44 lines
1.0 KiB
ArmAsm
44 lines
1.0 KiB
ArmAsm
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;; Lesson 9: User Input via STDIN.
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%include "functions.asm"
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%define ILEN 255 ; Amount of space to reserve
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;; sys/unistd_64.h
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%define SYS_read 0
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;; unistd.h
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%define STDIN 0
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section .data
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msg1 db "Please enter your name: ", 0h
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msg2 db "Hello, ", 0h
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section .bss
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sinput resb ILEN ; Reserve 255 bytes of space. The space has no guarantees that I know of.
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section .text
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global _start
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_start:
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;; Again, the challenge with x86_64 is knowing what register to us.
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;; In this case, RSI - Source Indexing.
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mov rsi, msg1
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call puts
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mov rax, SYS_read ; General purpose register
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mov rdi, STDIN ; Destination Index
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mov rsi, sinput ; Source register
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mov rdx, ILEN ; Common counter
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;; And remembering to use 'syscall' instead of interrupt-80
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syscall
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mov rsi, msg2
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call puts
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mov rsi, sinput
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call puts
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call exit_program
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