* The same assembly code but different result on cygwin and Centos
@ 2011-04-26 7:44 matthew chao
2011-04-26 13:02 ` Václav Haisman
0 siblings, 1 reply; 2+ messages in thread
From: matthew chao @ 2011-04-26 7:44 UTC (permalink / raw)
To: cygwin
The code below assigns an integer number 20 to %ebx, which can be
CORRECTLY assembled on both cygwin and CentOS,
###code begin###
.section .data
items:
.long 20
.section .text
.globl _start
_start:
movl $0,%edi
movl items(,%edi,4),%eax
movl %eax,%ebx
movl $1,%eax
int $0x80
###code end###
However, when I wanted to get the number(20) by the following way, I
found the difference between cygwin and CentOS,
cygwin:
------------------------------
Matt@Matt-PC ~
$ ./max2
Matt@Matt-PC ~
$ echo $?
127 # The result is WRONG
------------------------------
CentOS:
------------------------------
[Matt@localhost]# ./max2
[Matt@localhost]# echo $?
20 # The result is RIGHT
------------------------------
Could someone give me a hand?thanks
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* Re: The same assembly code but different result on cygwin and Centos
2011-04-26 7:44 The same assembly code but different result on cygwin and Centos matthew chao
@ 2011-04-26 13:02 ` Václav Haisman
0 siblings, 0 replies; 2+ messages in thread
From: Václav Haisman @ 2011-04-26 13:02 UTC (permalink / raw)
To: cygwin
matthew chao wrote, On 26.4.2011 4:52:
> The code below assigns an integer number 20 to %ebx, which can be
> CORRECTLY assembled on both cygwin and CentOS,
>
> ###code begin###
> .section .data
> items:
> .long 20
>
> .section .text
> .globl _start
> _start:
> movl $0,%edi
> movl items(,%edi,4),%eax
> movl %eax,%ebx
>
> movl $1,%eax
> int $0x80
>[...]
Cygwin is Linux emulation DLL, it runs on top of Win32 API. It does not
emulate Linux' syscalls; it cannot emulate that.
--
VH
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2011-04-26 7:44 The same assembly code but different result on cygwin and Centos matthew chao
2011-04-26 13:02 ` Václav Haisman
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