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Annotation of sys/kern/kern_xxx.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: kern_xxx.c,v 1.10 2005/11/28 00:14:29 jsg Exp $       */
                      2: /*     $NetBSD: kern_xxx.c,v 1.32 1996/04/22 01:38:41 christos Exp $   */
                      3:
                      4: /*
                      5:  * Copyright (c) 1982, 1986, 1989, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)kern_xxx.c  8.2 (Berkeley) 11/14/93
                     33:  */
                     34:
                     35: #include <sys/param.h>
                     36: #include <sys/systm.h>
                     37: #include <sys/kernel.h>
                     38: #include <sys/proc.h>
                     39: #include <sys/reboot.h>
                     40: #include <uvm/uvm_extern.h>
                     41: #include <sys/sysctl.h>
                     42: #include <sys/mount.h>
                     43: #include <sys/syscallargs.h>
                     44:
                     45: /* ARGSUSED */
                     46: int
                     47: sys_reboot(struct proc *p, void *v, register_t *retval)
                     48: {
                     49:        struct sys_reboot_args /* {
                     50:                syscallarg(int) opt;
                     51:        } */ *uap = v;
                     52:        int error;
                     53:
                     54:        if ((error = suser(p, 0)) != 0)
                     55:                return (error);
                     56:        boot(SCARG(uap, opt));
                     57:        return (0);
                     58: }
                     59:
                     60: #if !defined(NO_PROPOLICE)
                     61: void __stack_smash_handler(char [], int __attribute__((unused)));
                     62:
                     63: void
                     64: __stack_smash_handler(char func[], int damaged)
                     65: {
                     66:        panic("smashed stack in %s", func);
                     67: }
                     68: #endif
                     69:
                     70: #ifdef SYSCALL_DEBUG
                     71: #define        SCDEBUG_CALLS           0x0001  /* show calls */
                     72: #define        SCDEBUG_RETURNS         0x0002  /* show returns */
                     73: #define        SCDEBUG_ALL             0x0004  /* even syscalls that are implemented */
                     74: #define        SCDEBUG_SHOWARGS        0x0008  /* show arguments to calls */
                     75:
                     76: int    scdebug = SCDEBUG_CALLS|SCDEBUG_RETURNS|SCDEBUG_SHOWARGS;
                     77:
                     78: void
                     79: scdebug_call(struct proc *p, register_t code, register_t args[])
                     80: {
                     81:        struct sysent *sy;
                     82:        struct emul *em;
                     83:        int i;
                     84:
                     85:        if (!(scdebug & SCDEBUG_CALLS))
                     86:                return;
                     87:
                     88:        em = p->p_emul;
                     89:        sy = &em->e_sysent[code];
                     90:        if (!(scdebug & SCDEBUG_ALL || code < 0 || code >= em->e_nsysent ||
                     91:             sy->sy_call == sys_nosys))
                     92:                return;
                     93:
                     94:        printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
                     95:        if (code < 0 || code >= em->e_nsysent)
                     96:                printf("OUT OF RANGE (%d)", code);
                     97:        else {
                     98:                printf("%d call: %s", code, em->e_syscallnames[code]);
                     99:                if (scdebug & SCDEBUG_SHOWARGS) {
                    100:                        printf("(");
                    101:                        for (i = 0; i < sy->sy_argsize / sizeof(register_t);
                    102:                            i++)
                    103:                                printf("%s0x%lx", i == 0 ? "" : ", ",
                    104:                                    (long)args[i]);
                    105:                        printf(")");
                    106:                }
                    107:        }
                    108:        printf("\n");
                    109: }
                    110:
                    111: void
                    112: scdebug_ret(struct proc *p, register_t code, int error, register_t retval[])
                    113: {
                    114:        struct sysent *sy;
                    115:        struct emul *em;
                    116:
                    117:        if (!(scdebug & SCDEBUG_RETURNS))
                    118:                return;
                    119:
                    120:        em = p->p_emul;
                    121:        sy = &em->e_sysent[code];
                    122:        if (!(scdebug & SCDEBUG_ALL || code < 0 || code >= em->e_nsysent ||
                    123:            sy->sy_call == sys_nosys))
                    124:                return;
                    125:
                    126:        printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
                    127:        if (code < 0 || code >= em->e_nsysent)
                    128:                printf("OUT OF RANGE (%d)", code);
                    129:        else
                    130:                printf("%d ret: err = %d, rv = 0x%lx,0x%lx", code,
                    131:                    error, (long)retval[0], (long)retval[1]);
                    132:        printf("\n");
                    133: }
                    134: #endif /* SYSCALL_DEBUG */