mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 15:38:22 +00:00
40eb3b9d5d
This change (1) upgrades to OpenBSD's newer kernel ABIs, and (2)
modifies APE to have a read-only data segment. Doing this required
creating APE Loader v1.1, which is backwards and forwards compatible
with the previous version.
If you've run the following commands in the past to install your APE
Loader systemwide, then you need to run them again. Ad-hoc installations
shouldn't be impacted. It's also recommended that APE binaries be remade
after upgrading, since they embed old versions of the APE Loader.
ape/apeuninstall.sh
ape/apeinstall.sh
This change does more than just fix OpenBSD. The new loader is smarter
and more reliable. We're now able create much tinier ELF and Mach-O data
structures than we could before. Both APE Loader and execvpe() will now
normalize ambiguous argv[0] resolution the same way as the UNIX shell.
Badness with TLS linkage has been solved.
Fixes #826
199 lines
5.9 KiB
ArmAsm
199 lines
5.9 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/elf/def.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/macho.internal.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
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// Linux, FreeBSD, NetBSD, OpenBSD
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.section .head
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.balign 8
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ehdr: .ascii "\177ELF"
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.byte ELFCLASS64
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.byte ELFDATA2LSB
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.byte 1
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.byte ELFOSABI_FREEBSD
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.quad 0
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.word ET_EXEC // e_type
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.word EM_NEXGEN32E // e_machine
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.long 1 // e_version
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.quad _start // e_entry
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.quad phdrs - ehdr // e_phoff
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.quad 0 // e_shoff
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.long 0 // e_flags
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.word 64 // e_ehsize
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.word 56 // e_phentsize
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.word 4 // e_phnum
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.word 0 // e_shentsize
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.word 0 // e_shnum
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.word 0 // e_shstrndx
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.endobj ehdr,globl
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.balign 8
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phdrs: .long PT_LOAD // p_type
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.long PF_R // p_flags
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.quad 0 // p_offset
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.quad ehdr // p_vaddr
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.quad ehdr // p_paddr
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.quad rosize // p_filesz
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.quad rosize // p_memsz
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.quad 4096 // p_align
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.long PT_LOAD // p_type
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.long PF_X // p_flags
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.quad rosize // p_offset
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.quad text // p_vaddr
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.quad text // p_paddr
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.quad textsz // p_filesz
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.quad textsz // p_memsz
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.quad 4096 // p_align
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.long PT_GNU_STACK // p_type
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.long PF_R|PF_W // p_flags
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.quad 0 // p_offset
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.quad 0 // p_vaddr
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.quad 0 // p_paddr
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.quad 0 // p_filesz
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.quad 8*1024*1024 // p_memsz
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.quad 16 // p_align
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.long PT_NOTE // p_type
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.long PF_R // p_flags
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.quad note - ehdr // p_offset
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.quad note // p_vaddr
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.quad note // p_paddr
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.quad notesize // p_filesz
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.quad notesize // p_memsz
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.quad 8 // p_align
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.endobj phdrs
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note: .long 2f-1f
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.long 4f-3f
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.long 1
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1: .asciz "OpenBSD"
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2: .balign 4
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3: .long 0
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4: .long 2f-1f
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.long 4f-3f
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.long 1
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1: .asciz "NetBSD"
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2: .balign 4
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3: .long 901000000
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4: .endobj note
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notesize = . - note
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.balign 64,0 // for ape.S dd
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.org 64*6 // for ape.S dd
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// APE Loader XNU Header
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//
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// This header is dd'd backwards by the APE shell script when
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// running on Mac OS X.
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//
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// @see ape/ape.S
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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 ehdr // 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 0xdd2c9bb866d9eef9 // 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 _apple // 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
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.balign 64,0 // for ape.S dd
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.org 64*12 // for ape.S dd
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.text
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_apple: mov $_HOSTXNU,%dl // xnu's not unix!
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_start: 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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.endfn _apple,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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