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
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.
10 #include <linux/capability.h>
11 #include <linux/errno.h>
12 #include <linux/linkage.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>
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>
37 #include <asm/shmparam.h>
38 #include <asm/sysmips.h>
39 #include <asm/uaccess.h>
40 #include <asm/switch_to.h>
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.
49 asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
54 error = do_pipe_flags(fd, 0);
65 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
66 unsigned long, prot, unsigned long, flags, unsigned long,
72 if (offset & ~PAGE_MASK)
75 result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
81 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
82 unsigned long, prot, unsigned long, flags, unsigned long, fd,
85 if (pgoff & (~PAGE_MASK >> 12))
88 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
91 save_static_function(sys_fork);
92 static int __used noinline
93 _sys_fork(nabi_no_regargs struct pt_regs regs)
95 return do_fork(SIGCHLD, regs.regs[29], 0, NULL, NULL);
98 save_static_function(sys_clone);
99 static int __used noinline
100 _sys_clone(nabi_no_regargs struct pt_regs regs)
102 unsigned long clone_flags;
104 int __user *parent_tidptr, *child_tidptr;
106 clone_flags = regs.regs[4];
107 newsp = regs.regs[5];
109 newsp = regs.regs[29];
110 parent_tidptr = (int __user *) regs.regs[6];
112 /* We need to fetch the fifth argument off the stack. */
114 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) {
115 int __user *__user *usp = (int __user *__user *) regs.regs[29];
116 if (regs.regs[2] == __NR_syscall) {
117 if (get_user (child_tidptr, &usp[5]))
120 else if (get_user (child_tidptr, &usp[4]))
124 child_tidptr = (int __user *) regs.regs[8];
126 return do_fork(clone_flags, newsp, 0,
127 parent_tidptr, child_tidptr);
130 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
132 struct thread_info *ti = task_thread_info(current);
135 if (cpu_has_userlocal)
136 write_c0_userlocal(addr);
141 static inline int mips_atomic_set(struct pt_regs *regs,
142 unsigned long addr, unsigned long new)
144 unsigned long old, tmp;
147 if (unlikely(addr & 3))
150 if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
153 if (cpu_has_llsc && R10000_LLSC_WAR) {
154 __asm__ __volatile__ (
157 "1: ll %[old], (%[addr]) \n"
158 " move %[tmp], %[new] \n"
159 "2: sc %[tmp], (%[addr]) \n"
160 " beqzl %[tmp], 1b \n"
162 " .section .fixup,\"ax\" \n"
163 "4: li %[err], %[efault] \n"
166 " .section __ex_table,\"a\" \n"
167 " "STR(PTR)" 1b, 4b \n"
168 " "STR(PTR)" 2b, 4b \n"
176 [efault] "i" (-EFAULT)
178 } else if (cpu_has_llsc) {
179 __asm__ __volatile__ (
182 "1: ll %[old], (%[addr]) \n"
183 " move %[tmp], %[new] \n"
184 "2: sc %[tmp], (%[addr]) \n"
185 " bnez %[tmp], 4f \n"
191 " .section .fixup,\"ax\" \n"
192 "5: li %[err], %[efault] \n"
195 " .section __ex_table,\"a\" \n"
196 " "STR(PTR)" 1b, 5b \n"
197 " "STR(PTR)" 2b, 5b \n"
205 [efault] "i" (-EFAULT)
214 err = __get_user(old, (unsigned int *) addr);
215 err |= __put_user(new, (unsigned int *) addr);
226 regs->regs[7] = 0; /* No error */
229 * Don't let your children do this ...
231 __asm__ __volatile__(
237 /* unreached. Honestly. */
241 save_static_function(sys_sysmips);
242 static int __used noinline
243 _sys_sysmips(nabi_no_regargs struct pt_regs regs)
245 long cmd, arg1, arg2;
252 case MIPS_ATOMIC_SET:
253 return mips_atomic_set(®s, arg1, arg2);
260 set_thread_flag(TIF_FIXADE);
262 clear_thread_flag(TIF_FIXADE);
264 set_thread_flag(TIF_LOGADE);
266 clear_thread_flag(TIF_LOGADE);
279 * No implemented yet ...
281 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
287 * If we ever come here the user sp is bad. Zap the process right away.
288 * Due to the bad stack signaling wouldn't work.
290 asmlinkage void bad_stack(void)