109 lines
2.7 KiB
NASM
109 lines
2.7 KiB
NASM
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;***
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;setjmp.asm
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;
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; Copyright (C) 1993-2001, Microsoft Corporation. All rights reserved.
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;
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;Purpose:
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; Contains setjmp();
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; split from exsup.asm for granularity purposes.
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;
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;Notes:
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;
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;Revision History:
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; 04-13-93 JWM Module created.
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; 10-14-93 GJF Merged in NT verson.
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; 01-12-94 PML Added C9.0 generic EH callback for unwind. Split
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; into setjmp.asm, setjmp3.asm, and longjmp.asm.
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; 02-10-94 GJF -1 is the end-of-exception-handler chain marker, not 0.
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; 01-11-95 GJF Purged raisex(). Nobody uses it. Nobody even remembers
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; what it was used for (it was part of the test harness
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; for early EH unit testing).
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; 01-11-95 SKS Remove MASM 5.X support
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; 01-13-95 JWM Added NLG routines for debugger support.
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; 04-11-95 JWM NLG_Return moved to lowhelpr.asm.
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; 04-21-95 JWM NLG routines moved to exsup.asm.
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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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assumes DS,DATA
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assumes FS,DATA
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BeginCODE
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; Following symbol defined in exsup.asm
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extrn __except_list:near
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; int
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; _setjmp (
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; OUT jmp_buf env)
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;
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; Routine Description:
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;
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; (Old) implementation of setjmp intrinsic. Saves the current
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; nonvolatile register state in the specified jump buffer and returns
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; a function value of zero.
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;
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; Saves the callee-save registers, stack pointer and return address.
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; Also saves the exception registration list head.
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;
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; This code is only present for old apps that link to the DLL runtimes,
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; or old object files compiles with C8.0. It intentionally duplicates
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; the old setjmp bugs, blindly assuming that the topmost EH node is a
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; C8.0 SEH node.
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;
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; Arguments:
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;
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; env - Address of the buffer for storing the state information
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;
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; Return Value:
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;
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; A value of zero is returned.
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public __setjmp
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__setjmp PROC NEAR
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mov edx, [esp+4]
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mov [edx.saved_ebp], ebp ; old bp and the rest
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mov [edx.saved_ebx], ebx
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mov [edx.saved_edi], edi
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mov [edx.saved_esi], esi
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mov [edx.saved_esp], esp
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mov eax, [esp] ; return address
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mov [edx.saved_return], eax
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mov eax, dword ptr fs:__except_list
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mov [edx.saved_xregistration], eax
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cmp eax, -1 ; -1 means no higher-level handler
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jnz short _sj_save_trylevel
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mov dword ptr [edx.saved_trylevel], -1 ;something invalid
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jmp short _sj_done
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_sj_save_trylevel:
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mov eax, [eax + C8_TRYLEVEL]
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mov [edx.saved_trylevel], eax
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_sj_done:
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sub eax, eax
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ret
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__setjmp ENDP
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EndCODE
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END
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