| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Implementation of various system calls for Linux/PowerPC |
| * |
| * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| * |
| * Derived from "arch/i386/kernel/sys_i386.c" |
| * Adapted from the i386 version by Gary Thomas |
| * Modified by Cort Dougan (cort@cs.nmt.edu) |
| * and Paul Mackerras (paulus@cs.anu.edu.au). |
| * |
| * This file contains various random system calls that |
| * have a non-standard calling sequence on the Linux/PPC |
| * platform. |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/sched.h> |
| #include <linux/syscalls.h> |
| #include <linux/mm.h> |
| #include <linux/fs.h> |
| #include <linux/smp.h> |
| #include <linux/sem.h> |
| #include <linux/msg.h> |
| #include <linux/shm.h> |
| #include <linux/stat.h> |
| #include <linux/mman.h> |
| #include <linux/sys.h> |
| #include <linux/ipc.h> |
| #include <linux/utsname.h> |
| #include <linux/file.h> |
| #include <linux/personality.h> |
| |
| #include <linux/uaccess.h> |
| #include <asm/syscalls.h> |
| #include <asm/time.h> |
| #include <asm/unistd.h> |
| #include <asm/asm-prototypes.h> |
| |
| static inline long do_mmap2(unsigned long addr, size_t len, |
| unsigned long prot, unsigned long flags, |
| unsigned long fd, unsigned long off, int shift) |
| { |
| long ret = -EINVAL; |
| |
| if (!arch_validate_prot(prot, addr)) |
| goto out; |
| |
| if (shift) { |
| if (off & ((1 << shift) - 1)) |
| goto out; |
| off >>= shift; |
| } |
| |
| ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off); |
| out: |
| return ret; |
| } |
| |
| SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len, |
| unsigned long, prot, unsigned long, flags, |
| unsigned long, fd, unsigned long, pgoff) |
| { |
| return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); |
| } |
| |
| SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, |
| unsigned long, prot, unsigned long, flags, |
| unsigned long, fd, off_t, offset) |
| { |
| return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); |
| } |
| |
| #ifdef CONFIG_PPC32 |
| /* |
| * Due to some executables calling the wrong select we sometimes |
| * get wrong args. This determines how the args are being passed |
| * (a single ptr to them all args passed) then calls |
| * sys_select() with the appropriate args. -- Cort |
| */ |
| int |
| ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp) |
| { |
| if ( (unsigned long)n >= 4096 ) |
| return sys_old_select((void __user *)n); |
| |
| return sys_select(n, inp, outp, exp, tvp); |
| } |
| #endif |
| |
| #ifdef CONFIG_PPC64 |
| long ppc64_personality(unsigned long personality) |
| { |
| long ret; |
| |
| if (personality(current->personality) == PER_LINUX32 |
| && personality(personality) == PER_LINUX) |
| personality = (personality & ~PER_MASK) | PER_LINUX32; |
| ret = sys_personality(personality); |
| if (personality(ret) == PER_LINUX32) |
| ret = (ret & ~PER_MASK) | PER_LINUX; |
| return ret; |
| } |
| #endif |
| |
| long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, |
| u32 len_high, u32 len_low) |
| { |
| return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low, |
| (u64)len_high << 32 | len_low, advice); |
| } |
| |
| SYSCALL_DEFINE0(switch_endian) |
| { |
| struct thread_info *ti; |
| |
| regs_set_return_msr(current->thread.regs, |
| current->thread.regs->msr ^ MSR_LE); |
| |
| /* |
| * Set TIF_RESTOREALL so that r3 isn't clobbered on return to |
| * userspace. That also has the effect of restoring the non-volatile |
| * GPRs, so we saved them on the way in here. |
| */ |
| ti = current_thread_info(); |
| ti->flags |= _TIF_RESTOREALL; |
| |
| return 0; |
| } |