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https://github.com/jart/cosmopolitan.git
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9f8e6c10dd
Rosetta doesn't correctly respect the startup registers as defined in LC_UNIXTHREAD which makes platform detection go awry. But at least Rosetta appears to consistently set rbx to 0x00000000ffffffff and rdx to 0x0000000000000001 at startup for every x64 executable I could get my hands on. So we use that to detect Rosetta's presence and set up the correct registers for XNU.
138 lines
4.6 KiB
ArmAsm
138 lines
4.6 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macho.internal.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/dce.h"
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#include "libc/macros.internal.h"
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// APE Loader Executable Structure for XNU
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.align 4096
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macho: .long 0xFEEDFACE+1
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.long MAC_CPU_NEXGEN32E
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.long MAC_CPU_NEXGEN32E_ALL
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.long MAC_EXECUTE
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.long 5 # number of load commands
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.long 60f-10f # size of all load commands
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.long MAC_NOUNDEFS # flags
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.long 0 # reserved
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10: .long MAC_LC_SEGMENT_64
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.long 20f-10b # unmaps first page dir
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.ascin "__PAGEZERO",16 # consistent with linux
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.quad 0,0x200000,0,0 # which forbids mem <2m
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.long 0,0,0,0
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20: .long MAC_LC_SEGMENT_64
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.long 30f-20b
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.ascin "__TEXT",16
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.quad macho # vaddr
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.quad 4096 # memsz
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.quad 0 # file offset
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.quad filesz # file size
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.long PROT_EXEC|PROT_READ|PROT_WRITE # maxprot
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.long PROT_EXEC|PROT_READ # initprot
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.long 1 # segment section count
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.long 0 # flags
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210: .ascin "__text",16 # section name (.text)
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.ascin "__TEXT",16
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.quad _start # vaddr
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.quad textsz # memsz
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.long textoff # offset
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.long 6 # align 2**3 = 64
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.long 0 # reloc table offset
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.long 0 # relocation count
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.long MAC_S_ATTR_SOME_INSTRUCTIONS # section type & attributes
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.long 0,0,0 # reserved
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30: .long MAC_LC_SEGMENT_64
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.long 40f-30b
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.ascin "__DATA",16
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.quad bss # vaddr
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.quad bsssize # memsz
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.quad 0 # offset
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.quad 0 # file size
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.long PROT_EXEC|PROT_READ|PROT_WRITE # maxprot
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.long PROT_READ|PROT_WRITE # initprot
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.long 1 # segment section count
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.long 0 # flags
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310: .ascin "__bss",16 # section name (.bss)
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.ascin "__DATA",16
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.quad bss # vaddr
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.quad bsssize # memsz
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.long 0 # offset
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.long 12 # align 2**12 = 4096
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.long 0 # reloc table offset
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.long 0 # relocation count
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.long MAC_S_ZEROFILL # section type & attributes
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.long 0,0,0 # reserved
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40: .long MAC_LC_UUID
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.long 50f-40b
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.quad 0x3fb29ee4ac6c87aa # uuid1
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.quad 0xdd2c9bb866d9eef8 # uuid2
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50: .long MAC_LC_UNIXTHREAD
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.long 60f-50b # cmdsize
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.long MAC_THREAD_NEXGEN32E # flavaflav
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.long (520f-510f)/4 # count
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510: .quad 0 # rax
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.quad 0 # rbx
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.quad 0 # rcx
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.quad XNU # rdx
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.quad 0 # rdi
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.quad 0 # rsi
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.quad 0 # rbp
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.quad 0 # rsp
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.quad 0 # r8
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.quad 0 # r9
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.quad 0 # r10
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.quad 0 # r11
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.quad 0 # r12
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.quad 0 # r13
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.quad 0 # r14
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.quad 0 # r15
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.quad _start # rip
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.quad 0 # rflags
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.quad 0 # cs
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.quad 0 # fs
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.quad 0 # gs
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520:
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60:
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.endobj macho,globl
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.align 64
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_start:
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// Hack for detecting M1 Rosetta environment.
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// https://github.com/jart/cosmopolitan/issues/429#issuecomment-1166704377
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cmp $-1,%ebx
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jne 0f
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cmp $+1,%edx
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jne 0f
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mov $XNU,%dl
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xor %ecx,%ecx
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0: mov %rsp,%rsi
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jmp ApeLoader
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.endfn _start,globl
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__syscall_loader:
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clc
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syscall
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jc 1f
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ret
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1: neg %rax
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ret
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.endfn __syscall_loader,globl
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