2022-05-21 14:52:58 +00:00
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/*-*- 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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2023-07-01 12:10:12 +00:00
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.section .head
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.balign 64
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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 4 // number of load commands
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.long 50f-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 filesz // 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 0 // segment section count
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.long 0 // flags
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30: .long MAC_LC_UUID
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.long 40f-30b
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.quad 0x3fb29ee4ac6c87aa // uuid1
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.quad 0xdd2c9bb866d9eef8 // uuid2
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40: .long MAC_LC_UNIXTHREAD
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.long 50f-40b // cmdsize
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.long MAC_THREAD_NEXGEN32E // flavaflav
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.long (420f-410f)/4 // count
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410: .quad 0 // rax
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.quad 0 // rbx
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.quad 0 // rcx
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.quad 0 // 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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420:
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50:
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.endobj macho,globl
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2023-05-02 02:43:59 +00:00
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.balign 64
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_start: mov $_HOSTXNU,%dl // xnu's not unix!
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mov %rsp,%rsi // save real stack
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sub $1024*1024,%rsp // room for allocs
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jmp ApeLoader
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.endfn _start,globl
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// Invokes system call.
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//
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// This function has eight parameters. The first seven are for
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// arguments passed along to the system call. The eight is for
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// the magic number that indicates which system call is called
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//
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// The return value follows the Linux kernel convention, where
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// errors are returned as `-errno`. BSD systems are normalized
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// to follow this convention automatically.
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SystemCall:
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mov %rcx,%r10
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mov 16(%rsp),%eax
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clc
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syscall
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jnc 1f
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neg %rax
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1: ret
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.endfn SystemCall,globl
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