A C standard library for sh3eb-elf.
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Memallox b27b8de827 Add _console_read() implementation which is called by the read syscall (does not work yet!) 1 year ago
config Sync with upstream gcc. 3 years ago
etc Remove spurious empty line in changelog entry. 3 years ago
include Sync with upstream gcc. 3 years ago
libgloss [Aarch64] Syscalls: fix prototypes 1 year ago
newlib Add _console_read() implementation which is called by the read syscall (does not work yet!) 1 year ago
texinfo * texinfo/texinfo.tex: Update to version 2009-03-28.05. 10 years ago
winsup Move common <sys/dirent.h> content to <dirent.h> 1 year ago
.drone.yml Continuous Integration: Add Tea CI build configuration. 3 years ago
.gitattributes Add .gitattributes 4 years ago
.gitignore Add IDE-specific paths to .gitignore 1 year ago
COPYING 2005-07-14 Kelley Cook <kcook@gcc.gnu.org> 14 years ago
COPYING.LIB Sync toplevel with upstream GCC. 3 years ago
COPYING.LIBGLOSS Add Synopsys license for newlib and libgloss 4 years ago
COPYING.NEWLIB Update Arm entry in COPYING.NEWLIB. 1 year ago
COPYING3 * COPYING3: New file. Contains version 3 of the GNU General Public License. 12 years ago
COPYING3.LIB * COPYING3: New file. Contains version 3 of the GNU General Public License. 12 years ago
ChangeLog Sync with upstream gcc. 3 years ago
MAINTAINERS MAINTAINERS: clarify policy with config/ (and other top level files) 7 years ago
Makefile.def Sync with upstream gcc. 3 years ago
Makefile.in Introduce @unless/@endunless and postbootstrap Makefile targets 1 year ago
Makefile.tpl Introduce @unless/@endunless and postbootstrap Makefile targets 1 year ago
README 19990502 sourceware import 20 years ago
README-maintainer-mode Cleanups after the update to Autoconf 2.64, Automake 1.11. 10 years ago
README.md Add README.md 1 year ago
compile Sync toplevel with upstream GCC. 3 years ago
config-ml.in Sync toplevel with upstream GCC. 3 years ago
config.guess Update config.guess and config.sub 1 year ago
config.rpath Remove freebsd1 from libtool.m4 macros and config.rpath. 8 years ago
config.sub Update config.guess and config.sub 1 year ago
configure Introduce @unless/@endunless and postbootstrap Makefile targets 1 year ago
configure.ac Introduce @unless/@endunless and postbootstrap Makefile targets 1 year ago
depcomp Sync toplevel with upstream GCC. 3 years ago
djunpack.bat * djunpack.bat: Use ".." quoting in Sed command, for the sake of 10 years ago
install-sh Sync toplevel with upstream GCC. 3 years ago
libtool.m4 Sync toplevel with upstream GCC. 3 years ago
ltgcc.m4 * libtool.m4: Update to libtool 2.2.6. 11 years ago
ltmain.sh PR target/59788 5 years ago
ltoptions.m4 Sync Libtool from GCC. 9 years ago
ltsugar.m4 * libtool.m4: Update to libtool 2.2.6. 11 years ago
ltversion.m4 Sync Libtool from GCC. 9 years ago
lt~obsolete.m4 Sync Libtool from GCC. 9 years ago
makefile.vms 19990502 sourceware import 20 years ago
missing Sync toplevel with upstream GCC. 3 years ago
mkdep * mkdep: New file. 20 years ago
mkinstalldirs Sync toplevel with upstream GCC. 3 years ago
move-if-change Sync toplevel with upstream GCC. 3 years ago
setup.com 2009-09-01 Tristan Gingold <gingold@adacore.com> 10 years ago
src-release * src-release (do-proto-toplevel): Support subdir-path-prefixed 6 years ago
symlink-tree 2005-07-14 Kelley Cook <kcook@gcc.gnu.org> 14 years ago
ylwrap Sync toplevel with upstream GCC. 3 years ago

README.md

Newlib - a C Standard Library for Casio Calulators

Motivation

Until now there was no complete C standard library (aka libc) available for the Casio calculators. Although some parts of this library have been provided by fxlib and gint, there was no libc implementation complying with the standard and compatible with the sh3eb architecture ready to use.

To change that, I decided to port newlib to the Casio CPU. Newlib is an alternative libc implementation intended for use on embedded systems.

Alpha

Follow this link and click the download button in the top right corner:

v1.1

Installation

For a complete tutorial on how to setup a toolchain for Casio calculators, see Compiler sous Linux avec GCC.

To build newlib, you first need binutils and gcc for the target sh3eb-elf. Make sure to configure gcc with the arguments --with-newlib --without-headers.

Now you can install newlib. Simply call configure and make:

../newlib-cygwin/configure --target=sh3eb-elf --prefix=...
make
make install

Afterwards, you have to build gcc again with the argument --with-newlib.

For a more detailes tutorial about how to setup newlib in general, see this more detailed turorial.

Features for Casio fx9860g calculators:

  • C standard library libc
    • printf implementation to print text to the display
    • Dynamic allocation of memory using malloc and free
    • Memory manipulation using memcpy, memcmp, memset etc.
    • String manipulation using strcpy, strcmp, strstr, strtok
  • Math library libm
    • Floating point arithmetics
  • Automatic library and include path recognition after installation
  • Basic Casio features:
    • implementation of GetKey, Bdisp_AllClr_DDVRAM, Bdisp_PutDisp_DD, Print and locate without fxlib (but you can use it if you want)

Further information

Upstream Repository

Newlib provides releases in their ftp directory and their code on their git repository. I try to rebase my fork regulary to their master branch to keep it up-to-date.

The target sh3eb-elf

There is a great explanation on the naming convention of targets. To really understand what sh3eb-elf means, I’ll boil it down for you:

To compile code for our Casio calulator, we need to tell newlib where we want to run the code. In our case, the target’s name is sh3eb-elf.

sh is here short for the SuperH processor architecture. (Fortunately, newlib supports SuperH the by default.)

To be more specific, sh3 is a 32-bit CPU architecture of the SuperH family. Furthermore, eb stands for the big endian format (that indicates the byte order used for multi-byte variables). Usually a target also indicates a vendor which in this case is unknown. Lastly, the end of the target’s name is elf (which is usually the kernel). Here, we have no kernel (and hence no operating system) at all.

For newlib, the target sh3eb had to be specifically added.