mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-27 06:48:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Mint APE Loader v1.3

Browse source 
This version has better error messages and safety checks. It supports
loading static position-independent executables. It correctly handles
more kinds of weird ELF program header layouts. A force flag has been
added to avoid system execve(). Finally the longstanding misalignment
with our ELF PT_NOTE section has been addressed.
This commit is contained in:
Justine Tunney 2023-07-23 17:07:38 -07:00
parent 82b1e61443
commit 3d172c99fe
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
19 changed files with 1001 additions and 470 deletions
Download patch file Download diff file Expand all files Collapse all files

83
ape/loader-macho.S
View file

@ -21,18 +21,19 @@
#include "libc/dce.h"
#include "libc/macros.internal.h"
// APE Loader Executable Structure for XNU
.section .head
// Apple Mach-O Executable Headers
// Fixups are applied by objbincopy.com
// There must exist a MAC_LC_SEGMENT_64 for every PT_LOAD
.section .macho,"a",@progbits
.balign 64
macho: .long 0xFEEDFACE+1
.long 0xFEEDFACE+1
.long MAC_CPU_NEXGEN32E
.long MAC_CPU_NEXGEN32E_ALL
.long MAC_EXECUTE
.long 4 // number of load commands
.long 50f-10f // size of all load commands
.long MAC_NOUNDEFS // flags
.long 5 // number of load commands
.long 60f-10f // size of all load commands
.long MAC_NOUNDEFS|MAC_SPLIT_SEGS // flags
.long 0 // reserved
10: .long MAC_LC_SEGMENT_64
.long 20f-10b // unmaps first page dir
@ -42,23 +43,34 @@ macho: .long 0xFEEDFACE+1
20: .long MAC_LC_SEGMENT_64
.long 30f-20b
.ascin "__TEXT",16
.quad macho // vaddr
.quad filesz // memsz
.quad 0 // vaddr
.quad 0 // memsz
.quad 0 // file offset
.quad filesz // file size
.long PROT_EXEC|PROT_READ|PROT_WRITE // maxprot
.long PROT_EXEC|PROT_READ // initprot
.quad 0 // file size
.long 0 // maxprot
.long 0 // initprot
.long 0 // segment section count
.long 0 // flags
30: .long MAC_LC_UUID
30: .long MAC_LC_SEGMENT_64
.long 40f-30b
.quad 0x3fb29ee4ac6c87aa // uuid1
.quad 0xdd2c9bb866d9eef8 // uuid2
40: .long MAC_LC_UNIXTHREAD
.long 50f-40b // cmdsize
.ascin "__RODATA",16
.quad 0 // vaddr
.quad 0 // memsz
.quad 0 // file offset
.quad 0 // file size
.long 0 // maxprot
.long 0 // initprot
.long 0 // segment section count
.long 0 // flags
40: .long MAC_LC_UUID
.long 50f-40b
.quad 0x4527148ba7a513ef // uuid1
.quad 0x56fa865940665e8f // uuid2
50: .long MAC_LC_UNIXTHREAD
.long 60f-50b // cmdsize
.long MAC_THREAD_NEXGEN32E // flavaflav
.long (420f-410f)/4 // count
410: .quad 0 // rax
.long (520f-510f)/4 // count
510: .quad 0 // rax
.quad 0 // rbx
.quad 0 // rcx
.quad 0 // rdx
@ -74,37 +86,10 @@ macho: .long 0xFEEDFACE+1
.quad 0 // r13
.quad 0 // r14
.quad 0 // r15
.quad _start // rip
.quad XnuEntrypoint // rip
.quad 0 // rflags
.quad 0 // cs
.quad 0 // fs
.quad 0 // gs
420:
50:
.endobj macho,globl
.balign 64
_start: mov $_HOSTXNU,%dl // xnu's not unix!
mov %rsp,%rsi // save real stack
sub $1024*1024,%rsp // room for allocs
jmp ApeLoader
.endfn _start,globl
// Invokes system call.
//
// This function has eight parameters. The first seven are for
// arguments passed along to the system call. The eight is for
// the magic number that indicates which system call is called
//
// The return value follows the Linux kernel convention, where
// errors are returned as `-errno`. BSD systems are normalized
// to follow this convention automatically.
SystemCall:
mov %rcx,%r10
mov 16(%rsp),%eax
clc
syscall
jnc 1f
neg %rax
1: ret
.endfn SystemCall,globl
520:
60: