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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103// SPDX-License-Identifier: GPL-2.0-only/* * tools/testing/selftests/kvm/lib/assert.c * * Copyright (C) 2018, Google LLC. */#include "test_util.h"
#include <sys/syscall.h>
#include "kselftest.h"
#ifdef __GLIBC__#include <execinfo.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/$PPID/exe -fpai {backtrace addresses} | \ * cat -n 1>&2 * * Note that the spacing is different and there's no newline. */ size_t i; size_t n = 20; void *stack[n]; const char *addr2line = "addr2line -s -e /proc/$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 = cmd;
n = backtrace(stack, n); /* * Skip the first 2 frames, which should be test_dump_stack() and * test_assert(); both of which are declared noinline. Bail if the * resulting stack trace would be empty. Otherwise, addr2line will block * waiting for addresses to be passed in via stdin. */ if (n <= 2) { fputs(" (stack trace empty)\n", stderr); return; }
c += sprintf(c, "%s", addr2line); 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}#elsestatic void test_dump_stack(void) {}#endif
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 errno=%d - %s\n", file, line, exp_str, getpid(), _gettid(), errno, 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;}