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/signal.h> 11 #include <linux/sched/mm.h> 12 #include <linux/sched/debug.h> 13 #include <linux/mm.h> 14 #include <linux/fs.h> 15 #include <linux/file.h> 16 #include <linux/sem.h> 17 #include <linux/msg.h> 18 #include <linux/shm.h> 19 #include <linux/stat.h> 20 #include <linux/syscalls.h> 21 #include <linux/mman.h> 22 #include <linux/utsname.h> 23 #include <linux/smp.h> 24 #include <linux/ipc.h> 25 26 #include <linux/uaccess.h> 27 #include <asm/unistd.h> 28 29 #include "systbls.h" 30 31 /* #define DEBUG_UNIMP_SYSCALL */ 32 33 /* XXX Make this per-binary type, this way we can detect the type of 34 * XXX a binary. Every Sparc executable calls this very early on. 35 */ 36 asmlinkage unsigned long sys_getpagesize(void) 37 { 38 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ 39 } 40 41 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 42 { 43 struct vm_unmapped_area_info info; 44 45 if (flags & MAP_FIXED) { 46 /* We do not accept a shared mapping if it would violate 47 * cache aliasing constraints. 48 */ 49 if ((flags & MAP_SHARED) && 50 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 51 return -EINVAL; 52 return addr; 53 } 54 55 /* See asm-sparc/uaccess.h */ 56 if (len > TASK_SIZE - PAGE_SIZE) 57 return -ENOMEM; 58 if (!addr) 59 addr = TASK_UNMAPPED_BASE; 60 61 info.flags = 0; 62 info.length = len; 63 info.low_limit = addr; 64 info.high_limit = TASK_SIZE; 65 info.align_mask = (flags & MAP_SHARED) ? 66 (PAGE_MASK & (SHMLBA - 1)) : 0; 67 info.align_offset = pgoff << PAGE_SHIFT; 68 return vm_unmapped_area(&info); 69 } 70 71 /* 72 * sys_pipe() is the normal C calling standard for creating 73 * a pipe. It's not the way unix traditionally does this, though. 74 */ 75 asmlinkage long sparc_pipe(struct pt_regs *regs) 76 { 77 int fd[2]; 78 int error; 79 80 error = do_pipe_flags(fd, 0); 81 if (error) 82 goto out; 83 regs->u_regs[UREG_I1] = fd[1]; 84 error = fd[0]; 85 out: 86 return error; 87 } 88 89 int sparc_mmap_check(unsigned long addr, unsigned long len) 90 { 91 /* See asm-sparc/uaccess.h */ 92 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) 93 return -EINVAL; 94 95 return 0; 96 } 97 98 /* Linux version of mmap */ 99 100 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, 101 unsigned long prot, unsigned long flags, unsigned long fd, 102 unsigned long pgoff) 103 { 104 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 105 we have. */ 106 return sys_mmap_pgoff(addr, len, prot, flags, fd, 107 pgoff >> (PAGE_SHIFT - 12)); 108 } 109 110 asmlinkage long sys_mmap(unsigned long addr, unsigned long len, 111 unsigned long prot, unsigned long flags, unsigned long fd, 112 unsigned long off) 113 { 114 /* no alignment check? */ 115 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 116 } 117 118 long sparc_remap_file_pages(unsigned long start, unsigned long size, 119 unsigned long prot, unsigned long pgoff, 120 unsigned long flags) 121 { 122 /* This works on an existing mmap so we don't need to validate 123 * the range as that was done at the original mmap call. 124 */ 125 return sys_remap_file_pages(start, size, prot, 126 (pgoff >> (PAGE_SHIFT - 12)), flags); 127 } 128 129 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 130 asmlinkage unsigned long 131 c_sys_nis_syscall (struct pt_regs *regs) 132 { 133 static int count = 0; 134 135 if (count++ > 5) 136 return -ENOSYS; 137 printk ("%s[%d]: Unimplemented SPARC system call %d\n", 138 current->comm, task_pid_nr(current), (int)regs->u_regs[1]); 139 #ifdef DEBUG_UNIMP_SYSCALL 140 show_regs (regs); 141 #endif 142 return -ENOSYS; 143 } 144 145 /* #define DEBUG_SPARC_BREAKPOINT */ 146 147 asmlinkage void 148 sparc_breakpoint (struct pt_regs *regs) 149 { 150 siginfo_t info; 151 152 #ifdef DEBUG_SPARC_BREAKPOINT 153 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); 154 #endif 155 info.si_signo = SIGTRAP; 156 info.si_errno = 0; 157 info.si_code = TRAP_BRKPT; 158 info.si_addr = (void __user *)regs->pc; 159 info.si_trapno = 0; 160 force_sig_info(SIGTRAP, &info, current); 161 162 #ifdef DEBUG_SPARC_BREAKPOINT 163 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); 164 #endif 165 } 166 167 SYSCALL_DEFINE3(sparc_sigaction, int, sig, 168 struct old_sigaction __user *,act, 169 struct old_sigaction __user *,oact) 170 { 171 WARN_ON_ONCE(sig >= 0); 172 return sys_sigaction(-sig, act, oact); 173 } 174 175 SYSCALL_DEFINE5(rt_sigaction, int, sig, 176 const struct sigaction __user *, act, 177 struct sigaction __user *, oact, 178 void __user *, restorer, 179 size_t, sigsetsize) 180 { 181 struct k_sigaction new_ka, old_ka; 182 int ret; 183 184 /* XXX: Don't preclude handling different sized sigset_t's. */ 185 if (sigsetsize != sizeof(sigset_t)) 186 return -EINVAL; 187 188 if (act) { 189 new_ka.ka_restorer = restorer; 190 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 191 return -EFAULT; 192 } 193 194 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 195 196 if (!ret && oact) { 197 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 198 return -EFAULT; 199 } 200 201 return ret; 202 } 203 204 asmlinkage long sys_getdomainname(char __user *name, int len) 205 { 206 int nlen, err; 207 208 if (len < 0) 209 return -EINVAL; 210 211 down_read(&uts_sem); 212 213 nlen = strlen(utsname()->domainname) + 1; 214 err = -EINVAL; 215 if (nlen > len) 216 goto out; 217 218 err = -EFAULT; 219 if (!copy_to_user(name, utsname()->domainname, nlen)) 220 err = 0; 221 222 out: 223 up_read(&uts_sem); 224 return err; 225 } 226