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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> |
1da177e4 | 29 | |
f1e39a4a | 30 | #include <asm/asm.h> |
1da177e4 LT |
31 | #include <asm/branch.h> |
32 | #include <asm/cachectl.h> | |
33 | #include <asm/cacheflush.h> | |
048eb582 | 34 | #include <asm/asm-offsets.h> |
1da177e4 LT |
35 | #include <asm/signal.h> |
36 | #include <asm/sim.h> | |
37 | #include <asm/shmparam.h> | |
38 | #include <asm/sysmips.h> | |
39 | #include <asm/uaccess.h> | |
b81947c6 | 40 | #include <asm/switch_to.h> |
1da177e4 | 41 | |
8213bbf9 RB |
42 | /* |
43 | * For historic reasons the pipe(2) syscall on MIPS has an unusual calling | |
70342287 | 44 | * convention. It returns results in registers $v0 / $v1 which means there |
8213bbf9 | 45 | * is no need for it to do verify the validity of a userspace pointer |
70342287 | 46 | * argument. Historically that used to be expensive in Linux. These days |
8213bbf9 RB |
47 | * the performance advantage is negligible. |
48 | */ | |
974fdb3c | 49 | asmlinkage int sysm_pipe(void) |
1da177e4 LT |
50 | { |
51 | int fd[2]; | |
974fdb3c AV |
52 | int error = do_pipe_flags(fd, 0); |
53 | if (error) | |
54 | return error; | |
55 | current_pt_regs()->regs[3] = fd[1]; | |
56 | return fd[0]; | |
1da177e4 LT |
57 | } |
58 | ||
dbda6ac0 RB |
59 | SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, |
60 | unsigned long, prot, unsigned long, flags, unsigned long, | |
61 | fd, off_t, offset) | |
1da177e4 LT |
62 | { |
63 | unsigned long result; | |
64 | ||
65 | result = -EINVAL; | |
66 | if (offset & ~PAGE_MASK) | |
67 | goto out; | |
68 | ||
f8b72560 | 69 | result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); |
1da177e4 LT |
70 | |
71 | out: | |
72 | return result; | |
73 | } | |
74 | ||
dbda6ac0 RB |
75 | SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, |
76 | unsigned long, prot, unsigned long, flags, unsigned long, fd, | |
77 | unsigned long, pgoff) | |
1da177e4 | 78 | { |
947df17c PA |
79 | if (pgoff & (~PAGE_MASK >> 12)) |
80 | return -EINVAL; | |
81 | ||
f8b72560 | 82 | return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); |
1da177e4 LT |
83 | } |
84 | ||
85 | save_static_function(sys_fork); | |
1da177e4 | 86 | save_static_function(sys_clone); |
1da177e4 | 87 | |
dbda6ac0 | 88 | SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) |
3c37026d | 89 | { |
dc8f6029 | 90 | struct thread_info *ti = task_thread_info(current); |
3c37026d RB |
91 | |
92 | ti->tp_value = addr; | |
a3692020 RB |
93 | if (cpu_has_userlocal) |
94 | write_c0_userlocal(addr); | |
06be375b RB |
95 | |
96 | return 0; | |
3c37026d RB |
97 | } |
98 | ||
12890d0f | 99 | static inline int mips_atomic_set(unsigned long addr, unsigned long new) |
1da177e4 | 100 | { |
f1e39a4a | 101 | unsigned long old, tmp; |
12890d0f | 102 | struct pt_regs *regs; |
f1e39a4a RB |
103 | unsigned int err; |
104 | ||
105 | if (unlikely(addr & 3)) | |
106 | return -EINVAL; | |
107 | ||
108 | if (unlikely(!access_ok(VERIFY_WRITE, addr, 4))) | |
109 | return -EINVAL; | |
110 | ||
111 | if (cpu_has_llsc && R10000_LLSC_WAR) { | |
112 | __asm__ __volatile__ ( | |
a809d460 | 113 | " .set arch=r4000 \n" |
f1e39a4a RB |
114 | " li %[err], 0 \n" |
115 | "1: ll %[old], (%[addr]) \n" | |
116 | " move %[tmp], %[new] \n" | |
117 | "2: sc %[tmp], (%[addr]) \n" | |
118 | " beqzl %[tmp], 1b \n" | |
119 | "3: \n" | |
0e525e48 | 120 | " .insn \n" |
f1e39a4a RB |
121 | " .section .fixup,\"ax\" \n" |
122 | "4: li %[err], %[efault] \n" | |
123 | " j 3b \n" | |
124 | " .previous \n" | |
125 | " .section __ex_table,\"a\" \n" | |
126 | " "STR(PTR)" 1b, 4b \n" | |
127 | " "STR(PTR)" 2b, 4b \n" | |
128 | " .previous \n" | |
a91be9ee | 129 | " .set mips0 \n" |
f1e39a4a RB |
130 | : [old] "=&r" (old), |
131 | [err] "=&r" (err), | |
132 | [tmp] "=&r" (tmp) | |
133 | : [addr] "r" (addr), | |
134 | [new] "r" (new), | |
135 | [efault] "i" (-EFAULT) | |
136 | : "memory"); | |
137 | } else if (cpu_has_llsc) { | |
138 | __asm__ __volatile__ ( | |
fee313d4 | 139 | " .set "MIPS_ISA_ARCH_LEVEL" \n" |
f1e39a4a RB |
140 | " li %[err], 0 \n" |
141 | "1: ll %[old], (%[addr]) \n" | |
142 | " move %[tmp], %[new] \n" | |
143 | "2: sc %[tmp], (%[addr]) \n" | |
144 | " bnez %[tmp], 4f \n" | |
145 | "3: \n" | |
0e525e48 | 146 | " .insn \n" |
f1e39a4a RB |
147 | " .subsection 2 \n" |
148 | "4: b 1b \n" | |
149 | " .previous \n" | |
150 | " \n" | |
151 | " .section .fixup,\"ax\" \n" | |
152 | "5: li %[err], %[efault] \n" | |
153 | " j 3b \n" | |
154 | " .previous \n" | |
155 | " .section __ex_table,\"a\" \n" | |
156 | " "STR(PTR)" 1b, 5b \n" | |
157 | " "STR(PTR)" 2b, 5b \n" | |
158 | " .previous \n" | |
a91be9ee | 159 | " .set mips0 \n" |
f1e39a4a RB |
160 | : [old] "=&r" (old), |
161 | [err] "=&r" (err), | |
162 | [tmp] "=&r" (tmp) | |
163 | : [addr] "r" (addr), | |
164 | [new] "r" (new), | |
165 | [efault] "i" (-EFAULT) | |
166 | : "memory"); | |
167 | } else { | |
168 | do { | |
169 | preempt_disable(); | |
170 | ll_bit = 1; | |
171 | ll_task = current; | |
172 | preempt_enable(); | |
173 | ||
174 | err = __get_user(old, (unsigned int *) addr); | |
175 | err |= __put_user(new, (unsigned int *) addr); | |
176 | if (err) | |
177 | break; | |
178 | rmb(); | |
179 | } while (!ll_bit); | |
180 | } | |
181 | ||
182 | if (unlikely(err)) | |
183 | return err; | |
184 | ||
12890d0f | 185 | regs = current_pt_regs(); |
f1e39a4a RB |
186 | regs->regs[2] = old; |
187 | regs->regs[7] = 0; /* No error */ | |
188 | ||
189 | /* | |
190 | * Don't let your children do this ... | |
191 | */ | |
192 | __asm__ __volatile__( | |
193 | " move $29, %0 \n" | |
194 | " j syscall_exit \n" | |
195 | : /* no outputs */ | |
196 | : "r" (regs)); | |
197 | ||
198 | /* unreached. Honestly. */ | |
f2ace931 | 199 | unreachable(); |
f1e39a4a RB |
200 | } |
201 | ||
12890d0f | 202 | SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) |
f1e39a4a | 203 | { |
293c5bd1 | 204 | switch (cmd) { |
1da177e4 | 205 | case MIPS_ATOMIC_SET: |
12890d0f | 206 | return mips_atomic_set(arg1, arg2); |
1da177e4 LT |
207 | |
208 | case MIPS_FIXADE: | |
293c5bd1 RB |
209 | if (arg1 & ~3) |
210 | return -EINVAL; | |
211 | ||
212 | if (arg1 & 1) | |
213 | set_thread_flag(TIF_FIXADE); | |
214 | else | |
215 | clear_thread_flag(TIF_FIXADE); | |
216 | if (arg1 & 2) | |
217 | set_thread_flag(TIF_LOGADE); | |
218 | else | |
e56293b1 | 219 | clear_thread_flag(TIF_LOGADE); |
293c5bd1 | 220 | |
1da177e4 LT |
221 | return 0; |
222 | ||
223 | case FLUSH_CACHE: | |
224 | __flush_cache_all(); | |
225 | return 0; | |
1da177e4 LT |
226 | } |
227 | ||
228 | return -EINVAL; | |
229 | } | |
230 | ||
1da177e4 LT |
231 | /* |
232 | * No implemented yet ... | |
233 | */ | |
dbda6ac0 | 234 | SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) |
1da177e4 LT |
235 | { |
236 | return -ENOSYS; | |
237 | } | |
238 | ||
239 | /* | |
240 | * If we ever come here the user sp is bad. Zap the process right away. | |
241 | * Due to the bad stack signaling wouldn't work. | |
242 | */ | |
243 | asmlinkage void bad_stack(void) | |
244 | { | |
245 | do_exit(SIGSEGV); | |
246 | } |