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0ad50c3896
This function is used by sparc, powerpc tile and arm64 for compat support. The patch adds a generic implementation with a wrapper for PowerPC to do the u32->int sign extension. The reason for a single patch covering powerpc, tile, sparc and arm64 is to keep it bisectable, otherwise kernel building may fail with mismatched function declarations. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [for tile] Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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/* Adjust unistd.h to provide 32-bit numbers and functions. */
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#define __SYSCALL_COMPAT
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#include <linux/compat.h>
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#include <linux/syscalls.h>
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#include <linux/kdev_t.h>
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <linux/uaccess.h>
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#include <linux/signal.h>
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#include <asm/syscalls.h>
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/*
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* Syscalls that take 64-bit numbers traditionally take them in 32-bit
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* "high" and "low" value parts on 32-bit architectures.
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* In principle, one could imagine passing some register arguments as
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* fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to
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* adapt the usual convention.
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*/
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long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high)
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{
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return sys_truncate(filename, ((loff_t)high << 32) | low);
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}
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long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high)
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{
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return sys_ftruncate(fd, ((loff_t)high << 32) | low);
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}
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long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
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u32 dummy, u32 low, u32 high)
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{
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return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
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}
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long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
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u32 dummy, u32 low, u32 high)
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{
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return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
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}
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long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len)
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{
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return sys_lookup_dcookie(((loff_t)high << 32) | low, buf, len);
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}
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long compat_sys_sync_file_range2(int fd, unsigned int flags,
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u32 offset_lo, u32 offset_hi,
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u32 nbytes_lo, u32 nbytes_hi)
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{
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return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
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((loff_t)nbytes_hi << 32) | nbytes_lo,
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flags);
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}
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long compat_sys_fallocate(int fd, int mode,
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u32 offset_lo, u32 offset_hi,
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u32 len_lo, u32 len_hi)
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{
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return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
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((loff_t)len_hi << 32) | len_lo);
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}
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/* Provide the compat syscall number to call mapping. */
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#undef __SYSCALL
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#define __SYSCALL(nr, call) [nr] = (call),
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/* See comments in sys.c */
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#define compat_sys_fadvise64_64 sys32_fadvise64_64
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#define compat_sys_readahead sys32_readahead
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/* Call the assembly trampolines where necessary. */
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#define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
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#define sys_clone _sys_clone
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/*
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* Note that we can't include <linux/unistd.h> here since the header
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* guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
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*/
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void *compat_sys_call_table[__NR_syscalls] = {
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[0 ... __NR_syscalls-1] = sys_ni_syscall,
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#include <asm/unistd.h>
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};
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