[PATCH 00/16] 64-bit RISC-V support

[W. J. van der Laan]

This patch set is the bare minimum to make mescc self-hosting on 64 bit RISC-V.
The exact architecture targeted is RV64IM: 64-bit RISC-V with Multiply
extension. A lowest common denominator. It also adds some basic constants to
prepare for RISC-V 32 bit.

Due to some compromises that were made around immediate values, alignment, and
conditionals, current generated code is much slower than necessary. This can be
improved in future work.

I have developed and tested this on Fedora on a SiFive Unleashed board. All the
tests pass except for "pointer-arithmetic" and "extern", both for gcc and mescc
so at least they are on-par.

Required patches for M1 and hex2_linker can be found at
https://github.com/laanwj/guix-mescc-tools/commits/riscv . I will upstream
these to mescc-tools separately.

W. J. van der Laan (16):
  lib/tests: Pass int to va_arg instead of char.
  mescc: Add r0-cmp-r1 instruction.
  configure: Recognize RISC-V architectures.
  mes: Add RISC-V architecture detection.
  lib: Make Linux scaffold work for RV64.
  lib: Add RV64 Linux syscall numbers header.
  lib: Base riscv64-mes-gcc support (dummy setjmp).
  lib: Linux riscv64-mes-gcc support.
  lib: Add _sys_call_5 for Linux RV64.
  lib: General Linux RV64 syscall support.
  lib/tests: Take RISC-V into account in size conditionals.
  lib: Make stdarg work for GCC on RV64.
  mescc: RV64 code generation.
  lib: Add RV64 instruction macros for M1
  lib: Base riscv64-mes-mescc support.
  lib: Linux riscv64-mes-mescc support.

 build-aux/build-guile.sh                      |   2 +
 configure                                     |   8 +-
 include/fcntl.h                               |   4 +
 include/linux/riscv64/syscall.h               |  91 +++
 include/linux/syscall.h                       |   1 +
 include/stdarg.h                              |  14 +-
 include/stdint.h                              |   4 +-
 include/sys/stat.h                            |   4 +-
 lib/linux/_open3.c                            |   6 +
 lib/linux/access.c                            |   9 +-
 lib/linux/chmod.c                             |   7 +
 lib/linux/dup2.c                              |   6 +
 lib/linux/fork.c                              |   8 +
 lib/linux/getdents.c                          |   6 +
 lib/linux/link.c                              |   7 +
 lib/linux/lstat.c                             |   8 +
 lib/linux/mkdir.c                             |   7 +
 lib/linux/mknod.c                             |   7 +
 lib/linux/pipe.c                              |   7 +
 lib/linux/readlink.c                          |   7 +
 lib/linux/rename.c                            |   7 +
 lib/linux/riscv64-mes-gcc/_exit.c             |  38 +
 lib/linux/riscv64-mes-gcc/_write.c            |  40 +
 lib/linux/riscv64-mes-gcc/crt1.c              |  90 +++
 lib/linux/riscv64-mes-gcc/exit-42.S           |  31 +
 lib/linux/riscv64-mes-gcc/hello-mes.S         |  45 ++
 lib/linux/riscv64-mes-gcc/syscall-internal.c  |  62 ++
 lib/linux/riscv64-mes-gcc/syscall.c           | 197 +++++
 lib/linux/riscv64-mes-mescc/_exit.c           |  31 +
 lib/linux/riscv64-mes-mescc/_write.c          |  33 +
 lib/linux/riscv64-mes-mescc/crt1.c            |  70 ++
 .../riscv64-mes-mescc/syscall-internal.c      |  56 ++
 lib/linux/riscv64-mes-mescc/syscall.c         | 182 +++++
 lib/linux/riscv64-mes/elf64-0exit-42.hex2     |  34 +
 lib/linux/riscv64-mes/elf64-0header.hex2      |  84 ++
 lib/linux/riscv64-mes/elf64-0hello-mes.hex2   |  59 ++
 lib/linux/riscv64-mes/elf64-body-exit-42.hex2 |  53 ++
 .../riscv64-mes/elf64-body-hello-mes.hex2     |  70 ++
 .../riscv64-mes/elf64-footer-single-main.hex2 |  62 ++
 lib/linux/riscv64-mes/elf64-header.hex2       | 241 ++++++
 lib/linux/rmdir.c                             |   7 +
 lib/linux/signal.c                            |   9 -
 lib/linux/stat.c                              |   7 +
 lib/linux/symlink.c                           |   7 +
 lib/linux/unlink.c                            |   7 +
 lib/linux/waitpid.c                           |   2 +-
 lib/riscv64-mes-gcc/setjmp.c                  |  39 +
 lib/riscv64-mes-mescc/setjmp.c                |  47 ++
 lib/riscv64-mes/riscv64.M1                    | 349 +++++++++
 lib/tests/scaffold/70-stdarg.c                |   6 +-
 lib/tests/scaffold/76-pointer-arithmetic.c    |   4 +-
 lib/tests/scaffold/7k-for-each-elem.c         |   6 +-
 lib/tests/scaffold/85-sizeof.c                |   4 +-
 mes/module/mescc/mescc.mes                    |   1 +
 mes/module/mescc/riscv64/as.mes               |  24 +
 mes/module/mescc/riscv64/info.mes             |  23 +
 module/mescc/armv4/as.scm                     |   1 +
 module/mescc/compile.scm                      |  10 +-
 module/mescc/i386/as.scm                      |   1 +
 module/mescc/mescc.scm                        |  37 +-
 module/mescc/riscv64/as.scm                   | 738 ++++++++++++++++++
 module/mescc/riscv64/info.scm                 |  63 ++
 module/mescc/x86_64/as.scm                    |   1 +
 src/mes.c                                     |   8 +
 64 files changed, 3055 insertions(+), 44 deletions(-)
 create mode 100644 include/linux/riscv64/syscall.h
 create mode 100644 lib/linux/riscv64-mes-gcc/_exit.c
 create mode 100644 lib/linux/riscv64-mes-gcc/_write.c
 create mode 100644 lib/linux/riscv64-mes-gcc/crt1.c
 create mode 100644 lib/linux/riscv64-mes-gcc/exit-42.S
 create mode 100644 lib/linux/riscv64-mes-gcc/hello-mes.S
 create mode 100644 lib/linux/riscv64-mes-gcc/syscall-internal.c
 create mode 100644 lib/linux/riscv64-mes-gcc/syscall.c
 create mode 100644 lib/linux/riscv64-mes-mescc/_exit.c
 create mode 100644 lib/linux/riscv64-mes-mescc/_write.c
 create mode 100644 lib/linux/riscv64-mes-mescc/crt1.c
 create mode 100644 lib/linux/riscv64-mes-mescc/syscall-internal.c
 create mode 100644 lib/linux/riscv64-mes-mescc/syscall.c
 create mode 100644 lib/linux/riscv64-mes/elf64-0exit-42.hex2
 create mode 100644 lib/linux/riscv64-mes/elf64-0header.hex2
 create mode 100644 lib/linux/riscv64-mes/elf64-0hello-mes.hex2
 create mode 100644 lib/linux/riscv64-mes/elf64-body-exit-42.hex2
 create mode 100644 lib/linux/riscv64-mes/elf64-body-hello-mes.hex2
 create mode 100644 lib/linux/riscv64-mes/elf64-footer-single-main.hex2
 create mode 100644 lib/linux/riscv64-mes/elf64-header.hex2
 create mode 100644 lib/riscv64-mes-gcc/setjmp.c
 create mode 100644 lib/riscv64-mes-mescc/setjmp.c
 create mode 100644 lib/riscv64-mes/riscv64.M1
 create mode 100644 mes/module/mescc/riscv64/as.mes
 create mode 100644 mes/module/mescc/riscv64/info.mes
 create mode 100644 module/mescc/riscv64/as.scm
 create mode 100644 module/mescc/riscv64/info.scm

--
2.27.0