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 syscall_t sys_call_table[__NR_syscalls] /* FIXME __cacheline_aligned */= { 32 [0 ... __NR_syscalls - 1] = (syscall_t)&sys_ni_syscall, 33 34 #define __SYSCALL(nr, entry, nargs)[nr] = (syscall_t)entry, 35 #include <asm/syscall_table.h> 36 #undef __SYSCALL 37 }; 38 39 #define COLOUR_ALIGN(addr, pgoff) \ 40 ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \ 41 (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1))) 42 43 asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg) 44 { 45 unsigned long ret; 46 long err; 47 48 err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA); 49 if (err) 50 return err; 51 return (long)ret; 52 } 53 54 asmlinkage long xtensa_fadvise64_64(int fd, int advice, 55 unsigned long long offset, unsigned long long len) 56 { 57 return ksys_fadvise64_64(fd, offset, len, advice); 58 } 59 60 #ifdef CONFIG_MMU 61 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 62 unsigned long len, unsigned long pgoff, unsigned long flags) 63 { 64 struct vm_area_struct *vmm; 65 66 if (flags & MAP_FIXED) { 67 /* We do not accept a shared mapping if it would violate 68 * cache aliasing constraints. 69 */ 70 if ((flags & MAP_SHARED) && 71 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 72 return -EINVAL; 73 return addr; 74 } 75 76 if (len > TASK_SIZE) 77 return -ENOMEM; 78 if (!addr) 79 addr = TASK_UNMAPPED_BASE; 80 81 if (flags & MAP_SHARED) 82 addr = COLOUR_ALIGN(addr, pgoff); 83 else 84 addr = PAGE_ALIGN(addr); 85 86 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 87 /* At this point: (!vmm || addr < vmm->vm_end). */ 88 if (TASK_SIZE - len < addr) 89 return -ENOMEM; 90 if (!vmm || addr + len <= vm_start_gap(vmm)) 91 return addr; 92 addr = vmm->vm_end; 93 if (flags & MAP_SHARED) 94 addr = COLOUR_ALIGN(addr, pgoff); 95 } 96 } 97 #endif 98