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wine/dlls/ntdll/signal_i386.c
Zebediah Figura f5fef036fd ntdll: Also print %ss in dispatch_exception(). 
Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
2021-09-28 21:48:59 +02:00

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/*
* i386 signal handling routines
*
* Copyright 1999 Alexandre Julliard
*
* 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 __i386__
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/types.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "ntdll_misc.h"
#include "wine/exception.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
struct x86_thread_data
{
DWORD fs; /* 1d4 TEB selector */
DWORD gs; /* 1d8 libc selector; update winebuild if you move this! */
DWORD dr0; /* 1dc debug registers */
DWORD dr1; /* 1e0 */
DWORD dr2; /* 1e4 */
DWORD dr3; /* 1e8 */
DWORD dr6; /* 1ec */
DWORD dr7; /* 1f0 */
void *exit_frame; /* 1f4 exit frame pointer */
};
C_ASSERT( sizeof(struct x86_thread_data) <= 16 * sizeof(void *) );
C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, gs ) == 0x1d8 );
C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, exit_frame ) == 0x1f4 );
static inline struct x86_thread_data *x86_thread_data(void)
{
return (struct x86_thread_data *)&NtCurrentTeb()->GdiTebBatch;
}
struct ldt_copy *__wine_ldt_copy = NULL;
/* Exception record for handling exceptions happening inside exception handlers */
typedef struct
{
EXCEPTION_REGISTRATION_RECORD frame;
EXCEPTION_REGISTRATION_RECORD *prevFrame;
} EXC_NESTED_FRAME;
extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler );
/*******************************************************************
* is_valid_frame
*/
static inline BOOL is_valid_frame( void *frame )
{
if ((ULONG_PTR)frame & 3) return FALSE;
return (frame >= NtCurrentTeb()->Tib.StackLimit &&
(void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1);
}
/*******************************************************************
* raise_handler
*
* Handler for exceptions happening inside a handler.
*/
static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
return ExceptionContinueSearch;
/* We shouldn't get here so we store faulty frame in dispatcher */
*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
return ExceptionNestedException;
}
/*******************************************************************
* unwind_handler
*
* Handler for exceptions happening inside an unwind handler.
*/
static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
return ExceptionContinueSearch;
/* We shouldn't get here so we store faulty frame in dispatcher */
*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
return ExceptionCollidedUnwind;
}
/**********************************************************************
* call_stack_handlers
*
* Call the stack handlers chain.
*/
static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
{
EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
DWORD res;
frame = NtCurrentTeb()->Tib.ExceptionList;
nested_frame = NULL;
while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
{
/* Check frame address */
if (!is_valid_frame( frame ))
{
rec->ExceptionFlags |= EH_STACK_INVALID;
break;
}
/* Call handler */
TRACE( "calling handler at %p code=%x flags=%x\n",
frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, raise_handler );
TRACE( "handler at %p returned %x\n", frame->Handler, res );
if (frame == nested_frame)
{
/* no longer nested */
nested_frame = NULL;
rec->ExceptionFlags &= ~EH_NESTED_CALL;
}
switch(res)
{
case ExceptionContinueExecution:
if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
return STATUS_NONCONTINUABLE_EXCEPTION;
case ExceptionContinueSearch:
break;
case ExceptionNestedException:
if (nested_frame < dispatch) nested_frame = dispatch;
rec->ExceptionFlags |= EH_NESTED_CALL;
break;
default:
return STATUS_INVALID_DISPOSITION;
}
frame = frame->Prev;
}
return STATUS_UNHANDLED_EXCEPTION;
}
/*******************************************************************
* KiUserExceptionDispatcher (NTDLL.@)
*/
NTSTATUS WINAPI dispatch_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
NTSTATUS status;
DWORD c;
TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
context->Eip, GetCurrentThreadId() );
for (c = 0; c < rec->NumberParameters; c++)
TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
{
if (rec->ExceptionInformation[1] >> 16)
MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
rec->ExceptionAddress,
(char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
else
MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
rec->ExceptionAddress,
(char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
}
else if (rec->ExceptionCode == EXCEPTION_WINE_NAME_THREAD && rec->ExceptionInformation[0] == 0x1000)
{
WARN( "Thread %04x renamed to %s\n", (DWORD)rec->ExceptionInformation[2], debugstr_a((char *)rec->ExceptionInformation[1]) );
}
else if (rec->ExceptionCode == DBG_PRINTEXCEPTION_C)
{
WARN( "%s\n", debugstr_an((char *)rec->ExceptionInformation[1], rec->ExceptionInformation[0] - 1) );
}
else if (rec->ExceptionCode == DBG_PRINTEXCEPTION_WIDE_C)
{
WARN( "%s\n", debugstr_wn((WCHAR *)rec->ExceptionInformation[1], rec->ExceptionInformation[0] - 1) );
}
else
{
if (rec->ExceptionCode == STATUS_ASSERTION_FAILURE)
ERR( "%s exception (code=%x) raised\n", debugstr_exception_code(rec->ExceptionCode), rec->ExceptionCode );
else
WARN( "%s exception (code=%x) raised\n", debugstr_exception_code(rec->ExceptionCode), rec->ExceptionCode );
TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
context->Eax, context->Ebx, context->Ecx,
context->Edx, context->Esi, context->Edi );
TRACE(" ebp=%08x esp=%08x cs=%04x ss=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
context->Ebp, context->Esp, context->SegCs, context->SegSs, context->SegDs,
context->SegEs, context->SegFs, context->SegGs, context->EFlags );
}
if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
NtContinue( context, FALSE );
if ((status = call_stack_handlers( rec, context )) == STATUS_SUCCESS)
NtContinue( context, FALSE );
if (status != STATUS_UNHANDLED_EXCEPTION) RtlRaiseStatus( status );
return NtRaiseException( rec, context, FALSE );
}
__ASM_STDCALL_FUNC( KiUserExceptionDispatcher, 8,
"pushl 4(%esp)\n\t"
"pushl 4(%esp)\n\t"
"call " __ASM_STDCALL("dispatch_exception", 8) "\n\t"
"int3" )
/*******************************************************************
* KiUserApcDispatcher (NTDLL.@)
*/
void WINAPI KiUserApcDispatcher( CONTEXT *context, ULONG_PTR ctx, ULONG_PTR arg1, ULONG_PTR arg2,
PNTAPCFUNC func )
{
func( ctx, arg1, arg2 );
NtContinue( context, TRUE );
}
/*******************************************************************
* KiUserCallbackDispatcher (NTDLL.@)
*/
void WINAPI KiUserCallbackDispatcher( ULONG id, void *args, ULONG len )
{
NTSTATUS (WINAPI *func)(void *, ULONG) = ((void **)NtCurrentTeb()->Peb->KernelCallbackTable)[id];
RtlRaiseStatus( NtCallbackReturn( NULL, 0, func( args, len )));
}
/***********************************************************************
* save_fpu
*
* Save the thread FPU context.
*/
static inline void save_fpu( CONTEXT *context )
{
#ifdef __GNUC__
struct
{
DWORD ControlWord;
DWORD StatusWord;
DWORD TagWord;
DWORD ErrorOffset;
DWORD ErrorSelector;
DWORD DataOffset;
DWORD DataSelector;
}
float_status;
context->ContextFlags |= CONTEXT_FLOATING_POINT;
__asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
/* Reset unmasked exceptions status to avoid firing an exception. */
memcpy(&float_status, &context->FloatSave, sizeof(float_status));
float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
__asm__ __volatile__( "fldenv %0" : : "m" (float_status) );
#endif
}
/***********************************************************************
* save_fpux
*
* Save the thread FPU extended context.
*/
static inline void save_fpux( CONTEXT *context )
{
#ifdef __GNUC__
/* we have to enforce alignment by hand */
char buffer[sizeof(XSAVE_FORMAT) + 16];
XSAVE_FORMAT *state = (XSAVE_FORMAT *)(((ULONG_PTR)buffer + 15) & ~15);
context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
__asm__ __volatile__( "fxsave %0" : "=m" (*state) );
memcpy( context->ExtendedRegisters, state, sizeof(*state) );
#endif
}
/***********************************************************************
* RtlCaptureContext (NTDLL.@)
*/
__ASM_STDCALL_FUNC( RtlCaptureContext, 4,
"pushl %eax\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"movl 8(%esp),%eax\n\t" /* context */
"movl $0x10007,(%eax)\n\t" /* context->ContextFlags */
"movw %gs,0x8c(%eax)\n\t" /* context->SegGs */
"movw %fs,0x90(%eax)\n\t" /* context->SegFs */
"movw %es,0x94(%eax)\n\t" /* context->SegEs */
"movw %ds,0x98(%eax)\n\t" /* context->SegDs */
"movl %edi,0x9c(%eax)\n\t" /* context->Edi */
"movl %esi,0xa0(%eax)\n\t" /* context->Esi */
"movl %ebx,0xa4(%eax)\n\t" /* context->Ebx */
"movl %edx,0xa8(%eax)\n\t" /* context->Edx */
"movl %ecx,0xac(%eax)\n\t" /* context->Ecx */
"movl 0(%ebp),%edx\n\t"
"movl %edx,0xb4(%eax)\n\t" /* context->Ebp */
"movl 4(%ebp),%edx\n\t"
"movl %edx,0xb8(%eax)\n\t" /* context->Eip */
"movw %cs,0xbc(%eax)\n\t" /* context->SegCs */
"pushfl\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"popl 0xc0(%eax)\n\t" /* context->EFlags */
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"leal 8(%ebp),%edx\n\t"
"movl %edx,0xc4(%eax)\n\t" /* context->Esp */
"movw %ss,0xc8(%eax)\n\t" /* context->SegSs */
"popl 0xb0(%eax)\n\t" /* context->Eax */
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"ret $4" )
/*******************************************************************
* RtlUnwind (NTDLL.@)
*/
void WINAPI DECLSPEC_HIDDEN __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp,
PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context )
{
EXCEPTION_RECORD record;
EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
DWORD res;
context->Eax = (DWORD)retval;
/* build an exception record, if we do not have one */
if (!pRecord)
{
record.ExceptionCode = STATUS_UNWIND;
record.ExceptionFlags = 0;
record.ExceptionRecord = NULL;
record.ExceptionAddress = (void *)context->Eip;
record.NumberParameters = 0;
pRecord = &record;
}
pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
TRACE( "eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi );
TRACE( "ebp=%08x esp=%08x eip=%08x cs=%04x ds=%04x fs=%04x gs=%04x flags=%08x\n",
context->Ebp, context->Esp, context->Eip, LOWORD(context->SegCs), LOWORD(context->SegDs),
LOWORD(context->SegFs), LOWORD(context->SegGs), context->EFlags );
/* get chain of exception frames */
frame = NtCurrentTeb()->Tib.ExceptionList;
while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
{
/* Check frame address */
if (pEndFrame && (frame > pEndFrame))
raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord );
if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, pRecord );
/* Call handler */
TRACE( "calling handler at %p code=%x flags=%x\n",
frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler );
TRACE( "handler at %p returned %x\n", frame->Handler, res );
switch(res)
{
case ExceptionContinueSearch:
break;
case ExceptionCollidedUnwind:
frame = dispatch;
break;
default:
raise_status( STATUS_INVALID_DISPOSITION, pRecord );
break;
}
frame = __wine_pop_frame( frame );
}
NtContinue( context, FALSE );
}
__ASM_STDCALL_FUNC( RtlUnwind, 16,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"leal -(0x2cc+8)(%esp),%esp\n\t" /* sizeof(CONTEXT) + alignment */
"pushl %eax\n\t"
"leal 4(%esp),%eax\n\t" /* context */
"xchgl %eax,(%esp)\n\t"
"call " __ASM_STDCALL("RtlCaptureContext",4) "\n\t"
"leal 24(%ebp),%eax\n\t"
"movl %eax,0xc4(%esp)\n\t" /* context->Esp */
"pushl %esp\n\t"
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"call " __ASM_STDCALL("__regs_RtlUnwind",20) "\n\t"
"leave\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $16" ) /* actually never returns */
/*******************************************************************
* raise_exception_full_context
*
* Raise an exception with the full CPU context.
*/
void raise_exception_full_context( EXCEPTION_RECORD *rec, CONTEXT *context )
{
save_fpu( context );
save_fpux( context );
/* FIXME: xstate */
context->Dr0 = x86_thread_data()->dr0;
context->Dr1 = x86_thread_data()->dr1;
context->Dr2 = x86_thread_data()->dr2;
context->Dr3 = x86_thread_data()->dr3;
context->Dr6 = x86_thread_data()->dr6;
context->Dr7 = x86_thread_data()->dr7;
context->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
RtlRaiseStatus( NtRaiseException( rec, context, TRUE ));
}
/***********************************************************************
* RtlRaiseException (NTDLL.@)
*/
__ASM_STDCALL_FUNC( RtlRaiseException, 4,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"leal -0x2cc(%esp),%esp\n\t" /* sizeof(CONTEXT) */
"pushl %esp\n\t" /* context */
"call " __ASM_STDCALL("RtlCaptureContext",4) "\n\t"
"movl 4(%ebp),%eax\n\t" /* return address */
"movl 8(%ebp),%ecx\n\t" /* rec */
"movl %eax,12(%ecx)\n\t" /* rec->ExceptionAddress */
"leal 12(%ebp),%eax\n\t"
"movl %eax,0xc4(%esp)\n\t" /* context->Esp */
"movl %esp,%eax\n\t"
"pushl %eax\n\t"
"pushl %ecx\n\t"
"call " __ASM_NAME("raise_exception_full_context") "\n\t"
"leave\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $4" ) /* actually never returns */
/*************************************************************************
* RtlCaptureStackBackTrace (NTDLL.@)
*/
USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
{
CONTEXT context;
ULONG i;
ULONG *frame;
RtlCaptureContext( &context );
if (hash) *hash = 0;
frame = (ULONG *)context.Ebp;
while (skip--)
{
if (!is_valid_frame( frame )) return 0;
frame = (ULONG *)*frame;
}
for (i = 0; i < count; i++)
{
if (!is_valid_frame( frame )) break;
buffer[i] = (void *)frame[1];
if (hash) *hash += frame[1];
frame = (ULONG *)*frame;
}
return i;
}
/***********************************************************************
* signal_start_thread
*/
__ASM_GLOBAL_FUNC( signal_start_thread,
"movl 4(%esp),%esi\n\t" /* context */
"leal -12(%esi),%edi\n\t"
/* clear the thread stack */
"andl $~0xfff,%edi\n\t" /* round down to page size */
"movl $0xf0000,%ecx\n\t"
"subl %ecx,%edi\n\t"
"movl %edi,%esp\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) )
/**********************************************************************
* DbgBreakPoint (NTDLL.@)
*/
__ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret"
"\n\tnop; nop; nop; nop; nop; nop; nop; nop"
"\n\tnop; nop; nop; nop; nop; nop" );
/**********************************************************************
* DbgUserBreakPoint (NTDLL.@)
*/
__ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret"
"\n\tnop; nop; nop; nop; nop; nop; nop; nop"
"\n\tnop; nop; nop; nop; nop; nop" );
/**********************************************************************
* NtCurrentTeb (NTDLL.@)
*/
__ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
/**************************************************************************
* _chkstk (NTDLL.@)
*/
__ASM_GLOBAL_FUNC( _chkstk,
"negl %eax\n\t"
"addl %esp,%eax\n\t"
"xchgl %esp,%eax\n\t"
"movl 0(%eax),%eax\n\t" /* copy return address from old location */
"movl %eax,0(%esp)\n\t"
"ret" )
/**************************************************************************
* _alloca_probe (NTDLL.@)
*/
__ASM_GLOBAL_FUNC( _alloca_probe,
"negl %eax\n\t"
"addl %esp,%eax\n\t"
"xchgl %esp,%eax\n\t"
"movl 0(%eax),%eax\n\t" /* copy return address from old location */
"movl %eax,0(%esp)\n\t"
"ret" )
/**********************************************************************
* EXC_CallHandler (internal)
*
* Some exception handlers depend on EBP to have a fixed position relative to
* the exception frame.
* Shrinker depends on (*1) doing what it does,
* (*2) being the exact instruction it is and (*3) beginning with 0x64
* (i.e. the %fs prefix to the movl instruction). It also depends on the
* function calling the handler having only 5 parameters (*4).
*/
__ASM_GLOBAL_FUNC( EXC_CallHandler,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushl %ebx\n\t"
__ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
"movl 28(%ebp), %edx\n\t" /* ugly hack to pass the 6th param needed because of Shrinker */
"pushl 24(%ebp)\n\t"
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"call " __ASM_NAME("call_exception_handler") "\n\t"
"popl %ebx\n\t"
__ASM_CFI(".cfi_same_value %ebx\n\t")
"leave\n"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret" )
__ASM_GLOBAL_FUNC(call_exception_handler,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"subl $12,%esp\n\t"
"pushl 12(%ebp)\n\t" /* make any exceptions in this... */
"pushl %edx\n\t" /* handler be handled by... */
".byte 0x64\n\t"
"pushl (0)\n\t" /* nested_handler (passed in edx). */
".byte 0x64\n\t"
"movl %esp,(0)\n\t" /* push the new exception frame onto the exception stack. */
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"movl 24(%ebp), %ecx\n\t" /* (*1) */
"call *%ecx\n\t" /* call handler. (*2) */
".byte 0x64\n\t"
"movl (0), %esp\n\t" /* restore previous... (*3) */
".byte 0x64\n\t"
"popl (0)\n\t" /* exception frame. */
"movl %ebp, %esp\n\t" /* restore saved stack, in case it was corrupted */
"popl %ebp\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $20" ) /* (*4) */
#endif /* __i386__ */
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