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Code Issues Releases Activity

Reset the hardware debug registers when exec'ing a new image.

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Reviewed by:	bde,jlemon
Approved by:	jkh
This commit is contained in:
Brian S. Dean 2000-02-28 19:48:51 +00:00
parent b3f1e629e9
commit 2265d5e30d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=57571
2 changed files with 44 additions and 0 deletions
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22
sys/amd64/amd64/machdep.c
View File

@ -1031,6 +1031,28 @@ setregs(p, entry, stack, ps_strings)
else
pcb->pcb_gs = _udatasel;
/*
* Reset the hardware debug registers if they were in use.
* They won't have any meaning for the newly exec'd process.
*/
if (pcb->pcb_flags & PCB_DBREGS) {
pcb->pcb_dr0 = 0;
pcb->pcb_dr1 = 0;
pcb->pcb_dr2 = 0;
pcb->pcb_dr3 = 0;
pcb->pcb_dr6 = 0;
pcb->pcb_dr7 = 0;
if (pcb == curpcb) {
/*
* Clear the debug registers on the running
* CPU, otherwise they will end up affecting
* the next process we switch to.
*/
reset_dbregs();
}
pcb->pcb_flags &= ~PCB_DBREGS;
}
/*
* Initialize the math emulator (if any) for the current process.
* Actually, just clear the bit that says that the emulator has

22
sys/i386/i386/machdep.c
View File

@ -1031,6 +1031,28 @@ setregs(p, entry, stack, ps_strings)
else
pcb->pcb_gs = _udatasel;
/*
* Reset the hardware debug registers if they were in use.
* They won't have any meaning for the newly exec'd process.
*/
if (pcb->pcb_flags & PCB_DBREGS) {
pcb->pcb_dr0 = 0;
pcb->pcb_dr1 = 0;
pcb->pcb_dr2 = 0;
pcb->pcb_dr3 = 0;
pcb->pcb_dr6 = 0;
pcb->pcb_dr7 = 0;
if (pcb == curpcb) {
/*
* Clear the debug registers on the running
* CPU, otherwise they will end up affecting
* the next process we switch to.
*/
reset_dbregs();
}
pcb->pcb_flags &= ~PCB_DBREGS;
}
/*
* Initialize the math emulator (if any) for the current process.
* Actually, just clear the bit that says that the emulator has