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slack_eater
n00b
Joined: 20 Oct 2010
Posts: 5
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 Posted: Wed Oct 20, 2010 11:44 am Post subject: [Solved] Convert assembly to AT&T syntax |
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Hello to everyone,
does anyone know how to convert the following C-assembly inline code from the Intel syntax to the AT&T syntax?
Is there a way to use the intel syntax with gcc?
| Code: | #include <stdio.h>
#define MAXLEN 80
main(void)
{
unsigned char text[MAXLEN + 1];
unsigned long len;
scanf("%s", &text);
__asm
{
mov -1, ecx
start_loop:
inc ecx
cmp text[ecx], 0
jne start_loop
mov len, ecx
}
printf("%d", len);
} |
Thanks in advance 
Last edited by slack_eater on Wed Oct 20, 2010 9:03 pm; edited 1 time in total |
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avendesora
Veteran
Joined: 16 Aug 2002
Posts: 1739
Location: Betelgeuse vicinity
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| Posted: Wed Oct 20, 2010 4:54 pm Post subject: |
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Check out this reference.
The following appears to work (32bit mode).
| Code: | #include <stdio.h>
#define MAXLEN 80
int main(void)
{
char text[MAXLEN+1];
unsigned long len;
scanf("%s", text);
__asm__(
" mov $-1, %%ecx\n\t"
"start_loop:\n\t"
" inc %%ecx\n\t"
" cmpb $0, (%1,%%ecx)\n\t"
" jne start_loop\n\t"
" mov %%ecx, %0\n\t"
: "=r"(len)
: "r"(text)
: "%ecx"
);
printf("%lu", len);
return 0;
} |
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slack_eater
n00b
Joined: 20 Oct 2010
Posts: 5
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| Posted: Wed Oct 20, 2010 6:25 pm Post subject: |
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Thanks!
It works great!  |
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