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1da177e4 LT |
1 | /* |
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 | |
4 | * for more details. | |
5 | * | |
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. | |
9 | */ | |
a9415644 | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/errno.h> |
12 | #include <linux/linkage.h> | |
4e950f6f | 13 | #include <linux/fs.h> |
1da177e4 | 14 | #include <linux/smp.h> |
1da177e4 | 15 | #include <linux/ptrace.h> |
1da177e4 LT |
16 | #include <linux/string.h> |
17 | #include <linux/syscalls.h> | |
18 | #include <linux/file.h> | |
1da177e4 LT |
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> | |
cba4fbbf | 25 | #include <linux/ipc.h> |
f1e39a4a | 26 | #include <linux/uaccess.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
652b14aa | 28 | #include <linux/elf.h> |
68db0cf1 | 29 | #include <linux/sched/task_stack.h> |
1da177e4 | 30 | |
f1e39a4a | 31 | #include <asm/asm.h> |
4915e1b0 | 32 | #include <asm/asm-eva.h> |
1da177e4 LT |
33 | #include <asm/branch.h> |
34 | #include <asm/cachectl.h> | |
35 | #include <asm/cacheflush.h> | |
048eb582 | 36 | #include <asm/asm-offsets.h> |
1da177e4 LT |
37 | #include <asm/signal.h> |
38 | #include <asm/sim.h> | |
39 | #include <asm/shmparam.h> | |
40 | #include <asm/sysmips.h> | |
b81947c6 | 41 | #include <asm/switch_to.h> |
1da177e4 | 42 | |
8213bbf9 RB |
43 | /* |
44 | * For historic reasons the pipe(2) syscall on MIPS has an unusual calling | |
70342287 | 45 | * convention. It returns results in registers $v0 / $v1 which means there |
8213bbf9 | 46 | * is no need for it to do verify the validity of a userspace pointer |
70342287 | 47 | * argument. Historically that used to be expensive in Linux. These days |
8213bbf9 RB |
48 | * the performance advantage is negligible. |
49 | */ | |
974fdb3c | 50 | asmlinkage int sysm_pipe(void) |
1da177e4 LT |
51 | { |
52 | int fd[2]; | |
974fdb3c AV |
53 | int error = do_pipe_flags(fd, 0); |
54 | if (error) | |
55 | return error; | |
56 | current_pt_regs()->regs[3] = fd[1]; | |
57 | return fd[0]; | |
1da177e4 LT |
58 | } |
59 | ||
dbda6ac0 RB |
60 | SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, |
61 | unsigned long, prot, unsigned long, flags, unsigned long, | |
62 | fd, off_t, offset) | |
1da177e4 | 63 | { |
1da177e4 | 64 | if (offset & ~PAGE_MASK) |
c9d3fdf3 | 65 | return -EINVAL; |
a90f590a DB |
66 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, |
67 | offset >> PAGE_SHIFT); | |
1da177e4 LT |
68 | } |
69 | ||
dbda6ac0 RB |
70 | SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, |
71 | unsigned long, prot, unsigned long, flags, unsigned long, fd, | |
72 | unsigned long, pgoff) | |
1da177e4 | 73 | { |
947df17c PA |
74 | if (pgoff & (~PAGE_MASK >> 12)) |
75 | return -EINVAL; | |
76 | ||
a90f590a DB |
77 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, |
78 | pgoff >> (PAGE_SHIFT - 12)); | |
1da177e4 LT |
79 | } |
80 | ||
81 | save_static_function(sys_fork); | |
1da177e4 | 82 | save_static_function(sys_clone); |
1da177e4 | 83 | |
dbda6ac0 | 84 | SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) |
3c37026d | 85 | { |
dc8f6029 | 86 | struct thread_info *ti = task_thread_info(current); |
3c37026d RB |
87 | |
88 | ti->tp_value = addr; | |
a3692020 RB |
89 | if (cpu_has_userlocal) |
90 | write_c0_userlocal(addr); | |
06be375b RB |
91 | |
92 | return 0; | |
3c37026d RB |
93 | } |
94 | ||
12890d0f | 95 | static inline int mips_atomic_set(unsigned long addr, unsigned long new) |
1da177e4 | 96 | { |
f1e39a4a | 97 | unsigned long old, tmp; |
12890d0f | 98 | struct pt_regs *regs; |
f1e39a4a RB |
99 | unsigned int err; |
100 | ||
101 | if (unlikely(addr & 3)) | |
102 | return -EINVAL; | |
103 | ||
96d4f267 | 104 | if (unlikely(!access_ok((const void __user *)addr, 4))) |
f1e39a4a RB |
105 | return -EINVAL; |
106 | ||
107 | if (cpu_has_llsc && R10000_LLSC_WAR) { | |
108 | __asm__ __volatile__ ( | |
378ed6f0 | 109 | " .set push \n" |
a809d460 | 110 | " .set arch=r4000 \n" |
f1e39a4a RB |
111 | " li %[err], 0 \n" |
112 | "1: ll %[old], (%[addr]) \n" | |
113 | " move %[tmp], %[new] \n" | |
114 | "2: sc %[tmp], (%[addr]) \n" | |
115 | " beqzl %[tmp], 1b \n" | |
116 | "3: \n" | |
0e525e48 | 117 | " .insn \n" |
f1e39a4a RB |
118 | " .section .fixup,\"ax\" \n" |
119 | "4: li %[err], %[efault] \n" | |
120 | " j 3b \n" | |
121 | " .previous \n" | |
122 | " .section __ex_table,\"a\" \n" | |
123 | " "STR(PTR)" 1b, 4b \n" | |
124 | " "STR(PTR)" 2b, 4b \n" | |
125 | " .previous \n" | |
378ed6f0 | 126 | " .set pop \n" |
f1e39a4a RB |
127 | : [old] "=&r" (old), |
128 | [err] "=&r" (err), | |
129 | [tmp] "=&r" (tmp) | |
130 | : [addr] "r" (addr), | |
131 | [new] "r" (new), | |
132 | [efault] "i" (-EFAULT) | |
133 | : "memory"); | |
134 | } else if (cpu_has_llsc) { | |
135 | __asm__ __volatile__ ( | |
378ed6f0 | 136 | " .set push \n" |
fee313d4 | 137 | " .set "MIPS_ISA_ARCH_LEVEL" \n" |
f1e39a4a | 138 | " li %[err], 0 \n" |
4915e1b0 JH |
139 | "1: \n" |
140 | user_ll("%[old]", "(%[addr])") | |
f1e39a4a | 141 | " move %[tmp], %[new] \n" |
4915e1b0 JH |
142 | "2: \n" |
143 | user_sc("%[tmp]", "(%[addr])") | |
203e090a | 144 | " beqz %[tmp], 1b \n" |
f1e39a4a | 145 | "3: \n" |
0e525e48 | 146 | " .insn \n" |
f1e39a4a RB |
147 | " .section .fixup,\"ax\" \n" |
148 | "5: li %[err], %[efault] \n" | |
149 | " j 3b \n" | |
150 | " .previous \n" | |
151 | " .section __ex_table,\"a\" \n" | |
152 | " "STR(PTR)" 1b, 5b \n" | |
153 | " "STR(PTR)" 2b, 5b \n" | |
154 | " .previous \n" | |
378ed6f0 | 155 | " .set pop \n" |
f1e39a4a RB |
156 | : [old] "=&r" (old), |
157 | [err] "=&r" (err), | |
158 | [tmp] "=&r" (tmp) | |
159 | : [addr] "r" (addr), | |
160 | [new] "r" (new), | |
161 | [efault] "i" (-EFAULT) | |
162 | : "memory"); | |
163 | } else { | |
164 | do { | |
165 | preempt_disable(); | |
166 | ll_bit = 1; | |
167 | ll_task = current; | |
168 | preempt_enable(); | |
169 | ||
170 | err = __get_user(old, (unsigned int *) addr); | |
171 | err |= __put_user(new, (unsigned int *) addr); | |
172 | if (err) | |
173 | break; | |
174 | rmb(); | |
175 | } while (!ll_bit); | |
176 | } | |
177 | ||
178 | if (unlikely(err)) | |
179 | return err; | |
180 | ||
12890d0f | 181 | regs = current_pt_regs(); |
f1e39a4a RB |
182 | regs->regs[2] = old; |
183 | regs->regs[7] = 0; /* No error */ | |
184 | ||
185 | /* | |
186 | * Don't let your children do this ... | |
187 | */ | |
188 | __asm__ __volatile__( | |
189 | " move $29, %0 \n" | |
190 | " j syscall_exit \n" | |
191 | : /* no outputs */ | |
192 | : "r" (regs)); | |
193 | ||
194 | /* unreached. Honestly. */ | |
f2ace931 | 195 | unreachable(); |
f1e39a4a RB |
196 | } |
197 | ||
49955d84 JH |
198 | /* |
199 | * mips_atomic_set() normally returns directly via syscall_exit potentially | |
200 | * clobbering static registers, so be sure to preserve them. | |
201 | */ | |
202 | save_static_function(sys_sysmips); | |
203 | ||
12890d0f | 204 | SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) |
f1e39a4a | 205 | { |
293c5bd1 | 206 | switch (cmd) { |
1da177e4 | 207 | case MIPS_ATOMIC_SET: |
12890d0f | 208 | return mips_atomic_set(arg1, arg2); |
1da177e4 LT |
209 | |
210 | case MIPS_FIXADE: | |
293c5bd1 RB |
211 | if (arg1 & ~3) |
212 | return -EINVAL; | |
213 | ||
214 | if (arg1 & 1) | |
215 | set_thread_flag(TIF_FIXADE); | |
216 | else | |
217 | clear_thread_flag(TIF_FIXADE); | |
218 | if (arg1 & 2) | |
219 | set_thread_flag(TIF_LOGADE); | |
220 | else | |
e56293b1 | 221 | clear_thread_flag(TIF_LOGADE); |
293c5bd1 | 222 | |
1da177e4 LT |
223 | return 0; |
224 | ||
225 | case FLUSH_CACHE: | |
226 | __flush_cache_all(); | |
227 | return 0; | |
1da177e4 LT |
228 | } |
229 | ||
230 | return -EINVAL; | |
231 | } | |
232 | ||
1da177e4 LT |
233 | /* |
234 | * No implemented yet ... | |
235 | */ | |
dbda6ac0 | 236 | SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) |
1da177e4 LT |
237 | { |
238 | return -ENOSYS; | |
239 | } | |
240 | ||
241 | /* | |
242 | * If we ever come here the user sp is bad. Zap the process right away. | |
243 | * Due to the bad stack signaling wouldn't work. | |
244 | */ | |
245 | asmlinkage void bad_stack(void) | |
246 | { | |
247 | do_exit(SIGSEGV); | |
248 | } |