Loading...
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 */
10#include <linux/capability.h>
11#include <linux/errno.h>
12#include <linux/linkage.h>
13#include <linux/fs.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>
30
31#include <asm/asm.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>
38#include <asm/sim.h>
39#include <asm/shmparam.h>
40#include <asm/sysmips.h>
41#include <asm/switch_to.h>
42
43/*
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.
49 */
50asmlinkage int sysm_pipe(void)
51{
52 int fd[2];
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];
58}
59
60SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
61 unsigned long, prot, unsigned long, flags, unsigned long,
62 fd, off_t, offset)
63{
64 if (offset & ~PAGE_MASK)
65 return -EINVAL;
66 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
67 offset >> PAGE_SHIFT);
68}
69
70SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
71 unsigned long, prot, unsigned long, flags, unsigned long, fd,
72 unsigned long, pgoff)
73{
74 if (pgoff & (~PAGE_MASK >> 12))
75 return -EINVAL;
76
77 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
78 pgoff >> (PAGE_SHIFT - 12));
79}
80
81save_static_function(sys_fork);
82save_static_function(sys_clone);
83
84SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
85{
86 struct thread_info *ti = task_thread_info(current);
87
88 ti->tp_value = addr;
89 if (cpu_has_userlocal)
90 write_c0_userlocal(addr);
91
92 return 0;
93}
94
95static inline int mips_atomic_set(unsigned long addr, unsigned long new)
96{
97 unsigned long old, tmp;
98 struct pt_regs *regs;
99 unsigned int err;
100
101 if (unlikely(addr & 3))
102 return -EINVAL;
103
104 if (unlikely(!access_ok(VERIFY_WRITE, (const void __user *)addr, 4)))
105 return -EINVAL;
106
107 if (cpu_has_llsc && R10000_LLSC_WAR) {
108 __asm__ __volatile__ (
109 " .set arch=r4000 \n"
110 " li %[err], 0 \n"
111 "1: ll %[old], (%[addr]) \n"
112 " move %[tmp], %[new] \n"
113 "2: sc %[tmp], (%[addr]) \n"
114 " beqzl %[tmp], 1b \n"
115 "3: \n"
116 " .insn \n"
117 " .section .fixup,\"ax\" \n"
118 "4: li %[err], %[efault] \n"
119 " j 3b \n"
120 " .previous \n"
121 " .section __ex_table,\"a\" \n"
122 " "STR(PTR)" 1b, 4b \n"
123 " "STR(PTR)" 2b, 4b \n"
124 " .previous \n"
125 " .set mips0 \n"
126 : [old] "=&r" (old),
127 [err] "=&r" (err),
128 [tmp] "=&r" (tmp)
129 : [addr] "r" (addr),
130 [new] "r" (new),
131 [efault] "i" (-EFAULT)
132 : "memory");
133 } else if (cpu_has_llsc) {
134 __asm__ __volatile__ (
135 " .set "MIPS_ISA_ARCH_LEVEL" \n"
136 " li %[err], 0 \n"
137 "1: \n"
138 user_ll("%[old]", "(%[addr])")
139 " move %[tmp], %[new] \n"
140 "2: \n"
141 user_sc("%[tmp]", "(%[addr])")
142 " beqz %[tmp], 1b \n"
143 "3: \n"
144 " .insn \n"
145 " .section .fixup,\"ax\" \n"
146 "5: li %[err], %[efault] \n"
147 " j 3b \n"
148 " .previous \n"
149 " .section __ex_table,\"a\" \n"
150 " "STR(PTR)" 1b, 5b \n"
151 " "STR(PTR)" 2b, 5b \n"
152 " .previous \n"
153 " .set mips0 \n"
154 : [old] "=&r" (old),
155 [err] "=&r" (err),
156 [tmp] "=&r" (tmp)
157 : [addr] "r" (addr),
158 [new] "r" (new),
159 [efault] "i" (-EFAULT)
160 : "memory");
161 } else {
162 do {
163 preempt_disable();
164 ll_bit = 1;
165 ll_task = current;
166 preempt_enable();
167
168 err = __get_user(old, (unsigned int *) addr);
169 err |= __put_user(new, (unsigned int *) addr);
170 if (err)
171 break;
172 rmb();
173 } while (!ll_bit);
174 }
175
176 if (unlikely(err))
177 return err;
178
179 regs = current_pt_regs();
180 regs->regs[2] = old;
181 regs->regs[7] = 0; /* No error */
182
183 /*
184 * Don't let your children do this ...
185 */
186 __asm__ __volatile__(
187 " move $29, %0 \n"
188 " j syscall_exit \n"
189 : /* no outputs */
190 : "r" (regs));
191
192 /* unreached. Honestly. */
193 unreachable();
194}
195
196/*
197 * mips_atomic_set() normally returns directly via syscall_exit potentially
198 * clobbering static registers, so be sure to preserve them.
199 */
200save_static_function(sys_sysmips);
201
202SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2)
203{
204 switch (cmd) {
205 case MIPS_ATOMIC_SET:
206 return mips_atomic_set(arg1, arg2);
207
208 case MIPS_FIXADE:
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
219 clear_thread_flag(TIF_LOGADE);
220
221 return 0;
222
223 case FLUSH_CACHE:
224 __flush_cache_all();
225 return 0;
226 }
227
228 return -EINVAL;
229}
230
231/*
232 * No implemented yet ...
233 */
234SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
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 */
243asmlinkage void bad_stack(void)
244{
245 do_exit(SIGSEGV);
246}
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 */
10#include <linux/capability.h>
11#include <linux/errno.h>
12#include <linux/linkage.h>
13#include <linux/fs.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
30#include <asm/asm.h>
31#include <asm/branch.h>
32#include <asm/cachectl.h>
33#include <asm/cacheflush.h>
34#include <asm/asm-offsets.h>
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>
40#include <asm/switch_to.h>
41
42/*
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.
48 */
49asmlinkage int sysm_pipe(void)
50{
51 int fd[2];
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];
57}
58
59SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
60 unsigned long, prot, unsigned long, flags, unsigned long,
61 fd, off_t, offset)
62{
63 unsigned long result;
64
65 result = -EINVAL;
66 if (offset & ~PAGE_MASK)
67 goto out;
68
69 result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
70
71out:
72 return result;
73}
74
75SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
76 unsigned long, prot, unsigned long, flags, unsigned long, fd,
77 unsigned long, pgoff)
78{
79 if (pgoff & (~PAGE_MASK >> 12))
80 return -EINVAL;
81
82 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
83}
84
85save_static_function(sys_fork);
86save_static_function(sys_clone);
87
88SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
89{
90 struct thread_info *ti = task_thread_info(current);
91
92 ti->tp_value = addr;
93 if (cpu_has_userlocal)
94 write_c0_userlocal(addr);
95
96 return 0;
97}
98
99static inline int mips_atomic_set(unsigned long addr, unsigned long new)
100{
101 unsigned long old, tmp;
102 struct pt_regs *regs;
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__ (
113 " .set arch=r4000 \n"
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"
120 " .section .fixup,\"ax\" \n"
121 "4: li %[err], %[efault] \n"
122 " j 3b \n"
123 " .previous \n"
124 " .section __ex_table,\"a\" \n"
125 " "STR(PTR)" 1b, 4b \n"
126 " "STR(PTR)" 2b, 4b \n"
127 " .previous \n"
128 " .set mips0 \n"
129 : [old] "=&r" (old),
130 [err] "=&r" (err),
131 [tmp] "=&r" (tmp)
132 : [addr] "r" (addr),
133 [new] "r" (new),
134 [efault] "i" (-EFAULT)
135 : "memory");
136 } else if (cpu_has_llsc) {
137 __asm__ __volatile__ (
138 " .set arch=r4000 \n"
139 " li %[err], 0 \n"
140 "1: ll %[old], (%[addr]) \n"
141 " move %[tmp], %[new] \n"
142 "2: sc %[tmp], (%[addr]) \n"
143 " bnez %[tmp], 4f \n"
144 "3: \n"
145 " .subsection 2 \n"
146 "4: b 1b \n"
147 " .previous \n"
148 " \n"
149 " .section .fixup,\"ax\" \n"
150 "5: li %[err], %[efault] \n"
151 " j 3b \n"
152 " .previous \n"
153 " .section __ex_table,\"a\" \n"
154 " "STR(PTR)" 1b, 5b \n"
155 " "STR(PTR)" 2b, 5b \n"
156 " .previous \n"
157 " .set mips0 \n"
158 : [old] "=&r" (old),
159 [err] "=&r" (err),
160 [tmp] "=&r" (tmp)
161 : [addr] "r" (addr),
162 [new] "r" (new),
163 [efault] "i" (-EFAULT)
164 : "memory");
165 } else {
166 do {
167 preempt_disable();
168 ll_bit = 1;
169 ll_task = current;
170 preempt_enable();
171
172 err = __get_user(old, (unsigned int *) addr);
173 err |= __put_user(new, (unsigned int *) addr);
174 if (err)
175 break;
176 rmb();
177 } while (!ll_bit);
178 }
179
180 if (unlikely(err))
181 return err;
182
183 regs = current_pt_regs();
184 regs->regs[2] = old;
185 regs->regs[7] = 0; /* No error */
186
187 /*
188 * Don't let your children do this ...
189 */
190 __asm__ __volatile__(
191 " move $29, %0 \n"
192 " j syscall_exit \n"
193 : /* no outputs */
194 : "r" (regs));
195
196 /* unreached. Honestly. */
197 unreachable();
198}
199
200SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2)
201{
202 switch (cmd) {
203 case MIPS_ATOMIC_SET:
204 return mips_atomic_set(arg1, arg2);
205
206 case MIPS_FIXADE:
207 if (arg1 & ~3)
208 return -EINVAL;
209
210 if (arg1 & 1)
211 set_thread_flag(TIF_FIXADE);
212 else
213 clear_thread_flag(TIF_FIXADE);
214 if (arg1 & 2)
215 set_thread_flag(TIF_LOGADE);
216 else
217 clear_thread_flag(TIF_LOGADE);
218
219 return 0;
220
221 case FLUSH_CACHE:
222 __flush_cache_all();
223 return 0;
224 }
225
226 return -EINVAL;
227}
228
229/*
230 * No implemented yet ...
231 */
232SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
233{
234 return -ENOSYS;
235}
236
237/*
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.
240 */
241asmlinkage void bad_stack(void)
242{
243 do_exit(SIGSEGV);
244}