On 4/6/11 5:45 AM, John Baldwin wrote:
On Tuesday, April 05, 2011 4:35:44 pm Navdeep Parhar wrote:
On Tue, Apr 5, 2011 at 1:33 PM, Julian Elischer<jul...@freebsd.org> wrote:
On 4/4/11 6:04 PM, Justin Hibbits wrote:
What does ddb do? It always seems to get this stuff correct.
ddb knows to stop when it gets to a non-kernel address, and it uses string
compares on function names to identify trap frames. For example in
sys/amd64/amd64/db_trace.c:
if (strcmp(name, "calltrap") == 0 ||
strcmp(name, "fork_trampoline") == 0 ||
strcmp(name, "nmi_calltrap") == 0 ||
strcmp(name, "Xdblfault") == 0)
frame_type = TRAP;
Hah, kgdb just needs to be updated (this is from trgt_amd64.c):
const struct frame_unwind *
kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
{
char *pname;
CORE_ADDR pc;
pc = frame_pc_unwind(next_frame);
pname = NULL;
find_pc_partial_function(pc,&pname, NULL, NULL);
if (pname == NULL)
return (NULL);
if (strcmp(pname, "calltrap") == 0 ||
strcmp(pname, "nmi_calltrap") == 0 ||
(pname[0] == 'X'&& pname[1] != '_'))
return (&kgdb_trgt_trapframe_unwind);
/* printf("%s: %lx =%s\n", __func__, pc, pname); */
return (NULL);
}
I'll give that a try
Can probably just add 'fork_trampoline' to that conditional. I think i386
needs a similar fix in kgdb. Not sure about other architectures:
Index: trgt_amd64.c
===================================================================
--- trgt_amd64.c (revision 220190)
+++ trgt_amd64.c (working copy)
@@ -184,6 +184,7 @@
if (pname == NULL)
return (NULL);
if (strcmp(pname, "calltrap") == 0 ||
+ strcmp(pname, "fork_trampoline") == 0 ||
strcmp(pname, "nmi_calltrap") == 0 ||
(pname[0] == 'X'&& pname[1] != '_'))
return (&kgdb_trgt_trapframe_unwind);
Index: trgt_i386.c
===================================================================
--- trgt_i386.c (revision 220190)
+++ trgt_i386.c (working copy)
@@ -374,6 +374,7 @@
if (strcmp(pname, "dblfault_handler") == 0)
return (&kgdb_trgt_dblfault_unwind);
if (strcmp(pname, "calltrap") == 0 ||
+ strcmp(pname, "fork_trampoline") == 0 ||
(pname[0] == 'X'&& pname[1] != '_'))
return (&kgdb_trgt_trapframe_unwind);
/* printf("%s: %llx =%s\n", __func__, pc, pname); */
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