/* * 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/fs.h>#include <linux/smp.h>#include <linux/ptrace.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/ipc.h>#include <linux/uaccess.h>#include <linux/slab.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>#include <asm/switch_to.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(void){	int fd[2];	int error = do_pipe_flags(fd, 0);	if (error)		return error;	current_pt_regs()->regs[3] = fd[1];	return fd[0];} 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);save_static_function(sys_clone); 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(unsigned long addr, unsigned long new){	unsigned long old, tmp;	struct pt_regs *regs;	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	arch=r4000				\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"		"	.insn						\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	"MIPS_ISA_ARCH_LEVEL"			\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"		"	.insn						\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 = current_pt_regs();	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.  */	unreachable();} SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2){	switch (cmd) {	case MIPS_ATOMIC_SET:		return mips_atomic_set(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);}