1 /* 2 * Implementation of various system calls for Linux/PowerPC 3 * 4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 5 * 6 * Derived from "arch/i386/kernel/sys_i386.c" 7 * Adapted from the i386 version by Gary Thomas 8 * Modified by Cort Dougan (cort@cs.nmt.edu) 9 * and Paul Mackerras (paulus@cs.anu.edu.au). 10 * 11 * This file contains various random system calls that 12 * have a non-standard calling sequence on the Linux/PPC 13 * platform. 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 * 20 */ 21 22 #include <linux/errno.h> 23 #include <linux/sched.h> 24 #include <linux/syscalls.h> 25 #include <linux/mm.h> 26 #include <linux/fs.h> 27 #include <linux/smp.h> 28 #include <linux/sem.h> 29 #include <linux/msg.h> 30 #include <linux/shm.h> 31 #include <linux/stat.h> 32 #include <linux/mman.h> 33 #include <linux/sys.h> 34 #include <linux/ipc.h> 35 #include <linux/utsname.h> 36 #include <linux/file.h> 37 #include <linux/init.h> 38 #include <linux/personality.h> 39 40 #include <asm/uaccess.h> 41 #include <asm/syscalls.h> 42 #include <asm/time.h> 43 #include <asm/unistd.h> 44 45 /* 46 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 47 * 48 * This is really horribly ugly. 49 */ 50 int sys_ipc(uint call, int first, unsigned long second, long third, 51 void __user *ptr, long fifth) 52 { 53 int version, ret; 54 55 version = call >> 16; /* hack for backward compatibility */ 56 call &= 0xffff; 57 58 ret = -ENOSYS; 59 switch (call) { 60 case SEMOP: 61 ret = sys_semtimedop(first, (struct sembuf __user *)ptr, 62 (unsigned)second, NULL); 63 break; 64 case SEMTIMEDOP: 65 ret = sys_semtimedop(first, (struct sembuf __user *)ptr, 66 (unsigned)second, 67 (const struct timespec __user *) fifth); 68 break; 69 case SEMGET: 70 ret = sys_semget (first, (int)second, third); 71 break; 72 case SEMCTL: { 73 union semun fourth; 74 75 ret = -EINVAL; 76 if (!ptr) 77 break; 78 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr))) 79 break; 80 ret = sys_semctl(first, (int)second, third, fourth); 81 break; 82 } 83 case MSGSND: 84 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr, 85 (size_t)second, third); 86 break; 87 case MSGRCV: 88 switch (version) { 89 case 0: { 90 struct ipc_kludge tmp; 91 92 ret = -EINVAL; 93 if (!ptr) 94 break; 95 if ((ret = copy_from_user(&tmp, 96 (struct ipc_kludge __user *) ptr, 97 sizeof (tmp)) ? -EFAULT : 0)) 98 break; 99 ret = sys_msgrcv(first, tmp.msgp, (size_t) second, 100 tmp.msgtyp, third); 101 break; 102 } 103 default: 104 ret = sys_msgrcv (first, (struct msgbuf __user *) ptr, 105 (size_t)second, fifth, third); 106 break; 107 } 108 break; 109 case MSGGET: 110 ret = sys_msgget((key_t)first, (int)second); 111 break; 112 case MSGCTL: 113 ret = sys_msgctl(first, (int)second, 114 (struct msqid_ds __user *)ptr); 115 break; 116 case SHMAT: { 117 ulong raddr; 118 ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr); 119 if (ret) 120 break; 121 ret = put_user(raddr, (ulong __user *) third); 122 break; 123 } 124 case SHMDT: 125 ret = sys_shmdt((char __user *)ptr); 126 break; 127 case SHMGET: 128 ret = sys_shmget(first, (size_t)second, third); 129 break; 130 case SHMCTL: 131 ret = sys_shmctl(first, (int)second, 132 (struct shmid_ds __user *)ptr); 133 break; 134 } 135 136 return ret; 137 } 138 139 static inline unsigned long do_mmap2(unsigned long addr, size_t len, 140 unsigned long prot, unsigned long flags, 141 unsigned long fd, unsigned long off, int shift) 142 { 143 unsigned long ret = -EINVAL; 144 145 if (!arch_validate_prot(prot)) 146 goto out; 147 148 if (shift) { 149 if (off & ((1 << shift) - 1)) 150 goto out; 151 off >>= shift; 152 } 153 154 ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off); 155 out: 156 return ret; 157 } 158 159 unsigned long sys_mmap2(unsigned long addr, size_t len, 160 unsigned long prot, unsigned long flags, 161 unsigned long fd, unsigned long pgoff) 162 { 163 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 164 } 165 166 unsigned long sys_mmap(unsigned long addr, size_t len, 167 unsigned long prot, unsigned long flags, 168 unsigned long fd, off_t offset) 169 { 170 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 171 } 172 173 #ifdef CONFIG_PPC32 174 /* 175 * Due to some executables calling the wrong select we sometimes 176 * get wrong args. This determines how the args are being passed 177 * (a single ptr to them all args passed) then calls 178 * sys_select() with the appropriate args. -- Cort 179 */ 180 int 181 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp) 182 { 183 if ( (unsigned long)n >= 4096 ) 184 { 185 unsigned long __user *buffer = (unsigned long __user *)n; 186 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long)) 187 || __get_user(n, buffer) 188 || __get_user(inp, ((fd_set __user * __user *)(buffer+1))) 189 || __get_user(outp, ((fd_set __user * __user *)(buffer+2))) 190 || __get_user(exp, ((fd_set __user * __user *)(buffer+3))) 191 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4)))) 192 return -EFAULT; 193 } 194 return sys_select(n, inp, outp, exp, tvp); 195 } 196 #endif 197 198 #ifdef CONFIG_PPC64 199 long ppc64_personality(unsigned long personality) 200 { 201 long ret; 202 203 if (personality(current->personality) == PER_LINUX32 204 && personality == PER_LINUX) 205 personality = PER_LINUX32; 206 ret = sys_personality(personality); 207 if (ret == PER_LINUX32) 208 ret = PER_LINUX; 209 return ret; 210 } 211 #endif 212 213 #ifdef CONFIG_PPC64 214 #define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32) 215 #else 216 #define OVERRIDE_MACHINE 0 217 #endif 218 219 static inline int override_machine(char __user *mach) 220 { 221 if (OVERRIDE_MACHINE) { 222 /* change ppc64 to ppc */ 223 if (__put_user(0, mach+3) || __put_user(0, mach+4)) 224 return -EFAULT; 225 } 226 return 0; 227 } 228 229 long ppc_newuname(struct new_utsname __user * name) 230 { 231 int err = 0; 232 233 down_read(&uts_sem); 234 if (copy_to_user(name, utsname(), sizeof(*name))) 235 err = -EFAULT; 236 up_read(&uts_sem); 237 if (!err) 238 err = override_machine(name->machine); 239 return err; 240 } 241 242 int sys_uname(struct old_utsname __user *name) 243 { 244 int err = 0; 245 246 down_read(&uts_sem); 247 if (copy_to_user(name, utsname(), sizeof(*name))) 248 err = -EFAULT; 249 up_read(&uts_sem); 250 if (!err) 251 err = override_machine(name->machine); 252 return err; 253 } 254 255 int sys_olduname(struct oldold_utsname __user *name) 256 { 257 int error; 258 259 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) 260 return -EFAULT; 261 262 down_read(&uts_sem); 263 error = __copy_to_user(&name->sysname, &utsname()->sysname, 264 __OLD_UTS_LEN); 265 error |= __put_user(0, name->sysname + __OLD_UTS_LEN); 266 error |= __copy_to_user(&name->nodename, &utsname()->nodename, 267 __OLD_UTS_LEN); 268 error |= __put_user(0, name->nodename + __OLD_UTS_LEN); 269 error |= __copy_to_user(&name->release, &utsname()->release, 270 __OLD_UTS_LEN); 271 error |= __put_user(0, name->release + __OLD_UTS_LEN); 272 error |= __copy_to_user(&name->version, &utsname()->version, 273 __OLD_UTS_LEN); 274 error |= __put_user(0, name->version + __OLD_UTS_LEN); 275 error |= __copy_to_user(&name->machine, &utsname()->machine, 276 __OLD_UTS_LEN); 277 error |= override_machine(name->machine); 278 up_read(&uts_sem); 279 280 return error? -EFAULT: 0; 281 } 282 283 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 284 u32 len_high, u32 len_low) 285 { 286 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, 287 (u64)len_high << 32 | len_low, advice); 288 } 289 290 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5, 291 unsigned long r6, unsigned long r7, unsigned long r8, 292 struct pt_regs *regs) 293 { 294 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p" 295 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs, 296 current, smp_processor_id()); 297 } 298 299 void do_show_syscall_exit(unsigned long r3) 300 { 301 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id()); 302 } 303