diff options
Diffstat (limited to 'arch/powerpc/kernel/syscalls.c')
-rw-r--r-- | arch/powerpc/kernel/syscalls.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c new file mode 100644 index 0000000000..68ebb23a5a --- /dev/null +++ b/arch/powerpc/kernel/syscalls.c @@ -0,0 +1,127 @@ +// 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> + +static long do_mmap2(unsigned long addr, size_t len, + unsigned long prot, unsigned long flags, + unsigned long fd, unsigned long off, int shift) +{ + if (!arch_validate_prot(prot, addr)) + return -EINVAL; + + if (!IS_ALIGNED(off, 1 << shift)) + return -EINVAL; + + return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift); +} + +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); +} + +#ifdef CONFIG_COMPAT +COMPAT_SYSCALL_DEFINE6(mmap2, + unsigned long, addr, size_t, len, + unsigned long, prot, unsigned long, flags, + unsigned long, fd, unsigned long, off_4k) +{ + return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12); +} +#endif + +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_PPC64 +static long do_ppc64_personality(unsigned long personality) +{ + long ret; + + if (personality(current->personality) == PER_LINUX32 + && personality(personality) == PER_LINUX) + personality = (personality & ~PER_MASK) | PER_LINUX32; + ret = ksys_personality(personality); + if (personality(ret) == PER_LINUX32) + ret = (ret & ~PER_MASK) | PER_LINUX; + return ret; +} + +SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality) +{ + return do_ppc64_personality(personality); +} + +#ifdef CONFIG_COMPAT +COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality) +{ + return do_ppc64_personality(personality); +} +#endif /* CONFIG_COMPAT */ +#endif /* CONFIG_PPC64 */ + +SYSCALL_DEFINE6(ppc_fadvise64_64, + int, fd, int, advice, u32, offset_high, u32, offset_low, + u32, len_high, u32, len_low) +{ + return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low), + merge_64(len_high, 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; +} |