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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: olcott Newsgroups: comp.theory Subject: Re: DD emulated by HHH cannot possibly terminate normally --- x86 code Date: Sat, 1 Mar 2025 13:01:41 -0600 Organization: A noiseless patient Spider Lines: 64 Message-ID: References: <5c444106eafa1235cc4953d9be6faddf8825bcf3@i2pn2.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sat, 01 Mar 2025 20:01:42 +0100 (CET) Injection-Info: dont-email.me; posting-host="7b4f06e456023699d538e77dba30bc57"; logging-data="380649"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/IVUH41qc7CuuWSUFBZtCL" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:W/r1JAG0mMcNdN44pMiWFgq+G6I= In-Reply-To: <5c444106eafa1235cc4953d9be6faddf8825bcf3@i2pn2.org> X-Antivirus: Norton (VPS 250301-6, 3/1/2025), Outbound message Content-Language: en-US X-Antivirus-Status: Clean Bytes: 3717 On 3/1/2025 10:05 AM, Richard Damon wrote: > On 3/1/25 9:41 AM, olcott wrote: >> On 3/1/2025 6:49 AM, Richard Damon wrote: >>> On 2/28/25 7:47 PM, olcott wrote: >>>> _DD() >>>> [00002133] 55         push ebp      ; housekeeping >>>> [00002134] 8bec       mov ebp,esp   ; housekeeping >>>> [00002136] 51         push ecx      ; make space for local >>>> [00002137] 6833210000 push 00002133 ; push DD >>>> [0000213c] e882f4ffff call 000015c3 ; call HHH(DD) >>>> [00002141] 83c404     add esp,+04 >>>> [00002144] 8945fc     mov [ebp-04],eax >>>> [00002147] 837dfc00   cmp dword [ebp-04],+00 >>>> [0000214b] 7402       jz 0000214f >>>> [0000214d] ebfe       jmp 0000214d >>>> [0000214f] 8b45fc     mov eax,[ebp-04] >>>> [00002152] 8be5       mov esp,ebp >>>> [00002154] 5d         pop ebp >>>> [00002155] c3         ret >>>> Size in bytes:(0035) [00002155] >>>> >>>> When we hypothesize that the code at machine address >>>> 0000213c is an x86 emulator then we know that DD >>>> remains stuck in recursive emulation and cannot possibly >>>> reach its own "ret" instruction and terminate normally. >>>> >>>> When we add the additional complexity that HHH also >>>> aborts this sequence at some point then every level >>>> of recursive emulation immediately stops. This does >>>> not enable any DD to ever reach its "ret" instruction. >>>> >>> >>> But then you just negated your first assumption, as a partial >>> emulator that aborts its emulation, then DD no longer gets stuck. >>> >> >> Cannot possibly reach its own "ret" instruction and terminate normally >> proves non-termination whether aborted or not. >> >> Cannot possibly reach its own "ret" instruction and terminate normally >> proves non-termination whether aborted or not. >> >> Cannot possibly reach its own "ret" instruction and terminate normally >> proves non-termination whether aborted or not. >> >> > > But it DOES terminate DD emulated by HHH never terminates no matter how many times you try to get away with the straw-man deception of referring to anything at all besides DD EMULATED BY HHH DD EMULATED BY HHH DD EMULATED BY HHH DD EMULATED BY HHH DD EMULATED BY HHH DD EMULATED BY HHH -- Copyright 2025 Olcott "Talent hits a target no one else can hit; Genius hits a target no one else can see." Arthur Schopenhauer