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flat assembler > Linux > [solved] Problem with printf

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dstyl



Joined: 23 Jul 2015
Posts: 61
Hi dear FASM Members Wink ,
i have trouble using printf.
I want to pass an %s arg to printf.
But i get only my %s printed not the entire string.
Thanks in advance Smile
Code:
; -----------------------------------------------------------------------------
;Simple CPUID Programm. Based on agner.orgs asmlib
; -----------------------------------------------------------------------------
        global  main

        extern  printf

        default rel

                section .text

main:
                mov                     rdi, title
                xor                     rax, rax
                call            printf
;               call            cpuid                           ;
                mov                     rdi, bfer
                mov                     rsi, name
                xor                     rax, rax
                call            printf
                ret
cpuid:
        push            rbx
        mov             eax, esi
        mov             ecx, edx
        cpuid                          ; input eax, ecx. output eax, ebx, ecx, edx
        mov             [bfer],    eax
        mov             [bfer+4],  ebx
        mov             [bfer+8],  ecx
        mov             [bfer+12], edx
        pop             rbx        
        ret

                section .data

name:   db              "Vendor %s", 10, 0
title:  db              "CPUID v1.0 by capo245", 10, 0
bfer:   dd              "test", 10, 0
len:    equ     $-bfer
    
Post 30 Apr 2017, 09:40
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16131
Location: Hyperborea
Just looking at your code (i.e. I can't test it) you appear to have loaded the wrong registers in the second call to printf. Maybe RDI should point to 'name'?
Post 30 Apr 2017, 09:59
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dstyl



Joined: 23 Jul 2015
Posts: 61
Thanks it worked Smile
Post 30 Apr 2017, 10:16
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