mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2025-01-26 16:18:31 +00:00
Code Issues Releases Activity

Make the INTO instruction operational in 32bit mode.

Browse Source 
Having the IDT entry specify ring 0 DPL caused delivery of #GP instead
of #OF.

The instruction is not valid in 64bit mode, which probably explains
why the IDT entry for #OF was initially set this way.  It is
interesting to note that the BOUND instruction works with the IDT #BR
entry DPL 0, most likely CPU considers #BR from BOUND as generated by
a machine, not user.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2018-04-05 11:03:05 +00:00
parent 523bfea2a1
commit f407f5fb88
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=332060
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/amd64/amd64/machdep.c
View File

@ -1636,7 +1636,7 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
setidt(IDT_BP, pti ? &IDTVEC(bpt_pti) : &IDTVEC(bpt), SDT_SYSIGT,
SEL_UPL, 0);
setidt(IDT_OF, pti ? &IDTVEC(ofl_pti) : &IDTVEC(ofl), SDT_SYSIGT,
SEL_KPL, 0);
SEL_UPL, 0);
setidt(IDT_BR, pti ? &IDTVEC(bnd_pti) : &IDTVEC(bnd), SDT_SYSIGT,
SEL_KPL, 0);
setidt(IDT_UD, pti ? &IDTVEC(ill_pti) : &IDTVEC(ill), SDT_SYSIGT,