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-rw-r--r--arch/sparc/kernel/sys_sparc.c485
1 files changed, 485 insertions, 0 deletions
diff --git a/arch/sparc/kernel/sys_sparc.c b/arch/sparc/kernel/sys_sparc.c
new file mode 100644
index 000000000000..0cdfc9d294b4
--- /dev/null
+++ b/arch/sparc/kernel/sys_sparc.c
@@ -0,0 +1,485 @@
+/* $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/syscalls.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);
+ }
+}
+
+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 __user *ptr, long fifth)
+{
+ int version, err;
+
+ version = call >> 16; /* hack for backward compatibility */
+ call &= 0xffff;
+
+ if (call <= SEMCTL)
+ switch (call) {
+ case SEMOP:
+ err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
+ goto out;
+ case SEMTIMEDOP:
+ err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
+ 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 __user * __user *)ptr))
+ goto out;
+ err = sys_semctl (first, second, third, fourth);
+ goto out;
+ }
+ default:
+ err = -ENOSYS;
+ goto out;
+ }
+ if (call <= MSGCTL)
+ switch (call) {
+ case MSGSND:
+ err = sys_msgsnd (first, (struct msgbuf __user *) 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 __user *) 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 __user *) 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 __user *) ptr);
+ goto out;
+ default:
+ err = -ENOSYS;
+ goto out;
+ }
+ if (call <= SHMCTL)
+ switch (call) {
+ case SHMAT:
+ switch (version) {
+ case 0: default: {
+ ulong raddr;
+ err = do_shmat (first, (char __user *) ptr, second, &raddr);
+ if (err)
+ goto out;
+ err = -EFAULT;
+ if (put_user (raddr, (ulong __user *) third))
+ goto out;
+ err = 0;
+ goto out;
+ }
+ case 1: /* iBCS2 emulator entry point */
+ err = -EINVAL;
+ goto out;
+ }
+ case SHMDT:
+ err = sys_shmdt ((char __user *)ptr);
+ goto out;
+ case SHMGET:
+ err = sys_shmget (first, second, third);
+ goto out;
+ case SHMCTL:
+ err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
+ goto out;
+ default:
+ err = -ENOSYS;
+ goto out;
+ }
+ else
+ err = -ENOSYS;
+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(&current->mm->mmap_sem);
+ retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ up_write(&current->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);
+}
+
+long sparc_remap_file_pages(unsigned long start, unsigned long size,
+ unsigned long prot, unsigned long pgoff,
+ unsigned long flags)
+{
+ /* This works on an existing mmap so we don't need to validate
+ * the range as that was done at the original mmap call.
+ */
+ return sys_remap_file_pages(start, size, prot,
+ (pgoff >> (PAGE_SHIFT - 12)), flags);
+}
+
+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(&current->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(&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 = 0;
+
+ if (count++ > 5)
+ return -ENOSYS;
+ printk ("%s[%d]: Unimplemented SPARC system call %d\n",
+ 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=%x\n", regs->pc, regs->npc);
+#endif
+ info.si_signo = SIGTRAP;
+ info.si_errno = 0;
+ info.si_code = TRAP_BRKPT;
+ info.si_addr = (void __user *)regs->pc;
+ info.si_trapno = 0;
+ force_sig_info(SIGTRAP, &info, current);
+
+#ifdef DEBUG_SPARC_BREAKPOINT
+ printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
+#endif
+ unlock_kernel();
+}
+
+asmlinkage int
+sparc_sigaction (int sig, const struct old_sigaction __user *act,
+ struct old_sigaction __user *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 (!access_ok(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 consistent
+ * 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 (!access_ok(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 long
+sys_rt_sigaction(int sig,
+ const struct sigaction __user *act,
+ struct sigaction __user *oact,
+ void __user *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;
+}
+
+asmlinkage int sys_getdomainname(char __user *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;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.