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https://github.com/torvalds/linux
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baed7fc9b5
Add a generic implementation of the ipc demultiplexer syscall. Except for s390 and sparc64 all implementations of the sys_ipc are nearly identical. There are slight differences in the types of the parameters, where mips and powerpc as the only 64-bit architectures with sys_ipc use unsigned long for the "third" argument as it gets casted to a pointer later, while it traditionally is an "int" like most other paramters. frv goes even further and uses unsigned long for all parameters execept for "ptr" which is a pointer type everywhere. The change from int to unsigned long for "third" and back to "int" for the others on frv should be fine due to the in-register calling conventions for syscalls (we already had a similar issue with the generic sys_ptrace), but I'd prefer to have the arch maintainers looks over this in details. Except for that h8300, m68k and m68knommu lack an impplementation of the semtimedop sub call which this patch adds, and various architectures have gets used - at least on i386 it seems superflous as the compat code on x86-64 and ia64 doesn't even bother to implement it. [akpm@linux-foundation.org: add sys_ipc to sys_ni.c] Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Reviewed-by: H. Peter Anvin <hpa@zytor.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: James Morris <jmorris@namei.org> Cc: Andreas Schwab <schwab@linux-m68k.org> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
93 lines
2 KiB
C
93 lines
2 KiB
C
/*
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* linux/arch/m68knommu/kernel/sys_m68k.c
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/m68k
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/ipc.h>
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#include <linux/fs.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/cachectl.h>
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#include <asm/traps.h>
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#include <asm/cacheflush.h>
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#include <asm/unistd.h>
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/* sys_cacheflush -- flush (part of) the processor cache. */
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asmlinkage int
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sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
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{
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flush_cache_all();
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return(0);
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}
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asmlinkage int sys_getpagesize(void)
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{
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return PAGE_SIZE;
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}
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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*/
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int kernel_execve(const char *filename, char *const argv[], char *const envp[])
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{
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register long __res asm ("%d0") = __NR_execve;
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register long __a asm ("%d1") = (long)(filename);
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register long __b asm ("%d2") = (long)(argv);
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register long __c asm ("%d3") = (long)(envp);
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asm volatile ("trap #0" : "+d" (__res)
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: "d" (__a), "d" (__b), "d" (__c));
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return __res;
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}
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asmlinkage unsigned long sys_get_thread_area(void)
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{
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return current_thread_info()->tp_value;
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}
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asmlinkage int sys_set_thread_area(unsigned long tp)
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{
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current_thread_info()->tp_value = tp;
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return 0;
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}
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/* This syscall gets its arguments in A0 (mem), D2 (oldval) and
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D1 (newval). */
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asmlinkage int
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sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
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unsigned long __user * mem)
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{
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struct mm_struct *mm = current->mm;
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unsigned long mem_value;
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down_read(&mm->mmap_sem);
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mem_value = *mem;
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if (mem_value == oldval)
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*mem = newval;
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up_read(&mm->mmap_sem);
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return mem_value;
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}
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asmlinkage int sys_atomic_barrier(void)
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{
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/* no code needed for uniprocs */
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return 0;
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}
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