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- Make _except_handler3 human-readable
CORE-12283

svn path=/trunk/; revision=73145
This commit is contained in:
Thomas Faber 2016-11-05 18:33:50 +00:00
parent 7eea8b9401
commit 2c8f2ae901
1 changed files with 36 additions and 25 deletions
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61
reactos/sdk/lib/pseh/i386/seh.s
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@ -9,6 +9,7 @@
/* INCLUDES ******************************************************************/ /* INCLUDES ******************************************************************/
#include <asm.inc> #include <asm.inc>
#include <ks386.inc>
#define DISPOSITION_DISMISS 0 #define DISPOSITION_DISMISS 0
#define DISPOSITION_CONTINUE_SEARCH 1 #define DISPOSITION_CONTINUE_SEARCH 1
@ -17,6 +18,16 @@
#define EXCEPTION_EXIT_UNWIND 4 #define EXCEPTION_EXIT_UNWIND 4
#define EXCEPTION_UNWINDING 2 #define EXCEPTION_UNWINDING 2
/* See seh_prolog.s */
SEH_FRAME_NewEsp = 0 /* 0x00 */
SEH_FRAME_unused = 4 /* 0x04 */
SEH_FRAME_PreviousRecord = 8 /* 0x08 */
SEH_FRAME_Handler = 12 /* 0x0c */
SEH_FRAME_SEHTable = 16 /* 0x10 */
SEH_FRAME_Disable = 20 /* 0x14 */
SEH_FRAME_OriginalEbp = 24 /* 0x18 */
SEH_FRAME_Size = 28 /* 0x1c */
EXTERN _RtlUnwind@16:PROC EXTERN _RtlUnwind@16:PROC
@ -301,7 +312,9 @@ except_return2:
__except_handler3: __except_handler3:
PARAM_ExceptionRecord = 8
PARAM_RegistrationFrame = 12
PARAM_Context = 16
/* Setup stack and save volatiles */ /* Setup stack and save volatiles */
push ebp push ebp
mov ebp, esp mov ebp, esp
@ -315,23 +328,23 @@ __except_handler3:
cld cld
/* Get exception registration and record */ /* Get exception registration and record */
mov ebx, [ebp+12] mov ebx, [ebp+PARAM_RegistrationFrame]
mov eax, [ebp+8] mov eax, [ebp+PARAM_ExceptionRecord]
/* Check if this is an unwind */ /* Check if this is an unwind */
test dword ptr [eax+4], EXCEPTION_EXIT_UNWIND + EXCEPTION_UNWINDING test dword ptr [eax+EXCEPTION_RECORD_EXCEPTION_FLAGS], EXCEPTION_EXIT_UNWIND + EXCEPTION_UNWINDING
jnz except_unwind3 jnz except_unwind3
/* Save exception pointers structure */ /* Save exception pointers structure */
mov [ebp-8], eax mov [ebp-8+EXCEPTION_POINTERS_EXCEPTION_RECORD], eax
mov eax, [ebp+16] mov eax, [ebp+PARAM_Context]
mov [ebp-4], eax mov [ebp-8+EXCEPTION_POINTERS_CONTEXT_RECORD], eax
lea eax, [ebp-8] lea eax, [ebp-8]
mov [ebx-4], eax mov [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_unused], eax
/* Get the try level and scope table */ /* Get the try level and scope table */
mov esi, [ebx+12] mov esi, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_Disable]
mov edi, [ebx+8] mov edi, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_SEHTable]
/* FIXME: Validate the SEH exception */ /* FIXME: Validate the SEH exception */
@ -343,13 +356,13 @@ except_loop3:
/* Check if this is the termination handler */ /* Check if this is the termination handler */
lea ecx, [esi+esi*2] lea ecx, [esi+esi*2]
mov eax, [edi+ecx*4+4] mov eax, [edi+ecx*4+4]
or eax, eax test eax, eax
jz except_continue3 jz except_continue3
/* Save registers clear them all */ /* Save registers clear them all */
push esi push esi
push ebp push ebp
lea ebp, [ebx+16] lea ebp, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_OriginalEbp]
xor ebx, ebx xor ebx, ebx
xor ecx, ecx xor ecx, ecx
xor edx, edx xor edx, edx
@ -362,19 +375,19 @@ except_loop3:
pop esi pop esi
/* Restore ebx and check the result */ /* Restore ebx and check the result */
mov ebx, [ebp+12] mov ebx, [ebp+PARAM_RegistrationFrame]
or eax, eax test eax, eax
jz except_continue3 jz except_continue3
js except_dismiss3 js except_dismiss3
/* So this is an accept, call the termination handlers */ /* So this is an accept, call the termination handlers */
mov edi, [ebx+8] mov edi, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_SEHTable]
push ebx push ebx
call __global_unwind2 call __global_unwind2
add esp, 4 add esp, 4
/* Restore ebp */ /* Restore ebp */
lea ebp, [ebx+16] lea ebp, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_OriginalEbp]
/* Do local unwind */ /* Do local unwind */
push esi push esi
@ -387,7 +400,7 @@ except_loop3:
/* Set new try level */ /* Set new try level */
lea ecx, [esi+esi*2] lea ecx, [esi+esi*2]
mov eax, [edi+ecx*4] mov eax, [edi+ecx*4]
mov [ebx+12], eax mov [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_Disable], eax
/* Clear registers and call except handler */ /* Clear registers and call except handler */
mov eax, [edi+ecx*4+8] mov eax, [edi+ecx*4+8]
@ -400,7 +413,7 @@ except_loop3:
except_continue3: except_continue3:
/* Reload try level and except again */ /* Reload try level and except again */
mov edi, [ebx+8] mov edi, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_SEHTable]
lea ecx, [esi+esi*2] lea ecx, [esi+esi*2]
mov esi, [edi+ecx*4] mov esi, [edi+ecx*4]
jmp except_loop3 jmp except_loop3
@ -410,22 +423,20 @@ except_dismiss3:
mov eax, DISPOSITION_DISMISS mov eax, DISPOSITION_DISMISS
jmp except_return3 jmp except_return3
except_search3:
/* Continue searching */
mov eax, DISPOSITION_CONTINUE_SEARCH
jmp except_return3
/* Do local unwind */ /* Do local unwind */
except_unwind3: except_unwind3:
push ebp push ebp
mov ebp, [ebx+16] mov ebp, [ebx-SEH_FRAME_PreviousRecord+SEH_FRAME_OriginalEbp]
push -1 push -1
push ebx push ebx
call __local_unwind2 call __local_unwind2
add esp, 8 add esp, 8
/* Retore EBP and set return disposition */ /* Restore EBP */
pop ebp pop ebp
except_search3:
/* Continue searching */
mov eax, DISPOSITION_CONTINUE_SEARCH mov eax, DISPOSITION_CONTINUE_SEARCH
except_return3: except_return3: