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 #include "systbls.h" 28 29 /* #define DEBUG_UNIMP_SYSCALL */ 30 31 /* XXX Make this per-binary type, this way we can detect the type of 32 * XXX a binary. Every Sparc executable calls this very early on. 33 */ 34 asmlinkage unsigned long sys_getpagesize(void) 35 { 36 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ 37 } 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_unmapped_area_info info; 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 (!addr) 57 addr = TASK_UNMAPPED_BASE; 58 59 info.flags = 0; 60 info.length = len; 61 info.low_limit = addr; 62 info.high_limit = TASK_SIZE; 63 info.align_mask = (flags & MAP_SHARED) ? 64 (PAGE_MASK & (SHMLBA - 1)) : 0; 65 info.align_offset = pgoff << PAGE_SHIFT; 66 return vm_unmapped_area(&info); 67 } 68 69 /* 70 * sys_pipe() is the normal C calling standard for creating 71 * a pipe. It's not the way unix traditionally does this, though. 72 */ 73 asmlinkage long sparc_pipe(struct pt_regs *regs) 74 { 75 int fd[2]; 76 int error; 77 78 error = do_pipe_flags(fd, 0); 79 if (error) 80 goto out; 81 regs->u_regs[UREG_I1] = fd[1]; 82 error = fd[0]; 83 out: 84 return error; 85 } 86 87 int sparc_mmap_check(unsigned long addr, unsigned long len) 88 { 89 /* See asm-sparc/uaccess.h */ 90 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) 91 return -EINVAL; 92 93 return 0; 94 } 95 96 /* Linux version of mmap */ 97 98 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, 99 unsigned long prot, unsigned long flags, unsigned long fd, 100 unsigned long pgoff) 101 { 102 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 103 we have. */ 104 return sys_mmap_pgoff(addr, len, prot, flags, fd, 105 pgoff >> (PAGE_SHIFT - 12)); 106 } 107 108 asmlinkage long sys_mmap(unsigned long addr, unsigned long len, 109 unsigned long prot, unsigned long flags, unsigned long fd, 110 unsigned long off) 111 { 112 /* no alignment check? */ 113 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 114 } 115 116 long sparc_remap_file_pages(unsigned long start, unsigned long size, 117 unsigned long prot, unsigned long pgoff, 118 unsigned long flags) 119 { 120 /* This works on an existing mmap so we don't need to validate 121 * the range as that was done at the original mmap call. 122 */ 123 return sys_remap_file_pages(start, size, prot, 124 (pgoff >> (PAGE_SHIFT - 12)), flags); 125 } 126 127 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 128 asmlinkage unsigned long 129 c_sys_nis_syscall (struct pt_regs *regs) 130 { 131 static int count = 0; 132 133 if (count++ > 5) 134 return -ENOSYS; 135 printk ("%s[%d]: Unimplemented SPARC system call %d\n", 136 current->comm, task_pid_nr(current), (int)regs->u_regs[1]); 137 #ifdef DEBUG_UNIMP_SYSCALL 138 show_regs (regs); 139 #endif 140 return -ENOSYS; 141 } 142 143 /* #define DEBUG_SPARC_BREAKPOINT */ 144 145 asmlinkage void 146 sparc_breakpoint (struct pt_regs *regs) 147 { 148 siginfo_t info; 149 150 #ifdef DEBUG_SPARC_BREAKPOINT 151 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); 152 #endif 153 info.si_signo = SIGTRAP; 154 info.si_errno = 0; 155 info.si_code = TRAP_BRKPT; 156 info.si_addr = (void __user *)regs->pc; 157 info.si_trapno = 0; 158 force_sig_info(SIGTRAP, &info, current); 159 160 #ifdef DEBUG_SPARC_BREAKPOINT 161 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); 162 #endif 163 } 164 165 SYSCALL_DEFINE3(sparc_sigaction, int, sig, 166 struct old_sigaction __user *,act, 167 struct old_sigaction __user *,oact) 168 { 169 WARN_ON_ONCE(sig >= 0); 170 return sys_sigaction(-sig, act, oact); 171 } 172 173 SYSCALL_DEFINE5(rt_sigaction, int, sig, 174 const struct sigaction __user *, act, 175 struct sigaction __user *, oact, 176 void __user *, restorer, 177 size_t, sigsetsize) 178 { 179 struct k_sigaction new_ka, old_ka; 180 int ret; 181 182 /* XXX: Don't preclude handling different sized sigset_t's. */ 183 if (sigsetsize != sizeof(sigset_t)) 184 return -EINVAL; 185 186 if (act) { 187 new_ka.ka_restorer = restorer; 188 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 189 return -EFAULT; 190 } 191 192 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 193 194 if (!ret && oact) { 195 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 196 return -EFAULT; 197 } 198 199 return ret; 200 } 201 202 asmlinkage long sys_getdomainname(char __user *name, int len) 203 { 204 int nlen, err; 205 206 if (len < 0) 207 return -EINVAL; 208 209 down_read(&uts_sem); 210 211 nlen = strlen(utsname()->domainname) + 1; 212 err = -EINVAL; 213 if (nlen > len) 214 goto out; 215 216 err = -EFAULT; 217 if (!copy_to_user(name, utsname()->domainname, nlen)) 218 err = 0; 219 220 out: 221 up_read(&uts_sem); 222 return err; 223 } 224