437 lines
8.9 KiB
C++
437 lines
8.9 KiB
C++
/* fhandler_mem.cc. See fhandler.h for a description of the fhandler classes.
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Copyright 2000, 2001, 2002, 2003, 2004, 2005 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <unistd.h>
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#include <sys/mman.h>
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#include <ntdef.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "ntdll.h"
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/**********************************************************************/
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/* fhandler_dev_mem */
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fhandler_dev_mem::fhandler_dev_mem ()
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: fhandler_base ()
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{
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}
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fhandler_dev_mem::~fhandler_dev_mem (void)
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{
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}
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int
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fhandler_dev_mem::open (int flags, mode_t)
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{
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if (!wincap.has_physical_mem_access ())
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{
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set_errno (ENOENT);
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debug_printf ("%s is accessible under NT/W2K only", dev ().name);
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return 0;
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}
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if (dev () == FH_MEM) /* /dev/mem */
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{
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NTSTATUS ret;
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SYSTEM_BASIC_INFORMATION sbi;
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if ((ret = NtQuerySystemInformation (SystemBasicInformation, (PVOID) &sbi,
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sizeof sbi, NULL)) != STATUS_SUCCESS)
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{
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__seterrno_from_nt_status (ret);
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debug_printf("NtQuerySystemInformation: ret %d, Dos(ret) %E", ret);
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mem_size = 0;
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}
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else
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mem_size = sbi.PhysicalPageSize * sbi.NumberOfPhysicalPages;
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debug_printf ("MemSize: %d MB", mem_size >> 20);
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}
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else if (dev () == FH_KMEM) /* /dev/kmem - Not yet supported */
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{
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mem_size = 0;
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debug_printf ("KMemSize: %d MB", mem_size >> 20);
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}
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else if (dev () == FH_PORT) /* /dev/port == First 64K of /dev/mem */
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{
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mem_size = 65536;
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debug_printf ("PortSize: 64 KB");
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}
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else
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{
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mem_size = 0;
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debug_printf ("Illegal minor number!!!");
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}
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/* Check for illegal flags. */
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if (flags & (O_APPEND | O_TRUNC | O_EXCL))
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{
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set_errno (EINVAL);
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return 0;
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}
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UNICODE_STRING memstr;
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RtlInitUnicodeString (&memstr, L"\\device\\physicalmemory");
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OBJECT_ATTRIBUTES attr;
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InitializeObjectAttributes (&attr, &memstr,
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OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
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NULL, NULL);
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ACCESS_MASK section_access;
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if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDONLY)
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{
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set_access (GENERIC_READ);
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section_access = SECTION_MAP_READ;
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}
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else if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_WRONLY)
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{
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set_access (GENERIC_WRITE);
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section_access = SECTION_MAP_READ | SECTION_MAP_WRITE;
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}
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else
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{
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set_access (GENERIC_READ | GENERIC_WRITE);
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section_access = SECTION_MAP_READ | SECTION_MAP_WRITE;
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}
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HANDLE mem;
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NTSTATUS ret = NtOpenSection (&mem, section_access, &attr);
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if (!NT_SUCCESS (ret))
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{
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__seterrno_from_nt_status (ret);
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set_io_handle (NULL);
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return 0;
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}
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set_io_handle (mem);
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set_open_status ();
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return 1;
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}
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int
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fhandler_dev_mem::write (const void *ptr, size_t ulen)
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{
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if (!ulen || pos >= mem_size)
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return 0;
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if (!(get_access () & GENERIC_WRITE))
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{
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set_errno (EINVAL);
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return -1;
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}
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if (pos + ulen > mem_size)
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ulen = mem_size - pos;
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PHYSICAL_ADDRESS phys;
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NTSTATUS ret;
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void *viewmem = NULL;
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DWORD len = ulen + getpagesize () - 1;
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phys.QuadPart = (ULONGLONG) pos;
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if ((ret = NtMapViewOfSection (get_handle (),
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INVALID_HANDLE_VALUE,
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&viewmem,
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0L,
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len,
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&phys,
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&len,
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ViewShare,
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0,
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PAGE_READONLY)) != STATUS_SUCCESS)
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{
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__seterrno_from_nt_status (ret);
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return -1;
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}
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memcpy ((char *) viewmem + (pos - phys.QuadPart), ptr, ulen);
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if (!NT_SUCCESS (ret = NtUnmapViewOfSection (INVALID_HANDLE_VALUE, viewmem)))
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{
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__seterrno_from_nt_status (ret);
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return -1;
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}
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pos += ulen;
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return ulen;
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}
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void __stdcall
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fhandler_dev_mem::read (void *ptr, size_t& ulen)
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{
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if (!ulen || pos >= mem_size)
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{
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ulen = 0;
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return;
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}
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if (!(get_access () & GENERIC_READ))
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{
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set_errno (EINVAL);
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ulen = (size_t) -1;
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return;
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}
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if (pos + ulen > mem_size)
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ulen = mem_size - pos;
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PHYSICAL_ADDRESS phys;
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NTSTATUS ret;
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void *viewmem = NULL;
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DWORD len = ulen + getpagesize () - 1;
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phys.QuadPart = (ULONGLONG) pos;
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if ((ret = NtMapViewOfSection (get_handle (),
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INVALID_HANDLE_VALUE,
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&viewmem,
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0L,
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len,
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&phys,
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&len,
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ViewShare,
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0,
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PAGE_READONLY)) != STATUS_SUCCESS)
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{
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__seterrno_from_nt_status (ret);
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ulen = (size_t) -1;
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return;
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}
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memcpy (ptr, (char *) viewmem + (pos - phys.QuadPart), ulen);
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if (!NT_SUCCESS (ret = NtUnmapViewOfSection (INVALID_HANDLE_VALUE, viewmem)))
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{
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__seterrno_from_nt_status (ret);
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ulen = (size_t) -1;
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return;
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}
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pos += ulen;
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return;
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}
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int
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fhandler_dev_mem::close (void)
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{
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return fhandler_base::close ();
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}
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_off64_t
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fhandler_dev_mem::lseek (_off64_t offset, int whence)
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{
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switch (whence)
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{
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case SEEK_SET:
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pos = offset;
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break;
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case SEEK_CUR:
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pos += offset;
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break;
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case SEEK_END:
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pos = mem_size;
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pos += offset;
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break;
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default:
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set_errno (EINVAL);
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return ILLEGAL_SEEK;
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}
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if (pos > mem_size)
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{
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set_errno (EINVAL);
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return ILLEGAL_SEEK;
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}
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return pos;
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}
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HANDLE
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fhandler_dev_mem::mmap (caddr_t *addr, size_t len, DWORD access,
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int flags, _off64_t off)
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{
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if (off >= mem_size
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|| (DWORD) len >= mem_size
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|| off + len >= mem_size)
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{
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set_errno (EINVAL);
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syscall_printf ("-1 = mmap(): illegal parameter, set EINVAL");
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return INVALID_HANDLE_VALUE;
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}
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UNICODE_STRING memstr;
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RtlInitUnicodeString (&memstr, L"\\device\\physicalmemory");
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OBJECT_ATTRIBUTES attr;
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InitializeObjectAttributes (&attr, &memstr,
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OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
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NULL, NULL);
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ACCESS_MASK section_access;
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ULONG protect;
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if (access & FILE_MAP_COPY)
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{
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section_access = SECTION_MAP_READ | SECTION_MAP_WRITE;
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protect = PAGE_WRITECOPY;
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}
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else if (access & FILE_MAP_WRITE)
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{
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section_access = SECTION_MAP_READ | SECTION_MAP_WRITE;
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protect = PAGE_READWRITE;
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}
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else
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{
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section_access = SECTION_MAP_READ;
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protect = PAGE_READONLY;
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}
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HANDLE h;
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NTSTATUS ret = NtOpenSection (&h, section_access, &attr);
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if (!NT_SUCCESS (ret))
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{
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__seterrno_from_nt_status (ret);
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syscall_printf ("-1 = mmap(): NtOpenSection failed with %E");
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return INVALID_HANDLE_VALUE;
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}
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PHYSICAL_ADDRESS phys;
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void *base = *addr;
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DWORD dlen = len;
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phys.QuadPart = (ULONGLONG) off;
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if ((ret = NtMapViewOfSection (h,
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INVALID_HANDLE_VALUE,
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&base,
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0L,
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dlen,
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&phys,
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&dlen,
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ViewShare /*??*/,
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0,
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protect)) != STATUS_SUCCESS)
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{
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__seterrno_from_nt_status (ret);
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syscall_printf ("-1 = mmap(): NtMapViewOfSection failed with %E");
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return INVALID_HANDLE_VALUE;
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}
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if ((flags & MAP_FIXED) && base != *addr)
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{
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set_errno (EINVAL);
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syscall_printf ("-1 = mmap(): address shift with MAP_FIXED given");
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NtUnmapViewOfSection (INVALID_HANDLE_VALUE, base);
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return INVALID_HANDLE_VALUE;
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}
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*addr = (caddr_t) base;
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return h;
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}
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int
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fhandler_dev_mem::munmap (HANDLE h, caddr_t addr, size_t len)
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{
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NTSTATUS ret;
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if (!NT_SUCCESS (ret = NtUnmapViewOfSection (INVALID_HANDLE_VALUE, addr)))
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{
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__seterrno_from_nt_status (ret);
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return -1;
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}
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CloseHandle (h);
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return 0;
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}
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int
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fhandler_dev_mem::msync (HANDLE h, caddr_t addr, size_t len, int flags)
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{
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return 0;
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}
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bool
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fhandler_dev_mem::fixup_mmap_after_fork (HANDLE h, DWORD access, int flags,
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_off64_t offset, DWORD size,
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void *address)
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{
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DWORD ret;
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PHYSICAL_ADDRESS phys;
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void *base = address;
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DWORD dlen = size;
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ULONG protect;
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if (access & FILE_MAP_COPY)
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protect = PAGE_WRITECOPY;
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else if (access & FILE_MAP_WRITE)
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protect = PAGE_READWRITE;
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else
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protect = PAGE_READONLY;
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phys.QuadPart = (ULONGLONG) offset;
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if ((ret = NtMapViewOfSection (h,
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INVALID_HANDLE_VALUE,
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&base,
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0L,
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dlen,
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&phys,
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&dlen,
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ViewShare /*??*/,
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0,
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protect)) != STATUS_SUCCESS)
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{
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__seterrno_from_nt_status (ret);
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syscall_printf ("-1 = fixup_mmap_after_fork(): NtMapViewOfSection failed with %E");
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return false;
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}
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return base == address;
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}
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int
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fhandler_dev_mem::fstat (struct __stat64 *buf)
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{
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fhandler_base::fstat (buf);
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buf->st_blksize = getpagesize ();
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if (is_auto_device ())
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{
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buf->st_mode = S_IFCHR;
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if (wincap.has_physical_mem_access ())
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buf->st_mode |= S_IRUSR | S_IWUSR |
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S_IRGRP | S_IWGRP |
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S_IROTH | S_IWOTH;
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}
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return 0;
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}
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int
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fhandler_dev_mem::dup (fhandler_base *child)
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{
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int ret = fhandler_base::dup (child);
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if (! ret)
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{
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fhandler_dev_mem *fhc = (fhandler_dev_mem *) child;
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fhc->mem_size = mem_size;
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fhc->pos = pos;
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}
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return ret;
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}
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void
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fhandler_dev_mem::dump ()
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{
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paranoid_printf ("here, fhandler_dev_mem");
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}
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