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ntdll: Clear the thread stack by hand instead of remapping zero pages. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2020-08-27 11:58:26 +02:00
parent 75e616d52b
commit 3863b243fe
5 changed files with 25 additions and 33 deletions
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3
dlls/ntdll/signal_arm.c
View File

@ -268,10 +268,7 @@ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer,
*/
__ASM_GLOBAL_FUNC( signal_start_thread,
"mov sp, r0\n\t" /* context */
"and r0, #~0xff0\n\t" /* round down to page size */
"bl " __ASM_NAME("virtual_clear_thread_stack") "\n\t"
"mov r1, #1\n\t"
"mov r0, sp\n\t"
"b " __ASM_NAME("NtContinue") )
/**********************************************************************

3
dlls/ntdll/signal_arm64.c
View File

@ -1222,9 +1222,6 @@ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer,
*/
__ASM_GLOBAL_FUNC( signal_start_thread,
"mov sp, x0\n\t" /* context */
"and x0, x0, #~0xfff\n\t" /* round down to page size */
"bl " __ASM_NAME("virtual_clear_thread_stack") "\n\t"
"mov x0, sp\n\t"
"mov x1, #1\n\t"
"b " __ASM_NAME("NtContinue") )

17
dlls/ntdll/signal_i386.c
View File

@ -475,13 +475,18 @@ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer,
*/
__ASM_GLOBAL_FUNC( signal_start_thread,
"movl 4(%esp),%esi\n\t" /* context */
"leal -12(%esi),%eax\n\t"
"movl %eax,%esp\n\t"
/* clear the stack */
"andl $~0xfff,%eax\n\t" /* round down to page size */
"movl %eax,(%esp)\n\t"
"call " __ASM_NAME("virtual_clear_thread_stack") "\n\t"
"leal -12(%esi),%ecx\n\t"
/* clear the thread stack */
"andl $~0xfff,%ecx\n\t" /* round down to page size */
"movl %fs:8,%edi\n\t" /* NtCurrentTeb()->Tib.StackLimit */
"addl $0x1000,%edi\n\t"
"movl %edi,%esp\n\t"
"subl %edi,%ecx\n\t"
"xorl %eax,%eax\n\t"
"shrl $2,%ecx\n\t"
"rep; stosl\n\t"
/* switch to the initial context */
"leal -12(%esi),%esp\n\t"
"movl $1,4(%esp)\n\t"
"movl %esi,(%esp)\n\t"
"call " __ASM_STDCALL("NtContinue", 8) )

16
dlls/ntdll/signal_x86_64.c
View File

@ -1487,12 +1487,20 @@ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer,
*/
__ASM_GLOBAL_FUNC( signal_start_thread,
"movq %rcx,%rbx\n\t" /* context */
"leaq -32(%rcx),%rcx\n\t"
"movq %rcx,%rsp\n\t"
/* clear the thread stack */
"andq $~0xfff,%rcx\n\t" /* round down to page size */
"call " __ASM_NAME("virtual_clear_thread_stack") "\n\t"
"movl $1,%edx\n\t"
"movq %gs:0x30,%rax\n\t"
"movq 0x10(%rax),%rdi\n\t" /* NtCurrentTeb()->Tib.StackLimit */
"addq $0x2000,%rdi\n\t"
"movq %rdi,%rsp\n\t"
"subq %rdi,%rcx\n\t"
"xorl %eax,%eax\n\t"
"shrq $3,%rcx\n\t"
"rep; stosq\n\t"
/* switch to the initial context */
"leaq -32(%rbx),%rsp\n\t"
"movq %rbx,%rcx\n\t"
"movl $1,%edx\n\t"
"call " __ASM_NAME("NtContinue") )

15
dlls/ntdll/virtual.c
View File

@ -105,18 +105,3 @@ void WINAPI RtlFreeUserStack( void *stack )
NtFreeVirtualMemory( NtCurrentProcess(), &stack, &size, MEM_RELEASE );
}
/***********************************************************************
* virtual_clear_thread_stack
*
* Clear the stack contents before calling the main entry point, some broken apps need that.
*/
void CDECL virtual_clear_thread_stack( void *stack_end )
{
void *stack = NtCurrentTeb()->Tib.StackLimit;
SIZE_T size = (char *)stack_end - (char *)stack;
NtFreeVirtualMemory( GetCurrentProcess(), &stack, &size, MEM_DECOMMIT );
NtAllocateVirtualMemory( GetCurrentProcess(), &stack, 0, &size, MEM_COMMIT, PAGE_READWRITE );
}