From 96cec60d956bfb27f135d4e932a1c319cbc878df Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Wed, 17 Sep 2014 01:50:05 +0200
Subject: Report DR6 to userland

* i386/i386/trap.c (user_trap): On T_DEBUG, record the content of dr6 in
PCB, and clear it.
---
 i386/i386/trap.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'i386')

diff --git a/i386/i386/trap.c b/i386/i386/trap.c
index 200cbcc..9d4d43d 100644
--- a/i386/i386/trap.c
+++ b/i386/i386/trap.c
@@ -395,6 +395,11 @@ printf("user trap %d error %d sub %08x\n", type, code, subcode);
 			return 0;
 		}
 #endif /* MACH_KDB */
+		/* Make the content of the debug status register (DR6)
+		   available to user space.  */
+		if (thread->pcb)
+		    thread->pcb->ims.ids.dr[6] = get_dr6() & 0x600F;
+		set_dr6(0);
 		exc = EXC_BREAKPOINT;
 		code = EXC_I386_SGL;
 		break;
-- 
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