From bc895e1c896a888bae81392fb13b301a1c20352f Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Thu, 17 Jan 2002 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2002-01-17

---
 mtx/trap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mtx/trap.c b/mtx/trap.c
index 171a1d3941b6d63e6b18675594aecd51aa657c8c..ced86d1530e00accb1c1a0d1b4e607ae9e05f2a9 100644
--- a/mtx/trap.c
+++ b/mtx/trap.c
@@ -316,6 +316,7 @@ faultpower(Ureg *ureg, ulong addr, int read)
 		}
 		sprint(buf, "sys: trap: fault %s addr=0x%lux", read? "read" : "write", addr);
 		postnote(up, 1, buf, NDebug);
+dumpregs(ureg);
 	}
 	up->insyscall = insyscall;
 }
@@ -720,6 +721,7 @@ notify(Ureg* ur)
 		qunlock(&up->debug);
 		pexit(n->msg, n->flag!=NDebug);
 	}
+print("notify: old usp %lux\n", ur->usp);
 	sp = ur->usp & ~(BY2V-1);
 	sp -= sizeof(Ureg);
 
@@ -746,6 +748,7 @@ notify(Ureg* ur)
 	up->nnote--;
 	memmove(&up->lastnote, &up->note[0], sizeof(Note));
 	memmove(&up->note[0], &up->note[1], up->nnote*sizeof(Note));
+print("notify: usp %lux\n", ur->usp);
 
 	qunlock(&up->debug);
 	splx(s);