1 /* linux/arch/sparc/kernel/sys_sparc.c 2 * 3 * This file contains various random system calls that 4 * have a non-standard calling sequence on the Linux/sparc 5 * platform. 6 */ 7 8 #include <linux/errno.h> 9 #include <linux/types.h> 10 #include <linux/sched.h> 11 #include <linux/mm.h> 12 #include <linux/fs.h> 13 #include <linux/file.h> 14 #include <linux/sem.h> 15 #include <linux/msg.h> 16 #include <linux/shm.h> 17 #include <linux/stat.h> 18 #include <linux/syscalls.h> 19 #include <linux/mman.h> 20 #include <linux/utsname.h> 21 #include <linux/smp.h> 22 #include <linux/smp_lock.h> 23 #include <linux/ipc.h> 24 25 #include <asm/uaccess.h> 26 #include <asm/unistd.h> 27 28 /* #define DEBUG_UNIMP_SYSCALL */ 29 30 /* XXX Make this per-binary type, this way we can detect the type of 31 * XXX a binary. Every Sparc executable calls this very early on. 32 */ 33 asmlinkage unsigned long sys_getpagesize(void) 34 { 35 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ 36 } 37 38 #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1)) 39 40 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 41 { 42 struct vm_area_struct * vmm; 43 44 if (flags & MAP_FIXED) { 45 /* We do not accept a shared mapping if it would violate 46 * cache aliasing constraints. 47 */ 48 if ((flags & MAP_SHARED) && 49 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 50 return -EINVAL; 51 return addr; 52 } 53 54 /* See asm-sparc/uaccess.h */ 55 if (len > TASK_SIZE - PAGE_SIZE) 56 return -ENOMEM; 57 if (ARCH_SUN4C && len > 0x20000000) 58 return -ENOMEM; 59 if (!addr) 60 addr = TASK_UNMAPPED_BASE; 61 62 if (flags & MAP_SHARED) 63 addr = COLOUR_ALIGN(addr); 64 else 65 addr = PAGE_ALIGN(addr); 66 67 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 68 /* At this point: (!vmm || addr < vmm->vm_end). */ 69 if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) { 70 addr = PAGE_OFFSET; 71 vmm = find_vma(current->mm, PAGE_OFFSET); 72 } 73 if (TASK_SIZE - PAGE_SIZE - len < addr) 74 return -ENOMEM; 75 if (!vmm || addr + len <= vmm->vm_start) 76 return addr; 77 addr = vmm->vm_end; 78 if (flags & MAP_SHARED) 79 addr = COLOUR_ALIGN(addr); 80 } 81 } 82 83 /* 84 * sys_pipe() is the normal C calling standard for creating 85 * a pipe. It's not the way unix traditionally does this, though. 86 */ 87 asmlinkage int sparc_pipe(struct pt_regs *regs) 88 { 89 int fd[2]; 90 int error; 91 92 error = do_pipe_flags(fd, 0); 93 if (error) 94 goto out; 95 regs->u_regs[UREG_I1] = fd[1]; 96 error = fd[0]; 97 out: 98 return error; 99 } 100 101 int sparc_mmap_check(unsigned long addr, unsigned long len) 102 { 103 if (ARCH_SUN4C && 104 (len > 0x20000000 || 105 (addr < 0xe0000000 && addr + len > 0x20000000))) 106 return -EINVAL; 107 108 /* See asm-sparc/uaccess.h */ 109 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) 110 return -EINVAL; 111 112 return 0; 113 } 114 115 /* Linux version of mmap */ 116 117 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 118 unsigned long prot, unsigned long flags, unsigned long fd, 119 unsigned long pgoff) 120 { 121 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 122 we have. */ 123 return sys_mmap_pgoff(addr, len, prot, flags, fd, 124 pgoff >> (PAGE_SHIFT - 12)); 125 } 126 127 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 128 unsigned long prot, unsigned long flags, unsigned long fd, 129 unsigned long off) 130 { 131 /* no alignment check? */ 132 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 133 } 134 135 long sparc_remap_file_pages(unsigned long start, unsigned long size, 136 unsigned long prot, unsigned long pgoff, 137 unsigned long flags) 138 { 139 /* This works on an existing mmap so we don't need to validate 140 * the range as that was done at the original mmap call. 141 */ 142 return sys_remap_file_pages(start, size, prot, 143 (pgoff >> (PAGE_SHIFT - 12)), flags); 144 } 145 146 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 147 asmlinkage unsigned long 148 c_sys_nis_syscall (struct pt_regs *regs) 149 { 150 static int count = 0; 151 152 if (count++ > 5) 153 return -ENOSYS; 154 printk ("%s[%d]: Unimplemented SPARC system call %d\n", 155 current->comm, task_pid_nr(current), (int)regs->u_regs[1]); 156 #ifdef DEBUG_UNIMP_SYSCALL 157 show_regs (regs); 158 #endif 159 return -ENOSYS; 160 } 161 162 /* #define DEBUG_SPARC_BREAKPOINT */ 163 164 asmlinkage void 165 sparc_breakpoint (struct pt_regs *regs) 166 { 167 siginfo_t info; 168 169 #ifdef DEBUG_SPARC_BREAKPOINT 170 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); 171 #endif 172 info.si_signo = SIGTRAP; 173 info.si_errno = 0; 174 info.si_code = TRAP_BRKPT; 175 info.si_addr = (void __user *)regs->pc; 176 info.si_trapno = 0; 177 force_sig_info(SIGTRAP, &info, current); 178 179 #ifdef DEBUG_SPARC_BREAKPOINT 180 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); 181 #endif 182 } 183 184 asmlinkage int 185 sparc_sigaction (int sig, const struct old_sigaction __user *act, 186 struct old_sigaction __user *oact) 187 { 188 struct k_sigaction new_ka, old_ka; 189 int ret; 190 191 WARN_ON_ONCE(sig >= 0); 192 sig = -sig; 193 194 if (act) { 195 unsigned long mask; 196 197 if (!access_ok(VERIFY_READ, act, sizeof(*act)) || 198 __get_user(new_ka.sa.sa_handler, &act->sa_handler) || 199 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) 200 return -EFAULT; 201 __get_user(new_ka.sa.sa_flags, &act->sa_flags); 202 __get_user(mask, &act->sa_mask); 203 siginitset(&new_ka.sa.sa_mask, mask); 204 new_ka.ka_restorer = NULL; 205 } 206 207 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 208 209 if (!ret && oact) { 210 /* In the clone() case we could copy half consistent 211 * state to the user, however this could sleep and 212 * deadlock us if we held the signal lock on SMP. So for 213 * now I take the easy way out and do no locking. 214 */ 215 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || 216 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || 217 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) 218 return -EFAULT; 219 __put_user(old_ka.sa.sa_flags, &oact->sa_flags); 220 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); 221 } 222 223 return ret; 224 } 225 226 asmlinkage long 227 sys_rt_sigaction(int sig, 228 const struct sigaction __user *act, 229 struct sigaction __user *oact, 230 void __user *restorer, 231 size_t sigsetsize) 232 { 233 struct k_sigaction new_ka, old_ka; 234 int ret; 235 236 /* XXX: Don't preclude handling different sized sigset_t's. */ 237 if (sigsetsize != sizeof(sigset_t)) 238 return -EINVAL; 239 240 if (act) { 241 new_ka.ka_restorer = restorer; 242 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 243 return -EFAULT; 244 } 245 246 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 247 248 if (!ret && oact) { 249 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 250 return -EFAULT; 251 } 252 253 return ret; 254 } 255 256 asmlinkage int sys_getdomainname(char __user *name, int len) 257 { 258 int nlen, err; 259 260 if (len < 0) 261 return -EINVAL; 262 263 down_read(&uts_sem); 264 265 nlen = strlen(utsname()->domainname) + 1; 266 err = -EINVAL; 267 if (nlen > len) 268 goto out; 269 270 err = -EFAULT; 271 if (!copy_to_user(name, utsname()->domainname, nlen)) 272 err = 0; 273 274 out: 275 up_read(&uts_sem); 276 return err; 277 } 278 279 /* 280 * Do a system call from kernel instead of calling sys_execve so we 281 * end up with proper pt_regs. 282 */ 283 int kernel_execve(const char *filename, 284 const char *const argv[], 285 const char *const envp[]) 286 { 287 long __res; 288 register long __g1 __asm__ ("g1") = __NR_execve; 289 register long __o0 __asm__ ("o0") = (long)(filename); 290 register long __o1 __asm__ ("o1") = (long)(argv); 291 register long __o2 __asm__ ("o2") = (long)(envp); 292 asm volatile ("t 0x10\n\t" 293 "bcc 1f\n\t" 294 "mov %%o0, %0\n\t" 295 "sub %%g0, %%o0, %0\n\t" 296 "1:\n\t" 297 : "=r" (__res), "=&r" (__o0) 298 : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) 299 : "cc"); 300 return __res; 301 } 302