525 lines
14 KiB
C
525 lines
14 KiB
C
/*
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* Portable interface to the CPU cycle counter
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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#include <string.h>
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#include "common.h"
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#include "mbedtls/platform.h"
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#if defined(MBEDTLS_TIMING_C)
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#include "mbedtls/timing.h"
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#if !defined(MBEDTLS_TIMING_ALT)
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#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
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!defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
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!defined(__HAIKU__) && !defined(__midipix__)
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#error "This module only works on Unix and Windows, see MBEDTLS_TIMING_C in config.h"
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#endif
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/* *INDENT-OFF* */
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#ifndef asm
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#define asm __asm
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#endif
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/* *INDENT-ON* */
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#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
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#include <windows.h>
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#include <process.h>
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struct _hr_time {
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LARGE_INTEGER start;
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};
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#else
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#include <unistd.h>
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#include <sys/types.h>
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#include <signal.h>
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/* time.h should be included independently of MBEDTLS_HAVE_TIME. If the
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* platform matches the ifdefs above, it will be used. */
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#include <time.h>
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#include <sys/time.h>
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struct _hr_time {
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struct timeval start;
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};
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#endif /* _WIN32 && !EFIX64 && !EFI32 */
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#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
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(defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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unsigned long tsc;
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__asm rdtsc
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__asm mov[tsc], eax
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return tsc;
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}
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#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
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( _MSC_VER && _M_IX86 ) || __WATCOMC__ */
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/* some versions of mingw-64 have 32-bit longs even on x84_64 */
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#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
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defined(__GNUC__) && (defined(__i386__) || ( \
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(defined(__amd64__) || defined(__x86_64__)) && __SIZEOF_LONG__ == 4))
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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unsigned long lo, hi;
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asm volatile ("rdtsc" : "=a" (lo), "=d" (hi));
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return lo;
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}
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#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
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__GNUC__ && __i386__ */
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#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
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defined(__GNUC__) && (defined(__amd64__) || defined(__x86_64__))
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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unsigned long lo, hi;
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asm volatile ("rdtsc" : "=a" (lo), "=d" (hi));
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return lo | (hi << 32);
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}
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#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
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__GNUC__ && ( __amd64__ || __x86_64__ ) */
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#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
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defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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unsigned long tbl, tbu0, tbu1;
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do {
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asm volatile ("mftbu %0" : "=r" (tbu0));
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asm volatile ("mftb %0" : "=r" (tbl));
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asm volatile ("mftbu %0" : "=r" (tbu1));
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} while (tbu0 != tbu1);
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return tbl;
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}
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#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
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__GNUC__ && ( __powerpc__ || __ppc__ ) */
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#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
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defined(__GNUC__) && defined(__sparc64__)
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#if defined(__OpenBSD__)
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#warning OpenBSD does not allow access to tick register using software version instead
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#else
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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unsigned long tick;
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asm volatile ("rdpr %%tick, %0;" : "=&r" (tick));
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return tick;
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}
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#endif /* __OpenBSD__ */
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#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
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__GNUC__ && __sparc64__ */
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#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
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defined(__GNUC__) && defined(__sparc__) && !defined(__sparc64__)
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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unsigned long tick;
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asm volatile (".byte 0x83, 0x41, 0x00, 0x00");
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asm volatile ("mov %%g1, %0" : "=r" (tick));
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return tick;
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}
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#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
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__GNUC__ && __sparc__ && !__sparc64__ */
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#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
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defined(__GNUC__) && defined(__alpha__)
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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unsigned long cc;
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asm volatile ("rpcc %0" : "=r" (cc));
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return cc & 0xFFFFFFFF;
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}
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#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
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__GNUC__ && __alpha__ */
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#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
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defined(__GNUC__) && defined(__ia64__)
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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unsigned long itc;
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asm volatile ("mov %0 = ar.itc" : "=r" (itc));
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return itc;
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}
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#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
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__GNUC__ && __ia64__ */
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#if !defined(HAVE_HARDCLOCK) && defined(_MSC_VER) && \
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!defined(EFIX64) && !defined(EFI32)
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#define HAVE_HARDCLOCK
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unsigned long mbedtls_timing_hardclock(void)
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{
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LARGE_INTEGER offset;
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QueryPerformanceCounter(&offset);
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return (unsigned long) (offset.QuadPart);
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}
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#endif /* !HAVE_HARDCLOCK && _MSC_VER && !EFIX64 && !EFI32 */
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#if !defined(HAVE_HARDCLOCK)
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#define HAVE_HARDCLOCK
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static int hardclock_init = 0;
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static struct timeval tv_init;
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unsigned long mbedtls_timing_hardclock(void)
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{
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struct timeval tv_cur;
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if (hardclock_init == 0) {
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gettimeofday(&tv_init, NULL);
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hardclock_init = 1;
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}
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gettimeofday(&tv_cur, NULL);
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return (tv_cur.tv_sec - tv_init.tv_sec) * 1000000U
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+ (tv_cur.tv_usec - tv_init.tv_usec);
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}
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#endif /* !HAVE_HARDCLOCK */
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volatile int mbedtls_timing_alarmed = 0;
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#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
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unsigned long mbedtls_timing_get_timer(struct mbedtls_timing_hr_time *val, int reset)
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{
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struct _hr_time t;
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if (reset) {
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QueryPerformanceCounter(&t.start);
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memcpy(val, &t, sizeof(struct _hr_time));
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return 0;
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} else {
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unsigned long delta;
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LARGE_INTEGER now, hfreq;
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/* We can't safely cast val because it may not be aligned, so use memcpy */
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memcpy(&t, val, sizeof(struct _hr_time));
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QueryPerformanceCounter(&now);
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QueryPerformanceFrequency(&hfreq);
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delta = (unsigned long) ((now.QuadPart - t.start.QuadPart) * 1000ul
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/ hfreq.QuadPart);
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return delta;
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}
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}
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/* It's OK to use a global because alarm() is supposed to be global anyway */
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static DWORD alarmMs;
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static void TimerProc(void *TimerContext)
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{
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(void) TimerContext;
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Sleep(alarmMs);
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mbedtls_timing_alarmed = 1;
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/* _endthread will be called implicitly on return
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* That ensures execution of thread function's epilogue */
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}
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void mbedtls_set_alarm(int seconds)
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{
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if (seconds == 0) {
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/* No need to create a thread for this simple case.
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* Also, this shorcut is more reliable at least on MinGW32 */
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mbedtls_timing_alarmed = 1;
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return;
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}
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mbedtls_timing_alarmed = 0;
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alarmMs = seconds * 1000;
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(void) _beginthread(TimerProc, 0, NULL);
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}
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#else /* _WIN32 && !EFIX64 && !EFI32 */
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unsigned long mbedtls_timing_get_timer(struct mbedtls_timing_hr_time *val, int reset)
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{
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struct _hr_time t;
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if (reset) {
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gettimeofday(&t.start, NULL);
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memcpy(val, &t, sizeof(struct _hr_time));
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return 0;
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} else {
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unsigned long delta;
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struct timeval now;
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/* We can't safely cast val because it may not be aligned, so use memcpy */
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memcpy(&t, val, sizeof(struct _hr_time));
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gettimeofday(&now, NULL);
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delta = (now.tv_sec - t.start.tv_sec) * 1000ul
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+ (now.tv_usec - t.start.tv_usec) / 1000;
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return delta;
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}
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}
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static void sighandler(int signum)
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{
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mbedtls_timing_alarmed = 1;
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signal(signum, sighandler);
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}
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void mbedtls_set_alarm(int seconds)
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{
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mbedtls_timing_alarmed = 0;
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signal(SIGALRM, sighandler);
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alarm(seconds);
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if (seconds == 0) {
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/* alarm(0) cancelled any previous pending alarm, but the
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handler won't fire, so raise the flag straight away. */
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mbedtls_timing_alarmed = 1;
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}
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}
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#endif /* _WIN32 && !EFIX64 && !EFI32 */
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/*
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* Set delays to watch
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*/
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void mbedtls_timing_set_delay(void *data, uint32_t int_ms, uint32_t fin_ms)
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{
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mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
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ctx->int_ms = int_ms;
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ctx->fin_ms = fin_ms;
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if (fin_ms != 0) {
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(void) mbedtls_timing_get_timer(&ctx->timer, 1);
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}
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}
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/*
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* Get number of delays expired
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*/
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int mbedtls_timing_get_delay(void *data)
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{
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mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
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unsigned long elapsed_ms;
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if (ctx->fin_ms == 0) {
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return -1;
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}
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elapsed_ms = mbedtls_timing_get_timer(&ctx->timer, 0);
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if (elapsed_ms >= ctx->fin_ms) {
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return 2;
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}
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if (elapsed_ms >= ctx->int_ms) {
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return 1;
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}
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return 0;
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}
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#endif /* !MBEDTLS_TIMING_ALT */
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#if defined(MBEDTLS_SELF_TEST)
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/*
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* Busy-waits for the given number of milliseconds.
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* Used for testing mbedtls_timing_hardclock.
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*/
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static void busy_msleep(unsigned long msec)
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{
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struct mbedtls_timing_hr_time hires;
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unsigned long i = 0; /* for busy-waiting */
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volatile unsigned long j; /* to prevent optimisation */
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(void) mbedtls_timing_get_timer(&hires, 1);
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while (mbedtls_timing_get_timer(&hires, 0) < msec) {
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i++;
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}
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j = i;
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(void) j;
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}
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#define FAIL do \
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{ \
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if (verbose != 0) \
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{ \
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mbedtls_printf("failed at line %d\n", __LINE__); \
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mbedtls_printf(" cycles=%lu ratio=%lu millisecs=%lu secs=%lu hardfail=%d a=%lu b=%lu\n", \
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cycles, ratio, millisecs, secs, hardfail, \
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(unsigned long) a, (unsigned long) b); \
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mbedtls_printf(" elapsed(hires)=%lu status(ctx)=%d\n", \
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mbedtls_timing_get_timer(&hires, 0), \
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mbedtls_timing_get_delay(&ctx)); \
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} \
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return 1; \
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} while (0)
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/*
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* Checkup routine
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*
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* Warning: this is work in progress, some tests may not be reliable enough
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* yet! False positives may happen.
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*/
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int mbedtls_timing_self_test(int verbose)
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{
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unsigned long cycles = 0, ratio = 0;
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unsigned long millisecs = 0, secs = 0;
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int hardfail = 0;
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struct mbedtls_timing_hr_time hires;
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uint32_t a = 0, b = 0;
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mbedtls_timing_delay_context ctx;
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memset(&ctx, 0, sizeof(ctx));
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if (verbose != 0) {
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mbedtls_printf(" TIMING tests note: will take some time!\n");
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}
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if (verbose != 0) {
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mbedtls_printf(" TIMING test #1 (set_alarm / get_timer): ");
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}
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{
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secs = 1;
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(void) mbedtls_timing_get_timer(&hires, 1);
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mbedtls_set_alarm((int) secs);
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while (!mbedtls_timing_alarmed) {
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;
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}
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millisecs = mbedtls_timing_get_timer(&hires, 0);
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/* For some reason on Windows it looks like alarm has an extra delay
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* (maybe related to creating a new thread). Allow some room here. */
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if (millisecs < 800 * secs || millisecs > 1200 * secs + 300) {
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FAIL;
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}
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}
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if (verbose != 0) {
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mbedtls_printf("passed\n");
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}
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if (verbose != 0) {
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mbedtls_printf(" TIMING test #2 (set/get_delay ): ");
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}
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{
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a = 800;
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b = 400;
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mbedtls_timing_set_delay(&ctx, a, a + b); /* T = 0 */
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busy_msleep(a - a / 4); /* T = a - a/4 */
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if (mbedtls_timing_get_delay(&ctx) != 0) {
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FAIL;
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}
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busy_msleep(a / 4 + b / 4); /* T = a + b/4 */
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if (mbedtls_timing_get_delay(&ctx) != 1) {
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FAIL;
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}
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busy_msleep(b); /* T = a + b + b/4 */
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if (mbedtls_timing_get_delay(&ctx) != 2) {
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FAIL;
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}
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}
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mbedtls_timing_set_delay(&ctx, 0, 0);
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busy_msleep(200);
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if (mbedtls_timing_get_delay(&ctx) != -1) {
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FAIL;
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}
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if (verbose != 0) {
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mbedtls_printf("passed\n");
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}
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if (verbose != 0) {
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mbedtls_printf(" TIMING test #3 (hardclock / get_timer): ");
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}
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/*
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* Allow one failure for possible counter wrapping.
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* On a 4Ghz 32-bit machine the cycle counter wraps about once per second;
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* since the whole test is about 10ms, it shouldn't happen twice in a row.
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*/
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hard_test:
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if (hardfail > 1) {
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if (verbose != 0) {
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mbedtls_printf("failed (ignored)\n");
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}
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goto hard_test_done;
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}
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/* Get a reference ratio cycles/ms */
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millisecs = 1;
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cycles = mbedtls_timing_hardclock();
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busy_msleep(millisecs);
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cycles = mbedtls_timing_hardclock() - cycles;
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ratio = cycles / millisecs;
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/* Check that the ratio is mostly constant */
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for (millisecs = 2; millisecs <= 4; millisecs++) {
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cycles = mbedtls_timing_hardclock();
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busy_msleep(millisecs);
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cycles = mbedtls_timing_hardclock() - cycles;
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/* Allow variation up to 20% */
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if (cycles / millisecs < ratio - ratio / 5 ||
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cycles / millisecs > ratio + ratio / 5) {
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hardfail++;
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goto hard_test;
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}
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}
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if (verbose != 0) {
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mbedtls_printf("passed\n");
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}
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hard_test_done:
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if (verbose != 0) {
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mbedtls_printf("\n");
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}
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return 0;
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}
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#endif /* MBEDTLS_SELF_TEST */
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#endif /* MBEDTLS_TIMING_C */
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