From 03d84cb5088108ff30dd82155c76217d36ee2655 Mon Sep 17 00:00:00 2001 From: Alex Ionescu Date: Sun, 12 Nov 2006 22:43:43 +0000 Subject: [PATCH] - Move out SEH-support routines from ntoskrnl/rtl to lib/rtl - Re-implement the routines in intel syntax and also cleanup the formatting. - Also re-implement the way the routines work, by following Matt Pietrek's c code that he wrote in one of his articles after looking at the disassembly. - Also used a patch for mingw found on Google which contained some implementations in C. - New changes mostly add protection during unwinding, faster speed, and add implementations for __except_handler2 and _abnormal_termination which were not previously present. svn path=/trunk/; revision=24736 --- reactos/lib/rtl/i386/except_asm.s | 7 +- reactos/lib/rtl/i386/seh.s | 468 ++++++++++++++++++++++++++ reactos/lib/rtl/rtl.rbuild | 1 + reactos/ntoskrnl/ntoskrnl.rbuild | 6 - reactos/ntoskrnl/rtl/i386/exception.c | 75 ----- reactos/ntoskrnl/rtl/i386/seh.s | 377 --------------------- 6 files changed, 472 insertions(+), 462 deletions(-) create mode 100644 reactos/lib/rtl/i386/seh.s delete mode 100755 reactos/ntoskrnl/rtl/i386/exception.c delete mode 100755 reactos/ntoskrnl/rtl/i386/seh.s diff --git a/reactos/lib/rtl/i386/except_asm.s b/reactos/lib/rtl/i386/except_asm.s index d8683822444..0c0f0a7104f 100644 --- a/reactos/lib/rtl/i386/except_asm.s +++ b/reactos/lib/rtl/i386/except_asm.s @@ -1,10 +1,9 @@ /* * COPYRIGHT: See COPYING in the top level directory - * PROJECT: ReactOS NT Library - * FILE: lib/rtl/i386/except.S + * PROJECT: ReactOS Runtime Library (RTL) + * FILE: lib/rtl/i386/except_asm.S * PURPOSE: User-mode exception support for IA-32 * PROGRAMMERS: Alex Ionescu (alex@relsoft.net) - * Casper S. Hornstrup (chorns@users.sourceforge.net) */ /* INCLUDES ******************************************************************/ @@ -16,7 +15,7 @@ #define ExceptionNestedException 2 #define ExceptionCollidedUnwind 3 -/* FUNCTIONS ****************************************************************/ +/* FUNCTIONS *****************************************************************/ .func RtlpGetExceptionList@0 .globl _RtlpGetExceptionList@0 diff --git a/reactos/lib/rtl/i386/seh.s b/reactos/lib/rtl/i386/seh.s new file mode 100644 index 00000000000..5b2bc36a9b8 --- /dev/null +++ b/reactos/lib/rtl/i386/seh.s @@ -0,0 +1,468 @@ +/* + * COPYRIGHT: See COPYING in the top level directory + * PROJECT: ReactOS CRT + * FILE: lib/crt/misc/i386/seh.S + * PURPOSE: SEH Support for the CRT + * PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org) + */ + +/* INCLUDES ******************************************************************/ + +#include +.intel_syntax noprefix + +#define DISPOSITION_DISMISS 0 +#define DISPOSITION_CONTINUE_SEARCH 1 +#define DISPOSITION_COLLIDED_UNWIND 3 + +/* GLOBALS *******************************************************************/ + +.globl __global_unwind2 +.globl __local_unwind2 +.globl __abnormal_termination +.globl __except_handler2 +.globl __except_handler3 + +/* FUNCTIONS *****************************************************************/ + +.func unwind_handler +_unwind_handler: + + /* Check if we were unwinding and continue search if not */ + mov ecx, [esp+4] + test dword ptr [ecx+4], EXCEPTION_EXIT_UNWIND + EXCEPTION_UNWINDING + mov eax, DISPOSITION_CONTINUE_SEARCH + jz unwind_handler_return + + /* We have a collision, do a local unwind */ + mov eax, [esp+20] + push ebp + mov ebp, [eax+16] + mov edx, [eax+40] + push edx + mov edx, [eax+36] + push edx + call __local_unwind2 + add esp, 8 + pop ebp + + /* Set new try level */ + mov eax, [esp+8] + mov edx, [esp+16] + mov [edx], eax + + /* Return collided unwind */ + mov eax, DISPOSITION_COLLIDED_UNWIND + +unwind_handler_return: + ret +.endfunc + +.func _global_unwind2 +__global_unwind2: + + /* Create stack and save all registers */ + push ebp + mov ebp, esp + push ebx + push esi + push edi + push ebp + + /* Call unwind */ + push 0 + push 0 + push glu_return + push [ebp+8] + call _RtlUnwind@16 + +glu_return: + /* Restore registers and return */ + pop ebp + pop esi + pop edi + pop ebx + mov esp, ebp + pop ebp + ret +.endfunc + +.func _abnormal_termination +__abnormal_termination: + + /* Assume false */ + xor eax, eax + + /* Check if the handler is the unwind handler */ + mov ecx, fs:0 + cmp dword ptr [ecx+4], offset _unwind_handler + jne short ab_return + + /* Get the try level */ + mov edx, [ecx+12] + mov edx, [edx+12] + + /* Compare it */ + cmp [ecx+8], edx + jne ab_return + + /* Return true */ + mov eax, 1 + + /* Return */ +ab_return: + ret +.endfunc + +.func _local_unwind2 +__local_unwind2: + + /* Save volatiles */ + push ebx + push esi + push edi + + /* Get the exception registration */ + mov eax, [esp+16] + + /* Setup SEH to protect the unwind */ + push ebp + push eax + push -2 + push offset _unwind_handler + push fs:0 + mov fs:0, esp + +unwind_loop: + /* Get the exception registration and try level */ + mov eax, [esp+36] + mov ebx, [eax+8] + mov esi, [eax+12] + + /* Validate the unwind */ + cmp esi, -1 + je unwind_return + cmp dword ptr [esp+40], -1 + je unwind_ok + cmp esi, [esp+40] + jbe unwind_return + +unwind_ok: + /* Get the new enclosing level and save it */ + lea esi, [esi+esi*2] + mov ecx, [ebx+esi*4] + mov [esp+8], ecx + mov [eax+12], ecx + + /* Check the filter type */ + cmp dword ptr [ebx+esi*4+4], 0 + jnz __NLG_Return2 + + /* FIXME: NLG Notification */ + + /* Call the handler */ + call dword ptr [ebx+esi*4+8] + +__NLG_Return2: + /* Unwind again */ + jmp unwind_loop + +unwind_return: + /* Cleanup SEH */ + pop fs:0 + add esp, 16 + pop edi + pop esi + pop ebx + ret +.endfunc + +.func _except_handler2 +__except_handler2: + + /* Setup stack and save volatiles */ + push ebp + mov ebp, esp + sub esp, 8 + push ebx + push esi + push edi + push ebp + + /* Clear direction flag */ + cld + + /* Get exception registration and record */ + mov ebx, [ebp+12] + mov eax, [ebp+8] + + /* Check if this is an unwind */ + test dword ptr [eax+4], EXCEPTION_EXIT_UNWIND + EXCEPTION_UNWINDING + jnz except_unwind2 + + /* Save exception pointers structure */ + mov [ebp-8], eax + mov eax, [ebp+16] + mov [ebp-4], eax + lea eax, [ebp-8] + mov [ebx+20], eax + + /* Get the try level and scope table */ + mov esi, [ebx+12] + mov esi, [ebx+8] + +except_loop2: + /* Validate try level */ + cmp esi, -1 + je except_search2 + + /* Check if this is the termination handler */ + lea ecx, [esi+esi*2] + cmp dword ptr [edi+ecx*4+4], 0 + jz except_continue2 + + /* Save registers and call filter, then restore them */ + push esi + push ebp + mov ebp, [ebx+16] + call dword ptr [edi+ecx*4+4] + pop ebp + pop esi + + /* Restore ebx and check the result */ + mov ebx, [ebp+12] + or eax, eax + jz except_continue2 + jz except_dismiss2 + + /* So this is an accept, call the termination handlers */ + mov edi, [ebx+8] + push ebx + call __global_unwind2 + add esp, 4 + + /* Restore ebp */ + mov ebp, [ebx+16] + + /* Do local unwind */ + push esi + push ebx + call __local_unwind2 + add esp, 8 + + /* Set new try level */ + lea ecx, [esi+esi*2] + mov eax, [edi+ecx*4] + mov [ebx+12], eax + + /* Call except handler */ + call [edi+ecx*4+8] + +except_continue2: + /* Reload try level and except again */ + mov edi, [ebx+8] + lea ecx, [esi+esi*2] + mov esi, [edi+ecx*4] + jmp except_loop2 + +except_dismiss2: + /* Dismiss it */ + mov eax, DISPOSITION_DISMISS + jmp except_return2 + +except_search2: + /* Continue searching */ + mov eax, DISPOSITION_CONTINUE_SEARCH + jmp except_return2 + + /* Do local unwind */ +except_unwind2: + push ebp + mov ebp, [ebx+16] + push -1 + push ebx + call __local_unwind2 + add esp, 8 + + /* Retore EBP and set return disposition */ + pop ebp + mov eax, DISPOSITION_CONTINUE_SEARCH + +except_return2: + /* Restore registers and stack */ + pop ebp + pop edi + pop esi + pop ebx + mov esp, ebp + pop ebp + ret +.endfunc + +.func _except_handler3 +__except_handler3: + + /* Setup stack and save volatiles */ + push ebp + mov ebp, esp + sub esp, 8 + push ebx + push esi + push edi + push ebp + + /* Clear direction flag */ + cld + + /* Get exception registration and record */ + mov ebx, [ebp+12] + mov eax, [ebp+8] + + /* Check if this is an unwind */ + test dword ptr [eax+4], EXCEPTION_EXIT_UNWIND + EXCEPTION_UNWINDING + jnz except_unwind3 + + /* Save exception pointers structure */ + mov [ebp-8], eax + mov eax, [ebp+16] + mov [ebp-4], eax + lea eax, [ebp-8] + mov [ebx-4], eax + + /* Get the try level and scope table */ + mov esi, [ebx+12] + mov esi, [ebx+8] + + /* FIXME: Validate the SEH exception */ + +except_loop3: + /* Validate try level */ + cmp esi, -1 + je except_search3 + + /* Check if this is the termination handler */ + lea ecx, [esi+esi*2] + mov eax, [edi+ecx*4+4] + or eax, eax + jz except_continue3 + + /* Save registers clear them all */ + push esi + push ebp + lea ebp, [ebx+16] + xor ebx, ebx + xor ecx, ecx + xor edx, edx + xor esi, esi + xor edi, edi + + /* Call the filter and restore our registers */ + call eax + pop ebp + pop esi + + /* Restore ebx and check the result */ + mov ebx, [ebp+12] + or eax, eax + jz except_continue3 + jz except_dismiss3 + + /* So this is an accept, call the termination handlers */ + mov edi, [ebx+8] + push ebx + call __global_unwind2 + add esp, 4 + + /* Restore ebp */ + lea ebp, [ebx+16] + + /* Do local unwind */ + push esi + push ebx + call __local_unwind2 + add esp, 8 + + /* FIXME: Do NLG Notification */ + + /* Set new try level */ + lea ecx, [esi+esi*2] + mov eax, [edi+ecx*4] + mov [ebx+12], eax + + /* Clear registers and call except handler */ + mov eax, [edi+ecx*4+8] + xor ebx, ebx + xor ecx, ecx + xor edx, edx + xor esi, esi + xor edi, edi + call eax + +except_continue3: + /* Reload try level and except again */ + mov edi, [ebx+8] + lea ecx, [esi+esi*2] + mov esi, [edi+ecx*4] + jmp except_loop3 + +except_dismiss3: + /* Dismiss it */ + mov eax, DISPOSITION_DISMISS + jmp except_return3 + +except_search3: + /* Continue searching */ + mov eax, DISPOSITION_CONTINUE_SEARCH + jmp except_return3 + + /* Do local unwind */ +except_unwind3: + push ebp + mov ebp, [ebx+16] + push -1 + push ebx + call __local_unwind2 + add esp, 8 + + /* Retore EBP and set return disposition */ + pop ebp + mov eax, DISPOSITION_CONTINUE_SEARCH + +except_return3: + /* Restore registers and stack */ + pop ebp + pop edi + pop esi + pop ebx + mov esp, ebp + pop ebp + ret +.endfunc + +// +// +// REMOVE ME REMOVE ME REMOVE ME REMOVE ME REMOVE ME REMOVE ME REMOVE ME +// +// +.func RtlpGetStackLimits@8 +.globl _RtlpGetStackLimits@8 +_RtlpGetStackLimits@8: + + /* Get the current thread */ + mov eax, [fs:KPCR_CURRENT_THREAD] + + /* Get the stack limits */ + mov ecx, [eax+KTHREAD_STACK_LIMIT] + mov edx, [eax+KTHREAD_INITIAL_STACK] + sub edx, SIZEOF_FX_SAVE_AREA + + /* Return them */ + mov eax, [esp+4] + mov [eax], ecx + + mov eax, [esp+8] + mov [eax], edx + + /* return */ + ret 8 +.endfunc diff --git a/reactos/lib/rtl/rtl.rbuild b/reactos/lib/rtl/rtl.rbuild index 0cf9d474145..29f568e05d4 100644 --- a/reactos/lib/rtl/rtl.rbuild +++ b/reactos/lib/rtl/rtl.rbuild @@ -35,6 +35,7 @@ rtlmem.s pow_asm.s res_asm.s + seh.s sin_asm.s sqrt_asm.s tan_asm.s diff --git a/reactos/ntoskrnl/ntoskrnl.rbuild b/reactos/ntoskrnl/ntoskrnl.rbuild index 3a7c86ef22d..8856ad9fa9a 100644 --- a/reactos/ntoskrnl/ntoskrnl.rbuild +++ b/reactos/ntoskrnl/ntoskrnl.rbuild @@ -326,12 +326,6 @@ win32.c - - - exception.c - seh.s - - libsupp.c misc.c strtok.c diff --git a/reactos/ntoskrnl/rtl/i386/exception.c b/reactos/ntoskrnl/rtl/i386/exception.c deleted file mode 100755 index f87e6cca773..00000000000 --- a/reactos/ntoskrnl/rtl/i386/exception.c +++ /dev/null @@ -1,75 +0,0 @@ -/* $Id$ - * - * COPYRIGHT: See COPYING in the top level directory - * PROJECT: ReactOS kernel - * FILE: ntoskrnl/rtl/i386/exception.c - * PURPOSE: Kernel-mode exception support for IA-32 - * - * PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net) - */ - -/* INCLUDES *****************************************************************/ - -#include - -#define NDEBUG -#include - -/* FUNCTIONS ***************************************************************/ - -#if 1 -VOID STDCALL -MsvcrtDebug(ULONG Value) -{ - DbgPrint("KernelDebug 0x%.08x\n", Value); -} -#endif - -#if !defined(_MSC_VER) -/* - * When compiling this file with MSVC itself, don't compile these functions. - * They are replacements for MS compiler and/or C runtime library functions, - * which are already provided by the MSVC compiler and C runtime library. - */ - -/* - * @implemented - */ -int -_abnormal_termination(void) -{ - DbgPrint("Abnormal Termination\n"); - return 0; -} - -struct _CONTEXT; - -/* - * @implemented - */ -EXCEPTION_DISPOSITION -_except_handler2( - struct _EXCEPTION_RECORD *ExceptionRecord, - void *RegistrationFrame, - struct _CONTEXT *ContextRecord, - void *DispatcherContext) -{ - DbgPrint("_except_handler2()\n"); - return (EXCEPTION_DISPOSITION)0; -} - -/* - * @implemented - */ -void __cdecl -_global_unwind2(PEXCEPTION_REGISTRATION_RECORD RegistrationFrame) -{ - RtlUnwind(RegistrationFrame, &&__ret_label, NULL, 0); -__ret_label: - // return is important - return; -} - -#endif /* _MSC_VER */ - -/* EOF */ diff --git a/reactos/ntoskrnl/rtl/i386/seh.s b/reactos/ntoskrnl/rtl/i386/seh.s deleted file mode 100755 index 584fcf1556b..00000000000 --- a/reactos/ntoskrnl/rtl/i386/seh.s +++ /dev/null @@ -1,377 +0,0 @@ -/* $Id$ - * - * COPYRIGHT: See COPYING in the top level directory - * PROJECT: ReactOS kernel - * PURPOSE: Runtime library exception support for IA-32 - * FILE: ntoskrnl/rtl/i386/seh.s - * PROGRAMER: Casper S. Hornstrup (chorns@users.sourceforge.net) - * NOTES: This file is shared with lib/msvcrt/except/seh.s. - * Please keep them in sync. - */ - -#include - -#define ExceptionContinueExecution 0 -#define ExceptionContinueSearch 1 -#define ExceptionNestedException 2 -#define ExceptionCollidedUnwind 3 - -#define EREC_CODE 0x00 -#define EREC_FLAGS 0x04 -#define EREC_RECORD 0x08 -#define EREC_ADDRESS 0x0C -#define EREC_NUMPARAMS 0x10 -#define EREC_INFO 0x14 - -#define TRYLEVEL_NONE -1 -#define TRYLEVEL_INVALID -2 - -#define ER_STANDARDESP -0x08 -#define ER_EPOINTERS -0x04 -#define ER_PREVFRAME 0x00 -#define ER_HANDLER 0x04 -#define ER_SCOPETABLE 0x08 -#define ER_TRYLEVEL 0x0C -#define ER_EBP 0x10 - -#define ST_TRYLEVEL 0x00 -#define ST_FILTER 0x04 -#define ST_HANDLER 0x08 - -#define CONTEXT_EDI 0x9C -#define CONTEXT_EBX 0xA4 -#define CONTEXT_EIP 0xB8 - -.globl __local_unwind2 -.globl __except_handler3 - -// EAX = value to print -_do_debug: - pushal - pushl %eax - call _MsvcrtDebug@4 - popal - ret - -#define LU2_TRYLEVEL 0x08 -#define LU2_REGFRAME 0x04 - -// -// void -// _local_unwind2(PEXCEPTION_REGISTRATION RegistrationFrame, -// LONG TryLevel) -// -// Parameters: -// [EDX+08h] - PEXCEPTION_REGISTRATION RegistrationFrame -// [EDX+04h] - LONG TryLevel -// Registers: -// EBP - EBP of call frame we are unwinding -// Returns: -// Nothing -// Notes: -// Run all termination handlers for a call frame from the current -// try-level up to (but not including) the given stop try-level. -__local_unwind2: - // Setup our call frame so we can access parameters using EDX - //pushl %ebp - movl %esp, %edx - - // FIXME: Setup an EXCEPTION_REGISTRATION entry to protect the - // unwinding in case something goes wrong - -.lu2_next_scope: - - // Keep a pointer to the exception registration in EBX - movl LU2_REGFRAME(%edx), %ebx - - // If we have reached the end of the chain or we're asked to stop here - // by the caller then exit - movl ER_TRYLEVEL(%ebx), %eax - - cmpl $-1, %eax - je .lu2_done - - cmpl LU2_TRYLEVEL(%edx), %eax - je .lu2_done - - // Keep a pointer to the scopetable in ESI - movl ER_SCOPETABLE(%ebx), %esi - - // Compute the offset of the entry in the scopetable that describes - // the scope that is to be unwound. Put the offset in EDI. - movl ST_TRYLEVEL(%esi), %edi - lea (%edi, %edi, 2), %edi - shll $2, %edi - addl %esi, %edi - - // If this is not a termination handler then skip it - cmpl $0, ST_FILTER(%edi) - jne .lu2_next_scope - - // Save the previous try-level in the exception registration structure - movl ST_TRYLEVEL(%edi), %eax - movl %eax, ER_TRYLEVEL(%ebx) - - // Fetch the address of the termination handler - movl ST_HANDLER(%edi), %eax - - // Termination handlers may trash all registers so save the - // important ones and then call the handler - pushl %edx - call *%eax - - // Get our base pointer back - popl %edx - - jmp .lu2_next_scope - -.lu2_done: - - // FIXME: Tear down the EXCEPTION_REGISTRATION entry setup to protect - // the unwinding - - //movl %esi, %esp - //popl %ebp - ret - -#define EH3_DISPCONTEXT 0x14 -#define EH3_CONTEXT 0x10 -#define EH3_REGFRAME 0x0C -#define EH3_ERECORD 0x08 - -// Parameters: -// [ESP+14h] - PVOID DispatcherContext -// [ESP+10h] - PCONTEXT Context -// [ESP+0Ch] - PEXCEPTION_REGISTRATION RegistrationFrame -// [ESP+08h] - PEXCEPTION_RECORD ExceptionRecord -// Registers: -// Unknown -// Returns: -// EXCEPTION_DISPOSITION - How this handler handled the exception -// Notes: -// Try to find an exception handler that will handle the exception. -// Traverse the entries in the scopetable that is associated with the -// exception registration passed as a parameter to this function. -// If an exception handler that will handle the exception is found, it -// is called and this function never returns -__except_handler3: - // Setup our call frame so we can access parameters using EBP - pushl %ebp // Standard ESP in frame (considered part of EXCEPTION_REGISTRATION) - movl %esp, %ebp - - // Don't trust the direction flag to be cleared - cld - - // Either we're called to handle an exception or we're called to unwind - movl EH3_ERECORD(%ebp), %eax - testl $EXCEPTION_UNWIND, EREC_FLAGS(%eax) - jnz .eh3_unwind - - // Keep a pointer to the exception registration in EBX - movl EH3_REGFRAME(%ebp), %ebx - - // Build an EXCEPTION_POINTERS structure on the stack and store it's - // address in the EXCEPTION_REGISTRATION structure - movl EH3_CONTEXT(%esp), %eax - pushl %ebx // Registration frame - pushl %eax // Context - movl %esp, ER_EPOINTERS(%ebx) // Pointer to EXCEPTION_REGISTRATION on the stack - - // Keep current try-level in EDI - movl ER_TRYLEVEL(%ebx), %edi - - // Keep a pointer to the scopetable in ESI - movl ER_SCOPETABLE(%ebx), %esi - -.eh3_next_scope: - - // If we have reached the end of the chain then exit - cmpl $-1, %edi - je .eh3_search - - // Compute the offset of the entry in the scopetable and store - // the absolute address in EAX - lea (%edi, %edi, 2), %eax - shll $2, %eax - addl %esi, %eax - - // Fetch the address of the filter routine - movl ST_FILTER(%eax), %eax - - // If this is a termination handler then skip it - cmpl $0, %eax - je .eh3_continue - - // Filter routines may trash all registers so save the important - // ones before restoring the call frame ebp and calling the handler - pushl %ebp - pushl %edi // Stop try-level - lea ER_EBP(%ebx), %ebp - call *%eax - popl %edi // Stop try-level - popl %ebp - - // Reload EBX with registration frame address - movl EH3_REGFRAME(%ebp), %ebx - - // Be more flexible here by checking if the return value is less than - // zero, equal to zero, or larger than zero instead of the defined - // values: - // -1 (EXCEPTION_CONTINUE_EXECUTION) - // 0 (EXCEPTION_CONTINUE_SEARCH) - // +1 (EXCEPTION_EXECUTE_HANDLER) - orl %eax, %eax - jz .eh3_continue - js .eh3_dismiss - - // Filter returned: EXCEPTION_EXECUTE_HANDLER - - // Ask the OS to perform global unwinding. - pushl %edi // Save stop try-level - pushl %ebx // Save registration frame address - pushl %ebx // Registration frame address - call __global_unwind2 - popl %eax // Remove parameter to __global_unwind2 - popl %ebx // Restore registration frame address - popl %edi // Restore stop try-level - - // Change the context structure so _except_finish is called in the - // correct context since we return ExceptionContinueExecution. - movl EH3_CONTEXT(%ebp), %eax - - movl %edi, CONTEXT_EDI(%eax) // Stop try-level - movl %ebx, CONTEXT_EBX(%eax) // Registration frame address - movl $_except_finish, CONTEXT_EIP(%eax) - - movl $ExceptionContinueExecution, %eax - jmp .eh3_return - - // Filter returned: EXCEPTION_CONTINUE_SEARCH -.eh3_continue: - - // Reload ESI because the filter routine may have trashed it - movl ER_SCOPETABLE(%ebx), %esi - - // Go one try-level closer to the top - lea (%edi, %edi, 2), %edi - shll $2, %edi - addl %esi, %edi - movl ST_TRYLEVEL(%edi), %edi - - jmp .eh3_next_scope - - // Filter returned: EXCEPTION_CONTINUE_EXECUTION - // Continue execution like nothing happened -.eh3_dismiss: - movl $ExceptionContinueExecution, %eax - jmp .eh3_return - - // Tell the OS to search for another handler that will handle the exception -.eh3_search: - - movl $ExceptionContinueSearch, %eax - jmp .eh3_return - - // Perform local unwinding -.eh3_unwind: - - movl $ExceptionContinueSearch, %eax - testl $EXCEPTION_TARGET_UNWIND, EREC_FLAGS(%eax) - jnz .eh3_return - - // Save some important registers - pushl %ebp - - lea ER_EBP(%ebx), %ebp - pushl $-1 - pushl %ebx - call __local_unwind2 - addl $8, %esp - - // Restore some important registers - popl %ebp - - movl $ExceptionContinueSearch, %eax - - // Get me out of here -.eh3_return: - - movl %ebp, %esp - popl %ebp - ret - -// Parameters: -// None -// Registers: -// EBX - Pointer to exception registration structure -// EDI - Stop try-level -// Returns: -// - -// Notes: -// - -_except_finish: - - // Setup EBP for the exception handler. By doing this the exception - // handler can access local variables as normal - lea ER_EBP(%ebx), %ebp - - // Save some important registers - pushl %ebp - pushl %ebx - pushl %edi - - // Stop try-level - pushl %edi - - // Pointer to exception registration structure - pushl %ebx - call __local_unwind2 - addl $8, %esp - - // Restore some important registers - popl %edi - popl %ebx - popl %ebp - - // Keep a pointer to the scopetable in ESI - movl ER_SCOPETABLE(%ebx), %esi - - // Compute the offset of the entry in the scopetable and store - // the absolute address in EDI - lea (%edi, %edi, 2), %edi - shll $2, %edi - addl %esi, %edi - - // Set the current try-level to the previous try-level and call - // the exception handler - movl ST_TRYLEVEL(%edi), %eax - movl %eax, ER_TRYLEVEL(%ebx) - movl ST_HANDLER(%edi), %eax - - call *%eax - - // We should never get here - ret - -.intel_syntax noprefix -.globl _RtlpGetStackLimits@8 -_RtlpGetStackLimits@8: - - /* Get the current thread */ - mov eax, [fs:KPCR_CURRENT_THREAD] - - /* Get the stack limits */ - mov ecx, [eax+KTHREAD_STACK_LIMIT] - mov edx, [eax+KTHREAD_INITIAL_STACK] - sub edx, SIZEOF_FX_SAVE_AREA - - /* Return them */ - mov eax, [esp+4] - mov [eax], ecx - - mov eax, [esp+8] - mov [eax], edx - - /* return */ - ret 8 -