cosmopolitan/libc/intrin/virtualprotect.c

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
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│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/log/libfatal.internal.h"
#include "libc/nt/memory.h"

__msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect;

/**
 * Protects memory on the New Technology.
 * @note this wrapper takes care of ABI, STRACE(), and __winerr()
 */
textwindows bool32 VirtualProtect(void *lpAddress, uint64_t dwSize,
                                  uint32_t flNewProtect,
                                  uint32_t *lpflOldProtect) {
  bool32 bOk;
  char oldbuf[64];
  bOk = __imp_VirtualProtect(lpAddress, dwSize, flNewProtect, lpflOldProtect);
  if (!bOk) __winerr();
  NTTRACE("VirtualProtect(%p, %'zu, %s, [%s]) → %hhhd% m", lpAddress, dwSize,
          DescribeNtPageFlags(flNewProtect),
          DescribeNtPageFlags(*lpflOldProtect), bOk);
  return bOk;
}