/* * arch/xtensa/kernel/syscall.c * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 - 2005 Tensilica Inc. * Copyright (C) 2000 Silicon Graphics, Inc. * Copyright (C) 1995 - 2000 by Ralf Baechle * * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca> * Chris Zankel <chris@zankel.net> * Kevin Chea * */ #include <linux/uaccess.h> #include <asm/syscall.h> #include <linux/linkage.h> #include <linux/stringify.h> #include <linux/errno.h> #include <linux/syscalls.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/mman.h> #include <linux/sched/mm.h> #include <linux/shm.h> syscall_t sys_call_table[] /* FIXME __cacheline_aligned */= { #define __SYSCALL(nr, entry) (syscall_t)entry, #include <asm/syscall_table.h> }; #define COLOUR_ALIGN(addr, pgoff) \ ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \ (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1))) asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg) { unsigned long ret; long err; err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA); if (err) return err; return (long)ret; } asmlinkage long xtensa_fadvise64_64(int fd, int advice, unsigned long long offset, unsigned long long len) { return ksys_fadvise64_64(fd, offset, len, advice); } #ifdef CONFIG_MMU unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct vm_area_struct *vmm; if (flags & MAP_FIXED) { /* We do not accept a shared mapping if it would violate * cache aliasing constraints. */ if ((flags & MAP_SHARED) && ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) return -EINVAL; return addr; } if (len > TASK_SIZE) return -ENOMEM; if (!addr) addr = TASK_UNMAPPED_BASE; if (flags & MAP_SHARED) addr = COLOUR_ALIGN(addr, pgoff); else addr = PAGE_ALIGN(addr); for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { /* At this point: (!vmm || addr < vmm->vm_end). */ if (TASK_SIZE - len < addr) return -ENOMEM; if (!vmm || addr + len <= vm_start_gap(vmm)) return addr; addr = vmm->vm_end; if (flags & MAP_SHARED) addr = COLOUR_ALIGN(addr, pgoff); } } #endif