From: Arnd Bergmann <arnd@arndb.de>
To: Jeff Dike <jdike@addtoit.com>
Subject: Re: [PATCH] introduce kernel_execve function to replace __KERNEL_SYSCALLS__
Date: Tue, 22 Aug 2006 17:13:39 +0200
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Cc: Bj?rn Steinbrink <B.Steinbrink@gmx.de>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Paul Mackerras <paulus@samba.org>,
       Russell King <rmk+lkml@arm.linux.org.uk>, Andrew Morton <akpm@osdl.org>,
       rusty@rustcorp.com.au, linux-kernel@vger.kernel.org,
       linux-arch@vger.kernel.org
References: <20060819073031.GA25711@atjola.homenet> <200608221207.00344.arnd@arndb.de> <20060822133945.GA3813@ccure.user-mode-linux.org>
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On Tuesday 22 August 2006 15:39, Jeff Dike wrote:
> You're contemplating changing UML to do, e.g.
> ????????syscall(NR_write, fd, buf, len)
> instead of the current
> ????????write(fd, buf,len)
> ?
> 
> That hardly seems like an improvement and it seems fairly unnecessary.
> 
No, that's not what I was referring to. I was thinking of the calls:

arch/um/os-Linux/process.c:inline _syscall0(pid_t, getpid)
arch/um/os-Linux/sys-i386/tls.c:static _syscall1(int, get_thread_area, user_desc_t *, u_info);
arch/um/os-Linux/tls.c:static _syscall1(int, get_thread_area, user_desc_t *, u_info);
arch/um/os-Linux/tls.c:static _syscall1(int, set_thread_area, user_desc_t *, u_info);
arch/um/sys-i386/unmap.c:static inline _syscall2(int,munmap,void *,start,size_t,len)
arch/um/sys-i386/unmap.c:static inline _syscall6(void *,mmap2,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)
arch/um/sys-x86_64/unmap.c:static inline _syscall2(int,munmap,void *,start,size_t,len)
arch/um/sys-x86_64/unmap.c:static inline _syscall6(void *,mmap,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)

Are these for calling the host OS or calling the UML kernel?
If they are for the host, they can be implemented using syscall(),
otherwise by calling the sys_* functions directly.

	Arnd <><
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