mirror of
https://github.com/reactos/reactos.git
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400 lines
8.7 KiB
ArmAsm
400 lines
8.7 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS Runtime Library (RTL)
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* FILE: lib/rtl/i386/except_asm.s
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* PURPOSE: User-mode exception support for IA-32
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* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
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* Stefan Ginsberg (stefan.ginsberg@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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EXTERN _RtlpCheckForActiveDebugger@0:PROC
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EXTERN _RtlDispatchException@8:PROC
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EXTERN _ZwContinue@8:PROC
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EXTERN _ZwRaiseException@12:PROC
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#define ExceptionContinueSearch 1
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#define ExceptionNestedException 2
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#define ExceptionCollidedUnwind 3
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/* FUNCTIONS *****************************************************************/
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.code
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PUBLIC _RtlpGetExceptionList@0
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_RtlpGetExceptionList@0:
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/* Return the exception list */
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mov eax, fs:[TEB_EXCEPTION_LIST]
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ret
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PUBLIC _RtlpSetExceptionList@4
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_RtlpSetExceptionList@4:
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/* Get the new list */
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mov ecx, [esp+4]
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mov ecx, [ecx]
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/* Write it */
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mov fs:[TEB_EXCEPTION_LIST], ecx
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/* Return */
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ret 4
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PUBLIC _RtlCaptureContext@4
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_RtlCaptureContext@4:
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/* Preserve EBX and put the context in it */
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push ebx
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mov ebx, [esp+8]
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/* Save the basic register context */
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mov [ebx+CONTEXT_EAX], eax
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mov [ebx+CONTEXT_ECX], ecx
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mov [ebx+CONTEXT_EDX], edx
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mov eax, [esp]
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mov [ebx+CONTEXT_EBX], eax
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mov [ebx+CONTEXT_ESI], esi
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mov [ebx+CONTEXT_EDI], edi
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/* Capture the other regs */
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jmp CaptureRest
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PUBLIC _RtlpCaptureContext@4
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_RtlpCaptureContext@4:
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/* Preserve EBX and put the context in it */
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push ebx
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mov ebx, [esp+8]
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/* Clear the basic register context */
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mov dword ptr [ebx+CONTEXT_EAX], 0
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mov dword ptr [ebx+CONTEXT_ECX], 0
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mov dword ptr [ebx+CONTEXT_EDX], 0
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mov dword ptr [ebx+CONTEXT_EBX], 0
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mov dword ptr [ebx+CONTEXT_ESI], 0
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mov dword ptr [ebx+CONTEXT_EDI], 0
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CaptureRest:
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/* Capture the segment registers */
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mov [ebx+CONTEXT_SEGCS], cs
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mov [ebx+CONTEXT_SEGDS], ds
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mov [ebx+CONTEXT_SEGES], es
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mov [ebx+CONTEXT_SEGFS], fs
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mov [ebx+CONTEXT_SEGGS], gs
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mov [ebx+CONTEXT_SEGSS], ss
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/* Capture flags */
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pushfd
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pop [ebx+CONTEXT_EFLAGS]
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/* The return address should be in [ebp+4] */
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mov eax, [ebp+4]
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mov [ebx+CONTEXT_EIP], eax
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/* Get EBP */
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mov eax, [ebp+0]
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mov [ebx+CONTEXT_EBP], eax
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/* And get ESP */
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lea eax, [ebp+8]
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mov [ebx+CONTEXT_ESP], eax
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/* Return to the caller */
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pop ebx
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ret 4
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PUBLIC _RtlpExecuteHandlerForException@20
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_RtlpExecuteHandlerForException@20:
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/* Copy the routine in EDX */
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mov edx, offset _RtlpExceptionProtector
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/* Jump to common routine */
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jmp _RtlpExecuteHandler@20
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PUBLIC _RtlpExecuteHandlerForUnwind@20
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_RtlpExecuteHandlerForUnwind@20:
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/* Copy the routine in EDX */
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mov edx, offset _RtlpUnwindProtector
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.PROC _RtlpExecuteHandler@20
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FPO 0, 0, 0, 0, 0, FRAME_FPO
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/* Save non-volatile */
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push ebx
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push esi
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push edi
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/* Clear registers */
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xor eax, eax
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xor ebx, ebx
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xor esi, esi
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xor edi, edi
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/* Call the 2nd-stage executer */
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push [esp+32]
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push [esp+32]
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push [esp+32]
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push [esp+32]
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push [esp+32]
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call _RtlpExecuteHandler2@20
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/* Restore non-volatile */
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pop edi
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pop esi
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pop ebx
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ret 20
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.ENDP
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PUBLIC _RtlpExecuteHandler2@20
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_RtlpExecuteHandler2@20:
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/* Set up stack frame */
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push ebp
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mov ebp, esp
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/* Save the Frame */
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push [ebp+12]
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/* Push handler address */
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push edx
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/* Push the exception list */
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push [fs:TEB_EXCEPTION_LIST]
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/* Link us to it */
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mov [fs:TEB_EXCEPTION_LIST], esp
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/* Call the handler */
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push [ebp+20]
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push [ebp+16]
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push [ebp+12]
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push [ebp+8]
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mov ecx, [ebp+24]
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call ecx
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/* Unlink us */
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mov esp, [fs:TEB_EXCEPTION_LIST]
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/* Restore it */
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pop [fs:TEB_EXCEPTION_LIST]
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/* Undo stack frame and return */
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mov esp, ebp
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pop ebp
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ret 20
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_RtlpExceptionProtector:
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/* Assume we'll continue */
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mov eax, ExceptionContinueSearch
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/* Put the exception record in ECX and check the Flags */
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mov ecx, [esp+4]
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test dword ptr [ecx+EXCEPTION_RECORD_EXCEPTION_FLAGS], EXCEPTION_UNWINDING + EXCEPTION_EXIT_UNWIND
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jnz return
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/* Save the frame in ECX and Context in EDX */
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mov ecx, [esp+8]
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mov edx, [esp+16]
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/* Get the nested frame */
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mov eax, [ecx+8]
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/* Set it as the dispatcher context */
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mov [edx], eax
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/* Return nested exception */
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mov eax, ExceptionNestedException
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return:
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ret 16
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_RtlpUnwindProtector:
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/* Assume we'll continue */
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mov eax, ExceptionContinueSearch
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/* Put the exception record in ECX and check the Flags */
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mov ecx, [esp+4]
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test dword ptr [ecx+EXCEPTION_RECORD_EXCEPTION_FLAGS], EXCEPTION_UNWINDING + EXCEPTION_EXIT_UNWIND
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jz .return
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/* Save the frame in ECX and Context in EDX */
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mov ecx, [esp+8]
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mov edx, [esp+16]
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/* Get the nested frame */
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mov eax, [ecx+8]
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/* Set it as the dispatcher context */
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mov [edx], eax
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/* Return collided unwind */
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mov eax, ExceptionCollidedUnwind
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.return:
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ret 16
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PUBLIC _RtlRaiseException@4
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_RtlRaiseException@4:
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/* Set up stack frame */
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push ebp
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mov ebp, esp
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/*
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* Save the context while preserving everything but ESP and EBP.
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* This is vital because the caller will be restored with this context
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* in case the execution is continued, which means we must not clobber
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* the non-volatiles. We preserve the volatiles too because the context
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* could get passed to a debugger.
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*/
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lea esp, [esp-CONTEXT_FRAME_LENGTH]
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push esp
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call _RtlCaptureContext@4
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/* Adjust ESP to account for the argument that was passed */
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add dword ptr [esp+CONTEXT_ESP], 4
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/* Save the exception address */
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mov edx, [ebp+4]
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mov eax, [ebp+8]
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mov [eax+EXCEPTION_RECORD_EXCEPTION_ADDRESS], edx
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/* Write the context flag */
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mov dword ptr [esp+CONTEXT_FLAGS], CONTEXT_FULL
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/* Check if user mode debugger is active */
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call _RtlpCheckForActiveDebugger@0
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test al, al
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jnz DebuggerActive1
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/* Dispatch the exception */
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push esp
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push [ebp+8]
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call _RtlDispatchException@8
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test al, al
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jz RaiseException
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/* Continue, go back to previous context */
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mov ecx, esp
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push 0
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push ecx
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call _ZwContinue@8
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jmp RaiseStatus1
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DebuggerActive1:
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/* Raise an exception immediately */
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mov ecx, esp
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push 1
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push ecx
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push [ebp+8]
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call _ZwRaiseException@12
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jmp RaiseStatus1
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RaiseException:
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/* Raise the exception */
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mov ecx, esp
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push 0
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push ecx
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push [ebp+8]
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call _ZwRaiseException@12
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RaiseStatus1:
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/* If we returned, raise a status */
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push eax
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call _RtlRaiseStatus@4
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PUBLIC _RtlRaiseStatus@4
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_RtlRaiseStatus@4:
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/* Set up stack frame */
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push ebp
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mov ebp, esp
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/*
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* Save the context while preserving everything but ESP and EBP.
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* This is vital because the caller will be restored with this context
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* in case the execution is continued, which means we must not clobber
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* the non-volatiles. We preserve the volatiles too because the context
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* could get passed to a debugger.
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*/
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lea esp, [esp-CONTEXT_FRAME_LENGTH-EXCEPTION_RECORD_LENGTH]
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push esp
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call _RtlCaptureContext@4
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/* Adjust ESP to account for the argument that was passed */
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add dword ptr [esp+CONTEXT_ESP], 4
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/* Set up the exception record */
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lea ecx, [esp+CONTEXT_FRAME_LENGTH]
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mov eax, [ebp+8]
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mov dword ptr [ecx+EXCEPTION_RECORD_EXCEPTION_CODE], eax
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mov dword ptr [ecx+EXCEPTION_RECORD_EXCEPTION_FLAGS], EXCEPTION_NONCONTINUABLE
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and dword ptr [ecx+EXCEPTION_RECORD_EXCEPTION_RECORD], 0
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mov eax, [ebp+4]
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mov dword ptr [ecx+EXCEPTION_RECORD_EXCEPTION_ADDRESS], eax
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and dword ptr [ecx+EXCEPTION_RECORD_NUMBER_PARAMETERS], 0
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/* Write the context flag */
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mov dword ptr [esp+CONTEXT_FLAGS], CONTEXT_FULL
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/* Check if user mode debugger is active */
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call _RtlpCheckForActiveDebugger@0
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/* Restore ECX and jump if debugger is active */
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lea ecx, [esp+CONTEXT_FRAME_LENGTH]
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test al, al
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jnz DebuggerActive2
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/* Dispatch the exception */
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push esp
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push ecx
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call _RtlDispatchException@8
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/* Raise exception if we got here */
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lea ecx, [esp+CONTEXT_FRAME_LENGTH]
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mov edx, esp
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push 0
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push edx
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push ecx
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call _ZwRaiseException@12
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jmp RaiseStatus2
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DebuggerActive2:
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/* Raise an exception immediately */
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mov edx, esp
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push 1
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push edx
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push ecx
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call _ZwRaiseException@12
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RaiseStatus2:
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/* If we returned, raise a status */
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push eax
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call _RtlRaiseStatus@4
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END
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