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Don't clobber the MXCSR when we fake FNINIT.

This commit is contained in:
thorpej 2001-08-03 01:21:34 +00:00
parent f72ee0a9c6
commit cfb1fd004d
1 changed files with 7 additions and 5 deletions
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12
sys/arch/i386/i386/process_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: process_machdep.c,v 1.36 2001/08/02 22:04:28 thorpej Exp $ */
/* $NetBSD: process_machdep.c,v 1.37 2001/08/03 01:21:34 thorpej Exp $ */
/*-
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@ -215,22 +215,24 @@ process_read_fpregs(p, regs)
npxsave();
#endif
} else {
u_short cw;
/*
* Fake a FNINIT.
* The initial control word was already set by setregs(), so
* save it temporarily.
*/
if (i386_use_fxsave) {
cw = frame->sv_xmm.sv_env.en_cw;
uint32_t mxcsr = frame->sv_xmm.sv_env.en_mxcsr;
uint16_t cw = frame->sv_xmm.sv_env.en_cw;
/* XXX Don't zero XMM regs? */
memset(&frame->sv_xmm, 0, sizeof(frame->sv_xmm));
frame->sv_xmm.sv_env.en_cw = cw;
frame->sv_xmm.sv_env.en_mxcsr = mxcsr;
frame->sv_xmm.sv_env.en_sw = 0x0000;
frame->sv_xmm.sv_env.en_tw = 0x00;
} else {
cw = frame->sv_87.sv_env.en_cw;
uint16_t cw = frame->sv_87.sv_env.en_cw;
memset(&frame->sv_87, 0, sizeof(frame->sv_87));
frame->sv_87.sv_env.en_cw = cw;
frame->sv_87.sv_env.en_sw = 0x0000;