/* * linux/arch/m32r/kernel/sys_m32r.c * * This file contains various random system calls that * have a non-standard calling sequence on the Linux/M32R platform. * * Taken from i386 version. */ #include <linux/errno.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/smp.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/shm.h> #include <linux/stat.h> #include <linux/syscalls.h> #include <linux/mman.h> #include <linux/file.h> #include <linux/utsname.h> #include <linux/ipc.h> #include <asm/uaccess.h> #include <asm/cachectl.h> #include <asm/cacheflush.h> #include <asm/syscall.h> #include <asm/unistd.h> /* * sys_tas() - test-and-set */ asmlinkage int sys_tas(int __user *addr) { int oldval; if (!access_ok(VERIFY_WRITE, addr, sizeof (int))) return -EFAULT; /* atomic operation: * oldval = *addr; *addr = 1; */ __asm__ __volatile__ ( DCACHE_CLEAR("%0", "r4", "%1") " .fillinsn\n" "1:\n" " lock %0, @%1 -> unlock %2, @%1\n" "2:\n" /* NOTE: * The m32r processor can accept interrupts only * at the 32-bit instruction boundary. * So, in the above code, the "unlock" instruction * can be executed continuously after the "lock" * instruction execution without any interruptions. */ ".section .fixup,\"ax\"\n" " .balign 4\n" "3: ldi %0, #%3\n" " seth r14, #high(2b)\n" " or3 r14, r14, #low(2b)\n" " jmp r14\n" ".previous\n" ".section __ex_table,\"a\"\n" " .balign 4\n" " .long 1b,3b\n" ".previous\n" : "=&r" (oldval) : "r" (addr), "r" (1), "i"(-EFAULT) : "r14", "memory" #ifdef CONFIG_CHIP_M32700_TS1 , "r4" #endif /* CONFIG_CHIP_M32700_TS1 */ ); return oldval; } asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) { int error = -EBADF; struct file *file = NULL; flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } down_write(¤t->mm->mmap_sem); error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); if (file) fput(file); out: return error; } /* * sys_ipc() is the de-multiplexer for the SysV IPC calls.. * * This is really horribly ugly. */ asmlinkage int sys_ipc(uint call, int first, int second, int third, void __user *ptr, long fifth) { int version, ret; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; switch (call) { case SEMOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL); case SEMTIMEDOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, (const struct timespec __user *)fifth); case SEMGET: return sys_semget (first, second, third); case SEMCTL: { union semun fourth; if (!ptr) return -EINVAL; if (get_user(fourth.__pad, (void __user * __user *) ptr)) return -EFAULT; return sys_semctl (first, second, third, fourth); } case MSGSND: return sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; if (!ptr) return -EINVAL; if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp))) return -EFAULT; return sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third); } default: return sys_msgrcv (first, (struct msgbuf __user *) ptr, second, fifth, third); } case MSGGET: return sys_msgget ((key_t) first, second); case MSGCTL: return sys_msgctl (first, second, (struct msqid_ds __user *) ptr); case SHMAT: { ulong raddr; if (!access_ok(VERIFY_WRITE, (ulong __user *) third, sizeof(ulong))) return -EFAULT; ret = do_shmat (first, (char __user *) ptr, second, &raddr); if (ret) return ret; return put_user (raddr, (ulong __user *) third); } case SHMDT: return sys_shmdt ((char __user *)ptr); case SHMGET: return sys_shmget (first, second, third); case SHMCTL: return sys_shmctl (first, second, (struct shmid_ds __user *) ptr); default: return -ENOSYS; } } asmlinkage int sys_uname(struct old_utsname __user * name) { int err; if (!name) return -EFAULT; down_read(&uts_sem); err = copy_to_user(name, utsname(), sizeof (*name)); up_read(&uts_sem); return err?-EFAULT:0; } asmlinkage int sys_cacheflush(void *addr, int bytes, int cache) { /* This should flush more selectively ... */ _flush_cache_all(); return 0; } asmlinkage int sys_cachectl(char *addr, int nbytes, int op) { /* Not implemented yet. */ return -ENOSYS; } /* * Do a system call from kernel instead of calling sys_execve so we * end up with proper pt_regs. */ int kernel_execve(const char *filename, char *const argv[], char *const envp[]) { register long __scno __asm__ ("r7") = __NR_execve; register long __arg3 __asm__ ("r2") = (long)(envp); register long __arg2 __asm__ ("r1") = (long)(argv); register long __res __asm__ ("r0") = (long)(filename); __asm__ __volatile__ ( "trap #" SYSCALL_VECTOR "|| nop" : "=r" (__res) : "r" (__scno), "0" (__res), "r" (__arg2), "r" (__arg3) : "memory"); return __res; }