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/*
* xencov: extract test coverage information from Xen.
*
* Copyright (c) 2013, 2016, Citrix Systems R&D Ltd.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <xenctrl.h>
static xc_interface *xch = NULL;
int cov_sysctl(int op, struct xen_sysctl *sysctl,
struct xc_hypercall_buffer *buf, uint32_t buf_size)
{
DECLARE_HYPERCALL_BUFFER_ARGUMENT(buf);
memset(sysctl, 0, sizeof(*sysctl));
sysctl->cmd = XEN_SYSCTL_coverage_op;
sysctl->u.coverage_op.cmd = op;
sysctl->u.coverage_op.size = buf_size;
set_xen_guest_handle(sysctl->u.coverage_op.buffer, buf);
return xc_sysctl(xch, sysctl);
}
static void cov_read(const char *fn)
{
struct xen_sysctl sys;
uint32_t total_len;
DECLARE_HYPERCALL_BUFFER(uint8_t, p);
FILE *f;
if (cov_sysctl(XEN_SYSCTL_COVERAGE_get_size, &sys, NULL, 0) < 0)
err(1, "getting total length");
total_len = sys.u.coverage_op.size;
/* Shouldn't exceed a few hundred kilobytes */
if (total_len > 8u * 1024u * 1024u)
errx(1, "gcov data too big %u bytes\n", total_len);
p = xc_hypercall_buffer_alloc(xch, p, total_len);
if (!p)
err(1, "allocating buffer");
memset(p, 0, total_len);
if (cov_sysctl(XEN_SYSCTL_COVERAGE_read, &sys, HYPERCALL_BUFFER(p),
total_len) < 0)
err(1, "getting gcov data");
if (!strcmp(fn, "-"))
f = stdout;
else
f = fopen(fn, "w");
if (!f)
err(1, "opening output file");
if (fwrite(p, 1, total_len, f) != total_len)
err(1, "writing gcov data to file");
if (f != stdout)
fclose(f);
xc_hypercall_buffer_free(xch, p);
}
static void cov_reset(void)
{
struct xen_sysctl sys;
if (cov_sysctl(XEN_SYSCTL_COVERAGE_reset, &sys, NULL, 0) < 0)
err(1, "resetting gcov information");
}
static void usage(int exit_code)
{
FILE *out = exit_code ? stderr : stdout;
fprintf(out, "xencov {reset|read} [<filename>]\n"
"\treset reset information\n"
"\tread read information from xen to filename\n"
"\tfilename optional filename (default output)\n"
);
exit(exit_code);
}
int main(int argc, char **argv)
{
int opt;
while ((opt = getopt(argc, argv, "h")) != -1) {
switch (opt) {
case 'h':
usage(0);
break;
default:
usage(1);
}
}
argv += optind;
argc -= optind;
if (argc <= 0)
usage(1);
xch = xc_interface_open(NULL, NULL, 0);
if (!xch)
err(1, "opening xc interface");
if (strcmp(argv[0], "reset") == 0)
cov_reset();
else if (strcmp(argv[0], "read") == 0)
cov_read(argc > 1 ? argv[1] : "-");
else
usage(1);
xc_interface_close(xch);
return 0;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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