| 1 | |
| 2 | * arch/xtensa/kernel/syscall.c
|
| 3 | *
|
| 4 | * This file is subject to the terms and conditions of the GNU General Public
|
| 5 | * License. See the file "COPYING" in the main directory of this archive
|
| 6 | * for more details.
|
| 7 | *
|
| 8 | * Copyright (C) 2001 - 2005 Tensilica Inc.
|
| 9 | * Copyright (C) 2000 Silicon Graphics, Inc.
|
| 10 | * Copyright (C) 1995 - 2000 by Ralf Baechle
|
| 11 | *
|
| 12 | * Joe Taylor <[email protected], [email protected]>
|
| 13 | * Marc Gauthier <[email protected], [email protected]>
|
| 14 | * Chris Zankel <[email protected]>
|
| 15 | * Kevin Chea
|
| 16 | *
|
| 17 |
|
| 18 | #include <linux/uaccess.h>
|
| 19 | #include <asm/syscall.h>
|
| 20 | #include <linux/linkage.h>
|
| 21 | #include <linux/stringify.h>
|
| 22 | #include <linux/errno.h>
|
| 23 | #include <linux/syscalls.h>
|
| 24 | #include <linux/file.h>
|
| 25 | #include <linux/fs.h>
|
| 26 | #include <linux/mman.h>
|
| 27 | #include <linux/sched/mm.h>
|
| 28 | #include <linux/shm.h>
|
| 29 |
|
| 30 | syscall_t sys_call_table[] = {
|
| 31 | #define __SYSCALL(nr, entry) (syscall_t)entry,
|
| 32 | #include <asm/syscall_table.h>
|
| 33 | };
|
| 34 |
|
| 35 | #define COLOUR_ALIGN(addr, pgoff) \
|
| 36 | ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \
|
| 37 | (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
|
| 38 |
|
| 39 | asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
|
| 40 | {
|
| 41 | unsigned long ret;
|
| 42 | long err;
|
| 43 |
|
| 44 | err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
|
| 45 | if (err)
|
| 46 | return err;
|
| 47 | return (long)ret;
|
| 48 | }
|
| 49 |
|
| 50 | asmlinkage long xtensa_fadvise64_64(int fd, int advice,
|
| 51 | unsigned long long offset, unsigned long long len)
|
| 52 | {
|
| 53 | return ksys_fadvise64_64(fd, offset, len, advice);
|
| 54 | }
|
| 55 |
|
| 56 | #ifdef CONFIG_MMU
|
| 57 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
|
| 58 | unsigned long len, unsigned long pgoff, unsigned long flags,
|
| 59 | vm_flags_t vm_flags)
|
| 60 | {
|
| 61 | struct vm_area_struct *vmm;
|
| 62 | struct vma_iterator vmi;
|
| 63 |
|
| 64 | if (flags & MAP_FIXED) {
|
| 65 | |
| 66 | * cache aliasing constraints.
|
| 67 |
|
| 68 | if ((flags & MAP_SHARED) &&
|
| 69 | ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
|
| 70 | return -EINVAL;
|
| 71 | return addr;
|
| 72 | }
|
| 73 |
|
| 74 | if (len > TASK_SIZE)
|
| 75 | return -ENOMEM;
|
| 76 | if (!addr)
|
| 77 | addr = TASK_UNMAPPED_BASE;
|
| 78 |
|
| 79 | if (flags & MAP_SHARED)
|
| 80 | addr = COLOUR_ALIGN(addr, pgoff);
|
| 81 | else
|
| 82 | addr = PAGE_ALIGN(addr);
|
| 83 |
|
| 84 | vma_iter_init(&vmi, current->mm, addr);
|
| 85 | for_each_vma(vmi, vmm) {
|
| 86 |
|
| 87 | if (addr + len <= vm_start_gap(vmm))
|
| 88 | break;
|
| 89 |
|
| 90 | addr = vmm->vm_end;
|
| 91 | if (flags & MAP_SHARED)
|
| 92 | addr = COLOUR_ALIGN(addr, pgoff);
|
| 93 | }
|
| 94 |
|
| 95 | if (TASK_SIZE - len < addr)
|
| 96 | return -ENOMEM;
|
| 97 |
|
| 98 | return addr;
|
| 99 | }
|
| 100 | #endif
|