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git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - arch/mips/kernel/syscall.c
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/branch.h>
33 #include <asm/cachectl.h>
34 #include <asm/cacheflush.h>
35 #include <asm/asm-offsets.h>
36 #include <asm/signal.h>
38 #include <asm/shmparam.h>
39 #include <asm/sysmips.h>
40 #include <asm/switch_to.h>
43 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
44 * convention. It returns results in registers $v0 / $v1 which means there
45 * is no need for it to do verify the validity of a userspace pointer
46 * argument. Historically that used to be expensive in Linux. These days
47 * the performance advantage is negligible.
49 asmlinkage
int sysm_pipe(void)
52 int error
= do_pipe_flags(fd
, 0);
55 current_pt_regs()->regs
[3] = fd
[1];
59 SYSCALL_DEFINE6(mips_mmap
, unsigned long, addr
, unsigned long, len
,
60 unsigned long, prot
, unsigned long, flags
, unsigned long,
63 if (offset
& ~PAGE_MASK
)
65 return sys_mmap_pgoff(addr
, len
, prot
, flags
, fd
, offset
>> PAGE_SHIFT
);
68 SYSCALL_DEFINE6(mips_mmap2
, unsigned long, addr
, unsigned long, len
,
69 unsigned long, prot
, unsigned long, flags
, unsigned long, fd
,
72 if (pgoff
& (~PAGE_MASK
>> 12))
75 return sys_mmap_pgoff(addr
, len
, prot
, flags
, fd
, pgoff
>> (PAGE_SHIFT
-12));
78 save_static_function(sys_fork
);
79 save_static_function(sys_clone
);
81 SYSCALL_DEFINE1(set_thread_area
, unsigned long, addr
)
83 struct thread_info
*ti
= task_thread_info(current
);
86 if (cpu_has_userlocal
)
87 write_c0_userlocal(addr
);
92 static inline int mips_atomic_set(unsigned long addr
, unsigned long new)
94 unsigned long old
, tmp
;
98 if (unlikely(addr
& 3))
101 if (unlikely(!access_ok(VERIFY_WRITE
, addr
, 4)))
104 if (cpu_has_llsc
&& R10000_LLSC_WAR
) {
105 __asm__
__volatile__ (
106 " .set arch=r4000 \n"
108 "1: ll %[old], (%[addr]) \n"
109 " move %[tmp], %[new] \n"
110 "2: sc %[tmp], (%[addr]) \n"
111 " beqzl %[tmp], 1b \n"
114 " .section .fixup,\"ax\" \n"
115 "4: li %[err], %[efault] \n"
118 " .section __ex_table,\"a\" \n"
119 " "STR(PTR
)" 1b, 4b \n"
120 " "STR(PTR
)" 2b, 4b \n"
128 [efault
] "i" (-EFAULT
)
130 } else if (cpu_has_llsc
) {
131 __asm__
__volatile__ (
132 " .set "MIPS_ISA_ARCH_LEVEL
" \n"
134 "1: ll %[old], (%[addr]) \n"
135 " move %[tmp], %[new] \n"
136 "2: sc %[tmp], (%[addr]) \n"
137 " bnez %[tmp], 4f \n"
144 " .section .fixup,\"ax\" \n"
145 "5: li %[err], %[efault] \n"
148 " .section __ex_table,\"a\" \n"
149 " "STR(PTR
)" 1b, 5b \n"
150 " "STR(PTR
)" 2b, 5b \n"
158 [efault
] "i" (-EFAULT
)
167 err
= __get_user(old
, (unsigned int *) addr
);
168 err
|= __put_user(new, (unsigned int *) addr
);
178 regs
= current_pt_regs();
180 regs
->regs
[7] = 0; /* No error */
183 * Don't let your children do this ...
185 __asm__
__volatile__(
191 /* unreached. Honestly. */
195 SYSCALL_DEFINE3(sysmips
, long, cmd
, long, arg1
, long, arg2
)
198 case MIPS_ATOMIC_SET
:
199 return mips_atomic_set(arg1
, arg2
);
206 set_thread_flag(TIF_FIXADE
);
208 clear_thread_flag(TIF_FIXADE
);
210 set_thread_flag(TIF_LOGADE
);
212 clear_thread_flag(TIF_LOGADE
);
225 * No implemented yet ...
227 SYSCALL_DEFINE3(cachectl
, char *, addr
, int, nbytes
, int, op
)
233 * If we ever come here the user sp is bad. Zap the process right away.
234 * Due to the bad stack signaling wouldn't work.
236 asmlinkage
void bad_stack(void)