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thanks for the tip - i have that defined in hello_module.c
bruno
On Thursday 17 April 2003 16:59, you wrote:
> 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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