/* * 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) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2001 MIPS Technologies, Inc. */#include <linux/capability.h>#include <linux/errno.h>#include <linux/linkage.h>#include <linux/mm.h>#include <linux/fs.h>#include <linux/smp.h>#include <linux/mman.h>#include <linux/ptrace.h>#include <linux/sched.h>#include <linux/string.h>#include <linux/syscalls.h>#include <linux/file.h>#include <linux/utsname.h>#include <linux/unistd.h>#include <linux/sem.h>#include <linux/msg.h>#include <linux/shm.h>#include <linux/compiler.h>#include <linux/module.h>#include <linux/ipc.h>#include <linux/uaccess.h>#include <linux/slab.h>#include <linux/random.h>#include <linux/elf.h> #include <asm/asm.h>#include <asm/branch.h>#include <asm/cachectl.h>#include <asm/cacheflush.h>#include <asm/asm-offsets.h>#include <asm/signal.h>#include <asm/sim.h>#include <asm/shmparam.h>#include <asm/sysmips.h>#include <asm/uaccess.h> /* * For historic reasons the pipe(2) syscall on MIPS has an unusual calling * convention.  It returns results in registers $v0 / $v1 which means there * is no need for it to do verify the validity of a userspace pointer * argument.  Historically that used to be expensive in Linux.  These days * the performance advantage is negligible. */asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs){	int fd[2];	int error, res; 	error = do_pipe_flags(fd, 0);	if (error) {		res = error;		goto out;	}	regs.regs[3] = fd[1];	res = fd[0];out:	return res;} unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */ EXPORT_SYMBOL(shm_align_mask); #define COLOUR_ALIGN(addr,pgoff)				\	((((addr) + shm_align_mask) & ~shm_align_mask) +	\	 (((pgoff) << PAGE_SHIFT) & shm_align_mask)) 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;	int do_color_align;	unsigned long task_size; #ifdef CONFIG_32BIT	task_size = TASK_SIZE;#else /* Must be CONFIG_64BIT*/	task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE;#endif 	if (len > task_size)		return -ENOMEM; 	if (flags & MAP_FIXED) {		/* Even MAP_FIXED mappings must reside within task_size.  */		if (task_size - len < addr)			return -EINVAL; 		/*		 * We do not accept a shared mapping if it would violate		 * cache aliasing constraints.		 */		if ((flags & MAP_SHARED) &&		    ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))			return -EINVAL;		return addr;	} 	do_color_align = 0;	if (filp || (flags & MAP_SHARED))		do_color_align = 1;	if (addr) {		if (do_color_align)			addr = COLOUR_ALIGN(addr, pgoff);		else			addr = PAGE_ALIGN(addr);		vmm = find_vma(current->mm, addr);		if (task_size - len >= addr &&		    (!vmm || addr + len <= vmm->vm_start))			return addr;	}	addr = current->mm->mmap_base;	if (do_color_align)		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 <= vmm->vm_start)			return addr;		addr = vmm->vm_end;		if (do_color_align)			addr = COLOUR_ALIGN(addr, pgoff);	}} void arch_pick_mmap_layout(struct mm_struct *mm){	unsigned long random_factor = 0UL; 	if (current->flags & PF_RANDOMIZE) {		random_factor = get_random_int();		random_factor = random_factor << PAGE_SHIFT;		if (TASK_IS_32BIT_ADDR)			random_factor &= 0xfffffful;		else			random_factor &= 0xffffffful;	} 	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;	mm->get_unmapped_area = arch_get_unmapped_area;	mm->unmap_area = arch_unmap_area;} static inline unsigned long brk_rnd(void){	unsigned long rnd = get_random_int(); 	rnd = rnd << PAGE_SHIFT;	/* 8MB for 32bit, 256MB for 64bit */	if (TASK_IS_32BIT_ADDR)		rnd = rnd & 0x7ffffful;	else		rnd = rnd & 0xffffffful; 	return rnd;} unsigned long arch_randomize_brk(struct mm_struct *mm){	unsigned long base = mm->brk;	unsigned long ret; 	ret = PAGE_ALIGN(base + brk_rnd()); 	if (ret < mm->brk)		return mm->brk; 	return ret;} SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,	unsigned long, prot, unsigned long, flags, unsigned long,	fd, off_t, offset){	unsigned long result; 	result = -EINVAL;	if (offset & ~PAGE_MASK)		goto out; 	result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); out:	return result;} SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,	unsigned long, prot, unsigned long, flags, unsigned long, fd,	unsigned long, pgoff){	if (pgoff & (~PAGE_MASK >> 12))		return -EINVAL; 	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));} save_static_function(sys_fork);static int __used noinline_sys_fork(nabi_no_regargs struct pt_regs regs){	return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);} save_static_function(sys_clone);static int __used noinline_sys_clone(nabi_no_regargs struct pt_regs regs){	unsigned long clone_flags;	unsigned long newsp;	int __user *parent_tidptr, *child_tidptr; 	clone_flags = regs.regs[4];	newsp = regs.regs[5];	if (!newsp)		newsp = regs.regs[29];	parent_tidptr = (int __user *) regs.regs[6];#ifdef CONFIG_32BIT	/* We need to fetch the fifth argument off the stack.  */	child_tidptr = NULL;	if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) {		int __user *__user *usp = (int __user *__user *) regs.regs[29];		if (regs.regs[2] == __NR_syscall) {			if (get_user (child_tidptr, &usp[5]))				return -EFAULT;		}		else if (get_user (child_tidptr, &usp[4]))			return -EFAULT;	}#else	child_tidptr = (int __user *) regs.regs[8];#endif	return do_fork(clone_flags, newsp, &regs, 0,	               parent_tidptr, child_tidptr);} /* * sys_execve() executes a new program. */asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs){	int error;	char * filename; 	filename = getname((const char __user *) (long)regs.regs[4]);	error = PTR_ERR(filename);	if (IS_ERR(filename))		goto out;	error = do_execve(filename,			  (const char __user *const __user *) (long)regs.regs[5],	                  (const char __user *const __user *) (long)regs.regs[6],			  &regs);	putname(filename); out:	return error;} SYSCALL_DEFINE1(set_thread_area, unsigned long, addr){	struct thread_info *ti = task_thread_info(current); 	ti->tp_value = addr;	if (cpu_has_userlocal)		write_c0_userlocal(addr); 	return 0;} static inline int mips_atomic_set(struct pt_regs *regs,	unsigned long addr, unsigned long new){	unsigned long old, tmp;	unsigned int err; 	if (unlikely(addr & 3))		return -EINVAL; 	if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))		return -EINVAL; 	if (cpu_has_llsc && R10000_LLSC_WAR) {		__asm__ __volatile__ (		"	.set	mips3					\n"		"	li	%[err], 0				\n"		"1:	ll	%[old], (%[addr])			\n"		"	move	%[tmp], %[new]				\n"		"2:	sc	%[tmp], (%[addr])			\n"		"	beqzl	%[tmp], 1b				\n"		"3:							\n"		"	.section .fixup,\"ax\"				\n"		"4:	li	%[err], %[efault]			\n"		"	j	3b					\n"		"	.previous					\n"		"	.section __ex_table,\"a\"			\n"		"	"STR(PTR)"	1b, 4b				\n"		"	"STR(PTR)"	2b, 4b				\n"		"	.previous					\n"		"	.set	mips0					\n"		: [old] "=&r" (old),		  [err] "=&r" (err),		  [tmp] "=&r" (tmp)		: [addr] "r" (addr),		  [new] "r" (new),		  [efault] "i" (-EFAULT)		: "memory");	} else if (cpu_has_llsc) {		__asm__ __volatile__ (		"	.set	mips3					\n"		"	li	%[err], 0				\n"		"1:	ll	%[old], (%[addr])			\n"		"	move	%[tmp], %[new]				\n"		"2:	sc	%[tmp], (%[addr])			\n"		"	bnez	%[tmp], 4f				\n"		"3:							\n"		"	.subsection 2					\n"		"4:	b	1b					\n"		"	.previous					\n"		"							\n"		"	.section .fixup,\"ax\"				\n"		"5:	li	%[err], %[efault]			\n"		"	j	3b					\n"		"	.previous					\n"		"	.section __ex_table,\"a\"			\n"		"	"STR(PTR)"	1b, 5b				\n"		"	"STR(PTR)"	2b, 5b				\n"		"	.previous					\n"		"	.set	mips0					\n"		: [old] "=&r" (old),		  [err] "=&r" (err),		  [tmp] "=&r" (tmp)		: [addr] "r" (addr),		  [new] "r" (new),		  [efault] "i" (-EFAULT)		: "memory");	} else {		do {			preempt_disable();			ll_bit = 1;			ll_task = current;			preempt_enable(); 			err = __get_user(old, (unsigned int *) addr);			err |= __put_user(new, (unsigned int *) addr);			if (err)				break;			rmb();		} while (!ll_bit);	} 	if (unlikely(err))		return err; 	regs->regs[2] = old;	regs->regs[7] = 0;	/* No error */ 	/*	 * Don't let your children do this ...	 */	__asm__ __volatile__(	"	move	$29, %0						\n"	"	j	syscall_exit					\n"	: /* no outputs */	: "r" (regs)); 	/* unreached.  Honestly.  */	while (1);} save_static_function(sys_sysmips);static int __used noinline_sys_sysmips(nabi_no_regargs struct pt_regs regs){	long cmd, arg1, arg2; 	cmd = regs.regs[4];	arg1 = regs.regs[5];	arg2 = regs.regs[6]; 	switch (cmd) {	case MIPS_ATOMIC_SET:		return mips_atomic_set(&regs, arg1, arg2); 	case MIPS_FIXADE:		if (arg1 & ~3)			return -EINVAL; 		if (arg1 & 1)			set_thread_flag(TIF_FIXADE);		else			clear_thread_flag(TIF_FIXADE);		if (arg1 & 2)			set_thread_flag(TIF_LOGADE);		else			clear_thread_flag(TIF_LOGADE); 		return 0; 	case FLUSH_CACHE:		__flush_cache_all();		return 0;	} 	return -EINVAL;} /* * No implemented yet ... */SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op){	return -ENOSYS;} /* * If we ever come here the user sp is bad.  Zap the process right away. * Due to the bad stack signaling wouldn't work. */asmlinkage void bad_stack(void){	do_exit(SIGSEGV);} /* * Do a system call from kernel instead of calling sys_execve so we * end up with proper pt_regs. */int kernel_execve(const char *filename,		  const char *const argv[],		  const char *const envp[]){	register unsigned long __a0 asm("$4") = (unsigned long) filename;	register unsigned long __a1 asm("$5") = (unsigned long) argv;	register unsigned long __a2 asm("$6") = (unsigned long) envp;	register unsigned long __a3 asm("$7");	unsigned long __v0; 	__asm__ volatile ("					\n"	"	.set	noreorder				\n"	"	li	$2, %5		# __NR_execve		\n"	"	syscall						\n"	"	move	%0, $2					\n"	"	.set	reorder					\n"	: "=&r" (__v0), "=r" (__a3)	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)	: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",	  "memory"); 	if (__a3 == 0)		return __v0; 	return -__v0;}