Here is a loadable kernel module for HTC Sensation XL (runnymede-
crc-2.6.35).
/*
* mydebug.c
* System Call sys_open dubugging
*/
#include <linux/kernel.h> /* Needed for KERN_INFO */
#include <linux/module.h> /* Needed by all modules */
#include <linux/init.h> /* Needed for macros */
#include <asm/unistd.h>
#include <linux/linkage.h>
#include <generated/autoconf.h>
#include <linux/in.h>
#include <linux/init_task.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/mm.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/syscalls.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/version.h>
asmlinkage ssize_t (*orig_open)(const char *pathname, int flags);
asmlinkage ssize_t hooked_open(const char *pathname, int flags)
{
printk(KERN_INFO "SYS_OPEN: %s\n", pathname);
return orig_open(pathname, flags);
}
static int __init root_start(void)
{
unsigned long sys_addr = 0xc003b104; /* System.map */
unsigned long *sys_call_table= (unsigned long *)sys_addr;
orig_open = sys_call_table[__NR_open];
sys_call_table[__NR_open] = hooked_open;
return 0;
}
static void __exit root_stop(void)
{
unsigned long sys_addr = 0xc003b104;
unsigned long *sys_call_table= (unsigned long *)sys_addr;
sys_call_table[__NR_open] = &orig_open;
}
module_init(root_start);
module_exit(root_stop);
-------
When I buid it, the error shows below,
make -C /home/scott/runnymede-crc-2.6.35/ M=`pwd` ARCH=arm
CROSS_COMPILE=~/android-ndk-r7b/toolchains/arm-linux-androideabi-4.4.3/
prebuilt/linux-x86/bin/arm-linux-androideabi- modules
make[1]: Entering directory `<home>/runnymede-crc-2.6.35'
CC [M] /<home>/workspace/debugkit/mydebug.o
cc1: warnings being treated as errors
/<home>/workspace/debugkit/mydebug.c: In function 'root_start':
/<home>/workspace/debugkit/mydebug.c:44: error: assignment makes
pointer from integer without a cast
/<home>/workspace/debugkit/mydebug.c:45: error: assignment makes
integer from pointer without a cast
/<home>/workspace/debugkit/mydebug.c: In function 'root_stop':
/<home>/workspace/debugkit/mydebug.c:55: error: assignment makes
integer from pointer without a cast
make[2]: *** [/<home>/workspace/debugkit/mydebug.o] Error 1
make[1]: *** [_module_/<home>/workspace/debugkit] Error 2
make[1]: Leaving directory `/home/scott/runnymede-crc-2.6.35'
make: *** [default] Error 2
Anyone can give me a help for it?
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