mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-05-23 22:02:27 +00:00
Temporarily turn down redbean StoreAsset() feature
This commit is contained in:
Justine Tunney
parent
18536950b3
commit
5c9e03e3e0
2 changed files with 31 additions and 208 deletions
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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/dce.h"
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#include "libc/macros.internal.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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.privileged
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// Opens executable in O_RDWR mode.
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//
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// To avoid ETXTBSY we need to unmap the running executable first,
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// then open the file, and finally load the code back into memory.
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//
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// @return file descriptor
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// @note only works on .com binary (not .com.dbg)
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// @note only supports linux, freebsd, openbsd, and netbsd
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_OpenExecutable:
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push %rbp
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mov %rsp,%rbp
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pushq __NR_open(%rip) // -0x08(%rbp)
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pushq __NR_mmap(%rip) // -0x10(%rbp)
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pushq __NR_munmap(%rip) // -0x18(%rbp)
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pushq $O_RDWR // -0x20(%rbp)
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pushq MAP_ANONYMOUS(%rip) // -0x28(%rbp)
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pushq MAP_PRIVATE(%rip) // -0x30(%rbp)
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pushq MAP_FIXED(%rip) // -0x38(%rbp)
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pushq __NR_mprotect(%rip) // -0x40(%rbp)
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pushq $O_RDONLY // -0x48(%rbp)
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push %rbx // code buffer
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push %r12 // data buffer
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push %r14 // filename
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push %r15 // fd
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// Get filename.
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lea program_executable_name(%rip),%r14
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// Allocate code buffer.
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mov -0x10(%rbp),%eax // __NR_mmap
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xor %edi,%edi
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mov $PAGESIZE,%esi
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mov $PROT_READ|PROT_WRITE,%edx
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mov -0x28(%rbp),%r10d // MAP_ANONYMOUS
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or -0x30(%rbp),%r10d // MAP_PRIVATE
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mov $-1,%r8
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mov $0,%r9
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push %r9 // openbsd:pad
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push %r9 // openbsd:align
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syscall
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pop %r9
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pop %r9
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mov %rax,%rbx
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// Allocate data buffer.
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mov -0x10(%rbp),%eax // __NR_mmap
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xor %edi,%edi
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mov $ape_ram_filesz,%esi
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mov $PROT_READ|PROT_WRITE,%edx
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mov -0x28(%rbp),%r10d // MAP_ANONYMOUS
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or -0x30(%rbp),%r10d // MAP_PRIVATE
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mov $-1,%r8
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mov $0,%r9
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push %r9 // openbsd:pad
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push %r9 // openbsd:align
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syscall
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pop %r9
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pop %r9
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mov %rax,%r12
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// Move data.
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mov %r12,%rdi
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mov $ape_ram_vaddr,%esi
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mov $ape_ram_filesz,%ecx
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rep movsb
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// Move code.
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mov %rbx,%rdi
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mov $8f,%esi
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mov $9f-8f,%ecx
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rep movsb
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// Change protection.
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mov -0x40(%rbp),%eax // __NR_mprotect
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mov %rbx,%rdi
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mov $PAGESIZE,%esi
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mov $PROT_READ|PROT_EXEC,%edx
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syscall
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jmp *%rbx
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// <LIMBO>
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// Unmap code segment.
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8: mov -0x18(%rbp),%eax // __NR_munmap
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mov $ape_rom_vaddr,%edi
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mov $ape_rom_filesz,%esi
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syscall
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// Unmap data segment.
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mov -0x18(%rbp),%eax // __NR_munmap
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mov $ape_ram_vaddr,%edi
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mov $ape_ram_filesz,%esi
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syscall
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// Open executable in read-write mode.
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mov -0x08(%rbp),%eax // __NR_open
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mov %r14,%rdi
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mov -0x20(%rbp),%esi // O_RDWR
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clc // clear carry flag
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syscall
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jc .Lohno // bsd error
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cmp $-4095,%eax
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jae .Lohno // linux error
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jmp .Lok
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// Open executable in read-only mode.
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.Lohno: mov -0x08(%rbp),%eax // __NR_open
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mov %r14,%rdi
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mov -0x48(%rbp),%esi // O_RDONLY
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syscall
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.Lok: mov %eax,%r15d
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// Map code segment.
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mov -0x10(%rbp),%eax // __NR_mmap
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mov $ape_rom_vaddr,%edi
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mov $ape_rom_filesz,%esi
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mov $PROT_READ|PROT_EXEC,%edx
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mov -0x38(%rbp),%r10d // MAP_FIXED
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or -0x30(%rbp),%r10d // MAP_PRIVATE
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mov %r15d,%r8d
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mov $ape_rom_offset,%r9d
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push %r9 // openbsd:pad
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push %r9 // openbsd:align
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syscall
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pop %r9
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pop %r9
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// Allocate data segment.
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mov -0x10(%rbp),%eax // __NR_mmap
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mov $ape_ram_vaddr,%edi
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mov $ape_ram_filesz,%esi
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mov $PROT_READ|PROT_WRITE,%edx
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mov -0x38(%rbp),%r10d // MAP_FIXED
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or -0x30(%rbp),%r10d // MAP_PRIVATE
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or -0x28(%rbp),%r10d // MAP_ANONYMOUS
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mov $-1,%r8
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mov $0,%r9
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push %r9 // openbsd:pad
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push %r9 // openbsd:align
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syscall
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pop %r9
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pop %r9
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// Put data back.
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mov $ape_ram_vaddr,%edi
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mov %r12,%rsi
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mov $ape_ram_filesz,%ecx
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rep movsb
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// Jump back.
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mov $9f,%eax
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jmp *%rax
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// </LIMBO>
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// Deallocate code buffer.
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9: mov __NR_munmap,%eax
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mov %rbx,%rdi
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mov $PAGESIZE,%esi
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syscall
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// Deallocate data buffer.
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mov __NR_munmap,%eax
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mov %r12,%rdi
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mov $ape_ram_filesz,%esi
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syscall
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mov %r15d,%eax
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pop %r15
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pop %r14
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pop %r12
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pop %rbx
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leave
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ret
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9: .endfn _OpenExecutable,globl
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.weak ape_rom_vaddr
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.weak ape_rom_filesz
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.weak ape_rom_offset
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.weak ape_ram_vaddr
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.weak ape_ram_filesz
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31
libc/runtime/openexecutable.c
Normal file
31
libc/runtime/openexecutable.c
Normal file
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@ -0,0 +1,31 @@
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 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/calls/calls.h"
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#include "libc/runtime/runtime.h"
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int _OpenExecutable(void) {
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tinyprint(2,
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"error: redbean StoreAsset() support is currently unavailable "
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"because _OpenExecutable() in a regressed state, due to the "
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"work we're doing on Arm64 support; we're hoping to address "
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"this soon; please try using redbean v2.2 or rewinding to "
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"commit 38112aeb206cc95ef615c268ca809cad693ecb9e\n",
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NULL);
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exit(1);
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}
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