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ntdll: Don't copy xstate from / to syscall frame in usr1_handler().

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Paul Gofman 2024-02-01 12:17:14 -06:00 • committed by Alexandre Julliard
parent ba1e2d5dda
commit efd3d31082
2 changed files with 61 additions and 19 deletions
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46
dlls/ntdll/unix/signal_i386.c
View file

@ -2107,24 +2107,46 @@ static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
*/
static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
struct xcontext xcontext;
ucontext_t *ucontext = sigcontext;
init_handler( sigcontext );
if (is_inside_syscall( sigcontext ))
{
DECLSPEC_ALIGN(64) XSTATE xs;
xcontext.c.ContextFlags = CONTEXT_FULL;
context_init_xstate( &xcontext.c, &xs );
NtGetContextThread( GetCurrentThread(), &xcontext.c );
wait_suspend( &xcontext.c );
NtSetContextThread( GetCurrentThread(), &xcontext.c );
if (is_inside_syscall( ucontext ))
{
struct syscall_frame *frame = x86_thread_data()->syscall_frame;
ULONG64 saved_compaction = 0;
struct xcontext *context;
context = (struct xcontext *)(((ULONG_PTR)ESP_sig(ucontext) - sizeof(*context)) & ~15);
if ((char *)context < (char *)ntdll_get_thread_data()->kernel_stack)
{
ERR_(seh)( "kernel stack overflow.\n" );
return;
}
context->c.ContextFlags = CONTEXT_FULL;
NtGetContextThread( GetCurrentThread(), &context->c );
if (xstate_extended_features())
{
context_init_xstate( &context->c, &frame->xstate );
saved_compaction = frame->xstate.CompactionMask;
}
wait_suspend( &context->c );
if (xstate_extended_features()) frame->xstate.CompactionMask = saved_compaction;
if (context->c.ContextFlags & 0x40)
{
/* xstate is updated directly in frame's xstate */
context->c.ContextFlags &= ~0x40;
frame->restore_flags |= 0x40;
}
NtSetContextThread( GetCurrentThread(), &context->c );
}
else
{
save_context( &xcontext, sigcontext );
wait_suspend( &xcontext.c );
restore_context( &xcontext, sigcontext );
struct xcontext context;
save_context( &context, ucontext );
wait_suspend( &context.c );
restore_context( &context, ucontext );
}
}

34
dlls/ntdll/unix/signal_x86_64.c
View file

@ -2145,20 +2145,40 @@ static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
ucontext_t *ucontext = init_handler( sigcontext );
struct xcontext context;
if (is_inside_syscall( ucontext ))
{
DECLSPEC_ALIGN(64) XSTATE xs;
context.c.ContextFlags = CONTEXT_FULL | CONTEXT_SEGMENTS;
context_init_xstate( &context.c, &xs );
struct syscall_frame *frame = amd64_thread_data()->syscall_frame;
ULONG64 saved_compaction = 0;
struct xcontext *context;
NtGetContextThread( GetCurrentThread(), &context.c );
wait_suspend( &context.c );
NtSetContextThread( GetCurrentThread(), &context.c );
context = (struct xcontext *)(((ULONG_PTR)RSP_sig(ucontext) - sizeof(*context)) & ~15);
if ((char *)context < (char *)ntdll_get_thread_data()->kernel_stack)
{
ERR_(seh)( "kernel stack overflow.\n" );
return;
}
context->c.ContextFlags = CONTEXT_FULL | CONTEXT_SEGMENTS;
NtGetContextThread( GetCurrentThread(), &context->c );
if (xstate_extended_features())
{
context_init_xstate( &context->c, &frame->xstate );
saved_compaction = frame->xstate.CompactionMask;
}
wait_suspend( &context->c );
if (xstate_extended_features()) frame->xstate.CompactionMask = saved_compaction;
if (context->c.ContextFlags & 0x40)
{
/* xstate is updated directly in frame's xstate */
context->c.ContextFlags &= ~0x40;
frame->restore_flags |= 0x40;
}
NtSetContextThread( GetCurrentThread(), &context->c );
}
else
{
struct xcontext context;
save_context( &context, ucontext );
wait_suspend( &context.c );
restore_context( &context, ucontext );