On Wed, Dec 26, 2012 at 1:04 PM, Niroj Pokhrel <nirojpokh...@gmail.com>wrote:
> Hi, > I have written a system call and build it with kernel for Arm > architecture. However, I'm confused to use it to call it from the user > space. As it is in x86, where we can simply call by using sycall() function > and the return value is returned by the syscal() itself. > In Arm, I tried to write an assembly language program and was able to call > the system call using the assembly code but what I'm care to show us how you called system call in assembly in ARM? > confused is how to call this function using C program. I tried using > inline assembly but it didn't work. Further, if I can implement it using > inline assembly then return value will be in r0 and how can I move this > value to the user variable. > Thanking you in advance. > > arch/arm/kernel/entry-common.S (and kernel/calls.S) pair up together to implement the pre-syscall and post-syscall wrapper as you have asked. perhaps u can try to understand the code first? > -- > Niroj Pokhrel > Software Engineer, > Samsung India Software Operations > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > -- Regards, Peter Teoh
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