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], ®s, 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, ®s, 0,
127 parent_tidptr, child_tidptr);
131 * sys_execve() executes a new program.
133 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
136 struct filename *filename;
138 filename = getname((const char __user *) (long)regs.regs[4]);
139 error = PTR_ERR(filename);
140 if (IS_ERR(filename))
142 error = do_execve(filename->name,
143 (const char __user *const __user *) (long)regs.regs[5],
144 (const char __user *const __user *) (long)regs.regs[6],
152 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
154 struct thread_info *ti = task_thread_info(current);
157 if (cpu_has_userlocal)
158 write_c0_userlocal(addr);
163 static inline int mips_atomic_set(struct pt_regs *regs,
164 unsigned long addr, unsigned long new)
166 unsigned long old, tmp;
169 if (unlikely(addr & 3))
172 if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
175 if (cpu_has_llsc && R10000_LLSC_WAR) {
176 __asm__ __volatile__ (
179 "1: ll %[old], (%[addr]) \n"
180 " move %[tmp], %[new] \n"
181 "2: sc %[tmp], (%[addr]) \n"
182 " beqzl %[tmp], 1b \n"
184 " .section .fixup,\"ax\" \n"
185 "4: li %[err], %[efault] \n"
188 " .section __ex_table,\"a\" \n"
189 " "STR(PTR)" 1b, 4b \n"
190 " "STR(PTR)" 2b, 4b \n"
198 [efault] "i" (-EFAULT)
200 } else if (cpu_has_llsc) {
201 __asm__ __volatile__ (
204 "1: ll %[old], (%[addr]) \n"
205 " move %[tmp], %[new] \n"
206 "2: sc %[tmp], (%[addr]) \n"
207 " bnez %[tmp], 4f \n"
213 " .section .fixup,\"ax\" \n"
214 "5: li %[err], %[efault] \n"
217 " .section __ex_table,\"a\" \n"
218 " "STR(PTR)" 1b, 5b \n"
219 " "STR(PTR)" 2b, 5b \n"
227 [efault] "i" (-EFAULT)
236 err = __get_user(old, (unsigned int *) addr);
237 err |= __put_user(new, (unsigned int *) addr);
248 regs->regs[7] = 0; /* No error */
251 * Don't let your children do this ...
253 __asm__ __volatile__(
259 /* unreached. Honestly. */
263 save_static_function(sys_sysmips);
264 static int __used noinline
265 _sys_sysmips(nabi_no_regargs struct pt_regs regs)
267 long cmd, arg1, arg2;
274 case MIPS_ATOMIC_SET:
275 return mips_atomic_set(®s, arg1, arg2);
282 set_thread_flag(TIF_FIXADE);
284 clear_thread_flag(TIF_FIXADE);
286 set_thread_flag(TIF_LOGADE);
288 clear_thread_flag(TIF_LOGADE);
301 * No implemented yet ...
303 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
309 * If we ever come here the user sp is bad. Zap the process right away.
310 * Due to the bad stack signaling wouldn't work.
312 asmlinkage void bad_stack(void)
318 * Do a system call from kernel instead of calling sys_execve so we
319 * end up with proper pt_regs.
321 int kernel_execve(const char *filename,
322 const char *const argv[],
323 const char *const envp[])
325 register unsigned long __a0 asm("$4") = (unsigned long) filename;
326 register unsigned long __a1 asm("$5") = (unsigned long) argv;
327 register unsigned long __a2 asm("$6") = (unsigned long) envp;
328 register unsigned long __a3 asm("$7");
331 __asm__ volatile (" \n"
333 " li $2, %5 # __NR_execve \n"
337 : "=&r" (__v0), "=r" (__a3)
338 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
339 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",