3 replies

Assembly Program on 64-bit OpenBSD Compiles Without Errors but Shows No Output

I don't get any errors whatsoever , but why don't I get any output when running this program on 64-bit OpenBSD system.
I've compiled the code using:

as -o test.o test.s; ld -Bstatic test.o

as -o test.o test.s; ld -Bstatic test.o

The program executes without errors, but no text is printed to the console.

I'm wondering if there might be an issue with the way I'm handling the message. Any insights would be greatly appreciated.

Solution

It seems like your assembly program isn't printing text because it might be missing the correct system calls. On Unix-like systems (like OpenBSD), printing to the console usually involves using the

write

write

system call. Here's a simple, complete assembly program that prints "Hello, World!" to the console you can use this as a guide

.section .data
message: .asciz "Hello, World!\n"

.section .text
.global _start

_start:
    mov $1, %rax
    mov $1, %rdi
    mov $message, %rsi
    mov $13, %rdx
    syscall

    mov $60, %rax
    xor %rdi, %rdi 
    syscall

.section .data
message: .asciz "Hello, World!\n"

.section .text
.global _start

_start:
    mov $1, %rax
    mov $1, %rdi
    mov $message, %rsi
    mov $13, %rdx
    syscall

    mov $60, %rax
    xor %rdi, %rdi 
    syscall

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DIIS

DevHeads IoT Integration Server•2y ago•

3 replies

Marvee Amasi

Assembly Program on 64-bit OpenBSD Compiles Without Errors but Shows No Output

I don't get any errors whatsoever , but why don't I get any output when running this program on 64-bit OpenBSD system.
I've compiled the code using:

as -o test.o test.s; ld -Bstatic test.o

as -o test.o test.s; ld -Bstatic test.o

The program executes without errors, but no text is printed to the console.

I'm wondering if there might be an issue with the way I'm handling the message. Any insights would be greatly appreciated.

Solution

It seems like your assembly program isn't printing text because it might be missing the correct system calls. On Unix-like systems (like OpenBSD), printing to the console usually involves using the

write

write

system call. Here's a simple, complete assembly program that prints "Hello, World!" to the console you can use this as a guide

.section .data
message: .asciz "Hello, World!\n"

.section .text
.global _start

_start:
    mov $1, %rax
    mov $1, %rdi
    mov $message, %rsi
    mov $13, %rdx
    syscall

    mov $60, %rax
    xor %rdi, %rdi 
    syscall

.section .data
message: .asciz "Hello, World!\n"

.section .text
.global _start

_start:
    mov $1, %rax
    mov $1, %rdi
    mov $message, %rsi
    mov $13, %rdx
    syscall

    mov $60, %rax
    xor %rdi, %rdi 
    syscall

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Assembly Program on 64-bit OpenBSD Compiles Without Errors but Shows No Output

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