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wine/dlls/msvcrt/except_i386.c

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/*
* msvcrt C++ exception handling
*
* Copyright 2000 Jon Griffiths
* Copyright 2002 Alexandre Julliard
* Copyright 2005 Juan Lang
*
* 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
*
* NOTES
* A good reference is the article "How a C++ compiler implements
* exception handling" by Vishal Kochhar, available on
* www.thecodeproject.com.
*/
#include "config.h"
#include "wine/port.h"
#ifdef __i386__
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#include "msvcrt.h"
#include "wine/exception.h"
#include "excpt.h"
#include "wine/debug.h"
#include "cppexcept.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
/* the exception frame used by CxxFrameHandler */
typedef struct __cxx_exception_frame
{
EXCEPTION_REGISTRATION_RECORD frame; /* the standard exception frame */
int trylevel;
DWORD ebp;
} cxx_exception_frame;
/* info about a single catch {} block */
typedef struct __catchblock_info
{
UINT flags; /* flags (see below) */
const type_info *type_info; /* C++ type caught by this block */
int offset; /* stack offset to copy exception object to */
void (*handler)(void);/* catch block handler code */
} catchblock_info;
#define TYPE_FLAG_CONST 1
#define TYPE_FLAG_VOLATILE 2
#define TYPE_FLAG_REFERENCE 8
/* info about a single try {} block */
typedef struct __tryblock_info
{
int start_level; /* start trylevel of that block */
int end_level; /* end trylevel of that block */
int catch_level; /* initial trylevel of the catch block */
int catchblock_count; /* count of catch blocks in array */
const catchblock_info *catchblock; /* array of catch blocks */
} tryblock_info;
/* info about the unwind handler for a given trylevel */
typedef struct __unwind_info
{
int prev; /* prev trylevel unwind handler, to run after this one */
void (*handler)(void);/* unwind handler */
} unwind_info;
/* descriptor of all try blocks of a given function */
typedef struct __cxx_function_descr
{
UINT magic; /* must be CXX_FRAME_MAGIC */
UINT unwind_count; /* number of unwind handlers */
const unwind_info *unwind_table; /* array of unwind handlers */
UINT tryblock_count; /* number of try blocks */
const tryblock_info *tryblock; /* array of try blocks */
UINT ipmap_count;
const void *ipmap;
const void *expect_list; /* expected exceptions list when magic >= VC7 */
UINT flags; /* flags when magic >= VC8 */
} cxx_function_descr;
#define FUNC_DESCR_SYNCHRONOUS 1 /* synchronous exceptions only (built with /EHs) */
typedef struct _SCOPETABLE
{
int previousTryLevel;
int (*lpfnFilter)(PEXCEPTION_POINTERS);
int (*lpfnHandler)(void);
} SCOPETABLE, *PSCOPETABLE;
typedef struct _MSVCRT_EXCEPTION_FRAME
{
EXCEPTION_REGISTRATION_RECORD *prev;
void (*handler)(PEXCEPTION_RECORD, EXCEPTION_REGISTRATION_RECORD*,
PCONTEXT, PEXCEPTION_RECORD);
PSCOPETABLE scopetable;
int trylevel;
int _ebp;
PEXCEPTION_POINTERS xpointers;
} MSVCRT_EXCEPTION_FRAME;
typedef struct
{
int gs_cookie_offset;
ULONG gs_cookie_xor;
int eh_cookie_offset;
ULONG eh_cookie_xor;
SCOPETABLE entries[1];
} SCOPETABLE_V4;
#define TRYLEVEL_END (-1) /* End of trylevel list */
DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
const cxx_function_descr *descr,
EXCEPTION_REGISTRATION_RECORD* nested_frame, int nested_trylevel );
/* call a function with a given ebp */
static inline void *call_ebp_func( void *func, void *ebp )
{
void *ret;
int dummy;
__asm__ __volatile__ ("pushl %%ebx\n\t"
"pushl %%ebp\n\t"
"movl %4,%%ebp\n\t"
"call *%%eax\n\t"
"popl %%ebp\n\t"
"popl %%ebx"
: "=a" (ret), "=S" (dummy), "=D" (dummy)
: "0" (func), "1" (ebp) : "ecx", "edx", "memory" );
return ret;
}
/* call a copy constructor */
static inline void call_copy_ctor( void *func, void *this, void *src, int has_vbase )
{
TRACE( "calling copy ctor %p object %p src %p\n", func, this, src );
if (has_vbase)
/* in that case copy ctor takes an extra bool indicating whether to copy the base class */
__asm__ __volatile__("pushl $1; pushl %2; call *%0"
: : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" );
else
__asm__ __volatile__("pushl %2; call *%0"
: : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" );
}
/* call the destructor of the exception object */
static inline void call_dtor( void *func, void *object )
{
__asm__ __volatile__("call *%0" : : "r" (func), "c" (object) : "eax", "edx", "memory" );
}
/* continue execution to the specified address after exception is caught */
static inline void DECLSPEC_NORETURN continue_after_catch( cxx_exception_frame* frame, void *addr )
{
__asm__ __volatile__("movl -4(%0),%%esp; leal 12(%0),%%ebp; jmp *%1"
: : "r" (frame), "a" (addr) );
for (;;) ; /* unreached */
}
static inline void call_finally_block( void *code_block, void *base_ptr )
{
__asm__ __volatile__ ("movl %1,%%ebp; call *%%eax"
: : "a" (code_block), "g" (base_ptr));
}
static inline int call_filter( int (*func)(PEXCEPTION_POINTERS), void *arg, void *ebp )
{
int ret;
__asm__ __volatile__ ("pushl %%ebp; pushl %3; movl %2,%%ebp; call *%%eax; popl %%ebp; popl %%ebp"
: "=a" (ret)
: "0" (func), "r" (ebp), "r" (arg)
: "ecx", "edx", "memory" );
return ret;
}
static inline int call_unwind_func( int (*func)(void), void *ebp )
{
int ret;
__asm__ __volatile__ ("pushl %%ebp\n\t"
"pushl %%ebx\n\t"
"pushl %%esi\n\t"
"pushl %%edi\n\t"
"movl %2,%%ebp\n\t"
"call *%0\n\t"
"popl %%edi\n\t"
"popl %%esi\n\t"
"popl %%ebx\n\t"
"popl %%ebp"
: "=a" (ret)
: "0" (func), "r" (ebp)
: "ecx", "edx", "memory" );
return ret;
}
static inline void dump_type( const cxx_type_info *type )
{
TRACE( "flags %x type %p %s offsets %d,%d,%d size %d copy ctor %p\n",
type->flags, type->type_info, dbgstr_type_info(type->type_info),
type->offsets.this_offset, type->offsets.vbase_descr, type->offsets.vbase_offset,
type->size, type->copy_ctor );
}
static void dump_exception_type( const cxx_exception_type *type )
{
UINT i;
TRACE( "flags %x destr %p handler %p type info %p\n",
type->flags, type->destructor, type->custom_handler, type->type_info_table );
for (i = 0; i < type->type_info_table->count; i++)
{
TRACE( " %d: ", i );
dump_type( type->type_info_table->info[i] );
}
}
static void dump_function_descr( const cxx_function_descr *descr )
{
UINT i;
int j;
TRACE( "magic %x\n", descr->magic );
TRACE( "unwind table: %p %d\n", descr->unwind_table, descr->unwind_count );
for (i = 0; i < descr->unwind_count; i++)
{
TRACE( " %d: prev %d func %p\n", i,
descr->unwind_table[i].prev, descr->unwind_table[i].handler );
}
TRACE( "try table: %p %d\n", descr->tryblock, descr->tryblock_count );
for (i = 0; i < descr->tryblock_count; i++)
{
TRACE( " %d: start %d end %d catchlevel %d catch %p %d\n", i,
descr->tryblock[i].start_level, descr->tryblock[i].end_level,
descr->tryblock[i].catch_level, descr->tryblock[i].catchblock,
descr->tryblock[i].catchblock_count );
for (j = 0; j < descr->tryblock[i].catchblock_count; j++)
{
const catchblock_info *ptr = &descr->tryblock[i].catchblock[j];
TRACE( " %d: flags %x offset %d handler %p type %p %s\n",
j, ptr->flags, ptr->offset, ptr->handler,
ptr->type_info, dbgstr_type_info( ptr->type_info ) );
}
}
if (descr->magic <= CXX_FRAME_MAGIC_VC6) return;
TRACE( "expect list: %p\n", descr->expect_list );
if (descr->magic <= CXX_FRAME_MAGIC_VC7) return;
TRACE( "flags: %08x\n", descr->flags );
}
/* check if the exception type is caught by a given catch block, and return the type that matched */
static const cxx_type_info *find_caught_type( cxx_exception_type *exc_type,
const catchblock_info *catchblock )
{
UINT i;
for (i = 0; i < exc_type->type_info_table->count; i++)
{
const cxx_type_info *type = exc_type->type_info_table->info[i];
if (!catchblock->type_info) return type; /* catch(...) matches any type */
if (catchblock->type_info != type->type_info)
{
if (strcmp( catchblock->type_info->mangled, type->type_info->mangled )) continue;
}
/* type is the same, now check the flags */
if ((exc_type->flags & TYPE_FLAG_CONST) &&
!(catchblock->flags & TYPE_FLAG_CONST)) continue;
if ((exc_type->flags & TYPE_FLAG_VOLATILE) &&
!(catchblock->flags & TYPE_FLAG_VOLATILE)) continue;
return type; /* it matched */
}
return NULL;
}
/* copy the exception object where the catch block wants it */
static void copy_exception( void *object, cxx_exception_frame *frame,
const catchblock_info *catchblock, const cxx_type_info *type )
{
void **dest_ptr;
if (!catchblock->type_info || !catchblock->type_info->mangled[0]) return;
if (!catchblock->offset) return;
dest_ptr = (void **)((char *)&frame->ebp + catchblock->offset);
if (catchblock->flags & TYPE_FLAG_REFERENCE)
{
*dest_ptr = get_this_pointer( &type->offsets, object );
}
else if (type->flags & CLASS_IS_SIMPLE_TYPE)
{
memmove( dest_ptr, object, type->size );
/* if it is a pointer, adjust it */
if (type->size == sizeof(void *)) *dest_ptr = get_this_pointer( &type->offsets, *dest_ptr );
}
else /* copy the object */
{
if (type->copy_ctor)
call_copy_ctor( type->copy_ctor, dest_ptr, get_this_pointer(&type->offsets,object),
(type->flags & CLASS_HAS_VIRTUAL_BASE_CLASS) );
else
memmove( dest_ptr, get_this_pointer(&type->offsets,object), type->size );
}
}
/* unwind the local function up to a given trylevel */
static void cxx_local_unwind( cxx_exception_frame* frame, const cxx_function_descr *descr, int last_level)
{
void (*handler)(void);
int trylevel = frame->trylevel;
while (trylevel != last_level)
{
if (trylevel < 0 || trylevel >= descr->unwind_count)
{
ERR( "invalid trylevel %d\n", trylevel );
MSVCRT_terminate();
}
handler = descr->unwind_table[trylevel].handler;
if (handler)
{
TRACE( "calling unwind handler %p trylevel %d last %d ebp %p\n",
handler, trylevel, last_level, &frame->ebp );
call_ebp_func( handler, &frame->ebp );
}
trylevel = descr->unwind_table[trylevel].prev;
}
frame->trylevel = last_level;
}
/* exception frame for nested exceptions in catch block */
struct catch_func_nested_frame
{
EXCEPTION_REGISTRATION_RECORD frame; /* standard exception frame */
EXCEPTION_RECORD *prev_rec; /* previous record to restore in thread data */
cxx_exception_frame *cxx_frame; /* frame of parent exception */
const cxx_function_descr *descr; /* descriptor of parent exception */
int trylevel; /* current try level */
EXCEPTION_RECORD *rec; /* rec associated with frame */
};
/* handler for exceptions happening while calling a catch function */
static DWORD catch_function_nested_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
struct catch_func_nested_frame *nested_frame = (struct catch_func_nested_frame *)frame;
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
msvcrt_get_thread_data()->exc_record = nested_frame->prev_rec;
return ExceptionContinueSearch;
}
TRACE( "got nested exception in catch function\n" );
if(rec->ExceptionCode == CXX_EXCEPTION)
{
PEXCEPTION_RECORD prev_rec = nested_frame->rec;
if((rec->ExceptionInformation[1] == 0 && rec->ExceptionInformation[2] == 0) ||
(rec->ExceptionInformation[1] == prev_rec->ExceptionInformation[1] &&
rec->ExceptionInformation[2] == prev_rec->ExceptionInformation[2]))
{
/* exception was rethrown */
rec->ExceptionInformation[1] = prev_rec->ExceptionInformation[1];
rec->ExceptionInformation[2] = prev_rec->ExceptionInformation[2];
TRACE("detect rethrow: re-propagate: obj: %lx, type: %lx\n",
rec->ExceptionInformation[1], rec->ExceptionInformation[2]);
}
else if (nested_frame->prev_rec &&
nested_frame->prev_rec->ExceptionInformation[1] == prev_rec->ExceptionInformation[1] &&
nested_frame->prev_rec->ExceptionInformation[2] == prev_rec->ExceptionInformation[2])
{
TRACE("detect threw new exception in catch block - not owning old(obj: %lx type: %lx)\n",
prev_rec->ExceptionInformation[1], prev_rec->ExceptionInformation[2]);
}
else {
/* new exception in exception handler, destroy old */
void *object = (void*)prev_rec->ExceptionInformation[1];
cxx_exception_type *info = (cxx_exception_type*) prev_rec->ExceptionInformation[2];
TRACE("detect threw new exception in catch block - destroy old(obj: %p type: %p)\n",
object, info);
if(info && info->destructor)
call_dtor( info->destructor, object );
}
}
return cxx_frame_handler( rec, nested_frame->cxx_frame, context,
NULL, nested_frame->descr, &nested_frame->frame,
nested_frame->trylevel );
}
/* find and call the appropriate catch block for an exception */
/* returns the address to continue execution to after the catch block was called */
static inline void call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame,
const cxx_function_descr *descr, int nested_trylevel,
cxx_exception_type *info )
{
UINT i;
int j;
void *addr, *object = (void *)rec->ExceptionInformation[1];
struct catch_func_nested_frame nested_frame;
int trylevel = frame->trylevel;
thread_data_t *thread_data = msvcrt_get_thread_data();
DWORD save_esp = ((DWORD*)frame)[-1];
for (i = 0; i < descr->tryblock_count; i++)
{
const tryblock_info *tryblock = &descr->tryblock[i];
if (trylevel < tryblock->start_level) continue;
if (trylevel > tryblock->end_level) continue;
/* got a try block */
for (j = 0; j < tryblock->catchblock_count; j++)
{
const catchblock_info *catchblock = &tryblock->catchblock[j];
if(info)
{
const cxx_type_info *type = find_caught_type( info, catchblock );
if (!type) continue;
TRACE( "matched type %p in tryblock %d catchblock %d\n", type, i, j );
/* copy the exception to its destination on the stack */
copy_exception( object, frame, catchblock, type );
}
else
{
/* no CXX_EXCEPTION only proceed with a catch(...) block*/
if(catchblock->type_info)
continue;
TRACE("found catch(...) block\n");
}
/* unwind the stack */
RtlUnwind( frame, 0, rec, 0 );
cxx_local_unwind( frame, descr, tryblock->start_level );
frame->trylevel = tryblock->end_level + 1;
/* call the catch block */
TRACE( "calling catch block %p addr %p ebp %p\n",
catchblock, catchblock->handler, &frame->ebp );
/* setup an exception block for nested exceptions */
nested_frame.frame.Handler = catch_function_nested_handler;
nested_frame.prev_rec = thread_data->exc_record;
nested_frame.cxx_frame = frame;
nested_frame.descr = descr;
nested_frame.trylevel = nested_trylevel + 1;
nested_frame.rec = rec;
__wine_push_frame( &nested_frame.frame );
thread_data->exc_record = rec;
addr = call_ebp_func( catchblock->handler, &frame->ebp );
thread_data->exc_record = nested_frame.prev_rec;
__wine_pop_frame( &nested_frame.frame );
((DWORD*)frame)[-1] = save_esp;
if (info && info->destructor) call_dtor( info->destructor, object );
TRACE( "done, continuing at %p\n", addr );
continue_after_catch( frame, addr );
}
}
}
/*********************************************************************
* cxx_frame_handler
*
* Implementation of __CxxFrameHandler.
*/
DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
const cxx_function_descr *descr,
EXCEPTION_REGISTRATION_RECORD* nested_frame,
int nested_trylevel )
{
cxx_exception_type *exc_type;
if (descr->magic < CXX_FRAME_MAGIC_VC6 || descr->magic > CXX_FRAME_MAGIC_VC8)
{
ERR( "invalid frame magic %x\n", descr->magic );
return ExceptionContinueSearch;
}
if (descr->magic >= CXX_FRAME_MAGIC_VC8 &&
(descr->flags & FUNC_DESCR_SYNCHRONOUS) &&
(rec->ExceptionCode != CXX_EXCEPTION))
return ExceptionContinueSearch; /* handle only c++ exceptions */
if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND))
{
if (descr->unwind_count && !nested_trylevel) cxx_local_unwind( frame, descr, -1 );
return ExceptionContinueSearch;
}
if (!descr->tryblock_count) return ExceptionContinueSearch;
if(rec->ExceptionCode == CXX_EXCEPTION)
{
if (rec->ExceptionInformation[1] == 0 && rec->ExceptionInformation[2] == 0)
{
EXCEPTION_RECORD *exc_record = msvcrt_get_thread_data()->exc_record;
rec->ExceptionInformation[1] = exc_record->ExceptionInformation[1];
rec->ExceptionInformation[2] = exc_record->ExceptionInformation[2];
TRACE("detect rethrow: obj: %lx, type: %lx\n",
rec->ExceptionInformation[1], rec->ExceptionInformation[2]);
}
exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
if (rec->ExceptionInformation[0] > CXX_FRAME_MAGIC_VC8 &&
exc_type->custom_handler)
{
return exc_type->custom_handler( rec, frame, context, dispatch,
descr, nested_trylevel, nested_frame, 0 );
}
if (TRACE_ON(seh))
{
TRACE("handling C++ exception rec %p frame %p trylevel %d descr %p nested_frame %p\n",
rec, frame, frame->trylevel, descr, nested_frame );
dump_exception_type( exc_type );
dump_function_descr( descr );
}
}
else
{
exc_type = NULL;
TRACE("handling C exception code %x rec %p frame %p trylevel %d descr %p nested_frame %p\n",
rec->ExceptionCode, rec, frame, frame->trylevel, descr, nested_frame );
}
call_catch_block( rec, frame, descr, frame->trylevel, exc_type );
return ExceptionContinueSearch;
}
/*********************************************************************
* __CxxFrameHandler (MSVCRT.@)
*/
extern DWORD CDECL __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame,
PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch );
__ASM_GLOBAL_FUNC( __CxxFrameHandler,
"pushl $0\n\t" /* nested_trylevel */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl $0\n\t" /* nested_frame */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl %eax\n\t" /* descr */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 28(%esp)\n\t" /* dispatch */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 28(%esp)\n\t" /* context */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 28(%esp)\n\t" /* frame */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 28(%esp)\n\t" /* rec */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"call " __ASM_NAME("cxx_frame_handler") "\n\t"
"add $28,%esp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset -28\n\t")
"ret" )
/*********************************************************************
* __CxxLongjmpUnwind (MSVCRT.@)
*
* Callback meant to be used as UnwindFunc for setjmp/longjmp.
*/
void __stdcall __CxxLongjmpUnwind( const struct MSVCRT___JUMP_BUFFER *buf )
{
cxx_exception_frame *frame = (cxx_exception_frame *)buf->Registration;
const cxx_function_descr *descr = (const cxx_function_descr *)buf->UnwindData[0];
TRACE( "unwinding frame %p descr %p trylevel %ld\n", frame, descr, buf->TryLevel );
cxx_local_unwind( frame, descr, buf->TryLevel );
}
/*********************************************************************
* __CppXcptFilter (MSVCRT.@)
*/
int CDECL __CppXcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
{
/* only filter c++ exceptions */
if (ex != CXX_EXCEPTION) return EXCEPTION_CONTINUE_SEARCH;
return _XcptFilter( ex, ptr );
}
/*********************************************************************
* __CxxDetectRethrow (MSVCRT.@)
*/
BOOL CDECL __CxxDetectRethrow(PEXCEPTION_POINTERS ptrs)
{
PEXCEPTION_RECORD rec;
if (!ptrs)
return FALSE;
rec = ptrs->ExceptionRecord;
if (rec->ExceptionCode == CXX_EXCEPTION &&
rec->NumberParameters == 3 &&
rec->ExceptionInformation[0] == CXX_FRAME_MAGIC_VC6 &&
rec->ExceptionInformation[2])
{
ptrs->ExceptionRecord = msvcrt_get_thread_data()->exc_record;
return TRUE;
}
return (msvcrt_get_thread_data()->exc_record == rec);
}
/*********************************************************************
* __CxxQueryExceptionSize (MSVCRT.@)
*/
unsigned int CDECL __CxxQueryExceptionSize(void)
{
return sizeof(cxx_exception_type);
}
/*********************************************************************
* _EH_prolog (MSVCRT.@)
*/
/* Provided for VC++ binary compatibility only */
__ASM_GLOBAL_FUNC(_EH_prolog,
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") /* skip ret addr */
"pushl $-1\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl %eax\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl %fs:0\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"movl %esp, %fs:0\n\t"
"movl 12(%esp), %eax\n\t"
"movl %ebp, 12(%esp)\n\t"
"leal 12(%esp), %ebp\n\t"
"pushl %eax\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"ret")
static const SCOPETABLE_V4 *get_scopetable_v4( MSVCRT_EXCEPTION_FRAME *frame, ULONG_PTR cookie )
{
return (const SCOPETABLE_V4 *)((ULONG_PTR)frame->scopetable ^ cookie);
}
static DWORD MSVCRT_nested_handler(PEXCEPTION_RECORD rec,
EXCEPTION_REGISTRATION_RECORD* frame,
PCONTEXT context,
EXCEPTION_REGISTRATION_RECORD** dispatch)
{
if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
return ExceptionContinueSearch;
*dispatch = frame;
return ExceptionCollidedUnwind;
}
static void msvcrt_local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp)
{
EXCEPTION_REGISTRATION_RECORD reg;
TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel);
/* Register a handler in case of a nested exception */
reg.Handler = MSVCRT_nested_handler;
reg.Prev = NtCurrentTeb()->Tib.ExceptionList;
__wine_push_frame(&reg);
while (frame->trylevel != TRYLEVEL_END && frame->trylevel != trylevel)
{
int level = frame->trylevel;
frame->trylevel = frame->scopetable[level].previousTryLevel;
if (!frame->scopetable[level].lpfnFilter)
{
TRACE( "__try block cleanup level %d handler %p ebp %p\n",
level, frame->scopetable[level].lpfnHandler, ebp );
call_unwind_func( frame->scopetable[level].lpfnHandler, ebp );
}
}
__wine_pop_frame(&reg);
TRACE("unwound OK\n");
}
static void msvcrt_local_unwind4( ULONG *cookie, MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp )
{
EXCEPTION_REGISTRATION_RECORD reg;
const SCOPETABLE_V4 *scopetable = get_scopetable_v4( frame, *cookie );
TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel);
/* Register a handler in case of a nested exception */
reg.Handler = MSVCRT_nested_handler;
reg.Prev = NtCurrentTeb()->Tib.ExceptionList;
__wine_push_frame(&reg);
while (frame->trylevel != -2 && frame->trylevel != trylevel)
{
int level = frame->trylevel;
frame->trylevel = scopetable->entries[level].previousTryLevel;
if (!scopetable->entries[level].lpfnFilter)
{
TRACE( "__try block cleanup level %d handler %p ebp %p\n",
level, scopetable->entries[level].lpfnHandler, ebp );
call_unwind_func( scopetable->entries[level].lpfnHandler, ebp );
}
}
__wine_pop_frame(&reg);
TRACE("unwound OK\n");
}
/*******************************************************************
* _local_unwind2 (MSVCRT.@)
*/
void CDECL _local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel)
{
msvcrt_local_unwind2( frame, trylevel, &frame->_ebp );
}
/*******************************************************************
* _local_unwind4 (MSVCRT.@)
*/
void CDECL _local_unwind4( ULONG *cookie, MSVCRT_EXCEPTION_FRAME* frame, int trylevel )
{
msvcrt_local_unwind4( cookie, frame, trylevel, &frame->_ebp );
}
/*******************************************************************
* _global_unwind2 (MSVCRT.@)
*/
void CDECL _global_unwind2(EXCEPTION_REGISTRATION_RECORD* frame)
{
TRACE("(%p)\n",frame);
RtlUnwind( frame, 0, 0, 0 );
}
/*********************************************************************
* _except_handler2 (MSVCRT.@)
*/
int CDECL _except_handler2(PEXCEPTION_RECORD rec,
EXCEPTION_REGISTRATION_RECORD* frame,
PCONTEXT context,
EXCEPTION_REGISTRATION_RECORD** dispatcher)
{
FIXME("exception %x flags=%x at %p handler=%p %p %p stub\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
frame->Handler, context, dispatcher);
return ExceptionContinueSearch;
}
/*********************************************************************
* _except_handler3 (MSVCRT.@)
*/
int CDECL _except_handler3(PEXCEPTION_RECORD rec,
MSVCRT_EXCEPTION_FRAME* frame,
PCONTEXT context, void* dispatcher)
{
int retval, trylevel;
EXCEPTION_POINTERS exceptPtrs;
PSCOPETABLE pScopeTable;
TRACE("exception %x flags=%x at %p handler=%p %p %p semi-stub\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
frame->handler, context, dispatcher);
__asm__ __volatile__ ("cld");
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
/* Unwinding the current frame */
msvcrt_local_unwind2(frame, TRYLEVEL_END, &frame->_ebp);
TRACE("unwound current frame, returning ExceptionContinueSearch\n");
return ExceptionContinueSearch;
}
else
{
/* Hunting for handler */
exceptPtrs.ExceptionRecord = rec;
exceptPtrs.ContextRecord = context;
*((DWORD *)frame-1) = (DWORD)&exceptPtrs;
trylevel = frame->trylevel;
pScopeTable = frame->scopetable;
while (trylevel != TRYLEVEL_END)
{
TRACE( "level %d prev %d filter %p\n", trylevel, pScopeTable[trylevel].previousTryLevel,
pScopeTable[trylevel].lpfnFilter );
if (pScopeTable[trylevel].lpfnFilter)
{
retval = call_filter( pScopeTable[trylevel].lpfnFilter, &exceptPtrs, &frame->_ebp );
TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ?
"CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ?
"EXECUTE_HANDLER" : "CONTINUE_SEARCH");
if (retval == EXCEPTION_CONTINUE_EXECUTION)
return ExceptionContinueExecution;
if (retval == EXCEPTION_EXECUTE_HANDLER)
{
/* Unwind all higher frames, this one will handle the exception */
_global_unwind2((EXCEPTION_REGISTRATION_RECORD*)frame);
msvcrt_local_unwind2(frame, trylevel, &frame->_ebp);
/* Set our trylevel to the enclosing block, and call the __finally
* code, which won't return
*/
frame->trylevel = pScopeTable[trylevel].previousTryLevel;
TRACE("__finally block %p\n",pScopeTable[trylevel].lpfnHandler);
call_finally_block(pScopeTable[trylevel].lpfnHandler, &frame->_ebp);
ERR("Returned from __finally block - expect crash!\n");
}
}
trylevel = pScopeTable[trylevel].previousTryLevel;
}
}
TRACE("reached TRYLEVEL_END, returning ExceptionContinueSearch\n");
return ExceptionContinueSearch;
}
/*********************************************************************
* _except_handler4_common (MSVCRT.@)
*/
int CDECL _except_handler4_common( ULONG *cookie, void (*check_cookie)(void),
EXCEPTION_RECORD *rec, MSVCRT_EXCEPTION_FRAME *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
int retval, trylevel;
EXCEPTION_POINTERS exceptPtrs;
const SCOPETABLE_V4 *scope_table = get_scopetable_v4( frame, *cookie );
TRACE( "exception %x flags=%x at %p handler=%p %p %p cookie=%x scope table=%p cookies=%d/%x,%d/%x\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
frame->handler, context, dispatcher, *cookie, scope_table,
scope_table->gs_cookie_offset, scope_table->gs_cookie_xor,
scope_table->eh_cookie_offset, scope_table->eh_cookie_xor );
/* FIXME: no cookie validation yet */
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
/* Unwinding the current frame */
msvcrt_local_unwind4( cookie, frame, -2, &frame->_ebp );
TRACE("unwound current frame, returning ExceptionContinueSearch\n");
return ExceptionContinueSearch;
}
else
{
/* Hunting for handler */
exceptPtrs.ExceptionRecord = rec;
exceptPtrs.ContextRecord = context;
*((DWORD *)frame-1) = (DWORD)&exceptPtrs;
trylevel = frame->trylevel;
while (trylevel != -2)
{
TRACE( "level %d prev %d filter %p\n", trylevel,
scope_table->entries[trylevel].previousTryLevel,
scope_table->entries[trylevel].lpfnFilter );
if (scope_table->entries[trylevel].lpfnFilter)
{
retval = call_filter( scope_table->entries[trylevel].lpfnFilter, &exceptPtrs, &frame->_ebp );
TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ?
"CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ?
"EXECUTE_HANDLER" : "CONTINUE_SEARCH");
if (retval == EXCEPTION_CONTINUE_EXECUTION)
return ExceptionContinueExecution;
if (retval == EXCEPTION_EXECUTE_HANDLER)
{
/* Unwind all higher frames, this one will handle the exception */
_global_unwind2((EXCEPTION_REGISTRATION_RECORD*)frame);
msvcrt_local_unwind4( cookie, frame, trylevel, &frame->_ebp );
/* Set our trylevel to the enclosing block, and call the __finally
* code, which won't return
*/
frame->trylevel = scope_table->entries[trylevel].previousTryLevel;
TRACE("__finally block %p\n",scope_table->entries[trylevel].lpfnHandler);
call_finally_block(scope_table->entries[trylevel].lpfnHandler, &frame->_ebp);
ERR("Returned from __finally block - expect crash!\n");
}
}
trylevel = scope_table->entries[trylevel].previousTryLevel;
}
}
TRACE("reached -2, returning ExceptionContinueSearch\n");
return ExceptionContinueSearch;
}
/*
* setjmp/longjmp implementation
*/
#define MSVCRT_JMP_MAGIC 0x56433230 /* ID value for new jump structure */
typedef void (__stdcall *MSVCRT_unwind_function)(const struct MSVCRT___JUMP_BUFFER *);
/* define an entrypoint for setjmp/setjmp3 that stores the registers in the jmp buf */
/* and then jumps to the C backend function */
#define DEFINE_SETJMP_ENTRYPOINT(name) \
__ASM_GLOBAL_FUNC( name, \
"movl 4(%esp),%ecx\n\t" /* jmp_buf */ \
"movl %ebp,0(%ecx)\n\t" /* jmp_buf.Ebp */ \
"movl %ebx,4(%ecx)\n\t" /* jmp_buf.Ebx */ \
"movl %edi,8(%ecx)\n\t" /* jmp_buf.Edi */ \
"movl %esi,12(%ecx)\n\t" /* jmp_buf.Esi */ \
"movl %esp,16(%ecx)\n\t" /* jmp_buf.Esp */ \
"movl 0(%esp),%eax\n\t" \
"movl %eax,20(%ecx)\n\t" /* jmp_buf.Eip */ \
"jmp " __ASM_NAME("__regs_") # name )
/* restore the registers from the jmp buf upon longjmp */
extern void DECLSPEC_NORETURN longjmp_set_regs( struct MSVCRT___JUMP_BUFFER *jmp, int retval );
__ASM_GLOBAL_FUNC( longjmp_set_regs,
"movl 4(%esp),%ecx\n\t" /* jmp_buf */
"movl 8(%esp),%eax\n\t" /* retval */
"movl 0(%ecx),%ebp\n\t" /* jmp_buf.Ebp */
"movl 4(%ecx),%ebx\n\t" /* jmp_buf.Ebx */
"movl 8(%ecx),%edi\n\t" /* jmp_buf.Edi */
"movl 12(%ecx),%esi\n\t" /* jmp_buf.Esi */
"movl 16(%ecx),%esp\n\t" /* jmp_buf.Esp */
"addl $4,%esp\n\t" /* get rid of return address */
"jmp *20(%ecx)\n\t" /* jmp_buf.Eip */ )
/*
* The signatures of the setjmp/longjmp functions do not match that
* declared in the setjmp header so they don't follow the regular naming
* convention to avoid conflicts.
*/
/*******************************************************************
* _setjmp (MSVCRT.@)
*/
DEFINE_SETJMP_ENTRYPOINT(MSVCRT__setjmp)
int CDECL __regs_MSVCRT__setjmp(struct MSVCRT___JUMP_BUFFER *jmp)
{
jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
if (jmp->Registration == ~0UL)
jmp->TryLevel = TRYLEVEL_END;
else
jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
return 0;
}
/*******************************************************************
* _setjmp3 (MSVCRT.@)
*/
DEFINE_SETJMP_ENTRYPOINT( MSVCRT__setjmp3 )
int CDECL __regs_MSVCRT__setjmp3(struct MSVCRT___JUMP_BUFFER *jmp, int nb_args, ...)
{
jmp->Cookie = MSVCRT_JMP_MAGIC;
jmp->UnwindFunc = 0;
jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList;
if (jmp->Registration == ~0UL)
{
jmp->TryLevel = TRYLEVEL_END;
}
else
{
int i;
va_list args;
va_start( args, nb_args );
if (nb_args > 0) jmp->UnwindFunc = va_arg( args, unsigned long );
if (nb_args > 1) jmp->TryLevel = va_arg( args, unsigned long );
else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
for (i = 0; i < 6 && i < nb_args - 2; i++)
jmp->UnwindData[i] = va_arg( args, unsigned long );
va_end( args );
}
TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n",
jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration );
return 0;
}
/*********************************************************************
* longjmp (MSVCRT.@)
*/
void CDECL MSVCRT_longjmp(struct MSVCRT___JUMP_BUFFER *jmp, int retval)
{
unsigned long cur_frame = 0;
TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx retval=%08x\n",
jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration, retval );
cur_frame=(unsigned long)NtCurrentTeb()->Tib.ExceptionList;
TRACE("cur_frame=%lx\n",cur_frame);
if (cur_frame != jmp->Registration)
_global_unwind2((EXCEPTION_REGISTRATION_RECORD*)jmp->Registration);
if (jmp->Registration)
{
if (IsBadReadPtr(&jmp->Cookie, sizeof(long)) || jmp->Cookie != MSVCRT_JMP_MAGIC)
{
msvcrt_local_unwind2((MSVCRT_EXCEPTION_FRAME*)jmp->Registration,
jmp->TryLevel, (void *)jmp->Ebp);
}
else if(jmp->UnwindFunc)
{
MSVCRT_unwind_function unwind_func;
unwind_func=(MSVCRT_unwind_function)jmp->UnwindFunc;
unwind_func(jmp);
}
}
if (!retval)
retval = 1;
longjmp_set_regs( jmp, retval );
}
/*********************************************************************
* _seh_longjmp_unwind (MSVCRT.@)
*/
void __stdcall _seh_longjmp_unwind(struct MSVCRT___JUMP_BUFFER *jmp)
{
msvcrt_local_unwind2( (MSVCRT_EXCEPTION_FRAME *)jmp->Registration, jmp->TryLevel, (void *)jmp->Ebp );
}
/*********************************************************************
* _seh_longjmp_unwind4 (MSVCRT.@)
*/
void __stdcall _seh_longjmp_unwind4(struct MSVCRT___JUMP_BUFFER *jmp)
{
msvcrt_local_unwind4( (void *)jmp->Cookie, (MSVCRT_EXCEPTION_FRAME *)jmp->Registration,
jmp->TryLevel, (void *)jmp->Ebp );
}
#endif /* __i386__ */
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