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newlib/winsup/cygwin/miscfuncs.cc
Corinna Vinschen a54bc198b1 Implement correct RLIMIT_STACK handling 
* miscfuncs.cc (struct pthread_wrapper_arg): Add member guardsize.
        (pthread_wrapper): Set thread stack guarantee according to guardsize.
        Tweak assembler code so that $rax/$eax is not required by GCC to
        prepare the wrapper_arg value.
        (CygwinCreateThread): Fix deadzone handling.  Drop setting a "POSIX"
        guardpage (aka page w/ PAGE_NOACCESS).  Always use Windows guard
        pages instead.  On post-XP systems (providing SetThreadStackGuarantee)
        always set up stack Windows like with reserved/commited areas and
        movable guard pages.  Only on XP set up stack fully commited if the
        guardpage size is not the default system guardpage size.
        Fill out pthread_wrapper_arg::guardsize.  Improve comments.
        * resource.cc: Implement RSTACK_LIMIT Linux-like.
        (DEFAULT_STACKSIZE): New macro.
        (DEFAULT_STACKGUARD): Ditto.
        (rlimit_stack_guard): New muto.
        (rlimit_stack): New global variable holding current RSTACK_LIMIT values.
        (__set_rlimit_stack): Set rlimit_stack under lock.
        (__get_rlimit_stack): Initialize rlimit_stack from executable header
        and return rlimit_stack values under lock.
        (get_rlimit_stack): Filtering function to return useful default
        stacksize from rlimit_stack.rlim_cur value.
        (getrlimit): Call __get_rlimit_stack in RLIMIT_STACK case.
        (setrlimit): Call __set_rlimit_stack in RLIMIT_STACK case.
        * thread.cc (pthread::create): Fetch default stacksize calling
        get_rlimit_stack.
        (pthread_attr::pthread_attr): Fetch default guardsize calling
        wincap.def_guard_page_size.
        (pthread_attr_getstacksize): Fetch default stacksize calling
        get_rlimit_stack.
        * thread.h (PTHREAD_DEFAULT_STACKSIZE): Remove.
        (PTHREAD_DEFAULT_GUARDSIZE): Remove.
        (get_rlimit_stack): Declare.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2015-07-05 15:51:37 +02:00

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/* miscfuncs.cc: misc funcs that don't belong anywhere else
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "miscfuncs.h"
#include <sys/uio.h>
#include <assert.h>
#include <alloca.h>
#include <limits.h>
#include <sys/param.h>
#include <wchar.h>
#include "cygtls.h"
#include "ntdll.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "pinfo.h"
#include "exception.h"
#include "sigproc.h"
long tls_ix = -1;
const unsigned char case_folded_lower[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, '!', '"', '#', '$', '%', '&', 39, '(', ')', '*', '+', ',', '-', '.', '/',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?',
'@', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '[', 92, ']', '^', '_',
'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~', 127,
128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
};
const unsigned char case_folded_upper[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, '!', '"', '#', '$', '%', '&', 39, '(', ')', '*', '+', ',', '-', '.', '/',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?',
'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', 92, ']', '^', '_',
'`', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '{', '|', '}', '~', 127,
128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
};
const char isalpha_array[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, 0, 0, 0, 0, 0,
0,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
extern "C" int __stdcall
cygwin_wcscasecmp (const wchar_t *ws, const wchar_t *wt)
{
UNICODE_STRING us, ut;
RtlInitUnicodeString (&us, ws);
RtlInitUnicodeString (&ut, wt);
return RtlCompareUnicodeString (&us, &ut, TRUE);
}
extern "C" int __stdcall
cygwin_wcsncasecmp (const wchar_t *ws, const wchar_t *wt, size_t n)
{
UNICODE_STRING us, ut;
size_t ls = 0, lt = 0;
while (ws[ls] && ls < n)
++ls;
RtlInitCountedUnicodeString (&us, ws, ls * sizeof (WCHAR));
while (wt[lt] && lt < n)
++lt;
RtlInitCountedUnicodeString (&ut, wt, lt * sizeof (WCHAR));
return RtlCompareUnicodeString (&us, &ut, TRUE);
}
extern "C" int __stdcall
cygwin_strcasecmp (const char *cs, const char *ct)
{
UNICODE_STRING us, ut;
ULONG len;
len = (strlen (cs) + 1) * sizeof (WCHAR);
RtlInitEmptyUnicodeString (&us, (PWCHAR) alloca (len), len);
us.Length = sys_mbstowcs (us.Buffer, us.MaximumLength, cs) * sizeof (WCHAR);
len = (strlen (ct) + 1) * sizeof (WCHAR);
RtlInitEmptyUnicodeString (&ut, (PWCHAR) alloca (len), len);
ut.Length = sys_mbstowcs (ut.Buffer, ut.MaximumLength, ct) * sizeof (WCHAR);
return RtlCompareUnicodeString (&us, &ut, TRUE);
}
extern "C" int __stdcall
cygwin_strncasecmp (const char *cs, const char *ct, size_t n)
{
UNICODE_STRING us, ut;
ULONG len;
size_t ls = 0, lt = 0;
while (cs[ls] && ls < n)
++ls;
len = (ls + 1) * sizeof (WCHAR);
RtlInitEmptyUnicodeString (&us, (PWCHAR) alloca (len), len);
us.Length = sys_mbstowcs (us.Buffer, ls + 1, cs, ls) * sizeof (WCHAR);
while (ct[lt] && lt < n)
++lt;
len = (lt + 1) * sizeof (WCHAR);
RtlInitEmptyUnicodeString (&ut, (PWCHAR) alloca (len), len);
ut.Length = sys_mbstowcs (ut.Buffer, lt + 1, ct, lt) * sizeof (WCHAR);
return RtlCompareUnicodeString (&us, &ut, TRUE);
}
extern "C" char *
strlwr (char *string)
{
UNICODE_STRING us;
size_t len = (strlen (string) + 1) * sizeof (WCHAR);
us.MaximumLength = len; us.Buffer = (PWCHAR) alloca (len);
us.Length = sys_mbstowcs (us.Buffer, len, string) * sizeof (WCHAR)
- sizeof (WCHAR);
RtlDowncaseUnicodeString (&us, &us, FALSE);
sys_wcstombs (string, len / sizeof (WCHAR), us.Buffer);
return string;
}
extern "C" char *
strupr (char *string)
{
UNICODE_STRING us;
size_t len = (strlen (string) + 1) * sizeof (WCHAR);
us.MaximumLength = len; us.Buffer = (PWCHAR) alloca (len);
us.Length = sys_mbstowcs (us.Buffer, len, string) * sizeof (WCHAR)
- sizeof (WCHAR);
RtlUpcaseUnicodeString (&us, &us, FALSE);
sys_wcstombs (string, len / sizeof (WCHAR), us.Buffer);
return string;
}
int __reg2
check_invalid_virtual_addr (const void *s, unsigned sz)
{
MEMORY_BASIC_INFORMATION mbuf;
const void *end;
for (end = (char *) s + sz; s < end;
s = (char *) mbuf.BaseAddress + mbuf.RegionSize)
if (!VirtualQuery (s, &mbuf, sizeof mbuf))
return EINVAL;
return 0;
}
static char __attribute__ ((noinline))
dummytest (volatile char *p)
{
return *p;
}
ssize_t
check_iovec (const struct iovec *iov, int iovcnt, bool forwrite)
{
if (iovcnt < 0 || iovcnt > IOV_MAX)
{
set_errno (EINVAL);
return -1;
}
__try
{
size_t tot = 0;
while (iovcnt != 0)
{
if (iov->iov_len > SSIZE_MAX || (tot += iov->iov_len) > SSIZE_MAX)
{
set_errno (EINVAL);
__leave;
}
volatile char *p = ((char *) iov->iov_base) + iov->iov_len - 1;
if (!iov->iov_len)
/* nothing to do */;
else if (!forwrite)
*p = dummytest (p);
else
dummytest (p);
iov++;
iovcnt--;
}
assert (tot <= SSIZE_MAX);
return (ssize_t) tot;
}
__except (EFAULT)
__endtry
return -1;
}
/* Try hard to schedule another thread.
Remember not to call this in a lock condition or you'll potentially
suffer starvation. */
void
yield ()
{
int prio = GetThreadPriority (GetCurrentThread ());
SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_IDLE);
/* MSDN implies that SleepEx will force scheduling of other threads.
Unlike SwitchToThread() the documentation does not mention other
cpus so, presumably (hah!), this + using a lower priority will
stall this thread temporarily and cause another to run.
(stackoverflow and others seem to confirm that setting this thread
to a lower priority and calling Sleep with a 0 paramenter will
have this desired effect) */
Sleep (0L);
SetThreadPriority (GetCurrentThread (), prio);
}
/* Get a default value for the nice factor. When changing these values,
have a look into the below function nice_to_winprio. The values must
match the layout of the static "priority" array. */
int
winprio_to_nice (DWORD prio)
{
switch (prio)
{
case REALTIME_PRIORITY_CLASS:
return -20;
case HIGH_PRIORITY_CLASS:
return -16;
case ABOVE_NORMAL_PRIORITY_CLASS:
return -8;
case NORMAL_PRIORITY_CLASS:
return 0;
case BELOW_NORMAL_PRIORITY_CLASS:
return 8;
case IDLE_PRIORITY_CLASS:
return 16;
}
return 0;
}
/* Get a Win32 priority matching the incoming nice factor. The incoming
nice is limited to the interval [-NZERO,NZERO-1]. */
DWORD
nice_to_winprio (int &nice)
{
static const DWORD priority[] =
{
REALTIME_PRIORITY_CLASS, /* 0 */
HIGH_PRIORITY_CLASS, /* 1 */
HIGH_PRIORITY_CLASS,
HIGH_PRIORITY_CLASS,
HIGH_PRIORITY_CLASS,
HIGH_PRIORITY_CLASS,
HIGH_PRIORITY_CLASS,
HIGH_PRIORITY_CLASS, /* 7 */
ABOVE_NORMAL_PRIORITY_CLASS, /* 8 */
ABOVE_NORMAL_PRIORITY_CLASS,
ABOVE_NORMAL_PRIORITY_CLASS,
ABOVE_NORMAL_PRIORITY_CLASS,
ABOVE_NORMAL_PRIORITY_CLASS,
ABOVE_NORMAL_PRIORITY_CLASS,
ABOVE_NORMAL_PRIORITY_CLASS,
ABOVE_NORMAL_PRIORITY_CLASS, /* 15 */
NORMAL_PRIORITY_CLASS, /* 16 */
NORMAL_PRIORITY_CLASS,
NORMAL_PRIORITY_CLASS,
NORMAL_PRIORITY_CLASS,
NORMAL_PRIORITY_CLASS,
NORMAL_PRIORITY_CLASS,
NORMAL_PRIORITY_CLASS,
NORMAL_PRIORITY_CLASS, /* 23 */
BELOW_NORMAL_PRIORITY_CLASS, /* 24 */
BELOW_NORMAL_PRIORITY_CLASS,
BELOW_NORMAL_PRIORITY_CLASS,
BELOW_NORMAL_PRIORITY_CLASS,
BELOW_NORMAL_PRIORITY_CLASS,
BELOW_NORMAL_PRIORITY_CLASS,
BELOW_NORMAL_PRIORITY_CLASS,
BELOW_NORMAL_PRIORITY_CLASS, /* 31 */
IDLE_PRIORITY_CLASS, /* 32 */
IDLE_PRIORITY_CLASS,
IDLE_PRIORITY_CLASS,
IDLE_PRIORITY_CLASS,
IDLE_PRIORITY_CLASS,
IDLE_PRIORITY_CLASS,
IDLE_PRIORITY_CLASS,
IDLE_PRIORITY_CLASS /* 39 */
};
if (nice < -NZERO)
nice = -NZERO;
else if (nice > NZERO - 1)
nice = NZERO - 1;
DWORD prio = priority[nice + NZERO];
return prio;
}
/* Minimal overlapped pipe I/O implementation for signal and commune stuff. */
BOOL WINAPI
CreatePipeOverlapped (PHANDLE hr, PHANDLE hw, LPSECURITY_ATTRIBUTES sa)
{
int ret = fhandler_pipe::create (sa, hr, hw, 0, NULL,
FILE_FLAG_OVERLAPPED);
if (ret)
SetLastError (ret);
return ret == 0;
}
BOOL WINAPI
ReadPipeOverlapped (HANDLE h, PVOID buf, DWORD len, LPDWORD ret_len,
DWORD timeout)
{
OVERLAPPED ov;
BOOL ret;
memset (&ov, 0, sizeof ov);
ov.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
ret = ReadFile (h, buf, len, NULL, &ov);
if (ret || GetLastError () == ERROR_IO_PENDING)
{
if (!ret && WaitForSingleObject (ov.hEvent, timeout) != WAIT_OBJECT_0)
CancelIo (h);
ret = GetOverlappedResult (h, &ov, ret_len, FALSE);
}
CloseHandle (ov.hEvent);
return ret;
}
BOOL WINAPI
WritePipeOverlapped (HANDLE h, LPCVOID buf, DWORD len, LPDWORD ret_len,
DWORD timeout)
{
OVERLAPPED ov;
BOOL ret;
memset (&ov, 0, sizeof ov);
ov.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
ret = WriteFile (h, buf, len, NULL, &ov);
if (ret || GetLastError () == ERROR_IO_PENDING)
{
if (!ret && WaitForSingleObject (ov.hEvent, timeout) != WAIT_OBJECT_0)
CancelIo (h);
ret = GetOverlappedResult (h, &ov, ret_len, FALSE);
}
CloseHandle (ov.hEvent);
return ret;
}
bool
NT_readline::init (POBJECT_ATTRIBUTES attr, PCHAR in_buf, ULONG in_buflen)
{
NTSTATUS status;
IO_STATUS_BLOCK io;
status = NtOpenFile (&fh, SYNCHRONIZE | FILE_READ_DATA, attr, &io,
FILE_SHARE_VALID_FLAGS,
FILE_SYNCHRONOUS_IO_NONALERT
| FILE_OPEN_FOR_BACKUP_INTENT);
if (!NT_SUCCESS (status))
{
paranoid_printf ("NtOpenFile(%S) failed, status %y",
attr->ObjectName, status);
return false;
}
buf = in_buf;
buflen = in_buflen;
got = end = buf;
len = 0;
line = 1;
return true;
}
PCHAR
NT_readline::gets ()
{
IO_STATUS_BLOCK io;
while (true)
{
/* len == 0 indicates we have to read from the file. */
if (!len)
{
if (!NT_SUCCESS (NtReadFile (fh, NULL, NULL, NULL, &io, got,
(buflen - 2) - (got - buf), NULL, NULL)))
return NULL;
len = io.Information;
/* Set end marker. */
got[len] = got[len + 1] = '\0';
/* Set len to the absolute len of bytes in buf. */
len += got - buf;
/* Reset got to start reading at the start of the buffer again. */
got = end = buf;
}
else
{
got = end + 1;
++line;
}
/* Still some valid full line? */
if (got < buf + len)
{
if ((end = strchr (got, '\n')))
{
end[end[-1] == '\r' ? -1 : 0] = '\0';
return got;
}
/* Last line missing a \n at EOF? */
if (len < buflen - 2)
{
len = 0;
return got;
}
}
/* We have to read once more. Move remaining bytes to the start of
the buffer and reposition got so that it points to the end of
the remaining bytes. */
len = buf + len - got;
memmove (buf, got, len);
got = buf + len;
buf[len] = buf[len + 1] = '\0';
len = 0;
}
}
/* backslashify: Convert all forward slashes in src path to back slashes
in dst path. Add a trailing slash to dst when trailing_slash_p arg
is set to 1. */
void
backslashify (const char *src, char *dst, bool trailing_slash_p)
{
const char *start = src;
while (*src)
{
if (*src == '/')
*dst++ = '\\';
else
*dst++ = *src;
++src;
}
if (trailing_slash_p
&& src > start
&& !isdirsep (src[-1]))
*dst++ = '\\';
*dst++ = 0;
}
/* slashify: Convert all back slashes in src path to forward slashes
in dst path. Add a trailing slash to dst when trailing_slash_p arg
is set to 1. */
void
slashify (const char *src, char *dst, bool trailing_slash_p)
{
const char *start = src;
while (*src)
{
if (*src == '\\')
*dst++ = '/';
else
*dst++ = *src;
++src;
}
if (trailing_slash_p
&& src > start
&& !isdirsep (src[-1]))
*dst++ = '/';
*dst++ = 0;
}
/* Return an address from the import jmp table of main program. */
void * __reg1
__import_address (void *imp)
{
__try
{
if (*((uint16_t *) imp) == 0x25ff)
{
const char *ptr = (const char *) imp;
#ifdef __x86_64__
const uintptr_t *jmpto = (uintptr_t *)
(ptr + 6 + *(int32_t *)(ptr + 2));
#else
const uintptr_t *jmpto = (uintptr_t *) *((uintptr_t *) (ptr + 2));
#endif
return (void *) *jmpto;
}
}
__except (NO_ERROR) {}
__endtry
return NULL;
}
/* Helper function to generate the correct caller address. For external
calls, the return address on the stack is _sigbe. In that case the
actual caller return address is on the cygtls stack. Use this function
via the macro caller_return_address. */
extern "C" void _sigbe ();
void *
__caller_return_address (void *builtin_ret_addr)
{
return builtin_ret_addr == &_sigbe
? (void *) _my_tls.retaddr () : builtin_ret_addr;
}
/* CygwinCreateThread.
Replacement function for CreateThread. What we do here is to remove
parameters we don't use and instead to add parameters we need to make
the function pthreads compatible. */
struct pthread_wrapper_arg
{
LPTHREAD_START_ROUTINE func;
PVOID arg;
PBYTE stackaddr;
PBYTE stackbase;
PBYTE stacklimit;
ULONG guardsize;
};
DWORD WINAPI
pthread_wrapper (PVOID arg)
{
/* Just plain paranoia. */
if (!arg)
return ERROR_INVALID_PARAMETER;
/* The process is now threaded. Note for later usage by arc4random. */
__isthreaded = 1;
/* Fetch thread wrapper info and free from cygheap. */
pthread_wrapper_arg wrapper_arg = *(pthread_wrapper_arg *) arg;
cfree (arg);
/* Set stack values in TEB */
PTEB teb = NtCurrentTeb ();
teb->Tib.StackBase = wrapper_arg.stackbase;
teb->Tib.StackLimit = wrapper_arg.stacklimit ?: wrapper_arg.stackaddr;
/* Set DeallocationStack value. If we have an application-provided stack,
we set DeallocationStack to NULL, so NtTerminateThread does not deallocate
any stack. If we created the stack in CygwinCreateThread, we set
DeallocationStack to the stackaddr of our own stack, so it's automatically
deallocated when the thread is terminated. */
PBYTE dealloc_addr = (PBYTE) teb->DeallocationStack;
teb->DeallocationStack = wrapper_arg.stacklimit ? wrapper_arg.stackaddr
: NULL;
/* Store the OS-provided DeallocationStack address in wrapper_arg.stackaddr.
The below assembler code will release the OS stack after switching to our
new stack. */
wrapper_arg.stackaddr = dealloc_addr;
/* On post-XP systems, set thread stack guarantee matching the guardsize.
Note that the guardsize is one page bigger than the guarantee. */
if (wincap.has_set_thread_stack_guarantee ()
&& wrapper_arg.guardsize > wincap.def_guard_page_size ())
{
wrapper_arg.guardsize -= wincap.page_size ();
SetThreadStackGuarantee (&wrapper_arg.guardsize);
}
/* Initialize new _cygtls. */
_my_tls.init_thread (wrapper_arg.stackbase - CYGTLS_PADSIZE,
(DWORD (*)(void*, void*)) wrapper_arg.func);
#ifndef __x86_64__
/* Copy exception list over to new stack. I'm not quite sure how the
exception list is extended by Windows itself. What's clear is that it
always grows downwards and that it starts right at the stackbase.
Therefore we first count the number of exception records and place
the copy at the stackbase, too, so there's still a lot of room to
extend the list up to where our _cygtls region starts. */
_exception_list *old_start = (_exception_list *) teb->Tib.ExceptionList;
unsigned count = 0;
teb->Tib.ExceptionList = NULL;
for (_exception_list *e_ptr = old_start;
e_ptr && e_ptr != (_exception_list *) -1;
e_ptr = e_ptr->prev)
++count;
if (count)
{
_exception_list *new_start = (_exception_list *) wrapper_arg.stackbase
- count;
teb->Tib.ExceptionList = (struct _EXCEPTION_REGISTRATION_RECORD *)
new_start;
while (true)
{
new_start->handler = old_start->handler;
if (old_start->prev == (_exception_list *) -1)
{
new_start->prev = (_exception_list *) -1;
break;
}
new_start->prev = new_start + 1;
new_start = new_start->prev;
old_start = old_start->prev;
}
}
#endif
#ifdef __x86_64__
__asm__ ("\n\
leaq %[WRAPPER_ARG], %%rbx # Load &wrapper_arg into rbx \n\
movq (%%rbx), %%r12 # Load thread func into r12 \n\
movq 8(%%rbx), %%r13 # Load thread arg into r13 \n\
movq 16(%%rbx), %%rcx # Load stackaddr into rcx \n\
movq 24(%%rbx), %%rsp # Load stackbase into rsp \n\
subq %[CYGTLS], %%rsp # Subtract CYGTLS_PADSIZE \n\
# (here we are 16 bytes aligned)\n\
subq $32, %%rsp # Subtract another 32 bytes \n\
# (shadow space for arg regs) \n\
xorq %%rbp, %%rbp # Set rbp to 0 \n\
# We moved to the new stack. \n\
# Now it's safe to release the OS stack. \n\
movl $0x8000, %%r8d # dwFreeType: MEM_RELEASE \n\
xorl %%edx, %%edx # dwSize: 0 \n\
# dwAddress is already in the correct arg register rcx \n\
call VirtualFree \n\
# All set. We can copy the thread arg from the safe \n\
# register r13 and then just call the function. \n\
movq %%r13, %%rcx # Move thread arg to 1st arg reg\n\
call *%%r12 # Call thread func \n"
: : [WRAPPER_ARG] "o" (wrapper_arg),
[CYGTLS] "i" (CYGTLS_PADSIZE));
#else
__asm__ ("\n\
leal %[WRAPPER_ARG], %%ebx # Load &wrapper_arg into ebx \n\
movl (%%ebx), %%eax # Load thread func into eax \n\
movl 4(%%ebx), %%ecx # Load thread arg into ecx \n\
movl 8(%%ebx), %%edx # Load stackaddr into edx \n\
movl 12(%%ebx), %%ebx # Load stackbase into ebx \n\
subl %[CYGTLS], %%ebx # Subtract CYGTLS_PADSIZE \n\
subl $4, %%ebx # Subtract another 4 bytes \n\
movl %%ebx, %%esp # Set esp \n\
xorl %%ebp, %%ebp # Set ebp to 0 \n\
# Make gcc 3.x happy and align the stack so that it is \n\
# 16 byte aligned right before the final call opcode. \n\
andl $-16, %%esp # 16 byte align \n\
addl $-12, %%esp # 12 bytes + 4 byte arg = 16 \n\
# Now we moved to the new stack. Save thread func address \n\
# and thread arg on new stack \n\
pushl %%ecx # Push thread arg onto stack \n\
pushl %%eax # Push thread func onto stack \n\
# Now it's safe to release the OS stack. \n\
pushl $0x8000 # dwFreeType: MEM_RELEASE \n\
pushl $0x0 # dwSize: 0 \n\
pushl %%edx # lpAddress: stackaddr \n\
call _VirtualFree@12 # Shoot \n\
# All set. We can pop the thread function address from \n\
# the stack and call it. The thread arg is still on the \n\
# stack in the expected spot. \n\
popl %%eax # Pop thread_func address \n\
call *%%eax # Call thread func \n"
: : [WRAPPER_ARG] "o" (wrapper_arg),
[CYGTLS] "i" (CYGTLS_PADSIZE));
#endif
/* pthread::thread_init_wrapper calls pthread::exit, which
in turn calls ExitThread, so we should never arrive here. */
api_fatal ("Dumb thinko in pthread handling. Whip the developer.");
}
#ifdef __x86_64__
/* The memory region used for thread stacks */
#define THREAD_STORAGE_LOW 0x080000000L
#define THREAD_STORAGE_HIGH 0x100000000L
/* We provide the stacks always in 1 Megabyte slots */
#define THREAD_STACK_SLOT 0x100000L /* 1 Meg */
/* Maximum stack size returned from the pool. */
#define THREAD_STACK_MAX 0x20000000L /* 512 Megs */
class thread_allocator
{
UINT_PTR current;
public:
thread_allocator () : current (THREAD_STORAGE_HIGH) {}
PVOID alloc (SIZE_T size)
{
SIZE_T real_size = roundup2 (size, THREAD_STACK_SLOT);
BOOL overflow = FALSE;
PVOID real_stackaddr = NULL;
/* If an application requests a monster stack, we fulfill this request
from outside of our pool, top down. */
if (real_size > THREAD_STACK_MAX)
return VirtualAlloc (NULL, real_size, MEM_RESERVE | MEM_TOP_DOWN,
PAGE_READWRITE);
/* Simple round-robin. Keep looping until VirtualAlloc succeeded, or
until we overflowed and hit the current address. */
for (UINT_PTR addr = current - real_size;
!real_stackaddr && (!overflow || addr >= current);
addr -= THREAD_STACK_SLOT)
{
if (addr < THREAD_STORAGE_LOW)
{
addr = THREAD_STORAGE_HIGH - real_size;
overflow = TRUE;
}
real_stackaddr = VirtualAlloc ((PVOID) addr, real_size,
MEM_RESERVE, PAGE_READWRITE);
if (!real_stackaddr)
{
/* So we couldn't grab this space. Let's check the state.
If this area is free, simply try the next lower 1 Meg slot.
Otherwise, shift the next try down to the AllocationBase
of the current address, minus the requested slot size.
Add THREAD_STACK_SLOT since that's subtracted in the next
run of the loop anyway. */
MEMORY_BASIC_INFORMATION mbi;
VirtualQuery ((PVOID) addr, &mbi, sizeof mbi);
if (mbi.State != MEM_FREE)
addr = (UINT_PTR) mbi.AllocationBase - real_size
+ THREAD_STACK_SLOT;
}
}
/* If we got an address, remember it for the next allocation attempt. */
if (real_stackaddr)
current = (UINT_PTR) real_stackaddr;
return real_stackaddr;
}
};
thread_allocator thr_alloc NO_COPY;
#endif
HANDLE WINAPI
CygwinCreateThread (LPTHREAD_START_ROUTINE thread_func, PVOID thread_arg,
PVOID stackaddr, ULONG stacksize, ULONG guardsize,
DWORD creation_flags, LPDWORD thread_id)
{
PVOID real_stackaddr = NULL;
ULONG real_stacksize = 0;
ULONG real_guardsize = 0;
pthread_wrapper_arg *wrapper_arg;
HANDLE thread = NULL;
wrapper_arg = (pthread_wrapper_arg *) ccalloc (HEAP_STR, 1,
sizeof *wrapper_arg);
if (!wrapper_arg)
{
SetLastError (ERROR_OUTOFMEMORY);
return NULL;
}
wrapper_arg->func = thread_func;
wrapper_arg->arg = thread_arg;
if (stackaddr)
{
/* If the application provided the stack, just use it. There won't
be any stack overflow handling! */
wrapper_arg->stackaddr = (PBYTE) stackaddr;
wrapper_arg->stackbase = (PBYTE) stackaddr + stacksize;
}
else
{
PBYTE real_stacklimit;
/* If not, we have to create the stack here. */
real_stacksize = roundup2 (stacksize, wincap.page_size ());
real_guardsize = roundup2 (guardsize, wincap.page_size ());
/* Add the guardsize to the stacksize */
real_stacksize += real_guardsize;
/* Take dead zone page into account, which always stays uncommited. */
real_stacksize += wincap.page_size ();
/* Now roundup the result to the next allocation boundary. */
real_stacksize = roundup2 (real_stacksize,
wincap.allocation_granularity ());
/* Reserve stack. */
#ifdef __x86_64__
real_stackaddr = thr_alloc.alloc (real_stacksize);
#else
/* FIXME? If the TOP_DOWN method tends to collide too much with
other stuff, we should provide our own mechanism to find a
suitable place for the stack. Top down from the start of
the Cygwin DLL comes to mind. */
real_stackaddr = VirtualAlloc (NULL, real_stacksize,
MEM_RESERVE | MEM_TOP_DOWN,
PAGE_READWRITE);
#endif
if (!real_stackaddr)
return NULL;
/* Set up committed region. We have two cases: */
if (!wincap.has_set_thread_stack_guarantee ()
&& real_guardsize != wincap.def_guard_page_size ())
{
/* If guardsize is set to something other than the default guard page
size, and if we're running on Windows XP 32 bit, we commit the
entire stack, and, if guardsize is > 0, set up a guard page. */
real_stacklimit = (PBYTE) real_stackaddr + wincap.page_size ();
if (real_guardsize
&& !VirtualAlloc (real_stacklimit, real_guardsize, MEM_COMMIT,
PAGE_READWRITE | PAGE_GUARD))
goto err;
real_stacklimit += real_guardsize;
if (!VirtualAlloc (real_stacklimit, real_stacksize - real_guardsize
- wincap.page_size (),
MEM_COMMIT, PAGE_READWRITE))
goto err;
}
else
{
/* Otherwise we set up the stack like the OS does, with a reserved
region, the guard pages, and a commited region. We commit the
stack commit size from the executable header, but at least
PTHREAD_STACK_MIN (64K). */
static ULONG exe_commitsize;
if (!exe_commitsize)
{
PIMAGE_DOS_HEADER dosheader;
PIMAGE_NT_HEADERS ntheader;
dosheader = (PIMAGE_DOS_HEADER) GetModuleHandle (NULL);
ntheader = (PIMAGE_NT_HEADERS)
((PBYTE) dosheader + dosheader->e_lfanew);
exe_commitsize = ntheader->OptionalHeader.SizeOfStackCommit;
exe_commitsize = roundup2 (exe_commitsize, wincap.page_size ());
}
ULONG commitsize = exe_commitsize;
if (commitsize > real_stacksize - real_guardsize
- wincap.page_size ())
commitsize = real_stacksize - real_guardsize - wincap.page_size ();
else if (commitsize < PTHREAD_STACK_MIN)
commitsize = PTHREAD_STACK_MIN;
real_stacklimit = (PBYTE) real_stackaddr + real_stacksize
- commitsize - real_guardsize;
if (!VirtualAlloc (real_stacklimit, real_guardsize,
MEM_COMMIT, PAGE_READWRITE | PAGE_GUARD))
goto err;
real_stacklimit += real_guardsize;
if (!VirtualAlloc (real_stacklimit, commitsize, MEM_COMMIT,
PAGE_READWRITE))
goto err;
}
wrapper_arg->stackaddr = (PBYTE) real_stackaddr;
wrapper_arg->stackbase = (PBYTE) real_stackaddr + real_stacksize;
wrapper_arg->stacklimit = real_stacklimit;
wrapper_arg->guardsize = real_guardsize;
}
/* Use the STACK_SIZE_PARAM_IS_A_RESERVATION parameter so only the
minimum size for a thread stack is reserved by the OS. Note that we
reserve a 256K stack, not 64K, otherwise the thread creation might
crash the process due to a stack overflow. */
thread = CreateThread (&sec_none_nih, 4 * PTHREAD_STACK_MIN,
pthread_wrapper, wrapper_arg,
creation_flags | STACK_SIZE_PARAM_IS_A_RESERVATION,
thread_id);
err:
if (!thread && real_stackaddr)
{
/* Don't report the wrong error even though VirtualFree is very unlikely
to fail. */
DWORD err = GetLastError ();
VirtualFree (real_stackaddr, 0, MEM_RELEASE);
SetLastError (err);
}
return thread;
}
#ifdef __x86_64__
// TODO: The equivalent newlib functions only work for SYSV ABI so far.
#undef RtlFillMemory
#undef RtlCopyMemory
extern "C" void NTAPI RtlFillMemory (PVOID, SIZE_T, BYTE);
extern "C" void NTAPI RtlCopyMemory (PVOID, const VOID *, SIZE_T);
extern "C" void *
memset (void *s, int c, size_t n)
{
RtlFillMemory (s, n, c);
return s;
}
extern "C" void *
memcpy(void *__restrict dest, const void *__restrict src, size_t n)
{
RtlCopyMemory (dest, src, n);
return dest;
}
#endif
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