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