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ntdll: Implement RtlRestoreContext on ARM64EC.

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Alexandre Julliard 2024-03-11 12:16:10 +01:00
parent 2ab736e292
commit 6d8b4e661f
1 changed files with 84 additions and 1 deletions
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85
dlls/ntdll/signal_arm64ec.c
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@ -1893,12 +1893,95 @@ int __attribute__((naked)) NTDLL__setjmpex( _JUMP_BUFFER *buf, void *frame )
}
/**********************************************************************
* call_consolidate_callback
*
* Wrapper function to call a consolidate callback from a fake frame.
* If the callback executes RtlUnwindEx (like for example done in C++ handlers),
* we have to skip all frames which were already processed. To do that we
* trick the unwinding functions into thinking the call came from somewhere
* else.
*/
static void __attribute__((naked,noreturn)) consolidate_callback( CONTEXT *context,
void *(CALLBACK *callback)(EXCEPTION_RECORD *),
EXCEPTION_RECORD *rec )
{
asm( ".seh_proc consolidate_callback\n\t"
"stp x29, x30, [sp, #-16]!\n\t"
".seh_save_fplr_x 16\n\t"
"sub sp, sp, #0x4d0\n\t"
".seh_stackalloc 0x4d0\n\t"
".seh_endprologue\n\t"
"mov x4, sp\n\t"
/* copy the context onto the stack */
"mov x5, #0x4d0/16\n" /* sizeof(CONTEXT) */
"1:\tldp x6, x7, [x0], #16\n\t"
"stp x6, x7, [x4], #16\n\t"
"subs x5, x5, #1\n\t"
"b.ne 1b\n\t"
"mov x0, x2\n\t" /* rec */
"b invoke_callback\n\t"
".seh_endproc\n\t"
".seh_proc invoke_callback\n"
"invoke_callback:\n\t"
".seh_ec_context\n\t"
".seh_endprologue\n\t"
"mov x11, x1\n\t" /* callback */
"adr x10, $iexit_thunk$cdecl$i8$i8\n\t"
"adrp x16, __os_arm64x_dispatch_icall\n\t"
"ldr x16, [x16, #:lo12:__os_arm64x_dispatch_icall]\n\t"
"blr x16\n\t"
"blr x11\n\t"
"str x0, [sp, #0xf8]\n\t" /* context->Rip */
"mov x0, sp\n\t" /* context */
"mov w1, #0\n\t"
"bl \"#NtContinue\"\n\t"
".seh_endproc" );
}
/*******************************************************************
* RtlRestoreContext (NTDLL.@)
*/
void CDECL RtlRestoreContext( CONTEXT *context, EXCEPTION_RECORD *rec )
{
FIXME( "not implemented\n" );
EXCEPTION_REGISTRATION_RECORD *teb_frame = NtCurrentTeb()->Tib.ExceptionList;
if (rec && rec->ExceptionCode == STATUS_LONGJUMP && rec->NumberParameters >= 1)
{
struct _JUMP_BUFFER *jmp = (struct _JUMP_BUFFER *)rec->ExceptionInformation[0];
context->Rbx = jmp->Rbx;
context->Rsp = jmp->Rsp;
context->Rbp = jmp->Rbp;
context->Rsi = jmp->Rsi;
context->Rdi = jmp->Rdi;
context->R12 = jmp->R12;
context->R13 = jmp->R13;
context->R14 = jmp->R14;
context->R15 = jmp->R15;
context->Rip = jmp->Rip;
context->MxCsr = jmp->MxCsr;
context->FltSave.MxCsr = jmp->MxCsr;
context->FltSave.ControlWord = jmp->FpCsr;
memcpy( &context->Xmm6, &jmp->Xmm6, 10 * sizeof(M128A) );
}
else if (rec && rec->ExceptionCode == STATUS_UNWIND_CONSOLIDATE && rec->NumberParameters >= 1)
{
void * (CALLBACK *consolidate)(EXCEPTION_RECORD *) = (void *)rec->ExceptionInformation[0];
TRACE( "calling consolidate callback %p (rec=%p)\n", consolidate, rec );
consolidate_callback( context, consolidate, rec );
}
/* hack: remove no longer accessible TEB frames */
while ((ULONG64)teb_frame < context->Rsp)
{
TRACE( "removing TEB frame: %p\n", teb_frame );
teb_frame = __wine_pop_frame( teb_frame );
}
TRACE( "returning to %p stack %p\n", (void *)context->Rip, (void *)context->Rsp );
NtContinue( context, FALSE );
}