JehanneOS/newlib
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Always move 64 bit main thread stack to defined pthread stack area

Browse Source 
x86_64 only:
        * dcrt0.cc (_dll_crt0): Always move stack to pthread stack area.
        Explain why.
        * miscfuncs.cc (create_new_main_thread_stack): New function to create
        OS-like stack for main thread in pthread stack area.
        * miscfuncs.cc (create_new_main_thread_stack): Declare.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-12-03 13:02:55 +01:00
parent 81e6c7515d
commit 8a14e51901
4 changed files with 83 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
winsup/cygwin/miscfuncs.cc
View File

@@ -760,6 +760,47 @@ public:
};
thread_allocator thr_alloc NO_COPY;
/* Just set up a system-like main thread stack from the pthread stack area
maintained by the thr_alloc class. See the description in the x86_64-only
code in _dll_crt0 to understand why we have to do this. */
PVOID
create_new_main_thread_stack (PVOID &allocationbase)
{
PIMAGE_DOS_HEADER dosheader;
PIMAGE_NT_HEADERS ntheader;
SIZE_T stacksize;
ULONG guardsize;
ULONG commitsize;
PBYTE stacklimit;
dosheader = (PIMAGE_DOS_HEADER) GetModuleHandle (NULL);
ntheader = (PIMAGE_NT_HEADERS)
((PBYTE) dosheader + dosheader->e_lfanew);
stacksize = ntheader->OptionalHeader.SizeOfStackReserve;
stacksize = roundup2 (stacksize, wincap.allocation_granularity ());
allocationbase
= thr_alloc.alloc (ntheader->OptionalHeader.SizeOfStackReserve);
guardsize = wincap.def_guard_page_size ();
commitsize = ntheader->OptionalHeader.SizeOfStackCommit;
commitsize = roundup2 (commitsize, wincap.page_size ());
if (commitsize > stacksize - guardsize - wincap.page_size ())
commitsize = stacksize - guardsize - wincap.page_size ();
stacklimit = (PBYTE) allocationbase + stacksize - commitsize - guardsize;
/* Setup guardpage. */
if (!VirtualAlloc (stacklimit, guardsize,
MEM_COMMIT, PAGE_READWRITE | PAGE_GUARD))
return NULL;
/* Setup committed region. */
stacklimit += guardsize;
if (!VirtualAlloc (stacklimit, commitsize, MEM_COMMIT, PAGE_READWRITE))
return NULL;
NtCurrentTeb()->Tib.StackBase = ((PBYTE) allocationbase + stacksize);
NtCurrentTeb()->Tib.StackLimit = stacklimit;
_main_tls = &_my_tls;
return stacklimit - 64;
}
#endif
HANDLE WINAPI