GAS Intel Syntax won't assemble mov rdi, offset:symbol

Asked Dec 06 '21 at 14:05

Active Dec 06 '21 at 18:57

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I'm new to x86 assembly and I'm following a practical work for the basics. I have 2 equivalent sample codes: One in AT&T syntax and the other on Intel syntax. When compiling theses with GCC, everything works fine for the AT&T syntax, but GCC gives me errors for the Intel version. Theses two files compiles nicely on my school computers, but won't on my personal one.

I must be missing some gcc configuration but I can't find anything on the net.

Here is the sample code:

    .intel_syntax noprefix
    .global main

    .text
main:
    mov     rdi, offset:message
    call    puts
    mov     rax, 0
    ret

message:
    .asciz "Hello, world!"

And the error messages:

$> gcc -o hello_intel hello_intel.S
hello_intel.S: Assembler messages:
hello_intel.S:6: Error: bad expression
hello_intel.S:6: Error: junk `message' after expression

edited Dec 06 '21 at 18:57

Peter Cordes

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asked Dec 06 '21 at 14:05

JM445

Do you have the same exact version of GCC on both computers? – Michael Dec 06 '21 at 14:08
1

FWIW, the assembler that I use (also Intel) doesn't accept the colon after `offset`. – 500 - Internal Server Error Dec 06 '21 at 14:24
Indeed they are not, 10.3.0 at school and 9.3.0 on my computer. I will try to update mine – JM445 Dec 06 '21 at 14:24
No change with version 10.3.0 – JM445 Dec 06 '21 at 14:31
4

Try just `mov rdi, offset message`. I've never seen a colon in that place. – fuz Dec 06 '21 at 14:54
Ok, that worked. Now I can't understand why this colon is there in the samples and why it work like a charm on my school computers... – JM445 Dec 06 '21 at 15:14
1

What exact source file were you able to assemble on your school computer that used `offset:symbol`? What did `as --version` say on that machine? – Peter Cordes Dec 06 '21 at 18:57

GAS Intel Syntax won't assemble mov rdi, offset:symbol

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