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