QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
265 lines
12 KiB
265 lines
12 KiB
/*
|
|
* Test DIEBR and DIDBR instructions.
|
|
*
|
|
* Most inputs were discovered by fuzzing and exercise various corner cases in
|
|
* the helpers.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <asm/ucontext.h>
|
|
|
|
static void sigfpe_handler(int sig, siginfo_t *info, void *puc)
|
|
{
|
|
struct ucontext *uc = puc;
|
|
unsigned short *xr_insn;
|
|
int r;
|
|
|
|
xr_insn = (unsigned short *)(uc->uc_mcontext.regs.psw.addr - 6);
|
|
r = *xr_insn & 0xf;
|
|
uc->uc_mcontext.regs.gprs[r] = sig;
|
|
}
|
|
|
|
#define DIVIDE_TO_INTEGER(name, floatN) \
|
|
static inline __attribute__((__always_inline__)) int \
|
|
name(floatN *r1, floatN r2, floatN *r3, int m4, int *sig) \
|
|
{ \
|
|
int cc; \
|
|
\
|
|
asm(/* Make the initial CC predictable for suppression tests */ \
|
|
"xr %[sig],%[sig]\n" \
|
|
#name " %[r1],%[r3],%[r2],%[m4]\n" \
|
|
"ipm %[cc]\n" \
|
|
"srl %[cc],28" \
|
|
/* \
|
|
* Use earlyclobbers to prevent the compiler from reusing floating \
|
|
* point registers. This instruction doesn't like it. \
|
|
*/ \
|
|
: [r1] "+&f" (*r1), [r3] "+&f" (*r3), [sig] "=r" (*sig), [cc] "=d" (cc)\
|
|
: [r2] "f" (r2), [m4] "i" (m4) \
|
|
: "cc"); \
|
|
\
|
|
return cc; \
|
|
}
|
|
|
|
DIVIDE_TO_INTEGER(diebr, float)
|
|
DIVIDE_TO_INTEGER(didbr, double)
|
|
|
|
#define TEST_DIVIDE_TO_INTEGER(name, intN, int_fmt, floatN, float_fmt) \
|
|
static inline __attribute__((__always_inline__)) int \
|
|
test_ ## name(unsigned intN r1i, unsigned intN r2i, int m4, int fpc, \
|
|
unsigned intN r1o, unsigned intN r3o, int cco, unsigned int fpco,\
|
|
int sigo) \
|
|
{ \
|
|
union { \
|
|
floatN f; \
|
|
unsigned intN i; \
|
|
} r1, r2, r3; \
|
|
int cc, err = 0, sig; \
|
|
\
|
|
r1.i = r1i; \
|
|
r2.i = r2i; \
|
|
r3.i = 0x12345678; \
|
|
printf("[ RUN ] %" float_fmt "(0x%" int_fmt \
|
|
") / %" float_fmt "(0x%" int_fmt ")\n", r1.f, r1.i, r2.f, r2.i); \
|
|
asm volatile("sfpc %[fpc]" : : [fpc] "r" (fpc)); \
|
|
cc = name(&r1.f, r2.f, &r3.f, m4, &sig); \
|
|
asm volatile("stfpc %[fpc]" : [fpc] "=Q" (fpc)); \
|
|
if (r1.i != r1o) { \
|
|
printf("[ FAILED ] remainder 0x%" int_fmt \
|
|
" != expected 0x%" int_fmt "\n", r1.i, r1o); \
|
|
err += 1; \
|
|
} \
|
|
if (r3.i != r3o) { \
|
|
printf("[ FAILED ] quotient 0x%" int_fmt \
|
|
" != expected 0x%" int_fmt "\n", r3.i, r3o); \
|
|
err += 1; \
|
|
} \
|
|
if (cc != cco) { \
|
|
printf("[ FAILED ] cc %d != expected %d\n", cc, cco); \
|
|
err += 1; \
|
|
} \
|
|
if (fpc != fpco) { \
|
|
printf("[ FAILED ] fpc 0x%x != expected 0x%x\n", fpc, fpco); \
|
|
err += 1; \
|
|
} \
|
|
if (sig != sigo) { \
|
|
printf("[ FAILED ] signal 0x%x != expected 0x%x\n", sig, sigo); \
|
|
err += 1; \
|
|
} \
|
|
\
|
|
return err; \
|
|
}
|
|
|
|
TEST_DIVIDE_TO_INTEGER(diebr, int, "x", float, "f")
|
|
TEST_DIVIDE_TO_INTEGER(didbr, long, "lx", double, "lf")
|
|
|
|
int main(void)
|
|
{
|
|
struct sigaction act = {
|
|
.sa_sigaction = sigfpe_handler,
|
|
.sa_flags = SA_SIGINFO,
|
|
};
|
|
int err = 0;
|
|
|
|
/* Set up SIG handler */
|
|
if (sigaction(SIGFPE, &act, NULL)) {
|
|
printf("[ FAILED ] sigaction(SIGFPE) failed\n");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* 451 / 460 */
|
|
err += test_diebr(0x43e1f1f1, 0x43e61616, 7, 0,
|
|
0x43e1f1f1, 0, 0, 0, 0);
|
|
|
|
/* 480 / 0 */
|
|
err += test_diebr(0x43f00000, 0, 0, 0,
|
|
0x7fc00000, 0x7fc00000, 1, 0x800000, 0);
|
|
|
|
/* QNaN / QNaN */
|
|
err += test_diebr(0xffffffff, 0xffffffff, 0, 0,
|
|
0xffffffff, 0xffffffff, 1, 0, 0);
|
|
|
|
/* -2.08E-8 / -2.08E-8 */
|
|
err += test_diebr(0xb2b2b2b2, 0xb2b2b2b2, 0, 0,
|
|
0x80000000, 0x3f800000, 0, 0, 0);
|
|
|
|
/*
|
|
* Test partial remainder without quotient scaling (cc2).
|
|
*
|
|
* a = 12401981 / 268435456
|
|
* b = -5723991 / 72057594037927936
|
|
* q = a / b = -3329131425038336 / 5723991 =~ -581610178.1
|
|
* n = round(q, float32, nearest_even) = -581610176
|
|
* r_precise = a - b * n = 189155 / 1125899906842624
|
|
* r = round(r_precise, float32, nearest_even) = r_precise
|
|
*/
|
|
err += test_diebr(0x3d3d3d3d, 0xaeaeaeae, 0, 0,
|
|
0x2f38b8c0, 0xce0aaaab, 2, 0, 0);
|
|
|
|
/* 1.07E-31 / 2.19 */
|
|
err += test_diebr(0x0c0c0c0c, 0x400c0c0c, 6, 0,
|
|
0xc00c0c0c, 0x3f800000, 0, 0x80000, 0);
|
|
|
|
/*
|
|
* Test partial remainder with quotient scaling (cc3).
|
|
*
|
|
* a = 298343530578310714772108083200
|
|
* b = -592137/10384593717069655257060992658440192
|
|
* q = a / b
|
|
* = -1032725451057301340137043014721780674141077289604872315653324800 /
|
|
* 197379
|
|
* =~ -5232195173029052432817285601415452880707052369324357280426.6
|
|
* n = round(q, float32, nearest_even)
|
|
* = -5232194943010009439437691768433469154159343131709361094656
|
|
* n / 2^192 = -6992213 / 8388608
|
|
* r_precise = a - b * n = 13115851209189604982784
|
|
* r = round(r_precise, float32, nearest_even) = r_precise
|
|
*/
|
|
err += test_diebr(0x7070ffff, 0x90909090, 0, 0,
|
|
0x6431c0c0, 0xbf5562aa, 3, 0, 0);
|
|
|
|
/*
|
|
* Test large, but representable quotient.
|
|
*
|
|
* a = -12040119 / 549755813888
|
|
* b = 1 / 38685626227668133590597632
|
|
* q = a / b = -847248053779631702016
|
|
* n = round(q, float32, to_odd) = q
|
|
* r_precise = a - b * n = -0
|
|
* r = round(r_precise, float32, nearest_even) = -0
|
|
*/
|
|
err += test_diebr(0xb7b7b7b7, 0x15000000, 7, 0,
|
|
0x80000000, 0xe237b7b7, 0, 0, 0);
|
|
|
|
/* 0 / 0 */
|
|
err += test_diebr(0, 0, 1, 0,
|
|
0x7fc00000, 0x7fc00000, 1, 0x800000, 0);
|
|
|
|
/* 4.3E-33 / -2.08E-8 with SIGFPE */
|
|
err += test_diebr(0x09b2b2b2, 0xb2b2b2b2, 0, 0xfc000007,
|
|
0xb2b2b2b1, 0xbf800000, 0, 0xfc000807, SIGFPE);
|
|
|
|
/*
|
|
* Test tiny remainder scaling when FPC Underflow Mask is set.
|
|
*
|
|
* 1.19E-39 / -1.28E-9 = { r = 1.19E-39 * 2^192, n = -0 }
|
|
*/
|
|
err += test_diebr(0x000d0100, 0xb0b0b0b0, 6, 0xfc000000,
|
|
0x5ed01000, 0x80000000, 0, 0xfc001000, SIGFPE);
|
|
|
|
/*
|
|
* Test "inexact and incremented" DXC.
|
|
*
|
|
* a = 53555504
|
|
* b = -520849213389117849600
|
|
* q = a / b = -3347219 / 32553075836819865600
|
|
* n = round(q, float32, to_odd) = -1
|
|
* r_precise = a - b * n = -520849213389064294096
|
|
* r = round(r_precise, float32, to_odd) = -520849213389117849600
|
|
* abs(r) - abs(r_precise) = 53555504
|
|
*/
|
|
err += test_diebr(0x4c4c4c4c, 0xe1e1e1e1, 0, 0xfc000007,
|
|
0xe1e1e1e1, 0xbf800000, 0, 0xfc000c07, SIGFPE);
|
|
|
|
/* 0 / 0 with SIGFPE */
|
|
err += test_diebr(0, 0, 0, 0xfc000007,
|
|
0, 0x12345678, 0, 0xfc008007, SIGFPE);
|
|
|
|
/* 5.76E-16 / 5.39E+34 */
|
|
err += test_diebr(0x26262626, 0x79262626, 6, 0,
|
|
0xf9262626, 0x3f800000, 0, 0x80000, 0);
|
|
|
|
/* -4.97E+17 / 2.03E-38 */
|
|
err += test_diebr(0xdcdcdcdc, 0x00dcdcdc, 7, 0xfc000000,
|
|
0x80000000, 0xbb800000, 1, 0xfc000000, 0);
|
|
|
|
/* -1.23E+17 / SNaN */
|
|
err += test_diebr(0xdbdb240b, 0xffac73ff, 4, 0,
|
|
0xffec73ff, 0xffec73ff, 1, 0x800000, 0);
|
|
|
|
/* 2.34E-38 / 3.27E-33 with SIGFPE */
|
|
err += test_diebr(0x00ff0987, 0x0987c6f6, 6, 0x08000000,
|
|
0x8987c6b6, 0x3f800000, 0, 0x8000800, SIGFPE);
|
|
|
|
/* -5.93E+11 / -2.7E+4 */
|
|
err += test_diebr(0xd30a0040, 0xc6d30a00, 0, 0xc4000000,
|
|
0xc74a4400, 0x4ba766c6, 2, 0xc4000000, 0);
|
|
|
|
/* 9.86E-32 / -inf */
|
|
err += test_diebr(0x0c000029, 0xff800000, 0, 0,
|
|
0xc000029, 0x80000000, 0, 0, 0);
|
|
|
|
/* QNaN / SNaN */
|
|
err += test_diebr(0xffff94ff, 0xff94ff24, 4, 7,
|
|
0xffd4ff24, 0xffd4ff24, 1, 0x800007, 0);
|
|
|
|
/* 2.8E-43 / -inf */
|
|
err += test_diebr(0x000000c8, 0xff800000, 0, 0x7c000007,
|
|
0x000000c8, 0x80000000, 0, 0x7c000007, 0);
|
|
|
|
/* -1.7E+38 / -inf */
|
|
err += test_diebr(0xff00003d, 0xff800000, 0, 0,
|
|
0xff00003d, 0, 0, 0, 0);
|
|
|
|
/* 1.94E-304 / 1.94E-304 */
|
|
err += test_didbr(0x00e100e100e100e1, 0x00e100e100e100e1, 0, 1,
|
|
0, 0x3ff0000000000000, 0, 1, 0);
|
|
|
|
/* 4.82E-299 / 5.29E-308 */
|
|
err += test_didbr(0x0200230200230200, 0x0023020023020023, 0, 0,
|
|
0x8001a017d247b3f4, 0x41cb2aa05f000000, 0, 0, 0);
|
|
|
|
/* -1.38E-75 / -3.77E+208 */
|
|
err += test_didbr(0xb063eb3d63b063eb, 0xeb3d63b063eb3d63, 3, 0xe8000000,
|
|
0x6b3d63b063eb3d63, 0x3ff0000000000000, 0, 0xe8000c00,
|
|
SIGFPE);
|
|
|
|
/* 4.78E-299 / 6.88E-315 */
|
|
err += test_didbr(0x0200000000000000, 0x0000000053020000, 0, 0,
|
|
0x8000000020820000, 0x4338ac20dd47c6c1, 0, 0, 0);
|
|
|
|
return err ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|
|
|