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/* $OpenBSD: fxproc0.c,v 1.1 2018/08/21 18:35:18 bluhm Exp $ */
/*
* Copyright (c) 2018 Alexander Bluhm <bluhm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <machine/fpu.h>
#include <machine/pcb.h>
#include <err.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
void __dead usage(void);
void fenv_proc(kvm_t *, unsigned long);
void __dead
usage(void)
{
fprintf(stderr, "usage: %s [-M core] [-N system]\n", getprogname());
exit(1);
}
int
main(int argc, char *argv[])
{
char errbuf[_POSIX2_LINE_MAX];
char *memf, *nlistf;
kvm_t *kd;
int ch;
struct nlist nl[] = { { .n_name = "_proc0" }, { .n_name = NULL } };
memf = nlistf = NULL;
while ((ch = getopt(argc, argv, "M:N:")) != -1) {
switch(ch) {
case 'M':
memf = optarg;
break;
case 'N':
nlistf = optarg;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc)
usage();
kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
if (kd == NULL)
errx(1, "kvm_openfiles: %s", errbuf);
if (kvm_nlist(kd, nl) == -1)
errx(1, "kvm_nlist: %s", kvm_geterr(kd));
if (nl[0].n_type == 0)
errx(1, "name '%s' has type %d", nl[0].n_name, nl[0].n_type);
fenv_proc(kd, nl[0].n_value);
if (kvm_close(kd) == -1)
errx(1, "kvm_close: %s", kvm_geterr(kd));
return 0;
}
void
fenv_proc(kvm_t *kd, unsigned long p)
{
struct proc proc;
struct user user;
struct fxsave64 *fxs = &user.u_pcb.pcb_savefpu.fp_fxsave;
size_t i;
if (kvm_read(kd, p, &proc, sizeof(proc)) == -1)
errx(1, "kvm_read proc: %s", kvm_geterr(kd));
if (kvm_read(kd, (u_long)proc.p_addr, &user, sizeof(user)) == -1)
errx(1, "kvm_read user: %s", kvm_geterr(kd));
if (fxs != &fxs->fx_fcw)
errx(1, "fxsave start %p, fx_fcw start %p",
&fxs, &fxs->fx_fcw);
printf("fcw\t%04x\n", fxs->fx_fcw);
printf("fsw\t%04x\n", fxs->fx_fsw);
printf("ftw\t%02x\n", fxs->fx_ftw);
printf("unused1\t%02x\n", fxs->fx_unused1);
printf("fop\t%04x\n", fxs->fx_fop);
printf("rip\t%016llx\n", fxs->fx_rip);
printf("rdp\t%016llx\n", fxs->fx_rdp);
printf("mxcsr\t%08x\n", fxs->fx_mxcsr);
printf("mxcsr_mask\t%08x\n", fxs->fx_mxcsr_mask);
if (&fxs->fx_mxcsr_mask + 1 != fxs->fx_st)
errx(1, "fx_mxcsr_mask end %p, fx_st start %p",
&fxs->fx_mxcsr_mask + 1, fxs->fx_st);
for (i = 0; i < nitems(fxs->fx_st); i++)
printf("st[%zu]\t%016llx:%016llx\n", i,
fxs->fx_st[i][1], fxs->fx_st[i][0]);
if (&fxs->fx_st[i] != fxs->fx_xmm)
errx(1, "fx_st end %p, fx_xmm start %p",
&fxs->fx_st[i], fxs->fx_xmm);
for (i = 0; i < nitems(fxs->fx_xmm); i++)
printf("xmm[%zu]\t%016llx:%016llx\n", i,
fxs->fx_xmm[i][1], fxs->fx_xmm[i][0]);
if (&fxs->fx_xmm[i] != fxs->fx_unused3)
errx(1, "fx_xmm end %p, fx_unused3 start %p",
&fxs->fx_xmm[i], fxs->fx_unused3);
for (i = 0; i < nitems(fxs->fx_unused3); i++)
printf("unused3[%zu]\t%02x\n", i, fxs->fx_unused3[i]);
if (&fxs->fx_unused3[i] != fxs + 1)
errx(1, "fx_unused3 end %p, fxsave end %p",
&fxs->fx_unused3[i], fxs + 1);
}
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