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 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 38 { 39 struct vm_unmapped_area_info info; 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 (!addr) 55 addr = TASK_UNMAPPED_BASE; 56 57 info.flags = 0; 58 info.length = len; 59 info.low_limit = addr; 60 info.high_limit = TASK_SIZE; 61 info.align_mask = (flags & MAP_SHARED) ? 62 (PAGE_MASK & (SHMLBA - 1)) : 0; 63 info.align_offset = pgoff << PAGE_SHIFT; 64 return vm_unmapped_area(&info); 65 } 66 67 /* 68 * sys_pipe() is the normal C calling standard for creating 69 * a pipe. It's not the way unix traditionally does this, though. 70 */ 71 asmlinkage int sparc_pipe(struct pt_regs *regs) 72 { 73 int fd[2]; 74 int error; 75 76 error = do_pipe_flags(fd, 0); 77 if (error) 78 goto out; 79 regs->u_regs[UREG_I1] = fd[1]; 80 error = fd[0]; 81 out: 82 return error; 83 } 84 85 int sparc_mmap_check(unsigned long addr, unsigned long len) 86 { 87 /* See asm-sparc/uaccess.h */ 88 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) 89 return -EINVAL; 90 91 return 0; 92 } 93 94 /* Linux version of mmap */ 95 96 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 97 unsigned long prot, unsigned long flags, unsigned long fd, 98 unsigned long pgoff) 99 { 100 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 101 we have. */ 102 return sys_mmap_pgoff(addr, len, prot, flags, fd, 103 pgoff >> (PAGE_SHIFT - 12)); 104 } 105 106 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 107 unsigned long prot, unsigned long flags, unsigned long fd, 108 unsigned long off) 109 { 110 /* no alignment check? */ 111 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 112 } 113 114 long sparc_remap_file_pages(unsigned long start, unsigned long size, 115 unsigned long prot, unsigned long pgoff, 116 unsigned long flags) 117 { 118 /* This works on an existing mmap so we don't need to validate 119 * the range as that was done at the original mmap call. 120 */ 121 return sys_remap_file_pages(start, size, prot, 122 (pgoff >> (PAGE_SHIFT - 12)), flags); 123 } 124 125 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 126 asmlinkage unsigned long 127 c_sys_nis_syscall (struct pt_regs *regs) 128 { 129 static int count = 0; 130 131 if (count++ > 5) 132 return -ENOSYS; 133 printk ("%s[%d]: Unimplemented SPARC system call %d\n", 134 current->comm, task_pid_nr(current), (int)regs->u_regs[1]); 135 #ifdef DEBUG_UNIMP_SYSCALL 136 show_regs (regs); 137 #endif 138 return -ENOSYS; 139 } 140 141 /* #define DEBUG_SPARC_BREAKPOINT */ 142 143 asmlinkage void 144 sparc_breakpoint (struct pt_regs *regs) 145 { 146 siginfo_t info; 147 148 #ifdef DEBUG_SPARC_BREAKPOINT 149 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); 150 #endif 151 info.si_signo = SIGTRAP; 152 info.si_errno = 0; 153 info.si_code = TRAP_BRKPT; 154 info.si_addr = (void __user *)regs->pc; 155 info.si_trapno = 0; 156 force_sig_info(SIGTRAP, &info, current); 157 158 #ifdef DEBUG_SPARC_BREAKPOINT 159 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); 160 #endif 161 } 162 163 SYSCALL_DEFINE3(sparc_sigaction, int, sig, 164 struct old_sigaction __user *,act, 165 struct old_sigaction __user *,oact) 166 { 167 WARN_ON_ONCE(sig >= 0); 168 return sys_sigaction(-sig, act, oact); 169 } 170 171 SYSCALL_DEFINE5(rt_sigaction, int, sig, 172 const struct sigaction __user *, act, 173 struct sigaction __user *, oact, 174 void __user *, restorer, 175 size_t, sigsetsize) 176 { 177 struct k_sigaction new_ka, old_ka; 178 int ret; 179 180 /* XXX: Don't preclude handling different sized sigset_t's. */ 181 if (sigsetsize != sizeof(sigset_t)) 182 return -EINVAL; 183 184 if (act) { 185 new_ka.ka_restorer = restorer; 186 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 187 return -EFAULT; 188 } 189 190 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 191 192 if (!ret && oact) { 193 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 194 return -EFAULT; 195 } 196 197 return ret; 198 } 199 200 asmlinkage int sys_getdomainname(char __user *name, int len) 201 { 202 int nlen, err; 203 204 if (len < 0) 205 return -EINVAL; 206 207 down_read(&uts_sem); 208 209 nlen = strlen(utsname()->domainname) + 1; 210 err = -EINVAL; 211 if (nlen > len) 212 goto out; 213 214 err = -EFAULT; 215 if (!copy_to_user(name, utsname()->domainname, nlen)) 216 err = 0; 217 218 out: 219 up_read(&uts_sem); 220 return err; 221 } 222