301 строка
7.4 KiB
C
301 строка
7.4 KiB
C
/* linux/arch/sparc/kernel/sys_sparc.c
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/sparc
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/utsname.h>
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#include <linux/smp.h>
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#include <linux/ipc.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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/* #define DEBUG_UNIMP_SYSCALL */
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/* XXX Make this per-binary type, this way we can detect the type of
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* XXX a binary. Every Sparc executable calls this very early on.
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*/
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asmlinkage unsigned long sys_getpagesize(void)
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{
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return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
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}
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#define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct vm_area_struct * vmm;
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if (flags & MAP_FIXED) {
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/* We do not accept a shared mapping if it would violate
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* cache aliasing constraints.
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*/
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if ((flags & MAP_SHARED) &&
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((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
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return -EINVAL;
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return addr;
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}
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/* See asm-sparc/uaccess.h */
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if (len > TASK_SIZE - PAGE_SIZE)
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return -ENOMEM;
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if (ARCH_SUN4C && len > 0x20000000)
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return -ENOMEM;
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if (!addr)
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addr = TASK_UNMAPPED_BASE;
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if (flags & MAP_SHARED)
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addr = COLOUR_ALIGN(addr);
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else
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addr = PAGE_ALIGN(addr);
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for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
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/* At this point: (!vmm || addr < vmm->vm_end). */
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if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
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addr = PAGE_OFFSET;
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vmm = find_vma(current->mm, PAGE_OFFSET);
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}
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if (TASK_SIZE - PAGE_SIZE - len < addr)
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return -ENOMEM;
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if (!vmm || addr + len <= vmm->vm_start)
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return addr;
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addr = vmm->vm_end;
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if (flags & MAP_SHARED)
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addr = COLOUR_ALIGN(addr);
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}
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}
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way unix traditionally does this, though.
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*/
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asmlinkage int sparc_pipe(struct pt_regs *regs)
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{
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int fd[2];
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int error;
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error = do_pipe_flags(fd, 0);
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if (error)
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goto out;
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regs->u_regs[UREG_I1] = fd[1];
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error = fd[0];
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out:
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return error;
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}
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int sparc_mmap_check(unsigned long addr, unsigned long len)
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{
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if (ARCH_SUN4C &&
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(len > 0x20000000 ||
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(addr < 0xe0000000 && addr + len > 0x20000000)))
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return -EINVAL;
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/* See asm-sparc/uaccess.h */
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if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
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return -EINVAL;
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return 0;
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}
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/* Linux version of mmap */
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asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long fd,
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unsigned long pgoff)
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{
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/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
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we have. */
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return sys_mmap_pgoff(addr, len, prot, flags, fd,
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pgoff >> (PAGE_SHIFT - 12));
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}
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asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long fd,
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unsigned long off)
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{
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/* no alignment check? */
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return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
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}
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long sparc_remap_file_pages(unsigned long start, unsigned long size,
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unsigned long prot, unsigned long pgoff,
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unsigned long flags)
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{
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/* This works on an existing mmap so we don't need to validate
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* the range as that was done at the original mmap call.
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*/
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return sys_remap_file_pages(start, size, prot,
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(pgoff >> (PAGE_SHIFT - 12)), flags);
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}
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/* we come to here via sys_nis_syscall so it can setup the regs argument */
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asmlinkage unsigned long
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c_sys_nis_syscall (struct pt_regs *regs)
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{
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static int count = 0;
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if (count++ > 5)
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return -ENOSYS;
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printk ("%s[%d]: Unimplemented SPARC system call %d\n",
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current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
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#ifdef DEBUG_UNIMP_SYSCALL
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show_regs (regs);
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#endif
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return -ENOSYS;
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}
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/* #define DEBUG_SPARC_BREAKPOINT */
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asmlinkage void
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sparc_breakpoint (struct pt_regs *regs)
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{
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siginfo_t info;
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#ifdef DEBUG_SPARC_BREAKPOINT
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printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
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#endif
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info.si_signo = SIGTRAP;
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info.si_errno = 0;
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info.si_code = TRAP_BRKPT;
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info.si_addr = (void __user *)regs->pc;
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info.si_trapno = 0;
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force_sig_info(SIGTRAP, &info, current);
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#ifdef DEBUG_SPARC_BREAKPOINT
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printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
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#endif
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}
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asmlinkage int
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sparc_sigaction (int sig, const struct old_sigaction __user *act,
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struct old_sigaction __user *oact)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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WARN_ON_ONCE(sig >= 0);
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sig = -sig;
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if (act) {
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unsigned long mask;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
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__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
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__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
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return -EFAULT;
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__get_user(new_ka.sa.sa_flags, &act->sa_flags);
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__get_user(mask, &act->sa_mask);
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siginitset(&new_ka.sa.sa_mask, mask);
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new_ka.ka_restorer = NULL;
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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/* In the clone() case we could copy half consistent
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* state to the user, however this could sleep and
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* deadlock us if we held the signal lock on SMP. So for
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* now I take the easy way out and do no locking.
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*/
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
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__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
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__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
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return -EFAULT;
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__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
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}
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return ret;
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}
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asmlinkage long
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sys_rt_sigaction(int sig,
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const struct sigaction __user *act,
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struct sigaction __user *oact,
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void __user *restorer,
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size_t sigsetsize)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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/* XXX: Don't preclude handling different sized sigset_t's. */
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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if (act) {
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new_ka.ka_restorer = restorer;
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if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
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return -EFAULT;
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
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return -EFAULT;
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}
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return ret;
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}
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asmlinkage int sys_getdomainname(char __user *name, int len)
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{
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int nlen, err;
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if (len < 0)
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return -EINVAL;
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down_read(&uts_sem);
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nlen = strlen(utsname()->domainname) + 1;
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err = -EINVAL;
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if (nlen > len)
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goto out;
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err = -EFAULT;
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if (!copy_to_user(name, utsname()->domainname, nlen))
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err = 0;
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out:
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up_read(&uts_sem);
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return err;
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}
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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*/
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int kernel_execve(const char *filename,
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const char *const argv[],
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const char *const envp[])
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{
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long __res;
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register long __g1 __asm__ ("g1") = __NR_execve;
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register long __o0 __asm__ ("o0") = (long)(filename);
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register long __o1 __asm__ ("o1") = (long)(argv);
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register long __o2 __asm__ ("o2") = (long)(envp);
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asm volatile ("t 0x10\n\t"
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"bcc 1f\n\t"
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"mov %%o0, %0\n\t"
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"sub %%g0, %%o0, %0\n\t"
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"1:\n\t"
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: "=r" (__res), "=&r" (__o0)
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: "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
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: "cc");
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return __res;
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}
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