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Correct translations between abridged and full x87 tags.

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Reported and tested by:	karnajit wangkhem <karnajitw@gmail.com>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2017-06-17 11:25:31 +00:00
parent 5c118142b4
commit 746e20fdb1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320051
1 changed files with 8 additions and 3 deletions
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11
sys/i386/isa/npx.c
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@ -1108,7 +1108,7 @@ npx_fill_fpregs_xmm1(struct savexmm *sv_xmm, struct save87 *sv_87)
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);
penv_87->en_tw &= ~(3 << i * 2);
}
}
@ -1139,11 +1139,16 @@ npx_set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
penv_xmm->en_foo = penv_87->en_foo;
penv_xmm->en_fos = penv_87->en_fos;
/* FPU registers and tags */
/*
* FPU registers and tags.
* Abridged / Full translation (values in binary), see FXSAVE spec.
* 0 11
* 1 00, 01, 10
*/
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))
if ((penv_87->en_tw & (3 << i * 2)) != (3 << i * 2))
penv_xmm->en_tw |= 1 << i;
}
}