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Convert between abridged (from FXSAVE) and unabridged (from FSAVE)

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versions of the x87 tags.  The conversion is naive, used abridged tag
is converted to valid unabridged, without additional checks for zero
and special values.

Noted by:	bde
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2015-07-10 09:20:13 +00:00
parent bcfc2be186
commit 85237e335d
1 changed files with 13 additions and 6 deletions
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19
sys/i386/isa/npx.c
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@ -1173,16 +1173,20 @@ npx_fill_fpregs_xmm1(struct savexmm *sv_xmm, struct save87 *sv_87)
/* FPU control/status */
penv_87->en_cw = penv_xmm->en_cw;
penv_87->en_sw = penv_xmm->en_sw;
penv_87->en_tw = penv_xmm->en_tw;
penv_87->en_fip = penv_xmm->en_fip;
penv_87->en_fcs = penv_xmm->en_fcs;
penv_87->en_opcode = penv_xmm->en_opcode;
penv_87->en_foo = penv_xmm->en_foo;
penv_87->en_fos = penv_xmm->en_fos;
/* FPU registers */
for (i = 0; i < 8; ++i)
/* FPU registers and tags */
penv_87->en_tw = 0xffff;
for (i = 0; i < 8; ++i) {
sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
if ((penv_xmm->en_tw & (1 << i)) != 0)
/* zero and special are set as valid */
penv_87->en_tw &= ~(3 << i);
}
}
void
@ -1206,16 +1210,19 @@ npx_set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
/* FPU control/status */
penv_xmm->en_cw = penv_87->en_cw;
penv_xmm->en_sw = penv_87->en_sw;
penv_xmm->en_tw = penv_87->en_tw;
penv_xmm->en_fip = penv_87->en_fip;
penv_xmm->en_fcs = penv_87->en_fcs;
penv_xmm->en_opcode = penv_87->en_opcode;
penv_xmm->en_foo = penv_87->en_foo;
penv_xmm->en_fos = penv_87->en_fos;
/* FPU registers */
for (i = 0; i < 8; ++i)
/* FPU registers and tags */
penv_xmm->en_tw = 0;
for (i = 0; i < 8; ++i) {
sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
if ((penv_87->en_tw && (3 << i)) != (3 << i))
penv_xmm->en_tw |= 1 << i;
}
}
#endif /* CPU_ENABLE_SSE */