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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

57
ape/ape.mk
View file

@ -15,18 +15,18 @@
PKGS += APE
APE = o/$(MODE)/ape/ape.o \
APE = o/$(MODE)/ape/ape.o \
o/$(MODE)/ape/ape.lds
APE_NO_MODIFY_SELF = \
o/$(MODE)/ape/ape.lds \
APE_NO_MODIFY_SELF = \
o/$(MODE)/ape/ape.lds \
o/$(MODE)/ape/ape-no-modify-self.o
APELINK = \
$(COMPILE) \
-ALINK.ape \
$(LINK) \
$(LINKARGS) \
APELINK = \
$(COMPILE) \
-ALINK.ape \
$(LINK) \
$(LINKARGS) \
$(OUTPUT_OPTION)
APE_FILES := $(wildcard ape/*.*)
@ -38,32 +38,43 @@ APE_SRCS = $(APE_SRCS_C) $(APE_SRCS_S)
APE_OBJS = $(APE_SRCS_S:%.S=o/$(MODE)/%.o)
APE_CHECKS = $(APE_HDRS:%=o/%.ok)
o/$(MODE)/ape/ape.lds: \
ape/ape.lds \
ape/macros.internal.h \
libc/dce.h \
o/$(MODE)/ape/ape.lds: \
ape/ape.lds \
ape/macros.internal.h \
libc/dce.h \
libc/zip.h
o/ape/idata.inc: \
ape/idata.internal.h \
o/ape/idata.inc: \
ape/idata.internal.h \
ape/relocations.h
o/$(MODE)/ape/ape-no-modify-self.o: ape/ape.S o/$(MODE)/ape/loader.elf
@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -DAPE_LOADER="\"o/$(MODE)/ape/loader.elf\"" -DAPE_NO_MODIFY_SELF $<
o/$(MODE)/ape/ape-no-modify-self.o: \
ape/ape.S \
o/$(MODE)/ape/ape \
o/$(MODE)/ape/ape.macho
@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -DAPE_LOADER="\"o/$(MODE)/ape/ape\"" -DAPE_LOADER_MACHO="\"o/$(MODE)/ape/ape.macho\"" $<
o/$(MODE)/ape/loader.o: ape/loader.c
@$(COMPILE) -AOBJECTIFY.c $(CC) $(cpp.flags) -fpie -Os -ffreestanding -mno-red-zone -fno-ident -fno-gnu-unique -c $(OUTPUT_OPTION) $<
@$(COMPILE) -AOBJECTIFY.c $(CC) -DNDEBUG -iquote. -Wall -Wextra -fpie -Os -g -ffreestanding -mno-red-zone -fno-ident -fno-gnu-unique -c $(OUTPUT_OPTION) $<
o/$(MODE)/ape/loader-gcc.asm: ape/loader.c
@$(COMPILE) -AOBJECTIFY.c $(CC) $(cpp.flags) -Os -ffreestanding -mno-red-zone -fno-ident -fno-gnu-unique -c -S $(OUTPUT_OPTION) $<
@$(COMPILE) -AOBJECTIFY.c $(CC) -DNDEBUG -iquote. -Wall -Wextra -fpie -Os -g -ffreestanding -mno-red-zone -fno-ident -fno-gnu-unique -c -S $(OUTPUT_OPTION) $<
o/$(MODE)/ape/loader.elf: \
o/$(MODE)/ape/loader.o \
o/$(MODE)/ape/loader1.o \
o/$(MODE)/ape/ape: \
o/$(MODE)/ape/loader.o \
o/$(MODE)/ape/loader-elf.o \
ape/loader.lds
@$(ELFLINK) -s -z max-page-size=0x10
o/$(MODE)/ape/ape.macho: \
o/$(MODE)/ape/loader.o \
o/$(MODE)/ape/loader-macho.o \
ape/loader-macho.lds
@$(ELFLINK) -s -z max-page-size=0x10
.PHONY: o/$(MODE)/ape
o/$(MODE)/ape: $(APE) \
$(APE_CHECKS) \
o/$(MODE)/ape: $(APE) \
$(APE_CHECKS) \
o/$(MODE)/ape/ape \
o/$(MODE)/ape/ape.macho \
o/$(MODE)/ape/ape-no-modify-self.o