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>
41 #include <asm/sysmips.h>
42 #include <asm/switch_to.h>
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.
51 asmlinkage int sysm_pipe(void)
54 int error = do_pipe_flags(fd, 0);
57 current_pt_regs()->regs[3] = fd[1];
61 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
62 unsigned long, prot, unsigned long, flags, unsigned long,
65 if (offset & ~PAGE_MASK)
67 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
68 offset >> PAGE_SHIFT);
71 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
72 unsigned long, prot, unsigned long, flags, unsigned long, fd,
75 if (pgoff & (~PAGE_MASK >> 12))
78 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
79 pgoff >> (PAGE_SHIFT - 12));
82 save_static_function(sys_fork);
83 save_static_function(sys_clone);
84 save_static_function(sys_clone3);
86 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
88 struct thread_info *ti = task_thread_info(current);
91 if (cpu_has_userlocal)
92 write_c0_userlocal(addr);
97 static inline int mips_atomic_set(unsigned long addr, unsigned long new)
99 unsigned long old, tmp;
100 struct pt_regs *regs;
103 if (unlikely(addr & 3))
106 if (unlikely(!access_ok((const void __user *)addr, 4)))
109 if (cpu_has_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) {
110 __asm__ __volatile__ (
112 " .set arch=r4000 \n"
114 "1: ll %[old], (%[addr]) \n"
115 " move %[tmp], %[new] \n"
116 "2: sc %[tmp], (%[addr]) \n"
117 " beqzl %[tmp], 1b \n"
120 " .section .fixup,\"ax\" \n"
121 "4: li %[err], %[efault] \n"
124 " .section __ex_table,\"a\" \n"
125 " "STR(PTR_WD)" 1b, 4b \n"
126 " "STR(PTR_WD)" 2b, 4b \n"
134 [efault] "i" (-EFAULT)
136 } else if (cpu_has_llsc) {
137 __asm__ __volatile__ (
139 " .set "MIPS_ISA_ARCH_LEVEL" \n"
142 " " __SYNC(full, loongson3_war) " \n"
143 user_ll("%[old]", "(%[addr])")
144 " move %[tmp], %[new] \n"
146 user_sc("%[tmp]", "(%[addr])")
147 " beqz %[tmp], 1b \n"
150 " .section .fixup,\"ax\" \n"
151 "5: li %[err], %[efault] \n"
154 " .section __ex_table,\"a\" \n"
155 " "STR(PTR_WD)" 1b, 5b \n"
156 " "STR(PTR_WD)" 2b, 5b \n"
164 [efault] "i" (-EFAULT)
173 err = __get_user(old, (unsigned int *) addr);
174 err |= __put_user(new, (unsigned int *) addr);
184 regs = current_pt_regs();
186 regs->regs[7] = 0; /* No error */
189 * Don't let your children do this ...
191 __asm__ __volatile__(
197 /* unreached. Honestly. */
202 * mips_atomic_set() normally returns directly via syscall_exit potentially
203 * clobbering static registers, so be sure to preserve them.
205 save_static_function(sys_sysmips);
207 SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2)
210 case MIPS_ATOMIC_SET:
211 return mips_atomic_set(arg1, arg2);
218 set_thread_flag(TIF_FIXADE);
220 clear_thread_flag(TIF_FIXADE);
222 set_thread_flag(TIF_LOGADE);
224 clear_thread_flag(TIF_LOGADE);
237 * No implemented yet ...
239 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)