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newlib/winsup/cygwin/wincap.cc
Corinna Vinschen e753e4129a Always allocate main thread stack from pthread stack area on x86_64. 
* dcrt0.cc: Semi-revert commit 12743c2d5d.
        (dll_crt0_0): Drop setting wow64_needs_stack_adjustment on 64 bit.
        (_dll_crt0): Split out 64 bit code again and always create new main
        thread stack, unless forked off from the non main thread in the parent.
        Call create_new_main_thread_stack with parent stack commitsize if
        started from the parent's main thread.
        Only call child_info_fork::alloc_stack for the latter case on 64 bit.
        Slightly rearrange moving rsp and rbp to new stack and document how.
        Revert 32 bit wow64 handling to its former self.
        * miscfunc.cc (create_new_main_thread_stack): Take a commitsize
        parameter and use it if it's not 0.  Don't set _main_tls here, it's
        done in the caller _dll_crt0 anyway.  Return stackbase - 16 bytes,
        rather than stacklimit (which was very wrong anyway).
        * miscfuncs.h (create_new_main_thread_stack): Accommodate declaration
        to aforementioned change.
        * wincap.h (wincaps::has_3264_stack_broken): Remove element.
        * wincap.cc: Ditto, throughout.
        * wow64.cc: Semi-revert to pre-12743c2d5d2721f3a80b4d7671a349be03c1f520
        but keep architecture-agnostic type changes intact.  Fix formatting.
        * wow64.h: Revert to pre-12743c2d5d2721f3a80b4d7671a349be03c1f520.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2015-12-07 16:10:55 +01:00

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/* wincap.cc -- figure out on which OS we're running. Set the
capability class to the appropriate values.
Copyright 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 "security.h"
#include "ntdll.h"
/* CV, 2008-10-23: All wincapc's have to be in the .cygwin_dll_common section,
same as wincap itself. Otherwise the capability changes made in
wincapc::init() are not propagated to any subsequently started process
in the same session. I'm only writing this longish comment because I'm
puzzled that this has never been noticed before... */
wincaps wincap_xpsp2 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:1,
max_sys_priv:SE_CREATE_GLOBAL_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:false,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:false,
has_gaa_on_link_prefix:false,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:false,
has_restricted_stack_args:false,
has_transactions:false,
has_sendmsg:false,
has_broken_udf:true,
has_broken_alloc_console:false,
has_always_all_codepages:false,
has_localenames:false,
has_fast_cwd:false,
has_restricted_raw_disk_access:false,
use_dont_resolve_hack:true,
has_console_logon_sid:false,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:false,
has_pipe_reject_remote_clients:false,
terminate_thread_frees_stack:false,
has_precise_system_time:false,
has_microsoft_accounts:false,
has_set_thread_stack_guarantee:false,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:false,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
};
wincaps wincap_2003 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:1,
max_sys_priv:SE_CREATE_GLOBAL_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:false,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:false,
has_gaa_on_link_prefix:false,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:false,
has_restricted_stack_args:true,
has_transactions:false,
has_sendmsg:false,
has_broken_udf:true,
has_broken_alloc_console:false,
has_always_all_codepages:false,
has_localenames:false,
has_fast_cwd:false,
has_restricted_raw_disk_access:false,
use_dont_resolve_hack:true,
has_console_logon_sid:false,
wow64_has_secondary_stack:true,
has_program_compatibility_assistant:false,
has_pipe_reject_remote_clients:false,
terminate_thread_frees_stack:false,
has_precise_system_time:false,
has_microsoft_accounts:false,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:true,
has_processor_groups:false,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
};
wincaps wincap_vista __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:1,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:true,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:true,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:false,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:false,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:false,
has_microsoft_accounts:false,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:false,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
};
wincaps wincap_7 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:1,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:true,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:true,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:true,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:false,
has_microsoft_accounts:false,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:true,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
};
wincaps wincap_8 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:2,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:true,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:true,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:true,
has_microsoft_accounts:true,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:true,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
};
wincaps wincap_10 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:2,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:true,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:true,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:true,
has_microsoft_accounts:true,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:true,
has_broken_prefetchvm:true,
has_new_pebteb_region:false,
};
wincaps wincap_10_1511 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:2,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:true,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:true,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:true,
has_microsoft_accounts:true,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:true,
has_broken_prefetchvm:false,
has_new_pebteb_region:true,
};
wincapc wincap __attribute__((section (".cygwin_dll_common"), shared));
void
wincapc::init ()
{
if (caps)
return; // already initialized
GetSystemInfo (&system_info);
version.dwOSVersionInfoSize = sizeof (RTL_OSVERSIONINFOEXW);
RtlGetVersion (&version);
switch (version.dwMajorVersion)
{
case 5:
switch (version.dwMinorVersion)
{
case 1:
caps = &wincap_xpsp2;
break;
default:
caps = &wincap_2003;
}
break;
case 6:
switch (version.dwMinorVersion)
{
case 0:
caps = &wincap_vista;
break;
case 1:
caps = &wincap_7;
break;
case 2:
case 3:
caps = &wincap_8;
break;
default:
caps = &wincap_10;
break;
}
break;
case 10:
default:
if (version.dwBuildNumber >= 10586)
caps = &wincap_10_1511;
else
caps = &wincap_10;
break;
}
((wincaps *)caps)->is_server = (version.wProductType != VER_NT_WORKSTATION);
#ifdef __x86_64__
wow64 = 0;
/* 64 bit systems have one more guard page than their 32 bit counterpart. */
++((wincaps *)caps)->def_guard_pages;
#else
/* RtlQueryProcessDebugInformation/CreateToolhelp32Snapshot both crash the
target process on 64 bit XP/2003 in native 64 bit mode only. Reset the
flag here for 32 bit. */
((wincaps *)caps)->has_broken_rtl_query_process_debug_information = false;
/* Windows 10 1511 has a stack move when a 64 bit process is started from
a 32 bit process, just as it was vice versa in XP/2003. Reset the flag
here for 32 bit. */
if (NT_SUCCESS (NtQueryInformationProcess (NtCurrentProcess (),
ProcessWow64Information,
&wow64, sizeof wow64, NULL))
&& !wow64)
#endif
{
((wincaps *)caps)->needs_count_in_si_lpres2 = false;
((wincaps *)caps)->has_restricted_stack_args = false;
((wincaps *)caps)->wow64_has_secondary_stack = false;
((wincaps *)caps)->has_gaa_largeaddress_bug = false;
((wincaps *)caps)->has_broken_prefetchvm = false;
}
__small_sprintf (osnam, "NT-%d.%d", version.dwMajorVersion,
version.dwMinorVersion);
}
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