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https://github.com/jart/cosmopolitan.git
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9e3e985ae5
Here's some screenshots of an emulator tui program that was compiled on Linux, then scp'd it to Windows, Mac, and FreeBSD. https://justine.storage.googleapis.com/blinkenlights-cmdexe.png https://justine.storage.googleapis.com/blinkenlights-imac.png https://justine.storage.googleapis.com/blinkenlights-freebsd.png https://justine.storage.googleapis.com/blinkenlights-lisp.png How is this even possible that we have a nontrivial ui binary that just works on Mac, Windows, Linux, and BSD? Surely a first ever achievement. Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in emulator for fun and profit.
60 lines
3.3 KiB
ArmAsm
60 lines
3.3 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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/ Tiny Raw Linux Binary Tutorial
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/
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/ i.e. how to not use cosmopolitan runtimes at all
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/ cosmopolitan basically abstracts this
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/ except for all major platforms
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/
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/ make o//examples/raw-linux-hello.elf
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/ o/examples/raw-linux-hello.elf # about 6kb
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/
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/ Next try C but with fancy build tuning
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/
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/ make -j8 -O \
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/ MODE=tiny \
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/ LDFLAGS+=-s \
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/ CPPFLAGS+=-DIM_FEELING_NAUGHTY \
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/ CPPFLAGS+=-DSUPPORT_VECTOR=0b00000001 \
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/ o/tiny/examples/hello2.elf
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/ o/tiny/examples/hello2.elf # about 8kb
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/
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/ @param rsp is [n,argv₀..argvₙ₋₁,0,envp₀..,0,auxv₀..,0,..]
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/ @see also glibc static binaries which start at 800kb!!!
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/ @see also go where interfaces sadly disempower ld prune
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/ @see also the stl where bad linkage is due to tech debt
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/ @see libc/macros-cpp.inc forthe getstr macro definition
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/ @note libc/elf/elf.lds can be tinier with page align off
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/ @note gas is more powerful than nasm due to rms notation
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/ @noreturn
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_start: mov $12,%rdx # arg no. 3 is length
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getstr "hello world\n",%rsi,%esi # arg no. 2 is memory
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mov $1,%edi # arg no. 1 is stdout
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mov $1,%eax # write()
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syscall # libc/sysv/syscalls.sh
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mov $0,%edi # arg no. 1 is success status
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mov $0xE7,%eax # exit_group()
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syscall # context switch
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0: rep nop # basic blockading
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jmp 0b
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.endfn _start,globl
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.source __FILE__
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