except_arm64ec.c

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/*
 * msvcrt C++ exception handling
 *
 * Copyright 2011 Alexandre Julliard
 * Copyright 2013 André Hentschel
 * Copyright 2017 Martin Storsjo
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#ifdef __arm64ec__
 
#include <setjmp.h>
#include <stdarg.h>
#include <fpieee.h>
 
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#include "msvcrt.h"
#include "excpt.h"
#include "wine/debug.h"
 
#include "cppexcept.h"
 
WINE_DEFAULT_DEBUG_CHANNEL(seh);
 
 
static void * __attribute__((naked,used)) call_handler_arm64( void *func, uintptr_t frame,
                                                                  UINT flags, BYTE *nonvol_regs )
{
    asm( ".seh_proc \"#call_handler_arm64\"\n\t"
         "stp x29, x30, [sp, #-80]!\n\t"
         ".seh_save_fplr_x 80\n\t"
         "stp x19, x20, [sp, #16]\n\t"
         ".seh_save_regp x19, 16\n\t"
         "stp x21, x22, [sp, #32]\n\t"
         ".seh_save_regp x21, 32\n\t"
         "stp x25, x26, [sp, #48]\n\t"
         ".seh_save_regp x25, 48\n\t"
         "str x27, [sp, #64]\n\t"
         ".seh_save_reg x27, 64\n\t"
         "str x1, [sp, #-16]!\n\t"
         ".seh_stackalloc 16\n\t"
         ".seh_endprologue\n\t"
         "ldp x19, x20, [x3, #0]\n\t" /* nonvolatile regs */
         "ldp x21, x22, [x3, #16]\n\t"
         "ldp x25, x26, [x3, #48]\n\t"
         "ldr x27, [x3, #64]\n\t"
         "ldr x29,  [x3, #80]\n\t"
         "blr x0\n\t"
         "add sp, sp, 16\n\t"
         "ldp x19, x20, [sp, #16]\n\t"
         "ldp x21, x22, [sp, #32]\n\t"
         "ldp x25, x26, [sp, #48]\n\t"
         "ldr x27,      [sp, #64]\n\t"
         "ldp x29, x30, [sp], #80\n\t"
         "ret\n\t"
         ".seh_endproc" );
}
 
static void * __attribute__((naked,used)) call_handler_x64( void *func, uintptr_t frame, UINT flags )
{
    asm( ".seh_proc \"#call_handler_x64\"\n\t"
         "stp x29, x30, [sp, #-16]!\n\t"
         ".seh_save_fplr_x 16\n\t"
         ".seh_endprologue\n\t"
         "mov x11, x0\n\t"
         "adr x10, $iexit_thunk$cdecl$i8$i8i8i8\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"
         "ldp x29, x30, [sp], #16\n\t"
         "ret\n\t"
         ".seh_endproc" );
}
 
 
/*******************************************************************
 *      call_catch_handler
 */
void *call_catch_handler( EXCEPTION_RECORD *rec )
{
    ULONG_PTR frame = rec->ExceptionInformation[1];
    void *handler = (void *)rec->ExceptionInformation[5];
 
    TRACE( "calling %p frame %Ix\n", handler, frame );
    if (!RtlIsEcCode( (ULONG_PTR)handler )) return call_handler_x64( handler, frame, 0x100 );
    return call_handler_arm64( handler, frame, 0x100, (BYTE *)rec->ExceptionInformation[10] );
}
 
 
/*******************************************************************
 *      call_unwind_handler
 */
void *call_unwind_handler( void *handler, ULONG_PTR frame, DISPATCHER_CONTEXT *dispatch )
{
    TRACE( "calling %p frame %Ix\n", handler, frame );
    if (!RtlIsEcCode( (ULONG_PTR)handler )) return call_handler_x64( handler, frame, 0x100 );
    return call_handler_arm64( handler, frame, 0x100,
                               ((DISPATCHER_CONTEXT_ARM64EC *)dispatch)->NonVolatileRegisters );
}
 
 
/*******************************************************************
 *      get_exception_pc
 */
ULONG_PTR get_exception_pc( DISPATCHER_CONTEXT *dispatch )
{
    ULONG_PTR pc = dispatch->ControlPc;
    if (RtlIsEcCode( pc ) && ((DISPATCHER_CONTEXT_ARM64EC *)dispatch)->ControlPcIsUnwound) pc -= 4;
    return pc;
}
 
 
/*********************************************************************
 *              handle_fpieee_flt
 */
int handle_fpieee_flt( __msvcrt_ulong exception_code, EXCEPTION_POINTERS *ep,
                       int (__cdecl *handler)(_FPIEEE_RECORD*) )
{
    FIXME("(%lx %p %p)\n", exception_code, ep, handler);
    return EXCEPTION_CONTINUE_SEARCH;
}
 
#if _MSVCR_VER>=110 && _MSVCR_VER<=120
/*********************************************************************
 *  __crtCapturePreviousContext (MSVCR110.@)
 */
void __cdecl __crtCapturePreviousContext( CONTEXT *ctx )
{
    UNWIND_HISTORY_TABLE table;
    RUNTIME_FUNCTION *func;
    PEXCEPTION_ROUTINE handler;
    ULONG_PTR pc, frame, base;
    void *data;
    ULONG i;
 
    RtlCaptureContext( ctx );
    for (i = 0; i < 2; i++)
    {
        pc = ctx->Rip;
        if ((ctx->ContextFlags & CONTEXT_UNWOUND_TO_CALL) && RtlIsEcCode( pc )) pc -= 4;
        if (!(func = RtlLookupFunctionEntry( pc, &base, &table ))) break;
        if (RtlVirtualUnwind2( UNW_FLAG_NHANDLER, base, pc, func, ctx, NULL,
                               &data, &frame, NULL, NULL, NULL, &handler, 0 ))
            break;
        if (!ctx->Rip) break;
        if (!frame) break;
    }
}
#endif
 
#endif  /* __arm64ec__ */