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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

4
libc/runtime/ftracer.c
View file

@ -47,7 +47,7 @@ static struct Ftrace {
int64_t lastaddr;
} g_ftrace;
static privileged int GetNestingLevelImpl(struct StackFrame *frame) {
static privileged inline int GetNestingLevelImpl(struct StackFrame *frame) {
int nesting = -2;
while (frame) {
++nesting;
@ -56,7 +56,7 @@ static privileged int GetNestingLevelImpl(struct StackFrame *frame) {
return MAX(0, nesting);
}
static privileged int GetNestingLevel(struct StackFrame *frame) {
static privileged inline int GetNestingLevel(struct StackFrame *frame) {
int nesting;
nesting = GetNestingLevelImpl(frame);
if (nesting < g_ftrace.skew) g_ftrace.skew = nesting;