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18 thg 11, 2018 · @Kaunda: he means that instructions like imul eax, ecx and imul edx, ebx both do the same thing (to different regs), and the CPU doesn't care if you keep a loop counter in EBX or EDX. So for the most part register allocation is a free choice within a function. But x86 definitely has special-purpose uses for each register. e.g. variable-count shifts only work with the count …
7 thg 7, 2017 · while in the book the registers are: eax, ecx, edx, ebx, esp, ebp, esi, edi, eip, eflags, cs, ss, ds, es, fs, gs Can someone explain why they are different? I'm running on an AMD cpu; does AMD have different CPU registers from Intel? In this case can someone explain me the correspondence between the registers of the two architecture?
19 thg 2, 2021 · In my QEMU virtual machine, I need to use a specific CPU model, but with the maximum CPU flags enabled (for performance). To do that I wanted to use /proc/cpuinfo and use grep and cut to get the fl...
23 thg 10, 2017 · mov ecx, 16 looptop: . . . loop looptop How many times will this loop execute? What happens if ecx = 0 to start with? Does loop jump or fall-through in t...
16 thg 5, 2023 · Re: Laddvikter till Hornady's CX/ECX: by Jakob Sahlin » 16 May 2023, 22:46 Har precis laddat 140 grains ecx kulor till min 6.5a. 48 grain MRP, körde ner kulan till första strecket. Fick bra träffbilder på 100m och mätte kulans utgångshastighet till 834 m/s.
30 thg 3, 2010 · The following is a brief explanation of what each of the x86 general-purpose registers stands for: EAX: 'Extended Accumulator' - used for arithmetic and logical operations, as well as for storing return values from functions. EBX: 'Extended Base' - often used as a pointer to data in the data segment of memory. ECX: 'Extended Counter' - often used for loop and string …
imul also has an immediate form: imul ecx, ebx, 1234 does ecx = ebx * 1234. Many assemblers will accept imul ecx, 1234 as short-hand for imul ecx, ecx, 1234. These 32x32 => 32-bit forms of imul work correctly for signed or unsigned; the results of one-operand mul and imul only differ in the upper half (in EDX), not the low-half EAX output.
14 thg 7, 2009 · 在16位CPU中，AX、BX、CX和DX不能作为基址和变址寄存器来存放存储单元的地址，但在32位CPU中，其32位 寄存器EAX、EBX、ECX和EDX不仅可传送数据、暂存数据保存算术逻辑运算结果，而且也可作为指针寄存器， 所以，这些32位寄存器更具有通用性。
11 thg 11, 2022 · 35 eax, ebx, ecx and so on are actually registers, which can be seen as 'hardware' variables, somewhat similar to higher level-language's variables. Registers can be used in your software directly with instructions such as mov, add or cmp. The leading e stands for e xtended and means that your register is 32 bits wide.
9 thg 9, 2009 · Also to avoid 0s when compiled as used on shell codes for exploitation of buffer overflows, etc. Why avoid the 0 ? Well, 0 represents the end of string in c/c++ and the shell code would be truncated if the mean of exploitation is a string processing function or the like. Btw im referring to the original question: 'Any reason to do a “xor eax, eax”?' not what the MSVC++ …
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