Chris Zankel | fc4fb2a | 2006-12-10 02:18:52 -0800 | [diff] [blame] | 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 | */ |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 18 | #include <linux/uaccess.h> |
Chris Zankel | 1c0350b | 2006-12-13 00:34:32 -0800 | [diff] [blame] | 19 | #include <asm/syscall.h> |
Chris Zankel | fc4fb2a | 2006-12-10 02:18:52 -0800 | [diff] [blame] | 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> |
Ingo Molnar | 0104260 | 2017-02-08 18:51:31 +0100 | [diff] [blame] | 28 | #include <linux/sched/mm.h> |
Chris Zankel | fc4fb2a | 2006-12-10 02:18:52 -0800 | [diff] [blame] | 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 | |
Chris Zankel | fc4fb2a | 2006-12-10 02:18:52 -0800 | [diff] [blame] | 36 | #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol, |
Chris Zankel | 2f72d4f | 2012-10-23 20:17:05 -0700 | [diff] [blame] | 37 | #include <uapi/asm/unistd.h> |
Chris Zankel | fc4fb2a | 2006-12-10 02:18:52 -0800 | [diff] [blame] | 38 | }; |
| 39 | |
Max Filippov | de73b6b | 2012-12-22 06:35:04 +0400 | [diff] [blame] | 40 | #define COLOUR_ALIGN(addr, pgoff) \ |
| 41 | ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \ |
| 42 | (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1))) |
| 43 | |
Chris Zankel | fc4fb2a | 2006-12-10 02:18:52 -0800 | [diff] [blame] | 44 | asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg) |
| 45 | { |
| 46 | unsigned long ret; |
| 47 | long err; |
| 48 | |
Will Deacon | 079a96a | 2012-07-30 14:42:38 -0700 | [diff] [blame] | 49 | err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA); |
Chris Zankel | fc4fb2a | 2006-12-10 02:18:52 -0800 | [diff] [blame] | 50 | if (err) |
| 51 | return err; |
| 52 | return (long)ret; |
| 53 | } |
| 54 | |
Chris Zankel | 2f72d4f | 2012-10-23 20:17:05 -0700 | [diff] [blame] | 55 | asmlinkage long xtensa_fadvise64_64(int fd, int advice, |
| 56 | unsigned long long offset, unsigned long long len) |
Chris Zankel | bc671aa | 2007-08-05 10:22:58 -0700 | [diff] [blame] | 57 | { |
| 58 | return sys_fadvise64_64(fd, offset, len, advice); |
| 59 | } |
Max Filippov | de73b6b | 2012-12-22 06:35:04 +0400 | [diff] [blame] | 60 | |
Max Filippov | d10fa7c | 2014-09-22 07:21:48 +0400 | [diff] [blame] | 61 | #ifdef CONFIG_MMU |
Max Filippov | de73b6b | 2012-12-22 06:35:04 +0400 | [diff] [blame] | 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; |
Hugh Dickins | 1be7107 | 2017-06-19 04:03:24 -0700 | [diff] [blame] | 91 | if (!vmm || addr + len <= vm_start_gap(vmm)) |
Max Filippov | de73b6b | 2012-12-22 06:35:04 +0400 | [diff] [blame] | 92 | return addr; |
| 93 | addr = vmm->vm_end; |
| 94 | if (flags & MAP_SHARED) |
| 95 | addr = COLOUR_ALIGN(addr, pgoff); |
| 96 | } |
| 97 | } |
Max Filippov | d10fa7c | 2014-09-22 07:21:48 +0400 | [diff] [blame] | 98 | #endif |