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* mmap.cc: Make debug output more consistently. Fix some comments.

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(gen_protect): Convert to inline function.
	(gen_access): Ditto.
	(mmap_record::gen_protect): Add create parameter as in global function.
	(mmap_record::alloc_page_map): Change condition so that always the
	correct protection setting is set after mapping has been established.
	(mmap64): For anonymous mappings set offset always to 0.
	(fixup_mmaps_after_fork): Always call fixup_mmap_after_fork method
	with the MAP_FIXED flag set.
This commit is contained in:
Corinna Vinschen
2005-12-01 20:35:13 +00:00
parent c57b13f9f8
commit b534221080
2 changed files with 51 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,15 @@
2005-12-01 Corinna Vinschen <corinna@vinschen.de>
* mmap.cc: Make debug output more consistently. Fix some comments.
(gen_protect): Convert to inline function.
(gen_access): Ditto.
(mmap_record::gen_protect): Add create parameter as in global function.
(mmap_record::alloc_page_map): Change condition so that always the
correct protection setting is set after mapping has been established.
(mmap64): For anonymous mappings set offset always to 0.
(fixup_mmaps_after_fork): Always call fixup_mmap_after_fork method
with the MAP_FIXED flag set.
2005-12-01 Christopher Faylor <cgf@timesys.com>
* devices.h (_minor): Coerce argument to proper type before

75
winsup/cygwin/mmap.cc
View File

@@ -68,7 +68,7 @@ autogrow (int flags)
}
/* Generate Windows protection flags from mmap prot and flag values. */
static DWORD
static inline DWORD
gen_protect (int prot, int flags, bool create = false)
{
DWORD ret = PAGE_NOACCESS;
@@ -99,7 +99,7 @@ gen_protect (int prot, int flags, bool create = false)
/* Generate Windows access flags from mmap prot and flag values.
Only used on 9x. PROT_EXEC not supported here since it's not
necessary. */
static DWORD
static inline DWORD
gen_access (int prot, int flags)
{
DWORD ret = 0;
@@ -302,7 +302,7 @@ MapViewNT (HANDLE h, void *addr, size_t len, int prot, int flags, _off64_t off)
try again with NULL address. */
ret = NtMapViewOfSection (h, GetCurrentProcess (), &base, 0, size, &offset,
&size, ViewShare, 0, protect);
if (!NT_SUCCESS (ret) && addr && !fixed (flags))
if (!NT_SUCCESS (ret) && addr && !fixed (flags))
{
base = NULL;
ret = NtMapViewOfSection (h, GetCurrentProcess (), &base, 0, size,
@@ -313,8 +313,8 @@ MapViewNT (HANDLE h, void *addr, size_t len, int prot, int flags, _off64_t off)
base = NULL;
SetLastError (RtlNtStatusToDosError (ret));
}
debug_printf ("%x = NtMapViewOfSection (h:%x, addr:%x 0, len:%u, off:%D, "
"protect:%x,)", base, h, addr, len, off, protect);
debug_printf ("%x = NtMapViewOfSection (h:%x, addr:%x, len:%u, off:%D, "
"protect:%x, type:%x)", base, h, addr, len, off, protect, 0);
return base;
}
@@ -425,8 +425,8 @@ class mmap_record
fhandler_base *alloc_fh ();
void free_fh (fhandler_base *fh);
DWORD gen_protect () const
{ return ::gen_protect (get_prot (), get_flags ()); }
DWORD gen_protect (bool create = false) const
{ return ::gen_protect (get_prot (), get_flags (), create); }
DWORD gen_access () const
{ return ::gen_access (get_prot (), get_flags ()); }
bool compatible_flags (int fl) const;
@@ -469,8 +469,7 @@ class map
void del_list (unsigned i);
};
/* This is the global map structure pointer. It's allocated once on the
first call to mmap64(). */
/* This is the global map structure pointer. */
static map mmapped_areas;
bool
@@ -510,14 +509,16 @@ mmap_record::alloc_page_map ()
sizeof (DWORD))))
return false;
DWORD old_prot;
DWORD start_protect = gen_protect (true);
DWORD real_protect = gen_protect ();
if (real_protect != start_protect
&& !VirtualProtect (get_address (), get_len (),
real_protect, &start_protect))
system_printf ("Warning: VirtualProtect (addr: %p, len: 0x%x, "
"new_prot: 0x%x, old_prot: 0x%x), %E",
get_address (), get_len (),
real_protect, start_protect);
DWORD len = PAGE_CNT (get_len ());
DWORD protect = gen_protect ();
if (protect != PAGE_WRITECOPY && priv () && !anonymous ()
&& !VirtualProtect (get_address (), len * getpagesize (),
protect, &old_prot))
syscall_printf ("VirtualProtect(%x,%D,%d) failed, %E",
get_address (), len * getpagesize ());
while (len-- > 0)
MAP_SET (len);
return true;
@@ -586,10 +587,10 @@ mmap_record::unmap_pages (caddr_t addr, DWORD len)
if (anonymous () && priv () && noreserve ()
&& !VirtualFree (get_address () + off * getpagesize (),
len * getpagesize (), MEM_DECOMMIT))
syscall_printf ("VirtualFree in unmap_pages () failed, %E");
debug_printf ("VirtualFree in unmap_pages () failed, %E");
else if (!VirtualProtect (get_address () + off * getpagesize (),
len * getpagesize (), PAGE_NOACCESS, &old_prot))
syscall_printf ("VirtualProtect in unmap_pages () failed, %E");
debug_printf ("VirtualProtect in unmap_pages () failed, %E");
for (; len-- > 0; ++off)
MAP_CLR (off);
@@ -890,6 +891,7 @@ mmap64 (void *addr, size_t len, int prot, int flags, int fd, _off64_t off)
/* Anonymous mappings are always forced to pagesize length. */
len = PAGE_CNT (len) * pagesize;
flags |= MAP_ANONYMOUS;
off = 0;
}
else if (fh->get_device () == FH_FS)
{
@@ -1389,7 +1391,7 @@ fhandler_dev_zero::mmap (caddr_t *addr, size_t len, int prot,
{
VirtualFree (base, len, MEM_RELEASE);
set_errno (EINVAL);
syscall_printf ("VirtualAlloc: address shift with MAP_FIXED given");
debug_printf ("VirtualAlloc: address shift with MAP_FIXED given");
}
return INVALID_HANDLE_VALUE;
}
@@ -1402,7 +1404,7 @@ fhandler_dev_zero::mmap (caddr_t *addr, size_t len, int prot,
if (!h)
{
__seterrno ();
syscall_printf ("CreateMapping failed with %E");
debug_printf ("CreateMapping failed with %E");
return INVALID_HANDLE_VALUE;
}
@@ -1415,12 +1417,11 @@ fhandler_dev_zero::mmap (caddr_t *addr, size_t len, int prot,
{
UnmapViewOfFile (base);
set_errno (EINVAL);
syscall_printf ("MapView: address shift with MAP_FIXED given");
debug_printf ("MapView: address shift with MAP_FIXED given");
}
CloseHandle (h);
return INVALID_HANDLE_VALUE;
}
}
*addr = (caddr_t) base;
return h;
@@ -1460,9 +1461,9 @@ fhandler_dev_zero::fixup_mmap_after_fork (HANDLE h, int prot, int flags,
{
MEMORY_BASIC_INFORMATION m;
VirtualQuery (address, &m, sizeof (m));
system_printf ("requested %p != %p mem alloc base %p, state %p, "
"size %d, %E", address, base, m.AllocationBase, m.State,
m.RegionSize);
debug_printf ("requested %p != %p mem alloc base %p, state %p, "
"size %d, %E", address, base, m.AllocationBase, m.State,
m.RegionSize);
}
return base == address;
}
@@ -1477,7 +1478,7 @@ fhandler_disk_file::mmap (caddr_t *addr, size_t len, int prot,
if (!h)
{
__seterrno ();
syscall_printf ("CreateMapping failed with %E");
debug_printf ("CreateMapping failed with %E");
return INVALID_HANDLE_VALUE;
}
@@ -1490,7 +1491,7 @@ fhandler_disk_file::mmap (caddr_t *addr, size_t len, int prot,
{
UnmapViewOfFile (base);
set_errno (EINVAL);
syscall_printf ("MapView: address shift with MAP_FIXED given");
debug_printf ("MapView: address shift with MAP_FIXED given");
}
CloseHandle (h);
return INVALID_HANDLE_VALUE;
@@ -1546,7 +1547,7 @@ fhandler_dev_mem::mmap (caddr_t *addr, size_t len, int prot,
|| off + len >= mem_size)
{
set_errno (EINVAL);
syscall_printf ("-1 = mmap(): illegal parameter, set EINVAL");
debug_printf ("-1 = mmap(): illegal parameter, set EINVAL");
return INVALID_HANDLE_VALUE;
}
@@ -1573,7 +1574,7 @@ fhandler_dev_mem::mmap (caddr_t *addr, size_t len, int prot,
if (!NT_SUCCESS (ret))
{
__seterrno_from_nt_status (ret);
syscall_printf ("-1 = mmap(): NtOpenSection failed with %E");
debug_printf ("-1 = mmap(): NtOpenSection failed with %E");
return INVALID_HANDLE_VALUE;
}
@@ -1586,7 +1587,7 @@ fhandler_dev_mem::mmap (caddr_t *addr, size_t len, int prot,
{
NtUnmapViewOfSection (GetCurrentProcess (), base);
set_errno (EINVAL);
syscall_printf ("MapView: address shift with MAP_FIXED given");
debug_printf ("MapView: address shift with MAP_FIXED given");
}
CloseHandle (h);
return INVALID_HANDLE_VALUE;
@@ -1620,7 +1621,8 @@ fhandler_dev_mem::fixup_mmap_after_fork (HANDLE h, int prot, int flags,
_off64_t offset, DWORD size,
void *address)
{
void *base = MapViewNT (h, address, size, prot, flags | MAP_ANONYMOUS, offset);
void *base = MapViewNT (h, address, size, prot,
flags | MAP_ANONYMOUS, offset);
if (base != address)
{
MEMORY_BASIC_INFORMATION m;
@@ -1652,15 +1654,16 @@ fixup_mmaps_after_fork (HANDLE parent)
(rec = map_list->get_record (record_idx));
++record_idx)
{
debug_printf ("fd %d, h %x, access %x, offset %D, size %u, "
"address %p", rec->get_fd (), rec->get_handle (),
rec->gen_access (), rec->get_offset (),
rec->get_len (), rec->get_address ());
debug_printf ("fd %d, h 0x%x, address %p, len 0x%x, prot: 0x%x, "
"flags: 0x%x, offset %X",
rec->get_fd (), rec->get_handle (), rec->get_address (),
rec->get_len (), rec->get_prot (), rec->get_flags (),
rec->get_offset ());
fhandler_base *fh = rec->alloc_fh ();
bool ret = fh->fixup_mmap_after_fork (rec->get_handle (),
rec->get_prot (),
rec->get_flags (),
rec->get_flags () | MAP_FIXED,
rec->get_offset (),
rec->get_len (),
rec->get_address ());