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