Mega update for the KDB framework: turn DDB into a KDB backend.

Most of the changes are a direct result of adding thread awareness.
Typically, DDB_REGS is gone. All registers are taken from the
trapframe and backtraces use the PCB based contexts. DDB_REGS was
defined to be a trapframe on all platforms anyway.
Thread awareness introduces the following new commands:
	thread X	switch to thread X (where X is the TID),
	show threads	list all threads.

The backtrace code has been made more flexible so that one can
create backtraces for any thread by giving the thread ID as an
argument to trace.

With this change, ia64 has support for breakpoints.

1 files changed, 5 insertions, 12 deletions

diff --git a/sys/amd64/include/db_machdep.h b/sys/amd64/include/db_machdep.h
index 18b5e5d..0a737eb 100644
--- a/sys/amd64/include/db_machdep.h
+++ b/sys/amd64/include/db_machdep.h
@@ -30,30 +30,23 @@
 #define	_MACHINE_DB_MACHDEP_H_
 
 #include <machine/frame.h>
-#include <machine/psl.h>
 #include <machine/trap.h>
 
-#define amd64_saved_state trapframe
-
 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
 typedef	long		db_expr_t;	/* expression - signed */
 
-typedef struct amd64_saved_state db_regs_t;
-extern db_regs_t	ddb_regs;	/* register state */
-#define	DDB_REGS	(&ddb_regs)
-
-#define	PC_REGS(regs)	((db_addr_t)(regs)->tf_rip)
+#define	PC_REGS()	((db_addr_t)kdb_thrctx->pcb_rip)
 
 #define	BKPT_INST	0xcc		/* breakpoint instruction */
 #define	BKPT_SIZE	(1)		/* size of breakpoint inst */
 #define	BKPT_SET(inst)	(BKPT_INST)
 
-#define BKPT_SKIP		ddb_regs.tf_rip += 1
+#define BKPT_SKIP		kdb_frame->tf_rip += 1
 
-#define	FIXUP_PC_AFTER_BREAK	ddb_regs.tf_rip -= 1;
+#define	FIXUP_PC_AFTER_BREAK	kdb_frame->tf_rip -= 1;
 
-#define	db_clear_single_step(regs)	((regs)->tf_rflags &= ~PSL_T)
-#define	db_set_single_step(regs)	((regs)->tf_rflags |=  PSL_T)
+#define	db_clear_single_step	kdb_cpu_clear_singlestep
+#define	db_set_single_step	kdb_cpu_set_singlestep
 
 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
 /*