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136 lines
3.6 KiB
136 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Implementation of various system calls for Linux/PowerPC |
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* |
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* Copyright (C) 1995-1996 Gary Thomas ([email protected]) |
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* |
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* Derived from "arch/i386/kernel/sys_i386.c" |
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* Adapted from the i386 version by Gary Thomas |
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* Modified by Cort Dougan ([email protected]) |
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* and Paul Mackerras ([email protected]). |
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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/PPC |
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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/syscalls.h> |
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#include <linux/mm.h> |
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#include <linux/fs.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/mman.h> |
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#include <linux/sys.h> |
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#include <linux/ipc.h> |
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#include <linux/utsname.h> |
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#include <linux/file.h> |
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#include <linux/personality.h> |
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#include <linux/uaccess.h> |
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#include <asm/syscalls.h> |
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#include <asm/time.h> |
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#include <asm/unistd.h> |
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#include <asm/asm-prototypes.h> |
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static inline long do_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 off, int shift) |
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{ |
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long ret = -EINVAL; |
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if (!arch_validate_prot(prot, addr)) |
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goto out; |
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if (shift) { |
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if (off & ((1 << shift) - 1)) |
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goto out; |
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off >>= shift; |
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} |
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ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off); |
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out: |
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return ret; |
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} |
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SYSCALL_DEFINE6(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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return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); |
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} |
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SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, |
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unsigned long, prot, unsigned long, flags, |
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unsigned long, fd, off_t, offset) |
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{ |
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return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); |
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} |
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#ifdef CONFIG_PPC32 |
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/* |
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* Due to some executables calling the wrong select we sometimes |
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* get wrong args. This determines how the args are being passed |
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* (a single ptr to them all args passed) then calls |
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* sys_select() with the appropriate args. -- Cort |
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*/ |
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int |
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ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp) |
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{ |
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if ( (unsigned long)n >= 4096 ) |
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{ |
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unsigned long __user *buffer = (unsigned long __user *)n; |
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if (!access_ok(buffer, 5*sizeof(unsigned long)) |
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|| __get_user(n, buffer) |
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|| __get_user(inp, ((fd_set __user * __user *)(buffer+1))) |
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|| __get_user(outp, ((fd_set __user * __user *)(buffer+2))) |
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|| __get_user(exp, ((fd_set __user * __user *)(buffer+3))) |
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|| __get_user(tvp, ((struct __kernel_old_timeval __user * __user *)(buffer+4)))) |
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return -EFAULT; |
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} |
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return sys_select(n, inp, outp, exp, tvp); |
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} |
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#endif |
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#ifdef CONFIG_PPC64 |
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long ppc64_personality(unsigned long personality) |
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{ |
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long ret; |
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if (personality(current->personality) == PER_LINUX32 |
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&& personality(personality) == PER_LINUX) |
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personality = (personality & ~PER_MASK) | PER_LINUX32; |
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ret = sys_personality(personality); |
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if (personality(ret) == PER_LINUX32) |
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ret = (ret & ~PER_MASK) | PER_LINUX; |
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return ret; |
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} |
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#endif |
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long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, |
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u32 len_high, u32 len_low) |
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{ |
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return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low, |
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(u64)len_high << 32 | len_low, advice); |
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} |
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SYSCALL_DEFINE0(switch_endian) |
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{ |
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struct thread_info *ti; |
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current->thread.regs->msr ^= MSR_LE; |
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/* |
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* Set TIF_RESTOREALL so that r3 isn't clobbered on return to |
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* userspace. That also has the effect of restoring the non-volatile |
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* GPRs, so we saved them on the way in here. |
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*/ |
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ti = current_thread_info(); |
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ti->flags |= _TIF_RESTOREALL; |
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return 0; |
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}
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