I want to dmix for my MIPS board, how can I do?

I want to dmix for my MIPS board, how can I do?

[李建坤]

alsa-devel，

  I'm an device driver developer for MIPS board. Now, I'm in urgent need of dmix source code for my Achemy board.
  I want to dmix on my MIPS Au1x00 board, Segmentation Fault occurs. I look up the code of pcm_dmix.c for possible reason, 
  it says,
    #warning Please, recode mix_areas1() routine to your architecture...
	warning Please, recode mix_areas2() routine to your architecture...
  Does it mean the dmix can only be used on X86 architecture now?
  if I want to use it on my MIPS board, how can I do? 
  
  Looking forward to anyone's reply! Tanks in advance!

  Cheres,
  Li Jian-kun

　　　　　　　　li_jiankun@hotmail.com
　　　　　　　　　　2005-03-07

Re: I want to dmix for my MIPS board, how can I do?

[Lee Revell]

On Mon, 2005-03-07 at 22:24 +0800, 李建坤 wrote:
> alsa-devel，
> 
>   I'm an device driver developer for MIPS board. Now, I'm in urgent need of dmix source code for my Achemy board.
>   I want to dmix on my MIPS Au1x00 board, Segmentation Fault occurs. I look up the code of pcm_dmix.c for possible reason, 
>   it says,
>     #warning Please, recode mix_areas1() routine to your architecture...
> 	warning Please, recode mix_areas2() routine to your architecture...
>   Does it mean the dmix can only be used on X86 architecture now?
>   if I want to use it on my MIPS board, how can I do? 
>   
>   Looking forward to anyone's reply! Tanks in advance!

Yup, that's exactly what it means.  Dmix is only implemented for x86
now.  If you want to use it on another arch you have to code it
yourself.

But, isn't there a cleaner way to handle this than segfaulting?  Why do
we even compile the plugin for non-x86 archs?

Lee




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Re: I want to dmix for my MIPS board, how can I do?

[Takashi Iwai]

At Mon, 07 Mar 2005 14:35:10 -0500,
Lee Revell wrote:
> 
> On Mon, 2005-03-07 at 22:24 +0800, 李建坤 wrote:
> > alsa-devel，
> > 
> >   I'm an device driver developer for MIPS board. Now, I'm in urgent need of dmix source code for my Achemy board.
> >   I want to dmix on my MIPS Au1x00 board, Segmentation Fault occurs. I look up the code of pcm_dmix.c for possible reason, 
> >   it says,
> >     #warning Please, recode mix_areas1() routine to your architecture...
> > 	warning Please, recode mix_areas2() routine to your architecture...
> >   Does it mean the dmix can only be used on X86 architecture now?
> >   if I want to use it on my MIPS board, how can I do? 
> >   
> >   Looking forward to anyone's reply! Tanks in advance!
> 
> Yup, that's exactly what it means.  Dmix is only implemented for x86
> now.  If you want to use it on another arch you have to code it
> yourself.
> 
> But, isn't there a cleaner way to handle this than segfaulting?  Why do
> we even compile the plugin for non-x86 archs?

Well, segfault is not intended, of course :)

Does the segfault still happen with the CVS version?
If so, there must be something wrong in another part (e.g. the general
mmap support on MIPS).


Takashi


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Re: I want to dmix for my MIPS board, how can I do?

[Lee Revell]

On Mon, 2005-03-07 at 20:44 +0100, Takashi Iwai wrote:
> At Mon, 07 Mar 2005 14:35:10 -0500,
> Lee Revell wrote:
> > 
> > On Mon, 2005-03-07 at 22:24 +0800, 李建坤 wrote:
> > > alsa-devel，
> > > 
> > >   I'm an device driver developer for MIPS board. Now, I'm in urgent need of dmix source code for my Achemy board.
> > >   I want to dmix on my MIPS Au1x00 board, Segmentation Fault occurs. I look up the code of pcm_dmix.c for possible reason, 
> > >   it says,
> > >     #warning Please, recode mix_areas1() routine to your architecture...
> > > 	warning Please, recode mix_areas2() routine to your architecture...
> > >   Does it mean the dmix can only be used on X86 architecture now?
> > >   if I want to use it on my MIPS board, how can I do? 
> > >   
> > >   Looking forward to anyone's reply! Tanks in advance!
> > 
> > Yup, that's exactly what it means.  Dmix is only implemented for x86
> > now.  If you want to use it on another arch you have to code it
> > yourself.
> > 
> > But, isn't there a cleaner way to handle this than segfaulting?  Why do
> > we even compile the plugin for non-x86 archs?
> 
> Well, segfault is not intended, of course :)
> 
> Does the segfault still happen with the CVS version?
> If so, there must be something wrong in another part (e.g. the general
> mmap support on MIPS).

IIRC someone else reported a segfault trying to use dmix with another
unsupported arch.  So this led me to believe the problem was related.

Lee



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Re: I want to dmix for my MIPS board, how can I do?

[Takashi Iwai]

At Mon, 07 Mar 2005 14:47:33 -0500,
Lee Revell wrote:
> 
> On Mon, 2005-03-07 at 20:44 +0100, Takashi Iwai wrote:
> > At Mon, 07 Mar 2005 14:35:10 -0500,
> > Lee Revell wrote:
> > > 
> > > On Mon, 2005-03-07 at 22:24 +0800, 李建坤 wrote:
> > > > alsa-devel，
> > > > 
> > > >   I'm an device driver developer for MIPS board. Now, I'm in urgent need of dmix source code for my Achemy board.
> > > >   I want to dmix on my MIPS Au1x00 board, Segmentation Fault occurs. I look up the code of pcm_dmix.c for possible reason, 
> > > >   it says,
> > > >     #warning Please, recode mix_areas1() routine to your architecture...
> > > > 	warning Please, recode mix_areas2() routine to your architecture...
> > > >   Does it mean the dmix can only be used on X86 architecture now?
> > > >   if I want to use it on my MIPS board, how can I do? 
> > > >   
> > > >   Looking forward to anyone's reply! Tanks in advance!
> > > 
> > > Yup, that's exactly what it means.  Dmix is only implemented for x86
> > > now.  If you want to use it on another arch you have to code it
> > > yourself.
> > > 
> > > But, isn't there a cleaner way to handle this than segfaulting?  Why do
> > > we even compile the plugin for non-x86 archs?
> > 
> > Well, segfault is not intended, of course :)
> > 
> > Does the segfault still happen with the CVS version?
> > If so, there must be something wrong in another part (e.g. the general
> > mmap support on MIPS).
> 
> IIRC someone else reported a segfault trying to use dmix with another
> unsupported arch.  So this led me to believe the problem was related.

Could be.  I wanted to make sure of this because I changed/fixed the
dmix code recently on CVS.


Takashi


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Re: I want to dmix for my MIPS board, how can I do?

[Jaroslav Kysela]

On Mon, 7 Mar 2005, Lee Revell wrote:

> On Mon, 2005-03-07 at 22:24 +0800, ??? wrote:
> > alsa-devel,
> > 
> >   I'm an device driver developer for MIPS board. Now, I'm in urgent need of dmix source code for my Achemy board.
> >   I want to dmix on my MIPS Au1x00 board, Segmentation Fault occurs. I look up the code of pcm_dmix.c for possible reason, 
> >   it says,
> >     #warning Please, recode mix_areas1() routine to your architecture...
> > 	warning Please, recode mix_areas2() routine to your architecture...
> >   Does it mean the dmix can only be used on X86 architecture now?
> >   if I want to use it on my MIPS board, how can I do? 
> >   
> >   Looking forward to anyone's reply! Tanks in advance!
> 
> Yup, that's exactly what it means.  Dmix is only implemented for x86
> now.  If you want to use it on another arch you have to code it
> yourself.
> 
> But, isn't there a cleaner way to handle this than segfaulting?  Why do
> we even compile the plugin for non-x86 archs?

Well, there is some C code which can be compiled for all archs. Although 
it won't work correctly, it will give a clue, what needs to be written in 
assembler.

It might be that this code is buggy. Do we know the segfault point in 
alsa-lib (backtrace)?
	
					Jaroslav

-----
Jaroslav Kysela <perex@perex.cz>


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Re: I want to dmix for my MIPS board, how can I do?

[李建坤]

Hi Everyone,

  There should sth more about dmix Segment Fault on my MIPS board. The error even occurs before excuting the mix_arears1()
and mix_arears2(). The trace of the code is as followed:
	
root@192.168.100.225:~/ljk/wavtest# aplay -D dmix window11025_stereo.wav 
Segmentation fault
root@192.168.100.225:~/ljk/wavtest# strace aplay -D dmix window11025_stereo.wav 
execve("/usr/bin/aplay", ["aplay", "-D", "dmix", "window11025_stereo.wav"], [/* 19 vars */]) = 0
uname({sys="Linux", node="192.168.100.225", ...}) = 0
brk(0)                                  = 0x10000530
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=16307, ...}) = 0
old_mmap(NULL, 16307, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aac0000
close(3)                                = 0
open("/usr/lib/libasound.so.2", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\260q\1"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=4459102, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaa8000
old_mmap(NULL, 1258632, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x2ab00000
mprotect(0x2abf0000, 275592, PROT_NONE) = 0
old_mmap(0x2ac2f000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xef000) = 0x2ac2f000
close(3)                                = 0
open("/lib/libm.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\260E\0"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0555, st_size=851507, ...}) = 0
old_mmap(NULL, 810304, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x2ac40000
mprotect(0x2acc6000, 261440, PROT_NONE) = 0
old_mmap(0x2ad05000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x85000) = 0x2ad05000
close(3)                                = 0
open("/lib/libdl.so.2", O_RDONLY)       = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\260\22"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0555, st_size=148921, ...}) = 0
old_mmap(NULL, 273440, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x2ad40000
mprotect(0x2ad43000, 261152, PROT_NONE) = 0
old_mmap(0x2ad82000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x2ad82000
close(3)                                = 0
open("/lib/libpthread.so.0", O_RDONLY)  = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\240E\0"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0555, st_size=299404, ...}) = 0
old_mmap(NULL, 368864, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x2adc0000
mprotect(0x2add4000, 286944, PROT_NONE) = 0
old_mmap(0x2ae13000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x13000) = 0x2ae13000
old_mmap(0x2ae1a000, 224, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2ae1a000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\204Y\1"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0555, st_size=2200545, ...}) = 0
old_mmap(NULL, 1706272, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x2ae40000
mprotect(0x2af96000, 305440, PROT_NONE) = 0
old_mmap(0x2afd5000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x155000) = 0x2afd5000
old_mmap(0x2afdd000, 14624, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2afdd000
close(3)                                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaa9000
munmap(0x2aac0000, 16307)               = 0
getpid()                                = 21801
getpid()                                = 21801
rt_sigaction(SIGRT_0, {SIG_DFL}, NULL, 16) = 0
rt_sigaction(SIGRT_1, {SIG_DFL}, NULL, 16) = 0
rt_sigaction(SIGRT_2, {SIG_DFL}, NULL, 16) = 0
rt_sigprocmask(SIG_BLOCK, [32], NULL, 16) = 0
_sysctl({{CTL_KERN, KERN_VERSION}, 2, 0x7fff7930, 32, (nil), 0}) = 0
brk(0)                                  = 0x10000530
brk(0x10000560)                         = 0x10000560
brk(0x10001000)                         = 0x10001000
stat("/usr/share/alsa/alsa.conf", {st_mode=S_IFREG|0644, st_size=8010, ...}) = 0
open("/usr/share/alsa/alsa.conf", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=8010, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaaa000
read(3, "#\n#  ALSA library configuration "..., 4096) = 4096
brk(0x10002000)                         = 0x10002000
brk(0x10003000)                         = 0x10003000
brk(0x10004000)                         = 0x10004000
brk(0x10005000)                         = 0x10005000
read(3, " FORMAT ]\n\t@args.FILE {\n\t\ttype s"..., 4096) = 3914
brk(0x10006000)                         = 0x10006000
brk(0x10007000)                         = 0x10007000
brk(0x10008000)                         = 0x10008000
brk(0x10009000)                         = 0x10009000
brk(0x1000a000)                         = 0x1000a000
read(3, "", 4096)                       = 0
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x2aaaa000, 4096)                = 0
access("/etc/asound.conf", R_OK)        = 0
open("/etc/asound.conf", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=600, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaaa000
read(3, "\npcm.ossmix {\n   type dmix\n   ip"..., 4096) = 600
read(3, "", 4096)                       = 0
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x2aaaa000, 4096)                = 0
access("/root/.asoundrc", R_OK)         = -1 ENOENT (No such file or directory)
getuid()                                = 0
ipc(0x2)                                = 0
ipc(0x1)                                = 0
ipc(0x17)                               = 65536
ipc(0x15)                               = 0
mlock(0x2aac0000, 1008)                 = 0
ipc(0x18)                               = 0
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

Can anyone see sth wrong with it?

Cheers,
Li Jian-kun  

li_jiankun@hotmail.com
	2005-03-08


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Re: I want to dmix for my MIPS board, how can I do?

[Takashi Iwai]

At Tue, 8 Mar 2005 11:03:57 +0800,
li_jiankun@hotmail.com wrote:
> 
> Hi Everyone,
> 
>   There should sth more about dmix Segment Fault on my MIPS board. The error even occurs before excuting the mix_arears1()
> and mix_arears2(). The trace of the code is as followed:

Could you try gdb and backtrace?


Takashi


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Re: I want to dmix for my MIPS board, how can I do?

[Takashi Iwai]

At Sat, 12 Mar 2005 10:45:30 +0800,
李建坤 wrote:
> 
> Takashi Iwai,
>   
>   Thank you for your reply!
>   When aplay -D dmix window11025_stereo.wav break down on my mips board, it produced a dump core file.
>   When I debug it using gdb on my Au1100 board, it said:	
>   #########################################################################
>     Core was generated by `aplay -D dmix window11025_stereo.wav'. 
>     Program terminated with signal 11, Segmentation fault.
>     Cannot access memory at address 0x2ab96d78
>  ###########################################################################
>  I don't know why, even it crashed down before beginning to do software mixing.

What about to run aplay on gdb?
Can't you get the backtrace of the segfault point?


Takashi


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