100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* tools/testing/selftests/kvm/lib/assert.c
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*
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* Copyright (C) 2018, Google LLC.
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*/
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#define _GNU_SOURCE /* for getline(3) and strchrnul(3)*/
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#include "test_util.h"
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#include <execinfo.h>
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#include <sys/syscall.h>
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#include "kselftest.h"
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/* Dumps the current stack trace to stderr. */
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static void __attribute__((noinline)) test_dump_stack(void);
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static void test_dump_stack(void)
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{
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/*
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* Build and run this command:
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*
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* addr2line -s -e /proc/$PPID/exe -fpai {backtrace addresses} | \
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* cat -n 1>&2
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*
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* Note that the spacing is different and there's no newline.
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*/
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size_t i;
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size_t n = 20;
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void *stack[n];
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const char *addr2line = "addr2line -s -e /proc/$PPID/exe -fpai";
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const char *pipeline = "|cat -n 1>&2";
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char cmd[strlen(addr2line) + strlen(pipeline) +
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/* N bytes per addr * 2 digits per byte + 1 space per addr: */
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n * (((sizeof(void *)) * 2) + 1) +
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/* Null terminator: */
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1];
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char *c = cmd;
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n = backtrace(stack, n);
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/*
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* Skip the first 2 frames, which should be test_dump_stack() and
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* test_assert(); both of which are declared noinline. Bail if the
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* resulting stack trace would be empty. Otherwise, addr2line will block
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* waiting for addresses to be passed in via stdin.
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*/
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if (n <= 2) {
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fputs(" (stack trace empty)\n", stderr);
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return;
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}
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c += sprintf(c, "%s", addr2line);
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for (i = 2; i < n; i++)
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c += sprintf(c, " %lx", ((unsigned long) stack[i]) - 1);
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c += sprintf(c, "%s", pipeline);
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wunused-result"
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system(cmd);
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#pragma GCC diagnostic pop
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}
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static pid_t _gettid(void)
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{
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return syscall(SYS_gettid);
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}
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void __attribute__((noinline))
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test_assert(bool exp, const char *exp_str,
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const char *file, unsigned int line, const char *fmt, ...)
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{
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va_list ap;
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if (!(exp)) {
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va_start(ap, fmt);
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fprintf(stderr, "==== Test Assertion Failure ====\n"
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" %s:%u: %s\n"
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" pid=%d tid=%d errno=%d - %s\n",
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file, line, exp_str, getpid(), _gettid(),
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errno, strerror(errno));
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test_dump_stack();
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if (fmt) {
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fputs(" ", stderr);
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vfprintf(stderr, fmt, ap);
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fputs("\n", stderr);
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}
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va_end(ap);
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if (errno == EACCES) {
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print_skip("Access denied - Exiting");
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exit(KSFT_SKIP);
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}
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exit(254);
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}
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return;
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}
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