Have a boehm-gc patch for gcj/rtems

[Jie Liu]

Hi,

For Java(GCJ) being supported on RTEMS, there should be a patch on
RTEMS for boehm-gc which is a component of libgcj.

I add libgcj/boehm-gcsupp.c in cpukit directory under the guidance of
Joel, the content is:

#include <rtems.h>
void *rtems_get_stack_bottom(void)
{
  return (void*)((char *)_Thread_Executing->Start.Initial_stack.area+
    _Thread_Executing->Start.Initial_stack.size);
}

It should be compiled and archived to librtemscpu.a.

As Java HelloWorld compiled by cross gcj for RTEMS can be run without
problem, I think it's time to get this patch reviewed and merged. :)

Best Regards,
Jie


2011/6/12 Jie Liu <lj8175 at gmail.com>:
> Hi,
>
> Java HelloWorld compiled by cross gcj for RTEMS can run without
> problem now, I think it's time for get the boehm-gc patch reviewed and
> merged.  :)  Here is the patch:
>
> Index: mach_dep.c
> ===================================================================
> --- mach_dep.c  (revision 172224)
> +++ mach_dep.c  (working copy)
> @@ -411,7 +411,8 @@
>     word dummy;
>
>  #   if defined(USE_GENERIC_PUSH_REGS)
> -#     ifdef HAVE_BUILTIN_UNWIND_INIT
> +#     if defined(HAVE_BUILTIN_UNWIND_INIT)\
> +         &&!(defined(I386) && defined(RTEMS))
>         /* This was suggested by Richard Henderson as the way to       */
>         /* force callee-save registers and register windows onto       */
>         /* the stack.                                          */
> @@ -437,8 +438,8 @@
>        for (; (char *)i < lim; i++) {
>            *i = 0;
>        }
> -#       if defined(MSWIN32) || defined(MSWINCE) \
> -                  || defined(UTS4) || defined(LINUX) || defined(EWS4800)
> +#       if defined(MSWIN32) || defined(MSWINCE) || defined(UTS4) \
> +           || defined(LINUX) || defined(EWS4800) || defined(RTEMS)
>          (void) setjmp(regs);
>  #       else
>             (void) _setjmp(regs);
> Index: include/private/gcconfig.h
> ===================================================================
> --- include/private/gcconfig.h  (revision 172224)
> +++ include/private/gcconfig.h  (working copy)
> @@ -315,6 +315,11 @@
>  #    define mach_type_known
>  #   endif
>  # endif
> +# if defined(__rtems__) && (defined(i386) || defined(__i386__))
> +#   define I386
> +#   define RTEMS
> +#   define mach_type_known
> +# endif
>  # if defined(NeXT) && defined(mc68000)
>  #   define M68K
>  #   define NEXT
> @@ -1297,6 +1302,17 @@
>  #      define STACKBOTTOM ((ptr_t)0xc0000000)
>  #      define DATAEND  /* not needed */
>  #   endif
> +#   ifdef RTEMS
> +#       define OS_TYPE "RTEMS"
> +#       include <sys/unistd.h>
> +        extern int etext[];
> +        extern int end[];
> +        void *rtems_get_stack_bottom();
> +#       define InitStackBottom rtems_get_stack_bottom()
> +#       define DATASTART ((ptr_t)etext)
> +#       define DATAEND ((ptr_t)end)
> +#       define STACKBOTTOM ((ptr_t)InitStackBottom)
> +#   endif
>  #   ifdef DOS4GW
>  #     define OS_TYPE "DOS4GW"
>       extern long __nullarea;
> @@ -2370,7 +2386,8 @@
>  #   else
>  #     if defined(NEXT) || defined(DOS4GW) || \
>                 (defined(AMIGA) && !defined(GC_AMIGA_FASTALLOC)) || \
> -                (defined(SUNOS5) && !defined(USE_MMAP))
> +                (defined(SUNOS5) && !defined(USE_MMAP)) || \
> +                 defined(RTEMS)
>  #       define GET_MEM(bytes) HBLKPTR((size_t) \
>                                              calloc(1, (size_t)bytes
> + GC_page_size) \
>                                              + GC_page_size-1)
> Index: configure
> ===================================================================
> --- configure   (revision 172224)
> +++ configure   (working copy)
> @@ -14867,6 +14867,8 @@
>     $as_echo "#define _REENTRANT 1" >>confdefs.h
>
>     ;;
> + rtems)
> +    ;;
>  decosf1 | irix | mach | os2 | dce | vxworks)
>     as_fn_error "thread package $THREADS not yet supported" "$LINENO" 5
>     ;;
> Index: os_dep.c
> ===================================================================
> --- os_dep.c    (revision 172224)
> +++ os_dep.c    (working copy)
> @@ -1507,7 +1507,7 @@
>
>  # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) \
>        && !defined(MSWIN32) && !defined(MSWINCE) \
> -       && !defined(MACOS) && !defined(DOS4GW)
> +       && !defined(MACOS) && !defined(DOS4GW) && !defined(RTEMS)
>
>  # ifdef SUNOS4
>     extern caddr_t sbrk();
>
> Best Regards,
> Jie
>
> 2011/6/4 Jie Liu <lj8175 at gmail.com>:
>> Hi,
>>
>> I am working on porting gcj to rtems now, it's a project of GSoC2011.[1]
>> And now, the first step: boehm-gc have been ported,  so I want to get
>> this patch reviewed and merged.
>>
>> And I have filed the FSF Paperwork, the patch has been attached.
>> Thank you for your time.
>>
>> Best Regards,
>> Jie
>>
>> [1]http://socghop.appspot.com/gsoc/org/google/gsoc2011/rtems
>>
>