mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-08-02 07:50:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Add APE support for 32-bit programs

Browse source 
This is an experimental proof of concept demo:

    make -j8 o//examples/i386.i386.com
    o//examples/i386.i386.com --32
    echo $?  # <-- prints main32's argc parameter

Please note there's no libc support at the moment. This change is just
for fun and shouldn't be interpreted as intent to support. Having this
project on the whole support i386 would be tough because the calling
conventions are so different. There really isn't much in the way of low
hanging fruit opportunities to do something like NOP out REX prefixes
and call it a day. It'd likely need disjoint builds or possibly better
yet really cleverly crafted code generation in //third_party/chibicc!

Another challenge is is that Linux changed its SYSCALL ordinals when it
migrated from i386 to x86_64. Linux used to use the same magic numbers
as everyone else for functions like exit/write/read/etc. BSDs on the
other hand didn't pointlessly renumber things. So we'd need to find a
way to define the ordinals in libc/sysv/syscalls.sh twice for Linux. The
same goes for other ISAs too. Especially MIPS. For the Linux Kernel
alone, syscall magic numbers and data structure layouts are totally
different, and that's likely the case for other ISAs on other operating
systems too. Probably because ISA code historically got contributed to
open source by the companies that made the chips. Ulrich Drepper wrote
an amusing essay on the subject some years back.
This commit is contained in:
Justine Tunney 2021-02-20 15:16:27 -08:00
parent e345b42d78
commit face6b61d5
11 changed files with 190 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

32
ape/ape.S
View file

@ -487,6 +487,36 @@ apesh: .ascii "'\n#'\"\n" # sixth edition shebang
.ascii "el"
#endif
.ascii "if exec 7<> \"$o\"; then\n"
// Writes 32-bit ELF header if --32 is the first argument
// This should be changed to check $(uname -m) on ENOEXEC
.ascii "if [ x\"$1\" = x--32 ]; then\n"
.ascii "printf '"
.ascii "\\177ELF" # 0x0: ⌂ELF
.ascii "\\1" # 4: legacy mode
.ascii "\\1" # 5: little endian
.ascii "\\1" # 6: elf v1.o
.ascii "\\011" # 7: FreeBSD
.ascii "\\0" # 8: os/abi ver.
.ascii "\\0\\0\\0" # 9: padding 3/7
.ascii "\\0\\0\\0\\0" # padding 4/7
.ascii "\\2\\0" # 10: εxεcµταblε
.ascii "\\3\\0" # 12: i386
.ascii "\\1\\0\\0\\0" # 14: elf v1.o
.shstub ape_elf32_entry,4 # 18: e_entry
.shstub ape_elf32_phoff,4 # 1c: e_phoff
.shstub ape_elf32_shoff,4 # 20: e_shoff
.ascii "\\0\\0\\0\\0" # 24: e_flags
.ascii "\\100\\0" # 28: e_ehsize
.ascii "\\040\\0" # 2a: e_phentsize
.shstub ape_elf32_phnum,2 # 2c: e_phnum
.ascii "\\0\\0" # 2e: e_shentsize
.shstub ape_elf32_shnum,2 # 30: e_shnum
.shstub ape_elf32_shstrndx,2 # 32: e_shstrndx
.ascii "' >&7\n"
.ascii "else\n"
// Standard 64-bit ELF Header
.ascii "printf '"
.ascii "\\177ELF" # 0x0: ⌂ELF
.ascii "\\2" # 4: long mode
@ -510,6 +540,8 @@ apesh: .ascii "'\n#'\"\n" # sixth edition shebang
.shstub ape_elf_shnum,2 # 3c: e_shnum
.shstub ape_elf_shstrndx,2 # 3e: e_shstrndx
.ascii "' >&7\n"
.ascii "fi\n"
.ascii "exec 7<&-\n"
.ascii "fi\n"
.ascii "exec \"$0\" \"$@\"\n" # etxtbsy tail recursion

12
ape/ape.lds
View file

@ -207,6 +207,9 @@ SECTIONS {
HIDDEN(ape_phdrs = .);
KEEP(*(.elf.phdrs))
HIDDEN(ape_phdrs_end = .);
HIDDEN(ape_phdrs32 = .);
KEEP(*(.elf.phdrs32))
HIDDEN(ape_phdrs32_end = .);
/* OpenBSD */
. = ALIGN(__SIZEOF_POINTER__);
@ -246,7 +249,7 @@ SECTIONS {
/*END: realmode addressability guarantee */
/* Normal Code */
*(.start)
KEEP(*(.start))
KEEP(*(.initprologue))
KEEP(*(SORT_BY_NAME(.init.*)))
KEEP(*(.init))
@ -445,6 +448,13 @@ PFSTUB4(ape_elf_phnum, (ape_phdrs_end - ape_phdrs) / 56);
PFSTUB4(ape_elf_shnum, 0);
PFSTUB4(ape_elf_shstrndx, 0);
PFSTUB4(ape_elf32_entry, _start32);
PFSTUB4(ape_elf32_phoff, RVA(ape_phdrs32));
PFSTUB4(ape_elf32_shoff, 0);
PFSTUB4(ape_elf32_phnum, (ape_phdrs32_end - ape_phdrs32) / 32);
PFSTUB4(ape_elf32_shnum, 0);
PFSTUB4(ape_elf32_shstrndx, 0);
HIDDEN(__privileged_addr = ROUNDDOWN(__privileged_start, PAGESIZE));
HIDDEN(__privileged_size = (ROUNDUP(__privileged_end, PAGESIZE) -
ROUNDDOWN(__privileged_start, PAGESIZE)));