcc/config/csky/t-csky
index ab38fd6..64137a6 100644
--- a/gcc/config/csky/t-csky
+++ b/gcc/config/csky/t-csky
@@ -27,3 +27,7 @@ $(srcdir)/config/csky/csky_tables.opt: $(srcdir)/config/csky/csky_genopt.sh \
   $(srcdir)/config/csky/csky_cores.def
 	$(SHELL) $(srcdir)/config/csky/csky_genopt.sh $(srcdir)/config/csky > \
 		$(srcdir)/config/csky/csky_tables.opt
+
+csky-rust.o: $(srcdir)/config/csky/csky-rust.c \
+  $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) $(C_COMMON_H)
+	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $<