mirror of
git://source.winehq.org/git/wine.git
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688 lines
25 KiB
C
688 lines
25 KiB
C
/*
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* i386 signal handling routines
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*
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* Copyright 1999 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifdef __i386__
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "ntdll_misc.h"
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#include "wine/exception.h"
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#include "wine/debug.h"
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#include "ntsyscalls.h"
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WINE_DEFAULT_DEBUG_CHANNEL(seh);
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WINE_DECLARE_DEBUG_CHANNEL(relay);
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struct x86_thread_data
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{
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DWORD fs; /* 1d4 TEB selector */
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DWORD gs; /* 1d8 libc selector; update winebuild if you move this! */
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DWORD dr0; /* 1dc debug registers */
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DWORD dr1; /* 1e0 */
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DWORD dr2; /* 1e4 */
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DWORD dr3; /* 1e8 */
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DWORD dr6; /* 1ec */
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DWORD dr7; /* 1f0 */
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void *exit_frame; /* 1f4 exit frame pointer */
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};
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C_ASSERT( sizeof(struct x86_thread_data) <= 16 * sizeof(void *) );
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C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, gs ) == 0x1d8 );
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C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, exit_frame ) == 0x1f4 );
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static inline struct x86_thread_data *x86_thread_data(void)
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{
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return (struct x86_thread_data *)&NtCurrentTeb()->GdiTebBatch;
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}
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/* Exception record for handling exceptions happening inside exception handlers */
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typedef struct
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{
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EXCEPTION_REGISTRATION_RECORD frame;
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EXCEPTION_REGISTRATION_RECORD *prevFrame;
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} EXC_NESTED_FRAME;
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extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
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CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
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PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler );
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#ifdef __WINE_PE_BUILD
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enum syscall_ids
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{
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#define SYSCALL_ENTRY(id,name,args) __id_##name = id,
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ALL_SYSCALLS32
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#undef SYSCALL_ENTRY
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};
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/*******************************************************************
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* NtQueryInformationProcess
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*/
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void NtQueryInformationProcess_wrapper(void)
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{
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asm( ".globl " __ASM_STDCALL("NtQueryInformationProcess", 20) "\n"
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__ASM_STDCALL("NtQueryInformationProcess", 20) ":\n\t"
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"movl %0,%%eax\n\t"
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"call *%%fs:0xc0\n\t"
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"ret $20" :: "i" (__id_NtQueryInformationProcess) );
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}
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#define NtQueryInformationProcess syscall_NtQueryInformationProcess
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#endif /* __WINE_PE_BUILD */
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/*******************************************************************
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* syscalls
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*/
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#define SYSCALL_ENTRY(id,name,args) __ASM_SYSCALL_FUNC( id, name, args )
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ALL_SYSCALLS32
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DEFINE_SYSCALL_HELPER32()
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#undef SYSCALL_ENTRY
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/*******************************************************************
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* raise_handler
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*
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* Handler for exceptions happening inside a handler.
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*/
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static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
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CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
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{
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if (rec->ExceptionFlags & (EXCEPTION_UNWINDING | EXCEPTION_EXIT_UNWIND))
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return ExceptionContinueSearch;
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/* We shouldn't get here so we store faulty frame in dispatcher */
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*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
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return ExceptionNestedException;
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}
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/*******************************************************************
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* unwind_handler
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*
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* Handler for exceptions happening inside an unwind handler.
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*/
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static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
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CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
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{
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if (!(rec->ExceptionFlags & (EXCEPTION_UNWINDING | EXCEPTION_EXIT_UNWIND)))
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return ExceptionContinueSearch;
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/* We shouldn't get here so we store faulty frame in dispatcher */
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*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
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return ExceptionCollidedUnwind;
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}
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/**********************************************************************
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* call_seh_handlers
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*
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* Call the SEH handlers chain.
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*/
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NTSTATUS call_seh_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
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{
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EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
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DWORD res;
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frame = NtCurrentTeb()->Tib.ExceptionList;
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nested_frame = NULL;
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while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
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{
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/* Check frame address */
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if (!is_valid_frame( (ULONG_PTR)frame ))
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{
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rec->ExceptionFlags |= EXCEPTION_STACK_INVALID;
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break;
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}
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/* Call handler */
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TRACE( "calling handler at %p code=%lx flags=%lx\n",
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frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
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res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, raise_handler );
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TRACE( "handler at %p returned %lx\n", frame->Handler, res );
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if (frame == nested_frame)
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{
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/* no longer nested */
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nested_frame = NULL;
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rec->ExceptionFlags &= ~EXCEPTION_NESTED_CALL;
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}
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switch(res)
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{
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case ExceptionContinueExecution:
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if (!(rec->ExceptionFlags & EXCEPTION_NONCONTINUABLE)) return STATUS_SUCCESS;
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return STATUS_NONCONTINUABLE_EXCEPTION;
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case ExceptionContinueSearch:
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break;
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case ExceptionNestedException:
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if (nested_frame < dispatch) nested_frame = dispatch;
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rec->ExceptionFlags |= EXCEPTION_NESTED_CALL;
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break;
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default:
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return STATUS_INVALID_DISPOSITION;
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}
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frame = frame->Prev;
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}
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return STATUS_UNHANDLED_EXCEPTION;
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}
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/*******************************************************************
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* KiUserExceptionDispatcher (NTDLL.@)
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*/
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__ASM_STDCALL_FUNC( KiUserExceptionDispatcher, 8,
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"pushl 4(%esp)\n\t"
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"pushl 4(%esp)\n\t"
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"call " __ASM_STDCALL("dispatch_exception", 8) "\n\t"
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"int3" )
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/*******************************************************************
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* KiUserApcDispatcher (NTDLL.@)
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*/
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__ASM_STDCALL_FUNC( KiUserApcDispatcher, 20,
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"leal 0x14(%esp),%ebx\n\t" /* context */
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"pop %eax\n\t" /* func */
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"call *%eax\n\t"
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"pushl -4(%ebx)\n\t" /* alertable */
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"pushl %ebx\n\t" /* context */
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"call " __ASM_STDCALL("NtContinue", 8) "\n\t"
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"int3" )
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/*******************************************************************
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* KiUserCallbackDispatcher (NTDLL.@)
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*/
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void WINAPI KiUserCallbackDispatcher( ULONG id, void *args, ULONG len )
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{
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NTSTATUS status = dispatch_user_callback( args, len, id );
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status = NtCallbackReturn( NULL, 0, status );
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for (;;) RtlRaiseStatus( status );
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}
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/***********************************************************************
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* save_fpu
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*
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* Save the thread FPU context.
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*/
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static inline void save_fpu( CONTEXT *context )
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{
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#ifdef __GNUC__
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struct
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{
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DWORD ControlWord;
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DWORD StatusWord;
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DWORD TagWord;
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DWORD ErrorOffset;
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DWORD ErrorSelector;
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DWORD DataOffset;
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DWORD DataSelector;
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}
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float_status;
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context->ContextFlags |= CONTEXT_FLOATING_POINT;
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__asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
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/* Reset unmasked exceptions status to avoid firing an exception. */
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memcpy(&float_status, &context->FloatSave, sizeof(float_status));
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float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
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__asm__ __volatile__( "fldenv %0" : : "m" (float_status) );
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#endif
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}
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/***********************************************************************
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* save_fpux
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*
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* Save the thread FPU extended context.
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*/
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static inline void save_fpux( CONTEXT *context )
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{
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#ifdef __GNUC__
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/* we have to enforce alignment by hand */
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char buffer[sizeof(XSAVE_FORMAT) + 16];
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XSAVE_FORMAT *state = (XSAVE_FORMAT *)(((ULONG_PTR)buffer + 15) & ~15);
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context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
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__asm__ __volatile__( "fxsave %0" : "=m" (*state) );
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memcpy( context->ExtendedRegisters, state, sizeof(*state) );
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#endif
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}
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/***********************************************************************
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* RtlCaptureContext (NTDLL.@)
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*/
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__ASM_STDCALL_FUNC( RtlCaptureContext, 4,
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"pushl %eax\n\t"
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__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
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"movl 8(%esp),%eax\n\t" /* context */
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"movl $0x10007,(%eax)\n\t" /* context->ContextFlags */
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"movw %gs,0x8c(%eax)\n\t" /* context->SegGs */
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"movw %fs,0x90(%eax)\n\t" /* context->SegFs */
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"movw %es,0x94(%eax)\n\t" /* context->SegEs */
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"movw %ds,0x98(%eax)\n\t" /* context->SegDs */
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"movl %edi,0x9c(%eax)\n\t" /* context->Edi */
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"movl %esi,0xa0(%eax)\n\t" /* context->Esi */
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"movl %ebx,0xa4(%eax)\n\t" /* context->Ebx */
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"movl %edx,0xa8(%eax)\n\t" /* context->Edx */
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"movl %ecx,0xac(%eax)\n\t" /* context->Ecx */
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"movl 0(%ebp),%edx\n\t"
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"movl %edx,0xb4(%eax)\n\t" /* context->Ebp */
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"movl 4(%ebp),%edx\n\t"
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"movl %edx,0xb8(%eax)\n\t" /* context->Eip */
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"movw %cs,0xbc(%eax)\n\t" /* context->SegCs */
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"pushfl\n\t"
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__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
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"popl 0xc0(%eax)\n\t" /* context->EFlags */
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__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
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"leal 8(%ebp),%edx\n\t"
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"movl %edx,0xc4(%eax)\n\t" /* context->Esp */
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"movw %ss,0xc8(%eax)\n\t" /* context->SegSs */
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"popl 0xb0(%eax)\n\t" /* context->Eax */
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__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
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"ret $4" )
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/*******************************************************************
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* RtlRestoreContext (NTDLL.@)
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*/
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void CDECL RtlRestoreContext( CONTEXT *context, EXCEPTION_RECORD *rec )
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{
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TRACE( "returning to %p stack %p\n", (void *)context->Eip, (void *)context->Esp );
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NtContinue( context, FALSE );
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}
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/*******************************************************************
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* RtlUnwind (NTDLL.@)
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*/
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void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp,
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PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context )
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{
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EXCEPTION_RECORD record;
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EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
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DWORD res;
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context->Eax = (DWORD)retval;
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/* build an exception record, if we do not have one */
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if (!pRecord)
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{
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record.ExceptionCode = STATUS_UNWIND;
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record.ExceptionFlags = 0;
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record.ExceptionRecord = NULL;
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record.ExceptionAddress = (void *)context->Eip;
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record.NumberParameters = 0;
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pRecord = &record;
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}
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pRecord->ExceptionFlags |= EXCEPTION_UNWINDING | (pEndFrame ? 0 : EXCEPTION_EXIT_UNWIND);
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TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
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TRACE_CONTEXT( context );
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/* get chain of exception frames */
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frame = NtCurrentTeb()->Tib.ExceptionList;
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while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
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{
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/* Check frame address */
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if (pEndFrame && (frame > pEndFrame))
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raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord );
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if (!is_valid_frame( (ULONG_PTR)frame )) raise_status( STATUS_BAD_STACK, pRecord );
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/* Call handler */
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TRACE( "calling handler at %p code=%lx flags=%lx\n",
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frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
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res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler );
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TRACE( "handler at %p returned %lx\n", frame->Handler, res );
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switch(res)
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{
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case ExceptionContinueSearch:
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break;
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case ExceptionCollidedUnwind:
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frame = dispatch;
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break;
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default:
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raise_status( STATUS_INVALID_DISPOSITION, pRecord );
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break;
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}
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frame = __wine_pop_frame( frame );
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}
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NtContinue( context, FALSE );
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}
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__ASM_STDCALL_FUNC( RtlUnwind, 16,
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"pushl %ebp\n\t"
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__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
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__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
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"movl %esp,%ebp\n\t"
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__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
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"leal -(0x2cc+8)(%esp),%esp\n\t" /* sizeof(CONTEXT) + alignment */
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"pushl %eax\n\t"
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"leal 4(%esp),%eax\n\t" /* context */
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"xchgl %eax,(%esp)\n\t"
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"call " __ASM_STDCALL("RtlCaptureContext",4) "\n\t"
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"leal 24(%ebp),%eax\n\t"
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"movl %eax,0xc4(%esp)\n\t" /* context->Esp */
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"pushl %esp\n\t"
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"pushl 20(%ebp)\n\t"
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"pushl 16(%ebp)\n\t"
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"pushl 12(%ebp)\n\t"
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"pushl 8(%ebp)\n\t"
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"call " __ASM_STDCALL("__regs_RtlUnwind",20) "\n\t"
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"leave\n\t"
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__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
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__ASM_CFI(".cfi_same_value %ebp\n\t")
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"ret $16" ) /* actually never returns */
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/*******************************************************************
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* raise_exception_full_context
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*
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* Raise an exception with the full CPU context.
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*/
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void raise_exception_full_context( EXCEPTION_RECORD *rec, CONTEXT *context )
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{
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save_fpu( context );
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save_fpux( context );
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/* FIXME: xstate */
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context->Dr0 = x86_thread_data()->dr0;
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context->Dr1 = x86_thread_data()->dr1;
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context->Dr2 = x86_thread_data()->dr2;
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context->Dr3 = x86_thread_data()->dr3;
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context->Dr6 = x86_thread_data()->dr6;
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context->Dr7 = x86_thread_data()->dr7;
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context->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
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RtlRaiseStatus( NtRaiseException( rec, context, TRUE ));
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}
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/***********************************************************************
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* RtlRaiseException (NTDLL.@)
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*/
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__ASM_STDCALL_FUNC( RtlRaiseException, 4,
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"pushl %ebp\n\t"
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__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
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__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
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"movl %esp,%ebp\n\t"
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__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
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"leal -0x2cc(%esp),%esp\n\t" /* sizeof(CONTEXT) */
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"pushl %esp\n\t" /* context */
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"call " __ASM_STDCALL("RtlCaptureContext",4) "\n\t"
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"movl 4(%ebp),%eax\n\t" /* return address */
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"movl 8(%ebp),%ecx\n\t" /* rec */
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"movl %eax,12(%ecx)\n\t" /* rec->ExceptionAddress */
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"leal 12(%ebp),%eax\n\t"
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"movl %eax,0xc4(%esp)\n\t" /* context->Esp */
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"movl %esp,%eax\n\t"
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"pushl %eax\n\t"
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"pushl %ecx\n\t"
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"call " __ASM_NAME("raise_exception_full_context") "\n\t"
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"leave\n\t"
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__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
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__ASM_CFI(".cfi_same_value %ebp\n\t")
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"ret $4" ) /* actually never returns */
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/*************************************************************************
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* RtlWalkFrameChain (NTDLL.@)
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*/
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ULONG WINAPI RtlWalkFrameChain( void **buffer, ULONG count, ULONG flags )
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{
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CONTEXT context;
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ULONG *frame;
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ULONG i, skip = flags >> 8, pos = 0;
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RtlCaptureContext( &context );
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for (i = 0; i < count; i++)
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{
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if (!is_valid_frame( context.Ebp )) break;
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if (i >= skip) buffer[pos++] = (void *)context.Eip;
|
|
frame = (ULONG *)context.Ebp;
|
|
context.Ebp = frame[0];
|
|
context.Eip = frame[1];
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* RtlUserThreadStart (NTDLL.@)
|
|
*/
|
|
__ASM_STDCALL_FUNC( RtlUserThreadStart, 8,
|
|
"movl %ebx,8(%esp)\n\t" /* arg */
|
|
"movl %eax,4(%esp)\n\t" /* entry */
|
|
"jmp " __ASM_NAME("call_thread_func") )
|
|
|
|
/* wrapper to call BaseThreadInitThunk */
|
|
extern void DECLSPEC_NORETURN call_thread_func_wrapper( void *thunk, PRTL_THREAD_START_ROUTINE entry, void *arg );
|
|
__ASM_GLOBAL_FUNC( call_thread_func_wrapper,
|
|
"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 $4,%esp\n\t"
|
|
"andl $~0xf,%esp\n\t"
|
|
"xorl %ecx,%ecx\n\t"
|
|
"movl 12(%ebp),%edx\n\t"
|
|
"movl 16(%ebp),%eax\n\t"
|
|
"movl %eax,(%esp)\n\t"
|
|
"call *8(%ebp)" )
|
|
|
|
void call_thread_func( PRTL_THREAD_START_ROUTINE entry, void *arg )
|
|
{
|
|
__TRY
|
|
{
|
|
call_thread_func_wrapper( pBaseThreadInitThunk, entry, arg );
|
|
}
|
|
__EXCEPT(call_unhandled_exception_filter)
|
|
{
|
|
NtTerminateProcess( GetCurrentProcess(), GetExceptionCode() );
|
|
}
|
|
__ENDTRY
|
|
}
|
|
|
|
/***********************************************************************
|
|
* signal_start_thread
|
|
*/
|
|
extern void CDECL DECLSPEC_NORETURN signal_start_thread( CONTEXT *ctx );
|
|
__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) )
|
|
|
|
/******************************************************************
|
|
* LdrInitializeThunk (NTDLL.@)
|
|
*/
|
|
void WINAPI LdrInitializeThunk( CONTEXT *context, ULONG_PTR unk2, ULONG_PTR unk3, ULONG_PTR unk4 )
|
|
{
|
|
loader_init( context, (void **)&context->Eax );
|
|
TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", (void *)context->Eax, (void *)context->Ebx );
|
|
signal_start_thread( context );
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* process_breakpoint
|
|
*/
|
|
void WINAPI process_breakpoint(void)
|
|
{
|
|
__TRY
|
|
{
|
|
__asm__ volatile("int $3");
|
|
}
|
|
__EXCEPT_ALL
|
|
{
|
|
/* do nothing */
|
|
}
|
|
__ENDTRY
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DbgUiRemoteBreakin (NTDLL.@)
|
|
*/
|
|
void WINAPI DbgUiRemoteBreakin( void *arg )
|
|
{
|
|
if (NtCurrentTeb()->Peb->BeingDebugged)
|
|
{
|
|
__TRY
|
|
{
|
|
DbgBreakPoint();
|
|
}
|
|
__EXCEPT_ALL
|
|
{
|
|
/* do nothing */
|
|
}
|
|
__ENDTRY
|
|
}
|
|
RtlExitUserThread( STATUS_SUCCESS );
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* 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__ */
|