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/*
* xencov: handle test coverage information from Xen.
*
* Copyright (c) 2013, 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, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*/
#include <xenctrl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <err.h>
static xc_interface *gcov_xch = NULL;
static void gcov_init(void)
{
gcov_xch = xc_interface_open(NULL, NULL, 0);
if ( !gcov_xch )
err(1, "opening interface");
}
int gcov_get_info(int op, struct xen_sysctl *sys, struct xc_hypercall_buffer *ptr)
{
struct xen_sysctl_coverage_op *cov;
DECLARE_HYPERCALL_BUFFER_ARGUMENT(ptr);
memset(sys, 0, sizeof(*sys));
sys->cmd = XEN_SYSCTL_coverage_op;
cov = &sys->u.coverage_op;
cov->cmd = op;
set_xen_guest_handle(cov->u.raw_info, ptr);
return xc_sysctl(gcov_xch, sys);
}
static void gcov_read(const char *fn, int reset)
{
struct xen_sysctl sys;
uint32_t total_len;
DECLARE_HYPERCALL_BUFFER(uint8_t, p);
FILE *f;
int op = reset ? XEN_SYSCTL_COVERAGE_read_and_reset :
XEN_SYSCTL_COVERAGE_read;
/* get total length */
if ( gcov_get_info(XEN_SYSCTL_COVERAGE_get_total_size, &sys, NULL) < 0 )
err(1, "getting total length");
total_len = sys.u.coverage_op.u.total_size;
fprintf(stderr, "returned %u bytes\n", (unsigned) total_len);
/* safe check */
if ( total_len > 16u * 1024u * 1024u )
errx(1, "coverage size too big %u bytes\n", total_len);
/* allocate */
p = xc_hypercall_buffer_alloc(gcov_xch, p, total_len);
if ( p == NULL )
err(1, "allocating memory for coverage");
/* get data */
memset(p, 0, total_len);
if ( gcov_get_info(op, &sys, HYPERCALL_BUFFER(p)) < 0 )
err(1, "getting coverage information");
/* write to a file */
if ( strcmp(fn, "-") == 0 )
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 coverage to file");
if (f != stdout)
fclose(f);
xc_hypercall_buffer_free(gcov_xch, p);
}
static void gcov_reset(void)
{
struct xen_sysctl sys;
if ( gcov_get_info(XEN_SYSCTL_COVERAGE_reset, &sys, NULL) < 0 )
err(1, "resetting coverage information");
}
static void usage(int exit_code)
{
FILE *out = exit_code ? stderr : stdout;
fprintf(out, "xencov {reset|read|read-reset} [<filename>]\n"
"\treset reset information\n"
"\tread read information from xen to filename\n"
"\tread-reset read and reset 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);
gcov_init();
if ( strcmp(argv[0], "reset") == 0 )
gcov_reset();
else if ( strcmp(argv[0], "read") == 0 )
gcov_read(argc > 1 ? argv[1] : "-", 0);
else if ( strcmp(argv[0], "read-reset") == 0 )
gcov_read(argc > 1 ? argv[1] : "-", 1);
else
usage(1);
return 0;
}
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