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Microsoft discloses more Windows code | |
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| Time: 02:19 EST/07:19 GMT | News Source: News.com | Posted By: Byron Hinson | ||
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Microsoft on Tuesday disclosed technical information vital to allowing third-party developers to create software that works well with Windows. The Redmond, Wash.-based company released the information as part of its pending settlement with the Justice Department and nine of 18 states. The settling parties are waiting for a federal judge to either approve or reject the November agreement. The software titan posted the information on the Microsoft Developer Network (MSDN) Web site one day ahead of the information's scheduled Wednesday release. | ||
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| #1 By 9640 (195.92.168.172) at 8/28/2002 5:59:33 AM |
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The following sample x86 assembly code gets the Terminal Services Session ID associated with the current process:
mov eax,fs:[00000018] mov eax,[eax+0x30] mov eax,[eax+0x1d4] #1 Nice one. Probably explains why Win98 crashes a lot. Brings back memories of when I coded in x86 assembler on an original IBM PC 8086. (I think it was actually an 8088? with an 8 bit data bus processor instead of 16 bit that the 8086 has). I understand EAX being segment register ES and register AX but the reference to an FS register. What is this? A new segment register not in the original 8086? The code appears to look up an address of the address of the Terminal Services Session ID whatever that is! #2 It is not machine code. It is assembler. Machine code looks like this: 85 4F 2B 5F 7E ie hex numbers. What that does on an x86 processor I don't know as I've made the numbers up! Please post links to new released Win APIs. http://www.lee.ic24.net/ This post was edited by Smiviz on Wednesday, August 28, 2002 at 06:00. |
| #2 By 9640 (195.92.168.166) at 8/28/2002 9:07:09 AM |
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#5 I understand that Exx registers are 32bits being made up of two 16bit registers. So FS and GS are new segment registers introduced in the 80386. Got it!
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| #3 By 9640 (195.92.168.166) at 8/28/2002 9:25:56 AM |
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#7 Taking EAX as an example I think this is 32bits made up of the ES segment register and the AX (accumulator). Its over 12 years since I've done any x86 assembler so won't be surprised if somebody corrects me on this.
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