OpenRISC GCC port

this is the start of a new OpenRISC fsf clean port for gcc.

Todo

These items should be done to get to a point where very basic things compile. DONE - just means something is in place so we can move on not done and tested.

• build infra + basic files - DONE
• register definitions - DONE
• calling conventions - DONE
• memory layout
• load/store - DONE
• moves - DONE
• jump - DONE
• branches - DONE
• tuning
  • ensure varargs are to spec
  • ensure we can return 64-bit values in r11 and r12 - DONE (OOTB)
  • proper support for returning small structs/vectors in regs
  • optional support for frame pointers
  • delay slot - DONE
  • optional support for delay slot
  • correct predicates and constraints - OK

building

Stage 1 build

mkdir build
cd build
../gcc/configure --target=or1k-elf --disable-shared --enable-languages=c --prefix=/home/shorne/work/gnu-toolchain/local
make -j5 all-gcc
make install-gcc

../local/bin/or1k-elf-gcc -S ../gcc/test2.c -fdump-rtl-all

bootstrap tests

Below are some really basic test programs we can compile before we move on to the testsuite to check things. I pulled these from the ggx toolchain porting tutorial.

Verify types

/* Just test some types */
    int myint;
    short myshort;
    double mydouble;

Verify call/return

    int foo(int, int);
    int main()
    {
       return foo (111, 222);
    }

Verify prolog/epilog

    int g;

    int add(int a, int b, int c, int d, int e, int f)
    {
      return a + b + c + d + e + f + g;
    }

    int main()
    {
      g = 7;
      return (add (1, 2, 3, 4, 5, 6));
    }