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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
Download patch file Download diff file Expand all files Collapse all files

11
ape/ape.lds
View file

@ -397,6 +397,12 @@ SECTIONS {
KEEP(*(.ape.loader))
. = ALIGN(64);
HIDDEN(ape_loader_end = .);
#if SupportsXnu()
HIDDEN(ape_loader_macho = .);
KEEP(*(.ape.loader-macho))
. = ALIGN(64);
HIDDEN(ape_loader_macho_end = .);
#endif
}
/*END: payload */
/*BEGIN: bss memory void */
@ -549,6 +555,11 @@ HIDDEN(ape_bss_align = PAGESIZE);
SHSTUB2(ape_loader_dd_skip, RVA(ape_loader) / 64);
SHSTUB2(ape_loader_dd_count, (ape_loader_end - ape_loader) / 64);
#if SupportsXnu()
SHSTUB2(ape_loader_macho_dd_skip, RVA(ape_loader_macho) / 64);
SHSTUB2(ape_loader_macho_dd_count, (ape_loader_macho_end - ape_loader_macho) / 64);
#endif
#if SupportsXnu()
SHSTUB2(ape_macho_dd_skip, RVA(ape_macho) / 8);
SHSTUB2(ape_macho_dd_count, (ape_macho_end - ape_macho) / 8);