[PATCH] Rework to minimize and eventually eliminate RTEMS use of bsp_specs

Amaan Cheval amaan.cheval at gmail.com
Mon Jul 9 05:00:23 UTC 2018


To make my previous email clearer, here's what I meant with the
"minimal" GCC patch required (attached).

To manually test, you can place gcc-STARTFILE_SPEC.patch in
$RSB/rtems/patches/ and then "git apply rsb-startfile.diff" to the RSB
repo. Then build GCC and confirm that "x86_64-rtems5-gcc -dumpspecs"
includes crti and crtbegin in the startfile susbtitution.

Let me know if we aim to have this GCC work done before merging the
x86_64 BSP (see
https://lists.rtems.org/pipermail/devel/2018-July/022388.html) so I
can leave bsp_specs in or clear it out accordingly?

For now, I'm going to leave it in.

On Fri, Jul 6, 2018 at 10:46 AM, Amaan Cheval <amaan.cheval at gmail.com> wrote:
> Hey, Joel!
>
> The x86_64 BSP currently uses an empty bsp_specs file contingent on
> (at least the x86-64 parts of) this email thread's patch making it
> upstream to GCC, and making their way into the RSB.
>
> 2 options:
> - 1. Make the upstream GCC commit (at least the parts adding
> rtemself64.h, editing config.gcc, and "#if 0"ing out
> gcc/config/rtems.h)
> - 2. Use a bsp_specs in the new BSP for the merge now, and empty it out later
>
> I can test and send you an x86_64 specific patch for GCC if you'd
> like. Or if you prefer to have all the work together, we can go with
> #2.
>
> Let me know!
>
> On Sat, May 19, 2018 at 3:17 AM, Joel Sherrill <joel at rtems.org> wrote:
>> Thanks. I will try to deal with this Monday.
>>
>> My specs patches are not ready to push to gcc so I need to focus on
>> just the parts to make x86_64 right.
>>
>> On Fri, May 18, 2018 at 3:41 PM, Amaan Cheval <amaan.cheval at gmail.com>
>> wrote:
>>>
>>> To be clear, I applied this patch (with my fixes) on the 7.3 release
>>> through the RSB to test, not on GCC's master branch.
>>>
>>> > to add i386/rtemself64.h
>>>
>>> What you sent in this email thread adds rtemself64.h already. Do you
>>> mean you'd like to split the commits up or something?
>>>
>>> The only changes I made on top of yours were:
>>>
>>> - Readd "rtems.h" to config.gcc
>>> - Fix comments
>>>
>>> I've attached the patch file I used within the RSB here (sorry if you
>>> meant a patch of _just_ the fixes I made on top of yours, this is just
>>> the cumulative diff I used to patch GCC 7.3 to test).
>>>
>>> Regards,
>>>
>>> On Fri, May 18, 2018 at 7:00 PM, Joel Sherrill <joel at rtems.org> wrote:
>>> >
>>> >
>>> >
>>> > On Fri, May 18, 2018 at 1:38 AM, Amaan Cheval <amaan.cheval at gmail.com>
>>> > wrote:
>>> >>
>>> >> I just compiled my local fixed copy (adding rtems.h back in) and
>>> >> there's good news! With the patch, the x86_64 compile stub works with
>>> >> a blank bsp_specs file!
>>> >
>>> >
>>> > Awesome!
>>> >
>>> > Can you send me your changes as a patch? I am thinking I need to make
>>> > sure we agree on what the gcc master for x86_64-rtems looks like.
>>> >
>>> > Apparently I owe committing a patch to add i386/rtemself64.h since it is
>>> > missing on the master. And the comment is wrong.  What else?
>>> >
>>> >> On Fri, May 18, 2018 at 12:59 AM, Amaan Cheval <amaan.cheval at gmail.com>
>>> >> wrote:
>>> >> > Hey!
>>> >> >
>>> >> > Thanks so much for sharing this, it's quite useful to put your
>>> >> > earlier
>>> >> > email[1] about minimzing the bsp_specs in context.
>>> >> >
>>> >> > From looking ahead a bit without testing (still compiling), the patch
>>> >> > may need an ENDFILE_SPEC definition as well for "crtend.o" (it
>>> >> > defines
>>> >> > __TMC_END__ which crtbegin.o has left undefined for eg.) and possibly
>>> >> > "crtn.o", at least to eliminate the x86_64 port's bsp_specs entirely
>>> >> > (see here[2]).
>>> >>
>>> >> Just noticed that ENDFILE_SPEC already includes crtend in i386elf.h,
>>> >> so there's no need for this change.
>>> >>
>>> >> >
>>> >> > I've also left some comments inline below.
>>> >> >
>>> >> > +1 on upstreaming this into GCC (making sure it also backports to 7.3
>>> >> > for simplicity, so we don't need to write a 7.3-specific patch for
>>> >> > the
>>> >> > RSB as well) with a few additons (at least for the x86_64 target, to
>>> >> > try to have an empty bsp_specs to begin with).
>>> >> >
>>> >> > [1] https://lists.rtems.org/pipermail/devel/2018-May/021430.html
>>> >> > [2]
>>> >> >
>>> >> > https://github.com/AmaanC/rtems-gsoc18/blob/ac/daily-01-compile-stub/bsps/x86_64/amd64/start/bsp_specs
>>> >> >
>>> >> > On Wed, May 16, 2018 at 8:46 PM, Joel Sherrill <joel at rtems.org>
>>> >> > wrote:
>>> >> >> ---
>>> >> >>  gcc/config.gcc                |  2 +-
>>> >> >>  gcc/config/arm/rtems.h        |  4 ++++
>>> >> >>  gcc/config/bfin/rtems.h       |  4 ++++
>>> >> >>  gcc/config/i386/rtemself.h    |  6 +++++-
>>> >> >>  gcc/config/i386/rtemself64.h  | 39
>>> >> >> +++++++++++++++++++++++++++++++++++++++
>>> >> >>  gcc/config/m68k/rtemself.h    |  4 ++++
>>> >> >>  gcc/config/microblaze/rtems.h |  4 ++++
>>> >> >>  gcc/config/mips/rtems.h       |  4 ++++
>>> >> >>  gcc/config/moxie/rtems.h      |  4 ++++
>>> >> >>  gcc/config/nios2/rtems.h      |  4 ++++
>>> >> >>  gcc/config/riscv/rtems.h      |  4 ++++
>>> >> >>  gcc/config/rs6000/rtems.h     |  5 +++++
>>> >> >>  gcc/config/rtems.h            |  6 +++++-
>>> >> >>  gcc/config/sh/rtems.h         |  4 ++++
>>> >> >>  gcc/config/sh/rtemself.h      |  4 ++++
>>> >> >>  gcc/config/sparc/rtemself.h   |  4 ++++
>>> >> >>  gcc/config/v850/rtems.h       |  4 ++++
>>> >> >>  17 files changed, 103 insertions(+), 3 deletions(-)
>>> >> >>  create mode 100644 gcc/config/i386/rtemself64.h
>>> >> >>
>>> >> >> diff --git a/gcc/config.gcc b/gcc/config.gcc
>>> >> >> index d509800..de27e5c 100644
>>> >> >> --- a/gcc/config.gcc
>>> >> >> +++ b/gcc/config.gcc
>>> >> >> @@ -1499,7 +1499,7 @@ x86_64-*-elf*)
>>> >> >>         tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h
>>> >> >> newlib-stdint.h i386/i386elf.h i386/x86-64.h"
>>> >> >>         ;;
>>> >> >>  x86_64-*-rtems*)
>>> >> >> -       tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h
>>> >> >> newlib-stdint.h i386/i386elf.h i386/x86-64.h i386/rtemself.h
>>> >> >> rtems.h"
>>> >> >> +       tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h
>>> >> >> newlib-stdint.h i386/i386elf.h i386/x86-64.h i386/rtemself64.h"
>>> >> >
>>> >> > In rebasing with upstream, this commit must have silently mistakenly
>>> >> > also dropped rtems.h (which my patch earlier added to support the
>>> >> > -qrtems, -qnolinkcmds, etc. flags).
>>> >> >
>>> >> >>         ;;
>>> >> >>  i[34567]86-*-rdos*)
>>> >> >>      tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h
>>> >> >> newlib-stdint.h i386/i386elf.h i386/rdos.h"
>>> >> >> diff --git a/gcc/config/arm/rtems.h b/gcc/config/arm/rtems.h
>>> >> >> index 1123f4a..e79ce90 100644
>>> >> >> --- a/gcc/config/arm/rtems.h
>>> >> >> +++ b/gcc/config/arm/rtems.h
>>> >> >> @@ -34,3 +34,7 @@
>>> >> >>      } while (0)
>>> >> >>
>>> >> >>  #define ARM_DEFAULT_SHORT_ENUMS false
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/bfin/rtems.h b/gcc/config/bfin/rtems.h
>>> >> >> index 6a9a41f..28a69b9 100644
>>> >> >> --- a/gcc/config/bfin/rtems.h
>>> >> >> +++ b/gcc/config/bfin/rtems.h
>>> >> >> @@ -31,3 +31,7 @@
>>> >> >>        builtin_assert ("system=rtems");         \
>>> >> >>      }                                          \
>>> >> >>    while (0)
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/i386/rtemself.h b/gcc/config/i386/rtemself.h
>>> >> >> index 65e8dad..3a09354 100644
>>> >> >> --- a/gcc/config/i386/rtemself.h
>>> >> >> +++ b/gcc/config/i386/rtemself.h
>>> >> >> @@ -1,4 +1,4 @@
>>> >> >> -/* Definitions for rtems targeting an ix86 using ELF.
>>> >> >> +/* Definitions for rtems targeting an x86_64 using ELF.
>>> >> >
>>> >> > I think you meant to have this comment in rtemself64.h, which says
>>> >> > ix86 currently?
>>> >> >
>>> >> >>     Copyright (C) 1996-2018 Free Software Foundation, Inc.
>>> >> >>     Contributed by Joel Sherrill (joel at OARcorp.com).
>>> >> >>
>>> >> >> @@ -33,3 +33,7 @@
>>> >> >>         builtin_assert ("system=rtems");        \
>>> >> >>      }                                          \
>>> >> >>    while (0)
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/i386/rtemself64.h
>>> >> >> b/gcc/config/i386/rtemself64.h
>>> >> >> new file mode 100644
>>> >> >> index 0000000..34e5937
>>> >> >> --- /dev/null
>>> >> >> +++ b/gcc/config/i386/rtemself64.h
>>> >> >> @@ -0,0 +1,39 @@
>>> >> >> +/* Definitions for rtems targeting an ix86 using ELF.
>>> >> >
>>> >> > See above.
>>> >> >
>>> >> >> +   Copyright (C) 1996-2018 Free Software Foundation, Inc.
>>> >> >> +   Contributed by Joel Sherrill (joel at OARcorp.com).
>>> >> >> +
>>> >> >> +   This file is part of GCC.
>>> >> >> +
>>> >> >> +   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.
>>> >> >> +
>>> >> >> +   Under Section 7 of GPL version 3, you are granted additional
>>> >> >> +   permissions described in the GCC Runtime Library Exception,
>>> >> >> version
>>> >> >> +   3.1, as published by the Free Software Foundation.
>>> >> >> +
>>> >> >> +   You should have received a copy of the GNU General Public
>>> >> >> License
>>> >> >> and
>>> >> >> +   a copy of the GCC Runtime Library Exception along with this
>>> >> >> program;
>>> >> >> +   see the files COPYING3 and COPYING.RUNTIME respectively.  If
>>> >> >> not,
>>> >> >> see
>>> >> >> +   <http://www.gnu.org/licenses/>.  */
>>> >> >> +
>>> >> >> +/* Specify predefined symbols in preprocessor.  */
>>> >> >> +
>>> >> >> +#define TARGET_OS_CPP_BUILTINS()               \
>>> >> >> +  do                                           \
>>> >> >> +    {                                          \
>>> >> >> +       builtin_define ("__rtems__");           \
>>> >> >> +       builtin_define ("__USE_INIT_FINI__");   \
>>> >> >> +       builtin_assert ("system=rtems");        \
>>> >> >> +    }                                          \
>>> >> >> +  while (0)
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/m68k/rtemself.h b/gcc/config/m68k/rtemself.h
>>> >> >> index e18a06e..6f31aa5 100644
>>> >> >> --- a/gcc/config/m68k/rtemself.h
>>> >> >> +++ b/gcc/config/m68k/rtemself.h
>>> >> >> @@ -36,3 +36,7 @@
>>> >> >>         builtin_assert ("system=rtems");        \
>>> >> >>      }                                          \
>>> >> >>    while (0)
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/microblaze/rtems.h
>>> >> >> b/gcc/config/microblaze/rtems.h
>>> >> >> index 5f23321..fc8914c 100644
>>> >> >> --- a/gcc/config/microblaze/rtems.h
>>> >> >> +++ b/gcc/config/microblaze/rtems.h
>>> >> >> @@ -35,3 +35,7 @@
>>> >> >>    %{mbig-endian:-EB --oformat=elf32-microblaze} \
>>> >> >>    %{mlittle-endian:-EL --oformat=elf32-microblazeel} \
>>> >> >>    %{mxl-gp-opt:%{G*}} %{!mxl-gp-opt: -G 0}"
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/mips/rtems.h b/gcc/config/mips/rtems.h
>>> >> >> index 66e00bf..6e96853 100644
>>> >> >> --- a/gcc/config/mips/rtems.h
>>> >> >> +++ b/gcc/config/mips/rtems.h
>>> >> >> @@ -37,3 +37,7 @@ do {                                  \
>>> >> >>   */
>>> >> >>  #undef MIPS_DEFAULT_GVALUE
>>> >> >>  #define MIPS_DEFAULT_GVALUE 0
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/moxie/rtems.h b/gcc/config/moxie/rtems.h
>>> >> >> index bc28d6e..6c79063 100644
>>> >> >> --- a/gcc/config/moxie/rtems.h
>>> >> >> +++ b/gcc/config/moxie/rtems.h
>>> >> >> @@ -38,3 +38,7 @@
>>> >> >>  #undef PTRDIFF_TYPE
>>> >> >>  #undef WCHAR_TYPE
>>> >> >>  #undef WCHAR_TYPE_SIZE
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/nios2/rtems.h b/gcc/config/nios2/rtems.h
>>> >> >> index b4a6082..f6eedf6 100644
>>> >> >> --- a/gcc/config/nios2/rtems.h
>>> >> >> +++ b/gcc/config/nios2/rtems.h
>>> >> >> @@ -37,3 +37,7 @@ do {                                    \
>>> >> >>
>>> >> >>     This is done so RTEMS targets have Thread Local Storage like
>>> >> >> Linux.
>>> >> >> */
>>> >> >>  #define TARGET_LINUX_ABI 1
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/riscv/rtems.h b/gcc/config/riscv/rtems.h
>>> >> >> index 231b6a0..a9d1e01 100644
>>> >> >> --- a/gcc/config/riscv/rtems.h
>>> >> >> +++ b/gcc/config/riscv/rtems.h
>>> >> >> @@ -29,3 +29,7 @@
>>> >> >>         builtin_define ("__USE_INIT_FINI__");   \
>>> >> >>         builtin_assert ("system=rtems");        \
>>> >> >>      } while (0)
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/rs6000/rtems.h b/gcc/config/rs6000/rtems.h
>>> >> >> index 54ddcb4..20a4ffa 100644
>>> >> >> --- a/gcc/config/rs6000/rtems.h
>>> >> >> +++ b/gcc/config/rs6000/rtems.h
>>> >> >> @@ -72,6 +72,11 @@
>>> >> >>      }                                                  \
>>> >> >>    while (0)
>>> >> >>
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} ecrti.o%s crtbegin.o%s}"
>>> >> >> +
>>> >> >>  /* Copy and paste from linux64.h and freebsd64.h */
>>> >> >>  #undef RELOCATABLE_NEEDS_FIXUP
>>> >> >>  #define RELOCATABLE_NEEDS_FIXUP \
>>> >> >> diff --git a/gcc/config/rtems.h b/gcc/config/rtems.h
>>> >> >> index dcea95c..9a0619c 100644
>>> >> >> --- a/gcc/config/rtems.h
>>> >> >> +++ b/gcc/config/rtems.h
>>> >> >> @@ -30,11 +30,15 @@
>>> >> >>   * Dummy start/end specification to let linker work as
>>> >> >>   * needed by autoconf scripts using this compiler.
>>> >> >>   */
>>> >> >> +#if 0
>>> >> >>  #undef STARTFILE_SPEC
>>> >> >> -#define STARTFILE_SPEC "crt0.o%s"
>>> >> >> +#define STARTFILE_SPEC "%{!qrtems: crt0.o%s}"
>>> >> >> +#endif
>>> >> >>
>>> >> >> +#if 0
>>> >> >>  #undef ENDFILE_SPEC
>>> >> >>  #define ENDFILE_SPEC   ""
>>> >> >> +#endif
>>> >> >>
>>> >> >>  /*
>>> >> >>   * Some targets do not set up LIB_SPECS, override it, here.
>>> >> >> diff --git a/gcc/config/sh/rtems.h b/gcc/config/sh/rtems.h
>>> >> >> index d2f2b2a..f699151 100644
>>> >> >> --- a/gcc/config/sh/rtems.h
>>> >> >> +++ b/gcc/config/sh/rtems.h
>>> >> >> @@ -29,3 +29,7 @@
>>> >> >>    builtin_define( "__rtems__" );               \
>>> >> >>    builtin_assert( "system=rtems" );            \
>>> >> >>  } while (0)
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/sh/rtemself.h b/gcc/config/sh/rtemself.h
>>> >> >> index 6a67b49..85f26b0 100644
>>> >> >> --- a/gcc/config/sh/rtemself.h
>>> >> >> +++ b/gcc/config/sh/rtemself.h
>>> >> >> @@ -29,3 +29,7 @@
>>> >> >>    builtin_define( "__rtems__" );               \
>>> >> >>    builtin_assert( "system=rtems" );            \
>>> >> >>  } while (0)
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/sparc/rtemself.h
>>> >> >> b/gcc/config/sparc/rtemself.h
>>> >> >> index e4b52d8..7c5bf43 100644
>>> >> >> --- a/gcc/config/sparc/rtemself.h
>>> >> >> +++ b/gcc/config/sparc/rtemself.h
>>> >> >> @@ -38,3 +38,7 @@
>>> >> >>
>>> >> >>  /* Use the default */
>>> >> >>  #undef LINK_GCC_C_SEQUENCE_SPEC
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> diff --git a/gcc/config/v850/rtems.h b/gcc/config/v850/rtems.h
>>> >> >> index b20b2c3..1b56649 100644
>>> >> >> --- a/gcc/config/v850/rtems.h
>>> >> >> +++ b/gcc/config/v850/rtems.h
>>> >> >> @@ -39,3 +39,7 @@
>>> >> >>  %{!mv850es:%{!mv850e1:%{mv*:-mv%*}} \
>>> >> >>  %{m8byte-align:-m8byte-align} \
>>> >> >>  %{mgcc-abi:-mgcc-abi}}"
>>> >> >> +
>>> >> >> +#undef STARTFILE_SPEC
>>> >> >> +#define STARTFILE_SPEC "\
>>> >> >> +%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s crtbegin.o%s}"
>>> >> >> --
>>> >> >> 1.8.3.1
>>> >> >>
>>> >> >> _______________________________________________
>>> >> >> devel mailing list
>>> >> >> devel at rtems.org
>>> >> >> http://lists.rtems.org/mailman/listinfo/devel
>>> >
>>> >
>>
>>
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