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 sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
69 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
70 unsigned long, prot, unsigned long, flags, unsigned long, fd,
73 if (pgoff & (~PAGE_MASK >> 12))
76 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
79 save_static_function(sys_fork);
80 save_static_function(sys_clone);
82 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
84 struct thread_info *ti = task_thread_info(current);
87 if (cpu_has_userlocal)
88 write_c0_userlocal(addr);
93 static inline int mips_atomic_set(unsigned long addr, unsigned long new)
95 unsigned long old, tmp;
99 if (unlikely(addr & 3))
102 if (unlikely(!access_ok(VERIFY_WRITE, (const void __user *)addr, 4)))
105 if (cpu_has_llsc && R10000_LLSC_WAR) {
106 __asm__ __volatile__ (
107 " .set arch=r4000 \n"
109 "1: ll %[old], (%[addr]) \n"
110 " move %[tmp], %[new] \n"
111 "2: sc %[tmp], (%[addr]) \n"
112 " beqzl %[tmp], 1b \n"
115 " .section .fixup,\"ax\" \n"
116 "4: li %[err], %[efault] \n"
119 " .section __ex_table,\"a\" \n"
120 " "STR(PTR)" 1b, 4b \n"
121 " "STR(PTR)" 2b, 4b \n"
129 [efault] "i" (-EFAULT)
131 } else if (cpu_has_llsc) {
132 __asm__ __volatile__ (
133 " .set "MIPS_ISA_ARCH_LEVEL" \n"
136 user_ll("%[old]", "(%[addr])")
137 " move %[tmp], %[new] \n"
139 user_sc("%[tmp]", "(%[addr])")
140 " beqz %[tmp], 1b \n"
143 " .section .fixup,\"ax\" \n"
144 "5: li %[err], %[efault] \n"
147 " .section __ex_table,\"a\" \n"
148 " "STR(PTR)" 1b, 5b \n"
149 " "STR(PTR)" 2b, 5b \n"
157 [efault] "i" (-EFAULT)
166 err = __get_user(old, (unsigned int *) addr);
167 err |= __put_user(new, (unsigned int *) addr);
177 regs = current_pt_regs();
179 regs->regs[7] = 0; /* No error */
182 * Don't let your children do this ...
184 __asm__ __volatile__(
190 /* unreached. Honestly. */
195 * mips_atomic_set() normally returns directly via syscall_exit potentially
196 * clobbering static registers, so be sure to preserve them.
198 save_static_function(sys_sysmips);
200 SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2)
203 case MIPS_ATOMIC_SET:
204 return mips_atomic_set(arg1, arg2);
211 set_thread_flag(TIF_FIXADE);
213 clear_thread_flag(TIF_FIXADE);
215 set_thread_flag(TIF_LOGADE);
217 clear_thread_flag(TIF_LOGADE);
230 * No implemented yet ...
232 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)