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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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411d9475cf
Using the ksys_ftruncate() wrapper allows us to get rid of in-kernel calls to the sys_ftruncate() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_ftruncate(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
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* sys_ppc32.c: Conversion between 32bit and 64bit native syscalls.
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*
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* Copyright (C) 2001 IBM
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
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*
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* These routines maintain argument size conversion between 32bit and 64bit
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* environment.
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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; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/file.h>
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#include <linux/signal.h>
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#include <linux/resource.h>
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#include <linux/times.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/poll.h>
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#include <linux/personality.h>
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#include <linux/stat.h>
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#include <linux/mman.h>
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#include <linux/in.h>
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#include <linux/syscalls.h>
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#include <linux/unistd.h>
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#include <linux/sysctl.h>
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#include <linux/binfmts.h>
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#include <linux/security.h>
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#include <linux/compat.h>
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#include <linux/ptrace.h>
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#include <linux/elf.h>
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#include <linux/ipc.h>
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#include <linux/slab.h>
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#include <asm/ptrace.h>
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#include <asm/types.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/time.h>
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#include <asm/mmu_context.h>
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#include <asm/ppc-pci.h>
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#include <asm/syscalls.h>
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#include <asm/switch_to.h>
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asmlinkage long ppc32_select(u32 n, compat_ulong_t __user *inp,
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compat_ulong_t __user *outp, compat_ulong_t __user *exp,
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compat_uptr_t tvp_x)
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{
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/* sign extend n */
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return compat_sys_select((int)n, inp, outp, exp, compat_ptr(tvp_x));
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}
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unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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/* This should remain 12 even if PAGE_SIZE changes */
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return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
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}
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/*
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* long long munging:
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* The 32 bit ABI passes long longs in an odd even register pair.
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*/
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compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
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u32 reg6, u32 poshi, u32 poslo)
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{
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return sys_pread64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
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}
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compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count,
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u32 reg6, u32 poshi, u32 poslo)
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{
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return sys_pwrite64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
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}
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compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offhi, u32 offlo, u32 count)
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{
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return sys_readahead(fd, ((loff_t)offhi << 32) | offlo, count);
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}
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asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
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unsigned long high, unsigned long low)
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{
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return sys_truncate(path, (high << 32) | low);
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}
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asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
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u32 lenhi, u32 lenlo)
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{
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return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
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((loff_t)lenhi << 32) | lenlo);
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}
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asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long high,
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unsigned long low)
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{
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return ksys_ftruncate(fd, (high << 32) | low);
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}
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long ppc32_fadvise64(int fd, u32 unused, u32 offset_high, u32 offset_low,
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size_t len, int advice)
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{
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return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, len,
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advice);
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}
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asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags,
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unsigned offset_hi, unsigned offset_lo,
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unsigned nbytes_hi, unsigned nbytes_lo)
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{
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loff_t offset = ((loff_t)offset_hi << 32) | offset_lo;
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loff_t nbytes = ((loff_t)nbytes_hi << 32) | nbytes_lo;
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return sys_sync_file_range(fd, offset, nbytes, flags);
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}
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