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079a96ae38
If the SHMLBA definition for a native task differs from the definition for a compat task, the do_shmat() function would need to handle both. This patch introduces COMPAT_SHMLBA, which is used by the compat shmat syscall when calling the ipc code and allows architectures such as AArch64 (where the native SHMLBA is 64k but the compat (AArch32) definition is 16k) to provide the correct semantics for compat IPC system calls. Cc: David S. Miller <davem@davemloft.net> Cc: Chris Zankel <chris@zankel.net> Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/*
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* arch/xtensa/kernel/syscall.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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* Copyright (C) 2000 Silicon Graphics, Inc.
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* Copyright (C) 1995 - 2000 by Ralf Baechle
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*
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* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
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* Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
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* Chris Zankel <chris@zankel.net>
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* Kevin Chea
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*
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*/
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#include <asm/uaccess.h>
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#include <asm/syscall.h>
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#include <asm/unistd.h>
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#include <linux/linkage.h>
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#include <linux/stringify.h>
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#include <linux/errno.h>
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#include <linux/syscalls.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/mman.h>
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#include <linux/shm.h>
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typedef void (*syscall_t)(void);
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syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {
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[0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall,
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#undef __SYSCALL
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#define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol,
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#undef _XTENSA_UNISTD_H
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#undef __KERNEL_SYSCALLS__
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#include <asm/unistd.h>
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};
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asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
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{
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unsigned long ret;
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long err;
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err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
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if (err)
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return err;
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return (long)ret;
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}
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asmlinkage long xtensa_fadvise64_64(int fd, int advice, unsigned long long offset, unsigned long long len)
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{
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return sys_fadvise64_64(fd, offset, len, advice);
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}
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