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Justine Tunney edd9297eba Support malloc() on bare metal
Your Actually Portable Executables now contains a simple virtual memory
that works similarly to the Linux Kernel in the sense that it maps your
physical memory to negative addresses. This is needed to support mmap()
and malloc(). This functionality has zero code size impact. For example
the MODE=tiny LIFE.COM executable is still only 12KB in size.

The APE bootloader code has also been simplified to improve readibility
and further elevate the elegance by which we're able to support so many
platforms thereby enhancing verifiability so that we may engender trust
in this bootloading process.
2021-02-24 00:53:24 -08:00
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Cosmopolitan Honeybadger

Cosmopolitan

Cosmopolitan Libc makes C a build-once run-anywhere language, like Java, except it doesn't need an interpreter or virtual machine. Instead, it reconfigures stock GCC and Clang to output a POSIX-approved polyglot format that runs natively on Linux + Mac + Windows + FreeBSD + OpenBSD + NetBSD + BIOS with the best possible performance and the tiniest footprint imaginable.

Background

For an introduction to this project, please read the αcτµαlly pδrταblε εxεcµταblε blog post and cosmopolitan libc website. We also have API documentation.

Getting Started

If you're doing your development work on Linux or BSD then you need just five files to get started:

wget https://justine.lol/cosmopolitan/cosmopolitan-amalgamation-0.2.zip
unzip cosmopolitan-amalgamation-0.2.zip
printf 'main() { printf("hello world\\n"); }\n' >hello.c
gcc -g -O -static -nostdlib -nostdinc -fno-pie -no-pie -mno-red-zone \
  -o hello.com.dbg hello.c -fuse-ld=bfd -Wl,-T,ape.lds \
  -include cosmopolitan.h crt.o ape.o cosmopolitan.a
objcopy -S -O binary hello.com.dbg hello.com
./hello.com

If you're developing on Windows or MacOS then you need to download an x86_64-pc-linux-gnu toolchain beforehand. See the Compiling on Windows tutorial. It's needed because the ELF object format is what makes universal binaries possible.

Cosmopolitan can also be compiled from source on any Linux distro.

wget https://justine.lol/cosmopolitan/cosmopolitan-0.2.tar.gz
tar xf cosmopolitan-0.2.tar.gz  # see releases page
cd cosmopolitan-0.2
make -j16
o//examples/hello.com
find o -name \*.com | xargs ls -rShal | less