| 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 mips3 \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 | " .section .fixup,\"ax\" \n" |
| 121 | "4: li %[err], %[efault] \n" |
| 122 | " j 3b \n" |
| 123 | " .previous \n" |
| 124 | " .section __ex_table,\"a\" \n" |
| 125 | " "STR(PTR)" 1b, 4b \n" |
| 126 | " "STR(PTR)" 2b, 4b \n" |
| 127 | " .previous \n" |
| 128 | " .set mips0 \n" |
| 129 | : [old] "=&r" (old), |
| 130 | [err] "=&r" (err), |
| 131 | [tmp] "=&r" (tmp) |
| 132 | : [addr] "r" (addr), |
| 133 | [new] "r" (new), |
| 134 | [efault] "i" (-EFAULT) |
| 135 | : "memory"); |
| 136 | } else if (cpu_has_llsc) { |
| 137 | __asm__ __volatile__ ( |
| 138 | " .set mips3 \n" |
| 139 | " li %[err], 0 \n" |
| 140 | "1: ll %[old], (%[addr]) \n" |
| 141 | " move %[tmp], %[new] \n" |
| 142 | "2: sc %[tmp], (%[addr]) \n" |
| 143 | " beqz %[tmp], 4f \n" |
| 144 | "3: \n" |
| 145 | " .subsection 2 \n" |
| 146 | "4: b 1b \n" |
| 147 | " .previous \n" |
| 148 | " \n" |
| 149 | " .section .fixup,\"ax\" \n" |
| 150 | "5: li %[err], %[efault] \n" |
| 151 | " j 3b \n" |
| 152 | " .previous \n" |
| 153 | " .section __ex_table,\"a\" \n" |
| 154 | " "STR(PTR)" 1b, 5b \n" |
| 155 | " "STR(PTR)" 2b, 5b \n" |
| 156 | " .previous \n" |
| 157 | " .set mips0 \n" |
| 158 | : [old] "=&r" (old), |
| 159 | [err] "=&r" (err), |
| 160 | [tmp] "=&r" (tmp) |
| 161 | : [addr] "r" (addr), |
| 162 | [new] "r" (new), |
| 163 | [efault] "i" (-EFAULT) |
| 164 | : "memory"); |
| 165 | } else { |
| 166 | do { |
| 167 | preempt_disable(); |
| 168 | ll_bit = 1; |
| 169 | ll_task = current; |
| 170 | preempt_enable(); |
| 171 | |
| 172 | err = __get_user(old, (unsigned int *) addr); |
| 173 | err |= __put_user(new, (unsigned int *) addr); |
| 174 | if (err) |
| 175 | break; |
| 176 | rmb(); |
| 177 | } while (!ll_bit); |
| 178 | } |
| 179 | |
| 180 | if (unlikely(err)) |
| 181 | return err; |
| 182 | |
| 183 | regs = current_pt_regs(); |
| 184 | regs->regs[2] = old; |
| 185 | regs->regs[7] = 0; /* No error */ |
| 186 | |
| 187 | /* |
| 188 | * Don't let your children do this ... |
| 189 | */ |
| 190 | __asm__ __volatile__( |
| 191 | " move $29, %0 \n" |
| 192 | " j syscall_exit \n" |
| 193 | : /* no outputs */ |
| 194 | : "r" (regs)); |
| 195 | |
| 196 | /* unreached. Honestly. */ |
| 197 | unreachable(); |
| 198 | } |
| 199 | |
| 200 | SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) |
| 201 | { |
| 202 | switch (cmd) { |
| 203 | case MIPS_ATOMIC_SET: |
| 204 | return mips_atomic_set(arg1, arg2); |
| 205 | |
| 206 | case MIPS_FIXADE: |
| 207 | if (arg1 & ~3) |
| 208 | return -EINVAL; |
| 209 | |
| 210 | if (arg1 & 1) |
| 211 | set_thread_flag(TIF_FIXADE); |
| 212 | else |
| 213 | clear_thread_flag(TIF_FIXADE); |
| 214 | if (arg1 & 2) |
| 215 | set_thread_flag(TIF_LOGADE); |
| 216 | else |
| 217 | clear_thread_flag(TIF_LOGADE); |
| 218 | |
| 219 | return 0; |
| 220 | |
| 221 | case FLUSH_CACHE: |
| 222 | __flush_cache_all(); |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | return -EINVAL; |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * No implemented yet ... |
| 231 | */ |
| 232 | SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) |
| 233 | { |
| 234 | return -ENOSYS; |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * If we ever come here the user sp is bad. Zap the process right away. |
| 239 | * Due to the bad stack signaling wouldn't work. |
| 240 | */ |
| 241 | asmlinkage void bad_stack(void) |
| 242 | { |
| 243 | do_exit(SIGSEGV); |
| 244 | } |