svn commit: r366798 - head/sys/kern

[Bjoern A. Zeeb]

Author: bz
Date: Sat Oct 17 22:47:08 2020
New Revision: 366798
URL: https://svnweb.freebsd.org/changeset/base/366798

Log:
  ddb: add show sysinit command
  
  Add a show sysinit command to ddb (similar to show vnet_sysinit) which
  proved to be helpful to debug some ordering issues on early-mid kernel
  start panics.

Modified:
  head/sys/kern/init_main.c

Modified: head/sys/kern/init_main.c
==============================================================================
--- head/sys/kern/init_main.c   Sat Oct 17 21:30:46 2020        (r366797)
+++ head/sys/kern/init_main.c   Sat Oct 17 22:47:08 2020        (r366798)
@@ -47,6 +47,7 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_ddb.h"
+#include "opt_kdb.h"
 #include "opt_init_path.h"
 #include "opt_verbose_sysinit.h"
 
@@ -838,3 +839,51 @@ kick_init(const void *udata __unused)
        sched_add(td, SRQ_BORING);
 }
 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
+
+/*
+ * DDB(4).
+ */
+#ifdef DDB
+static void
+db_show_print_syinit(struct sysinit *sip, bool ddb)
+{
+       const char *sname, *funcname;
+       c_db_sym_t sym;
+       db_expr_t  offset;
+
+#define xprint(...)                                                    \
+       if (ddb)                                                        \
+               db_printf(__VA_ARGS__);                                 \
+       else                                                            \
+               printf(__VA_ARGS__)
+
+       if (sip == NULL) {
+               xprint("%s: no sysinit * given\n", __func__);
+               return;
+       }
+
+       sym = db_search_symbol((vm_offset_t)sip, DB_STGY_ANY, &offset);
+       db_symbol_values(sym, &sname, NULL);
+       sym = db_search_symbol((vm_offset_t)sip->func, DB_STGY_PROC, &offset);
+       db_symbol_values(sym, &funcname, NULL);
+       xprint("%s(%p)\n", (sname != NULL) ? sname : "", sip);
+       xprint("  %#08x %#08x\n", sip->subsystem, sip->order);
+       xprint("  %p(%s)(%p)\n",
+           sip->func, (funcname != NULL) ? funcname : "", sip->udata);
+#undef xprint
+}
+
+DB_SHOW_COMMAND(sysinit, db_show_sysinit)
+{
+       struct sysinit **sipp;
+
+       db_printf("SYSINIT vs Name(Ptr)\n");
+       db_printf("  Subsystem  Order\n");
+       db_printf("  Function(Name)(Arg)\n");
+       for (sipp = sysinit; sipp < sysinit_end; sipp++) {
+               db_show_print_syinit(*sipp, true);
+               if (db_pager_quit)
+                       break;
+       }
+}
+#endif /* DDB */
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