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, 16 insertions, 33 deletions

diff --git a/sys/alpha/include/db_machdep.h b/sys/alpha/include/db_machdep.h
index d2c4837..3f130ab 100644
--- a/sys/alpha/include/db_machdep.h
+++ b/sys/alpha/include/db_machdep.h
@@ -31,54 +31,40 @@
 #ifndef	_ALPHA_DB_MACHDEP_H_
 #define	_ALPHA_DB_MACHDEP_H_
 
-/*
- * Machine-dependent defines for new kernel debugger.
- */
-#ifndef KLD_MODULE
-#include "opt_ddb.h"
-#endif
-
 #include <sys/param.h>
 #include <vm/vm.h>
 #include <machine/frame.h>
 
-#define DB_NO_AOUT
+#define	DB_NO_AOUT
 
 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
 typedef	long		db_expr_t;	/* expression - signed */
 
-typedef struct trapframe db_regs_t;
-#ifdef	DDB
-extern db_regs_t	ddb_regs;	/* register state */
-#endif
-#define	DDB_REGS	(&ddb_regs)
-
-#define	PC_REGS(regs)	((db_addr_t)(regs)->tf_regs[FRAME_PC])
+#define	PC_REGS()	((db_addr_t)kdb_thrctx->pcb_context[7])
 
 #define	BKPT_INST	0x00000080	/* breakpoint instruction */
 #define	BKPT_SIZE	(4)		/* size of breakpoint inst */
 #define	BKPT_SET(inst)	(BKPT_INST)
 
-#define	FIXUP_PC_AFTER_BREAK \
-	(ddb_regs.tf_regs[FRAME_PC] -= BKPT_SIZE);
+#define	FIXUP_PC_AFTER_BREAK	(kdb_frame->tf_regs[FRAME_PC] -= BKPT_SIZE);
 
 #define	SOFTWARE_SSTEP	1		/* no hardware support */
-#define	IS_BREAKPOINT_TRAP(type, code)	((type) == ALPHA_KENTRY_IF && \
-					 (code) == ALPHA_IF_CODE_BPT)
+
+#define	IS_BREAKPOINT_TRAP(type, code)	\
+	((type) == ALPHA_KENTRY_IF && (code) == ALPHA_IF_CODE_BPT)
 #define	IS_WATCHPOINT_TRAP(type, code)	0
 
 /*
  * Functions needed for software single-stepping.
  */
-
-boolean_t	db_inst_trap_return(int inst);
-boolean_t	db_inst_return(int inst);
-boolean_t	db_inst_call(int inst);
-boolean_t	db_inst_branch(int inst);
-boolean_t	db_inst_load(int inst);
-boolean_t	db_inst_store(int inst);
-boolean_t	db_inst_unconditional_flow_transfer(int inst);
-db_addr_t	db_branch_taken(int inst, db_addr_t pc, db_regs_t *regs);
+boolean_t db_inst_trap_return(int inst);
+boolean_t db_inst_return(int inst);
+boolean_t db_inst_call(int inst);
+boolean_t db_inst_branch(int inst);
+boolean_t db_inst_load(int inst);
+boolean_t db_inst_store(int inst);
+boolean_t db_inst_unconditional_flow_transfer(int inst);
+db_addr_t db_branch_taken(int inst, db_addr_t pc);
 
 #define	inst_trap_return(ins)	db_inst_trap_return(ins)
 #define	inst_return(ins)	db_inst_return(ins)
@@ -88,15 +74,12 @@ db_addr_t	db_branch_taken(int inst, db_addr_t pc, db_regs_t *regs);
 #define	inst_store(ins)		db_inst_store(ins)
 #define	inst_unconditional_flow_transfer(ins) \
 				db_inst_unconditional_flow_transfer(ins)
-#define	branch_taken(ins, pc, regs) \
-				db_branch_taken((ins), (pc), (regs))
+#define	branch_taken(ins, pc)	db_branch_taken(ins, pc)
 
 /* No delay slots on Alpha. */
 #define	next_instr_address(v, b) ((db_addr_t) ((b) ? (v) : ((v) + 4)))
 
-u_long	db_register_value(db_regs_t *, int);
-int	kdb_trap(unsigned long, unsigned long, unsigned long,
-	    unsigned long, struct trapframe *);
+u_long db_register_value(int);
 
 /*
  * Pretty arbitrary