Release 4.7 tools/testing/selftests/x86/test_FCOMI.c

#undef _GNU_SOURCE

#define _GNU_SOURCE 1

#undef __USE_GNU

#define __USE_GNU 1
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <fenv.h>

enum {
	
CF = 1 << 0,
	
PF = 1 << 2,
	
ZF = 1 << 6,
	
ARITH = CF | PF | ZF,
};


long res_fcomi_pi_1;

long res_fcomi_1_pi;

long res_fcomi_1_1;

long res_fcomi_nan_1;
/* sNaN is s|111 1111 1|1xx xxxx xxxx xxxx xxxx xxxx */
/* qNaN is s|111 1111 1|0xx xxxx xxxx xxxx xxxx xxxx (some x must be nonzero) */

int snan = 0x7fc11111;

int qnan = 0x7f811111;

unsigned short snan1[5];
/* sNaN80 is s|111 1111 1111 1111 |10xx xx...xx (some x must be nonzero) */

unsigned short snan80[5] = { 0x1111, 0x1111, 0x1111, 0x8111, 0x7fff };



int test(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"

        "       push    %0""\n"
        "       popf""\n"
        "       fld1""\n"
        "       fldpi""\n"
        "       fcomi   %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       ffree   %%st(1)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_1_pi""\n"

        "       push    %0""\n"
        "       popf""\n"
        "       fldpi""\n"
        "       fld1""\n"
        "       fcomi   %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       ffree   %%st(1)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_pi_1""\n"

        "       push    %0""\n"
        "       popf""\n"
        "       fld1""\n"
        "       fld1""\n"
        "       fcomi   %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       ffree   %%st(1)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_1_1""\n"
        :
        : "r" (flags)
        );
	if ((res_fcomi_1_pi & ARITH) != (0)) {
		printf("[BAD]\tfcomi_1_pi with flags:%lx\n", flags);
		return 1;
	}
	if ((res_fcomi_pi_1 & ARITH) != (CF)) {
		printf("[BAD]\tfcomi_pi_1 with flags:%lx->%lx\n", flags, res_fcomi_pi_1 & ARITH);
		return 1;
	}
	if ((res_fcomi_1_1 & ARITH) != (ZF)) {
		printf("[BAD]\tfcomi_1_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != 0) {
		printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
		return 1;
	}
	return 0;
}

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int test_qnan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
        "       push    %0""\n"
        "       popf""\n"
        "       flds    qnan""\n"
        "       fld1""\n"
        "       fnclex""\n"		// fld of a qnan raised FE_INVALID, clear it
	"       fcomi   %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       ffree   %%st(1)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_nan_1""\n"
        :
        : "r" (flags)
        );
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != FE_INVALID) {
		printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
		return 1;
	}
	return 0;
}

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int testu_qnan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
        "       push    %0""\n"
        "       popf""\n"
        "       flds    qnan""\n"
        "       fld1""\n"
        "       fnclex""\n"		// fld of a qnan raised FE_INVALID, clear it
	"       fucomi  %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       ffree   %%st(1)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_nan_1""\n"
        :
        : "r" (flags)
        );
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != 0) {
		printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
		return 1;
	}
	return 0;
}

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int testu_snan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
        "       push    %0""\n"
        "       popf""\n"
//      "       flds    snan""\n"       // WRONG, this will convert 32-bit fp snan to a *qnan* in 80-bit fp register!
//      "       fstpt   snan1""\n"      // if uncommented, it prints "snan1:7fff c111 1100 0000 0000" - c111, not 8111!
//      "       fnclex""\n"             // flds of a snan raised FE_INVALID, clear it
	"       fldt    snan80""\n"	// fldt never raise FE_INVALID
	"       fld1""\n"
        "       fucomi  %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       ffree   %%st(1)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_nan_1""\n"
        :
        : "r" (flags)
        );
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
//      printf("snan:%x snan1:%04x %04x %04x %04x %04x\n", snan, snan1[4], snan1[3], snan1[2], snan1[1], snan1[0]);
	if (fetestexcept(FE_INVALID) != FE_INVALID) {
		printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
		return 1;
	}
	return 0;
}

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int testp(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"

        "       push    %0""\n"
        "       popf""\n"
        "       fld1""\n"
        "       fldpi""\n"
        "       fcomip  %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_1_pi""\n"

        "       push    %0""\n"
        "       popf""\n"
        "       fldpi""\n"
        "       fld1""\n"
        "       fcomip  %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_pi_1""\n"

        "       push    %0""\n"
        "       popf""\n"
        "       fld1""\n"
        "       fld1""\n"
        "       fcomip  %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_1_1""\n"
        :
        : "r" (flags)
        );
	if ((res_fcomi_1_pi & ARITH) != (0)) {
		printf("[BAD]\tfcomi_1_pi with flags:%lx\n", flags);
		return 1;
	}
	if ((res_fcomi_pi_1 & ARITH) != (CF)) {
		printf("[BAD]\tfcomi_pi_1 with flags:%lx->%lx\n", flags, res_fcomi_pi_1 & ARITH);
		return 1;
	}
	if ((res_fcomi_1_1 & ARITH) != (ZF)) {
		printf("[BAD]\tfcomi_1_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != 0) {
		printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
		return 1;
	}
	return 0;
}

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int testp_qnan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
        "       push    %0""\n"
        "       popf""\n"
        "       flds    qnan""\n"
        "       fld1""\n"
        "       fnclex""\n"		// fld of a qnan raised FE_INVALID, clear it
	"       fcomip  %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_nan_1""\n"
        :
        : "r" (flags)
        );
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != FE_INVALID) {
		printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
		return 1;
	}
	return 0;
}

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int testup_qnan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
        "       push    %0""\n"
        "       popf""\n"
        "       flds    qnan""\n"
        "       fld1""\n"
        "       fnclex""\n"		// fld of a qnan raised FE_INVALID, clear it
	"       fucomip %%st(1), %%st" "\n"
        "       ffree   %%st(0)" "\n"
        "       pushf""\n"
        "       pop     res_fcomi_nan_1""\n"
        :
        : "r" (flags)
        );
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != 0) {
		printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
		return 1;
	}
	return 0;
}

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void sighandler(int sig)
{
	printf("[FAIL]\tGot signal %d, exiting\n", sig);
	exit(1);
}

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int main(int argc, char **argv, char **envp)
{
	int err = 0;

	/* SIGILL triggers on 32-bit kernels w/o fcomi emulation
         * when run with "no387 nofxsr". Other signals are caught
         * just in case.
         */
	signal(SIGILL, sighandler);
	signal(SIGFPE, sighandler);
	signal(SIGSEGV, sighandler);

	printf("[RUN]\tTesting f[u]comi[p] instructions\n");
	err |= test(0);
	err |= test_qnan(0);
	err |= testu_qnan(0);
	err |= testu_snan(0);
	err |= test(CF|ZF|PF);
	err |= test_qnan(CF|ZF|PF);
	err |= testu_qnan(CF|ZF|PF);
	err |= testu_snan(CF|ZF|PF);
	err |= testp(0);
	err |= testp_qnan(0);
	err |= testup_qnan(0);
	err |= testp(CF|ZF|PF);
	err |= testp_qnan(CF|ZF|PF);
	err |= testup_qnan(CF|ZF|PF);
	if (!err)
		printf("[OK]\tf[u]comi[p]\n");
	else
		printf("[FAIL]\tf[u]comi[p] errors: %d\n", err);

	return err;
}
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Directory: tools/testing/selftests/x86

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