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Re: insmod segfault

To: Bruno Randolf <bruno.randolf@4g-systems.de>
Subject: Re: insmod segfault
From: ilya@theIlya.com
Date: Thu, 17 Apr 2003 07:59:11 -0700
Cc: linux-mips@linux-mips.org
In-reply-to: <200304171329.37998.bruno.randolf@4g-systems.de>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <200304171329.37998.bruno.randolf@4g-systems.de>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.4i
I think you have to add -DMODULE when compiling soemthing as module...

On Thu, Apr 17, 2003 at 01:29:33PM +0200, Bruno Randolf wrote:
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> hello!
> 
> i have problems with a kernel module: when i insmod it, i get a segmentation 
> fault and "Unable to handle kernel paging request at virtual address 
> 00000004" oops, so as far as i understand it, it seems like relocation does 
> not occur properly.
> 
> i can reproduce the problem with the attached simple test code. when i insmod 
> only hello_module.o it works fine, but when i insmod the result of "ld" 
> (mod.o) i get the error. so it seems the problem is with the linker. or am i 
> using wrong compiler / linker flags or doing something stupid?
> 
> i compile with "gcc -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer 
> - -fno-strict-aliasing -mno-abicalls -G 0 -fno-pic -mcpu=r4600 -mips2 
> - -Wa,--trap -pipe -mlong-calls -I/usr/src/linux/include -O3 -D__KERNEL__ 
> - -DLINUX -DMESSAGES"
> 
> and link with "ld -r -o mod.o hello_module.o b.o"
> 
> versions:
> * au1500 CPU
> * kernel version 2.4.21-pre4 from cvs
> * gcc version 3.0.4 (also: gcc version 2.95.4)
> * GNU ld version 2.12.90.0.1 20020307 Debian/GNU Linux
> * insmod version 2.4.15
> 
> objdump -x mod.o says:
> 
> - ---
> 
> mod.o:     file format elf32-tradlittlemips
> mod.o
> architecture: mips:6000, flags 0x00000011:
> HAS_RELOC, HAS_SYMS
> start address 0x00000000
> private flags = 10001001: [abi=O32] [mips2] [not 32bitmode]
> 
> Sections:
> Idx Name          Size      VMA               LMA               File off  Algn
>   0 .reginfo      00000018  00000000  00000000  00000034  2**2
>                   CONTENTS, ALLOC, LOAD, READONLY, DATA, LINK_ONCE_SAME_SIZE
>   1 .text         00000070  00000000  00000000  00000050  2**4
>                   CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
>   2 .rodata       00000030  00000000  00000000  000000c0  2**4
>                   CONTENTS, ALLOC, LOAD, READONLY, DATA
>   3 .modinfo      0000001c  00000000  00000000  000000f0  2**2
>                   CONTENTS, ALLOC, LOAD, READONLY, DATA
>   4 .data         00000000  00000000  00000000  00000110  2**4
>                   CONTENTS, ALLOC, LOAD, DATA
>   5 .sbss         00000000  00000000  00000000  00000110  2**0
>                   ALLOC
>   6 .bss          00000000  00000000  00000000  00000110  2**4
>                   ALLOC
>   7 .comment      00000024  00000000  00000000  00000110  2**0
>                   CONTENTS, READONLY
>   8 .pdr          00000040  00000000  00000000  00000134  2**2
>                   CONTENTS, RELOC, READONLY
> SYMBOL TABLE:
> 00000000 l    d  .reginfo       00000000
> 00000000 l    d  .text  00000000
> 00000000 l    d  *ABS*  00000000
> 00000000 l    d  *ABS*  00000000
> 00000000 l    d  .rodata        00000000
> 00000000 l    d  .modinfo       00000000
> 00000000 l    d  .data  00000000
> 00000000 l    d  .sbss  00000000
> 00000000 l    d  .bss   00000000
> 00000000 l    d  .comment       00000000
> 00000000 l    d  .pdr   00000000
> 00000000 l    d  *ABS*  00000000
> 00000000 l    d  *ABS*  00000000
> 00000000 l    d  *ABS*  00000000
> 00000000 l    d  *ABS*  00000000
> 00000000 l    d  *ABS*  00000000
> 00000000 l    df *ABS*  00000000 hello_module.c
> 00000000 l     O .modinfo       0000001b __module_kernel_version
> 00000000 l    df *ABS*  00000000 b.c
> 00000004 g     O .scommon       00000004 b
> 00000038 g     F .text  00000000 cleanup_module
> 00000000 g     F .text  00000000 init_module
> 00000000         *UND*  00000000 printk
> 00000004 g     O .scommon       00000004 glob_int
> 
> 
> RELOCATION RECORDS FOR [.text]:
> OFFSET   TYPE              VALUE
> 00000008 R_MIPS_HI16       .rodata
> 0000000c R_MIPS_LO16       .rodata
> 00000010 R_MIPS_HI16       printk
> 00000014 R_MIPS_LO16       printk
> 00000028 R_MIPS_HI16       glob_int
> 0000002c R_MIPS_LO16       glob_int
> 00000040 R_MIPS_HI16       .rodata
> 00000044 R_MIPS_LO16       .rodata
> 00000048 R_MIPS_HI16       printk
> 0000004c R_MIPS_LO16       printk
> 
> 
> RELOCATION RECORDS FOR [.pdr]:
> OFFSET   TYPE              VALUE
> 00000000 R_MIPS_32         init_module
> 00000020 R_MIPS_32         cleanup_module
> 
> - ---
> 
> thanks for any hints.
> 
> btw: this issue is not related to the one i posted about before ("au1500mm 
> problems") - which is resolved already and was caused by a wrong 
> initialization of the dual PHY ethernet hardware.
> 
> bruno
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