How are the address of the memory and that of the register connected?(AddrConstant MIPS instruction)
Date : March 29 2020, 07:55 AM
wish help you to fix your issue In my computer organization course, I came across these basic MIPS instructions: , lw $t, offset($s) is encoded as 1000 11ss ssst tttt iiii iiii iiii iiii
1000 1110 0010 1000 0000 0000 0000 0100
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Assembly - x86 call instruction and memory address?
Date : March 29 2020, 07:55 AM
I hope this helps you . If you're disassembling .o object files that haven't been linked yet, the call address will just be a placeholder to be filled in by the linker. You can use objdump -drwc -Mintel to show the relocation types + symbol names from a .o (The -r option is the key. Or -R for an already-linked shared library.) objdump -M intel -d rs-asmbench:
...
00000000004020a0 <.loop>:
4020a0: 0f b6 c2 movzx eax,dl
4020a3: 0f b6 de movzx ebx,dh
...
402166: 49 83 c3 10 add r11,0x10
40216a: 0f 85 30 ff ff ff jne 4020a0 <.loop>
0000000000402170 <.last8>:
402170: 0f b6 c2 movzx eax,dl
objdump -M intel -d main.o
...
a5: 31 f6 xor esi,esi
a7: e8 00 00 00 00 call ac <main+0xac>
ac: 4c 63 e0 movsxd r12,eax
af: ba 00 00 00 00 mov edx,0x0
b4: 48 89 de mov rsi,rbx
b7: 44 89 f7 mov edi,r14d
ba: e8 00 00 00 00 call bf <main+0xbf>
bf: 83 f8 ff cmp eax,0xffffffff
c2: 75 cc jne 90 <main+0x90>
...
objdump -Mintel -d asm-pinsrw.o:
0000000000000040 <.loop>:
40: 0f b6 c2 movzx eax,dl
43: 0f b6 de movzx ebx,dh
...
106: 49 83 c3 10 add r11,0x10
10a: 0f 85 30 ff ff ff jne 40 <.loop>
0000000000000110 <.last8>:
110: 0f b6 c2 movzx eax,dl
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Moving the memory address of a 32 bit register [esi] into an 8 bit low register in Assembly language x86
Tag : arrays , By : Kubla Khan
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further MASM infers the byte ptr [esi] operand-size based on the size of AL, and does an 8-bit load from the memory pointed to by the 32-bit pointer. The square brackets are a dereference for registers.
You could zero-extend those 8 bits to fill EAX with movzx eax, byte ptr [esi]. (Then you wouldn't need to zero eax earlier).
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How is data, address and Instruction differentiated in Processor/Register/memory?
Date : March 29 2020, 07:55 AM
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x86 Assembly MOV instruction - Register to Register and Memory to Memory
Date : March 29 2020, 07:55 AM
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