mirror of
https://github.com/jart/cosmopolitan.git
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79 lines
3.4 KiB
C
79 lines
3.4 KiB
C
/*-*- 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 2022 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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#define ShouldUseMsabiAttribute() 1
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#include "libc/bits/asmflag.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/nt/enum/pageflags.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/sig.h"
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__msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect;
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static int64_t vector;
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static sigset_t oldss;
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static privileged void __morph_mprotect(void *addr, size_t size, int prot,
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int ntprot) {
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int ax, dx;
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uint32_t op;
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if (!IsWindows()) {
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asm volatile("syscall"
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: "=a"(ax), "=d"(dx)
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: "0"(__NR_mprotect), "D"(addr), "S"(size), "1"(prot)
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: "rcx", "r11", "memory");
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} else {
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__imp_VirtualProtect(addr, size, ntprot, &op);
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}
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}
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/**
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* Begins code morphing execuatble.
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*
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* @return 0 on success, or -1 w/ errno
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*/
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privileged void __morph_begin(void) {
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sigset_t ss;
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if (!IsWindows()) {
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sigfillset(&ss);
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sys_sigprocmask(SIG_BLOCK, &ss, &oldss);
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}
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__morph_mprotect(_base, __privileged_addr - _base, PROT_READ | PROT_WRITE,
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kNtPageWritecopy);
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}
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/**
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* Begins code morphing execuatble.
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*/
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privileged void __morph_end(void) {
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__morph_mprotect(_base, __privileged_addr - _base, PROT_READ | PROT_EXEC,
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kNtPageExecuteRead);
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if (!IsWindows()) {
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sys_sigprocmask(SIG_SETMASK, &oldss, 0);
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}
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}
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