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db0d8dd806
The "no modify self" variant of Actually Portable Executable is now
supported on all platforms. If you use `$(APE_NO_MODIFY_SELF)` then
ld.bfd will embed a 4096 byte ELF binary and a 4096 byte Macho file
which are installed on the fly to ${TMPDIR:-/tmp}, which enables us
launch the executable, without needing to copy the whole executable
To prevent it from copying a tiny executable to your temp directory
you need to install the `ape` command (renamed from ape-loader), to
a system path. For example:
# FreeBSD / NetBSD / OpenBSD
make -j8 o//ape/ape
cp o//ape/ape /usr/bin/ape
# Mac OS
# make -j8 o//ape/ape.macho
curl https://justine.lol/ape.macho >/usr/bin/ape
chmod +x /usr/bin/ape
On Linux you can get even more performance with the new binfmt_misc
support which makes launching non-modifying APE binaries as fast as
launching ELF executables. Running the following command:
# Linux
ape/apeinstall.sh
Will copy APE loader to /usr/bin/ape and register with binfmt_misc
Lastly, this change also fixes a really interesting race condition
with OpenBSD thread joining.
62 lines
3.8 KiB
C
62 lines
3.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚──────────────────────────────────────────────────────────────────────────────╝
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▄ ▄▄▄
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▄▄▓▓██▀░ ▄ ▄▓▌▀▀▀███▒
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▄ ░██░ ░▀▀ ▓▓█▓█▌ ▄▄▄██▀░ ▄▄░
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░▄▓██░ ░██▄ ▄▄▓▌ ▄▓███░ ░▄█▀▄▓▒
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░░▓█▓▄ ░▀██▒ ░▀█▄ ░▓██▓▄▒▄▄▀▀ ▄█▓▀▐██░
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▄███ ▀██▄ ▀▓█▓▄▄▓▀ ▀▀▀▀ ░▄▄█▀░▒▓██▓ ░░▄▄▄▄▄▄
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▄▄▓▀▐██ ░ ▓██▓▒ ▀▀ ▀▀▀ ▄▄██░ ▄▓██▓▀░░▀█░
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▀▒▓░ ▐██▓ ▓▓▒ ▀▀░ ▀▀▀█▒ ▓█▓▀░ ▄█▓▓░
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▒▀ ▒██▒░▄█▓▀ VARIABLE LENGTH INTEGER ENCODING ▓█░ ▐▓▄ ░ ▓
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░███▓▀ ▀▓▓██▀▀░
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░▀░ */
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#include "libc/fmt/leb128.h"
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/**
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* Encodes signed integer to array w/ zig-zag encoding.
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*
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* uleb64 INT64_MAX l: 10𝑐 3𝑛𝑠
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* zleb64 INT64_MAX l: 13𝑐 4𝑛𝑠
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* sleb64 INT64_MAX l: 16𝑐 5𝑛𝑠
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* uleb128 INT64_MAX l: 18𝑐 6𝑛𝑠
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* zleb128 INT64_MAX l: 18𝑐 6𝑛𝑠
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* sleb128 INT64_MAX l: 24𝑐 8𝑛𝑠
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*
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* @param p is output array which should have 10 items
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* @param x is number
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* @return p + i
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* @see unzleb64()
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*/
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char *zleb64(char p[hasatleast 10], int64_t x) {
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int c;
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uint64_t u;
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u = x;
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u <<= 1;
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u ^= x >> 63;
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for (;;) {
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c = u & 127;
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if (!(u >>= 7)) {
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*p++ = c;
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return p;
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} else {
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*p++ = c | 128;
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}
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}
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}
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