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257 lines
8.7 KiB
257 lines
8.7 KiB
;***
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;exsup2.asm
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;
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; Copyright (c) 1994-2001, Microsoft Corporation. All rights reserved.
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;
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;Purpose:
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; Exception handling for i386. This is just the C8.0 version of
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; the language-specific exception handler. The C9.0 version is
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; found in exsup3.asm, and the routines common to both C8 and C9
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; are found in exsup.asm.
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;
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;Notes:
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;
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;Revision History:
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; 01-10-94 PML Created with __except_handler2 from exsup.asm
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; 01-11-95 SKS Remove MASM 5.X support
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;
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;*******************************************************************************
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;hnt = -D_WIN32 -Dsmall32 -Dflat32 -Mx $this;
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;Define small32 and flat32 since these are not defined in the NT build process
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small32 equ 1
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flat32 equ 1
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.xlist
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include pversion.inc
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?DFDATA = 1
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?NODATA = 1
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include cmacros.inc
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include exsup.inc
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.list
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;REVIEW: can we get rid of _global_unwind2, and just use
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; the C runtimes version, _global_unwind?
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extrn __global_unwind2:near
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extrn __local_unwind2:near
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;typedef struct _EXCEPTION_REGISTRATION PEXCEPTION_REGISTRATION;
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;struct _EXCEPTION_REGISTRATION{
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; struct _EXCEPTION_REGISTRATION *prev;
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; void (*handler)(PEXCEPTION_RECORD, PEXCEPTION_REGISTRATION, PCONTEXT, PEXCEPTION_RECORD);
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; struct scopetable_entry *scopetable;
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; int trylevel;
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; int _ebp;
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; PEXCEPTION_POINTERS xpointers;
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;};
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_C8_EXCEPTION_REGISTRATION struc ; C8.0 version
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dd ? ; prev (common)
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dd ? ; handler (common)
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;private:
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scopetable dd ?
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trylevel dd ?
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_ebp dd ?
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xpointers dd ?
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_C8_EXCEPTION_REGISTRATION ends
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;#define EXCEPTION_MAXIMUM_PARAMETERS 4
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;typedef struct _EXCEPTION_RECORD EXCEPTION_RECORD;
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;typedef EXCEPTION_RECORD *PEXCEPTION_RECORD;
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;struct _EXCEPTION_RECORD{
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; NTSTATUS ExceptionCode;
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; ULONG ExceptionFlags;
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; struct _EXCEPTION_RECORD *ExceptionRecord;
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; PVOID ExceptionAddress;
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; ULONG NumberParameters;
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; ULONG ExceptionInformation[EXCEPTION_MAXIMUM_PARAMETERS];
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;};
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_EXCEPTION_RECORD struc
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exception_number dd ?
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exception_flags dd ?
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exception_record dd ?
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exception_address dd ?
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number_parameters dd ?
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exception_information dd 4 dup(?)
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_EXCEPTION_RECORD ends
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SIZEOF_EXCEPTION_RECORD equ 36
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;/* following is the structure returned by the _exception_info() intrinsic. */
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;typedef struct _EXCEPTION_POINTERS EXCEPTION_POINTERS;
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;typedef struct EXCEPTION_POINTERS *PEXCEPTION_POINTERS;
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;struct _EXCEPTION_POINTERS{
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; PEXCEPTION_RECORD ExceptionRecord;
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; PCONTEXT Context;
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;};
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_EXCEPTION_POINTERS struc
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ep_xrecord dd ?
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ep_context dd ?
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_EXCEPTION_POINTERS ends
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SIZEOF_EXCEPTION_POINTERS equ 8
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assumes DS,DATA
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assumes FS,DATA
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__except_list equ 0
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;struct _SCOPETABLE_ENTRY{
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; int enclosing_level; /* lexical level of enclosing scope */
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; int (*filter)(PEXCEPTION_RECORD); /* NULL for a termination handler */
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; void (*specific_handler)(void); /* xcpt or termination handler */
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;};
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;struct _SCOPETABLE_ENTRY Scopetable[NUMTRYS];
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_SCOPETABLE_ENTRY struc
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enclosing_level dd ?
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filter dd ?
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specific_handler dd ?
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_SCOPETABLE_ENTRY ends
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BeginCODE
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;/* _EXCEPT_HANDLER2 - Try to find an exception handler listed in the scope
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; * table associated with the given registration record, that wants to accept
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; * the current exception. If we find one, run it (and never return).
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; * RETURNS: (*if* it returns)
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; * DISPOSITION_DISMISS - dismiss the exception.
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; * DISPOSITION_CONTINUE_SEARCH - pass the exception up to enclosing handlers
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; */
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;int _except_handler2(
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; PEXCEPTION_RECORD exception_record,
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; PEXCEPTION_REGISTRATION registration,
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; PCONTEXT context,
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; PEXCEPTION_REGISTRATION dispatcher)
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;{
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; int ix, filter_result;
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;
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; for(ix=registration->trylevel; ix!=-1; ix=registration->xscope[ix].enclosing_level){
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; /* if filter==NULL, then this is an entry for a termination handler */
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; if(registration->xscope[ix].filter){
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; /* NB: call to the filter may trash the callee save
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; registers. (this is *not* a standard cdecl function) */
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; filter_result=(*registration->xscope[ix].filter)(xinfo);
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; if(filter_result==FILTER_DISMISS)
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; return(-1); /* dismiss */
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; if(filter_result==FILTER_ACCEPT){
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; _global_unwind2(registration);
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; _local_unwind2(registration, ix);
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; (*registration->xscope[ix].specific_handler)(void);
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; assert(UNREACHED); /*should never return from handler*/
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; }
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; assert(filter_result==FILTER_CONTINUE_SEARCH);
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; }
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; }
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; return(0); /* didnt find one */
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;}
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db 'VC10' ;; VC/C++ 1.0/32-bit (C8.0) version
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db 'XC00' ;; so debugger can recognize this proc (cuda:3936)
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cProc _except_handler2,<C,PUBLIC>,<IBX,ISI,IDI,IBP>
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parmDP xrecord
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parmDP registration
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parmDP context
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parmDP dispatcher
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localV xp,SIZEOF_EXCEPTION_POINTERS
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cBegin
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;4*4b for callee saves + 4b return address + 4b param = 24
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;DF in indeterminate state at time of exception, so clear it
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cld
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mov ebx, registration ;ebx= PEXCEPTION_REGISTRATION
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mov eax, xrecord
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test [eax.exception_flags], EXCEPTION_UNWIND_CONTEXT
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jnz short _lh_unwinding
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;build the EXCEPTION_POINTERS locally store its address in the
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; registration record. this is the pointer that is returned by
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; the _eception_info intrinsic.
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mov xp.ep_xrecord, eax
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mov eax, context
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mov xp.ep_context, eax
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lea eax, xp
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mov [ebx.xpointers], eax
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mov esi, [ebx.trylevel] ;esi= try level
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mov edi, [ebx.scopetable] ;edi= scope table base
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_lh_top:
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cmp esi, -1
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je short _lh_bagit
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lea ecx, [esi+esi*2] ;ecx= trylevel*3
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cmp dword ptr [(edi+ecx*4).filter], 0
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je short _lh_continue ;term handler, so keep looking
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;filter may trash *all* registers, so save ebp and scopetable offset
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push esi
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push ebp
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mov ebp, [ebx._ebp]
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call [(edi+ecx*4).filter] ;call the filter
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pop ebp
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pop esi
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;ebx may have been trashed by the filter, so we must reload
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mov ebx, registration
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; Accept <0, 0, >0 instead of just -1, 0, +1
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or eax, eax
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jz short _lh_continue
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js short _lh_dismiss
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;assert(eax==FILTER_ACCEPT)
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;reload xscope base, cuz it was trashed by the filter call
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mov edi, [ebx.scopetable]
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;load handler address before we loose components of address mode
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push ebx ;registration*
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call __global_unwind2 ;run term handlers
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add esp, 4
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;setup ebp for the local unwinder and the specific handler
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mov ebp, [ebx._ebp]
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;the stop try level == accepting except level
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push esi ;stop try level
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push ebx ;registration*
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call __local_unwind2
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add esp, 8
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lea ecx, [esi+esi*2] ;ecx=trylevel*3
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; set the current trylevel to our enclosing level immediately
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; before giving control to the handler. it is the enclosing
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; level, if any, that guards the handler.
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mov eax, [(edi+ecx*4).enclosing_level]
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mov [ebx.trylevel], eax
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call [(edi+ecx*4).specific_handler] ;call the except handler
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;assert(0) ;(NB! should not return)
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_lh_continue:
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;reload the scope table base, possibly trashed by call to filter
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mov edi, [ebx.scopetable]
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lea ecx, [esi+esi*2]
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mov esi, [edi+ecx*4+0] ;load the enclosing trylevel
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jmp short _lh_top
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_lh_dismiss:
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mov eax, DISPOSITION_DISMISS ;dismiss the exception
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jmp short _lh_return
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_lh_bagit:
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mov eax, DISPOSITION_CONTINUE_SEARCH
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jmp short _lh_return
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_lh_unwinding:
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push ebp
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mov ebp, [ebx._ebp]
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push -1
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push ebx
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call __local_unwind2
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add esp, 8
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pop ebp
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;the return value is not really relevent in an unwind context
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mov eax, DISPOSITION_CONTINUE_SEARCH
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_lh_return:
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cEnd
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EndCODE
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END
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