blob: 53a7ef9a8f320c5b14c5abb2d3e1518c0ad7f756 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Randy Dunlapa9415642006-01-11 12:17:48 -080010#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/errno.h>
12#include <linux/linkage.h>
Alexey Dobriyan4e950f62007-07-30 02:36:13 +040013#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/string.h>
17#include <linux/syscalls.h>
18#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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>
Adrian Bunkcba4fbb2007-10-16 23:29:24 -070025#include <linux/ipc.h>
Ralf Baechlef1e39a42009-09-17 02:25:05 +020026#include <linux/uaccess.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
David Daney652b14a2010-07-19 13:14:57 -070028#include <linux/elf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Ralf Baechlef1e39a42009-09-17 02:25:05 +020030#include <asm/asm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/branch.h>
32#include <asm/cachectl.h>
33#include <asm/cacheflush.h>
Sam Ravnborg048eb582005-09-09 22:32:31 +020034#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <asm/signal.h>
36#include <asm/sim.h>
37#include <asm/shmparam.h>
38#include <asm/sysmips.h>
39#include <asm/uaccess.h>
David Howellsb81947c2012-03-28 18:30:02 +010040#include <asm/switch_to.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Ralf Baechle8213bbf2008-07-20 13:16:46 +010042/*
43 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
Ralf Baechle70342282013-01-22 12:59:30 +010044 * convention. It returns results in registers $v0 / $v1 which means there
Ralf Baechle8213bbf2008-07-20 13:16:46 +010045 * is no need for it to do verify the validity of a userspace pointer
Ralf Baechle70342282013-01-22 12:59:30 +010046 * argument. Historically that used to be expensive in Linux. These days
Ralf Baechle8213bbf2008-07-20 13:16:46 +010047 * the performance advantage is negligible.
48 */
Al Viro974fdb32012-12-23 20:18:28 -050049asmlinkage int sysm_pipe(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
51 int fd[2];
Al Viro974fdb32012-12-23 20:18:28 -050052 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];
Linus Torvalds1da177e2005-04-16 15:20:36 -070057}
58
Ralf Baechledbda6ac2009-02-08 16:00:26 +000059SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
60 unsigned long, prot, unsigned long, flags, unsigned long,
61 fd, off_t, offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 unsigned long result;
64
65 result = -EINVAL;
66 if (offset & ~PAGE_MASK)
67 goto out;
68
Al Virof8b72562009-11-30 17:37:04 -050069 result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71out:
72 return result;
73}
74
Ralf Baechledbda6ac2009-02-08 16:00:26 +000075SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
76 unsigned long, prot, unsigned long, flags, unsigned long, fd,
77 unsigned long, pgoff)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
H. Peter Anvin947df172006-02-24 21:20:29 -080079 if (pgoff & (~PAGE_MASK >> 12))
80 return -EINVAL;
81
Al Virof8b72562009-11-30 17:37:04 -050082 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
85save_static_function(sys_fork);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086save_static_function(sys_clone);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Ralf Baechledbda6ac2009-02-08 16:00:26 +000088SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
Ralf Baechle3c370262005-04-13 17:43:59 +000089{
Al Virodc8f6022006-01-12 01:06:07 -080090 struct thread_info *ti = task_thread_info(current);
Ralf Baechle3c370262005-04-13 17:43:59 +000091
92 ti->tp_value = addr;
Ralf Baechlea3692022007-07-10 17:33:02 +010093 if (cpu_has_userlocal)
94 write_c0_userlocal(addr);
Ralf Baechle06be3752006-09-19 17:18:53 +010095
96 return 0;
Ralf Baechle3c370262005-04-13 17:43:59 +000097}
98
Ralf Baechle12890d02012-12-27 16:23:12 +010099static inline int mips_atomic_set(unsigned long addr, unsigned long new)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200101 unsigned long old, tmp;
Ralf Baechle12890d02012-12-27 16:23:12 +0100102 struct pt_regs *regs;
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200103 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__ (
Ralf Baechlea809d462014-03-30 13:20:10 +0200113 " .set arch=r4000 \n"
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200114 " 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"
Maciej W. Rozycki0e525e42014-11-15 22:09:31 +0000120 " .insn \n"
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200121 " .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"
Ralf Baechlea91be9e2009-12-02 11:33:03 +0000129 " .set mips0 \n"
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200130 : [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__ (
Markos Chandrasfee313d2015-01-15 10:34:00 +0000139 " .set "MIPS_ISA_ARCH_LEVEL" \n"
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200140 " 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"
Maciej W. Rozycki0e525e42014-11-15 22:09:31 +0000146 " .insn \n"
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200147 " .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"
Ralf Baechlea91be9e2009-12-02 11:33:03 +0000159 " .set mips0 \n"
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200160 : [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
Ralf Baechle12890d02012-12-27 16:23:12 +0100185 regs = current_pt_regs();
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200186 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. */
Ralf Baechlef2ace932012-12-27 13:37:40 +0100199 unreachable();
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200200}
201
Ralf Baechle12890d02012-12-27 16:23:12 +0100202SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2)
Ralf Baechlef1e39a42009-09-17 02:25:05 +0200203{
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100204 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 case MIPS_ATOMIC_SET:
Ralf Baechle12890d02012-12-27 16:23:12 +0100206 return mips_atomic_set(arg1, arg2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 case MIPS_FIXADE:
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100209 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
Stefan Oberhumere56293b2011-01-17 09:19:53 +0100219 clear_thread_flag(TIF_LOGADE);
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 return 0;
222
223 case FLUSH_CACHE:
224 __flush_cache_all();
225 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
227
228 return -EINVAL;
229}
230
231/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 * No implemented yet ...
233 */
Ralf Baechledbda6ac2009-02-08 16:00:26 +0000234SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235{
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 */
243asmlinkage void bad_stack(void)
244{
245 do_exit(SIGSEGV);
246}