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/branch.h> 33 #include <asm/cachectl.h> 34 #include <asm/cacheflush.h> 35 #include <asm/asm-offsets.h> 36 #include <asm/signal.h> 37 #include <asm/sim.h> 38 #include <asm/shmparam.h> 39 #include <asm/sysmips.h> 40 #include <asm/switch_to.h> 41 42 /* 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. 48 */ 49 asmlinkage int sysm_pipe(void) 50 { 51 int fd[2]; 52 int error = do_pipe_flags(fd, 0); 53 if (error) 54 return error; 55 current_pt_regs()->regs[3] = fd[1]; 56 return fd[0]; 57 } 58 59 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, 60 unsigned long, prot, unsigned long, flags, unsigned long, 61 fd, off_t, offset) 62 { 63 if (offset & ~PAGE_MASK) 64 return -EINVAL; 65 return sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 66 } 67 68 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, 69 unsigned long, prot, unsigned long, flags, unsigned long, fd, 70 unsigned long, pgoff) 71 { 72 if (pgoff & (~PAGE_MASK >> 12)) 73 return -EINVAL; 74 75 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); 76 } 77 78 save_static_function(sys_fork); 79 save_static_function(sys_clone); 80 81 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) 82 { 83 struct thread_info *ti = task_thread_info(current); 84 85 ti->tp_value = addr; 86 if (cpu_has_userlocal) 87 write_c0_userlocal(addr); 88 89 return 0; 90 } 91 92 static inline int mips_atomic_set(unsigned long addr, unsigned long new) 93 { 94 unsigned long old, tmp; 95 struct pt_regs *regs; 96 unsigned int err; 97 98 if (unlikely(addr & 3)) 99 return -EINVAL; 100 101 if (unlikely(!access_ok(VERIFY_WRITE, (const void __user *)addr, 4))) 102 return -EINVAL; 103 104 if (cpu_has_llsc && R10000_LLSC_WAR) { 105 __asm__ __volatile__ ( 106 " .set arch=r4000 \n" 107 " li %[err], 0 \n" 108 "1: ll %[old], (%[addr]) \n" 109 " move %[tmp], %[new] \n" 110 "2: sc %[tmp], (%[addr]) \n" 111 " beqzl %[tmp], 1b \n" 112 "3: \n" 113 " .insn \n" 114 " .section .fixup,\"ax\" \n" 115 "4: li %[err], %[efault] \n" 116 " j 3b \n" 117 " .previous \n" 118 " .section __ex_table,\"a\" \n" 119 " "STR(PTR)" 1b, 4b \n" 120 " "STR(PTR)" 2b, 4b \n" 121 " .previous \n" 122 " .set mips0 \n" 123 : [old] "=&r" (old), 124 [err] "=&r" (err), 125 [tmp] "=&r" (tmp) 126 : [addr] "r" (addr), 127 [new] "r" (new), 128 [efault] "i" (-EFAULT) 129 : "memory"); 130 } else if (cpu_has_llsc) { 131 __asm__ __volatile__ ( 132 " .set "MIPS_ISA_ARCH_LEVEL" \n" 133 " li %[err], 0 \n" 134 "1: ll %[old], (%[addr]) \n" 135 " move %[tmp], %[new] \n" 136 "2: sc %[tmp], (%[addr]) \n" 137 " bnez %[tmp], 4f \n" 138 "3: \n" 139 " .insn \n" 140 " .subsection 2 \n" 141 "4: b 1b \n" 142 " .previous \n" 143 " \n" 144 " .section .fixup,\"ax\" \n" 145 "5: li %[err], %[efault] \n" 146 " j 3b \n" 147 " .previous \n" 148 " .section __ex_table,\"a\" \n" 149 " "STR(PTR)" 1b, 5b \n" 150 " "STR(PTR)" 2b, 5b \n" 151 " .previous \n" 152 " .set mips0 \n" 153 : [old] "=&r" (old), 154 [err] "=&r" (err), 155 [tmp] "=&r" (tmp) 156 : [addr] "r" (addr), 157 [new] "r" (new), 158 [efault] "i" (-EFAULT) 159 : "memory"); 160 } else { 161 do { 162 preempt_disable(); 163 ll_bit = 1; 164 ll_task = current; 165 preempt_enable(); 166 167 err = __get_user(old, (unsigned int *) addr); 168 err |= __put_user(new, (unsigned int *) addr); 169 if (err) 170 break; 171 rmb(); 172 } while (!ll_bit); 173 } 174 175 if (unlikely(err)) 176 return err; 177 178 regs = current_pt_regs(); 179 regs->regs[2] = old; 180 regs->regs[7] = 0; /* No error */ 181 182 /* 183 * Don't let your children do this ... 184 */ 185 __asm__ __volatile__( 186 " move $29, %0 \n" 187 " j syscall_exit \n" 188 : /* no outputs */ 189 : "r" (regs)); 190 191 /* unreached. Honestly. */ 192 unreachable(); 193 } 194 195 SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) 196 { 197 switch (cmd) { 198 case MIPS_ATOMIC_SET: 199 return mips_atomic_set(arg1, arg2); 200 201 case MIPS_FIXADE: 202 if (arg1 & ~3) 203 return -EINVAL; 204 205 if (arg1 & 1) 206 set_thread_flag(TIF_FIXADE); 207 else 208 clear_thread_flag(TIF_FIXADE); 209 if (arg1 & 2) 210 set_thread_flag(TIF_LOGADE); 211 else 212 clear_thread_flag(TIF_LOGADE); 213 214 return 0; 215 216 case FLUSH_CACHE: 217 __flush_cache_all(); 218 return 0; 219 } 220 221 return -EINVAL; 222 } 223 224 /* 225 * No implemented yet ... 226 */ 227 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) 228 { 229 return -ENOSYS; 230 } 231 232 /* 233 * If we ever come here the user sp is bad. Zap the process right away. 234 * Due to the bad stack signaling wouldn't work. 235 */ 236 asmlinkage void bad_stack(void) 237 { 238 do_exit(SIGSEGV); 239 } 240