2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Copyright (C) 2001 MIPS Technologies, Inc.
10 #include <linux/capability.h>
11 #include <linux/errno.h>
12 #include <linux/linkage.h>
14 #include <linux/smp.h>
15 #include <linux/ptrace.h>
16 #include <linux/string.h>
17 #include <linux/syscalls.h>
18 #include <linux/file.h>
19 #include <linux/utsname.h>
20 #include <linux/unistd.h>
21 #include <linux/sem.h>
22 #include <linux/msg.h>
23 #include <linux/shm.h>
24 #include <linux/compiler.h>
25 #include <linux/ipc.h>
26 #include <linux/uaccess.h>
27 #include <linux/slab.h>
28 #include <linux/elf.h>
29 #include <linux/sched/task_stack.h>
32 #include <asm/asm-eva.h>
33 #include <asm/branch.h>
34 #include <asm/cachectl.h>
35 #include <asm/cacheflush.h>
36 #include <asm/asm-offsets.h>
37 #include <asm/signal.h>
39 #include <asm/shmparam.h>
40 #include <asm/sysmips.h>
41 #include <asm/switch_to.h>
44 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
45 * convention. It returns results in registers $v0 / $v1 which means there
46 * is no need for it to do verify the validity of a userspace pointer
47 * argument. Historically that used to be expensive in Linux. These days
48 * the performance advantage is negligible.
50 asmlinkage
int sysm_pipe(void)
53 int error
= do_pipe_flags(fd
, 0);
56 current_pt_regs()->regs
[3] = fd
[1];
60 SYSCALL_DEFINE6(mips_mmap
, unsigned long, addr
, unsigned long, len
,
61 unsigned long, prot
, unsigned long, flags
, unsigned long,
64 if (offset
& ~PAGE_MASK
)
66 return sys_mmap_pgoff(addr
, len
, prot
, flags
, fd
, offset
>> PAGE_SHIFT
);
69 SYSCALL_DEFINE6(mips_mmap2
, unsigned long, addr
, unsigned long, len
,
70 unsigned long, prot
, unsigned long, flags
, unsigned long, fd
,
73 if (pgoff
& (~PAGE_MASK
>> 12))
76 return sys_mmap_pgoff(addr
, len
, prot
, flags
, fd
, pgoff
>> (PAGE_SHIFT
-12));
79 save_static_function(sys_fork
);
80 save_static_function(sys_clone
);
82 SYSCALL_DEFINE1(set_thread_area
, unsigned long, addr
)
84 struct thread_info
*ti
= task_thread_info(current
);
87 if (cpu_has_userlocal
)
88 write_c0_userlocal(addr
);
93 static inline int mips_atomic_set(unsigned long addr
, unsigned long new)
95 unsigned long old
, tmp
;
99 if (unlikely(addr
& 3))
102 if (unlikely(!access_ok(VERIFY_WRITE
, (const void __user
*)addr
, 4)))
105 if (cpu_has_llsc
&& R10000_LLSC_WAR
) {
106 __asm__
__volatile__ (
107 " .set arch=r4000 \n"
109 "1: ll %[old], (%[addr]) \n"
110 " move %[tmp], %[new] \n"
111 "2: sc %[tmp], (%[addr]) \n"
112 " beqzl %[tmp], 1b \n"
115 " .section .fixup,\"ax\" \n"
116 "4: li %[err], %[efault] \n"
119 " .section __ex_table,\"a\" \n"
120 " "STR(PTR
)" 1b, 4b \n"
121 " "STR(PTR
)" 2b, 4b \n"
129 [efault
] "i" (-EFAULT
)
131 } else if (cpu_has_llsc
) {
132 __asm__
__volatile__ (
133 " .set "MIPS_ISA_ARCH_LEVEL
" \n"
136 user_ll("%[old]", "(%[addr])")
137 " move %[tmp], %[new] \n"
139 user_sc("%[tmp]", "(%[addr])")
140 " beqz %[tmp], 1b \n"
143 " .section .fixup,\"ax\" \n"
144 "5: li %[err], %[efault] \n"
147 " .section __ex_table,\"a\" \n"
148 " "STR(PTR
)" 1b, 5b \n"
149 " "STR(PTR
)" 2b, 5b \n"
157 [efault
] "i" (-EFAULT
)
166 err
= __get_user(old
, (unsigned int *) addr
);
167 err
|= __put_user(new, (unsigned int *) addr
);
177 regs
= current_pt_regs();
179 regs
->regs
[7] = 0; /* No error */
182 * Don't let your children do this ...
184 __asm__
__volatile__(
190 /* unreached. Honestly. */
195 * mips_atomic_set() normally returns directly via syscall_exit potentially
196 * clobbering static registers, so be sure to preserve them.
198 save_static_function(sys_sysmips
);
200 SYSCALL_DEFINE3(sysmips
, long, cmd
, long, arg1
, long, arg2
)
203 case MIPS_ATOMIC_SET
:
204 return mips_atomic_set(arg1
, arg2
);
211 set_thread_flag(TIF_FIXADE
);
213 clear_thread_flag(TIF_FIXADE
);
215 set_thread_flag(TIF_LOGADE
);
217 clear_thread_flag(TIF_LOGADE
);
230 * No implemented yet ...
232 SYSCALL_DEFINE3(cachectl
, char *, addr
, int, nbytes
, int, op
)
238 * If we ever come here the user sp is bad. Zap the process right away.
239 * Due to the bad stack signaling wouldn't work.
241 asmlinkage
void bad_stack(void)