diff options
| author | kib <kib@FreeBSD.org> | 2012-08-14 12:15:01 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2012-08-14 12:15:01 +0000 |
| commit | 92b79b92fb839b664e41c671fcfd29ebfe578dc4 (patch) | |
| tree | 080fe1902f5d341c66e9a38440d49b82b606b56e | |
| parent | 11621fbf7f3f18c2e71e0074b0e680b15336b0bf (diff) | |
| download | FreeBSD-src-92b79b92fb839b664e41c671fcfd29ebfe578dc4.zip FreeBSD-src-92b79b92fb839b664e41c671fcfd29ebfe578dc4.tar.gz | |
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
| -rw-r--r-- | sys/amd64/amd64/trap.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c index d035a7e..62533cb 100644 --- a/sys/amd64/amd64/trap.c +++ b/sys/amd64/amd64/trap.c @@ -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: |
