d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use a crowbar to move the a.out code out of gcore.c and into its own

Browse Source 
file so that we have a chance of using gcore on non-i386 platforms.  Use
linker sets to reduce the registration glue.  Remove md-sparc.c, we do not
have an a.out sparc32 port.  aoutcore.c was repocopied from gcore.c.
This commit is contained in:
Peter Wemm 2002-09-13 16:33:35 +00:00
parent af656bf76b
commit e0491636b5
7 changed files with 68 additions and 577 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
usr.bin/gcore/Makefile
View File

@ -3,13 +3,11 @@
PROG= gcore
SRCS= elfcore.c gcore.c
.if ${MACHINE_ARCH} == i386
SRCS+= aoutcore.c
DPADD= ${LIBKVM}
LDADD= -lkvm
.if ${MACHINE_ARCH} != "sparc"
SRCS+= md-nop.c
.else
SRCS+= md-${MACHINE_ARCH}.c
.endif
.include <bsd.prog.mk>

143
usr.bin/gcore/aoutcore.c
View File

@ -63,6 +63,7 @@ __FBSDID("$FreeBSD$");
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/sysctl.h>
#include <sys/linker_set.h>
#include <arpa/inet.h>
#include <machine/elf.h>
@ -81,75 +82,26 @@ __FBSDID("$FreeBSD$");
#include "extern.h"
static void core(int, int, struct kinfo_proc *);
static void datadump(int, int, struct kinfo_proc *, u_long, int);
static void killed(int);
static void restart_target(void);
static void usage(void) __dead2;
static void userdump(int, struct kinfo_proc *, u_long, int);
kvm_t *kd;
static kvm_t *kd;
static int data_offset;
static pid_t pid;
static struct kinfo_proc *ki;
int
main(argc, argv)
int argc;
char *argv[];
static int
aoutident(int efd, pid_t pid, char *binfile)
{
struct kinfo_proc *ki = NULL;
struct exec exec;
int ch, cnt, efd, fd, sflag;
int cnt;
uid_t uid;
char *binfile, *corefile;
char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN];
int is_aout;
sflag = 0;
corefile = NULL;
while ((ch = getopt(argc, argv, "c:s")) != -1) {
switch (ch) {
case 'c':
corefile = optarg;
break;
case 's':
sflag = 1;
break;
default:
usage();
break;
}
}
argv += optind;
argc -= optind;
/* XXX we should check that the pid argument is really a number */
switch (argc) {
case 1:
pid = atoi(argv[0]);
asprintf(&binfile, "/proc/%d/file", pid);
if (binfile == NULL)
errx(1, "allocation failure");
break;
case 2:
pid = atoi(argv[1]);
binfile = argv[0];
break;
default:
usage();
}
efd = open(binfile, O_RDONLY, 0);
if (efd < 0)
err(1, "%s", binfile);
char errbuf[_POSIX2_LINE_MAX];
cnt = read(efd, &exec, sizeof(exec));
if (cnt != sizeof(exec))
errx(1, "%s exec header: %s",
binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
return (0);
if (!N_BADMAG(exec)) {
is_aout = 1;
/*
* This legacy a.out support uses the kvm interface instead
* of procfs.
@ -181,36 +133,9 @@ main(argc, argv)
" process %d", binfile, pid, exec.a_text,
ptoa(ki->ki_tsize));
data_offset = N_DATOFF(exec);
} else if (IS_ELF(*(Elf_Ehdr *)&exec)) {
is_aout = 0;
close(efd);
} else
errx(1, "Invalid executable file");
if (corefile == NULL) {
(void)snprintf(fname, sizeof(fname), "core.%d", pid);
corefile = fname;
return (1);
}
fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
if (fd < 0)
err(1, "%s", corefile);
if (sflag) {
signal(SIGHUP, killed);
signal(SIGINT, killed);
signal(SIGTERM, killed);
if (kill(pid, SIGSTOP) == -1)
err(1, "%d: stop signal", pid);
atexit(restart_target);
}
if (is_aout)
core(efd, fd, ki);
else
elf_coredump(fd, pid);
(void)close(fd);
exit(0);
return (0);
}
/*
@ -218,10 +143,7 @@ main(argc, argv)
* Build the core file.
*/
void
core(efd, fd, ki)
int efd;
int fd;
struct kinfo_proc *ki;
aoutcore(int efd, int fd, pid_t pid)
{
union {
struct user user;
@ -265,20 +187,12 @@ core(efd, fd, ki)
/* Dump stack segment */
userdump(fd, ki, USRSTACK - ctob(ssize), ssize);
/* Dump machine dependent portions of the core. */
md_core(kd, fd, ki);
}
void
datadump(efd, fd, kp, addr, npage)
register int efd;
register int fd;
struct kinfo_proc *kp;
register u_long addr;
register int npage;
datadump(int efd, int fd, struct kinfo_proc *kp, u_long addr, int npage)
{
register int cc, delta;
int cc, delta;
char buffer[PAGE_SIZE];
delta = data_offset - addr;
@ -304,29 +218,10 @@ datadump(efd, fd, kp, addr, npage)
}
}
static void
killed(sig)
int sig;
{
restart_target();
signal(sig, SIG_DFL);
kill(getpid(), sig);
}
static void
restart_target()
{
kill(pid, SIGCONT);
}
void
userdump(fd, kp, addr, npage)
register int fd;
struct kinfo_proc *kp;
register u_long addr;
register int npage;
userdump(int fd, struct kinfo_proc *kp, u_long addr, int npage)
{
register int cc;
int cc;
char buffer[PAGE_SIZE];
while (--npage >= 0) {
@ -342,9 +237,5 @@ userdump(fd, kp, addr, npage)
}
}
void
usage()
{
(void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
exit(1);
}
struct dumpers aoutdump = { aoutident, aoutcore };
TEXT_SET(dumpset, aoutdump);

22
usr.bin/gcore/elfcore.c
View File

@ -29,6 +29,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/procfs.h>
#include <sys/linker_set.h>
#include <machine/elf.h>
#include <vm/vm_param.h>
#include <vm/vm.h>
@ -77,11 +78,26 @@ static void freemap(vm_map_entry_t);
static void readhdrinfo(pid_t, prstatus_t *, prfpregset_t *, prpsinfo_t *);
static vm_map_entry_t readmap(pid_t);
static int
elf_ident(int efd, pid_t pid, char *binfile)
{
Elf_Ehdr hdr;
int cnt;
uid_t uid;
cnt = read(efd, &hdr, sizeof(hdr));
if (cnt != sizeof(hdr))
return (0);
if (IS_ELF(hdr))
return (1);
return (0);
}
/*
* Write an ELF coredump for the given pid to the given fd.
*/
void
elf_coredump(int fd, pid_t pid)
elf_coredump(int efd, int fd, pid_t pid)
{
vm_map_entry_t map;
struct sseg_closure seginfo;
@ -357,6 +373,7 @@ elf_putnote(void *dst, size_t *off, const char *name, int type,
static void
freemap(vm_map_entry_t map)
{
while (map != NULL) {
vm_map_entry_t next = map->next;
free(map);
@ -514,3 +531,6 @@ readmap(pid_t pid)
free(mapbuf);
return map;
}
struct dumpers elfdump = { elf_ident, elf_coredump };
TEXT_SET(dumpset, elfdump);

10
usr.bin/gcore/extern.h
View File

@ -34,9 +34,7 @@
* $FreeBSD$
*/
#include <sys/types.h>
#include <kvm.h>
void err(int, const char *, ...);
void elf_coredump(int, pid_t);
void md_core(kvm_t *, int, struct kinfo_proc *);
struct dumpers {
int (*ident)(int efd, pid_t pid, char *binfile);
void (*dump)(int efd, int fd, pid_t pid);
};

216
usr.bin/gcore/gcore.c
View File

@ -60,19 +60,10 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/sysctl.h>
#include <sys/linker_set.h>
#include <arpa/inet.h>
#include <machine/elf.h>
#include <machine/vmparam.h>
#include <a.out.h>
#include <err.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
@ -81,30 +72,21 @@ __FBSDID("$FreeBSD$");
#include "extern.h"
static void core(int, int, struct kinfo_proc *);
static void datadump(int, int, struct kinfo_proc *, u_long, int);
static void killed(int);
static void restart_target(void);
static void usage(void) __dead2;
static void userdump(int, struct kinfo_proc *, u_long, int);
kvm_t *kd;
static int data_offset;
static pid_t pid;
SET_DECLARE(dumpset, struct dumpers);
int
main(argc, argv)
int argc;
char *argv[];
main(int argc, char *argv[])
{
struct kinfo_proc *ki = NULL;
struct exec exec;
int ch, cnt, efd, fd, sflag;
uid_t uid;
char *binfile, *corefile;
char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN];
int is_aout;
char fname[MAXPATHLEN];
struct dumpers **d, *dumper;
sflag = 0;
corefile = NULL;
@ -123,7 +105,6 @@ main(argc, argv)
}
argv += optind;
argc -= optind;
/* XXX we should check that the pid argument is really a number */
switch (argc) {
case 1:
@ -139,54 +120,20 @@ main(argc, argv)
default:
usage();
}
efd = open(binfile, O_RDONLY, 0);
if (efd < 0)
err(1, "%s", binfile);
cnt = read(efd, &exec, sizeof(exec));
if (cnt != sizeof(exec))
errx(1, "%s exec header: %s",
binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
if (!N_BADMAG(exec)) {
is_aout = 1;
/*
* This legacy a.out support uses the kvm interface instead
* of procfs.
*/
kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
if (kd == NULL)
errx(1, "%s", errbuf);
uid = getuid();
ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
if (ki == NULL || cnt != 1)
errx(1, "%d: not found", pid);
if (ki->ki_ruid != uid && uid != 0)
errx(1, "%d: not owner", pid);
if (ki->ki_stat == SZOMB)
errx(1, "%d: zombie", pid);
if (ki->ki_flag & P_WEXIT)
errx(1, "%d: process exiting", pid);
if (ki->ki_flag & P_SYSTEM) /* Swapper or pagedaemon. */
errx(1, "%d: system process", pid);
if (exec.a_text != ptoa(ki->ki_tsize))
errx(1, "The executable %s does not belong to"
" process %d!\n"
"Text segment size (in bytes): executable %ld,"
" process %d", binfile, pid, exec.a_text,
ptoa(ki->ki_tsize));
data_offset = N_DATOFF(exec);
} else if (IS_ELF(*(Elf_Ehdr *)&exec)) {
is_aout = 0;
close(efd);
} else
dumper = NULL;
SET_FOREACH(d, dumpset) {
lseek(efd, 0, SEEK_SET);
if (((*d)->ident)(efd, pid, binfile)) {
dumper = (*d);
lseek(efd, 0, SEEK_SET);
break;
}
}
if (dumper == NULL)
errx(1, "Invalid executable file");
if (corefile == NULL) {
(void)snprintf(fname, sizeof(fname), "core.%d", pid);
corefile = fname;
@ -194,7 +141,6 @@ main(argc, argv)
fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
if (fd < 0)
err(1, "%s", corefile);
if (sflag) {
signal(SIGHUP, killed);
signal(SIGINT, killed);
@ -203,148 +149,32 @@ main(argc, argv)
err(1, "%d: stop signal", pid);
atexit(restart_target);
}
if (is_aout)
core(efd, fd, ki);
else
elf_coredump(fd, pid);
dumper->dump(efd, fd, pid);
(void)close(fd);
(void)close(efd);
exit(0);
}
/*
* core --
* Build the core file.
*/
void
core(efd, fd, ki)
int efd;
int fd;
struct kinfo_proc *ki;
{
union {
struct user user;
struct {
char uabytes[ctob(UAREA_PAGES)];
char ksbytes[ctob(KSTACK_PAGES)];
} bytes;
} uarea;
int tsize = ki->ki_tsize;
int dsize = ki->ki_dsize;
int ssize = ki->ki_ssize;
int cnt;
/* Read in user struct */
cnt = kvm_read(kd, (u_long)ki->ki_addr, uarea.bytes.uabytes,
ctob(UAREA_PAGES));
if (cnt != ctob(UAREA_PAGES))
errx(1, "read upages structure: %s",
cnt > 0 ? strerror(EIO) : strerror(errno));
cnt = kvm_read(kd, (u_long)ki->ki_kstack, uarea.bytes.ksbytes,
ctob(KSTACK_PAGES));
if (cnt != ctob(KSTACK_PAGES))
errx(1, "read kstack structure: %s",
cnt > 0 ? strerror(EIO) : strerror(errno));
/*
* Fill in the eproc vm parameters, since these are garbage unless
* the kernel is dumping core or something.
*/
uarea.user.u_kproc = *ki;
/* Dump user area */
cnt = write(fd, &uarea, sizeof(uarea));
if (cnt != sizeof(uarea))
errx(1, "write user structure: %s",
cnt > 0 ? strerror(EIO) : strerror(errno));
/* Dump data segment */
datadump(efd, fd, ki, USRTEXT + ctob(tsize), dsize);
/* Dump stack segment */
userdump(fd, ki, USRSTACK - ctob(ssize), ssize);
/* Dump machine dependent portions of the core. */
md_core(kd, fd, ki);
}
void
datadump(efd, fd, kp, addr, npage)
register int efd;
register int fd;
struct kinfo_proc *kp;
register u_long addr;
register int npage;
{
register int cc, delta;
char buffer[PAGE_SIZE];
delta = data_offset - addr;
while (--npage >= 0) {
cc = kvm_uread(kd, kp, addr, buffer, PAGE_SIZE);
if (cc != PAGE_SIZE) {
/* Try to read the page from the executable. */
if (lseek(efd, (off_t)addr + delta, SEEK_SET) == -1)
err(1, "seek executable");
cc = read(efd, buffer, sizeof(buffer));
if (cc != sizeof(buffer)) {
if (cc < 0)
err(1, "read executable");
else /* Assume untouched bss page. */
bzero(buffer, sizeof(buffer));
}
}
cc = write(fd, buffer, PAGE_SIZE);
if (cc != PAGE_SIZE)
errx(1, "write data segment: %s",
cc > 0 ? strerror(EIO) : strerror(errno));
addr += PAGE_SIZE;
}
}
static void
killed(sig)
int sig;
killed(int sig)
{
restart_target();
signal(sig, SIG_DFL);
kill(getpid(), sig);
}
static void
restart_target()
restart_target(void)
{
kill(pid, SIGCONT);
}
void
userdump(fd, kp, addr, npage)
register int fd;
struct kinfo_proc *kp;
register u_long addr;
register int npage;
usage(void)
{
register int cc;
char buffer[PAGE_SIZE];
while (--npage >= 0) {
cc = kvm_uread(kd, kp, addr, buffer, PAGE_SIZE);
if (cc != PAGE_SIZE)
/* Could be an untouched fill-with-zero page. */
bzero(buffer, PAGE_SIZE);
cc = write(fd, buffer, PAGE_SIZE);
if (cc != PAGE_SIZE)
errx(1, "write stack segment: %s",
cc > 0 ? strerror(EIO) : strerror(errno));
addr += PAGE_SIZE;
}
}
void
usage()
{
(void)fprintf(stderr, "usage: gcore [-s] [-c core] [executable] pid\n");
exit(1);
}

57
usr.bin/gcore/md-nop.c
View File

@ -1,57 +0,0 @@
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)md-nop.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/sysctl.h>
#include <stdio.h>
#include <kvm.h>
#include "extern.h"
void
md_core(kd, fd, ki)
kvm_t *kd __unused;
int fd __unused;
struct kinfo_proc *ki __unused;
{
/* Don't need to fix anything for this architecture. */
return;
}

189
usr.bin/gcore/md-sparc.c
View File

@ -1,189 +0,0 @@
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)md-sparc.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/time.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/sysctl.h>
#include <machine/vmparam.h>
#include <err.h>
#include <kvm.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include "extern.h"
#ifndef offsetof
#define offsetof(s, f) ((int)&((s *)0)->f)
#endif
static void
shift_page(fd, off, ssize)
register int fd;
register off_t off;
register int ssize;
{
char buffer[NBPG];
(void)lseek(fd, (off_t)-NBPG, SEEK_END);
for (; ssize > 0; ssize -= NBPG) {
(void)read(fd, buffer, NBPG);
(void)write(fd, buffer, NBPG);
(void)lseek(fd, (off_t)-2 * NBPG, SEEK_CUR);
}
}
/*
* Fix up the core image for the sparc. We need to flush any register
* windows that are cached in the pcb out to the user stack.
* Also, we need to get the trap frame and possible floating point state
* from the top of the kernel stack and store it in the pcb.
*/
void
md_core(kd, fd, ki)
kvm_t *kd;
int fd;
struct kinfo_proc *ki;
{
register struct rwindow *rw;
register int nsaved, cc, ssize;
register off_t off, s;
register u_long sp;
struct pcb pcb;
struct trapframe tf;
/*
* Before anything else read the trapframe. Synchronizing here
* is impossible if the process is running.
*/
cc = kvm_read(kd, (u_long)ki->kp_proc.p_md.md_tf,
/* XXX */
(void *)&tf, sizeof(tf));
if (cc < 0)
errx(1, "kvm_read: %s (reading kernel trapframe)",
kvm_geterr(kd));
if (cc != sizeof(tf))
errx(1, "cannot read kernel trapframe");
/*
* Write out the real trap frame.
*/
off = offsetof(struct user, u_md);
off += offsetof(struct md_coredump, md_tf);
if (lseek(fd, off, SEEK_SET) == -1)
err(1, "lseek");
(void)write(fd, &tf, sizeof(tf));
if (ki->kp_proc.p_md.md_fpstate != 0) {
/*
* If floating point state is present, write it out too.
* It comes right after the trapframe so we don't need to seek.
*/
struct fpstate fs;
cc = kvm_read(kd, (u_long)ki->kp_proc.p_md.md_fpstate,
(void *)&fs, sizeof(fs));
if (cc < 0)
errx(1, "kvm_read: %s (fpu state)", kvm_geterr(kd));
if (cc != sizeof(fs))
errx(1, "cannot read fpu state");
(void)write(fd, (char *)&fs, sizeof(fs));
}
/*
* Read pcb.
*/
if (lseek(fd, (off_t)offsetof(struct user, u_pcb), SEEK_SET) == -1)
err(1, "lseek");
cc = read(fd, (char *)&pcb, sizeof(pcb));
if (cc != sizeof(pcb)) {
if (cc < 0)
err(1, "read");
errx(1, "couldn't read pcb from core file");
}
/*
* Write any unsaved windows to the appropriate stack locations.
*/
nsaved = pcb.pcb_nsaved;
if (nsaved == 0)
return;
rw = &pcb.pcb_rw[0];
off = ctob(UPAGES + ki->kp_eproc.e_vm.vm_dsize);
ssize = ctob(ki->kp_eproc.e_vm.vm_ssize);
sp = tf.tf_out[6];
for (; --nsaved >= 0; ++rw) {
/*
* Copy register window into appropriate stack location.
*/
s = ssize - (USRSTACK - sp);
if (s < 0) {
if (s < -NBPG)
errx(1, "cannot copy pcb windows to stack");
/*
* It's possible to be missing the bottomost
* page because a stack page hasn't been allocated
* for the register save area. Shift over
* the stack segment by a page, and update
* the u-area to reflect the new stack size. YECH!
*/
shift_page(fd, off, ssize);
ssize += NBPG;
s += NBPG;
++ki->kp_eproc.e_vm.vm_ssize;
(void)lseek(fd,
(off_t)offsetof(struct user, u_kproc.kp_eproc.e_vm),
SEEK_SET);
(void)write(fd,
&ki->kp_eproc.e_vm, sizeof(ki->kp_eproc.e_vm));
}
if (lseek(fd, off + s, SEEK_SET) == -1)
errx(1, "cannot copy pcb windows to stack");
(void)write(fd, rw, sizeof(*rw));
sp = rw->rw_in[6];
}
}