99 строки
2.5 KiB
C
99 строки
2.5 KiB
C
/*
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* arch/xtensa/kernel/syscall.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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* Copyright (C) 2000 Silicon Graphics, Inc.
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* Copyright (C) 1995 - 2000 by Ralf Baechle
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*
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* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
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* Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
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* Chris Zankel <chris@zankel.net>
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* Kevin Chea
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*
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*/
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#include <linux/uaccess.h>
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#include <asm/syscall.h>
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#include <asm/unistd.h>
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#include <linux/linkage.h>
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#include <linux/stringify.h>
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#include <linux/errno.h>
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#include <linux/syscalls.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/mman.h>
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#include <linux/sched/mm.h>
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#include <linux/shm.h>
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typedef void (*syscall_t)(void);
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syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {
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[0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall,
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#define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol,
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#include <uapi/asm/unistd.h>
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};
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#define COLOUR_ALIGN(addr, pgoff) \
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((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \
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(((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
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asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
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{
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unsigned long ret;
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long err;
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err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
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if (err)
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return err;
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return (long)ret;
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}
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asmlinkage long xtensa_fadvise64_64(int fd, int advice,
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unsigned long long offset, unsigned long long len)
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{
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return sys_fadvise64_64(fd, offset, len, advice);
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}
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#ifdef CONFIG_MMU
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct vm_area_struct *vmm;
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if (flags & MAP_FIXED) {
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/* We do not accept a shared mapping if it would violate
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* cache aliasing constraints.
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*/
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if ((flags & MAP_SHARED) &&
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((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
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return -EINVAL;
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return addr;
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}
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if (len > TASK_SIZE)
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return -ENOMEM;
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if (!addr)
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addr = TASK_UNMAPPED_BASE;
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if (flags & MAP_SHARED)
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addr = COLOUR_ALIGN(addr, pgoff);
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else
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addr = PAGE_ALIGN(addr);
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for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
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/* At this point: (!vmm || addr < vmm->vm_end). */
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if (TASK_SIZE - len < addr)
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return -ENOMEM;
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if (!vmm || addr + len <= vm_start_gap(vmm))
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return addr;
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addr = vmm->vm_end;
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if (flags & MAP_SHARED)
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addr = COLOUR_ALIGN(addr, pgoff);
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}
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}
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#endif
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