git: 6c74b122953d - stable/13 - amd64 linux64: use x86_clear_dbregs()

[Konstantin Belousov]

The branch stable/13 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=6c74b122953d6981278c2061bc1b60d1d764c020

commit 6c74b122953d6981278c2061bc1b60d1d764c020
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-04-09 23:22:48 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-04-23 11:14:08 +0000

    amd64 linux64: use x86_clear_dbregs()
    
    (cherry picked from commit 2f1588474768f61f3a983af207e753bd0340a9e7)
---
 sys/amd64/linux/linux_sysvec.c | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/sys/amd64/linux/linux_sysvec.c b/sys/amd64/linux/linux_sysvec.c
index abc750c63682..252579a4809e 100644
--- a/sys/amd64/linux/linux_sysvec.c
+++ b/sys/amd64/linux/linux_sysvec.c
@@ -477,27 +477,7 @@ linux_exec_setregs(struct thread *td, struct image_params *imgp,
 	regs->tf_gs = _ugssel;
 	regs->tf_flags = TF_HASSEGS;
 
-	/*
-	 * 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();
-		}
-		clear_pcb_flags(pcb, PCB_DBREGS);
-	}
+	x86_clear_dbregs(pcb);
 
 	/*
 	 * Drop the FP state if we hold it, so that the process gets a