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>
29 #include <linux/sched/task_stack.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>
39 #include <asm/shmparam.h>
40 #include <asm/sysmips.h>
41 #include <asm/switch_to.h>
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.
50 asmlinkage int sysm_pipe(void)
53 int error = do_pipe_flags(fd, 0);
56 current_pt_regs()->regs[3] = fd[1];
60 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
61 unsigned long, prot, unsigned long, flags, unsigned long,
64 if (offset & ~PAGE_MASK)
66 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
67 offset >> PAGE_SHIFT);
70 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
71 unsigned long, prot, unsigned long, flags, unsigned long, fd,
74 if (pgoff & (~PAGE_MASK >> 12))
77 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
78 pgoff >> (PAGE_SHIFT - 12));
81 save_static_function(sys_fork);
82 save_static_function(sys_clone);
83 save_static_function(sys_clone3);
85 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
87 struct thread_info *ti = task_thread_info(current);
90 if (cpu_has_userlocal)
91 write_c0_userlocal(addr);
96 static inline int mips_atomic_set(unsigned long addr, unsigned long new)
98 unsigned long old, tmp;
102 if (unlikely(addr & 3))
105 if (unlikely(!access_ok((const void __user *)addr, 4)))
108 if (cpu_has_llsc && R10000_LLSC_WAR) {
109 __asm__ __volatile__ (
111 " .set arch=r4000 \n"
113 "1: ll %[old], (%[addr]) \n"
114 " move %[tmp], %[new] \n"
115 "2: sc %[tmp], (%[addr]) \n"
116 " beqzl %[tmp], 1b \n"
119 " .section .fixup,\"ax\" \n"
120 "4: li %[err], %[efault] \n"
123 " .section __ex_table,\"a\" \n"
124 " "STR(PTR)" 1b, 4b \n"
125 " "STR(PTR)" 2b, 4b \n"
133 [efault] "i" (-EFAULT)
135 } else if (cpu_has_llsc) {
137 __asm__ __volatile__ (
139 " .set "MIPS_ISA_ARCH_LEVEL" \n"
142 user_ll("%[old]", "(%[addr])")
143 " move %[tmp], %[new] \n"
145 user_sc("%[tmp]", "(%[addr])")
146 " beqz %[tmp], 1b \n"
149 " .section .fixup,\"ax\" \n"
150 "5: li %[err], %[efault] \n"
153 " .section __ex_table,\"a\" \n"
154 " "STR(PTR)" 1b, 5b \n"
155 " "STR(PTR)" 2b, 5b \n"
163 [efault] "i" (-EFAULT)
172 err = __get_user(old, (unsigned int *) addr);
173 err |= __put_user(new, (unsigned int *) addr);
183 regs = current_pt_regs();
185 regs->regs[7] = 0; /* No error */
188 * Don't let your children do this ...
190 __asm__ __volatile__(
196 /* unreached. Honestly. */
201 * mips_atomic_set() normally returns directly via syscall_exit potentially
202 * clobbering static registers, so be sure to preserve them.
204 save_static_function(sys_sysmips);
206 SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2)
209 case MIPS_ATOMIC_SET:
210 return mips_atomic_set(arg1, arg2);
217 set_thread_flag(TIF_FIXADE);
219 clear_thread_flag(TIF_FIXADE);
221 set_thread_flag(TIF_LOGADE);
223 clear_thread_flag(TIF_LOGADE);
236 * No implemented yet ...
238 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
244 * If we ever come here the user sp is bad. Zap the process right away.
245 * Due to the bad stack signaling wouldn't work.
247 asmlinkage void bad_stack(void)