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xdata ENDS ; COMDAT xdata xdata SEGMENT $unwind$ try_except@@YAXXZ DD 010409H DD 04204H DD imagerel __C_specific_handler DD 01H DD imagerel $LN9+4 DD imagerel $LN9+17 DD imagerel filt$0@ 0 try_except@@YAXXZ@4HA DD imagerel $LN9+17 ; Function compile flags: /Odtp xdata ENDS ; COMDAT try_except@@YAXXZ _TEXT SEGMENT try_except@@YAXXZ PROC ; try_except, COMDAT ; 28 : { $LN9: 00000 48 83 ec 28 sub rsp, 40 ; 00000028H ; 29 : __try ; 30 : { ; 31 : *((int *) 0) = 0; 00004 c7 04 25 00 00 00 00 00 00 00 00 mov DWORD PTR ds:0, 0 ; 32 : } 0000f eb 0a jmp SHORT $LN4@try_except $LN6@try_except: ; 33 : __except(ex_filter()) ; 34 : { ; 35 : global = 1; 00011 c7 05 00 00 00 00 01 00 00 00 mov DWORD PTR global@@3HA, 1 $LN4@try_except: ; 36 : } ; 37 : } 0001b 48 83 c4 28 add rsp, 40 ; 00000028H 0001f c3 ret 0 try_except@@YAXXZ ENDP ; try_except ; Function compile flags: /Odtp filt$0@ 0 try_except@@YAXXZ@4HA PROC ; `try_except ::`1 ::filt$0 00020 48 89 4c 24 08 mov QWORD PTR [rsp+8], rcx 00025 48 89 54 24 10 mov QWORD PTR [rsp+16], rdx 0002a 55 push rbp 0002b 48 83 ec 20 sub rsp, 32 ; 00000020H 0002f 48 8b ea mov rbp, rdx $LN5@filt$0:
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; 33 : __except(ex_filter())
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00032 e8 00 00 00 00 call ex_filter@@YAKXZ ; rrex_filter $LN7@filt$0: 00037 48 83 c4 20 add rsp, 32 ; 00000020H 0003b 5d pop rbp 0003c c3 ret 0 filt$0@ 0 try_except@@YAXXZ@4HA ENDP ; `try_except ::`1 ::filt$0 _TEXT ENDS
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The function code, shown in italic characters in Listing 1215, is as clean as possible There is no exception bookkeeping code, and only a single nonconditional jump on the line 32 indicates that the code uses exceptions (No conditional statement is in the function otherwise) How does the operating system know what to execute when an exception is generated on a protected block The first part of the listing, in bold italic font, answers this question The compiler generates a function information block that contains general information about each function, as well as about each block protected by an exception handler Each block is identified by an address s range covering the possible values of the instruction pointer while executing that block The current instruction pointer value is used by the exception-unwinding mechanism implemented in Windows x64 to locate the protected block containing the exception filter and the corresponding exception handler In Listing 1215, the $pdata$ try_except@@YAXXZ label contains information for the exception dispatcher that must be used when the function executes code between the LN9# and LN9#+32 addresses, relative to the start of the module In this case, a single protected block is stored under the $unwind$ try_except@@YAXXZ# label The block is identified by a range of addresses and contains the address of the exception filter and the location of code continuation after exception handling, as shown in the next listing:
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DD DD DD DD @imagerel($LN9#+4) @imagerel($LN9#+17) @imagerel( filt$0@ 0 try_except@@YAXXZ@4HA#) @imagerel($LN9#+17)
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At the end of the listing, few compiler-generated functions are used to invoke the block filters Filters are identified with symbols autogenerated and having the following form:
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`Function Name ::`Function Number ::filt$FilterNumber
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The generated code is extremely efficient, as it contains just the business logic, neglecting the exceptional code paths entirely The linker can relocate all exception-related code and information in a separate section of the module and compact all function code in a different section The resultant module is extremely efficient memory-wise, as it benefits at a maximum from the processor cache Only one condition must be met: The code should not raise exceptions In other words, the exception should really be an exception, not an expected error that can be returned over and over When the code raises another exception from inside the handler, Windows x64 starts a new exception dispatch that requires a new context to be allocated from the
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