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 30 #include <asm/asm.h> 31 #include <asm/branch.h> 32 #include <asm/cachectl.h> 33 #include <asm/cacheflush.h> 34 #include <asm/asm-offsets.h> 35 #include <asm/signal.h> 36 #include <asm/sim.h> 37 #include <asm/shmparam.h> 38 #include <asm/sysmips.h> 39 #include <asm/uaccess.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 unsigned long result; 64 65 result = -EINVAL; 66 if (offset & ~PAGE_MASK) 67 goto out; 68 69 result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 70 71 out: 72 return result; 73 } 74 75 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, 76 unsigned long, prot, unsigned long, flags, unsigned long, fd, 77 unsigned long, pgoff) 78 { 79 if (pgoff & (~PAGE_MASK >> 12)) 80 return -EINVAL; 81 82 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); 83 } 84 85 save_static_function(sys_fork); 86 save_static_function(sys_clone); 87 88 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) 89 { 90 struct thread_info *ti = task_thread_info(current); 91 92 ti->tp_value = addr; 93 if (cpu_has_userlocal) 94 write_c0_userlocal(addr); 95 96 return 0; 97 } 98 99 static inline int mips_atomic_set(unsigned long addr, unsigned long new) 100 { 101 unsigned long old, tmp; 102 struct pt_regs *regs; 103 unsigned int err; 104 105 if (unlikely(addr & 3)) 106 return -EINVAL; 107 108 if (unlikely(!access_ok(VERIFY_WRITE, addr, 4))) 109 return -EINVAL; 110 111 if (cpu_has_llsc && R10000_LLSC_WAR) { 112 __asm__ __volatile__ ( 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)" 1b, 4b \n" 127 " "STR(PTR)" 2b, 4b \n" 128 " .previous \n" 129 " .set mips0 \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 "MIPS_ISA_ARCH_LEVEL" \n" 140 " li %[err], 0 \n" 141 "1: ll %[old], (%[addr]) \n" 142 " move %[tmp], %[new] \n" 143 "2: sc %[tmp], (%[addr]) \n" 144 " bnez %[tmp], 4f \n" 145 "3: \n" 146 " .insn \n" 147 " .subsection 2 \n" 148 "4: b 1b \n" 149 " .previous \n" 150 " \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)" 1b, 5b \n" 157 " "STR(PTR)" 2b, 5b \n" 158 " .previous \n" 159 " .set mips0 \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 SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) 203 { 204 switch (cmd) { 205 case MIPS_ATOMIC_SET: 206 return mips_atomic_set(arg1, arg2); 207 208 case MIPS_FIXADE: 209 if (arg1 & ~3) 210 return -EINVAL; 211 212 if (arg1 & 1) 213 set_thread_flag(TIF_FIXADE); 214 else 215 clear_thread_flag(TIF_FIXADE); 216 if (arg1 & 2) 217 set_thread_flag(TIF_LOGADE); 218 else 219 clear_thread_flag(TIF_LOGADE); 220 221 return 0; 222 223 case FLUSH_CACHE: 224 __flush_cache_all(); 225 return 0; 226 } 227 228 return -EINVAL; 229 } 230 231 /* 232 * No implemented yet ... 233 */ 234 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) 235 { 236 return -ENOSYS; 237 } 238 239 /* 240 * If we ever come here the user sp is bad. Zap the process right away. 241 * Due to the bad stack signaling wouldn't work. 242 */ 243 asmlinkage void bad_stack(void) 244 { 245 do_exit(SIGSEGV); 246 } 247