/* * 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 <asm/unistd.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> typedef void (*syscall_t)(void); syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {	[0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall, #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol,#include <uapi/asm/unistd.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 sys_fadvise64_64(fd, offset, len, advice);} #ifdef CONFIG_MMUunsigned 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