sys_sparc.c
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上传日期:2013-02-24
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- /* $Id: sys_sparc.c,v 1.70 2001/04/14 01:12:02 davem Exp $
- * linux/arch/sparc/kernel/sys_sparc.c
- *
- * This file contains various random system calls that
- * have a non-standard calling sequence on the Linux/sparc
- * platform.
- */
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <linux/fs.h>
- #include <linux/file.h>
- #include <linux/sem.h>
- #include <linux/msg.h>
- #include <linux/shm.h>
- #include <linux/stat.h>
- #include <linux/mman.h>
- #include <linux/utsname.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <asm/uaccess.h>
- #include <asm/ipc.h>
- /* #define DEBUG_UNIMP_SYSCALL */
- /* XXX Make this per-binary type, this way we can detect the type of
- * XXX a binary. Every Sparc executable calls this very early on.
- */
- asmlinkage unsigned long sys_getpagesize(void)
- {
- return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
- }
- #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
- unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
- {
- struct vm_area_struct * vmm;
- if (flags & MAP_FIXED) {
- /* We do not accept a shared mapping if it would violate
- * cache aliasing constraints.
- */
- if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
- return -EINVAL;
- return addr;
- }
- /* See asm-sparc/uaccess.h */
- if (len > TASK_SIZE - PAGE_SIZE)
- return -ENOMEM;
- if (ARCH_SUN4C_SUN4 && len > 0x20000000)
- return -ENOMEM;
- if (!addr)
- addr = TASK_UNMAPPED_BASE;
- if (flags & MAP_SHARED)
- addr = COLOUR_ALIGN(addr);
- else
- addr = PAGE_ALIGN(addr);
- for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
- /* At this point: (!vmm || addr < vmm->vm_end). */
- if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) {
- addr = PAGE_OFFSET;
- vmm = find_vma(current->mm, PAGE_OFFSET);
- }
- if (TASK_SIZE - PAGE_SIZE - len < addr)
- return -ENOMEM;
- if (!vmm || addr + len <= vmm->vm_start)
- return addr;
- addr = vmm->vm_end;
- if (flags & MAP_SHARED)
- addr = COLOUR_ALIGN(addr);
- }
- }
- extern asmlinkage unsigned long sys_brk(unsigned long brk);
- asmlinkage unsigned long sparc_brk(unsigned long brk)
- {
- if(ARCH_SUN4C_SUN4) {
- if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
- return current->mm->brk;
- }
- return sys_brk(brk);
- }
- /*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
- asmlinkage int sparc_pipe(struct pt_regs *regs)
- {
- int fd[2];
- int error;
- error = do_pipe(fd);
- if (error)
- goto out;
- regs->u_regs[UREG_I1] = fd[1];
- error = fd[0];
- 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 *ptr, long fifth)
- {
- int version, err;
- version = call >> 16; /* hack for backward compatibility */
- call &= 0xffff;
- if (call <= SEMCTL)
- switch (call) {
- case SEMOP:
- err = sys_semop (first, (struct sembuf *)ptr, second);
- goto out;
- case SEMGET:
- err = sys_semget (first, second, third);
- goto out;
- case SEMCTL: {
- union semun fourth;
- err = -EINVAL;
- if (!ptr)
- goto out;
- err = -EFAULT;
- if(get_user(fourth.__pad, (void **)ptr))
- goto out;
- err = sys_semctl (first, second, third, fourth);
- goto out;
- }
- default:
- err = -EINVAL;
- goto out;
- }
- if (call <= MSGCTL)
- switch (call) {
- case MSGSND:
- err = sys_msgsnd (first, (struct msgbuf *) ptr,
- second, third);
- goto out;
- case MSGRCV:
- switch (version) {
- case 0: {
- struct ipc_kludge tmp;
- err = -EINVAL;
- if (!ptr)
- goto out;
- err = -EFAULT;
- if(copy_from_user(&tmp,(struct ipc_kludge *) ptr, sizeof (tmp)))
- goto out;
- err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
- goto out;
- }
- case 1: default:
- err = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
- goto out;
- }
- case MSGGET:
- err = sys_msgget ((key_t) first, second);
- goto out;
- case MSGCTL:
- err = sys_msgctl (first, second, (struct msqid_ds *) ptr);
- goto out;
- default:
- err = -EINVAL;
- goto out;
- }
- if (call <= SHMCTL)
- switch (call) {
- case SHMAT:
- switch (version) {
- case 0: default: {
- ulong raddr;
- err = sys_shmat (first, (char *) ptr, second, &raddr);
- if (err)
- goto out;
- err = -EFAULT;
- if(put_user (raddr, (ulong *) third))
- goto out;
- err = 0;
- goto out;
- }
- case 1: /* iBCS2 emulator entry point */
- err = sys_shmat (first, (char *) ptr, second, (ulong *) third);
- goto out;
- }
- case SHMDT:
- err = sys_shmdt ((char *)ptr);
- goto out;
- case SHMGET:
- err = sys_shmget (first, second, third);
- goto out;
- case SHMCTL:
- err = sys_shmctl (first, second, (struct shmid_ds *) ptr);
- goto out;
- default:
- err = -EINVAL;
- goto out;
- }
- else
- err = -EINVAL;
- out:
- return err;
- }
- /* Linux version of mmap */
- static unsigned long do_mmap2(unsigned long addr, unsigned long len,
- unsigned long prot, unsigned long flags, unsigned long fd,
- unsigned long pgoff)
- {
- struct file * file = NULL;
- unsigned long retval = -EBADF;
- if (!(flags & MAP_ANONYMOUS)) {
- file = fget(fd);
- if (!file)
- goto out;
- }
- retval = -EINVAL;
- len = PAGE_ALIGN(len);
- if (ARCH_SUN4C_SUN4 &&
- (len > 0x20000000 ||
- ((flags & MAP_FIXED) &&
- addr < 0xe0000000 && addr + len > 0x20000000)))
- goto out_putf;
- /* See asm-sparc/uaccess.h */
- if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
- goto out_putf;
- flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- down_write(¤t->mm->mmap_sem);
- retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
- up_write(¤t->mm->mmap_sem);
- out_putf:
- if (file)
- fput(file);
- out:
- return retval;
- }
- asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
- unsigned long prot, unsigned long flags, unsigned long fd,
- unsigned long pgoff)
- {
- /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
- we have. */
- return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
- }
- asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
- unsigned long prot, unsigned long flags, unsigned long fd,
- unsigned long off)
- {
- return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
- }
- extern unsigned long do_mremap(unsigned long addr,
- unsigned long old_len, unsigned long new_len,
- unsigned long flags, unsigned long new_addr);
-
- asmlinkage unsigned long sparc_mremap(unsigned long addr,
- unsigned long old_len, unsigned long new_len,
- unsigned long flags, unsigned long new_addr)
- {
- struct vm_area_struct *vma;
- unsigned long ret = -EINVAL;
- if (ARCH_SUN4C_SUN4) {
- if (old_len > 0x20000000 || new_len > 0x20000000)
- goto out;
- if (addr < 0xe0000000 && addr + old_len > 0x20000000)
- goto out;
- }
- if (old_len > TASK_SIZE - PAGE_SIZE ||
- new_len > TASK_SIZE - PAGE_SIZE)
- goto out;
- down_write(¤t->mm->mmap_sem);
- if (flags & MREMAP_FIXED) {
- if (ARCH_SUN4C_SUN4 &&
- new_addr < 0xe0000000 &&
- new_addr + new_len > 0x20000000)
- goto out_sem;
- if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
- goto out_sem;
- } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
- addr + new_len > 0x20000000) ||
- addr + new_len > TASK_SIZE - PAGE_SIZE) {
- 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;
- }
- 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(¤t->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 = 0;
-
- if (count++ > 5) return -ENOSYS;
- printk ("%s[%d]: Unimplemented SPARC system call %dn", current->comm, current->pid, (int)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;
- lock_kernel();
- #ifdef DEBUG_SPARC_BREAKPOINT
- printk ("TRAP: Entering kernel PC=%x, nPC=%xn", regs->pc, regs->npc);
- #endif
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
- info.si_addr = (void *)regs->pc;
- info.si_trapno = 0;
- force_sig_info(SIGTRAP, &info, current);
- #ifdef DEBUG_SPARC_BREAKPOINT
- printk ("TRAP: Returning to space: PC=%x nPC=%xn", regs->pc, regs->npc);
- #endif
- unlock_kernel();
- }
- asmlinkage int
- sparc_sigaction (int sig, const struct old_sigaction *act,
- struct old_sigaction *oact)
- {
- struct k_sigaction new_ka, old_ka;
- int ret;
- if (sig < 0) {
- current->thread.new_signal = 1;
- sig = -sig;
- }
- if (act) {
- unsigned long mask;
- if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
- __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
- __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
- return -EFAULT;
- __get_user(new_ka.sa.sa_flags, &act->sa_flags);
- __get_user(mask, &act->sa_mask);
- siginitset(&new_ka.sa.sa_mask, mask);
- new_ka.ka_restorer = NULL;
- }
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
- if (!ret && oact) {
- /* In the clone() case we could copy half consistant
- * state to the user, however this could sleep and
- * deadlock us if we held the signal lock on SMP. So for
- * now I take the easy way out and do no locking.
- */
- if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
- __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
- __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
- return -EFAULT;
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
- }
- return ret;
- }
- 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;
- /* All tasks which use RT signals (effectively) use
- * new style signals.
- */
- current->thread.new_signal = 1;
- 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;
- }
- /* Just in case some old old binary calls this. */
- asmlinkage int sys_pause(void)
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- return -ERESTARTNOHAND;
- }
- 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;
- }