49 lines
696 B
ArmAsm
49 lines
696 B
ArmAsm
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.intel_syntax noprefix
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.globl _start
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.text
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# String-copying routine.
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# Commented-out lines would also return the starting address of the destination address.
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strcpy:
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# push rsi
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.loop:
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movb r10b, [rdi]
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cmpb r10b, 0
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je .end
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movb [rsi], r10b
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inc rdi
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inc rsi
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jmp .loop
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.end:
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# pop rax
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ret
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_start:
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mov rdi, offset str2
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mov rsi, offset str1
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call strcpy
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# mov rsi, rax -- would copy the string start address to rsi
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mov rax, 1
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mov rdi, 1
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mov rsi, offset str1
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mov rdx, 14
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syscall
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# exit
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mov rax, 60
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mov rdi, 0
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syscall
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.bss
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str1:
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.skip 30
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.data
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str2:
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.string "Hello, world!\n"
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