Webbyte ptr 表示变量是字节变量。如果不指定,编译器就不知道变量的类型。 当然,也有word ptr, dword ptr等等。 WebDec 15, 2024 · In ecx I have some string, like "abc". mov ah, BYTE PTR [ecx+0] mov al, BYTE PTR [ecx+1] What does it exactly do? It's like in ah I have "a" and in al I have "b"?
x86, difference between BYTE and BYTE PTR - Stack Overflow
WebThe PTR operator lets you override a variable's default size. The TYPE operator returns the size (in bytes) of each element in an array. The LENGTHOF operator returns the number of elements in an array. The SIZEOF operator returns the number of bytes used by an array initializer. 11. Identifiers WebFeb 15, 2024 · 0x8048ffa add BYTE PTR [eax], al. 0x8048ffc add BYTE PTR [eax], al. 0x8048ffe add BYTE PTR [eax], al ... Currently, it’s zero. If the first instruction in our program gets executed, EAX should contain 8. Let’s type si and hit enter. si command is used to do a single step, which means execute one instruction. Let us see what happened to the ... solid molecules image
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Web推荐于2024-09-02 · TA获得超过8507个赞. 关注. 把地址si+5处的字节变量加1。. byte ptr 表示变量是字节变量。. 如果不指定,编译器就不知道变量的类型。. 当然,也有word ptr, dword ptr等等。. 18. 评论. 分享. Webcode seg e t. 3 seg e ts: code, data, stac beginning of a procedure source add eax,40000h dti ti; EAX sub eax,20000h ; EAX = 30000h call DumpRegs ; display registers exit destination defined in Irvine32 inc to end a program main ENDP END main marks the last line and defined in Irvine32.inc to end a program 9 define the startup procedure WebThis shows how gdb displays these four bytes as though they represent two 16-bit int s stored in little endian format. (You can now see why I entered such a strange integer in this demonstration.) (gdb)print ptr $3 = (int *) 0x7efff178 (gdb)print &ptr $4 = (int **) 0x7efff17c 🔗 Look carefully at the ptr variable. solid mount for grab bars