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 <asm/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/shm.h> 29 30 typedef void (*syscall_t)(void); 31 32 syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= { 33 [0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall, 34 35 #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol, 36 #include <uapi/asm/unistd.h> 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 sys_fadvise64_64(fd, offset, len, advice); 58 } 59 60 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 61 unsigned long len, unsigned long pgoff, unsigned long flags) 62 { 63 struct vm_area_struct *vmm; 64 65 if (flags & MAP_FIXED) { 66 /* We do not accept a shared mapping if it would violate 67 * cache aliasing constraints. 68 */ 69 if ((flags & MAP_SHARED) && 70 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 71 return -EINVAL; 72 return addr; 73 } 74 75 if (len > TASK_SIZE) 76 return -ENOMEM; 77 if (!addr) 78 addr = TASK_UNMAPPED_BASE; 79 80 if (flags & MAP_SHARED) 81 addr = COLOUR_ALIGN(addr, pgoff); 82 else 83 addr = PAGE_ALIGN(addr); 84 85 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 86 /* At this point: (!vmm || addr < vmm->vm_end). */ 87 if (TASK_SIZE - len < addr) 88 return -ENOMEM; 89 if (!vmm || addr + len <= vmm->vm_start) 90 return addr; 91 addr = vmm->vm_end; 92 if (flags & MAP_SHARED) 93 addr = COLOUR_ALIGN(addr, pgoff); 94 } 95 } 96