usr.bin/gcore/md-sparc.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This software was developed by the Computer Systems Engineering group
   6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   7  * contributed to Berkeley.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  * @(#)md-sparc.c       8.1 (Berkeley) 6/6/93
  38  *
  39  * $DragonFly: src/usr.bin/gcore/md-sparc.c,v 1.5 2005/04/10 20:55:38 drhodus Exp $
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/time.h>
  44 #include <sys/file.h>
  45 #include <sys/stat.h>
  46 #include <sys/user.h>
  47 #include <sys/sysctl.h>
  48 #include <machine/vmparam.h>
  49
  50 #include <err.h>
  51 #include <kvm.h>
  52 #include <unistd.h>
  53 #include <stdio.h>
  54 #include <string.h>
  55 #include "extern.h"
  56
  57 #ifndef offsetof
  58 #define offsetof(s, f) ((int)&((s *)0)->f)
  59 #endif
  60
  61 static void
  62 shift_page(int fd, off_t off, int ssize)
  63 {
  64         char buffer[NBPG];
  65
  66         (void)lseek(fd, (off_t)-NBPG, SEEK_END);
  67         for (; ssize > 0; ssize -= NBPG) {
  68                 (void)read(fd, buffer, NBPG);
  69                 (void)write(fd, buffer, NBPG);
  70                 (void)lseek(fd, (off_t)-2 * NBPG, SEEK_CUR);
  71         }
  72 }
  73
  74 /*
  75  * Fix up the core image for the sparc.  We need to flush any register
  76  * windows that are cached in the pcb out to the user stack.
  77  * Also, we need to get the trap frame and possible floating point state
  78  * from the top of the kernel stack and store it in the pcb.
  79  */
  80 void
  81 md_core(kvm_t *kd, int fd, struct kinfo_proc *ki)
  82 {
  83         struct rwindow *rw;
  84         int nsaved, cc, ssize;
  85         off_t off, s;
  86         u_long sp;
  87         struct pcb pcb;
  88         struct trapframe tf;
  89
  90         /*
  91          * Before anything else read the trapframe.  Synchronizing here
  92          * is impossible if the process is running.
  93          */
  94         cc = kvm_read(kd, (u_long)ki->kp_proc.p_md.md_tf,
  95                       /* XXX */
  96                       (void *)&tf, sizeof(tf));
  97         if (cc < 0)
  98                 errx(1, "kvm_read: %s (reading kernel trapframe)",
  99                       kvm_geterr(kd));
 100         if (cc != sizeof(tf))
 101                 errx(1, "cannot read kernel trapframe");
 102
 103         /*
 104          * Write out the real trap frame.
 105          */
 106         off = offsetof(struct user, u_md);
 107         off += offsetof(struct md_coredump, md_tf);
 108         if (lseek(fd, off, SEEK_SET) == -1)
 109                 err(1, "lseek");
 110         (void)write(fd, &tf, sizeof(tf));
 111
 112         if (ki->kp_proc.p_md.md_fpstate != 0) {
 113                 /*
 114                  * If floating point state is present, write it out too.
 115                  * It comes right after the trapframe so we don't need to seek.
 116                  */
 117                 struct fpstate fs;
 118                 cc = kvm_read(kd, (u_long)ki->kp_proc.p_md.md_fpstate,
 119                               (void *)&fs, sizeof(fs));
 120                 if (cc < 0)
 121                         errx(1, "kvm_read: %s (fpu state)", kvm_geterr(kd));
 122                 if (cc != sizeof(fs))
 123                         errx(1, "cannot read fpu state");
 124                 (void)write(fd, (char *)&fs, sizeof(fs));
 125         }
 126         /*
 127          * Read pcb.
 128          */
 129         if (lseek(fd, (off_t)offsetof(struct user, u_pcb), SEEK_SET) == -1)
 130                 err(1, "lseek");
 131         cc = read(fd, (char *)&pcb, sizeof(pcb));
 132         if (cc != sizeof(pcb)) {
 133                 if (cc < 0)
 134                         err(1, "read");
 135                 errx(1, "couldn't read pcb from core file");
 136         }
 137
 138         /*
 139          * Write any unsaved windows to the appropriate stack locations.
 140          */
 141         nsaved = pcb.pcb_nsaved;
 142         if (nsaved == 0)
 143                 return;
 144
 145         rw = &pcb.pcb_rw[0];
 146         off = ctob(UPAGES + ki->kp_eproc.e_vm.vm_dsize);
 147         ssize = ctob(ki->kp_eproc.e_vm.vm_ssize);
 148         sp = tf.tf_out[6];
 149         for (; --nsaved >= 0; ++rw) {
 150                 /*
 151                  * Copy register window into appropriate stack location.
 152                  */
 153                 s = ssize - (USRSTACK - sp);
 154                 if (s < 0) {
 155                         if (s < -NBPG)
 156                                 errx(1, "cannot copy pcb windows to stack");
 157                         /*
 158                          * It's possible to be missing the bottomost
 159                          * page because a stack page hasn't been allocated
 160                          * for the register save area.  Shift over
 161                          * the stack segment by a page, and update
 162                          * the u-area to reflect the new stack size.  YECH!
 163                          */
 164                         shift_page(fd, off, ssize);
 165                         ssize += NBPG;
 166                         s += NBPG;
 167                         ++ki->kp_eproc.e_vm.vm_ssize;
 168                         (void)lseek(fd,
 169                             (off_t)offsetof(struct user, u_kproc.kp_eproc.e_vm),
 170                             SEEK_SET);
 171                         (void)write(fd,
 172                             &ki->kp_eproc.e_vm, sizeof(ki->kp_eproc.e_vm));
 173                 }
 174                 if (lseek(fd, off + s, SEEK_SET) == -1)
 175                         errx(1, "cannot copy pcb windows to stack");
 176
 177                 (void)write(fd, rw, sizeof(*rw));
 178                 sp = rw->rw_in[6];
 179         }
 180 }