[thomas_fogh]

Has anyone tried making a kernel module with proc entry?
I get a compilation error for one of the arm-elf include files when I include "proc_fs.h".

[martinb]

Originally Posted by thomas_fogh Has anyone tried making a kernel module with proc entry? I get a compilation error for one of the arm-elf include files when I include "proc_fs.h".

what crosscompiler do you use?
if you send me the source i can try to compile it
(i have build some other crosscompilers)

[thomas_fogh]

I'm using:
http://www.uclinux.org/pub/uClinux/a...ls-20030314.sh

Thanks!
BR, Thomas


test_proc.c:

#include <linux>
#include <linux>
#include <linux>
#include <linux>
#include <linux>
#include <linux>
#include <linux>
#include <linux>

static char procname[] = "test_proc";
static struct proc_dir_entry *proc_entry;

int test_read_proc(char *buf, char **start, off_t off,
                   int count, int *eof, void *data)
{
  int len = 0;

  len += sprintf(buf+len, "Testing..1..2..3\n");

  return len;
}

int test_write_proc(struct file *file, const char *buffer,
                    unsigned long count, void *data)
{
}

int init_module()
{
  proc_entry = create_proc_entry(procname, 0666, NULL);
  if (proc_entry != NULL) {
    proc_entry->read_proc  = test_read_proc;
    proc_entry->write_proc = test_write_proc;
  } else {
    printk("<1>test_proc: Couldn't create proc entry!");
    return -ENOMEM;
  }
  return 0;
}

void cleanup_module()
{
  remove_proc_entry(procname, NULL);
}

MODULE_LICENSE("GPL");

And Makefile:

#Setting the include dir
IDIR=	.
#IDIR+=  -I/usr/src/local/arm-elf/include
#Setting compiler & flags
CC=	arm-elf-gcc
CFLAGS=	-I$(IDIR) -DMODULE -D__KERNEL__ -D__uClinux__ -mtune=arm7tdmi -O2
LDFLAGS=-Wl,-elf2flt="-s262144"
#Setting the object output dir
ODIR=	obj
#Setting the library dir
LDIR=
#Adding libs
LIBS=

#Setting dependencies
_DEPS=
DEPS =	$(patsubst %,$(IDIR)/%,$(_DEPS))

#Specifying objects
SRCC  =	test_proc.c
SRCCPP=	

OBJ =	$(patsubst %.c,$(ODIR)/%.o,$(SRCC))
OBJ+=	$(patsubst %.cpp,$(ODIR)/%.o,$(SRCCPP))

#Setting rules for object files
$(ODIR)/%.o: %.c $(DEPS)
	@mkdir -p $(ODIR)
	@echo Compiling____$^
	@$(CC) -c -o $@ $< $(CFLAGS)

.PHONY: clean

clean:
	@echo Cleaning...
	@rm -f $(ODIR)/*.o *~

[martinb]

i am missing all the includes?

can you first be sure it will compilewith gcc
(without cross compile)

if you got a working version for gcc and it will not crosscompile please provide me the source again

[thomas_fogh]

This is compiling on the "normal" gcc, but not the arm-elf-gcc.
The includes were missing because HTML was on. Sorry

daemon_mod.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>

static char procname[] = "torrents";
static struct proc_dir_entry *proc_entry;

int torrent_read_proc(char *buf, char **start, off_t off,
                      int count, int *eof, void *data);
int torrent_write_proc(struct file *file, const char *buffer,
                       unsigned long count, void *data);
int init_module(void);
void cleanup_module(void);

int torrent_read_proc(char *buf, char **start, off_t off,
                      int count, int *eof, void *data)
{
  int len = 0;

  len += sprintf(buf+len, "Testing..1..2..3\n");

  return len;
}

int torrent_write_proc(struct file *file, const char *buffer,
                       unsigned long count, void *data)
{
  return 0;
}

int init_module(void)
{
  proc_entry = create_proc_entry(procname, 0666, NULL);
  if (proc_entry != NULL) {
    proc_entry->read_proc  = torrent_read_proc;
    proc_entry->write_proc = torrent_write_proc;
  } else {
    printk("<1>torrent_daemon_kiss: Couldn't create proc entry!");
    return -ENOMEM;
  }
  return 0;
}

void cleanup_module(void)
{
  remove_proc_entry(procname, NULL);
}

MODULE_LICENSE("GPL");

Makefile:

TARGET  := daemon_mod
WARN    := -W -Wall -Wstrict-prototypes -Wmissing-prototypes
#INCLUDE := -isystem /lib/modules/`uname -r`/build/include
INCLUDE := -isystem /usr/local/arm-elf/include
CFLAGS  := -O2 -DMODULE -D__KERNEL__ ${WARN} ${INCLUDE}
#CC      := gcc
CC      := arm-elf-gcc

${TARGET}.o: ${TARGET}.c

.PHONY: clean

clean:
	rm -f ${TARGET}.o *~

errors:

arm-elf-gcc -O2 -DMODULE -D__KERNEL__ -W -Wall -Wstrict-prototypes -Wmissing-prototypes -isystem /usr/local/arm-elf/include   -c -o daemon_mod.o daemon_mod.c
In file included from /usr/local/arm-elf/include/linux/mm.h:26,
                 from /usr/local/arm-elf/include/linux/slab.h:14,
                 from /usr/local/arm-elf/include/linux/proc_fs.h:5,
                 from daemon_mod.c:3:
/usr/local/arm-elf/include/asm/pgtable.h:180: asm-generic/pgtable.h: No such file or directory
make: *** [daemon_mod.o] Error 1

[martinb]

Originally Posted by thomas_fogh This is compiling on the "normal" gcc, but not the arm-elf-gcc. ..

if i do:
arm-elf-gcc -O0 -DMODULE -D__KERNEL__ -DNO_MM -W -Wall -c -o daemon_mod.o test_proc.c -march=armv4 -msoft-float -I/apps/stage2_source/uClinux-2.4/include/


i get the folowing output

arm-elf-gcc -O0 -DMODULE -D__KERNEL__ -DNO_MM -W -Wall -c -o daemon_mod.o test_proc.c -march=armv4 -msoft-float -I/apps/stage2_source/uClinux-2.4/include/
In file included from /apps/stage2_source/uClinux-2.4/include/linux/list.h:6,
                 from /apps/stage2_source/uClinux-2.4/include/linux/module.h:12,
                 from test_proc.c:1:
/apps/stage2_source/uClinux-2.4/include/linux/prefetch.h: In function `prefetch':
/apps/stage2_source/uClinux-2.4/include/linux/prefetch.h:43: warning: unused parameter `x'
/apps/stage2_source/uClinux-2.4/include/linux/prefetch.h: In function `prefetchw':
/apps/stage2_source/uClinux-2.4/include/linux/prefetch.h:48: warning: unused parameter `x'
In file included from /apps/stage2_source/uClinux-2.4/include/linux/fs.h:12,
                 from /apps/stage2_source/uClinux-2.4/include/linux/capability.h:17,
                 from /apps/stage2_source/uClinux-2.4/include/linux/binfmts.h:5,
                 from /apps/stage2_source/uClinux-2.4/include/linux/sched.h:9,
                 from /apps/stage2_source/uClinux-2.4/include/linux/mm.h:4,
                 from /apps/stage2_source/uClinux-2.4/include/linux/slab.h:14,
                 from /apps/stage2_source/uClinux-2.4/include/linux/proc_fs.h:5,
                 from test_proc.c:3:
/apps/stage2_source/uClinux-2.4/include/linux/wait.h: In function `__remove_wait_queue':
/apps/stage2_source/uClinux-2.4/include/linux/wait.h:223: warning: unused parameter `head'
In file included from /apps/stage2_source/uClinux-2.4/include/linux/string.h:19,
                 from /apps/stage2_source/uClinux-2.4/include/linux/fs.h:23,
                 from /apps/stage2_source/uClinux-2.4/include/linux/capability.h:17,
                 from /apps/stage2_source/uClinux-2.4/include/linux/binfmts.h:5,
                 from /apps/stage2_source/uClinux-2.4/include/linux/sched.h:9,
                 from /apps/stage2_source/uClinux-2.4/include/linux/mm.h:4,
                 from /apps/stage2_source/uClinux-2.4/include/linux/slab.h:14,
                 from /apps/stage2_source/uClinux-2.4/include/linux/proc_fs.h:5,
                 from test_proc.c:3:
/apps/stage2_source/uClinux-2.4/include/asm/string.h: At top level:
/apps/stage2_source/uClinux-2.4/include/asm/string.h:16: warning: conflicting types for built-in function `memcpy'
/apps/stage2_source/uClinux-2.4/include/asm/string.h:26: warning: conflicting types for built-in function `memset'
In file included from /apps/stage2_source/uClinux-2.4/include/linux/fs.h:23,
                 from /apps/stage2_source/uClinux-2.4/include/linux/capability.h:17,
                 from /apps/stage2_source/uClinux-2.4/include/linux/binfmts.h:5,
                 from /apps/stage2_source/uClinux-2.4/include/linux/sched.h:9,
                 from /apps/stage2_source/uClinux-2.4/include/linux/mm.h:4,
                 from /apps/stage2_source/uClinux-2.4/include/linux/slab.h:14,
                 from /apps/stage2_source/uClinux-2.4/include/linux/proc_fs.h:5,
                 from test_proc.c:3:
/apps/stage2_source/uClinux-2.4/include/linux/string.h:79: warning: conflicting types for built-in function `memcmp'
In file included from /apps/stage2_source/uClinux-2.4/include/linux/sched.h:26,
                 from /apps/stage2_source/uClinux-2.4/include/linux/mm.h:4,
                 from /apps/stage2_source/uClinux-2.4/include/linux/slab.h:14,
                 from /apps/stage2_source/uClinux-2.4/include/linux/proc_fs.h:5,
                 from test_proc.c:3:
/apps/stage2_source/uClinux-2.4/include/linux/signal.h: In function `sigorsets':
/apps/stage2_source/uClinux-2.4/include/linux/signal.h:108: warning: comparison of unsigned expression < 0 is always false
/apps/stage2_source/uClinux-2.4/include/linux/signal.h: In function `sigandsets':
/apps/stage2_source/uClinux-2.4/include/linux/signal.h:111: warning: comparison of unsigned expression < 0 is always false
/apps/stage2_source/uClinux-2.4/include/linux/signal.h: In function `signandsets':
/apps/stage2_source/uClinux-2.4/include/linux/signal.h:114: warning: comparison of unsigned expression < 0 is always false
/apps/stage2_source/uClinux-2.4/include/linux/signal.h: In function `signotset':
/apps/stage2_source/uClinux-2.4/include/linux/signal.h:140: warning: comparison of unsigned expression < 0 is always false
In file included from /apps/stage2_source/uClinux-2.4/include/linux/mm.h:4,
                 from /apps/stage2_source/uClinux-2.4/include/linux/slab.h:14,
                 from /apps/stage2_source/uClinux-2.4/include/linux/proc_fs.h:5,
                 from test_proc.c:3:
/apps/stage2_source/uClinux-2.4/include/linux/sched.h: In function `task_unlock':
/apps/stage2_source/uClinux-2.4/include/linux/sched.h:957: warning: unused parameter `p'
In file included from /apps/stage2_source/uClinux-2.4/include/asm/pgtable.h:153,
                 from /apps/stage2_source/uClinux-2.4/include/linux/mm.h:25,
                 from /apps/stage2_source/uClinux-2.4/include/linux/slab.h:14,
                 from /apps/stage2_source/uClinux-2.4/include/linux/proc_fs.h:5,
                 from test_proc.c:3:
/apps/stage2_source/uClinux-2.4/include/asm/proc/pgtable.h: In function `__mk_pmd':
/apps/stage2_source/uClinux-2.4/include/asm/proc/pgtable.h:51: warning: unused parameter `ptep'
/apps/stage2_source/uClinux-2.4/include/asm/proc/pgtable.h:51: warning: unused parameter `prot'
/apps/stage2_source/uClinux-2.4/include/asm/proc/pgtable.h: In function `pmd_page':
/apps/stage2_source/uClinux-2.4/include/asm/proc/pgtable.h:72: warning: unused parameter `pmd'
In file included from /apps/stage2_source/uClinux-2.4/include/linux/slab.h:14,
                 from /apps/stage2_source/uClinux-2.4/include/linux/proc_fs.h:5,
                 from test_proc.c:3:
/apps/stage2_source/uClinux-2.4/include/linux/mm.h: In function `__vma_unlink':
/apps/stage2_source/uClinux-2.4/include/linux/mm.h:527: warning: unused parameter `mm'
/apps/stage2_source/uClinux-2.4/include/linux/mm.h:527: warning: unused parameter `vma'
/apps/stage2_source/uClinux-2.4/include/linux/mm.h:527: warning: unused parameter `prev'
/apps/stage2_source/uClinux-2.4/include/linux/mm.h: In function `can_vma_merge':
/apps/stage2_source/uClinux-2.4/include/linux/mm.h:537: warning: unused parameter `vma'
/apps/stage2_source/uClinux-2.4/include/linux/mm.h:537: warning: unused parameter `vm_flags'
test_proc.c: In function `torrent_read_proc':
test_proc.c:15: warning: unused parameter `start'
test_proc.c:15: warning: unused parameter `off'
test_proc.c:16: warning: unused parameter `count'
test_proc.c:16: warning: unused parameter `eof'
test_proc.c:16: warning: unused parameter `data'
test_proc.c: In function `torrent_write_proc':
test_proc.c:25: warning: unused parameter `file'
test_proc.c:25: warning: unused parameter `buffer'
test_proc.c:26: warning: unused parameter `count'
test_proc.c:26: warning: unused parameter `data'

but it does compile
(sorry im a linux noob so i dont know if the output is working)

[thomas_fogh]

Ok, thanks!
I'll try that!

BR, Thomas

[thomas_fogh]

Hi Martin,

Just using the same flags didn't work. I had to use the uClinux sources from the KiSS GPL.zip.
Now it compiles! And the module works!

Thank you for your help!

BR, Thomas


Maybe someone should update the howto page.

1. Get and run

   http://www.uclinux.org/pub/uClinux/arm-elf-tools/arm-elf-tools-20030314.sh

2. Unpack the uClinux part of the GPL.zip.
3. Use following flags for kernel modules:
   -O2 -DMODULE -D__KERNEL__ -D__uClinux__ -DNO_MM -W -Wall -march=armv4 -msoft-float
4. Add following flags to the ones already specified for userspace programs (just in case...):
   -DNO_MM -msoft-float

What we really need is a wiki we can update as we get more information...

[martinb]

Originally Posted by thomas_fogh .. What we really need is a wiki we can update as we get more information...

I agree with the wiki
what does hi-jack think of a wiki ?

the forum is not the place to maintain howto's because it change to fast