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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

21
libc/crt/crt.S
View file

@ -26,6 +26,8 @@
//
// @param rsp is [n,argv₀..argvₙ₋₁,0,envp₀..,0,auxv₀..,0,..]
// @note FreeBSD is special (see freebsd/lib/csu/amd64/...)
// @note NetBSD will only zero the call-clobbered registers
// @note ape.S and ape-loader both set RCX to XNU on Darwin
// @noreturn
_start:
@ -34,12 +36,16 @@ _start:
test %rdi,%rdi
cmovnz %rdi,%rsp
jz 0f
movb $FREEBSD,__hostos(%rip)
movb $FREEBSD,%cl
0:
#endif
// set operating system when already detected
mov %cl,__hostos(%rip)
// get startup timestamp as early as possible
// its used by --strace flag and kprintf() %T
0: rdtsc
rdtsc
ezlea kStartTsc,bx
mov %eax,(%rbx)
mov %edx,4(%rbx)
@ -85,14 +91,3 @@ _start:
call cosmo
9: .unreachable
.endfn _start,weak,hidden
#if SupportsXnu()
// Macintosh userspace program entrypoint.
//
// @param rsp is [n,argv₀..argvₙ₋₁,0,envp₀..,0,auxv₀..,0,..]
// @note FreeBSD is special (see freebsd/lib/csu/amd64/...)
// @noreturn
_xnu: movb $XNU,__hostos(%rip)
jmp 0b
.endfn _xnu,weak,hidden
#endif