mirror of
https://github.com/reactos/reactos.git
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453 lines
9.2 KiB
ArmAsm
453 lines
9.2 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS CRT
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* FILE: lib/crt/misc/i386/seh.S
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* PURPOSE: SEH Support for the CRT
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include <asm.inc>
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#include <ks386.inc>
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#define DISPOSITION_DISMISS 0
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#define DISPOSITION_CONTINUE_SEARCH 1
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#define DISPOSITION_COLLIDED_UNWIND 3
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#define EXCEPTION_EXIT_UNWIND 4
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#define EXCEPTION_UNWINDING 2
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/* See seh_prolog.s */
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SEH_FRAME_NewEsp = 0 /* 0x00 */
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SEH_FRAME_unused = 4 /* 0x04 */
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SEH_FRAME_PreviousRecord = 8 /* 0x08 */
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SEH_FRAME_Handler = 12 /* 0x0c */
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SEH_FRAME_SEHTable = 16 /* 0x10 */
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SEH_FRAME_Disable = 20 /* 0x14 */
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SEH_FRAME_OriginalEbp = 24 /* 0x18 */
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SEH_FRAME_Size = 28 /* 0x1c */
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EXTERN _RtlUnwind@16:PROC
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/* GLOBALS *******************************************************************/
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PUBLIC __global_unwind2
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PUBLIC __local_unwind2
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PUBLIC __abnormal_termination
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PUBLIC __except_handler2
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PUBLIC __except_handler3
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/* FUNCTIONS *****************************************************************/
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.code
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_unwind_handler:
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/* Check if we were unwinding and continue search if not */
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mov ecx, [esp+4]
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test dword ptr [ecx+4], EXCEPTION_EXIT_UNWIND + EXCEPTION_UNWINDING
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mov eax, DISPOSITION_CONTINUE_SEARCH
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jz unwind_handler_return
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/* We have a collision, do a local unwind */
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mov eax, [esp+20]
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push ebp
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mov ebp, [eax+16]
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mov edx, [eax+40]
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push edx
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mov edx, [eax+36]
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push edx
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call __local_unwind2
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add esp, 8
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pop ebp
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/* Set new try level */
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mov eax, [esp+8]
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mov edx, [esp+16]
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mov [edx], eax
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/* Return collided unwind */
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mov eax, DISPOSITION_COLLIDED_UNWIND
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unwind_handler_return:
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ret
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__global_unwind2:
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/* Create stack and save all registers */
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push ebp
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mov ebp, esp
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push ebx
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push esi
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push edi
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push ebp
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/* Call unwind */
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push 0
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push 0
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push glu_return
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push [ebp+8]
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call _RtlUnwind@16
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glu_return:
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/* Restore registers and return */
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pop ebp
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pop edi
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pop esi
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pop ebx
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mov esp, ebp
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pop ebp
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ret
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__abnormal_termination:
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/* Assume false */
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xor eax, eax
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/* Check if the handler is the unwind handler */
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mov ecx, fs:0
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cmp dword ptr [ecx+4], offset _unwind_handler
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jne short ab_return
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/* Get the try level */
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mov edx, [ecx+12]
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mov edx, [edx+12]
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/* Compare it */
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cmp [ecx+8], edx
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jne ab_return
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/* Return true */
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mov eax, 1
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/* Return */
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ab_return:
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ret
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__local_unwind2:
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/* Save volatiles */
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push ebx
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push esi
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push edi
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/* Get the exception registration */
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mov eax, [esp+16]
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/* Setup SEH to protect the unwind */
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push ebp
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push eax
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push -2
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push offset _unwind_handler
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push fs:0
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mov fs:0, esp
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unwind_loop:
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/* Get the exception registration and try level */
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mov eax, [esp+36]
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mov ebx, [eax+8]
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mov esi, [eax+12]
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/* Validate the unwind */
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cmp esi, -1
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je unwind_return
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cmp dword ptr [esp+40], -1
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je unwind_ok
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cmp esi, [esp+40]
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jbe unwind_return
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unwind_ok:
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/* Get the new enclosing level and save it */
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lea esi, [esi+esi*2]
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mov ecx, [ebx+esi*4]
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mov [esp+8], ecx
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mov [eax+12], ecx
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/* Check the filter type */
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cmp dword ptr [ebx+esi*4+4], 0
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jnz __NLG_Return2
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/* FIXME: NLG Notification */
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/* Call the handler */
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call dword ptr [ebx+esi*4+8]
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__NLG_Return2:
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/* Unwind again */
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jmp unwind_loop
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unwind_return:
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/* Cleanup SEH */
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pop fs:0
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add esp, 16
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pop edi
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pop esi
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pop ebx
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ret
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__except_handler2:
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/* Setup stack and save volatiles */
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push ebp
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mov ebp, esp
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sub esp, 8
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push ebx
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push esi
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push edi
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push ebp
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/* Clear direction flag */
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cld
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/* Get exception registration and record */
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mov ebx, [ebp+12]
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mov eax, [ebp+8]
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/* Check if this is an unwind */
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test dword ptr [eax+4], EXCEPTION_EXIT_UNWIND + EXCEPTION_UNWINDING
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jnz except_unwind2
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/* Save exception pointers structure */
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mov [ebp-8], eax
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mov eax, [ebp+16]
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mov [ebp-4], eax
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lea eax, [ebp-8]
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mov [ebx+20], eax
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/* Get the try level and scope table */
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mov esi, [ebx+12]
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mov edi, [ebx+8]
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except_loop2:
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/* Validate try level */
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cmp esi, -1
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je except_search2
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/* Check if this is the termination handler */
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lea ecx, [esi+esi*2]
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cmp dword ptr [edi+ecx*4+4], 0
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jz except_continue2
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/* Save registers and call filter, then restore them */
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push esi
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push ebp
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mov ebp, [ebx+16]
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call dword ptr [edi+ecx*4+4]
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pop ebp
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pop esi
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/* Restore ebx and check the result */
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mov ebx, [ebp+12]
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or eax, eax
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jz except_continue2
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js except_dismiss2
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/* So this is an accept, call the termination handlers */
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mov edi, [ebx+8]
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push ebx
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call __global_unwind2
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add esp, 4
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/* Restore ebp */
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mov ebp, [ebx+16]
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/* Do local unwind */
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push esi
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push ebx
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call __local_unwind2
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add esp, 8
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/* Set new try level */
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lea ecx, [esi+esi*2]
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mov eax, [edi+ecx*4]
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mov [ebx+12], eax
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/* Call except handler */
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call dword ptr [edi+ecx*4+8]
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except_continue2:
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/* Reload try level and except again */
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mov edi, [ebx+8]
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lea ecx, [esi+esi*2]
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mov esi, [edi+ecx*4]
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jmp except_loop2
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except_dismiss2:
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/* Dismiss it */
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mov eax, DISPOSITION_DISMISS
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jmp except_return2
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except_search2:
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/* Continue searching */
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mov eax, DISPOSITION_CONTINUE_SEARCH
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jmp except_return2
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/* Do local unwind */
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except_unwind2:
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push ebp
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mov ebp, [ebx+16]
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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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/* Retore EBP and set return disposition */
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pop ebp
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mov eax, DISPOSITION_CONTINUE_SEARCH
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except_return2:
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/* Restore registers and stack */
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pop ebp
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pop edi
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pop esi
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pop ebx
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mov esp, ebp
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pop ebp
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ret
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__except_handler3:
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PARAM_ExceptionRecord = 8
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PARAM_RegistrationFrame = 12
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PARAM_Context = 16
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/* Setup stack and save volatiles */
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push ebp
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mov ebp, esp
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sub esp, 8
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push ebx
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push esi
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push edi
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push ebp
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/* Clear direction flag */
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cld
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/* Get exception registration and record */
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mov ebx, [ebp+PARAM_RegistrationFrame]
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mov eax, [ebp+PARAM_ExceptionRecord]
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/* Check if this is an unwind */
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test dword ptr [eax+EXCEPTION_RECORD_EXCEPTION_FLAGS], EXCEPTION_EXIT_UNWIND + EXCEPTION_UNWINDING
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jnz except_unwind3
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/* Save exception pointers structure */
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mov [ebp-8+EXCEPTION_POINTERS_EXCEPTION_RECORD], eax
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mov eax, [ebp+PARAM_Context]
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mov [ebp-8+EXCEPTION_POINTERS_CONTEXT_RECORD], eax
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lea eax, [ebp-8]
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mov [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_unused], eax
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/* Get the try level and scope table */
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mov esi, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_Disable]
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mov edi, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_SEHTable]
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/* FIXME: Validate the SEH exception */
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except_loop3:
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/* Validate try level */
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cmp esi, -1
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je except_search3
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/* Check if this is the termination handler */
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lea ecx, [esi+esi*2]
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mov eax, [edi+ecx*4+4]
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test eax, eax
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jz except_continue3
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/* Save registers clear them all */
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push esi
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push ebp
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lea ebp, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_OriginalEbp]
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xor ebx, ebx
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xor ecx, ecx
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xor edx, edx
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xor esi, esi
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xor edi, edi
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/* Call the filter and restore our registers */
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call eax
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pop ebp
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pop esi
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/* Restore ebx and check the result */
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mov ebx, [ebp+PARAM_RegistrationFrame]
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test eax, eax
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jz except_continue3
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js except_dismiss3
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/* So this is an accept, call the termination handlers */
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mov edi, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_SEHTable]
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push ebx
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call __global_unwind2
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add esp, 4
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/* Restore ebp */
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lea ebp, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_OriginalEbp]
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/* Do local unwind */
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push esi
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push ebx
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call __local_unwind2
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add esp, 8
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/* FIXME: Do NLG Notification */
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/* Set new try level */
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lea ecx, [esi+esi*2]
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mov eax, [edi+ecx*4]
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mov [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_Disable], eax
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/* Clear registers and call except handler */
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mov eax, [edi+ecx*4+8]
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xor ebx, ebx
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xor ecx, ecx
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xor edx, edx
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xor esi, esi
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xor edi, edi
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call eax
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except_continue3:
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/* Reload try level and except again */
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mov edi, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_SEHTable]
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lea ecx, [esi+esi*2]
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mov esi, [edi+ecx*4]
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jmp except_loop3
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except_dismiss3:
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/* Dismiss it */
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mov eax, DISPOSITION_DISMISS
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jmp except_return3
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/* Do local unwind */
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except_unwind3:
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push ebp
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lea ebp, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_OriginalEbp]
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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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/* Restore EBP */
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pop ebp
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except_search3:
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/* Continue searching */
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mov eax, DISPOSITION_CONTINUE_SEARCH
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except_return3:
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/* Restore registers and stack */
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pop ebp
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pop edi
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pop esi
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pop ebx
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mov esp, ebp
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pop ebp
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ret
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END
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