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Translate between abridged and full x87 tags for compat32

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ptrace(PT_GETFPREGS).

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2017-06-24 11:38:31 +00:00
parent f7df80f4ed
commit c377ff617b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320308
1 changed files with 14 additions and 6 deletions
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20
sys/amd64/ia32/ia32_reg.c
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@ -156,7 +156,7 @@ fill_fpregs32(struct thread *td, struct fpreg32 *regs)
/* 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;
/*
* XXX for en_fip/fcs/foo/fos, check if the fxsave format
* uses the old-style layout for 32 bit user apps. If so,
@ -170,9 +170,13 @@ fill_fpregs32(struct thread *td, struct fpreg32 *regs)
/* Entry into the kernel always sets TF_HASSEGS */
penv_87->en_fos = td->td_frame->tf_ds;
/* 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_fpu->sv_fp[i].fp_acc;
if ((penv_xmm->en_tw & (1 << i)) != 0)
penv_87->en_tw &= ~(3 << i * 2);
}
return (0);
}
@ -189,15 +193,19 @@ set_fpregs32(struct thread *td, struct fpreg32 *regs)
/* 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_rip = penv_87->en_fip;
/* penv_87->en_fcs and en_fos ignored, see above */
penv_xmm->en_opcode = penv_87->en_opcode;
penv_xmm->en_rdp = penv_87->en_foo;
/* FPU registers */
for (i = 0; i < 8; ++i)
/* FPU registers and tags */
penv_xmm->en_tw = 0;
for (i = 0; i < 8; ++i) {
sv_fpu->sv_fp[i].fp_acc = sv_87->sv_ac[i];
if ((penv_87->en_tw & (3 << i * 2)) != (3 << i * 2))
penv_xmm->en_tw |= 1 << i;
}
for (i = 8; i < 16; ++i)
bzero(&sv_fpu->sv_fp[i].fp_acc, sizeof(sv_fpu->sv_fp[i].fp_acc));
fpuuserinited(td);