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CPU detection for MinGW #22

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CPU detection for MinGW #22

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d96add5
win32: skip some CPU detection on Windows with MinGW like 64-bit MSVC
illwieckz Apr 8, 2025
275fad6
win32: implement CPU detection for MinGW
illwieckz Dec 10, 2025
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51 changes: 45 additions & 6 deletions src/trusted/platform_qualify/arch/x86/vcpuid.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,15 @@ const int kMagicConst_ROUNDSS = 0xc0000000;
const int kMagicConst_POPCNT = 13;
const int kMagicConst_CRC32 = 0xb906c3ea;

#if !(NACL_WINDOWS && (NACL_BUILD_SUBARCH == 64))
#if (NACL_WINDOWS && defined(_MSC_VER) && (NACL_BUILD_SUBARCH == 64))
# define NACL_WINDOWS_MSC_64
#endif

#if (NACL_WINDOWS && !defined(_MSC_VER))
# define NACL_WINDOWS_MINGW
#endif

#if !defined(NACL_WINDOWS_MSC_64)
static int asm_HasMMX(void) {
volatile int before, after;
before = kMagicConst;
Expand Down Expand Up @@ -386,20 +394,34 @@ static int asm_HasCX8(void) {
#endif /* 0 */
#endif /* 64-bit Windows */

#if NACL_WINDOWS && (NACL_BUILD_SUBARCH == 64)
#if defined(NACL_WINDOWS_MSC_64)
static int CheckCPUFeatureDetection(NaClCPUFeaturesX86 *cpuf) {
/* Unfortunately the asm_ tests will not work on 64-bit Windows */
return 0;
}
#else
#if (NACL_LINUX || NACL_OSX)
#if (NACL_LINUX || NACL_OSX || defined(NACL_WINDOWS_MINGW))
/* Linux/MacOS signal handling code, for trapping illegal instruction faults */
static int sawbadinstruction = 0;
static struct sigaction crash_detect;
static int signum;

sigjmp_buf crash_load;
#if defined(NACL_WINDOWS_MINGW)
static PVOID crash_handler;
static jmp_buf crash_load;
#else
static struct sigaction crash_detect;
static sigjmp_buf crash_load;
#endif

#if defined(NACL_WINDOWS_MINGW)
static LONG CALLBACK handler_load(EXCEPTION_POINTERS *ep)
{
if (ep->ExceptionRecord->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION) {
longjmp(crash_load, SIGILL);
}
return EXCEPTION_CONTINUE_SEARCH;
}
#else
void handler_load(int signal_num) {
siglongjmp(crash_load, signal_num);
}
Expand Down Expand Up @@ -427,13 +449,18 @@ void all_sigs(struct sigaction *new_action,
(void) sigaction(SIGCHLD, &ign, 0);
(void) sigaction(SIGTSTP, &ign, 0);
}
#endif

static void SignalInit(void) {
sawbadinstruction = 0;
#if defined(NACL_WINDOWS_MINGW)
crash_handler = AddVectoredExceptionHandler(1, handler_load);
#else
crash_detect.sa_handler = handler_load;
sigemptyset(&crash_detect.sa_mask);
crash_detect.sa_flags = SA_RESETHAND;
all_sigs(&crash_detect, 0);
#endif
}

static void SetSawBadInst(void) {
Expand All @@ -450,7 +477,13 @@ static int SawBadInst(void) {
*/
static int DoTest(int (*thetest)(void), const char *s) {
SignalInit();
if (0 != (signum = sigsetjmp(crash_load, 1))) {

#if defined(NACL_WINDOWS_MINGW)
signum = setjmp(crash_load);
#else
signum = sigsetjmp(crash_load, 1);
#endif
if (0 != signum) {
SetSawBadInst();
if (SIGILL == signum) {
fprintf(stderr, "%s: illegal instruction\n", s);
Expand All @@ -462,10 +495,16 @@ static int DoTest(int (*thetest)(void), const char *s) {
int hasfeature = thetest();
if (hasfeature && (! SawBadInst())) {
printf("[Has %s]\n", s);
#if defined(NACL_WINDOWS_MINGW)
RemoveVectoredExceptionHandler(crash_handler);
#endif
return 0;
}
}
printf("no %s\n", s);
#if defined(NACL_WINDOWS_MINGW)
RemoveVectoredExceptionHandler(crash_handler);
#endif
return 1;
}
#elif NACL_WINDOWS
Expand Down