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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/sync.h>
41#include <asm/sysmips.h>
42#include <asm/switch_to.h>
43
44/*
45 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
46 * convention. It returns results in registers $v0 / $v1 which means there
47 * is no need for it to do verify the validity of a userspace pointer
48 * argument. Historically that used to be expensive in Linux. These days
49 * the performance advantage is negligible.
50 */
51asmlinkage int sysm_pipe(void)
52{
53 int fd[2];
54 int error = do_pipe_flags(fd, 0);
55 if (error)
56 return error;
57 current_pt_regs()->regs[3] = fd[1];
58 return fd[0];
59}
60
61SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
62 unsigned long, prot, unsigned long, flags, unsigned long,
63 fd, off_t, offset)
64{
65 if (offset & ~PAGE_MASK)
66 return -EINVAL;
67 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
68 offset >> PAGE_SHIFT);
69}
70
71SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
72 unsigned long, prot, unsigned long, flags, unsigned long, fd,
73 unsigned long, pgoff)
74{
75 if (pgoff & (~PAGE_MASK >> 12))
76 return -EINVAL;
77
78 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
79 pgoff >> (PAGE_SHIFT - 12));
80}
81
82save_static_function(sys_fork);
83save_static_function(sys_clone);
84save_static_function(sys_clone3);
85
86SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
87{
88 struct thread_info *ti = task_thread_info(current);
89
90 ti->tp_value = addr;
91 if (cpu_has_userlocal)
92 write_c0_userlocal(addr);
93
94 return 0;
95}
96
97static inline int mips_atomic_set(unsigned long addr, unsigned long new)
98{
99 unsigned long old, tmp;
100 struct pt_regs *regs;
101 unsigned int err;
102
103 if (unlikely(addr & 3))
104 return -EINVAL;
105
106 if (unlikely(!access_ok((const void __user *)addr, 4)))
107 return -EINVAL;
108
109 if (cpu_has_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) {
110 __asm__ __volatile__ (
111 " .set push \n"
112 " .set arch=r4000 \n"
113 " li %[err], 0 \n"
114 "1: ll %[old], (%[addr]) \n"
115 " move %[tmp], %[new] \n"
116 "2: sc %[tmp], (%[addr]) \n"
117 " beqzl %[tmp], 1b \n"
118 "3: \n"
119 " .insn \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 pop \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 push \n"
139 " .set "MIPS_ISA_ARCH_LEVEL" \n"
140 " li %[err], 0 \n"
141 "1: \n"
142 " " __SYNC(full, loongson3_war) " \n"
143 user_ll("%[old]", "(%[addr])")
144 " move %[tmp], %[new] \n"
145 "2: \n"
146 user_sc("%[tmp]", "(%[addr])")
147 " beqz %[tmp], 1b \n"
148 "3: \n"
149 " .insn \n"
150 " .section .fixup,\"ax\" \n"
151 "5: li %[err], %[efault] \n"
152 " j 3b \n"
153 " .previous \n"
154 " .section __ex_table,\"a\" \n"
155 " "STR(PTR)" 1b, 5b \n"
156 " "STR(PTR)" 2b, 5b \n"
157 " .previous \n"
158 " .set pop \n"
159 : [old] "=&r" (old),
160 [err] "=&r" (err),
161 [tmp] "=&r" (tmp)
162 : [addr] "r" (addr),
163 [new] "r" (new),
164 [efault] "i" (-EFAULT)
165 : "memory");
166 } else {
167 do {
168 preempt_disable();
169 ll_bit = 1;
170 ll_task = current;
171 preempt_enable();
172
173 err = __get_user(old, (unsigned int *) addr);
174 err |= __put_user(new, (unsigned int *) addr);
175 if (err)
176 break;
177 rmb();
178 } while (!ll_bit);
179 }
180
181 if (unlikely(err))
182 return err;
183
184 regs = current_pt_regs();
185 regs->regs[2] = old;
186 regs->regs[7] = 0; /* No error */
187
188 /*
189 * Don't let your children do this ...
190 */
191 __asm__ __volatile__(
192 " move $29, %0 \n"
193 " j syscall_exit \n"
194 : /* no outputs */
195 : "r" (regs));
196
197 /* unreached. Honestly. */
198 unreachable();
199}
200
201/*
202 * mips_atomic_set() normally returns directly via syscall_exit potentially
203 * clobbering static registers, so be sure to preserve them.
204 */
205save_static_function(sys_sysmips);
206
207SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2)
208{
209 switch (cmd) {
210 case MIPS_ATOMIC_SET:
211 return mips_atomic_set(arg1, arg2);
212
213 case MIPS_FIXADE:
214 if (arg1 & ~3)
215 return -EINVAL;
216
217 if (arg1 & 1)
218 set_thread_flag(TIF_FIXADE);
219 else
220 clear_thread_flag(TIF_FIXADE);
221 if (arg1 & 2)
222 set_thread_flag(TIF_LOGADE);
223 else
224 clear_thread_flag(TIF_LOGADE);
225
226 return 0;
227
228 case FLUSH_CACHE:
229 __flush_cache_all();
230 return 0;
231 }
232
233 return -EINVAL;
234}
235
236/*
237 * No implemented yet ...
238 */
239SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
240{
241 return -ENOSYS;
242}
243
244/*
245 * If we ever come here the user sp is bad. Zap the process right away.
246 * Due to the bad stack signaling wouldn't work.
247 */
248asmlinkage void bad_stack(void)
249{
250 do_exit(SIGSEGV);
251}
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
41/*
42 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
43 * convention. It returns results in registers $v0 / $v1 which means there
44 * is no need for it to do verify the validity of a userspace pointer
45 * argument. Historically that used to be expensive in Linux. These days
46 * the performance advantage is negligible.
47 */
48asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
49{
50 int fd[2];
51 int error, res;
52
53 error = do_pipe_flags(fd, 0);
54 if (error) {
55 res = error;
56 goto out;
57 }
58 regs.regs[3] = fd[1];
59 res = fd[0];
60out:
61 return res;
62}
63
64SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
65 unsigned long, prot, unsigned long, flags, unsigned long,
66 fd, off_t, offset)
67{
68 unsigned long result;
69
70 result = -EINVAL;
71 if (offset & ~PAGE_MASK)
72 goto out;
73
74 result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
75
76out:
77 return result;
78}
79
80SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
81 unsigned long, prot, unsigned long, flags, unsigned long, fd,
82 unsigned long, pgoff)
83{
84 if (pgoff & (~PAGE_MASK >> 12))
85 return -EINVAL;
86
87 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
88}
89
90save_static_function(sys_fork);
91static int __used noinline
92_sys_fork(nabi_no_regargs struct pt_regs regs)
93{
94 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL);
95}
96
97save_static_function(sys_clone);
98static int __used noinline
99_sys_clone(nabi_no_regargs struct pt_regs regs)
100{
101 unsigned long clone_flags;
102 unsigned long newsp;
103 int __user *parent_tidptr, *child_tidptr;
104
105 clone_flags = regs.regs[4];
106 newsp = regs.regs[5];
107 if (!newsp)
108 newsp = regs.regs[29];
109 parent_tidptr = (int __user *) regs.regs[6];
110#ifdef CONFIG_32BIT
111 /* We need to fetch the fifth argument off the stack. */
112 child_tidptr = NULL;
113 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) {
114 int __user *__user *usp = (int __user *__user *) regs.regs[29];
115 if (regs.regs[2] == __NR_syscall) {
116 if (get_user (child_tidptr, &usp[5]))
117 return -EFAULT;
118 }
119 else if (get_user (child_tidptr, &usp[4]))
120 return -EFAULT;
121 }
122#else
123 child_tidptr = (int __user *) regs.regs[8];
124#endif
125 return do_fork(clone_flags, newsp, ®s, 0,
126 parent_tidptr, child_tidptr);
127}
128
129/*
130 * sys_execve() executes a new program.
131 */
132asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
133{
134 int error;
135 char * filename;
136
137 filename = getname((const char __user *) (long)regs.regs[4]);
138 error = PTR_ERR(filename);
139 if (IS_ERR(filename))
140 goto out;
141 error = do_execve(filename,
142 (const char __user *const __user *) (long)regs.regs[5],
143 (const char __user *const __user *) (long)regs.regs[6],
144 ®s);
145 putname(filename);
146
147out:
148 return error;
149}
150
151SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
152{
153 struct thread_info *ti = task_thread_info(current);
154
155 ti->tp_value = addr;
156 if (cpu_has_userlocal)
157 write_c0_userlocal(addr);
158
159 return 0;
160}
161
162static inline int mips_atomic_set(struct pt_regs *regs,
163 unsigned long addr, unsigned long new)
164{
165 unsigned long old, tmp;
166 unsigned int err;
167
168 if (unlikely(addr & 3))
169 return -EINVAL;
170
171 if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
172 return -EINVAL;
173
174 if (cpu_has_llsc && R10000_LLSC_WAR) {
175 __asm__ __volatile__ (
176 " .set mips3 \n"
177 " li %[err], 0 \n"
178 "1: ll %[old], (%[addr]) \n"
179 " move %[tmp], %[new] \n"
180 "2: sc %[tmp], (%[addr]) \n"
181 " beqzl %[tmp], 1b \n"
182 "3: \n"
183 " .section .fixup,\"ax\" \n"
184 "4: li %[err], %[efault] \n"
185 " j 3b \n"
186 " .previous \n"
187 " .section __ex_table,\"a\" \n"
188 " "STR(PTR)" 1b, 4b \n"
189 " "STR(PTR)" 2b, 4b \n"
190 " .previous \n"
191 " .set mips0 \n"
192 : [old] "=&r" (old),
193 [err] "=&r" (err),
194 [tmp] "=&r" (tmp)
195 : [addr] "r" (addr),
196 [new] "r" (new),
197 [efault] "i" (-EFAULT)
198 : "memory");
199 } else if (cpu_has_llsc) {
200 __asm__ __volatile__ (
201 " .set mips3 \n"
202 " li %[err], 0 \n"
203 "1: ll %[old], (%[addr]) \n"
204 " move %[tmp], %[new] \n"
205 "2: sc %[tmp], (%[addr]) \n"
206 " bnez %[tmp], 4f \n"
207 "3: \n"
208 " .subsection 2 \n"
209 "4: b 1b \n"
210 " .previous \n"
211 " \n"
212 " .section .fixup,\"ax\" \n"
213 "5: li %[err], %[efault] \n"
214 " j 3b \n"
215 " .previous \n"
216 " .section __ex_table,\"a\" \n"
217 " "STR(PTR)" 1b, 5b \n"
218 " "STR(PTR)" 2b, 5b \n"
219 " .previous \n"
220 " .set mips0 \n"
221 : [old] "=&r" (old),
222 [err] "=&r" (err),
223 [tmp] "=&r" (tmp)
224 : [addr] "r" (addr),
225 [new] "r" (new),
226 [efault] "i" (-EFAULT)
227 : "memory");
228 } else {
229 do {
230 preempt_disable();
231 ll_bit = 1;
232 ll_task = current;
233 preempt_enable();
234
235 err = __get_user(old, (unsigned int *) addr);
236 err |= __put_user(new, (unsigned int *) addr);
237 if (err)
238 break;
239 rmb();
240 } while (!ll_bit);
241 }
242
243 if (unlikely(err))
244 return err;
245
246 regs->regs[2] = old;
247 regs->regs[7] = 0; /* No error */
248
249 /*
250 * Don't let your children do this ...
251 */
252 __asm__ __volatile__(
253 " move $29, %0 \n"
254 " j syscall_exit \n"
255 : /* no outputs */
256 : "r" (regs));
257
258 /* unreached. Honestly. */
259 while (1);
260}
261
262save_static_function(sys_sysmips);
263static int __used noinline
264_sys_sysmips(nabi_no_regargs struct pt_regs regs)
265{
266 long cmd, arg1, arg2;
267
268 cmd = regs.regs[4];
269 arg1 = regs.regs[5];
270 arg2 = regs.regs[6];
271
272 switch (cmd) {
273 case MIPS_ATOMIC_SET:
274 return mips_atomic_set(®s, arg1, arg2);
275
276 case MIPS_FIXADE:
277 if (arg1 & ~3)
278 return -EINVAL;
279
280 if (arg1 & 1)
281 set_thread_flag(TIF_FIXADE);
282 else
283 clear_thread_flag(TIF_FIXADE);
284 if (arg1 & 2)
285 set_thread_flag(TIF_LOGADE);
286 else
287 clear_thread_flag(TIF_LOGADE);
288
289 return 0;
290
291 case FLUSH_CACHE:
292 __flush_cache_all();
293 return 0;
294 }
295
296 return -EINVAL;
297}
298
299/*
300 * No implemented yet ...
301 */
302SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
303{
304 return -ENOSYS;
305}
306
307/*
308 * If we ever come here the user sp is bad. Zap the process right away.
309 * Due to the bad stack signaling wouldn't work.
310 */
311asmlinkage void bad_stack(void)
312{
313 do_exit(SIGSEGV);
314}
315
316/*
317 * Do a system call from kernel instead of calling sys_execve so we
318 * end up with proper pt_regs.
319 */
320int kernel_execve(const char *filename,
321 const char *const argv[],
322 const char *const envp[])
323{
324 register unsigned long __a0 asm("$4") = (unsigned long) filename;
325 register unsigned long __a1 asm("$5") = (unsigned long) argv;
326 register unsigned long __a2 asm("$6") = (unsigned long) envp;
327 register unsigned long __a3 asm("$7");
328 unsigned long __v0;
329
330 __asm__ volatile (" \n"
331 " .set noreorder \n"
332 " li $2, %5 # __NR_execve \n"
333 " syscall \n"
334 " move %0, $2 \n"
335 " .set reorder \n"
336 : "=&r" (__v0), "=r" (__a3)
337 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
338 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
339 "memory");
340
341 if (__a3 == 0)
342 return __v0;
343
344 return -__v0;
345}