// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* tools/testing/selftests/kvm/lib/assert.c
|
*
|
* Copyright (C) 2018, Google LLC.
|
*/
|
|
#define _GNU_SOURCE /* for getline(3) and strchrnul(3)*/
|
|
#include "test_util.h"
|
|
#include <execinfo.h>
|
#include <sys/syscall.h>
|
|
#include "kselftest.h"
|
|
/* Dumps the current stack trace to stderr. */
|
static void __attribute__((noinline)) test_dump_stack(void);
|
static void test_dump_stack(void)
|
{
|
/*
|
* Build and run this command:
|
*
|
* addr2line -s -e /proc/$PPID/exe -fpai {backtrace addresses} | \
|
* grep -v test_dump_stack | cat -n 1>&2
|
*
|
* Note that the spacing is different and there's no newline.
|
*/
|
size_t i;
|
size_t n = 20;
|
void *stack[n];
|
const char *addr2line = "addr2line -s -e /proc/$PPID/exe -fpai";
|
const char *pipeline = "|cat -n 1>&2";
|
char cmd[strlen(addr2line) + strlen(pipeline) +
|
/* N bytes per addr * 2 digits per byte + 1 space per addr: */
|
n * (((sizeof(void *)) * 2) + 1) +
|
/* Null terminator: */
|
1];
|
char *c;
|
|
n = backtrace(stack, n);
|
c = &cmd[0];
|
c += sprintf(c, "%s", addr2line);
|
/*
|
* Skip the first 3 frames: backtrace, test_dump_stack, and
|
* test_assert. We hope that backtrace isn't inlined and the other two
|
* we've declared noinline.
|
*/
|
for (i = 2; i < n; i++)
|
c += sprintf(c, " %lx", ((unsigned long) stack[i]) - 1);
|
c += sprintf(c, "%s", pipeline);
|
#pragma GCC diagnostic push
|
#pragma GCC diagnostic ignored "-Wunused-result"
|
system(cmd);
|
#pragma GCC diagnostic pop
|
}
|
|
static pid_t _gettid(void)
|
{
|
return syscall(SYS_gettid);
|
}
|
|
void __attribute__((noinline))
|
test_assert(bool exp, const char *exp_str,
|
const char *file, unsigned int line, const char *fmt, ...)
|
{
|
va_list ap;
|
|
if (!(exp)) {
|
va_start(ap, fmt);
|
|
fprintf(stderr, "==== Test Assertion Failure ====\n"
|
" %s:%u: %s\n"
|
" pid=%d tid=%d - %s\n",
|
file, line, exp_str, getpid(), _gettid(),
|
strerror(errno));
|
test_dump_stack();
|
if (fmt) {
|
fputs(" ", stderr);
|
vfprintf(stderr, fmt, ap);
|
fputs("\n", stderr);
|
}
|
va_end(ap);
|
|
if (errno == EACCES) {
|
print_skip("Access denied - Exiting");
|
exit(KSFT_SKIP);
|
}
|
exit(254);
|
}
|
|
return;
|
}
|
