Added PDP-11 target hook (or provisional one at least)

5 files changed, 68 insertions, 0 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 571ce1a..6a006ef 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -2855,6 +2855,7 @@ or1k*-*-*)
 pdp11-*-*)
 	tm_file="${tm_file} newlib-stdint.h"
 	use_gcc_stdint=wrap
+	rust_target_objs="pdp11-rust.o"
 	;;
 # port not yet contributed
 #powerpc-*-openbsd*)
diff --git a/gcc/config/pdp11/pdp11-protos.h b/gcc/config/pdp11/pdp11-protos.h
index 855ec756..e94bdf6 100644
--- a/gcc/config/pdp11/pdp11-protos.h
+++ b/gcc/config/pdp11/pdp11-protos.h
@@ -55,3 +55,6 @@ extern void pdp11_gen_int_label (char *, const char *, int);
 extern void pdp11_output_labelref (FILE *, const char *);
 extern void pdp11_output_def (FILE *, const char *, const char *);
 extern void pdp11_output_addr_vec_elt (FILE *, int);
+
+/* Routines implemented in pdp11-rust.c  */
+extern void pdp11_rust_target_cpu_info (void);
diff --git a/gcc/config/pdp11/pdp11-rust.c b/gcc/config/pdp11/pdp11-rust.c
new file mode 100644
index 0000000..270fcc0
--- /dev/null
+++ b/gcc/config/pdp11/pdp11-rust.c
@@ -0,0 +1,59 @@
+/* Subroutines for the Rust front end for the PDP-11 architecture.
+   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 PDP-11 targets.  */
+
+void pdp11_rust_target_cpu_info(void) {
+    rust_add_target_info("target_arch", "pdp11");
+
+    // names made up by me (as no apparent current nor historical llvm support), based on gcc options
+    /* TODO: figure out how to get data for linker-opt, nosnake - not defined in variable, apparently */
+    if (TARGET_AC0) 
+        rust_add_target_info("target_feature", "ac0");
+    if (TARGET_DEC_ASM)
+        rust_add_target_info("target_feature", "dec-asm");
+    if (TARGET_GNU_ASM)
+        rust_add_target_info("target_feature", "gnu-asm");
+    if (TARGET_UNIX_ASM) 
+        rust_add_target_info("target_feature", "unix-asm");
+    if (TARGET_FPU)
+        rust_add_target_info("target_feature", "fpu");
+    else
+        rust_add_target_info("target_feature", "soft-float");
+    if (TARGET_INT32)
+        rust_add_target_info("target_feature", "int32");
+    else
+        rust_add_target_info("target_feature", "int16");
+    if (TARGET_SPLIT)
+        rust_add_target_info("target_feature", "split");
+    if (TARGET_LRA)
+        rust_add_target_info("target_feature", "lra");
+
+    // defines for generating -40 and -45 code - TODO should -45 imply -40 as well? -10 seems implicit
+    if (TARGET_40) 
+        rust_add_target_info("target_feature", "pa-risc-1-1");
+    if (TARGET_45) 
+        rust_add_target_info("target_feature", "pa-risc-2-0");
+}
diff --git a/gcc/config/pdp11/pdp11.h b/gcc/config/pdp11/pdp11.h
index aedeb73..ae2af37 100644
--- a/gcc/config/pdp11/pdp11.h
+++ b/gcc/config/pdp11/pdp11.h
@@ -49,6 +49,7 @@ along with GCC; see the file COPYING3.  If not see
     }						\
   while (0)
 
+#define TARGET_RUST_CPU_INFO pdp11_rust_target_cpu_info
 
 /* Generate DBX debugging information.  */
 
diff --git a/gcc/config/pdp11/t-pdp11 b/gcc/config/pdp11/t-pdp11
index bdd8d70..a507c53 100644
--- a/gcc/config/pdp11/t-pdp11
+++ b/gcc/config/pdp11/t-pdp11
@@ -29,3 +29,7 @@ CRTSTUFF_T_CFLAGS = -Os
 # We could say "-Werror -Wno-error=type-limits", alas, not all supported
 # gcc bootstrap compilers support the latter option.
 dwarf2out.o-warn = -Wno-error
+
+pdp11-rust.o: $(srcdir)/config/pdp11/pdp11-rust.c \
+  $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) $(C_COMMON_H)
+	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $<