Author: kib
Date: Tue Aug 14 12:15:01 2012
New Revision: 239252
URL: http://svn.freebsd.org/changeset/base/239252
Log:
Add a hackish debugging facility to provide a bit of information about
reason for generated trap. The dump of basic signal information and 8
bytes of the faulting instruction are printed on the controlling
terminal of the process, if the machdep.uprintf_signal syscal is
enabled.
The print is the only practical way to debug traps from a.out
processes I am aware of. Because I have to reimplement it each time I
debug an issue with a.out support on amd64, commit the hack to main
tree.
MFC after: 1 week
Modified:
head/sys/amd64/amd64/trap.c
Modified: head/sys/amd64/amd64/trap.c
==============================================================================
--- head/sys/amd64/amd64/trap.c Tue Aug 14 12:13:27 2012 (r239251)
+++ head/sys/amd64/amd64/trap.c Tue Aug 14 12:15:01 2012 (r239252)
@@ -176,9 +176,14 @@ static int panic_on_nmi = 1;
SYSCTL_INT(_machdep, OID_AUTO, panic_on_nmi, CTLFLAG_RW,
&panic_on_nmi, 0, "Panic on NMI");
TUNABLE_INT("machdep.panic_on_nmi", &panic_on_nmi);
-static int prot_fault_translation = 0;
+static int prot_fault_translation;
SYSCTL_INT(_machdep, OID_AUTO, prot_fault_translation, CTLFLAG_RW,
- &prot_fault_translation, 0, "Select signal to deliver on protection
fault");
+ &prot_fault_translation, 0,
+ "Select signal to deliver on protection fault");
+static int uprintf_signal;
+SYSCTL_INT(_machdep, OID_AUTO, uprintf_signal, CTLFLAG_RW,
+ &uprintf_signal, 0,
+ "Print debugging information on trap signal to ctty");
/*
* Exception, fault, and trap interface to the FreeBSD kernel.
@@ -610,6 +615,19 @@ trap(struct trapframe *frame)
ksi.ksi_code = ucode;
ksi.ksi_trapno = type;
ksi.ksi_addr = (void *)addr;
+ if (uprintf_signal) {
+ uprintf("pid %d comm %s: signal %d err %lx code %d type %d "
+ "addr 0x%lx <%02x %02x %02x %02x %02x %02x %02x %02x>\n",
+ p->p_pid, p->p_comm, i, frame->tf_err, ucode, type, addr,
+ fubyte((void *)(frame->tf_rip + 0)),
+ fubyte((void *)(frame->tf_rip + 1)),
+ fubyte((void *)(frame->tf_rip + 2)),
+ fubyte((void *)(frame->tf_rip + 3)),
+ fubyte((void *)(frame->tf_rip + 4)),
+ fubyte((void *)(frame->tf_rip + 5)),
+ fubyte((void *)(frame->tf_rip + 6)),
+ fubyte((void *)(frame->tf_rip + 7)));
+ }
trapsignal(td, &ksi);
user:
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