sys_sparc.c

microwindows移植到S3C44B0的源码

	down_write(&current->mm->mmap_sem);
	if (flags & MREMAP_FIXED) {
		if (new_addr < PAGE_OFFSET &&
		    new_addr + new_len > -PAGE_OFFSET)
			goto out_sem;
	} else if (addr < PAGE_OFFSET && addr + new_len > -PAGE_OFFSET) {
		unsigned long map_flags = 0;
		struct file *file = NULL;

		ret = -ENOMEM;
		if (!(flags & MREMAP_MAYMOVE))
			goto out_sem;

		vma = find_vma(current->mm, addr);
		if (vma) {
			if (vma->vm_flags & VM_SHARED)
				map_flags |= MAP_SHARED;
			file = vma->vm_file;
		}

		/* MREMAP_FIXED checked above. */
		new_addr = get_unmapped_area(file, addr, new_len,
				    vma ? vma->vm_pgoff : 0,
				    map_flags);
		ret = new_addr;
		if (new_addr & ~PAGE_MASK)
			goto out_sem;
		flags |= MREMAP_FIXED;
	}
	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
out_sem:
	up_write(&current->mm->mmap_sem);
out:
	return ret;       
}

/* we come to here via sys_nis_syscall so it can setup the regs argument */
asmlinkage unsigned long
c_sys_nis_syscall (struct pt_regs *regs)
{
	static int count;
	
	/* Don't make the system unusable, if someone goes stuck */
	if (count++ > 5)
		return -ENOSYS;

	printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
#ifdef DEBUG_UNIMP_SYSCALL	
	show_regs (regs);
#endif

	return -ENOSYS;
}

/* #define DEBUG_SPARC_BREAKPOINT */

asmlinkage void
sparc_breakpoint (struct pt_regs *regs)
{
	siginfo_t info;

	if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
		regs->tpc &= 0xffffffff;
		regs->tnpc &= 0xffffffff;
	}
#ifdef DEBUG_SPARC_BREAKPOINT
        printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
	info.si_signo = SIGTRAP;
	info.si_errno = 0;
	info.si_code = TRAP_BRKPT;
	info.si_addr = (void *)regs->tpc;
	info.si_trapno = 0;
	force_sig_info(SIGTRAP, &info, current);
#ifdef DEBUG_SPARC_BREAKPOINT
	printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
}

extern void check_pending(int signum);

asmlinkage int sys_getdomainname(char *name, int len)
{
        int nlen;
	int err = -EFAULT;

 	down_read(&uts_sem);
 	
	nlen = strlen(system_utsname.domainname) + 1;

        if (nlen < len)
                len = nlen;
	if(len > __NEW_UTS_LEN)
		goto done;
	if(copy_to_user(name, system_utsname.domainname, len))
		goto done;
	err = 0;
done:
	up_read(&uts_sem);
	return err;
}

/* only AP+ systems have sys_aplib */
asmlinkage int sys_aplib(void)
{
	return -ENOSYS;
}

asmlinkage int solaris_syscall(struct pt_regs *regs)
{
	static int count;

	regs->tpc = regs->tnpc;
	regs->tnpc += 4;
	if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
		regs->tpc &= 0xffffffff;
		regs->tnpc &= 0xffffffff;
	}
	if(++count <= 5) {
		printk ("For Solaris binary emulation you need solaris module loaded\n");
		show_regs (regs);
	}
	send_sig(SIGSEGV, current, 1);

	return -ENOSYS;
}

#ifndef CONFIG_SUNOS_EMUL
asmlinkage int sunos_syscall(struct pt_regs *regs)
{
	static int count;

	regs->tpc = regs->tnpc;
	regs->tnpc += 4;
	if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
		regs->tpc &= 0xffffffff;
		regs->tnpc &= 0xffffffff;
	}
	if(++count <= 20)
		printk ("SunOS binary emulation not compiled in\n");
	force_sig(SIGSEGV, current);

	return -ENOSYS;
}
#endif

asmlinkage int sys_utrap_install(utrap_entry_t type, utrap_handler_t new_p,
				 utrap_handler_t new_d,
				 utrap_handler_t *old_p, utrap_handler_t *old_d)
{
	if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
		return -EINVAL;
	if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
		if (old_p) {
			if (!current->thread.utraps) {
				if (put_user(NULL, old_p))
					return -EFAULT;
			} else {
				if (put_user((utrap_handler_t)(current->thread.utraps[type]), old_p))
					return -EFAULT;
			}
		}
		if (old_d) {
			if (put_user(NULL, old_d))
				return -EFAULT;
		}
		return 0;
	}
	if (!current->thread.utraps) {
		current->thread.utraps =
			kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
		if (!current->thread.utraps) return -ENOMEM;
		current->thread.utraps[0] = 1;
		memset(current->thread.utraps+1, 0, UT_TRAP_INSTRUCTION_31*sizeof(long));
	} else {
		if ((utrap_handler_t)current->thread.utraps[type] != new_p &&
		    current->thread.utraps[0] > 1) {
			long *p = current->thread.utraps;

			current->thread.utraps =
				kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
					GFP_KERNEL);
			if (!current->thread.utraps) {
				current->thread.utraps = p;
				return -ENOMEM;
			}
			p[0]--;
			current->thread.utraps[0] = 1;
			memcpy(current->thread.utraps+1, p+1,
			       UT_TRAP_INSTRUCTION_31*sizeof(long));
		}
	}
	if (old_p) {
		if (put_user((utrap_handler_t)(current->thread.utraps[type]), old_p))
			return -EFAULT;
	}
	if (old_d) {
		if (put_user(NULL, old_d))
			return -EFAULT;
	}
	current->thread.utraps[type] = (long)new_p;

	return 0;
}

long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
{
	if (model >= 3)
		return -EINVAL;
	regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
	return 0;
}

asmlinkage int
sys_rt_sigaction(int sig, const struct sigaction *act, struct sigaction *oact,
		 void *restorer, size_t sigsetsize)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

	/* XXX: Don't preclude handling different sized sigset_t's.  */
	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	if (act) {
		new_ka.ka_restorer = restorer;
		if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
			return -EFAULT;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
			return -EFAULT;
	}

	return ret;
}

/* Invoked by rtrap code to update performance counters in
 * user space.
 */
asmlinkage void
update_perfctrs(void)
{
	unsigned long pic, tmp;

	read_pic(pic);
	tmp = (current->thread.kernel_cntd0 += (unsigned int)pic);
	__put_user(tmp, current->thread.user_cntd0);
	tmp = (current->thread.kernel_cntd1 += (pic >> 32));
	__put_user(tmp, current->thread.user_cntd1);
	reset_pic();
}

asmlinkage int
sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
{
	int err = 0;

	switch(opcode) {
	case PERFCTR_ON:
		current->thread.pcr_reg = arg2;
		current->thread.user_cntd0 = (u64 *) arg0;
		current->thread.user_cntd1 = (u64 *) arg1;
		current->thread.kernel_cntd0 =
			current->thread.kernel_cntd1 = 0;
		write_pcr(arg2);
		reset_pic();
		current->thread.flags |= SPARC_FLAG_PERFCTR;
		break;

	case PERFCTR_OFF:
		err = -EINVAL;
		if ((current->thread.flags & SPARC_FLAG_PERFCTR) != 0) {
			current->thread.user_cntd0 =
				current->thread.user_cntd1 = NULL;
			current->thread.pcr_reg = 0;
			write_pcr(0);
			current->thread.flags &= ~(SPARC_FLAG_PERFCTR);
			err = 0;
		}
		break;

	case PERFCTR_READ: {
		unsigned long pic, tmp;

		if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
			err = -EINVAL;
			break;
		}
		read_pic(pic);
		tmp = (current->thread.kernel_cntd0 += (unsigned int)pic);
		err |= __put_user(tmp, current->thread.user_cntd0);
		tmp = (current->thread.kernel_cntd1 += (pic >> 32));
		err |= __put_user(tmp, current->thread.user_cntd1);
		reset_pic();
		break;
	}

	case PERFCTR_CLRPIC:
		if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
			err = -EINVAL;
			break;
		}
		current->thread.kernel_cntd0 =
			current->thread.kernel_cntd1 = 0;
		reset_pic();
		break;

	case PERFCTR_SETPCR: {
		u64 *user_pcr = (u64 *)arg0;
		if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
			err = -EINVAL;
			break;
		}
		err |= __get_user(current->thread.pcr_reg, user_pcr);
		write_pcr(current->thread.pcr_reg);
		current->thread.kernel_cntd0 =
			current->thread.kernel_cntd1 = 0;
		reset_pic();
		break;
	}

	case PERFCTR_GETPCR: {
		u64 *user_pcr = (u64 *)arg0;
		if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
			err = -EINVAL;
			break;
		}
		err |= __put_user(current->thread.pcr_reg, user_pcr);
		break;
	}

	default:
		err = -EINVAL;
		break;
	};
	return err;
}