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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 <joe@tensilica.com, joetylr@yahoo.com>
13 * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
14 * Chris Zankel <chris@zankel.net>
15 * Kevin Chea
16 *
17 */
18 #include <linux/uaccess.h>
19 #include <asm/syscall.h>
20 #include <asm/unistd.h>
21 #include <linux/linkage.h>
22 #include <linux/stringify.h>
23 #include <linux/errno.h>
24 #include <linux/syscalls.h>
25 #include <linux/file.h>
26 #include <linux/fs.h>
27 #include <linux/mman.h>
28 #include <linux/sched/mm.h>
29 #include <linux/shm.h>
30
31 typedef void (*syscall_t)(void);
32
33 syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {
34 [0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall,
35
36 #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol,
37 #include <uapi/asm/unistd.h>
38 };
39
40 #define COLOUR_ALIGN(addr, pgoff) \
41 ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \
42 (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
43
44 asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
45 {
46 unsigned long ret;
47 long err;
48
49 err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
50 if (err)
51 return err;
52 return (long)ret;
53 }
54
55 asmlinkage long xtensa_fadvise64_64(int fd, int advice,
56 unsigned long long offset, unsigned long long len)
57 {
58 return sys_fadvise64_64(fd, offset, len, advice);
59 }
60
61 #ifdef CONFIG_MMU
62 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
63 unsigned long len, unsigned long pgoff, unsigned long flags)
64 {
65 struct vm_area_struct *vmm;
66
67 if (flags & MAP_FIXED) {
68 /* We do not accept a shared mapping if it would violate
69 * cache aliasing constraints.
70 */
71 if ((flags & MAP_SHARED) &&
72 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
73 return -EINVAL;
74 return addr;
75 }
76
77 if (len > TASK_SIZE)
78 return -ENOMEM;
79 if (!addr)
80 addr = TASK_UNMAPPED_BASE;
81
82 if (flags & MAP_SHARED)
83 addr = COLOUR_ALIGN(addr, pgoff);
84 else
85 addr = PAGE_ALIGN(addr);
86
87 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
88 /* At this point: (!vmm || addr < vmm->vm_end). */
89 if (TASK_SIZE - len < addr)
90 return -ENOMEM;
91 if (!vmm || addr + len <= vm_start_gap(vmm))
92 return addr;
93 addr = vmm->vm_end;
94 if (flags & MAP_SHARED)
95 addr = COLOUR_ALIGN(addr, pgoff);
96 }
97 }
98 #endif