x86: clear %db registers in new process
Reported by: Michał Górny <mgorny@gentoo.org> PR: 254661 Reviewed by: emaste, jhb MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D29496
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@ -229,6 +229,14 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
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copy_thread(td1, td2);
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/* Reset debug registers in the new process */
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pcb2->pcb_dr0 = 0;
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pcb2->pcb_dr1 = 0;
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pcb2->pcb_dr2 = 0;
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pcb2->pcb_dr3 = 0;
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pcb2->pcb_dr6 = 0;
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pcb2->pcb_dr7 = 0;
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/* Point mdproc and then copy over p1's contents */
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mdp2 = &p2->p_md;
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bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
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@ -241,6 +241,14 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
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copy_thread(td1, td2);
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/* Reset debug registers in the new process */
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pcb2->pcb_dr0 = 0;
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pcb2->pcb_dr1 = 0;
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pcb2->pcb_dr2 = 0;
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pcb2->pcb_dr3 = 0;
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pcb2->pcb_dr6 = 0;
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pcb2->pcb_dr7 = 0;
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/* Point mdproc and then copy over td1's contents */
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mdp2 = &p2->p_md;
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bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
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