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Support Linux binfmt_misc and APE loading on Apple

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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.
This commit is contained in:
Justine Tunney 2022-05-21 07:52:58 -07:00
parent 7838edae88
commit db0d8dd806
31 changed files with 1089 additions and 305 deletions
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36
examples/nomodifyself.c Normal file
View file

@ -0,0 +1,36 @@
#if 0
/*─────────────────────────────────────────────────────────────────╗
│ To the extent possible under law, Justine Tunney has waived │
│ all copyright and related or neighboring rights to this file, │
│ as it is written in the following disclaimers: │
│ • http://unlicense.org/ │
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/dce.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
/**
* @fileoverview Non-Self-Modifying APE Binary Demo
*
* See examples/examples.mk for the build config, which uses the
* alternative APE runtime.
*/
int main(int argc, char *argv[]) {
if (_base[0] == 'M' && _base[1] == 'Z') {
printf("success: %s spawned without needing to modify its "
"executable header, thanks to APE loader\n",
argv[0]);
if (!IsWindows()) {
printf(", thanks to APE loader!\n");
} else {
printf(", because you ran it on Windows :P\n");
}
return 0;
} else {
printf("error: %s doesn't have an MZ file header!\n", argv[0]);
return 1;
}
}