1/* 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 4 * for more details. 5 * 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. 9 */ 10#include <linux/capability.h> 11#include <linux/errno.h> 12#include <linux/linkage.h> 13#include <linux/fs.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> 30 31#include <asm/asm.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> 38#include <asm/sim.h> 39#include <asm/shmparam.h> 40#include <asm/sync.h> 41#include <asm/sysmips.h> 42#include <asm/syscalls.h> 43#include <asm/switch_to.h> 44 45/* 46 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling 47 * convention. It returns results in registers $v0 / $v1 which means there 48 * is no need for it to do verify the validity of a userspace pointer 49 * argument. Historically that used to be expensive in Linux. These days 50 * the performance advantage is negligible. 51 */ 52asmlinkage int sysm_pipe(void) 53{ 54 int fd[2]; 55 int error = do_pipe_flags(fd, 0); 56 if (error) 57 return error; 58 current_pt_regs()->regs[3] = fd[1]; 59 return fd[0]; 60} 61 62SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, 63 unsigned long, prot, unsigned long, flags, unsigned long, 64 fd, off_t, offset) 65{ 66 if (offset & ~PAGE_MASK) 67 return -EINVAL; 68 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 69 offset >> PAGE_SHIFT); 70} 71 72SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, 73 unsigned long, prot, unsigned long, flags, unsigned long, fd, 74 unsigned long, pgoff) 75{ 76 if (pgoff & (~PAGE_MASK >> 12)) 77 return -EINVAL; 78 79 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 80 pgoff >> (PAGE_SHIFT - 12)); 81} 82 83save_static_function(sys_fork); 84save_static_function(sys_clone); 85save_static_function(sys_clone3); 86 87SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) 88{ 89 struct thread_info *ti = task_thread_info(current); 90 91 ti->tp_value = addr; 92 if (cpu_has_userlocal) 93 write_c0_userlocal(addr); 94 95 return 0; 96} 97 98static inline int mips_atomic_set(unsigned long addr, unsigned long new) 99{ 100 unsigned long old, tmp; 101 struct pt_regs *regs; 102 unsigned int err; 103 104 if (unlikely(addr & 3)) 105 return -EINVAL; 106 107 if (unlikely(!access_ok((const void __user *)addr, 4))) 108 return -EINVAL; 109 110 if (cpu_has_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) { 111 __asm__ __volatile__ ( 112 " .set push \n" 113 " .set arch=r4000 \n" 114 " li %[err], 0 \n" 115 "1: ll %[old], (%[addr]) \n" 116 " move %[tmp], %[new] \n" 117 "2: sc %[tmp], (%[addr]) \n" 118 " beqzl %[tmp], 1b \n" 119 "3: \n" 120 " .insn \n" 121 " .section .fixup,\"ax\" \n" 122 "4: li %[err], %[efault] \n" 123 " j 3b \n" 124 " .previous \n" 125 " .section __ex_table,\"a\" \n" 126 " "STR(PTR_WD)" 1b, 4b \n" 127 " "STR(PTR_WD)" 2b, 4b \n" 128 " .previous \n" 129 " .set pop \n" 130 : [old] "=&r" (old), 131 [err] "=&r" (err), 132 [tmp] "=&r" (tmp) 133 : [addr] "r" (addr), 134 [new] "r" (new), 135 [efault] "i" (-EFAULT) 136 : "memory"); 137 } else if (cpu_has_llsc) { 138 __asm__ __volatile__ ( 139 " .set push \n" 140 " .set "MIPS_ISA_ARCH_LEVEL" \n" 141 " li %[err], 0 \n" 142 "1: \n" 143 " " __SYNC(full, loongson3_war) " \n" 144 user_ll("%[old]", "(%[addr])") 145 " move %[tmp], %[new] \n" 146 "2: \n" 147 user_sc("%[tmp]", "(%[addr])") 148 " beqz %[tmp], 1b \n" 149 "3: \n" 150 " .insn \n" 151 " .section .fixup,\"ax\" \n" 152 "5: li %[err], %[efault] \n" 153 " j 3b \n" 154 " .previous \n" 155 " .section __ex_table,\"a\" \n" 156 " "STR(PTR_WD)" 1b, 5b \n" 157 " "STR(PTR_WD)" 2b, 5b \n" 158 " .previous \n" 159 " .set pop \n" 160 : [old] "=&r" (old), 161 [err] "=&r" (err), 162 [tmp] "=&r" (tmp) 163 : [addr] "r" (addr), 164 [new] "r" (new), 165 [efault] "i" (-EFAULT) 166 : "memory"); 167 } else { 168 do { 169 preempt_disable(); 170 ll_bit = 1; 171 ll_task = current; 172 preempt_enable(); 173 174 err = __get_user(old, (unsigned int *) addr); 175 err |= __put_user(new, (unsigned int *) addr); 176 if (err) 177 break; 178 rmb(); 179 } while (!ll_bit); 180 } 181 182 if (unlikely(err)) 183 return err; 184 185 regs = current_pt_regs(); 186 regs->regs[2] = old; 187 regs->regs[7] = 0; /* No error */ 188 189 /* 190 * Don't let your children do this ... 191 */ 192 __asm__ __volatile__( 193 " move $29, %0 \n" 194 " j syscall_exit \n" 195 : /* no outputs */ 196 : "r" (regs)); 197 198 /* unreached. Honestly. */ 199 unreachable(); 200} 201 202/* 203 * mips_atomic_set() normally returns directly via syscall_exit potentially 204 * clobbering static registers, so be sure to preserve them. 205 */ 206save_static_function(sys_sysmips); 207 208SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) 209{ 210 switch (cmd) { 211 case MIPS_ATOMIC_SET: 212 return mips_atomic_set(arg1, arg2); 213 214 case MIPS_FIXADE: 215 if (arg1 & ~3) 216 return -EINVAL; 217 218 if (arg1 & 1) 219 set_thread_flag(TIF_FIXADE); 220 else 221 clear_thread_flag(TIF_FIXADE); 222 if (arg1 & 2) 223 set_thread_flag(TIF_LOGADE); 224 else 225 clear_thread_flag(TIF_LOGADE); 226 227 return 0; 228 229 case FLUSH_CACHE: 230 __flush_cache_all(); 231 return 0; 232 } 233 234 return -EINVAL; 235} 236 237/* 238 * No implemented yet ... 239 */ 240SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) 241{ 242 return -ENOSYS; 243} 244