Merge pull request #1342 from DspHack/feature/add_support_for_ti_c6x

Experimental: Add support for the Texas Instruments C6X (TMS320C6000 …

config/arch/c6x.in

@@ -0,0 +1,15 @@
+# c6x specific configuration file
+
+## no-package
+## select ARCH_SUPPORTS_32
+## select ARCH_DEFAULT_32
+## select ARCH_SUPPORTS_EITHER_ENDIAN
+## select ARCH_DEFAULT_LE
+## select ARCH_SUPPORTS_FLAT_FORMAT
+## select ARCH_SUPPORTS_WITH_CPU
+## depends on EXPERIMENTAL
+##
+## help The TI C6x (TMS320C6000) architecture
+## help   https://www.ti.com/processors/digital-signal-processors
+## help   For linux, kernel must be 3.7 or later (or custom)
+

packages/gcc/4.9.4/0033-fix-c6x-internal-compiler-error-and-multilib.patch

@@ -0,0 +1,48 @@
+Internal compiler error and multilib fixes
+Reported upstream:
+https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57295
+
+Fix c6x mulitibs build for uclinux
+Reported by:  Dan Tejada <dan.tejada@cantada.com>
+
+--- a/gcc/config/c6x/c6x.md
++++ b/gcc/config/c6x/c6x.md
+@@ -775,7 +775,7 @@
+ 		       UNSPEC_MISALIGNED_ACCESS))]
+   "TARGET_INSNS_64"
+ {
+-  if (memory_operand (operands[0], <MODE>mode))
++  if (memory_operand (operands[0], <MODE>mode) || volatile_mem_operand (operands[0], <MODE>mode))
+     {
+       emit_insn (gen_movmisalign<mode>_store (operands[0], operands[1]));
+       DONE;
+
+--- a/gcc/config/c6x/predicates.md
++++ b/gcc/config/c6x/predicates.md
+@@ -224,3 +224,16 @@
+       gcc_unreachable ();
+     }
+ })
++
++;; Return 1 if the operand is in volatile memory.  Note that during the
++;; RTL generation phase, memory_operand does not return TRUE for volatile
++;; memory references.  So this function allows us to recognize volatile
++;; references where it's safe.
++(define_predicate "volatile_mem_operand"
++  (and (and (match_code "mem")
++            (match_test "MEM_VOLATILE_P (op)"))
++       (if_then_else (match_test "reload_completed")
++         (match_operand 0 "memory_operand")
++         (if_then_else (match_test "reload_in_progress")
++           (match_test "strict_memory_address_p (mode, XEXP (op, 0))")
++           (match_test "memory_address_p (mode, XEXP (op, 0))")))))
+
+--- a/gcc/config/c6x/t-c6x-uclinux
++++ b/gcc/config/c6x/t-c6x-uclinux
+@@ -1,3 +1,5 @@
++MULTILIB_OPTIONS = march=c674x mbig-endian
++
+ MULTILIB_OSDIRNAMES    = march.c674x=!c674x
+ MULTILIB_OSDIRNAMES   += mbig-endian=!be
+-MULTILIB_OSDIRNAMES   += mbig-endian/march.c674x=!be/c674x
++MULTILIB_OSDIRNAMES   += march.c674x/mbig-endian=!be/c674x

samples/tic6x-uclinux-uclibc/crosstool.config

@@ -0,0 +1,14 @@
+CT_CONFIG_VERSION="3"
+CT_EXPERIMENTAL=y
+CT_ARCH_C6X=y
+CT_OMIT_TARGET_VENDOR=y
+CT_KERNEL_LINUX=y
+CT_MULTILIB=y
+CT_LIBC_UCLIBC=y
+CT_THREADS="linuxthreads"
+CT_UCLIBC_NG_DEVEL_VCS_git=y
+CT_UCLIBC_NG_DEVEL_URL="https://github.com/DspHack/uclibc-ng.git"
+CT_ARCH_BINFMT_FDPIC=y
+CT_CC_LANG_CXX=y
+CT_ARCH_ENDIAN="little"
+

samples/tic6x-uclinux-uclibc/reported.by

@@ -0,0 +1,3 @@
+reporter_name="Dan Tejada <dan.tejada@cantada.com>"
+reporter_url="https://www.cantada.com/"
+reporter_comment="Tested with uclibc and linux kernel from http://linux-c6x.org"

scripts/build/arch/c6x.sh

@@ -0,0 +1,79 @@
+# Compute c6x-specific values
+
+CT_DoArchUClibcConfig() {
+    local cfg="${1}"
+
+    CT_DoArchUClibcSelectArch "${cfg}" "c6x"
+}
+
+CT_DoArchTupleValues() {
+    CT_TARGET_ARCH="tic6x"
+    #binutils does not like uclibc in the tuple
+    if [ "${CT_TARGET_SYS}" = "uclibc" ]; then
+        CT_TARGET_SYS=
+    fi
+}
+
+CT_DoArchUClibcHeaderDir() {
+    local dir_var="${1}"
+    local cflags="${2}"
+
+    # If it is non-default multilib, add a suffix with architecture (reported by gcc)
+    # to the headers installation path.
+    if [ -n "${cflags}" ]; then
+        eval "${dir_var}="$( ${CT_TARGET}-${CT_CC} -print-multiarch ${cflags} )
+    fi
+}
+
+CT_DoArchUClibcCflags() {
+    local cfg="${1}"
+    local cflags="${2}"
+    local f
+
+    # Set default little endian options
+    CT_KconfigDisableOption "ARCH_BIG_ENDIAN" "${cfg}"
+    CT_KconfigDisableOption "ARCH_WANTS_BIG_ENDIAN" "${cfg}"
+    CT_KconfigEnableOption "ARCH_LITTLE_ENDIAN" "${cfg}"
+    CT_KconfigEnableOption "ARCH_WANTS_LITTLE_ENDIAN" "${cfg}"
+
+    # Set arch options based on march switch
+    CT_KconfigDisableOption "CONFIG_TMS320C674X" "${cfg}"
+    CT_KconfigDisableOption "CONFIG_TMS320C64XPLUS" "${cfg}"
+    CT_KconfigDisableOption "CONFIG_TMS320C64X" "${cfg}"
+    CT_KconfigDisableOption "UCLIBC_HAS_FPU" "${cfg}"
+    CT_KconfigEnableOption "CONFIG_GENERIC_C6X" "${cfg}"
+
+    for f in ${cflags}; do
+        case "${f}" in
+            -march=*)
+                case "${f#-march=}" in
+                    c674x)  
+                        CT_KconfigEnableOption "CONFIG_TMS320C674X" "${cfg}"
+                        CT_KconfigEnableOption "UCLIBC_HAS_FPU" "${cfg}"
+                        CT_KconfigDisableOption "CONFIG_GENERIC_C6X" "${cfg}"
+                        ;;
+                    c64x+) 
+                        CT_KconfigEnableOption "CONFIG_TMS320C64XPLUS" "${cfg}"
+                        CT_KconfigDisableOption "CONFIG_GENERIC_C6X" "${cfg}"
+                        ;;
+                    c64x)  
+                        CT_KconfigEnableOption "CONFIG_TMS320C64X" "${cfg}"
+                        CT_KconfigDisableOption "CONFIG_GENERIC_C6X" "${cfg}"
+                        ;;
+                    c67x)
+                        CT_KconfigEnableOption "UCLIBC_HAS_FPU" "${cfg}"
+                        ;;
+                    c62x)
+                        ;;
+                    *)   CT_Abort "Unsupported architecture: ${f#-march=}";;
+                esac
+                ;;
+            -mbig-endian)
+                CT_KconfigEnableOption "ARCH_BIG_ENDIAN" "${cfg}"
+                CT_KconfigEnableOption "ARCH_WANTS_BIG_ENDIAN" "${cfg}"
+                CT_KconfigDisableOption "ARCH_LITTLE_ENDIAN" "${cfg}"
+                CT_KconfigDisableOption "ARCH_WANTS_LITTLE_ENDIAN" "${cfg}"
+                ;;
+        esac
+    done
+}

scripts/build/kernel/linux.sh

@@ -10,7 +10,7 @@ CT_DoKernelTupleValues()
         # should be added here when someone starts to care about them.
         case "${CT_ARCH}" in
             arm*)               CT_TARGET_KERNEL="linux" ;;
-            m68k|xtensa*)       CT_TARGET_KERNEL="uclinux" ;;
+            c6x|m68k|xtensa*)   CT_TARGET_KERNEL="uclinux" ;;
             *)                  CT_Abort "Unsupported no-mmu arch '${CT_ARCH}'"
         esac
     fi