[MPlayer-users] [BUG] Still segfault problems with -vo vesa

[XI]

Hi again,

I am ready to spend time to find problems, but if no one wants to reply, 
I'll never find the problem.

summary:
I use a mandrake9.0 with a kernel-2.4.19 and glibc-2.2.5. Mplayer 
segfault when I try to use it with -vo vesa.

Since my last post, I have tested this on my mdk9:
~ use kernel 2.4.8 from a mandrake8.1 (mplayer -vo vesa worked with 
mdk8.1). Mplayer still segfault
~ use glibc-2.2.4 from a mandrake8.1: It works!

So, I am quite sure that the last glibc (2.2.5) cause mplayer to 
segfault with -vo vesa.
Now, I would like to know if the bug is in mplayer or in the glibc. So 
could someone explain me line by line the aim of this assembler code, 
because mplayer seems to segfault while executing it (see my previous 
mail for more details):
 > #ifdef __PIC__
 >         asm volatile (
 >          "pushl %%ebx\n\t"
 >          "movl %2, %%ebx\n\t"
 >          "int $0x80\n\t"
 >          "popl %%ebx"
 >          : "=a" (r)
 >          : "0" (113), "r" (vm));
 > #else
 >         asm volatile (
 >          "int $0x80"
 >          : "=a" (r)
 >          : "0" (113), "b" (vm));
 > #endif

One other thing: could people with a glibc-2.2.5 try mplayer in vesa 
mode and tell me if it works.
This is very simple, just go in text only mode, and type "mplayer -vo 
vesa movie.avi" for example.


Thanks for the replies.
					Xavier


XI wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi,
> 
> I still can't get mplayer working with -vo vesa with a mandrake 9.0.
> 
> Since my previous thread, I have upgrated to mplayer-0.9pre10, and I 
> have done some inverstigations. Here is my previous thread:
> http://www.mplayerhq.hu/pipermail/mplayer-users/2002-October/023045.html
> 
> 
> Result of my investigations:
> 
> *** problem seems to occur on all mandrake 9.0 based systems:
> I have tested lots of those, I always got a segfault.
> Could people with a mandrake 9.0 (or more especially with a glibc-2.2.5 
> or kernel-2.4.19) try if it works? (Gabor, I think you have mdk9).
> 
> *** Problem doesn't seems to come from gcc version:
> I have tested rpm package from mplayerhq.hu, it works with the mandrake 
> 8.1 but not with mandrake 9.0 (exactly the same hardware).
> 
> *** Running gdb gived me an error in libpthread, which was a bit strange 
> (see my previous mail for gdb output). Now I tried to add some printf 
> debug statement in source code:
> 
> I found that mplayer never arrives up to open("/dev/mem",O_RDWR) call as 
> gdb let us suppose! (linux/vbelib.c: 146: int vbeInit(void))
> 
> In fact, I found that mplayer segfault in file linux/lrmi.c: 732: in 
> function lrmi_vm86:
> /*
>  I don't know how to make sure I get the right vm86() from libc.
>  The one I want is syscall # 113 (vm86old() in libc 5, vm86() in glibc)
>  which should be declared as "int vm86(struct vm86_struct *);" in
>  <sys/vm86.h>.
> 
>  This just does syscall 113 with inline asm, which should work
>  for both libc's (I hope).
> */
> #if !defined(USE_LIBC_VM86)
> static int
> lrmi_vm86(struct vm86_struct *vm)
>         {
>         int r;
> #ifdef __PIC__
>         asm volatile (
>          "pushl %%ebx\n\t"
>          "movl %2, %%ebx\n\t"
>          "int $0x80\n\t"
>          "popl %%ebx"
>          : "=a" (r)
>          : "0" (113), "r" (vm));
> #else
>         asm volatile (
>          "int $0x80"
>          : "=a" (r)
>          : "0" (113), "b" (vm));
> #endif
>         return r;
>         }
> #else
> #define lrmi_vm86 vm86
> #endif
> 
> 
> *** In my sytem, USE_LIBC_VM86 and __PIC__ constants are not defined, so 
> there is a segfault when this code is executed:
>          asm volatile (
>          "int $0x80"
>          : "=a" (r)
>          : "0" (113), "b" (vm));
> 
> 
> *** As I don't know at all assembler, I need some help. What can I do, 
> test, change, ... now?
> 
> *** I have alse tried to define USE_LIBC_VM86, but I got the same problem.
> 
> *** I have also tried to upgrade my glibc to the last one from mandrake 
> ... same result.
> 
> *** For informations about my system, ... please read my previous mails:
> http://www.mplayerhq.hu/pipermail/mplayer-users/2002-October/023019.html
> and
> http://www.mplayerhq.hu/pipermail/mplayer-users/2002-October/023045.html
> 
> Thanks for help,
>                     Xavier
> 
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